OAuth 2.0 Servers

class AuthorizationEndpoint:
    def __init__(self, default_response_type: str, default_token_type: str, response_types: dict[str, callable]): ...
    
    def create_authorization_response(
        self,
        uri: str,
        http_method: str = "GET",
        body: str | None = None,
        headers: dict[str, str] | None = None,
        scopes: list[str] | None = None,
        credentials: dict[str, str] | None = None,
    ) -> tuple[dict[str, str], str, int]:
        """
        Create authorization response.
        
        Parameters:
        - uri: Authorization request URI
        - http_method: HTTP method
        - body: Request body
        - headers: Request headers
        - scopes: Requested scopes
        - credentials: User credentials and consent info
        
        Returns:
        Tuple of (headers, body, status_code) for authorization response
        """
    
    def validate_authorization_request(
        self,
        uri: str,
        http_method: str = "GET",
        body: str | None = None,
        headers: dict[str, str] | None = None,
    ) -> None:
        """Validate authorization request parameters."""

class TokenEndpoint:
    def __init__(
        self,
        default_grant_type=None,
        default_token_type=None,
        token_generator=None,
        refresh_token_generator=None,
        expires_in=None,
    ): ...
    
    def create_token_response(
        self,
        uri: str,
        http_method: str = "POST",
        body: str | None = None,
        headers: dict[str, str] | None = None,
        credentials: dict[str, str] | None = None,
        grant_type_handler=None,
        **kwargs,
    ) -> tuple[dict[str, str], str, int]:
        """
        Create token response for any grant type.
        
        Parameters:
        - uri: Token request URI
        - http_method: HTTP method
        - body: Request body
        - headers: Request headers  
        - credentials: Client credentials
        - grant_type_handler: Custom grant type handler
        
        Returns:
        Tuple of (headers, body, status_code) for token response
        """
    
    def validate_token_request(self, request) -> None:
        """Validate token request parameters."""

class ResourceEndpoint:
    def __init__(self, default_token=None, token_generator=None, expires_in=None): ...
    
    def validate_protected_resource_request(
        self,
        uri: str,
        http_method: str = "GET",
        body: str | None = None,
        headers: dict[str, str] | None = None,
        scopes: list[str] | None = None,
    ) -> tuple[bool, dict]:
        """
        Validate protected resource request.
        
        Parameters:
        - uri: Resource request URI
        - http_method: HTTP method
        - body: Request body
        - headers: Request headers
        - scopes: Required scopes
        
        Returns:
        Tuple of (valid, request) where valid indicates if token is valid
        """

class RevocationEndpoint:
    def __init__(self, request_validator, supported_token_types=None, enable_jsonp=False): ...
    
    def create_revocation_response(
        self,
        uri: str,
        http_method: str = "POST",
        body: str | None = None,
        headers: dict[str, str] | None = None,
    ) -> tuple[dict[str, str], str, int]:
        """
        Create token revocation response.
        
        Parameters:
        - uri: Revocation request URI
        - http_method: HTTP method
        - body: Request body containing token to revoke
        - headers: Request headers
        
        Returns:
        Tuple of (headers, body, status_code) for revocation response
        """
    
    def validate_revocation_request(self, request) -> None:
        """Validate token revocation request."""

class IntrospectEndpoint:
    def __init__(self, request_validator, supported_token_types=None): ...
    
    def create_introspect_response(
        self,
        uri: str,
        http_method: str = "POST",
        body: str | None = None,
        headers: dict[str, str] | None = None,
    ) -> tuple[dict[str, str], str, int]:
        """
        Create token introspection response.
        
        Parameters:
        - uri: Introspection request URI
        - http_method: HTTP method
        - body: Request body containing token to introspect
        - headers: Request headers
        
        Returns:
        Tuple of (headers, body, status_code) with token metadata
        """
    
    def validate_introspect_request(self, request) -> None:
        """Validate token introspection request."""

class MetadataEndpoint:
    def __init__(self, endpoints, claims=None, **kwargs): ...
    
    def create_metadata_response(
        self,
        uri: str,
        http_method: str = "GET",
        body: str | None = None,
        headers: dict[str, str] | None = None,
    ) -> tuple[dict[str, str], str, int]:
        """
        Create authorization server metadata response.
        
        Returns:
        Tuple of (headers, body, status_code) with server metadata JSON
        """

class WebApplicationServer:
    def __init__(
        self,
        request_validator,
        token_expires_in=None,
        token_generator=None,
        refresh_token_generator=None,
        **kwargs,
    ):
        """
        Complete OAuth 2.0 server for web applications.
        
