How to use the oauthlib.oauth2.rfc6749.errors.OAuth2Error function in oauthlib

# redirection URI, or if the client identifier is missing or invalid,
        # the authorization server SHOULD inform the resource owner of the
        # error and MUST NOT automatically redirect the user-agent to the
        # invalid redirection URI.
        except errors.FatalClientError as e:
            log.debug('Fatal client error during validation of %r. %r.',
                      request, e)
            raise

        # If the resource owner denies the access request or if the request
        # fails for reasons other than a missing or invalid redirection URI,
        # the authorization server informs the client by adding the following
        # parameters to the fragment component of the redirection URI using the
        # "application/x-www-form-urlencoded" format, per Appendix B:
        # https://tools.ietf.org/html/rfc6749#appendix-B
        except errors.OAuth2Error as e:
            log.debug('Client error during validation of %r. %r.', request, e)
            return {'Location': common.add_params_to_uri(request.redirect_uri, e.twotuples,
                                                         fragment=True)}, None, 302

        # In OIDC implicit flow it is possible to have a request_type that does not include the access_token!
        # "id_token token" - return the access token and the id token
        # "id_token" - don't return the access token
        if "token" in request.response_type.split():
            token = token_handler.create_token(request, refresh_token=False)
        else:
            token = {}

        if request.state is not None:
            token['state'] = request.state

        for modifier in self._token_modifiers:

error = 'invalid_request'


class MissingResponseTypeError(InvalidRequestError):
    description = 'Missing response_type parameter.'


class AccessDeniedError(OAuth2Error):
    """
    The resource owner or authorization server denied the request.
    """
    error = 'access_denied'
    status_code = 401


class UnsupportedResponseTypeError(OAuth2Error):
    """
    The authorization server does not support obtaining an authorization
    code using this method.
    """
    error = 'unsupported_response_type'


class InvalidScopeError(OAuth2Error):
    """
    The requested scope is invalid, unknown, or malformed.

    https://tools.ietf.org/html/rfc6749#section-5.2
    """
    error = 'invalid_scope'
    status_code = 400

necessary information is conveyed in the response code.

        An invalid token type hint value is ignored by the authorization server
        and does not influence the revocation response.
        """
        resp_headers = {
            'Content-Type': 'application/json',
            'Cache-Control': 'no-store',
            'Pragma': 'no-cache',
        }
        request = Request(
            uri, http_method=http_method, body=body, headers=headers)
        try:
            self.validate_revocation_request(request)
            log.debug('Token revocation valid for %r.', request)
        except OAuth2Error as e:
            log.debug('Client error during validation of %r. %r.', request, e)
            response_body = e.json
            if self.enable_jsonp and request.callback:
                response_body = '%s(%s);' % (request.callback, response_body)
            resp_headers.update(e.headers)
            return resp_headers, response_body, e.status_code

        self.request_validator.revoke_token(request.token,
                                            request.token_type_hint, request)

        response_body = ''
        if self.enable_jsonp and request.callback:
            response_body = request.callback + '();'
        return {}, response_body, 200

x21 / x23-5B / x5D-7E.

        :param state: A CSRF protection value received from the client.

        :param status_code:

        :param request: OAuthlib request.
        :type request: oauthlib.common.Request
        """
        if description is not None:
            self.description = description

        message = '(%s) %s' % (self.error, self.description)
        if request:
            message += ' ' + repr(request)
        super(OAuth2Error, self).__init__(message)

        self.uri = uri
        self.state = state

        if status_code:
            self.status_code = status_code

        if request:
            self.redirect_uri = request.redirect_uri
            self.client_id = request.client_id
            self.scopes = request.scopes
            self.response_type = request.response_type
            self.response_mode = request.response_mode
            self.grant_type = request.grant_type
            if not state:
                self.state = request.state

class MismatchingStateError(OAuth2Error):
    error = 'mismatching_state'
    description = 'CSRF Warning! State not equal in request and response.'


class MissingCodeError(OAuth2Error):
    error = 'missing_code'


class MissingTokenError(OAuth2Error):
    error = 'missing_token'


class MissingTokenTypeError(OAuth2Error):
    error = 'missing_token_type'


class FatalClientError(OAuth2Error):
    """
    Errors during authorization where user should not be redirected back.

