Merge branch 'feature/usernames'

backend/app.py

@@ -4,14 +4,21 @@ from contextlib import asynccontextmanager
 import subprocess
 import sys
 import os
-
+from constants import DATABASE_URL
 from routes import account, messaging, profile, push, webrtc
+import logging
+from models import User
+from constants import OWNER_USERNAME
+from sqlalchemy import create_engine
+from sqlalchemy.orm import sessionmaker
+
+logger = logging.getLogger("uvicorn.error")
 
 @asynccontextmanager
 async def lifespan(app: FastAPI):
     # Startup - run migration in separate process to avoid logging interference
     try:
-        print("Starting database migration check...")
+        logger.info("Starting database migration check...")
         # Run migration in a separate process
         subprocess.run(
             [
@@ -20,17 +27,33 @@ async def lifespan(app: FastAPI):
                 "import sys; sys.path.append('.'); from migration import run_migrations; run_migrations()"
             ], 
             cwd=os.path.dirname(os.path.abspath(__file__))
-            # No capture_output - let it stream to terminal in real-time
-            # No text=True - let it use the terminal's encoding
         )
     except Exception as e:
-        print(f"Failed to run database migrations: {e}")
+        logger.error(f"Failed to run database migrations: {e}")
         raise
     
+    try:
+        engine = create_engine(DATABASE_URL)
+        SessionLocal = sessionmaker(autocommit=False, autoflush=False, bind=engine)
+        
+        with SessionLocal() as db:
+            # Find the owner user
+            owner = db.query(User).filter(User.username == OWNER_USERNAME).first()
+            if owner and not owner.verified:
+                owner.verified = True
+                db.commit()
+                logger.info(f"Owner user '{OWNER_USERNAME}' has been verified")
+            elif owner and owner.verified:
+                logger.info(f"Owner user '{OWNER_USERNAME}' is already verified")
+            else:
+                logger.warning(f"Owner user '{OWNER_USERNAME}' not found")
+                
+    except Exception as e:
+        logger.error(f"Failed to ensure owner verification: {e}")
+    
     yield
     
     # Shutdown (if needed in the future)
-    # logger.info("Application shutdown")
 
 # Инициализация FastAPI
 app = FastAPI(title="FromChat", lifespan=lifespan)

backend/dependencies.py

@@ -35,4 +35,20 @@ def get_current_user(
             detail="User not found",
             headers={"WWW-Authenticate": "Bearer"},
         )
+
+    # Check if user is suspended
+    if user.suspended:
+        raise HTTPException(
+            status_code=status.HTTP_403_FORBIDDEN,
+            detail="Account suspended",
+            headers={"suspension_reason": user.suspension_reason or "No reason provided"},
+        )
+
+    # Check if user is deleted
+    if user.deleted:
+        raise HTTPException(
+            status_code=status.HTTP_403_FORBIDDEN,
+            detail="Account deleted",
+        )
+
     return user

backend/migration.py

@@ -102,6 +102,21 @@ def run_migrations():
                 logger.info(f"No new migrations needed or error creating migration: {e}")
                 pass
         
+        # Check if database is in an inconsistent state (has alembic_version but no tables)
+        engine = create_engine(DATABASE_URL)
+        with engine.connect() as connection:
+            from sqlalchemy import text, inspect
+            inspector = inspect(connection)
+            existing_tables = inspector.get_table_names()
+            
+            # Check if we have alembic_version but no actual tables
+            if 'alembic_version' in existing_tables and len(existing_tables) == 1:
+                logger.info("Database has alembic_version but no actual tables - resetting migration state...")
+                # Clear alembic_version and start fresh
+                connection.execute(text("DELETE FROM alembic_version"))
+                connection.commit()
+                logger.info("Reset migration state - will create fresh migration")
+        
         # Run the upgrade command
         logger.info("Running database migrations...")
         try:
@@ -116,6 +131,40 @@ def run_migrations():
                     from sqlalchemy import text
                     connection.execute(text("DELETE FROM alembic_version"))
                     connection.commit()
+                
+                # Set the correct revision in alembic_version table
+                current_dir = os.path.dirname(os.path.abspath(__file__))
+                versions_dir = os.path.join(current_dir, "alembic", "versions")
+                migration_files = [f for f in os.listdir(versions_dir) if f.endswith('.py') and not f.startswith('__')]
+                
+                if migration_files:
+                    # Get the latest migration file and extract its revision ID
+                    latest_migration = max(migration_files)
+                    migration_path = os.path.join(versions_dir, latest_migration)
+                    
+                    with open(migration_path, 'r') as f:
+                        content = f.read()
+                        # Extract revision ID from the file
+                        import re
+                        revision_match = re.search(r"revision: str = '([^']+)'", content)
+                        if revision_match:
+                            revision_id = revision_match.group(1)
+                            logger.info(f"Setting alembic_version to {revision_id}")
+                            connection.execute(text(f"INSERT INTO alembic_version (version_num) VALUES ('{revision_id}')"))
+                            connection.commit()
+                
+                # Try upgrade again
+                command.upgrade(alembic_cfg, "head")
+                logger.info("Database migrations completed successfully after reset.")
+            elif "no such table" in str(upgrade_error).lower():
+                logger.info("Database tables missing - resetting migration state...")
+                # Clear the alembic_version table and start fresh
+                engine = create_engine(DATABASE_URL)
+                with engine.connect() as connection:
+                    from sqlalchemy import text
+                    connection.execute(text("DELETE FROM alembic_version"))
+                    connection.commit()
+                
                 # Try upgrade again
                 command.upgrade(alembic_cfg, "head")
                 logger.info("Database migrations completed successfully after reset.")
@@ -134,19 +183,37 @@ def run_migrations():
                 connection.execute(text("DROP TABLE IF EXISTS alembic_version"))
                 connection.commit()
             
-            # Remove any existing migration files to start fresh
+            # Check if we have existing migration files
             versions_dir = os.path.join(current_dir, "alembic", "versions")
-            for file in os.listdir(versions_dir):
-                if file.endswith('.py') and not file.startswith('__'):
-                    os.remove(os.path.join(versions_dir, file))
+            migration_files = [f for f in os.listdir(versions_dir) if f.endswith('.py') and not f.startswith('__')]
             
-            # Create a completely fresh migration with full schema
-            logger.info("Creating fresh migration with complete schema...")
-            _create_complete_migration(alembic_cfg)
-            
-            # Run the migration
-            command.upgrade(alembic_cfg, "head")
-            logger.info("Automated recovery completed successfully.")
+            if migration_files:
+                # We have migration files, just fix the alembic_version table
+                logger.info("Found existing migration files, fixing alembic_version table...")
+                latest_migration = max(migration_files)
+                migration_path = os.path.join(versions_dir, latest_migration)
+                
+                with open(migration_path, 'r') as f:
+                    content = f.read()
+                    import re
+                    revision_match = re.search(r"revision: str = '([^']+)'", content)
+                    if revision_match:
+                        revision_id = revision_match.group(1)
+                        logger.info(f"Setting alembic_version to {revision_id}")
+                        connection.execute(text(f"INSERT INTO alembic_version (version_num) VALUES ('{revision_id}')"))
+                        connection.commit()
+                
+                # Try upgrade again
+                command.upgrade(alembic_cfg, "head")
+                logger.info("Automated recovery completed successfully.")
+            else:
+                # No migration files, create fresh ones
+                logger.info("No migration files found, creating fresh migration...")
+                _create_complete_migration(alembic_cfg)
+                
+                # Run the migration
+                command.upgrade(alembic_cfg, "head")
+                logger.info("Automated recovery completed successfully.")
             
         except Exception as recovery_error:
             logger.error(f"Automated recovery failed: {recovery_error}")
@@ -458,7 +525,28 @@ def _create_database_directly():
                 CONSTRAINT alembic_version_pkc PRIMARY KEY (version_num)
             )
         """))
-        connection.execute(text("INSERT OR IGNORE INTO alembic_version (version_num) VALUES ('direct_creation')"))
+        
+        # Get the correct revision ID from existing migration files
+        current_dir = os.path.dirname(os.path.abspath(__file__))
+        versions_dir = os.path.join(current_dir, "alembic", "versions")
+        migration_files = [f for f in os.listdir(versions_dir) if f.endswith('.py') and not f.startswith('__')]
+        
+        if migration_files:
+            latest_migration = max(migration_files)
+            migration_path = os.path.join(versions_dir, latest_migration)
+            
+            with open(migration_path, 'r') as f:
+                content = f.read()
+                import re
+                revision_match = re.search(r"revision: str = '([^']+)'", content)
+                if revision_match:
+                    revision_id = revision_match.group(1)
+                    connection.execute(text(f"INSERT OR IGNORE INTO alembic_version (version_num) VALUES ('{revision_id}')"))
+                else:
+                    connection.execute(text("INSERT OR IGNORE INTO alembic_version (version_num) VALUES ('direct_creation')"))
+        else:
+            connection.execute(text("INSERT OR IGNORE INTO alembic_version (version_num) VALUES ('direct_creation')"))
+        
         connection.commit()
 
 

backend/models.py

@@ -13,12 +13,17 @@ class User(Base):
 
     id = Column(Integer, primary_key=True, index=True)
     username = Column(String(50), unique=True, nullable=False, index=True)
+    display_name = Column(String(64), nullable=False)
     password_hash = Column(String(200), nullable=False)
     profile_picture = Column(String(255), nullable=True)
     bio = Column(Text, nullable=True)
     online = Column(Boolean, default=False)
     last_seen = Column(DateTime, default=datetime.now)
     created_at = Column(DateTime, default=datetime.now)
+    verified = Column(Boolean, default=False)
+    suspended = Column(Boolean, default=False)
+    suspension_reason = Column(Text, nullable=True)
+    deleted = Column(Boolean, default=False)
     messages = relationship("Message", back_populates="author", lazy="select")
 
 
@@ -149,6 +154,7 @@ class LoginRequest(BaseModel):
 
 class RegisterRequest(BaseModel):
     username: str
+    display_name: str
     password: str
     confirm_password: str
 
@@ -178,11 +184,16 @@ class PushSubscriptionRequest(BaseModel):
 class UserProfileResponse(BaseModel):
     id: int
     username: str
+    display_name: str
     profile_picture: str | None
     bio: str | None
     online: bool
-    last_seen: datetime
-    created_at: datetime
+    last_seen: datetime | None
+    created_at: datetime | None
+    verified: bool
+    suspended: bool
+    suspension_reason: str | None
+    deleted: bool
 
     class Config:
         from_attributes = True

backend/routes/account.py

@@ -6,7 +6,7 @@ from constants import OWNER_USERNAME
 from dependencies import get_current_user, get_db
 from models import LoginRequest, RegisterRequest, User, CryptoPublicKey, CryptoBackup
 from utils import create_token, get_password_hash, verify_password
-from validation import is_valid_password, is_valid_username
+from validation import is_valid_password, is_valid_username, is_valid_display_name
 
 router = APIRouter()
 
@@ -17,9 +17,14 @@ def convert_user(user: User) -> dict:
         "last_seen": user.last_seen.isoformat(),
         "online": user.online,
         "username": user.username,
+        "display_name": user.display_name,
         "profile_picture": user.profile_picture,
         "bio": user.bio,
-        "admin": user.username == OWNER_USERNAME
+        "admin": user.username == OWNER_USERNAME,
+        "verified": user.verified,
+        "suspended": user.suspended or False,
+        "suspension_reason": user.suspension_reason,
+        "deleted": user.deleted or False
     }
 
 @router.get("/check_auth")
@@ -58,6 +63,7 @@ def login(request: LoginRequest, db: Session = Depends(get_db)):
 @router.post("/register")
 def register(request: RegisterRequest, db: Session = Depends(get_db)):
     username = request.username.strip()
+    display_name = request.display_name.strip()
     password = request.password.strip()
     confirm_password = request.confirm_password.strip()
 
@@ -75,7 +81,13 @@ def register(request: RegisterRequest, db: Session = Depends(get_db)):
     if not is_valid_username(username):
         raise HTTPException(
             status_code=status.HTTP_400_BAD_REQUEST,
-            detail="Имя пользователя должно быть от 3 до 20 символов и не содержать пробелов"
+            detail="Имя пользователя должно быть от 3 до 20 символов и содержать только английские буквы, цифры, дефисы и подчеркивания"
+        )
+
+    if not is_valid_display_name(display_name):
+        raise HTTPException(
+            status_code=status.HTTP_400_BAD_REQUEST,
+            detail="Отображаемое имя должно быть от 1 до 64 символов и не может быть пустым"
         )
 
     if not is_valid_password(password):
@@ -105,11 +117,17 @@ def register(request: RegisterRequest, db: Session = Depends(get_db)):
         )
 
     hashed_password = get_password_hash(password)
+    
+    # Set verified=True for the owner (first user to register)
+    is_owner = not owner_exists and username == OWNER_USERNAME
+    
     new_user = User(
         username=username,
+        display_name=display_name,
         password_hash=hashed_password,
         online=True,
-        last_seen=datetime.now()
+        last_seen=datetime.now(),
+        verified=is_owner
     )
 
     db.add(new_user)

backend/routes/messaging.py

@@ -48,17 +48,29 @@ def convert_message(msg: Message) -> dict:
             reactions_dict[emoji]["count"] += 1
             reactions_dict[emoji]["users"].append({
                 "id": reaction.user_id,
-                "username": reaction.user.username
+                "username": reaction.user.display_name
             })
 
+    # Handle deleted users
+    if msg.author.deleted:
+        username = f"Deleted User #{msg.author.id}"
+        profile_picture = None
+        verified = False
+    else:
+        username = msg.author.display_name
+        profile_picture = msg.author.profile_picture
+        verified = msg.author.verified
+
     return {
         "id": msg.id,
+        "user_id": msg.author.id,
         "content": msg.content,
         "timestamp": msg.timestamp.isoformat(),
         "is_read": msg.is_read,
         "is_edited": msg.is_edited,
-        "username": msg.author.username,
-        "profile_picture": msg.author.profile_picture,
+        "username": username,
+        "profile_picture": profile_picture,
+        "verified": verified,
         "reply_to": convert_message(msg.reply_to) if msg.reply_to else None,
         "reactions": list(reactions_dict.values()),
         "files": [
@@ -88,9 +100,21 @@ def convert_dm_envelope(envelope: DMEnvelope) -> dict:
             reactions_dict[emoji]["count"] += 1
             reactions_dict[emoji]["users"].append({
                 "id": reaction.user_id,
-                "username": reaction.user.username
+                "username": reaction.user.display_name
             })
 
+    # Get sender info for verified status
+    from models import User
+    from dependencies import get_db
+    db = next(get_db())
+    sender = db.query(User).filter(User.id == envelope.sender_id).first()
+
+    # Handle deleted users
+    if sender and sender.deleted:
+        sender_verified = False
+    else:
+        sender_verified = sender.verified if sender else False
+
     return {
         "id": envelope.id,
         "senderId": envelope.sender_id,
@@ -101,6 +125,7 @@ def convert_dm_envelope(envelope: DMEnvelope) -> dict:
         "iv2": envelope.iv2_b64,
         "wrappedMk": envelope.wrapped_mk_b64,
         "timestamp": envelope.timestamp.isoformat(),
+        "verified": sender_verified,
         "reactions": list(reactions_dict.values()),
         "files": [
             {
@@ -1228,6 +1253,24 @@ class MessaggingSocketManager:
             if self.user_by_ws.get(websocket) == user_id:
                 await websocket.send_json(message)
 
