refactor: rename canto-backend → backend, canto-frontend → frontend

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

backend/core/security.py

@@ -0,0 +1,59 @@
+from datetime import datetime, timedelta
+from typing import Optional
+from jose import JWTError, jwt
+from passlib.context import CryptContext
+from cryptography.fernet import Fernet
+import base64
+import hashlib
+
+from config import settings
+
+pwd_context = CryptContext(schemes=["bcrypt"], deprecated="auto")
+
+def get_password_hash(password: str) -> str:
+    return pwd_context.hash(password)
+
+def verify_password(plain_password: str, hashed_password: str) -> bool:
+    return pwd_context.verify(plain_password, hashed_password)
+
+def create_access_token(data: dict, expires_delta: Optional[timedelta] = None) -> str:
+    to_encode = data.copy()
+    if expires_delta:
+        expire = datetime.utcnow() + expires_delta
+    else:
+        expire = datetime.utcnow() + timedelta(minutes=settings.ACCESS_TOKEN_EXPIRE_MINUTES)
+
+    to_encode.update({"exp": expire})
+    encoded_jwt = jwt.encode(to_encode, settings.SECRET_KEY, algorithm=settings.ALGORITHM)
+    return encoded_jwt
+
+def decode_access_token(token: str) -> Optional[str]:
+    try:
+        payload = jwt.decode(token, settings.SECRET_KEY, algorithms=[settings.ALGORITHM])
+        username: str = payload.get("sub")
+        if username is None:
+            return None
+        return username
+    except JWTError:
+        return None
+
+def _get_fernet_key() -> bytes:
+    key = hashlib.sha256(settings.SECRET_KEY.encode()).digest()
+    return base64.urlsafe_b64encode(key)
+
+def encrypt_api_key(api_key: str) -> str:
+    if not api_key:
+        return ""
+    fernet = Fernet(_get_fernet_key())
+    encrypted = fernet.encrypt(api_key.encode())
+    return encrypted.decode()
+
+def decrypt_api_key(encrypted_key: str) -> Optional[str]:
+    if not encrypted_key:
+        return None
+    try:
+        fernet = Fernet(_get_fernet_key())
+        decrypted = fernet.decrypt(encrypted_key.encode())
+        return decrypted.decode()
+    except Exception:
+        return None