41bbd8c182
Complete rewrite from task management to full-featured chat system: Core Features: - Real-time WebSocket messaging with connection management - Direct messages and group chats with admin controls - Message types: text, images, videos, audio, documents - Message status tracking: sent, delivered, read receipts - Typing indicators and user presence (online/offline) - Message replies, editing, and deletion Security & Encryption: - End-to-end encryption with RSA + AES hybrid approach - JWT authentication for API and WebSocket connections - Secure file storage with access control - Automatic RSA key pair generation per user Media & File Sharing: - Multi-format file upload (images, videos, audio, documents) - Automatic thumbnail generation for images/videos - File size validation and MIME type checking - Secure download endpoints with permission checks Notifications & Alerts: - Real-time WebSocket notifications - Push notifications via Firebase integration - @username mention alerts with notification history - Unread message and mention counting - Custom notification types (message, mention, group invite) Advanced Features: - Group chat management with roles (member, admin, owner) - User search and chat member management - Message pagination and chat history - Last seen timestamps and activity tracking - Comprehensive API documentation with WebSocket events Architecture: - Clean layered architecture with services, models, schemas - WebSocket connection manager for real-time features - Modular notification system with multiple channels - Comprehensive error handling and validation - Production-ready with Docker support Technologies: FastAPI, WebSocket, SQLAlchemy, SQLite, Cryptography, Firebase, Pillow
90 lines
3.1 KiB
Python
90 lines
3.1 KiB
Python
import os
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from datetime import datetime, timedelta
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from typing import Any, Union
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from jose import jwt
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from passlib.context import CryptContext
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from cryptography.hazmat.primitives import hashes, serialization
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from cryptography.hazmat.primitives.asymmetric import rsa, padding
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from cryptography.hazmat.primitives.serialization import load_pem_public_key, load_pem_private_key
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import base64
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SECRET_KEY = os.getenv("SECRET_KEY", "your-secret-key-change-in-production")
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ALGORITHM = "HS256"
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ACCESS_TOKEN_EXPIRE_MINUTES = 30
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pwd_context = CryptContext(schemes=["bcrypt"], deprecated="auto")
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def create_access_token(
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subject: Union[str, Any], expires_delta: timedelta = None
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) -> str:
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if expires_delta:
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expire = datetime.utcnow() + expires_delta
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else:
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expire = datetime.utcnow() + timedelta(
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minutes=ACCESS_TOKEN_EXPIRE_MINUTES
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)
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to_encode = {"exp": expire, "sub": str(subject)}
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encoded_jwt = jwt.encode(to_encode, SECRET_KEY, algorithm=ALGORITHM)
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return encoded_jwt
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def verify_password(plain_password: str, hashed_password: str) -> bool:
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return pwd_context.verify(plain_password, hashed_password)
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def get_password_hash(password: str) -> str:
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return pwd_context.hash(password)
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# E2E Encryption utilities
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def generate_rsa_key_pair():
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"""Generate RSA key pair for E2E encryption"""
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private_key = rsa.generate_private_key(
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public_exponent=65537,
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key_size=2048,
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)
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public_key = private_key.public_key()
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# Serialize keys
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private_pem = private_key.private_bytes(
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encoding=serialization.Encoding.PEM,
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format=serialization.PrivateFormat.PKCS8,
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encryption_algorithm=serialization.NoEncryption()
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)
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public_pem = public_key.public_bytes(
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encoding=serialization.Encoding.PEM,
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format=serialization.PublicFormat.SubjectPublicKeyInfo
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)
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return private_pem.decode(), public_pem.decode()
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def encrypt_message(message: str, public_key_pem: str) -> str:
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"""Encrypt message using recipient's public key"""
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try:
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public_key = load_pem_public_key(public_key_pem.encode())
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encrypted = public_key.encrypt(
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message.encode(),
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padding.OAEP(
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mgf=padding.MGF1(algorithm=hashes.SHA256()),
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algorithm=hashes.SHA256(),
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label=None
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)
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)
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return base64.b64encode(encrypted).decode()
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except Exception:
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return message # Fallback to unencrypted if encryption fails
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def decrypt_message(encrypted_message: str, private_key_pem: str) -> str:
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"""Decrypt message using recipient's private key"""
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try:
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private_key = load_pem_private_key(private_key_pem.encode(), password=None)
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encrypted_bytes = base64.b64decode(encrypted_message.encode())
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decrypted = private_key.decrypt(
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encrypted_bytes,
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padding.OAEP(
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mgf=padding.MGF1(algorithm=hashes.SHA256()),
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algorithm=hashes.SHA256(),
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label=None
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)
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)
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return decrypted.decode()
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except Exception:
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return encrypted_message # Fallback to encrypted if decryption fails |