+    async def send_suspension_to_user(self, user_id: int, reason: str):
+        """Send suspension message to user's WebSocket connections"""
+        message = {
+            "type": "suspended",
+            "data": {
+                "reason": reason
+            }
+        }
+        await self.send_to_user(user_id, message)
+
+    async def send_deletion_to_user(self, user_id: int):
+        """Send account deletion message to user's WebSocket connections"""
+        message = {
+            "type": "account_deleted",
+            "data": {}
+        }
+        await self.send_to_user(user_id, message)
+
     async def broadcast_status_change(self, user_id: int, online: bool, last_seen: str):
         """Broadcast status change to all connections that are subscribed to this user"""
         message = {

backend/routes/profile.py

@@ -3,6 +3,7 @@ import re
 from fastapi import APIRouter, Depends, HTTPException, UploadFile, File
 from fastapi.responses import FileResponse
 from sqlalchemy.orm import Session
+from sqlalchemy import inspect, text
 from PIL import Image
 import os
 import uuid
@@ -11,12 +12,16 @@ import io
 from dependencies import get_db, get_current_user
 from models import User, UpdateBioRequest, UserProfileResponse
 from pydantic import BaseModel
+from validation import is_valid_username, is_valid_display_name
+from similarity import is_user_similar_to_verified
+from messaging import messagingManager
 
 router = APIRouter()
 
 # Request models
 class UpdateProfileRequest(BaseModel):
-    nickname: str | None = None
+    username: str | None = None
+    display_name: str | None = None
     description: str | None = None
 
 # Create uploads directory if it doesn't exist
@@ -102,6 +107,7 @@ async def get_user_profile(
     return {
         "id": current_user.id,
         "username": current_user.username,
+        "display_name": current_user.display_name,
         "profile_picture": current_user.profile_picture,
         "bio": current_user.bio,
         "online": current_user.online,
@@ -121,19 +127,32 @@ async def update_user_profile(
     updated = False
     
     # Update username if provided
-    if request.nickname is not None:
-        nickname = request.nickname.strip()
-        if len(nickname) < 3:
-            raise HTTPException(status_code=400, detail="Username must be at least 3 characters long")
-        if len(nickname) > 50:
-            raise HTTPException(status_code=400, detail="Username must be 50 characters or less")
+    if request.username is not None:
+        username = request.username.strip()
+        if not is_valid_username(username):
+            raise HTTPException(
+                status_code=400, 
+                detail="Имя пользователя должно быть от 3 до 20 символов и содержать только английские буквы, цифры, дефисы и подчеркивания"
+            )
         
         # Check if username is already taken by another user
-        existing_user = db.query(User).filter(User.username == nickname, User.id != current_user.id).first()
+        existing_user = db.query(User).filter(User.username == username, User.id != current_user.id).first()
         if existing_user:
-            raise HTTPException(status_code=400, detail="Username already taken")
+            raise HTTPException(status_code=400, detail="Это имя пользователя уже занято")
         
-        current_user.username = nickname
+        current_user.username = username
+        updated = True
+    
+    # Update display name if provided
+    if request.display_name is not None:
+        display_name = request.display_name.strip()
+        if not is_valid_display_name(display_name):
+            raise HTTPException(
+                status_code=400, 
+                detail="Отображаемое имя должно быть от 1 до 64 символов и не может быть пустым"
+            )
+        
+        current_user.display_name = display_name
         updated = True
     
     # Update bio if provided
@@ -150,12 +169,14 @@ async def update_user_profile(
         return {
             "message": "Profile updated successfully",
             "username": current_user.username,
+            "display_name": current_user.display_name,
             "bio": current_user.bio
         }
     else:
         return {
             "message": "No changes made",
             "username": current_user.username,
+            "display_name": current_user.display_name,
             "bio": current_user.bio
         }
 
@@ -197,9 +218,269 @@ async def get_user_by_username(
     return UserProfileResponse(
         id=user.id,
         username=user.username,
+        display_name=user.display_name,
         profile_picture=user.profile_picture,
         bio=user.bio,
         online=user.online,
         last_seen=user.last_seen,
         created_at=user.created_at
     )
+
+@router.get("/user/id/{user_id}")
+async def get_user_by_id(
+    user_id: int,
+    db: Session = Depends(get_db)
+):
+    """
+    Get user profile by user ID
+    """
+    user = db.query(User).filter(User.id == user_id).first()
+    
+    if not user:
+        raise HTTPException(status_code=404, detail="User not found")
+    
+    # Handle deleted users
+    if user.deleted:
+        return UserProfileResponse(
+            id=user.id,
+            username="deleted",
+            display_name="Deleted User",
+            profile_picture=None,
+            bio=None,
+            online=False,
+            last_seen=None,  # Clear last seen timestamp
+            created_at=None,  # Clear member since timestamp
+            verified=False,
+            suspended=False,
+            suspension_reason=None,
+            deleted=True
+        )
+    
+    return UserProfileResponse(
+        id=user.id,
+        username=user.username,
+        display_name=user.display_name,
+        profile_picture=user.profile_picture,
+        bio=user.bio,
+        online=user.online,
+        last_seen=user.last_seen,
+        created_at=user.created_at,
+        verified=user.verified,
+        suspended=user.suspended or False,
+        suspension_reason=user.suspension_reason,
+        deleted=user.deleted or False
+    )
+
+
+@router.post("/user/{user_id}/verify")
+async def verify_user(
+    user_id: int,
+    current_user: User = Depends(get_current_user),
+    db: Session = Depends(get_db)
+):
+    """
+    Toggle verification status for a user (owner only)
+    """
+    # Only user with ID 1 (owner) can verify users
+    if current_user.id != 1:
+        raise HTTPException(status_code=403, detail="Only owner can verify users")
+    
+    target_user = db.query(User).filter(User.id == user_id).first()
+    if not target_user:
+        raise HTTPException(status_code=404, detail="User not found")
+    
+    # Toggle verification status
+    target_user.verified = not target_user.verified
+    db.commit()
+    
+    return {
+        "verified": target_user.verified,
+        "message": f"User verification {'enabled' if target_user.verified else 'disabled'}"
+    }
+
+
+@router.get("/user/check-similarity/{user_id}")
+async def check_user_similarity(
+    user_id: int,
+    current_user: User = Depends(get_current_user),
+    db: Session = Depends(get_db)
+):
+    """
+    Check if a user is similar to any verified user
+    """
+    target_user = db.query(User).filter(User.id == user_id).first()
+    if not target_user:
+        raise HTTPException(status_code=404, detail="User not found")
+    
+    # Get all verified users
+    verified_users = db.query(User).filter(User.verified == True).all()
+    verified_users_data = [
+        {"username": user.username, "display_name": user.display_name}
+        for user in verified_users
+    ]
+    
+    # Check similarity
+    is_similar, similar_to = is_user_similar_to_verified(
+        target_user.username,
+        target_user.display_name,
+        verified_users_data
+    )
+    
+    return {
+        "isSimilar": is_similar,
+        "similarTo": similar_to if is_similar else None
+    }
+
+
+# Admin endpoints for user management
+class SuspendUserRequest(BaseModel):
+    reason: str
+
+@router.post("/user/{user_id}/suspend")
+async def suspend_user(
+    user_id: int,
+    request: SuspendUserRequest,
+    current_user: User = Depends(get_current_user),
+    db: Session = Depends(get_db)
+):
+    """
+    Suspend a user account (admin only)
+    """
+    # Only user with ID 1 (admin) can suspend users
+    if current_user.id != 1:
+        raise HTTPException(status_code=403, detail="Only admin can suspend users")
+    
+    target_user = db.query(User).filter(User.id == user_id).first()
+    if not target_user:
+        raise HTTPException(status_code=404, detail="User not found")
+    
+    # Cannot suspend admin
+    if target_user.id == 1:
+        raise HTTPException(status_code=400, detail="Cannot suspend admin account")
+    
+    # Suspend the user
+    target_user.suspended = True
+    target_user.suspension_reason = request.reason
+    db.commit()
+    
+    # Send WebSocket suspension message
+    try:
+        await messagingManager.send_suspension_to_user(user_id, request.reason)
+    except Exception as e:
+        # Log error but don't fail the request
+        pass
+    
+    return {
+        "status": "success",
+        "message": f"User {target_user.username} has been suspended",
+        "reason": request.reason
+    }
+
+
+@router.post("/user/{user_id}/unsuspend")
+async def unsuspend_user(
+    user_id: int,
+    current_user: User = Depends(get_current_user),
+    db: Session = Depends(get_db)
+):
+    """
+    Unsuspend a user account (admin only)
+    """
+    # Only user with ID 1 (admin) can unsuspend users
+    if current_user.id != 1:
+        raise HTTPException(status_code=403, detail="Only admin can unsuspend users")
+    
+    target_user = db.query(User).filter(User.id == user_id).first()
+    if not target_user:
+        raise HTTPException(status_code=404, detail="User not found")
+    
+    # Unsuspend the user
+    target_user.suspended = False
+    target_user.suspension_reason = None
+    db.commit()
+    
+    return {
+        "status": "success",
+        "message": f"User {target_user.username} has been unsuspended"
+    }
+
+
+@router.post("/user/{user_id}/delete")
+async def delete_user(
+    user_id: int,
+    current_user: User = Depends(get_current_user),
+    db: Session = Depends(get_db)
+):
+    """
+    Delete a user account (admin only) - preserves messages/DMs/reactions/files
+    """
+    # Only user with ID 1 (admin) can delete users
+    if current_user.id != 1:
+        raise HTTPException(status_code=403, detail="Only admin can delete users")
+    
+    target_user = db.query(User).filter(User.id == user_id).first()
+    if not target_user:
+        raise HTTPException(status_code=404, detail="User not found")
+    
+    # Cannot delete admin
+    if target_user.id == 1:
+        raise HTTPException(status_code=400, detail="Cannot delete admin account")
+    
+    # Mark user as deleted and clear sensitive data
+    target_user.deleted = True
+    target_user.display_name = f"Deleted User #{user_id}"
+    target_user.bio = None
+    target_user.password_hash = ""
+    target_user.username = f"deleted_{user_id}"
+    target_user.profile_picture = None
+    target_user.last_seen = None  # Clear last seen timestamp
+    target_user.created_at = None  # Clear member since timestamp
+    
+    # Delete profile picture file if exists
+    if target_user.profile_picture and target_user.profile_picture.startswith("/api/profile-picture/"):
+        try:
+            import os
+            filename = target_user.profile_picture.split("/")[-1]
+            filepath = os.path.join("data/uploads/pfp", filename)
+            if os.path.exists(filepath):
+                os.remove(filepath)
+        except Exception as e:
+            # Log error but don't fail the request
+            pass
+    
+    # Dynamic deletion of all non-whitelist data
+    WHITELIST_TABLES = {"message", "dm_envelope", "reaction", "dm_reaction", "message_file", "dm_file"}
+    
+    try:
+        inspector = inspect(db.bind)
+        all_tables = inspector.get_table_names()
+        
+        for table_name in all_tables:
+            if table_name in WHITELIST_TABLES or table_name == "user":
+                continue
+            
+            # Check if table has user_id column
+            columns = inspector.get_columns(table_name)
+            has_user_id = any(col['name'] == 'user_id' for col in columns)
+            
+            if has_user_id:
+                # Delete all records for this user
+                db.execute(text(f"DELETE FROM {table_name} WHERE user_id = :uid"), {"uid": user_id})
+        
+        db.commit()
+    except Exception as e:
+        # Log error and rollback
+        db.rollback()
+        raise HTTPException(status_code=500, detail="Failed to delete user data")
+    
+    # Send WebSocket deletion message
+    try:
+        await messagingManager.send_deletion_to_user(user_id)
+    except Exception as e:
+        # Log error but don't fail the request
+        pass
+    
+    return {
+        "status": "success",
+        "message": f"User {target_user.username} has been deleted"
+    }

backend/similarity.py

@@ -0,0 +1,147 @@
+"""
+Similarity detection utilities for username and display name comparison.
+Implements both edit distance and visual similarity detection.
+"""
+
+def levenshtein_distance(s1: str, s2: str) -> int:
+    """Calculate Levenshtein distance between two strings."""
+    if len(s1) < len(s2):
+        return levenshtein_distance(s2, s1)
+
+    if len(s2) == 0:
+        return len(s1)
+
+    previous_row = list(range(len(s2) + 1))
+    for i, c1 in enumerate(s1):
+        current_row = [i + 1]
+        for j, c2 in enumerate(s2):
+            insertions = previous_row[j + 1] + 1
+            deletions = current_row[j] + 1
+            substitutions = previous_row[j] + (c1 != c2)
+            current_row.append(min(insertions, deletions, substitutions))
+        previous_row = current_row
+    
+    return previous_row[-1]
+
+
+def check_visual_similarity(s1: str, s2: str) -> bool:
+    """
+    Check if two strings are visually similar using common homoglyphs.
+    Returns True if strings are visually similar.
+    """
+    if len(s1) != len(s2):
+        return False
+    
+    # Common homoglyph mappings
+    homoglyphs = {
+        '0': ['O', 'o', 'Q'],
+        'O': ['0', 'o', 'Q'],
+        'o': ['0', 'O', 'Q'],
+        '1': ['l', 'I', '|'],
+        'l': ['1', 'I', '|'],
+        'I': ['1', 'l', '|'],
+        '5': ['S', 's'],
+        'S': ['5', 's'],
+        's': ['5', 'S'],
+        '6': ['G', 'g'],
+        'G': ['6', 'g'],
+        'g': ['6', 'G'],
+        '8': ['B', 'b'],
+        'B': ['8', 'b'],
+        'b': ['8', 'B'],
+        '9': ['g', 'q'],
+        'g': ['9', 'q'],
+        'q': ['9', 'g'],
+        '2': ['Z', 'z'],
+        'Z': ['2', 'z'],
+        'z': ['2', 'Z'],
+        '3': ['E'],
+        'E': ['3'],
+        '4': ['A'],
+        'A': ['4'],
+        '7': ['T', 't'],
+        'T': ['7', 't'],
+        't': ['7', 'T'],
+    }
+    
+    for i in range(len(s1)):
+        c1, c2 = s1[i], s2[i]
+        if c1 == c2:
+            continue
+        
+        # Check if characters are homoglyphs
+        if (c1 in homoglyphs and c2 in homoglyphs[c1]) or \
+           (c2 in homoglyphs and c1 in homoglyphs[c2]):
+            continue
+        
+        return False
+    
+    return True
+
+
+def check_username_similarity(username1: str, username2: str) -> bool:
+    """
+    Check if two usernames are similar using both edit distance and visual similarity.
+    Returns True if usernames are considered similar.
+    """
+    if username1 == username2:
+        return False
+    
+    # Check edit distance (Levenshtein distance <= 2)
+    edit_distance = levenshtein_distance(username1.lower(), username2.lower())
+    if edit_distance <= 2:
+        return True
+    
+    # Check visual similarity
+    if check_visual_similarity(username1, username2):
+        return True
+    
+    return False
+
+
+def check_display_name_similarity(display_name1: str, display_name2: str) -> bool:
+    """
+    Check if two display names are similar using both edit distance and visual similarity.
+    Returns True if display names are considered similar.
+    """
+    if display_name1 == display_name2:
+        return False
+    
+    # Check edit distance (Levenshtein distance <= 2)
+    edit_distance = levenshtein_distance(display_name1.lower(), display_name2.lower())
+    if edit_distance <= 2:
+        return True
+    
+    # Check visual similarity
+    if check_visual_similarity(display_name1, display_name2):
+        return True
+    
+    return False
+
+
+def is_user_similar_to_verified(user_username: str, user_display_name: str, 
+                               verified_users: list[dict]) -> tuple[bool, str]:
+    """
+    Check if a user is similar to any verified user.
+    
+    Args:
+        user_username: Username to check
+        user_display_name: Display name to check
+        verified_users: List of verified user dictionaries with 'username' and 'display_name' keys
+    
+    Returns:
+        Tuple of (is_similar, similar_to_username)
+    """
+    for verified_user in verified_users:
+        verified_username = verified_user.get('username', '')
+        verified_display_name = verified_user.get('display_name', '')
+        
+        # Check username similarity
+        if check_username_similarity(user_username, verified_username):
+            return True, verified_username
+        
+        # Check display name similarity
+        if check_display_name_similarity(user_display_name, verified_display_name):
+            return True, verified_username
+    
+    return False, ""

