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120 lines
4.4 KiB
Python
120 lines
4.4 KiB
Python
import re
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import sys
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from flask import current_app, got_request_exception
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from flask_restful import Api, http_status_message
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from werkzeug.datastructures import Headers
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from werkzeug.exceptions import HTTPException
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class ExternalApi(Api):
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def handle_error(self, e):
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"""Error handler for the API transforms a raised exception into a Flask
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response, with the appropriate HTTP status code and body.
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:param e: the raised Exception object
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:type e: Exception
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"""
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got_request_exception.send(current_app, exception=e)
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headers = Headers()
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if isinstance(e, HTTPException):
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if e.response is not None:
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resp = e.get_response()
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return resp
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status_code = e.code
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default_data = {
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'code': re.sub(r'(?<!^)(?=[A-Z])', '_', type(e).__name__).lower(),
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'message': getattr(e, 'description', http_status_message(status_code)),
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'status': status_code
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}
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if default_data['message'] and default_data['message'] == 'Failed to decode JSON object: Expecting value: line 1 column 1 (char 0)':
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default_data['message'] = 'Invalid JSON payload received or JSON payload is empty.'
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headers = e.get_response().headers
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elif isinstance(e, ValueError):
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status_code = 400
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default_data = {
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'code': 'invalid_param',
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'message': str(e),
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'status': status_code
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}
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else:
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status_code = 500
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default_data = {
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'message': http_status_message(status_code),
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}
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# Werkzeug exceptions generate a content-length header which is added
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# to the response in addition to the actual content-length header
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# https://github.com/flask-restful/flask-restful/issues/534
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remove_headers = ('Content-Length',)
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for header in remove_headers:
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headers.pop(header, None)
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data = getattr(e, 'data', default_data)
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error_cls_name = type(e).__name__
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if error_cls_name in self.errors:
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custom_data = self.errors.get(error_cls_name, {})
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custom_data = custom_data.copy()
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status_code = custom_data.get('status', 500)
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if 'message' in custom_data:
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custom_data['message'] = custom_data['message'].format(
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message=str(e.description if hasattr(e, 'description') else e)
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)
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data.update(custom_data)
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# record the exception in the logs when we have a server error of status code: 500
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if status_code and status_code >= 500:
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exc_info = sys.exc_info()
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if exc_info[1] is None:
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exc_info = None
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current_app.log_exception(exc_info)
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if status_code == 406 and self.default_mediatype is None:
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# if we are handling NotAcceptable (406), make sure that
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# make_response uses a representation we support as the
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# default mediatype (so that make_response doesn't throw
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# another NotAcceptable error).
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supported_mediatypes = list(self.representations.keys()) # only supported application/json
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fallback_mediatype = supported_mediatypes[0] if supported_mediatypes else "text/plain"
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data = {
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'code': 'not_acceptable',
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'message': data.get('message')
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}
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resp = self.make_response(
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data,
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status_code,
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headers,
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fallback_mediatype = fallback_mediatype
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)
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elif status_code == 400:
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if isinstance(data.get('message'), dict):
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param_key, param_value = list(data.get('message').items())[0]
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data = {
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'code': 'invalid_param',
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'message': param_value,
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'params': param_key
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}
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else:
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if 'code' not in data:
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data['code'] = 'unknown'
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resp = self.make_response(data, status_code, headers)
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else:
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if 'code' not in data:
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data['code'] = 'unknown'
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resp = self.make_response(data, status_code, headers)
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if status_code == 401:
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resp = self.unauthorized(resp)
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return resp
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