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from typing import Optional
import os
from jose import JWTError, jwt
from fastapi import HTTPException, status, Depends
from fastapi.security import HTTPBearer, HTTPAuthorizationCredentials
from sqlmodel import Session
from src.core.database import get_session
from src.models.task import Task
from src.core.config import settings
from src.core.logging import log_operation, log_token_validation_result, log_token_lifecycle_event
# JWT token creation and validation functions
def create_access_token(data: dict, expires_delta: Optional[timedelta] = None):
"""
Create a JWT access token with the provided data
"""
to_encode = data.copy()
# Validate input data for security
if "user_id" in to_encode:
user_id = to_encode["user_id"]
if not isinstance(user_id, str) or len(user_id) == 0 or len(user_id) > 255:
raise ValueError("Invalid user_id: must be a non-empty string with max 255 characters")
if "role" in to_encode:
role = to_encode["role"]
if role not in ["user", "admin"]:
# In a real application, you might want to be more flexible with roles
# For now, we'll only allow "user" and "admin" roles
log_security_event("INVALID_ROLE_ASSIGNED", user_id=to_encode.get("user_id", "unknown"), severity="ERROR")
raise ValueError(f"Invalid role: {role}. Only 'user' and 'admin' roles are allowed.")
if expires_delta:
expire = datetime.utcnow() + expires_delta
else:
expire = datetime.utcnow() + timedelta(seconds=int(settings.JWT_EXPIRATION_DELTA))
to_encode.update({"exp": expire})
# Add additional security claims
to_encode.update({
"iat": datetime.utcnow(), # Issued at
"nbf": datetime.utcnow(), # Not before (token valid immediately)
})
encoded_jwt = jwt.encode(to_encode, settings.SECRET_KEY, algorithm=settings.JWT_ALGORITHM)
# Log token creation
user_id = data.get("user_id", "unknown")
log_operation("TOKEN_CREATED", user_id=user_id)
log_token_validation_result("CREATED", user_id=user_id)
return encoded_jwt
def verify_token(token: str) -> Optional[dict]:
"""
Verify a JWT token and return the payload if valid
"""
try:
# Additional security validation
if not token or len(token) == 0:
log_security_event("EMPTY_TOKEN_RECEIVED", severity="ERROR")
return None
# Check token format (should have 3 parts separated by dots)
parts = token.split('.')
if len(parts) != 3:
log_security_event("MALFORMED_TOKEN_RECEIVED", severity="ERROR")
return None
# Verify the token
payload = jwt.decode(token, settings.SECRET_KEY, algorithms=[settings.JWT_ALGORITHM])
# Additional security checks
user_id = payload.get("user_id", "unknown")
# Check that the token has not expired (double-check)
exp_time = payload.get("exp")
if exp_time:
current_time = datetime.utcnow().timestamp()
if current_time >= exp_time:
log_token_validation_result("EXPIRED", user_id=user_id, reason="Token expiry time reached")
return None
# Log successful validation
log_token_lifecycle_event("VALID", user_id=user_id)
return payload
except JWTError as e:
log_token_validation_result("INVALID", user_id="unknown", reason=f"JWT Error: {str(e)}")
log_security_event("TOKEN_VERIFICATION_FAILED", severity="ERROR", details=str(e))
return None
except Exception as e:
log_token_validation_result("INVALID", user_id="unknown", reason=f"Unexpected error: {str(e)}")
log_security_event("TOKEN_VERIFICATION_ERROR", severity="ERROR", details=str(e))
return None
def validate_jwt_token(token: str) -> Optional[dict]:
"""
Validate a JWT token and return the payload if valid.
This function specifically implements the token validation functionality
"""
try:
payload = jwt.decode(token, settings.SECRET_KEY, algorithms=[settings.JWT_ALGORITHM])
# Check if token is expired
exp_time = payload.get("exp")
if exp_time:
current_time = datetime.utcnow().timestamp()
if current_time >= exp_time:
user_id = payload.get("user_id", "unknown")
log_token_validation_result("EXPIRED", user_id=user_id, reason="Token expiry time reached")
return None
user_id = payload.get("user_id", "unknown")
log_token_validation_result("VALID", user_id=user_id)
return payload
except JWTError as e:
log_token_validation_result("INVALID", reason=str(e))
return None
def get_current_user_payload(
credentials: HTTPAuthorizationCredentials = Depends(HTTPBearer(auto_error=False)),
db: Session = Depends(get_session)
):
"""
Get the current user's payload from the JWT token
"""
if credentials is None:
log_token_validation_result("MISSING", reason="No authorization token provided")
raise HTTPException(
status_code=status.HTTP_401_UNAUTHORIZED,
detail="No authorization token provided",
headers={"WWW-Authenticate": "Bearer"},
)
token = credentials.credentials
payload = validate_jwt_token(token)
if payload is None:
user_id = "unknown"
if credentials:
# Try to extract user_id from the invalid token for logging purposes
try:
temp_payload = jwt.decode(token, settings.SECRET_KEY, algorithms=[settings.JWT_ALGORITHM], options={"verify_exp": False})
user_id = temp_payload.get("user_id", "unknown")
except:
pass
log_token_validation_result("FAILED", user_id=user_id, reason="Invalid or expired token")
raise HTTPException(
status_code=status.HTTP_401_UNAUTHORIZED,
detail="Invalid or expired token",
headers={"WWW-Authenticate": "Bearer"},
)
user_id: str = payload.get("user_id")
if user_id is None:
log_token_validation_result("FAILED", reason="No user_id in token payload")
raise HTTPException(
status_code=status.HTTP_401_UNAUTHORIZED,
detail="Could not validate credentials",
headers={"WWW-Authenticate": "Bearer"},
)
return payload
def get_current_user_id(
current_user_payload: dict = Depends(get_current_user_payload)
):
"""
Extract the user ID from the current user's payload
"""
user_id = current_user_payload.get("user_id")
if user_id is None:
raise HTTPException(
status_code=status.HTTP_401_UNAUTHORIZED,
detail="Could not validate credentials",
headers={"WWW-Authenticate": "Bearer"},
)
return user_id
def authorize_user_for_task(
task: Task,
current_user_id: str = Depends(get_current_user_id)
):
"""
Verify that the current user has access to the specified task
"""
if task.user_id != current_user_id:
log_operation("AUTHORIZATION_DENIED", user_id=current_user_id, task_id=task.id)
raise HTTPException(
status_code=status.HTTP_403_FORBIDDEN,
detail="Not authorized to access this task"
)
log_operation("AUTHORIZATION_GRANTED", user_id=current_user_id, task_id=task.id)
return task
def validate_token_not_expired(payload: dict) -> bool:
"""
Validate that the token has not expired
"""
exp_time = payload.get("exp")
if exp_time is None:
return False
current_time = datetime.utcnow().timestamp()
is_valid = current_time < exp_time
user_id = payload.get("user_id", "unknown")
if not is_valid:
log_token_validation_result("EXPIRED_CHECK", user_id=user_id, reason="Token expiry validation failed")
else:
log_token_validation_result("NOT_EXPIRED", user_id=user_id)
return is_valid
def get_user_id_from_token_payload(payload: dict) -> Optional[str]:
"""
Extract the user ID from the token payload
"""
user_id = payload.get("user_id")
if user_id:
log_operation("USER_ID_EXTRACTED", user_id=user_id)
return user_id |