    If the request fails due to a missing, invalid, or mismatching
    redirection URI, or if the client identifier is missing or invalid,
    the authorization server SHOULD inform the resource owner of the
    error and MUST NOT automatically redirect the user-agent to the
    invalid redirection URI.

    Instead the user should be informed of the error by the provider itself.
    """
    pass

"""Client authentication failed (e.g. unknown client, no client
    authentication included, or unsupported authentication method).
    The authorization server MAY return an HTTP 401 (Unauthorized) status
    code to indicate which HTTP authentication schemes are supported.
    If the client attempted to authenticate via the "Authorization" request
    header field, the authorization server MUST respond with an
    HTTP 401 (Unauthorized) status code, and include the "WWW-Authenticate"
    response header field matching the authentication scheme used by the
    client.
    """
    error = 'invalid_client'
    status_code = 401


class InvalidGrantError(OAuth2Error):

    """The provided authorization grant (e.g. authorization code, resource
    owner credentials) or refresh token is invalid, expired, revoked, does
    not match the redirection URI used in the authorization request, or was
    issued to another client.
    """
    error = 'invalid_grant'
    status_code = 401


class UnauthorizedClientError(OAuth2Error):

    """The authenticated client is not authorized to use this authorization
    grant type.
    """
    error = 'unauthorized_client'

class InsufficientScopeError(OAuth2Error):
    """
    The request requires higher privileges than provided by the
    access token.  The resource server SHOULD respond with the HTTP
    403 (Forbidden) status code and MAY include the "scope"
    attribute with the scope necessary to access the protected
    resource.
    """
    error = 'insufficient_scope'
    status_code = 403
    description = ("The request requires higher privileges than provided by "
                   "the access token.")


class ConsentRequired(OAuth2Error):
    """
    The Authorization Server requires End-User consent.

    This error MAY be returned when the prompt parameter value in the
    Authentication Request is none, but the Authentication Request cannot be
    completed without displaying a user interface for End-User consent.
    """
    error = 'consent_required'
    status_code = 401


class LoginRequired(OAuth2Error):
    """
    The Authorization Server requires End-User authentication.

    This error MAY be returned when the prompt parameter value in the

class InvalidRequestError(OAuth2Error):
    """
    The request is missing a required parameter, includes an invalid
    parameter value, includes a parameter more than once, or is
    otherwise malformed.
    """
    error = 'invalid_request'


class MissingResponseTypeError(InvalidRequestError):
    description = 'Missing response_type parameter.'


class AccessDeniedError(OAuth2Error):
    """
    The resource owner or authorization server denied the request.
    """
    error = 'access_denied'
    status_code = 401


class UnsupportedResponseTypeError(OAuth2Error):
    """
    The authorization server does not support obtaining an authorization
    code using this method.
    """
    error = 'unsupported_response_type'


class InvalidScopeError(OAuth2Error):

description = 'Missing redirect URI.'


class MismatchingRedirectURIError(InvalidRequestFatalError):
    description = 'Mismatching redirect URI.'


class InvalidClientIdError(InvalidRequestFatalError):
    description = 'Invalid client_id parameter value.'


class MissingClientIdError(InvalidRequestFatalError):
    description = 'Missing client_id parameter.'


class InvalidRequestError(OAuth2Error):
    """
    The request is missing a required parameter, includes an invalid
    parameter value, includes a parameter more than once, or is
    otherwise malformed.
    """
    error = 'invalid_request'


class MissingResponseTypeError(InvalidRequestError):
    description = 'Missing response_type parameter.'


class AccessDeniedError(OAuth2Error):
    """
    The resource owner or authorization server denied the request.
    """

session = self.creds.refresh_session()
                kwargs = self._configure_session(session)

                response = session.request(
                    request.method, request.url,
                    request.data,
                    request.headers,
                    **kwargs)
                return response
            except (oauth2.rfc6749.errors.InvalidGrantError,
                    oauth2.rfc6749.errors.TokenExpiredError) as err:
                msg = "Token expired or is invalid."
                raise_with_traceback(TokenExpiredError, msg, err)

        except (requests.RequestException,
                oauth2.rfc6749.errors.OAuth2Error) as err:
            msg = "Error occurred in request."
            raise_with_traceback(ClientRequestError, msg, err)
        finally:
            session.close()