backend/validation.py

@@ -3,7 +3,17 @@ import re
 def is_valid_username(username: str) -> bool:
     if len(username) < 3 or len(username) > 20:
         return False
-    if re.search(r'[\s\u180E\u200B-\u200D\u2060\uFEFF]', username):
+    # Only allow English letters, numbers, dashes and underscores
+    if not re.match(r'^[a-zA-Z0-9_-]+$', username):
+        return False
+    return True
+
+
+def is_valid_display_name(display_name: str) -> bool:
+    if len(display_name) < 1 or len(display_name) > 64:
+        return False
+    # Check if not blank (only whitespace)
+    if not display_name.strip():
         return False
     return True
 

frontend/src/App.tsx

@@ -1,10 +1,12 @@
-import { BrowserRouter, Routes, Route } from "react-router-dom";
+import { BrowserRouter, Routes, Route, useNavigate, matchRoutes, type RouteObject } from "react-router-dom";
 import { ElectronTitleBar } from "./Electron";
 import { useAppState } from "./pages/chat/state";
-import { useEffect, useState, lazy } from "react";
-import ProtectedRoute from "./pages/ProtectedRoute";
+import { lazy, useEffect, useState } from "react";
+import { parseProfileLink } from "./core/profileLinks";
 import NotFoundPage from "./pages/not-found/NotFoundPage";
+import ProtectedRoute from "./pages/ProtectedRoute";
 import DownloadAppPage from "./pages/download-app/DownloadAppPage";
+import { SuspensionDialog } from "./pages/chat/ui/SuspensionDialog";
 
 // Lazy load route components
 const HomePage = lazy(() => import("./pages/home/HomePage"));
@@ -12,36 +14,85 @@ const LoginPage = lazy(() => import("./pages/auth/LoginPage"));
 const RegisterPage = lazy(() => import("./pages/auth/RegisterPage"));
 const ChatPage = lazy(() => import("./pages/chat/ui/ChatPage"));
 
+const routeConfig: RouteObject[] = [
+    { path: "/", element: <HomePage /> },
+    { path: "/login", element: <LoginPage /> },
+    { path: "/register", element: <RegisterPage /> },
+    { path: "/download-app", element: <DownloadAppPage /> },
+    {
+        path: "/chat",
+        element: (
+            <ProtectedRoute>
+                <ChatPage />
+            </ProtectedRoute>
+        )
+    },
+    { path: "*", element: <SmartCatchAll /> }
+];
+
+function SmartCatchAll() {
+    const navigate = useNavigate();
+    const [showNotFound, setShowNotFound] = useState(false);
+
+    function isValidRoute(path: string): boolean {
+        const validRoutes = routeConfig.filter(route => route.path !== "*");
+        const matches = matchRoutes(validRoutes, path);
+        
+        return Boolean(matches && matches.length > 0);
+    }
+
+    useEffect(() => {
+        if (isValidRoute(location.pathname)) {
+            setShowNotFound(false);
+            return;
+        }
+        
+        const profileInfo = parseProfileLink(); // No URL specified intentionally to let it use the current URL
+        
+        if (profileInfo) {
+            setShowNotFound(false);
+            navigate("/chat", { 
+                replace: true,
+                state: { profileInfo }
+            });
+        } else {
+            setShowNotFound(true);
+        }
+    }, [navigate]);
+
+    // Show 404 page
+    if (showNotFound) {
+        return <NotFoundPage />;
+    }
+}
+
 export default function App() {
-    const { restoreUserFromStorage } = useAppState();
+    const { restoreUserFromStorage, user } = useAppState();
     const [authReady, setAuthReady] = useState(false);
 
-    // Restore user from localStorage on app initialization
     useEffect(() => {
         restoreUserFromStorage().finally(() => {
             setAuthReady(true);
         });
     }, [restoreUserFromStorage]);
-
+    
     return authReady && (
         <BrowserRouter>
             <ElectronTitleBar />
             <div id="main-wrapper">
                 <Routes>
-                    <Route path="/" element={<HomePage />} />
-                    <Route path="/login" element={<LoginPage />} />
-                    <Route path="/register" element={<RegisterPage />} />
-                    <Route path="/download-app" element={<DownloadAppPage />} />
-                    <Route path="/">
-                        <Route path="chat" element={
-                            <ProtectedRoute>
-                                <ChatPage />
-                            </ProtectedRoute>
-                        } />
-                    </Route>
-                    <Route path="*" element={<NotFoundPage />} />
+                    {routeConfig.map((route, index) => (
+                        <Route key={index} path={route.path} element={route.element} />
+                    ))}
                 </Routes>
             </div>
+            {user.isSuspended && (
+                <SuspensionDialog 
+                    reason={user.suspensionReason || "No reason provided"} 
+                    open={true}
+                    onOpenChange={() => {}} // Suspended users can't close the dialog
+                />
+            )}
         </BrowserRouter>
     )
 }

frontend/src/core/api/profileApi.ts

@@ -4,7 +4,8 @@ import type { UserProfile } from "@/core/types";
 
 export interface ProfileData {
     profile_picture?: string;
-    nickname?: string;
+    username?: string;
+    display_name?: string;
     description?: string;
 }
 
@@ -26,7 +27,8 @@ export async function loadProfile(token: string): Promise<ProfileData | null> {
             // Map backend fields to frontend fields
             return {
                 profile_picture: data.profile_picture,
-                nickname: data.username,
+                username: data.username,
+                display_name: data.display_name,
                 description: data.bio
             };
         }
@@ -69,7 +71,8 @@ export async function updateProfile(token: string, data: Partial<ProfileData>):
     try {
         // Map frontend fields to backend fields
         const backendData = {
-            nickname: data.nickname,
+            username: data.username,
+            display_name: data.display_name,
             description: data.description
         };
 
@@ -126,3 +129,64 @@ export async function fetchUserProfile(token: string, username: string): Promise
         return null;
     }
 }
+
+/**
+ * Fetches user profile data by user ID
+ */
+export async function fetchUserProfileById(token: string, userId: number): Promise<UserProfile | null> {
+    try {
+        const response = await fetch(`${API_BASE_URL}/user/id/${userId}`, {
+            headers: getAuthHeaders(token)
+        });
+
+        if (response.ok) {
+            return await response.json();
+        }
+
+        return null;
+    } catch (error) {
+        console.error('Error fetching user profile by ID:', error);
+        return null;
+    }
+}
+
+/**
+ * Toggles verification status for a user (owner only)
+ */
+export async function verifyUser(userId: number, token: string): Promise<{verified: boolean} | null> {
+    try {
+        const response = await fetch(`${API_BASE_URL}/user/${userId}/verify`, {
+            method: 'POST',
+            headers: getAuthHeaders(token)
+        });
+
+        if (response.ok) {
+            return await response.json();
+        }
+
+        return null;
+    } catch (error) {
+        console.error('Error verifying user:', error);
+        return null;
+    }
+}
+
+/**
+ * Checks if a user is similar to any verified user
+ */
+export async function checkUserSimilarity(userId: number, token: string): Promise<{isSimilar: boolean, similarTo?: string} | null> {
+    try {
+        const response = await fetch(`${API_BASE_URL}/user/check-similarity/${userId}`, {
+            headers: getAuthHeaders(token)
+        });
+
+        if (response.ok) {
+            return await response.json();
+        }
+
+        return null;
+    } catch (error) {
+        console.error('Error checking user similarity:', error);
+        return null;
+    }
+}

frontend/src/core/components/Input.tsx

@@ -0,0 +1,127 @@
+import React, { useState, useEffect, useRef, useCallback } from 'react';
+import { createPortal } from 'react-dom';
+import useCombinedRefs from '@/core/hooks/useCombinedRefs';
+import { id } from '@/utils/utils';
+
+interface AutoResizeInputProps extends React.InputHTMLAttributes<HTMLInputElement> {
+    autoresizing?: true;
+    placeholderMinWidth?: boolean;
+    onAutosize?: (width: number) => void;
+}
+
+interface InputProps extends React.InputHTMLAttributes<HTMLInputElement> {
+    autoresizing?: false;
+    placeholderMinWidth?: false;
+    onAutosize?: undefined;
+}
+
+export function Input({ 
+    autoresizing = false,
+    placeholderMinWidth = false,
+    onAutosize,
+    style: inputStyle,
+    ...inputProps
+}: AutoResizeInputProps | InputProps) {
+    const [inputWidth, setInputWidth] = useState(0);
+
+    const sizerRef = useRef<HTMLDivElement>(null);
+    const placeholderSizerRef = useRef<HTMLDivElement>(null);
+    const [inputRef, inputElement] = useCombinedRefs<HTMLInputElement>();
+
+    const sizerStyle: React.CSSProperties = {
+        position: 'absolute',
+        top: 0,
+        left: 0,
+        visibility: 'hidden',
+        height: 0,
+        overflow: 'scroll',
+        whiteSpace: 'pre',
+    };
+
+    const copyStyles = useCallback((styles: CSSStyleDeclaration, node: HTMLElement) => {
+        node.style.fontSize = styles.fontSize;
+        node.style.fontFamily = styles.fontFamily;
+        node.style.fontWeight = styles.fontWeight;
+        node.style.fontStyle = styles.fontStyle;
+        node.style.letterSpacing = styles.letterSpacing;
+        node.style.textTransform = styles.textTransform;
+    }, []);
+
+    const updateInputWidth = useCallback(() => {
+        if (!sizerRef.current || typeof sizerRef.current.scrollWidth === 'undefined') {
+            return;
+        }
+
+        let newInputWidth: number;
+        
+        if (inputProps.placeholder && (!inputProps.value || (inputProps.value && placeholderMinWidth))) {
+            const sizerWidth = sizerRef.current.scrollWidth;
+            const placeholderWidth = placeholderSizerRef.current?.scrollWidth || 0;
+            newInputWidth = Math.max(sizerWidth, placeholderWidth) + 2;
+        } else {
+            newInputWidth = sizerRef.current.scrollWidth + 2;
+        }
+
+
+        if (newInputWidth !== inputWidth) {
+            setInputWidth(newInputWidth);
+            onAutosize?.(newInputWidth);
+        }
+    }, [inputProps.placeholder, inputProps.value, inputProps.type, placeholderMinWidth, inputWidth, onAutosize]);
+
+    const copyInputStyles = useCallback(() => {
+        if (!inputElement.current || !window.getComputedStyle) {
+            return;
+        }
+
+        const inputStyles = window.getComputedStyle(inputElement.current);
+        if (!inputStyles) {
+            return;
+        }
+
+        copyStyles(inputStyles, sizerRef.current!);
+        if (placeholderSizerRef.current) {
+            copyStyles(inputStyles, placeholderSizerRef.current);
+        }
+    }, [inputElement]);
+
+    useEffect(() => {
+        if (autoresizing) {
+            copyInputStyles();
+            updateInputWidth();
+        }
+    }, [autoresizing, copyInputStyles, updateInputWidth]);
+
+    useEffect(() => {
+        if (autoresizing) {
+            updateInputWidth();
+        }
+    }, [inputProps.value, inputProps.placeholder, autoresizing, updateInputWidth]);
+
+    return (
+        <>
+            <input
+                {...inputProps}
+                ref={inputRef}
+                style={{
+                    boxSizing: 'content-box',
+                    width: autoresizing ? `${inputWidth}px` : undefined,
+                    ...inputStyle,
+                }}
+            />
+            {autoresizing && createPortal(
+                <>
+                    <div ref={sizerRef} style={sizerStyle}>
+                        {inputProps.defaultValue || inputProps.value || ''}
+                    </div>
+                    {inputProps.placeholder && (
+                        <div ref={placeholderSizerRef} style={sizerStyle}>
+                            {inputProps.placeholder}
+                        </div>
+                    )}
+                </>,
+                id("root")
+            )}
+        </>
+    );
+}

frontend/src/core/components/MaterialTextField.tsx

@@ -0,0 +1,9 @@
+import type { TextField } from "mdui/components/text-field";
+
+interface TextFieldProps extends React.ComponentPropsWithoutRef<"mdui-text-field"> { 
+    ref?: React.Ref<TextField> 
+}
+
+export function MaterialTextField({ ref, ...props }: TextFieldProps) {
+    return <mdui-text-field autocomplete="off" ref={ref as React.Ref<HTMLElement>} {...props} />
+}

frontend/src/core/components/StatusBadge.tsx

@@ -0,0 +1,51 @@
+import { useState, useEffect } from "react";
+import { checkUserSimilarity } from "@/core/api/profileApi";
+import { useAppState } from "@/pages/chat/state";
+
+interface StatusBadgeProps {
+    verified: boolean;
+    userId?: number;
+    size?: "small" | "medium" | "large";
+}
+
+export function StatusBadge({ verified, userId, size = "small" }: StatusBadgeProps) {
+    const [isSimilarToVerified, setIsSimilarToVerified] = useState(false);
+    const { user } = useAppState();
+    
+    const className = `status-badge ${size}`;
+
+    // Check similarity for unverified users
+    useEffect(() => {
+        if (!verified && userId && user.authToken) {
+            checkUserSimilarity(userId, user.authToken)
+                .then(result => {
+                    setIsSimilarToVerified(result?.isSimilar || false);
+                })
+                .catch(error => {
+                    console.error('Error checking similarity:', error);
+                    setIsSimilarToVerified(false);
+                });
+        } else {
+            setIsSimilarToVerified(false);
+        }
+    }, [verified, userId, user.authToken]);
+
+    if (verified) {
+        return (
+            <span className={`${className} verified`} title="Подтверждённый аккаунт">
+                <mdui-icon name="verified--filled" />
+            </span>
+        );
+    }
+
+    if (isSimilarToVerified) {
+        return (
+            <span className={`${className} warning`} title="Похож на подтверждённый аккаунт">
+                <mdui-icon name="warning" />
+            </span>
+        );
+    }
+
+    // Don't show anything if not verified and not similar
+    return null;
+}