        Combines AuthorizationEndpoint, TokenEndpoint, and ResourceEndpoint
        to support the authorization code grant flow.
        """
    
    # Inherits methods from AuthorizationEndpoint, TokenEndpoint, ResourceEndPoint
    def create_authorization_response(self, uri, http_method="GET", body=None, headers=None, scopes=None, credentials=None): ...
    def create_token_response(self, uri, http_method="POST", body=None, headers=None, credentials=None, **kwargs): ...
    def validate_protected_resource_request(self, uri, http_method="GET", body=None, headers=None, scopes=None): ...

class MobileApplicationServer:
    def __init__(
        self,
        request_validator,
        token_expires_in=None,
        token_generator=None,
        **kwargs,
    ):
        """
        OAuth 2.0 server for mobile applications.
        
        Supports the implicit grant flow for public clients
        that cannot securely store credentials.
        """

class LegacyApplicationServer:
    def __init__(
        self,
        request_validator,
        token_expires_in=None,
        token_generator=None,
        refresh_token_generator=None,
        **kwargs,
    ):
        """
        OAuth 2.0 server for legacy applications.
        
        Supports the password credentials grant flow for
        trusted first-party applications.
        """

class BackendApplicationServer:
    def __init__(
        self,
        request_validator,
        token_expires_in=None,
        token_generator=None,
        **kwargs,
    ):
        """
        OAuth 2.0 server for backend applications.
        
        Supports the client credentials grant flow for
        machine-to-machine authentication.
        """

class Server:
    def __init__(
        self,
        request_validator,
        token_expires_in=None,
        token_generator=None,
        refresh_token_generator=None,
        **kwargs,
    ):
        """
        Base OAuth 2.0 server supporting all grant types.
        
        Provides a flexible foundation for custom server implementations
        with support for authorization code, implicit, password credentials,
        and client credentials grants.
        """

from oauthlib.oauth2 import WebApplicationServer, RequestValidator
from oauthlib.common import generate_token

class MyRequestValidator(RequestValidator):
    def validate_client_id(self, client_id, request, *args, **kwargs):
        # Check if client_id exists in your database
        return client_id in ['your-client-id', 'another-client']
    
    def authenticate_client(self, request, *args, **kwargs):
        # Authenticate client credentials
        client_id = getattr(request, 'client_id', None)
        client_secret = getattr(request, 'client_secret', None)
        return verify_client_credentials(client_id, client_secret)
    
    def validate_redirect_uri(self, client_id, redirect_uri, request, *args, **kwargs):
        # Validate redirect URI is registered for this client
        return redirect_uri in get_registered_redirect_uris(client_id)
    
    def get_default_scopes(self, client_id, request, *args, **kwargs):
        # Return default scopes for client
        return ['read']
    
    def validate_scopes(self, client_id, scopes, client, request, *args, **kwargs):
        # Validate requested scopes
        allowed_scopes = get_client_scopes(client_id)
        return all(scope in allowed_scopes for scope in scopes)
    
    def save_authorization_code(self, client_id, code, request, *args, **kwargs):
        # Store authorization code in database
        store_authorization_code(client_id, code, request)
    
    def validate_code(self, client_id, code, client, request, *args, **kwargs):
        # Validate authorization code
        return is_valid_authorization_code(client_id, code)
    
    def confirm_redirect_uri(self, client_id, code, redirect_uri, client, request, *args, **kwargs):
        # Confirm redirect URI matches original request
        return get_code_redirect_uri(code) == redirect_uri
    
    def save_token(self, token, request, *args, **kwargs):
        # Store access token in database
        store_access_token(token, request)
    
    def validate_bearer_token(self, token, scopes, request):
        # Validate bearer token and scopes
        return is_valid_bearer_token(token, scopes)
    
    def get_default_redirect_uri(self, client_id, request, *args, **kwargs):
        # Return default redirect URI for client
        return get_client_default_redirect_uri(client_id)

# Create server
validator = MyRequestValidator()
server = WebApplicationServer(validator)

# Handle authorization request
def handle_authorization(request):
    try:
        # Extract request details
        uri = request.url
        http_method = request.method
        body = request.body
        headers = dict(request.headers)
        
        # Check if user is authenticated and consented
        if not user_authenticated(request):
            return redirect_to_login()
        
        if not user_consented(request):
            return show_consent_form()
        
