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#!/usr/bin/env python
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# encoding: utf-8
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# middleware to handle mercurial api calls
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# Copyright (C) 2009-2010 Marcin Kuzminski <marcin@python-works.com>
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#
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# This program is free software; you can redistribute it and/or
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# modify it under the terms of the GNU General Public License
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# as published by the Free Software Foundation; version 2
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# of the License or (at your opinion) any later version of the license.
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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 General Public License
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# along with this program; if not, write to the Free Software
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# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
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# MA 02110-1301, USA.
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"""
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Created on 2010-04-28
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@author: marcink
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SimpleHG middleware for handling mercurial protocol request (push/clone etc.)
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It's implemented with basic auth function
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"""
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from itertools import chain
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from mercurial.error import RepoError
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from mercurial.hgweb import hgweb
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from mercurial.hgweb.request import wsgiapplication
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from paste.auth.basic import AuthBasicAuthenticator
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from paste.httpheaders import REMOTE_USER, AUTH_TYPE
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from pylons_app.lib.auth import authfunc, HasPermissionAnyMiddleware, \
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get_user_cached
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from pylons_app.lib.utils import is_mercurial, make_ui, invalidate_cache, \
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check_repo_fast, ui_sections
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from webob.exc import HTTPNotFound, HTTPForbidden, HTTPInternalServerError
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from pylons_app.lib.utils import action_logger
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import logging
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import os
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import traceback
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log = logging.getLogger(__name__)
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class SimpleHg(object):
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def __init__(self, application, config):
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self.application = application
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self.config = config
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#authenticate this mercurial request using
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self.authenticate = AuthBasicAuthenticator('', authfunc)
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def __call__(self, environ, start_response):
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if not is_mercurial(environ):
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return self.application(environ, start_response)
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#===================================================================
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# AUTHENTICATE THIS MERCURIAL REQUEST
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#===================================================================
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username = REMOTE_USER(environ)
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if not username:
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self.authenticate.realm = self.config['hg_app_realm']
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result = self.authenticate(environ)
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if isinstance(result, str):
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AUTH_TYPE.update(environ, 'basic')
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REMOTE_USER.update(environ, result)
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else:
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return result.wsgi_application(environ, start_response)
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try:
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repo_name = '/'.join(environ['PATH_INFO'].split('/')[1:])
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if repo_name.endswith('/'):
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repo_name = repo_name.rstrip('/')
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except:
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log.error(traceback.format_exc())
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return HTTPInternalServerError()(environ, start_response)
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#===================================================================
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# CHECK PERMISSIONS FOR THIS REQUEST
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#===================================================================
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action = self.__get_action(environ)
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if action:
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username = self.__get_environ_user(environ)
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try:
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user = self.__get_user(username)
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except:
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log.error(traceback.format_exc())
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return HTTPInternalServerError()(environ, start_response)
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#check permissions for this repository
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if action == 'pull':
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if not HasPermissionAnyMiddleware('repository.read',
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'repository.write',
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'repository.admin')\
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(user, repo_name):
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return HTTPForbidden()(environ, start_response)
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if action == 'push':
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if not HasPermissionAnyMiddleware('repository.write',
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'repository.admin')\
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(user, repo_name):
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return HTTPForbidden()(environ, start_response)
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#log action
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proxy_key = 'HTTP_X_REAL_IP'
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def_key = 'REMOTE_ADDR'
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ipaddr = environ.get(proxy_key, environ.get(def_key, '0.0.0.0'))
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self.__log_user_action(user, action, repo_name, ipaddr)
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#===================================================================
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# MERCURIAL REQUEST HANDLING
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#===================================================================
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environ['PATH_INFO'] = '/'#since we wrap into hgweb, reset the path
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self.baseui = make_ui('db')
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self.basepath = self.config['base_path']
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self.repo_path = os.path.join(self.basepath, repo_name)
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#quick check if that dir exists...
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if check_repo_fast(repo_name, self.basepath):
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return HTTPNotFound()(environ, start_response)
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try:
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app = wsgiapplication(self.__make_app)
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except RepoError, e:
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if str(e).find('not found') != -1:
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return HTTPNotFound()(environ, start_response)
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except Exception:
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log.error(traceback.format_exc())
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return HTTPInternalServerError()(environ, start_response)
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#invalidate cache on push
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if action == 'push':
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self.__invalidate_cache(repo_name)
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messages = []
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messages.append('thank you for using hg-app')
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return self.msg_wrapper(app, environ, start_response, messages)
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else:
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return app(environ, start_response)
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def msg_wrapper(self, app, environ, start_response, messages=[]):
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"""
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Wrapper for custom messages that come out of mercurial respond messages
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is a list of messages that the user will see at the end of response
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from merurial protocol actions that involves remote answers
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@param app:
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@param environ:
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@param start_response:
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"""
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def custom_messages(msg_list):
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for msg in msg_list:
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yield msg + '\n'
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org_response = app(environ, start_response)
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return chain(org_response, custom_messages(messages))
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def __make_app(self):
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hgserve = hgweb(str(self.repo_path), baseui=self.baseui)
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return self.__load_web_settings(hgserve)
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def __get_environ_user(self, environ):
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return environ.get('REMOTE_USER')
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def __get_user(self, username):
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return get_user_cached(username)
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def __get_action(self, environ):
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"""
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Maps mercurial request commands into a pull or push command.
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@param environ:
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"""
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mapping = {'changegroup': 'pull',
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'changegroupsubset': 'pull',
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'stream_out': 'pull',
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'listkeys': 'pull',
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'unbundle': 'push',
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'pushkey': 'push', }
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for qry in environ['QUERY_STRING'].split('&'):
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if qry.startswith('cmd'):
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cmd = qry.split('=')[-1]
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if mapping.has_key(cmd):
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return mapping[cmd]
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def __log_user_action(self, user, action, repo, ipaddr):
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action_logger(user, action, repo, ipaddr)
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def __invalidate_cache(self, repo_name):
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"""we know that some change was made to repositories and we should
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invalidate the cache to see the changes right away but only for
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push requests"""
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invalidate_cache('cached_repo_list')
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invalidate_cache('full_changelog', repo_name)
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def __load_web_settings(self, hgserve):
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#set the global ui for hgserve
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hgserve.repo.ui = self.baseui
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hgrc = os.path.join(self.repo_path, '.hg', 'hgrc')
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repoui = make_ui('file', hgrc, False)
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if repoui:
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#overwrite our ui instance with the section from hgrc file
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for section in ui_sections:
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for k, v in repoui.configitems(section):
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hgserve.repo.ui.setconfig(section, k, v)
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return hgserve
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