frontend/src/core/components/StyledDialog.tsx

@@ -0,0 +1,69 @@
+import { createPortal } from "react-dom";
+import { useEffect, type ReactNode } from "react";
+import { motion, AnimatePresence, type Transition } from "motion/react";
+
+interface StyledDialogProps {
+    open: boolean;
+    onOpenChange: (open: boolean) => void;
+    children: ReactNode;
+    onBackdropClick?: () => void;
+    className?: string;
+}
+
+export function StyledDialog({ 
+    open, 
+    onOpenChange, 
+    children, 
+    onBackdropClick,
+    className = ""
+}: StyledDialogProps) {
+    const transition: Transition = { duration: 0.3, type: "tween", ease: "easeInOut" };
+
+    // Handle ESC key
+    useEffect(() => {
+        if (open) {
+            function handleEsc(e: KeyboardEvent) {
+                if (e.key === "Escape") {
+                    onOpenChange(false);
+                }
+            }
+
+            document.addEventListener("keydown", handleEsc);
+            return () => document.removeEventListener("keydown", handleEsc);
+        }
+    }, [open, onOpenChange]);
+
+    return createPortal(
+        <AnimatePresence>
+            {open && (
+                <motion.div
+                    className={`styled-dialog-backdrop ${className}`}
+                    onClick={(e) => {
+                        if (e.target === e.currentTarget) {
+                            if (onBackdropClick) {
+                                onBackdropClick();
+                            } else {
+                                onOpenChange(false);
+                            }
+                        }
+                    }}
+                    initial={{ opacity: 0 }}
+                    animate={{ opacity: 1 }}
+                    exit={{ opacity: 0 }}
+                    transition={transition}>
+                    <motion.div
+                        className={`styled-dialog ${className}`}
+                        initial={{ scale: 0.9, opacity: 0 }}
+                        animate={{ scale: 1, opacity: 1 }}
+                        exit={{ scale: 0.9, opacity: 0 }}
+                        transition={transition}>
+                        <div className="styled-dialog-content">
+                            {children}
+                        </div>
+                    </motion.div>
+                </motion.div>
+            )}
+        </AnimatePresence>,
+        document.getElementById("root")!
+    );
+}

frontend/src/core/components/TextField.tsx

@@ -1,9 +0,0 @@
-import type { TextField } from "mdui/components/text-field";
-
-type TextFieldProps = React.ComponentPropsWithoutRef<"mdui-text-field">
-
-export function MaterialTextField(props: TextFieldProps & { ref?: React.Ref<TextField> }) {
-    return <mdui-text-field
-        autocomplete="off"
-        {...(props as TextFieldProps & { ref?: React.Ref<HTMLElement> })} />
-}

frontend/src/core/components/VerifyButton.tsx

@@ -0,0 +1,46 @@
+import { useState } from "react";
+import { verifyUser } from "@/core/api/profileApi";
+import { useAppState } from "@/pages/chat/state";
+
+interface VerifyButtonProps {
+    userId: number;
+    verified: boolean;
+    onVerificationChange?: (verified: boolean) => void;
+}
+
+export function VerifyButton({ userId, verified, onVerificationChange }: VerifyButtonProps) {
+    const [isVerifying, setIsVerifying] = useState(false);
+    const { user } = useAppState();
+
+    // Only show for owner
+    if (user.currentUser?.id !== 1) {
+        return null;
+    }
+
+    async function handleVerifyToggle() {
+        if (!user.authToken || isVerifying) return;
+        
+        setIsVerifying(true);
+        try {
+            const result = await verifyUser(userId, user.authToken);
+            if (result) {
+                onVerificationChange?.(result.verified);
+            }
+        } catch (error) {
+            console.error('Error toggling verification:', error);
+        } finally {
+            setIsVerifying(false);
+        }
+    }
+
+    return (
+        <mdui-button 
+            variant="filled"
+            loading={isVerifying}
+            onClick={handleVerifyToggle}
+            title={verified ? "Снять подтверждение" : "Подтвердить аккаунт"}
+        >
+            {verified ? "Отменить подтверждение" : "Подтвердить"}
+        </mdui-button>
+    );
+}

frontend/src/core/components/css/_styled-dialog.scss

@@ -0,0 +1,45 @@
+@use "../../../css/colors" as *;
+@use "../../../css/material" as *;
+@use "sass:color";
+
+// Base Styled Dialog Styles
+.styled-dialog-backdrop {
+    position: fixed;
+    top: 0;
+    left: 0;
+    right: 0;
+    bottom: 0;
+    background: rgba(0, 0, 0, 0.6);
+    backdrop-filter: blur(20px);
+    z-index: 1000;
+    display: flex;
+    align-items: center;
+    justify-content: center;
+    padding: 30px;
+    box-sizing: border-box;
+
+    .styled-dialog {
+        width: 100%;
+        max-width: 500px;
+        max-height: calc(100vh - 60px);
+        background: $color-dark-surface-container;
+        border-radius: 16px;
+        box-shadow: 0 24px 38px 3px rgba(0, 0, 0, 0.14),
+                    0 9px 46px 8px rgba(0, 0, 0, 0.12),
+                    0 11px 15px -7px rgba(0, 0, 0, 0.2);
+        overflow: hidden;
+        display: flex;
+        flex-direction: column;
+        // Framer Motion handles all animations
+        // Removed CSS transitions to prevent interference
+    
+        .styled-dialog-content {
+            flex: 1;
+            overflow-y: auto;
+            display: flex;
+            flex-direction: column;
+            width: 100%;
+            position: relative;
+        }
+    }
+}

frontend/src/core/profileLinks.ts

@@ -0,0 +1,39 @@
+/**
+ * @fileoverview Utility functions for handling profile links
+ * @description Functions to parse and handle profile links in markdown content.
+ * Supports two formats:
+ * - fromchat.ru/@username (e.g., fromchat.ru/@john_doe)
+ * - fromchat.ru/?u=<userId> (e.g., fromchat.ru/?u=123)
+ * @author Cursor
+ * @version 1.0.0
+ */
+
+import escapeStringRegexp from "escape-string-regexp";
+
+/**
+ * Parses a profile link URL and extracts user information
+ * @param url - The URL to parse
+ * @returns Object with user ID and username if it's a valid profile link, null otherwise
+ */
+export function parseProfileLink(url: string = location.pathname): { userId?: number; username?: string } | null {
+    try {
+        let host: string = url.startsWith("@") ? "" : !url.startsWith("/") ? "https://fromchat.ru/" : "/";
+
+        // Handle fromchat.ru/@username format
+        const usernameMatch = url.match(new RegExp(`${escapeStringRegexp(host)}@([a-zA-Z0-9_-]+)`));
+        if (usernameMatch) {
+            return { username: usernameMatch[1] };
+        }
+
+        // Handle fromchat.ru/?u=<userId> format
+        const userIdMatch = url.match(new RegExp(`${escapeStringRegexp(host)}\\?u=(\\d+)`));
+        if (userIdMatch) {
+            return { userId: Number(userIdMatch[1]) };
+        }
+
+        return null;
+    } catch (error) {
+        console.error('Error parsing profile link:', error);
+        return null;
+    }
+}

frontend/src/core/types.d.ts

@@ -62,12 +62,14 @@ export interface Reaction {
 
 export interface Message {
     id: number;
+    user_id: number;
     username: string;
     content: string;
     is_read: boolean;
     is_edited: boolean;
     timestamp: string;
     profile_picture?: string;
+    verified?: boolean;
     reply_to?: Message;
     files?: Attachment[];
     reactions?: Reaction[];
@@ -111,9 +113,14 @@ export interface User {
     last_seen: string;
     online: boolean;
     username: string;
+    display_name: string;
     admin?: boolean;
     bio?: string;
     profile_picture: string;
+    verified?: boolean;
+    suspended?: boolean;
+    suspension_reason?: string | null;
+    deleted?: boolean;
 }
 
 /**
@@ -130,11 +137,13 @@ export interface User {
 export interface UserProfile {
     id: number;
     username: string;
+    display_name: string;
     profile_picture?: string;
     bio?: string;
     online: boolean;
     last_seen: string;
     created_at: string;
+    verified?: boolean;
 }
 
 // ----------
@@ -163,6 +172,7 @@ export interface LoginRequest {
  */
 export interface RegisterRequest {
     username: string;
+    display_name: string;
     password: string;
     confirm_password: string;
 }

frontend/src/core/websocket.ts

@@ -11,6 +11,7 @@ import { delay } from "@/utils/utils";
 import { CallSignalingHandler } from "./calls/signaling";
 import { onlineStatusManager } from "./onlineStatusManager";
 import { typingManager } from "./typingManager";
+import { useAppState } from "@/pages/chat/state";
 
 /**
  * Creates a new WebSocket connection to the chat server
@@ -129,6 +130,19 @@ websocket.addEventListener("message", (e) => {
             typingManager.handleDmTyping(response as any);
         } else if (response.type === "stopDmTyping") {
             typingManager.handleStopDmTyping(response as any);
+        } else if (response.type === "suspended") {
+            // Handle account suspension
+            const { setSuspended } = useAppState.getState();
+            const reason = response.data?.reason || "No reason provided";
+            setSuspended(reason);
+            // Close WebSocket connection
+            websocket.close();
+        } else if (response.type === "account_deleted") {
+            // Handle account deletion - silent logout
+            const { logout } = useAppState.getState();
+            logout();
+            // Close WebSocket connection
+            websocket.close();
         }
 
         // Route message to global handler if set

frontend/src/css/_components.scss

@@ -81,4 +81,102 @@ button, input {
         border-left: 3px solid $color-dark-primary;
         padding: 0.5rem;
     }
+}
+
+// Verified badge styles
+.verified-badge {
+    display: inline-flex;
+    align-items: center;
+    color: $color-dark-primary;
+    vertical-align: middle;
+    user-select: none;
+
+    &.small {
+        font-size: 14px;
+        width: 14px;
+        height: 14px;
+    }
+
+    &.medium {
+        font-size: 18px;
+        width: 18px;
+        height: 18px;
+    }
+
+    &.large {
+        font-size: 24px;
+        width: 24px;
+        height: 24px;
+    }
+}
+
+// Status badge styles (unified for verified and warning)
+.status-badge {
+    display: inline-flex;
+    align-items: center;
+    user-select: none;
+    
+    &.verified {
+        color: $color-dark-primary;
+    }
+    
+    &.warning {
+        color: #ff9800; // Orange color for warnings
+    }
+    
+    &.small mdui-icon {
+        font-size: 14px;
+        width: 14px;
+        height: 14px;
+    }
+    
+    &.medium mdui-icon {
+        font-size: 18px;
+        width: 18px;
+        height: 18px;
+    }
+    
+    &.large mdui-icon {
+        font-size: 24px;
+        width: 24px;
+        height: 24px;
+    }
+}
+
+// Profile dialog specific styles
+.username-with-badge {
+    display: flex;
+    align-items: center;
+    gap: 8px;
+}
+
+.similarity-warning {
+    display: flex;
+    align-items: center;
+    gap: 8px;
+    padding: 12px;
+    background-color: $color-dark-error-container;
+    color: $color-dark-on-error-container;
+    border-radius: 8px;
+    margin: 12px 0;
+    font-size: 0.9rem;
+    line-height: 1.4;
+}
+
+.verify-section {
+    margin: 16px 0;
+    display: flex;
+    justify-content: center;
+}
+
+.search-result-headline {
+    display: flex;
+    align-items: center;
+    gap: 6px;
+}
+
+.dm-list-headline {
+    display: flex;
+    align-items: center;
+    gap: 6px;
 }

frontend/src/css/style.scss

@@ -2,6 +2,7 @@
 @use "components";
 @use "colors" as *;
 @use "material" as *;
+@use "../core/components/css/styled-dialog";
 
 @use "fonts/montserrat";
 @use "fonts/material-symbols";
@@ -41,4 +42,8 @@ mdui-dialog {
     > *:last-child {
         margin-block-end: 0;
     }
+}
+
+mdui-icon {
+    user-select: none;
 }

frontend/src/pages/auth/LoginPage.tsx

@@ -7,7 +7,7 @@ import { API_BASE_URL } from "@/core/config";
 import { useRef } from "react";
 import type { TextField } from "mdui/components/text-field";
 import { useAppState } from "@/pages/chat/state";
-import { MaterialTextField } from "@/core/components/TextField";
+import { MaterialTextField } from "@/core/components/MaterialTextField";
 import { initialize, isSupported, startElectronReceiver, subscribe } from "@/core/push-notifications/push-notifications";
 import { isElectron } from "@/core/electron/electron";
 import { useNavigate } from "react-router-dom";
@@ -98,6 +98,15 @@ export default function LoginPage() {
                                 }
                             } else {
                                 const data: ErrorResponse = await response.json();
+                                
+                                // Check for suspension
+                                if (response.status === 403 && response.headers.get("suspension_reason")) {
+                                    const suspensionReason = response.headers.get("suspension_reason");
+                                    const setSuspended = useAppState.getState().setSuspended;
+                                    setSuspended(suspensionReason || "No reason provided");
+                                    return; // Don't show alert, SuspensionDialog will be shown
+                                }
+                                
                                 showAlert("danger", data.message || "Неверное имя пользователя или пароль");
                             }
                         } catch (error) {
@@ -105,7 +114,7 @@ export default function LoginPage() {
                         }
                     }}>
                     <MaterialTextField
-                        label="Имя пользователя"
+                        label="@Имя пользователя"
                         id="login-username"
                         name="username"
                         variant="outlined"

frontend/src/pages/auth/RegisterPage.tsx

@@ -6,7 +6,7 @@ import { TextField } from "mdui/components/text-field";
 import type { ErrorResponse, RegisterRequest, LoginResponse } from "@/core/types";
 import { API_BASE_URL } from "@/core/config";
 import { useAppState } from "@/pages/chat/state";
-import { MaterialTextField } from "@/core/components/TextField";
+import { MaterialTextField } from "@/core/components/MaterialTextField";
 import { ensureKeysOnLogin } from "@/core/api/authApi";
 import { useNavigate } from "react-router-dom";
 import "./auth.scss";
@@ -23,6 +23,7 @@ export default function RegisterPage() {
         updateAlerts((alerts) => { alerts.push({type: type, message: message}) });
     }
 
+    const displayNameElement = useRef<TextField>(null);
     const usernameElement = useRef<TextField>(null);
     const passwordElement = useRef<TextField>(null);
     const confirmPasswordElement = useRef<TextField>(null);
@@ -36,11 +37,12 @@ export default function RegisterPage() {
                 <form onSubmit={async (e) => {
                     e.preventDefault();
 
+                    const displayName = displayNameElement.current!.value.trim();
                     const username = usernameElement.current!.value.trim();
                     const password = passwordElement.current!.value.trim();
                     const confirmPassword = confirmPasswordElement.current!.value.trim();
 
-                    if (!username || !password || !confirmPassword) {
+                    if (!displayName || !username || !password || !confirmPassword) {
                         showAlert("danger", "Пожалуйста, заполните все поля");
                         return;
                     }
@@ -50,11 +52,22 @@ export default function RegisterPage() {
                         return;
                     }
 
+                    if (displayName.length < 1 || displayName.length > 64) {
+                        showAlert("danger", "Отображаемое имя должно быть от 1 до 64 символов");
+                        return;
+                    }
+
                     if (username.length < 3 || username.length > 20) {
                         showAlert("danger", "Имя пользователя должно быть от 3 до 20 символов");
                         return;
                     }
 
+                    // Validate username format (only English letters, numbers, dashes, underscores)
+                    if (!/^[a-zA-Z0-9_-]+$/.test(username)) {
+                        showAlert("danger", "Имя пользователя может содержать только английские буквы, цифры, дефисы и подчеркивания");
+                        return;
+                    }
+
                     if (password.length < 5 || password.length > 50) {
                         showAlert("danger", "Пароль должен быть от 5 до 50 символов");
                         return;
@@ -62,6 +75,7 @@ export default function RegisterPage() {
 
                     try {
                         const request: RegisterRequest = {
+                            display_name: displayName,
                             username: username,
                             password: password,
                             confirm_password: confirmPassword
@@ -97,7 +111,18 @@ export default function RegisterPage() {
                     }
                 }}>
                     <MaterialTextField
-                        label="Имя пользователя"
+                        label="Отображаемое имя"
+                        id="register-display-name"
+                        name="display_name"
+                        variant="outlined"
+                        icon="badge--filled"
+                        autocomplete="name"
+                        maxlength={64}
+                        counter
+                        required
+                        ref={displayNameElement} />
+                    <MaterialTextField
+                        label="@Имя пользователя"
                         id="register-username"
                         name="username"
                         variant="outlined"

frontend/src/pages/chat/css/_message.scss

@@ -69,6 +69,9 @@
             margin: 10px;
             cursor: pointer;
             transition: transform 0.2s ease;
+            display: flex;
+            align-items: center;
+            gap: 4px;
 
