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# -*- coding: utf-8 -*-
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# Copyright (C) 2016-2017 RhodeCode GmbH
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#
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# This program is free software: you can redistribute it and/or modify
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# it under the terms of the GNU Affero General Public License, version 3
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# (only), as published by the Free Software Foundation.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU Affero General Public License
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# along with this program. If not, see <http://www.gnu.org/licenses/>.
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#
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# This program is dual-licensed. If you wish to learn more about the
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# RhodeCode Enterprise Edition, including its added features, Support services,
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# and proprietary license terms, please see https://rhodecode.com/licenses/
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import logging
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from pyramid import httpexceptions
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from pyramid.httpexceptions import HTTPError, HTTPInternalServerError
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from pyramid.threadlocal import get_current_request
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from rhodecode.lib.exceptions import VCSServerUnavailable
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from rhodecode.lib.vcs.exceptions import VCSCommunicationError
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log = logging.getLogger(__name__)
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class PylonsErrorHandlingMiddleware(object):
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"""
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This middleware is wrapped around the old pylons application to catch
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errors and invoke our error handling view to return a proper error page.
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"""
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def __init__(self, app, error_view, reraise=False):
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self.app = app
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self.error_view = error_view
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self._reraise = reraise
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def __call__(self, environ, start_response):
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# We need to use the pyramid request here instead of creating a custom
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# instance from the environ because this request maybe passed to the
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# error handler view which is a pyramid view and expects a pyramid
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# request which has been processed by the pyramid router.
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request = get_current_request()
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response = self.handle_request(request)
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return response(environ, start_response)
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def is_http_error(self, response):
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# webob type error responses
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return (400 <= response.status_int <= 599)
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def reraise(self):
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return self._reraise
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def handle_request(self, request):
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"""
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Calls the underlying WSGI app (typically the old RhodeCode pylons app)
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and returns the response if no error happened. In case of an error it
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invokes the error handling view to return a proper error page as
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response.
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- old webob type exceptions get converted to pyramid exceptions
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- pyramid exceptions are passed to the error handler view
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"""
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try:
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response = request.get_response(self.app)
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if self.is_http_error(response):
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response = webob_to_pyramid_http_response(response)
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return self.error_view(response, request)
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except HTTPError as e: # pyramid type exceptions
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return self.error_view(e, request)
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except Exception as e:
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if self.reraise():
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raise
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if isinstance(e, VCSCommunicationError):
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return self.error_view(VCSServerUnavailable(), request)
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return self.error_view(HTTPInternalServerError(), request)
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return response
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def webob_to_pyramid_http_response(webob_response):
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ResponseClass = httpexceptions.status_map[webob_response.status_int]
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pyramid_response = ResponseClass(webob_response.status)
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pyramid_response.status = webob_response.status
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pyramid_response.headers.update(webob_response.headers)
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if pyramid_response.headers['content-type'] == 'text/html':
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pyramid_response.headers['content-type'] = 'text/html; charset=UTF-8'
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return pyramid_response
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