        # Create authorization response
        headers, body, status = server.create_authorization_response(
            uri, http_method, body, headers,
            scopes=request.args.get('scope', '').split(),
            credentials={'user_id': get_user_id(request)}
        )
        
        return Response(body, status=status, headers=headers)
    
    except OAuth2Error as e:
        return Response(e.json, status=e.status_code, 
                       headers={'Content-Type': 'application/json'})

# Handle token request
def handle_token(request):
    try:
        uri = request.url
        http_method = request.method
        body = request.body
        headers = dict(request.headers)
        
        headers, body, status = server.create_token_response(
            uri, http_method, body, headers
        )
        
        return Response(body, status=status, headers=headers)
    
    except OAuth2Error as e:
        return Response(e.json, status=e.status_code,
                       headers={'Content-Type': 'application/json'})

from oauthlib.oauth2 import ResourceEndpoint
from functools import wraps

# Create resource endpoint
resource_endpoint = ResourceEndpoint()

def require_oauth(*required_scopes):
    """Decorator to protect API endpoints with OAuth."""
    def decorator(f):
        @wraps(f)
        def decorated_function(*args, **kwargs):
            # Extract request details
            uri = request.url
            http_method = request.method
            body = request.body
            headers = dict(request.headers)
            
            try:
                # Validate token and scopes
                valid, oauth_request = resource_endpoint.validate_protected_resource_request(
                    uri, http_method, body, headers, required_scopes
                )
                
                if not valid:
                    return Response('Unauthorized', status=401)
                
                # Add OAuth info to request context
                request.oauth = oauth_request
                
                return f(*args, **kwargs)
            
            except OAuth2Error as e:
                return Response(e.json, status=e.status_code,
                               headers={'Content-Type': 'application/json'})
        
        return decorated_function
    return decorator

# Usage in API endpoints
@app.route('/api/user/profile')
@require_oauth('profile:read')
def get_user_profile():
    user_id = request.oauth.user_id
    return jsonify(get_user_data(user_id))

@app.route('/api/user/settings', methods=['POST'])
@require_oauth('profile:write')
def update_user_settings():
    user_id = request.oauth.user_id
    update_user_data(user_id, request.json)
    return jsonify({'status': 'updated'})

from oauthlib.oauth2 import IntrospectEndpoint

# Create introspection endpoint
introspect_endpoint = IntrospectEndpoint(validator)

def handle_introspect(request):
    """Handle token introspection requests from resource servers."""
    try:
        uri = request.url
        http_method = request.method
        body = request.body
        headers = dict(request.headers)
        
        headers, body, status = introspect_endpoint.create_introspect_response(
            uri, http_method, body, headers
        )
        
        return Response(body, status=status, headers=headers)
    
    except OAuth2Error as e:
        return Response(e.json, status=e.status_code,
                       headers={'Content-Type': 'application/json'})

from oauthlib.oauth2 import MetadataEndpoint

# Create metadata endpoint
metadata = MetadataEndpoint([
    ('authorization_endpoint', 'https://auth.example.com/authorize'),
    ('token_endpoint', 'https://auth.example.com/token'),
    ('revocation_endpoint', 'https://auth.example.com/revoke'),
    ('introspection_endpoint', 'https://auth.example.com/introspect'),
], claims=[
    ('issuer', 'https://auth.example.com'),
    ('response_types_supported', ['code', 'token']),
    ('grant_types_supported', ['authorization_code', 'implicit', 'client_credentials']),
    ('token_endpoint_auth_methods_supported', ['client_secret_basic', 'client_secret_post']),
    ('scopes_supported', ['read', 'write', 'admin']),
])

def handle_metadata(request):
    """Serve authorization server metadata."""
    headers, body, status = metadata.create_metadata_response(
        request.url, request.method
    )
    return Response(body, status=status, headers=headers)

# Configure token expiration times
server = WebApplicationServer(
    validator,
    token_expires_in=3600,  # Access tokens expire in 1 hour
)

# Or use a function for dynamic expiration
def token_expires_in(request):
    if 'long_lived' in request.scopes:
        return 86400  # 24 hours for long-lived tokens
    return 3600  # 1 hour for regular tokens

server = WebApplicationServer(validator, token_expires_in=token_expires_in)

from oauthlib.common import generate_token
import jwt

def custom_token_generator(request):
    """Generate JWT access tokens."""
    payload = {
        'user_id': request.user_id,
        'client_id': request.client_id,
        'scopes': request.scopes,
        'exp': datetime.utcnow() + timedelta(hours=1)
    }
    return jwt.encode(payload, 'secret-key', algorithm='HS256')

server = WebApplicationServer(
    validator,
    token_generator=custom_token_generator,
    refresh_token_generator=generate_token
)