             &:hover {
                 transform: scale(1.05);
@@ -375,3 +378,25 @@
         justify-content: center;
     }
 }
+
+// Mention link styling
+.message-content {
+    .mention-link {
+        color: $color-dark-primary;
+        text-decoration: none;
+        font-weight: 500;
+        border-radius: 4px;
+        padding: 2px 4px;
+        transition: all 0.2s ease;
+        background-color: rgba(145, 206, 244, 0.1); // TODO adjust
+        
+        &:hover {
+            background-color: rgba(145, 206, 244, 0.2); // TODO adjust
+            transform: translateY(-1px);
+        }
+        
+        &:active {
+            transform: translateY(0);
+        }
+    }
+}

frontend/src/pages/chat/css/_profile-dialog.scss

@@ -2,97 +2,58 @@
 @use "../../../css/material" as *;
 @use "sass:color";
 
-// Profile Dialog Styles
-.profile-dialog-backdrop {
-    position: fixed;
-    top: 0;
-    left: 0;
-    right: 0;
-    bottom: 0;
-    background: rgba(0, 0, 0, 0.6);
-    backdrop-filter: blur(20px);
-    z-index: 1000;
-    display: flex;
+// Profile Dialog Specific Styles
+// Base dialog styles are now in _styled-dialog.scss
+
+.styled-dialog-content {
     align-items: center;
-    justify-content: center;
-    padding: 30px;
-    box-sizing: border-box;
-    opacity: 0;
-    visibility: hidden;
-    transition: opacity 0.3s ease, visibility 0.3s ease;
 
-    &.open {
-        opacity: 1;
-        visibility: visible;
-    }
-}
-
-.profile-dialog {
-    width: 100%;
-    max-width: 500px;
-    max-height: calc(100vh - 60px);
-    background: $color-dark-surface-container;
-    border-radius: 16px;
-    box-shadow: 0 24px 38px 3px rgba(0, 0, 0, 0.14),
-                0 9px 46px 8px rgba(0, 0, 0, 0.12),
-                0 11px 15px -7px rgba(0, 0, 0, 0.2);
-    overflow: hidden;
-    display: flex;
-    flex-direction: column;
-    transform: scale(0.9);
-    opacity: 0;
-    transition: transform 0.3s ease, opacity 0.3s ease;
-
-    &.open {
-        transform: scale(1);
-        opacity: 1;
+    .error-message {
+        color: $color-dark-error;
+        font-size: small;
     }
 
-    .profile-dialog-content {
-        flex: 1;
-        overflow-y: auto;
+    .profile-picture-section {
+        position: relative;
         display: flex;
-        flex-direction: column;
+        justify-content: center;
         align-items: center;
+        margin: 16px;
 
-        .profile-picture-section {
-            position: relative;
-            display: flex;
-            justify-content: center;
-            align-items: center;
-            margin: 16px;
-
-            .profile-picture {
-                width: 120px;
-                height: 120px;
-                border-radius: 60px;
-                object-fit: cover;
-                border: 3px solid $color-dark-outline;
-            }
-
-            .profile-picture-edit-overlay {
-                position: absolute;
-                top: 0;
-                left: 0;
-                right: 0;
-                bottom: 0;
-                border-radius: 60px;
-                background: rgba(0, 0, 0, 0.6);
-                display: flex;
-                align-items: center;
-                justify-content: center;
-                opacity: 0;
-                transition: opacity 0.2s ease;
-                cursor: pointer;
-
-                &:hover {
-                    opacity: 1;
-                }
-            }
+        .profile-picture {
+            width: 120px;
+            height: 120px;
+            border-radius: 60px;
+            object-fit: cover;
+            border: 3px solid $color-dark-outline;
         }
 
-        .username-section {
-            text-align: center;
+        .profile-picture-edit-overlay {
+            position: absolute;
+            top: 0;
+            left: 0;
+            right: 0;
+            bottom: 0;
+            border-radius: 60px;
+            background: rgba(0, 0, 0, 0.6);
+            display: flex;
+            align-items: center;
+            justify-content: center;
+            opacity: 0;
+            transition: opacity 0.2s ease;
+            cursor: pointer;
+
+            &:hover {
+                opacity: 1;
+            }
+        }
+    }
+
+    .username-section {
+        text-align: center;
+
+        .username-with-badge {
+            gap: 0;
 
             .username-input {
                 background: none;
@@ -108,81 +69,106 @@
                 cursor: text;
             }
         }
+    }
 
-        .online-status-section {
-            display: flex;
-            align-items: center;
-            justify-content: center;
-            gap: 8px;
+    .online-status-section {
+        display: flex;
+        align-items: center;
+        justify-content: center;
+        gap: 8px;
 
-            .online-indicator {
-                width: 8px;
-                height: 8px;
-                border-radius: 50%;
-                background: $color-dark-primary;
+        .online-indicator {
+            width: 8px;
+            height: 8px;
+            border-radius: 50%;
+            background: $color-dark-primary;
 
-                &.offline {
-                    background: $color-dark-on-surface-variant;
-                }
-            }
-
-            .status-text {
-                font-size: 0.875rem;
-                color: $color-dark-on-surface;
+            &.offline {
+                background: $color-dark-on-surface-variant;
             }
         }
 
-        .profile-sections {
-            margin: 16px;
-            border-radius: 24px;
+        .status-text {
+            font-size: 0.875rem;
+            color: $color-dark-on-surface;
+        }
+    }
+
+    .profile-sections {
+        margin: 16px;
+        display: flex;
+        flex-direction: column;
+        gap: 4px;
+        width: calc(100% - (16px * 2));
+        box-sizing: border-box;
+
+        .section {
+            $edge-radius: 24px;
+
+            background: $color-dark-surface-container-high;
+            border-radius: 10px;
+            padding: 8px 16px;
             display: flex;
-            flex-direction: column;
-            gap: 4px;
-            overflow: hidden;
-            width: calc(100% - (16px * 2));
-            box-sizing: border-box;
+            flex-direction: row;
+            gap: 16px;
+            align-items: center;
+            transition: outline 0.1s ease;
+            outline: 0px solid transparent;
+            outline-offset: -1px;
 
-            .section {
-                background: $color-dark-surface-container-high;
-                border-radius: 10px;
-                padding: 8px 16px;
+            .content-container {
                 display: flex;
-                flex-direction: row;
-                gap: 16px;
-                align-items: center;
+                flex-direction: column;
+                gap: 4px;
+                width: 100%;
 
-                .content-container {
-                    display: flex;
-                    flex-direction: column;
-                    gap: 4px;
+                .label {
+                    font-size: small;
+                    color: $color-dark-on-surface-variant;
+                    user-select: none;
+                }
+
+                .value {
+                    color: $color-dark-on-surface;
+                    font-size: medium;
                     width: 100%;
+                    line-height: 1.4;
+                    font-family: inherit;
+                    cursor: text;
+                    outline: none;
+                    background: transparent;
+                    border: none;
+                    caret-color: $color-dark-primary;
 
-                    .label {
-                        font-size: small;
+                    &::placeholder {
                         color: $color-dark-on-surface-variant;
                     }
+                }
+            }
 
-                    .value {
-                        color: $color-dark-on-surface;
-                        font-size: medium;
-                        width: 100%;
-                        line-height: 1.4;
-                        font-family: inherit;
-                        cursor: text;
-                        outline: none;
-                        background: transparent;
-                        border: none;
-                        caret-color: $color-dark-primary;
+            // First and last section
+            &:first-child {
+                border-top-left-radius: $edge-radius;
+                border-top-right-radius: $edge-radius;
+            }
 
-                        &::placeholder {
-                            color: $color-dark-on-surface-variant;
-                        }
-                    }
+            &:last-child {
+                border-bottom-left-radius: $edge-radius;
+                border-bottom-right-radius: $edge-radius;
+            }
+
+            &.error {
+                outline: 1px solid $color-dark-error;
+
+                .error-message {
+                    margin-top: 4px;
                 }
             }
         }
     }
+}
 
+.styled-dialog {
     .profile-dialog-fab {
         position: absolute;
         bottom: 24px;
@@ -195,4 +181,28 @@
             transform: translateY(0);
         }
     }
+
+    // Admin Actions Section
+    .admin-actions-section {
+        margin-top: 24px;
+        padding-top: 24px;
+        border-top: 1px solid #e0e0e0;
+    }
+
+    .admin-actions-header {
+        font-size: 16px;
+        font-weight: 600;
+        margin: 0 0 16px 0;
+        color: #f44336;
+    }
+
+    .admin-buttons {
+        display: flex;
+        flex-direction: column;
+        gap: 12px;
+    }
+
+    .admin-buttons mdui-button {
+        width: 100%;
+    }
 }

frontend/src/pages/chat/css/_suspension-dialog.scss

@@ -0,0 +1,72 @@
+@use "../../../css/colors" as *;
+@use "../../../css/material" as *;
+@use "sass:color";
+
+// Suspension Dialog Content Styles
+.suspension-dialog-content {
+    display: flex;
+    flex-direction: column;
+    align-items: center;
+    text-align: center;
+    width: 100%;
+    padding: 24px;
+
+    .suspension-icon-section {
+        margin-bottom: 24px;
+
+        .suspension-icon {
+            font-size: 80px;
+            color: #f44336;
+            display: block;
+        }
+    }
+    
+    .suspension-text {
+        max-width: 400px;
+
+        .suspension-headline {
+            font-size: 28px;
+            font-weight: 600;
+            margin: 0 0 16px 0;
+            color: #f44336;
+            line-height: 1.2;
+        }
+        
+        .suspension-body {
+            font-size: 16px;
+            margin: 0 0 20px 0;
+            color: $color-dark-on-surface;
+            line-height: 1.5;
+        }
+
+        .suspension-reason {
+            text-align: left;
+
+            strong {
+                color: $color-dark-on-surface;
+                font-weight: 600;
+            }
+
+            .suspension-reason-text {
+                background: $color-dark-surface-container-high;
+                border-radius: 12px;
+                padding: 16px;
+                margin-top: 5px;
+                font-size: 14px;
+                color: $color-dark-on-surface;
+                text-align: left;
+            }
+        }
+        
+        .suspension-secondary {
+            font-size: 14px;
+            margin: 20px 0 0 0;
+            color: $color-dark-on-surface-variant;
+            line-height: 1.4;
+
+            a {
+                margin-left: 4px;
+            }
+        }
+    }
+}

frontend/src/pages/chat/css/chat.scss

@@ -10,4 +10,5 @@
 @use "animations";
 @use "callWindow";
 @use "profile-dialog";
-@use "typing-indicators";
+@use "typing-indicators";
+@use "suspension-dialog";

frontend/src/pages/chat/hooks/useDM.ts

@@ -69,7 +69,6 @@ export function useDM() {
 
             try {
                 lastPlaintext = (JSON.parse(await decryptDm(lastMessage, publicKey)) as DmEncryptedJSON).data.content;
-                console.log(lastPlaintext);
             } catch (error) {
                 console.error("Failed to decrypt last message:", error);
             }
@@ -174,6 +173,7 @@ export function useDM() {
 
                     decryptedMessages.push({
                         id: env.id,
+                        user_id: env.senderId,
                         content: text,
                         username: username,
                         timestamp: env.timestamp,

frontend/src/pages/chat/state.ts

@@ -19,11 +19,16 @@ export type CallStatus = "calling" | "connecting" | "active" | "ended";
 export interface ProfileDialogData {
     userId?: number;
     username?: string;
+    display_name?: string;
     profilePicture?: string;
     bio?: string;
     memberSince?: string;
     online?: boolean;
     isOwnProfile: boolean;
+    verified?: boolean;
+    suspended?: boolean;
+    suspension_reason?: string | null;
+    deleted?: boolean;
 }
 
 interface ActiveDM {
@@ -71,6 +76,8 @@ interface ChatState {
 export interface UserState {
     currentUser: User | null;
     authToken: string | null;
+    isSuspended: boolean;
+    suspensionReason: string | null;
 }
 
 interface AppState {
@@ -110,6 +117,7 @@ interface AppState {
     setUser: (token: string, user: User) => void;
     logout: () => void;
     restoreUserFromStorage: () => Promise<void>;
+    setSuspended: (reason: string) => void;
 
     // Profile dialog state
     setProfileDialog: (data: ProfileDialogData | null) => void;
@@ -224,13 +232,17 @@ export const useAppState = create<AppState>((set, get) => ({
     // User state
     user: {
         currentUser: null,
-        authToken: null
+        authToken: null,
+        isSuspended: false,
+        suspensionReason: null
     },
     setUser: (token: string, user: User) => {
         set(() => ({
             user: {
                 currentUser: user,
-                authToken: token
+                authToken: token,
+                isSuspended: user.suspended || false,
+                suspensionReason: user.suspension_reason || null
             }
         }));
 
@@ -254,8 +266,6 @@ export const useAppState = create<AppState>((set, get) => ({
                     credentials: token
                 },
                 data: {}
-            }).then(() => {
-                console.log("Ping succeeded")
             })
         } catch {}
     },
@@ -277,7 +287,9 @@ export const useAppState = create<AppState>((set, get) => ({
         set(() => ({
             user: {
                 currentUser: null,
-                authToken: null
+                authToken: null,
+                isSuspended: false,
+                suspensionReason: null
             }
         }));
     },
@@ -294,10 +306,25 @@ export const useAppState = create<AppState>((set, get) => ({
                     const user: User = await response.json();
                     restoreKeys();
 
+                    // Check if user is suspended
+                    if (user.suspended) {
+                        set(() => ({
+                            user: {
+                                currentUser: user,
+                                authToken: token,
+                                isSuspended: true,
+                                suspensionReason: user.suspension_reason || null
+                            }
+                        }));
+                        return; // Don't initialize managers or notifications for suspended users
+                    }
+
                     set(() => ({
                         user: {
                             currentUser: user,
-                            authToken: token
+                            authToken: token,
+                            isSuspended: false,
+                            suspensionReason: null
                         }
                     }));
 
@@ -313,8 +340,6 @@ export const useAppState = create<AppState>((set, get) => ({
                                 credentials: token
                             },
                             data: {}
-                        }).then(() => {
-                            console.log("Ping succeeded")
                         })
                     } catch {}
 
@@ -677,5 +702,13 @@ export const useAppState = create<AppState>((set, get) => ({
                 dmTypingUsers: newDmTypingUsers
             }
         };
-    })
+    }),
+
+    setSuspended: (reason: string) => set((state) => ({
+        user: {
+            ...state.user,
+            isSuspended: true,
+            suspensionReason: reason
+        }
+    }))
 }));

frontend/src/pages/chat/ui/ChatPage.tsx

@@ -3,9 +3,69 @@ import { RightPanel } from "./right/RightPanel";
 import "@/pages/chat/css/chat.scss";
 import useDownloadAppScreen from "@/core/hooks/useDownloadAppScreen";
 import { CallWindow } from "./right/calls/CallWindow";
+import { useEffect, useRef } from "react";
+import { useLocation, useNavigate } from "react-router-dom";
+import { useAppState } from "@/pages/chat/state";
+import { fetchUserProfileById, fetchUserProfile } from "@/core/api/profileApi";
 
 export default function ChatPage() {
     const { navigate: navigateDownloadApp } = useDownloadAppScreen();
+    const location = useLocation();
+    const navigate = useNavigate();
+    const { user, setProfileDialog } = useAppState();
+    const processedProfile = useRef<string | null>(null);
+
+    // Handle profile links ONLY from navigation state (from SmartCatchAll)
+    useEffect(() => {
+        async function handleProfileLink() {
+            if (!user.authToken) return;
+
+            // Only process profile links that come from navigation state (SmartCatchAll)
+            // This prevents re-processing on page refresh
+            if (!location.state?.profileInfo) return;
+
+            const profileInfo = location.state.profileInfo;
+            
+            // Create a unique key for this profile
+            const profileKey = profileInfo.userId
+                ? `user_${profileInfo.userId}`
+                : `username_${profileInfo.username}`;
+            
+            // Skip if we've already processed this exact profile
+            if (processedProfile.current === profileKey) return;
+            
+            processedProfile.current = profileKey; // Mark this specific profile as processed
+            
+            try {
+                let userProfile;
+                
+                if (profileInfo.userId) {
+                    // Fetch by user ID
+                    userProfile = await fetchUserProfileById(user.authToken, profileInfo.userId);
+                } else if (profileInfo.username) {
+                    // Fetch by username
+                    userProfile = await fetchUserProfile(user.authToken, profileInfo.username);
+                }
+                
+                if (userProfile) {
+                    setProfileDialog({
+                        ...userProfile,
+                        userId: userProfile.id,
+                        memberSince: userProfile.created_at,
+                        isOwnProfile: userProfile.id === user.currentUser?.id
+                    });
+                }
+                
+                // Clear the navigation state to prevent re-processing on refresh
+                navigate(location.pathname, { replace: true, state: null });
+            } catch (error) {
+                console.error("Failed to fetch user profile from URL:", error);
+            }
+        }
+
+        handleProfileLink();
+    }, [location.state, user.authToken, user.currentUser?.id, setProfileDialog, navigate, location.pathname]);
+
     if (navigateDownloadApp) return navigateDownloadApp;
 
     return (

frontend/src/pages/chat/ui/ProfileDialog.tsx

@@ -1,23 +1,80 @@
-import { useState, useEffect, useRef, useMemo } from "react";
-import { createPortal } from "react-dom";
+import { useState, useEffect, useRef, useMemo, type ReactNode } from "react";
 import { useAppState } from "@/pages/chat/state";
 import type { ProfileDialogData } from "@/pages/chat/state";
 import defaultAvatar from "@/images/default-avatar.png";
 import { confirm } from "mdui/functions/confirm";
-import { updateProfile, uploadProfilePicture, fetchUserProfile } from "@/core/api/profileApi";
+import { prompt } from "mdui/functions/prompt";
+import { updateProfile, uploadProfilePicture, fetchUserProfileById } from "@/core/api/profileApi";
 import { RichTextArea } from "@/core/components/RichTextArea";
+import { StatusBadge } from "@/core/components/StatusBadge";
+import { VerifyButton } from "@/core/components/VerifyButton";
 import { onlineStatusManager } from "@/core/onlineStatusManager";
 import { OnlineStatus } from "./right/OnlineStatus";
+import { Input } from "@/core/components/Input";
+import { StyledDialog } from "@/core/components/StyledDialog";
+
+interface SectionProps {
+    type: string;
+    icon: string;
+    label: string;
+    error?: string;
+    value?: string;
+    onChange?: (value: string) => void;
+    readOnly: boolean;
+    placeholder?: string;
+    textArea?: boolean;
+}
+
+function Section({ type, icon, label, error, value, onChange, readOnly, placeholder, textArea = false }: SectionProps) {
+    let valueComponent: ReactNode = null;
+
+    if (onChange) {
+        if (textArea) {
+            valueComponent = (
+                <RichTextArea
+                    text={value || ""}
+                    onTextChange={onChange}
+                    placeholder={placeholder}
+                    className="value"
+                    rows={1}
+                    readOnly={readOnly} />
+            );
+        } else {
+            valueComponent = (
+                <input
+                    className="value"
+                    type="text"
+                    value={value}
+                    onChange={e => onChange(e.target.value)}
+                    readOnly={readOnly} />
+            );
+        }
+    } else {
+        valueComponent = <span className="value">{value}</span>
+    }
+
+    return (
+        <div className={`section ${type} ${error ? 'error' : ''}`}>
+            <mdui-icon name={icon} />
+            <div className="content-container">
+                <label className="label">{label}</label>
+                {valueComponent}
+                {error && (
+                    <div className="error-message">{error}</div>
+                )}
+            </div>
+        </div>
+    )
+}
 
 export function ProfileDialog() {
-    const { chat, user, closeProfileDialog } = useAppState();
+    const { chat, user, closeProfileDialog, setUser } = useAppState();
     const [isOpen, setIsOpen] = useState(false);
     const [originalData, setOriginalData] = useState<ProfileDialogData | null>(null);
     const [currentData, setCurrentData] = useState<ProfileDialogData | null>(null);
     const [isSaving, setIsSaving] = useState(false);
+    const [errors, setErrors] = useState<{[key: string]: string}>({});
     const fileInputRef = useRef<HTMLInputElement>(null);
-    const backdropRef = useRef<HTMLDivElement>(null);
-    const dialogRef = useRef<HTMLDivElement>(null);
 
     // Handle dialog open/close based on state
     useEffect(() => {
@@ -25,38 +82,24 @@ export function ProfileDialog() {
             // Fetch fresh data when opening dialog
             fetchFreshProfileData(chat.profileDialog);
         } else if (!chat.profileDialog && isOpen) {
-            // Start close animation
-            if (backdropRef.current && dialogRef.current) {
-                backdropRef.current.classList.remove('open');
-                dialogRef.current.classList.remove('open');
-
-                // Wait for animation to complete before closing
-                setTimeout(() => {
-                    setIsOpen(false);
-                }, 300); // Match CSS transition duration
-            } else {
-                setIsOpen(false);
-            }
+            setIsOpen(false);
         }
     }, [chat.profileDialog, isOpen]);
 
-    const fetchFreshProfileData = async (profileData: ProfileDialogData) => {
+    async function fetchFreshProfileData(profileData: ProfileDialogData) {
         if (!user.authToken) return;
 
         try {
             let freshData = profileData;
 
-            // If it's not the public chat and has a username, fetch fresh data
-            if (profileData.username && profileData.username !== "Общий чат" && profileData.userId) {
-                const userProfile = await fetchUserProfile(user.authToken, profileData.username);
+            // If it's not the public chat and has a user ID, fetch fresh data
+            if (profileData.userId && profileData.username !== "Общий чат") {
+                const userProfile = await fetchUserProfileById(user.authToken, profileData.userId);
                 if (userProfile) {
                     freshData = {
-                        userId: userProfile.id,
-                        username: userProfile.username,
-                        profilePicture: userProfile.profile_picture,
-                        bio: userProfile.bio,
+                        ...userProfile,
+                        userId: userProfile.id, // Preserve the userId field
                         memberSince: userProfile.created_at,
-                        online: userProfile.online,
                         isOwnProfile: profileData.isOwnProfile
                     };
                 }
@@ -72,35 +115,9 @@ export function ProfileDialog() {
             setCurrentData(profileData);
             setIsOpen(true);
         }
-    };
+    }
 
-    // Trigger transition after component mounts
-    useEffect(() => {
-        if (isOpen) {
-            // Small delay to ensure DOM is ready for transition
-            const timer = setTimeout(() => {
-                if (backdropRef.current && dialogRef.current) {
-                    backdropRef.current.classList.add('open');
-                    dialogRef.current.classList.add('open');
-                }
-            }, 10);
-            return () => clearTimeout(timer);
-        }
-    }, [isOpen]);
 
-    // Handle ESC key
-    useEffect(() => {
-        const handleEsc = (e: KeyboardEvent) => {
-            if (e.key === "Escape" && isOpen) {
-                handleClose();
-            }
-        };
-
-        if (isOpen) {
-            document.addEventListener("keydown", handleEsc);
-            return () => document.removeEventListener("keydown", handleEsc);
-        }
-    }, [isOpen]);
 
     // Subscribe to user's online status when dialog opens
     useEffect(() => {
@@ -117,6 +134,14 @@ export function ProfileDialog() {
         }
     }, [isOpen, currentData?.userId, currentData?.isOwnProfile]);
 
+
+    // Validate fields when data changes
+    useEffect(() => {
+        if (currentData && isOpen) {
+            validateFields();
+        }
+    }, [currentData, isOpen]);
+
     const hasChanges = useMemo(() => {
         if (!originalData || !currentData) return false;
 
@@ -127,13 +152,14 @@ export function ProfileDialog() {
         };
 
         return (
+            normalizeValue(originalData.display_name) !== normalizeValue(currentData.display_name) ||
             normalizeValue(originalData.username) !== normalizeValue(currentData.username) ||
             normalizeValue(originalData.bio) !== normalizeValue(currentData.bio) ||
             originalData.profilePicture !== currentData.profilePicture
         );
     }, [originalData, currentData]);
 
-    const handleClose = async () => {
+    async function handleClose() {
         if (hasChanges) {
             try {
                 await confirm({
@@ -142,52 +168,45 @@ export function ProfileDialog() {
                     confirmText: "Закрыть",
                     cancelText: "Отмена"
                 });
-                triggerCloseAnimation();
+                closeProfileDialog();
             } catch {
                 // User cancelled, do nothing
             }
-        } else {
-            triggerCloseAnimation();
-        }
-    };
-
-    const triggerCloseAnimation = () => {
-        if (backdropRef.current && dialogRef.current) {
-            backdropRef.current.classList.remove('open');
-            dialogRef.current.classList.remove('open');
-
-            // Wait for animation to complete before closing
-            setTimeout(() => {
-                closeProfileDialog();
-            }, 300); // Match CSS transition duration
         } else {
             closeProfileDialog();
         }
     };
 
-    const handleBackdropClick = (e: React.MouseEvent) => {
-        if (e.target === e.currentTarget) {
-            handleClose();
-        }
-    };
 
-    const handleUsernameChange = (e: React.ChangeEvent<HTMLInputElement>) => {
+    function handleDisplayNameChange(e: React.ChangeEvent<HTMLInputElement>) {
         if (!currentData) return;
-        setCurrentData({ ...currentData, username: e.target.value });
+        const newValue = e.target.value;
+        setCurrentData({ ...currentData, display_name: newValue });
+
+        // Validate display name in real-time
+        validateDisplayName(newValue);
     };
 
-    const handleBioChange = (newBio: string) => {
+    function handleUsernameChange(value: string) {
+        if (!currentData) return;
+        setCurrentData({ ...currentData, username: value });
+
+        // Validate username in real-time
+        validateUsername(value);
+    };
+
+    function handleBioChange(newBio: string) {
         if (!currentData) return;
         setCurrentData({ ...currentData, bio: newBio });
     };
 
-    const handleProfilePictureClick = () => {
+    function handleProfilePictureClick() {
         if (currentData?.isOwnProfile) {
             fileInputRef.current?.click();
         }
     };
 
-    const handleFileSelect = (e: React.ChangeEvent<HTMLInputElement>) => {
+    function handleFileSelect(e: React.ChangeEvent<HTMLInputElement>) {
         const file = e.target.files?.[0];
         if (file && file.type.startsWith("image/")) {
             // Open cropper dialog here - for now just update the image
@@ -202,15 +221,60 @@ export function ProfileDialog() {
         }
     };
 
-    const handleSave = async () => {
+    function validateDisplayName(value: string) {
+        let error = "";
+
+        if (!value || value.trim().length === 0) {
+            error = "Отображаемое имя не может быть пустым";
+        } else if (value.length > 64) {
+            error = "Отображаемое имя не может быть длиннее 64 символов";
+        }
+
+        setErrors(prev => ({ ...prev, display_name: error }));
+    };
+
+    function validateUsername(value: string) {
+        let error = "";
+
+        if (!value || value.trim().length === 0) {
+            error = "Имя пользователя не может быть пустым";
+        } else if (value.length < 3) {
+            error = "Имя пользователя должно быть не менее 3 символов";
+        } else if (value.length > 20) {
+            error = "Имя пользователя не может быть длиннее 20 символов";
+        } else if (!/^[a-zA-Z0-9_-]+$/.test(value)) {
+            error = "Имя пользователя может содержать только английские буквы, цифры, дефисы и подчеркивания";
+        }
+
+        setErrors(prev => ({ ...prev, username: error }));
+    };
+
+    function validateFields() {
+        if (currentData) {
+            validateDisplayName(currentData.display_name || "");
+            validateUsername(currentData.username || "");
+        }
+
+        return !errors.display_name && !errors.username;
+    };
+
+    async function handleSave() {
         if (!currentData || !user.authToken || !originalData) return;
 
+        // Validate fields first
+        if (!validateFields()) {
+            return;
+        }
+
         setIsSaving(true);
         try {
             // Update profile data
             const updateData: any = {};
+            if (originalData.display_name !== currentData.display_name) {
+                updateData.display_name = currentData.display_name;
+            }
             if (originalData.username !== currentData.username) {
-                updateData.nickname = currentData.username;
+                updateData.username = currentData.username;
             }
             if (originalData.bio !== currentData.bio) {
                 updateData.description = currentData.bio;
@@ -233,35 +297,150 @@ export function ProfileDialog() {
             // Update the original data to match current data
             setOriginalData(currentData);
 
-            // Close dialog with animation after successful save
-            triggerCloseAnimation();
+            // If this is the current user's profile and username was changed, update the current user data
+            if (currentData.isOwnProfile && user.currentUser && user.authToken) {
+                const updatedUser = {
+                    ...user.currentUser,
+                    username: currentData.username || user.currentUser.username,
+                    display_name: currentData.display_name || user.currentUser.display_name,
+                    bio: currentData.bio || user.currentUser.bio,
+                    profile_picture: currentData.profilePicture || user.currentUser.profile_picture
+                };
+                setUser(user.authToken, updatedUser);
+            }
+
+            // Close dialog after successful save
+            closeProfileDialog();
         } catch (error) {
             console.error("Failed to save profile:", error);
+            // Handle API errors
+            if (error instanceof Error && error.message.includes("уже занято")) {
+                setErrors({ username: "Это имя пользователя уже занято" });
+            } else {
+                setErrors({ general: "Ошибка при сохранении профиля" });
+            }
         } finally {
             setIsSaving(false);
         }
-    };
+    }
 
-    const formatDate = (dateString: string) => {
+    function formatDate(dateString: string) {
         return new Date(dateString).toLocaleDateString("ru-RU", {
             year: "numeric",
             month: "long",
             day: "numeric"
         });
-    };
+    }
 
-    if (!isOpen || !currentData) return null;
+    async function handleSuspend() {
+        if (!currentData?.userId || !user.authToken) return;
 
-    return createPortal(
-        <div
-            ref={backdropRef}
-            className="profile-dialog-backdrop"
-            onClick={handleBackdropClick}
+        const isSuspending = !currentData.suspended;
+
+        try {
+            if (isSuspending) {
+                const reason = await prompt({
+                    headline: "Suspend Account",
+                    description: "Enter the reason for suspending this account:",
+                    confirmText: "Suspend",
+                    cancelText: "Cancel"
+                });
+
+                if (reason) {
+                    const response = await fetch(`/api/user/${currentData.userId}/suspend`, {
+                        method: "POST",
+                        headers: {
+                            "Authorization": `Bearer ${user.authToken}`,
+                            "Content-Type": "application/json"
+                        },
+                        body: JSON.stringify({ reason })
+                    });
+
+                    if (response.ok) {
+                        closeProfileDialog();
+                    } else {
+                        const error = await response.json();
+                        console.error("Failed to suspend user:", error);
+                    }
+                }
+            } else {
+                // Unsuspend user
+                const response = await fetch(`/api/user/${currentData.userId}/unsuspend`, {
+                    method: "POST",
+                    headers: {
+                        "Authorization": `Bearer ${user.authToken}`,
+                        "Content-Type": "application/json"
+                    }
+                });
+
+                if (response.ok) {
+                    closeProfileDialog();
+                } else {
+                    const error = await response.json();
+                    console.error("Failed to unsuspend user:", error);
+                }
+            }
+        } catch (error) {
+            console.error(`Failed to ${isSuspending ? 'suspend' : 'unsuspend'} user:`, error);
+        }
+    }
+
+    async function handleDelete() {
+        if (!currentData?.userId || !user.authToken) return;
+
+        try {
+            await confirm({
+                headline: "Delete Account",
+                description: "This will permanently delete user data but preserve messages and conversations. If the user is online, they will be immediately logged out. This action cannot be undone.",
+                confirmText: "Delete",
+                cancelText: "Cancel"
+            });
+
+            const response = await fetch(`/api/user/${currentData.userId}/delete`, {
+                method: "POST",
+                headers: {
+                    "Authorization": `Bearer ${user.authToken}`,
+                    "Content-Type": "application/json"
+                }
+            });
+
+            if (response.ok) {
+                closeProfileDialog();
+            } else {
+                const error = await response.json();
+                console.error("Failed to delete user:", error);
+            }
+        } catch (error) {
+            // User cancelled or error occurred
+            console.error("Failed to delete user:", error);
+        }
+    }
+
+
+    const fabVisible = useMemo(() => {
+        let hasErrors = false;
+        Object.values(errors).forEach(error => {
+            if (error) {
+                hasErrors = true;
+            }
+        });
+
+        return hasChanges && currentData?.isOwnProfile && !isSaving && !hasErrors;
+    }, [hasChanges, currentData?.isOwnProfile, isSaving, errors]);
+
+    if (!currentData) return null;
+
+    return (
+        <StyledDialog
+            open={isOpen}
+            onOpenChange={(open) => {
+                if (!open) {
+                    handleClose();
+                }
+            }}
+            onBackdropClick={handleClose}
         >
-            <div ref={dialogRef} className="profile-dialog">
-                <div className="profile-dialog-content">
-                    {/* Profile Picture */}
-                    <div className="profile-picture-section">
+            <div className="profile-picture-section">
                         <img
                             className="profile-picture"
                             src={currentData.profilePicture || defaultAvatar}
@@ -281,72 +460,132 @@ export function ProfileDialog() {
                         )}
                     </div>
 
-                    {/* Username */}
-                    {currentData.username && (
-                        <div className="username-section">
-                            <input
+                    <div className={`username-section ${errors.display_name ? 'error' : ''}`}>
+                        <div className="username-with-badge">
+                            <Input
+                                autoresizing={true}
                                 className="username-input"
                                 type="text"
-                                value={currentData.username}
-                                onChange={handleUsernameChange}
+                                value={currentData.display_name}
+                                onChange={handleDisplayNameChange}
                                 readOnly={!currentData.isOwnProfile}
-                                placeholder="Имя пользователя"
+                                placeholder="Имя" />
+                            <StatusBadge 
+                                verified={currentData.verified || false}
+                                userId={currentData.userId}
+                                size="large" />
+                        </div>
+                        {errors.display_name && (
+                            <div className="error-message">{errors.display_name}</div>
+                        )}
+                    </div>
+
+                    {(currentData?.userId || currentData?.isOwnProfile) && !currentData.deleted && (
+                        <div className="online-status-section">
+                            <OnlineStatus userId={currentData.userId || user.currentUser!.id} />
+                        </div>
+                    )}
+
+                    {/* Admin Actions Section - Hide for deleted users */}
+                    {!currentData.isOwnProfile && user.currentUser?.id === 1 && !currentData.deleted && (
+                        <div className="admin-actions-section">
+                            <h3 className="admin-actions-header">Admin Actions</h3>
+                            <div className="admin-buttons">
+                                <mdui-button 
+                                    variant="filled" 
+                                    color="error"
+                                    icon={currentData.suspended ? "check_circle--filled" : "block--filled"}
+                                    onClick={handleSuspend}
+                                >
+                                    {currentData.suspended ? "Unsuspend Account" : "Suspend Account"}
+                                </mdui-button>
+                                <mdui-button 
+                                    variant="filled" 
+                                    color="error"
+                                    icon="delete_forever--filled"
+                                    onClick={handleDelete}
+                                >
+                                    Delete Account
+                                </mdui-button>
+                                <VerifyButton 
+                                    userId={currentData.userId!}
+                                    verified={currentData.verified || false}
+                                    onVerificationChange={(verified) => {
+                                        setCurrentData({ ...currentData, verified });
+                                    }}
+                                />
+                            </div>
+                        </div>
+                    )}
+
+                    {/* Verify button for non-admin owner */}
+                    {!currentData.isOwnProfile && currentData.userId && user.currentUser?.id !== 1 && (
+                        <div className="verify-section">
+                            <VerifyButton 
+                                userId={currentData.userId}
+                                verified={currentData.verified || false}
+                                onVerificationChange={(verified) => {
+                                    setCurrentData({ ...currentData, verified });
+                                }}
                             />
                         </div>
                     )}
 
-                    {/* Online Status */}
-                    {currentData?.userId && (
-                        <div className="online-status-section">
-                            <OnlineStatus userId={currentData.userId} />
+                    {/* Hide profile sections for deleted users */}
+                    {!currentData.deleted && (
+                        <div className="profile-sections">
+                            <Section
+                                type="username"
+                                error={errors.username}
+                                icon="alternate_email--filled"
+                                label="Имя пользователя:"
+                                value={currentData.username}
+                                onChange={handleUsernameChange}
+                                readOnly={!currentData.isOwnProfile}
+                                placeholder="username" />
+
+                            {currentData.bio !== undefined && (
+                                <Section
+                                    type="bio"
+                                    icon="info--filled"
+                                    label="О себе:"
+                                    value={currentData.bio}
+                                    onChange={handleBioChange}
+                                    readOnly={!currentData.isOwnProfile}
+                                    placeholder="Нет информации о себе"
+                                    textArea />
+                            )}
+
+                            {currentData.memberSince && (
+                                <Section
+                                    type="member-since"
+                                    icon="calendar_month--filled"
+                                    label="Участник с:"
+                                    value={formatDate(currentData.memberSince)}
+                                    readOnly={true} />
+                            )}
+
+                            {currentData.verified && (
+                                <Section
+                                    type="verified"
+                                    icon="verified--filled"
+                                    label="Верификация:"
+                                    value="Этот аккаунт - официальное лицо FromChat."
+                                    readOnly={true}
+                                />
+                            )}
                         </div>
                     )}
 
-                    <div className="profile-sections">
-                        {/* Bio */}
-                        {currentData.bio !== undefined && (
-                            <div className="section bio">
-                                <mdui-icon name="info--filled" />
-                                <div className="content-container">
-                                    <label className="label">О себе:</label>
-                                    <RichTextArea
-                                        text={currentData.bio || ""}
-                                        onTextChange={handleBioChange}
-                                        placeholder="Нет информации о себе"
-                                        className="value"
-                                        rows={1}
-                                        readOnly={!currentData.isOwnProfile}
-                                    />
-                                </div>
-                            </div>
-                        )}
-
-                        {/* Member Since */}
-                        {currentData.memberSince && (
-                            <div className="section member-since">
-                                <mdui-icon name="calendar_month--filled" />
-                                <div className="content-container">
-                                    <span className="label">Участник с:</span>
-                                    <span className="value">
-                                        {formatDate(currentData.memberSince)}
-                                    </span>
-                                </div>
-                            </div>
-                        )}
-                    </div>
-                </div>
-
-                {/* Save FAB */}
                 {currentData.isOwnProfile && (
                     <mdui-fab
                         icon="check"
-                        className={`profile-dialog-fab ${hasChanges ? "visible" : ""}`}
+                        className={`profile-dialog-fab ${fabVisible ? "visible" : ""}`}
                         onClick={handleSave}
                         disabled={isSaving}
                     />
                 )}
 
-                {/* Hidden file input */}
                 <input
                     ref={fileInputRef}
                     type="file"
@@ -354,8 +593,6 @@ export function ProfileDialog() {
                     style={{ display: "none" }}
                     onChange={handleFileSelect}
                 />
-            </div>
-        </div>,
-        document.getElementById("root")!
+        </StyledDialog>
     );
 }

frontend/src/pages/chat/ui/SuspensionDialog.tsx

@@ -0,0 +1,42 @@
+import { StyledDialog } from "@/core/components/StyledDialog";
+
+interface SuspensionDialogProps {
+    reason: string;
+    open: boolean;
+    onOpenChange: (open: boolean) => void;
+}
+
+export function SuspensionDialog({ reason, open, onOpenChange }: SuspensionDialogProps) {
+    return (
+        <StyledDialog
+            open={open}
+            onOpenChange={onOpenChange}
+        >
+            <div className="suspension-dialog-content">
+                <div className="suspension-icon-section">
+                    <mdui-icon name="block--filled" className="suspension-icon" />
+                </div>
+                
+                <div className="suspension-text">
+                    <h2 className="suspension-headline">Аккаунт заблокирован</h2>
+                    <p className="suspension-body">
+                        Ваш аккаунт был заблокирован за нарушение правил сообщества. 
+                        Вы не можете отправлять сообщения или взаимодействовать с другими пользователями.
+                    </p>
+                    {reason && reason !== "No reason provided" && (
+                        <div className="suspension-reason">
+                            <strong>Причина блокировки:</strong> 
+                            <div className="suspension-reason-text">
+                                {reason}
+                            </div>
+                        </div>
+                    )}
+                    <p className="suspension-secondary">
+                        Если вы считаете, что блокировка была применена по ошибке,
+                        <a href="https://t.me/denis0001_dev" target="_blank" rel="noopener noreferrer">обратитесь к администратору</a> для рассмотрения вашего случая.
+                    </p>
+                </div>
+            </div>
+        </StyledDialog>
+    );
+}

frontend/src/pages/chat/ui/left/ChatHeader.tsx

@@ -13,7 +13,8 @@ export function ChatHeader() {
     const handleProfileClick = () => {
         setProfileDialog({
             userId: user.currentUser?.id,
-            username: profileData?.nickname || "Пользователь",
+            username: profileData?.username || "Пользователь",
+            display_name: profileData?.display_name || "Пользователь",
             profilePicture: profileData?.profile_picture,
             bio: profileData?.description,
             memberSince: user.currentUser?.created_at,

frontend/src/pages/chat/ui/left/ChatTabs.tsx

@@ -1,21 +1,16 @@
 import { useAppState, type ChatTabs } from "@/pages/chat/state";
 import { UnifiedChatsList } from "./UnifiedChatsList";
-import type { FormEvent } from "react";
 import type { Tabs } from "mdui/components/tabs";
 
 export function ChatTabs() {
     const { chat, setActiveTab } = useAppState();
 
-    function handleChange(e: FormEvent<Tabs> & CustomEvent<{ value: string }>) {
-        setActiveTab(e.detail.value as ChatTabs);
-    }
-
     return (
         <div className="chat-tabs">
             <mdui-tabs
                 value={chat.activeTab}
                 full-width
-                onChange={handleChange}>
+                onChange={(e) => setActiveTab((e.target as Tabs).value as ChatTabs)}>
                 <mdui-tab value="chats">
                     Чаты
                 </mdui-tab>

frontend/src/pages/chat/ui/left/UnifiedChatsList.tsx

@@ -4,10 +4,11 @@ import { useDM, type DMUser } from "@/pages/chat/hooks/useDM";
 import { API_BASE_URL } from "@/core/config";
 import { getAuthHeaders } from "@/core/api/authApi";
 import { fetchUserPublicKey } from "@/core/api/dmApi";
+import { StatusBadge } from "@/core/components/StatusBadge";
 import type { Message } from "@/core/types";
 import { websocket } from "@/core/websocket";
 import { onlineStatusManager } from "@/core/onlineStatusManager";
-import { OnlineIndicator } from "../right/OnlineIndicator";
+import { OnlineIndicator } from "@/pages/chat/ui/right/OnlineIndicator";
 import defaultAvatar from "@/images/default-avatar.png";
 
 interface PublicChat {
@@ -19,13 +20,16 @@ interface PublicChat {
 
 interface DMConversation {
     id: number;
+    userId: number;
     username: string;
+    display_name: string;
     profile_picture?: string;
     online?: boolean;
     type: "dm";
     lastMessage?: string;
     unreadCount: number;
     publicKey?: string | null;
+    verified?: boolean;
 }
 
 type ChatItem = PublicChat | DMConversation;
@@ -83,7 +87,9 @@ export function UnifiedChatsList() {
 
         const dmChatItems: ChatItem[] = dmUsers.map((user: DMUser) => ({
             id: user.id,
+            userId: user.id, // Add userId field
             username: user.username,
+            display_name: user.display_name,
             profile_picture: user.profile_picture,
             online: user.online,
             type: "dm" as const,
@@ -172,13 +178,13 @@ export function UnifiedChatsList() {
         };
     }, [allChats]);
 
-    const formatPublicChatMessage = (chatId: string): string => {
+    function formatPublicChatMessage(chatId: string): string {
         const lastMessage = lastMessages[chatId];
         if (!lastMessage) {
             return "";
         }
 
-        const isCurrentUser = lastMessage.username === user.currentUser?.username;
+        const isCurrentUser = lastMessage.user_id === user.currentUser?.id;
         const prefix = isCurrentUser ? "Вы: " : `${lastMessage.username}: `;
 
         const maxContentLength = 50 - prefix.length;
@@ -187,14 +193,13 @@ export function UnifiedChatsList() {
             : lastMessage.content;
 
         return prefix + content;
-    };
+    }
 
-
-    const handlePublicChatClick = async (chatName: string) => {
+    async function handlePublicChatClick(chatName: string) {
         await switchToPublicChat(chatName);
-    };
+    }
 
-    const handleDMClick = async (dmConversation: DMConversation) => {
+    async function handleDMClick(dmConversation: DMConversation) {
         if (!dmConversation.publicKey) {
             const authToken = useAppState.getState().user.authToken;
             if (!authToken) return;
@@ -215,7 +220,7 @@ export function UnifiedChatsList() {
             profilePicture: dmConversation.profile_picture,
             online: dmConversation.online || false
         });
-    };
+    }
 
     if (isLoadingUsers) {
         return (
@@ -256,17 +261,25 @@ export function UnifiedChatsList() {
                     return (
                         <mdui-list-item
                             key={`dm-${chat.id}`}
-                            headline={chat.username}
+                            headline={chat.display_name}
                             onClick={() => handleDMClick(chat)}
                             style={{ cursor: "pointer" }}
                         >
+                            <div slot="headline" className="dm-list-headline">
+                                {chat.display_name}
+                                <StatusBadge 
+                                    verified={chat.verified || false}
+                                    userId={chat.userId}
+                                    size="small"
+                                />
+                            </div>
                             <span slot="description" className="list-description">
                                 {chat.lastMessage || "Нет сообщений"}
                             </span>
                             <div slot="icon" style={{ position: "relative", width: "40px", height: "40px", display: "inline-block" }}>
                                 <img
                                     src={chat.profile_picture || defaultAvatar}
-                                    alt={chat.username}
+                                    alt={chat.display_name}
                                     style={{
                                         width: "40px",
                                         height: "40px",

frontend/src/pages/chat/ui/left/UsernameSearch.tsx

@@ -1,14 +1,16 @@
 import { useState, useEffect } from "react";
 import { useAppState } from "@/pages/chat/state";
 import { searchUsers, fetchUserPublicKey } from "@/core/api/dmApi";
+import { StatusBadge } from "@/core/components/StatusBadge";
 import type { User } from "@/core/types";
 import { onlineStatusManager } from "@/core/onlineStatusManager";
-import { OnlineIndicator } from "../right/OnlineIndicator";
+import { OnlineIndicator } from "@/pages/chat/ui/right/OnlineIndicator";
 import defaultAvatar from "@/images/default-avatar.png";
 import SearchBar from "@/core/components/SearchBar";
 
 interface SearchUser extends User {
     publicKey?: string | null;
+    verified?: boolean;
 }
 
 export function UsernameSearch() {
@@ -68,10 +70,12 @@ export function UsernameSearch() {
         };
     }, [searchResults]);
 
+
     async function handleUserClick(searchUser: SearchUser) {
         if (!user.authToken) return;
 
         try {
+
             let publicKey = searchUser.publicKey;
             if (!publicKey) {
                 const fetchedPublicKey = await fetchUserPublicKey(searchUser.id, user.authToken);
@@ -150,6 +154,14 @@ export function UsernameSearch() {
                             onClick={() => handleUserClick(searchUser)}
                             style={{ cursor: "pointer" }}
                         >
+                            <div slot="headline" className="search-result-headline">
+                                {searchUser.username}
+                                <StatusBadge 
+                                    verified={searchUser.verified || false}
+                                    userId={searchUser.id}
+                                    size="small"
+                                />
+                            </div>
                             <div slot="icon" style={{ position: "relative", width: "40px", height: "40px", display: "inline-block" }}>
                                 <img
                                     src={searchUser.profile_picture || defaultAvatar}

frontend/src/pages/chat/ui/right/ChatMessages.tsx

@@ -133,7 +133,7 @@ export function ChatMessages({ messages = [], children, isDm = false, onReplySel
                         message={message}
                         isAuthor={isDm ?
                             (message.runtimeData?.dmEnvelope?.senderId === user.currentUser?.id) :
-                            (message.username === user.currentUser?.username)
+                            (message.user_id === user.currentUser?.id)
                         }
                         onContextMenu={handleContextMenu}
                         onReactionClick={handleReactionClick}
@@ -143,7 +143,6 @@ export function ChatMessages({ messages = [], children, isDm = false, onReplySel
                 {children}
             </div>
 
-
             <MaterialDialog
                 headline="Удалить сообщение?"
                 open={deleteDialogOpen}
@@ -158,7 +157,7 @@ export function ChatMessages({ messages = [], children, isDm = false, onReplySel
                     message={contextMenu.message}
                     isAuthor={isDm ?
                         (contextMenu.message.runtimeData?.dmEnvelope?.senderId === user.currentUser?.id) :
-                        (contextMenu.message.username === user.currentUser?.username)
+                        (contextMenu.message.user_id === user.currentUser?.id)
                     }
                     onEdit={handleEdit}
                     onReply={handleReply}

frontend/src/pages/chat/ui/right/Message.tsx

@@ -10,10 +10,12 @@ import { ecdhSharedSecret, deriveWrappingKey } from "@/utils/crypto/asymmetric";
 import { importAesGcmKey, aesGcmDecrypt } from "@/utils/crypto/symmetric";
 import { getAuthHeaders } from "@/core/api/authApi";
 import { useAppState } from "@/pages/chat/state";
-import { fetchUserProfile } from "@/core/api/profileApi";
+import { fetchUserProfileById, fetchUserProfile } from "@/core/api/profileApi";
+import { StatusBadge } from "@/core/components/StatusBadge";
 import { ub64 } from "@/utils/utils";
 import { useImmer } from "use-immer";
 import { createPortal } from "react-dom";
+import { parseProfileLink } from "@/core/profileLinks";
 
 interface MessageReactionsProps {
     reactions?: Reaction[];
@@ -147,7 +149,6 @@ interface Rect {
 }
 
 export function Message({ message, isAuthor, onContextMenu, onReactionClick, isDm = false, dmRecipientPublicKey }: MessageProps) {
-    const [formattedMessage, setFormattedMessage] = useState({ __html: "" });
     const [decryptedFiles, updateDecryptedFiles] = useImmer<Map<string, string>>(new Map());
     const [loadedImages, updateLoadedImages] = useImmer<Set<string>>(new Set());
     const [downloadingPaths, updateDownloadingPaths] = useImmer<Set<string>>(new Set());
@@ -164,26 +165,37 @@ export function Message({ message, isAuthor, onContextMenu, onReactionClick, isD
     const imageRefs = useRef<Map<string, HTMLImageElement>>(new Map());
     const dmEnvelope = message.runtimeData?.dmEnvelope;
 
-    useEffect(() => {
-        (async () => {
-            setFormattedMessage({
-                __html: DOMPurify.sanitize(
-                    await parse(message.content)
-                ).trim()
-            });
-        })();
-    }, [message]);
+    const formattedMessage = useMemo(() => {
+        // First, temporarily replace existing fromchat.ru links to avoid conflicts
+        const linkPlaceholders: string[] = [];
+        let content = message.content.replace(/https?:\/\/fromchat\.ru\/@[a-zA-Z0-9_.-]+/g, (match) => {
+            const placeholder = `__LINK_PLACEHOLDER_${linkPlaceholders.length}__`;
+            linkPlaceholders.push(match);
+            return placeholder;
+        });
+
+        // Now process @mentions that aren't in existing links
+        content = content.replace(/@([a-zA-Z0-9_.-]+)/g, (match, username) => {
+            return `<a href="https://fromchat.ru/@${username}" class="mention-link">${match}</a>`;
+        });
+
+        // Restore the original links
+        linkPlaceholders.forEach((link, index) => {
+            content = content.replace(`__LINK_PLACEHOLDER_${index}__`, link);
+        });
+
+        return {
+            __html: DOMPurify.sanitize(parse(content, { async: false })).trim()
+        };
+    }, [message.content]);
 
     // Auto-decrypt images in DMs
     useEffect(() => {
         if (isDm && message.files) {
             message.files.forEach(async (file) => {
-                console.log(file);
                 const isImage = /\.(png|jpg|jpeg|gif|webp)$/i.test(file.name || "");
                 if (isImage && file.encrypted && !decryptedFiles.has(file.path)) {
-                    console.log("Decrypting...");
                     const decryptedUrl = await decryptFile(file);
-                    console.log(decryptedUrl);
                     if (decryptedUrl) {
                         updateDecryptedFiles(draft => {
                             draft.set(file.path, decryptedUrl);
@@ -195,11 +207,7 @@ export function Message({ message, isAuthor, onContextMenu, onReactionClick, isD
     }, [message.files, isDm, decryptedFiles]);
 
     async function decryptFile(file: Attachment): Promise<string | null> {
-        if (!file.encrypted || !isDm || !user.authToken || !dmRecipientPublicKey || !dmEnvelope) {
-            debugger;
-            console.warn("Conditions not met")
-            return null;
-        }
+        if (!file.encrypted || !isDm || !user.authToken || !dmRecipientPublicKey || !dmEnvelope) return null;
 
         // Check if already decrypted
         if (decryptedFiles.has(file.path)) {
@@ -389,10 +397,10 @@ export function Message({ message, isAuthor, onContextMenu, onReactionClick, isD
     };
 
     async function handleProfileClick() {
-        if (!user.authToken || !message.username) return;
+        if (!user.authToken || !message.user_id) return;
 
         try {
-            const userProfile = await fetchUserProfile(user.authToken, message.username);
+            const userProfile = await fetchUserProfileById(user.authToken, message.user_id);
             if (userProfile) {
                 setProfileDialog({
                     ...userProfile,
@@ -406,6 +414,44 @@ export function Message({ message, isAuthor, onContextMenu, onReactionClick, isD
         }
     }
 
+    async function handleLinkClick(e: React.MouseEvent<HTMLDivElement>) {
+        const target = e.target as HTMLElement;
+
+        if (target.tagName === 'A') {
+            const profileLink = parseProfileLink((target as HTMLAnchorElement).href);
+
+            if (profileLink) {
+                e.preventDefault();
+                e.stopPropagation();
+
+                if (!user.authToken) return;
+
+                try {
+                    let userProfile;
+
+                    if (profileLink.userId) {
+                        userProfile = await fetchUserProfileById(user.authToken, profileLink.userId);
+                    } else if (profileLink.username) {
+                        userProfile = await fetchUserProfile(user.authToken, profileLink.username);
+                    }
+
+                    if (userProfile) {
+                        setProfileDialog({
+                            ...userProfile,
+                            userId: userProfile.id,
+                            memberSince: userProfile.created_at,
+                            isOwnProfile: userProfile.id === user.currentUser?.id
+                        });
+                    } else {
+                        throw new Error("Invalid link: " + (target as HTMLAnchorElement).href);
+                    }
+                } catch (error) {
+                    console.error("Failed to fetch user profile from link:", error);
+                }
+            }
+        }
+    }
+
     function handleContextMenu(e: React.MouseEvent) {
         e.preventDefault();
         e.stopPropagation();
@@ -434,7 +480,7 @@ export function Message({ message, isAuthor, onContextMenu, onReactionClick, isD
                 {!isAuthor && !isDm && (
                     <div className="message-profile-pic" onClick={handleProfileClick}>
                         <img
-                            src={message.profile_picture || defaultAvatar}
+                            src={message.username?.startsWith("Deleted User #") ? defaultAvatar : (message.profile_picture || defaultAvatar)}
                             alt={message.username}
                             onError={(e) => {
                                 const target = e.target as HTMLImageElement;
@@ -450,6 +496,11 @@ export function Message({ message, isAuthor, onContextMenu, onReactionClick, isD
                             className="message-username"
                             onClick={handleProfileClick}>
                             {message.username}
+                            <StatusBadge
+                                verified={message.verified || false}
+                                userId={message.user_id}
+                                size="small"
+                            />
                         </div>
                     )}
 
@@ -460,7 +511,10 @@ export function Message({ message, isAuthor, onContextMenu, onReactionClick, isD
                         </Quote>
                     )}
 
-                    <div className={`message-content ${isEmojiMessage ? "emoji-content" : ""} ${isSingleEmojiMessage ? "single-emoji-content" : ""}`} dangerouslySetInnerHTML={formattedMessage} />
+                    <div
+                        className={`message-content ${isEmojiMessage ? "emoji-content" : ""} ${isSingleEmojiMessage ? "single-emoji-content" : ""}`}
+                        dangerouslySetInnerHTML={formattedMessage}
+                        onClick={handleLinkClick} />
 
                     {message.files && message.files.length > 0 && (
                         <mdui-list className="message-attachments">

frontend/src/pages/chat/ui/right/MessageContextMenu.tsx

@@ -1,6 +1,7 @@
 import { useState, useEffect, useRef } from "react";
 import type { Message, Size2D } from "@/core/types";
 import { EmojiMenu } from "./EmojiMenu";
+import { useAppState } from "@/pages/chat/state";
 
 interface MessageContextMenuProps {
     message: Message;
@@ -33,6 +34,7 @@ export function MessageContextMenu({
     isOpen,
     onOpenChange
 }: MessageContextMenuProps) {
+    const { user } = useAppState();
     // Internal state for closing animation
     const [isClosing, setIsClosing] = useState(false);
     const [calculatedPosition, setCalculatedPosition] = useState(position);
@@ -209,7 +211,7 @@ export function MessageContextMenu({
                 onDelete(message);
                 handleClose();
             },
-            show: isAuthor
+            show: isAuthor || user.currentUser?.id === 1
         },
     ];
 

frontend/src/pages/chat/ui/right/panels/DMPanel.ts

@@ -7,7 +7,7 @@ import {
     editDmEnvelope,
     deleteDmEnvelope
 } from "@/core/api/dmApi";
-import { fetchUserProfile } from "@/core/api/profileApi";
+import { fetchUserProfileById } from "@/core/api/profileApi";
 import type { DmEncryptedJSON, DmEnvelope, DMWebSocketMessage, EncryptedMessageJson, Message } from "@/core/types";
 import type { UserState, ProfileDialogData } from "@/pages/chat/state";
 import { formatDMUsername } from "@/pages/chat/hooks/useDM";
@@ -84,6 +84,7 @@ export class DMPanel extends MessagePanel {
 
         const dmMsg: Message = {
             id: env.id,
+            user_id: env.senderId,
             content: content,
             username: username,
             timestamp: env.timestamp,
@@ -353,12 +354,13 @@ export class DMPanel extends MessagePanel {
         if (!this.dmData || !this.currentUser.authToken) return null;
 
         try {
-            const userProfile = await fetchUserProfile(this.currentUser.authToken, this.dmData.username);
+            const userProfile = await fetchUserProfileById(this.currentUser.authToken, this.dmData.userId);
             if (!userProfile) return null;
 
             return {
                 userId: userProfile.id,
                 username: userProfile.username,
+                display_name: userProfile.display_name,
                 profilePicture: userProfile.profile_picture,
                 bio: userProfile.bio,
                 memberSince: userProfile.created_at,

frontend/src/pages/chat/ui/right/panels/MessagePanel.ts

@@ -258,6 +258,7 @@ export abstract class MessagePanel {
         const tempId = `temp_${Date.now()}_${Math.random().toString(36).substr(2, 9)}`;
         const tempMessage: Message = {
             id: -1, // Temporary negative ID
+            user_id: this.currentUser.currentUser?.id ?? -1,
             username: this.currentUser.currentUser?.username ?? "You",
             content: content.trim(),
             is_read: false,

frontend/src/pages/chat/ui/right/panels/PublicChatPanel.ts

@@ -121,7 +121,7 @@ export class PublicChatPanel extends MessagePanel {
                     const newMsg = response.data;
 
                     // Check if this is a confirmation of a message we sent
-                    const isOurMessage = newMsg.username === this.currentUser.currentUser?.username;
+                    const isOurMessage = newMsg.user_id === this.currentUser.currentUser?.id;
                     if (isOurMessage) {
                         // This is our message being confirmed, find the temp message and replace it
                         const tempMessages = this.getMessages().filter(m => m.id === -1 && m.runtimeData?.sendingState?.tempId);
@@ -199,7 +199,8 @@ export class PublicChatPanel extends MessagePanel {
 
     async getProfile(): Promise<ProfileDialogData | null> {
         return {
-            username: "Общий чат",
+            username: "general",
+            display_name: "Общий чат",
             bio: "Общаемся со всеми пользователями FromChat!",
             isOwnProfile: false
         };

package.json

@@ -65,8 +65,10 @@
     "dependencies": {
         "dompurify": "^3.2.7",
         "electron-squirrel-startup": "^1.0.1",
+        "escape-string-regexp": "^5.0.0",
         "marked": "^16.3.0",
         "mdui": "^2.1.4",
+        "motion": "^12.23.24",
         "react": "^19.1.1",
         "react-dom": "^19.1.1",
         "react-router-dom": "^7.9.3",