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annotate pylons_app/lib/auth.py @ 366:6484963056cd

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implemented cache for repeated queries in simplehg mercurial requests
author Marcin Kuzminski <marcin@python-works.com>
date Wed, 14 Jul 2010 12:31:11 +0200
parents 5d517bbf0a0d
children 664a5b8c551a
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1 #!/usr/bin/env python
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2 # encoding: utf-8
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3 # authentication and permission libraries
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4 # Copyright (C) 2009-2010 Marcin Kuzminski <marcin@python-works.com>
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5
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6 # This program is free software; you can redistribute it and/or
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7 # modify it under the terms of the GNU General Public License
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8 # as published by the Free Software Foundation; version 2
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9 # of the License or (at your opinion) any later version of the license.
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10 #
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11 # This program is distributed in the hope that it will be useful,
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12 # but WITHOUT ANY WARRANTY; without even the implied warranty of
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13 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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14 # GNU General Public License for more details.
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15 #
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16 # You should have received a copy of the GNU General Public License
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17 # along with this program; if not, write to the Free Software
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18 # Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
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19 # MA 02110-1301, USA.
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20 """
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21 Created on April 4, 2010
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22
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23 @author: marcink
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24 """
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25 from beaker.cache import cache_region
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26 from functools import wraps
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27 from pylons import config, session, url, request
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28 from pylons.controllers.util import abort, redirect
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29 from pylons_app.lib.utils import get_repo_slug
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30 from pylons_app.model import meta
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31 from pylons_app.model.db import User, Repo2Perm, Repository, Permission
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32 from sqlalchemy.exc import OperationalError
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33 from sqlalchemy.orm.exc import NoResultFound, MultipleResultsFound
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34 import crypt
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35 import logging
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36
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37 log = logging.getLogger(__name__)
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38
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39 def get_crypt_password(password):
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40 """
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41 Cryptographic function used for password hashing
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42 @param password: password to hash
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43 """
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44 return crypt.crypt(password, '6a')
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45
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46
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47 @cache_region('super_short_term', 'cached_user')
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48 def get_user_cached(username):
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49 sa = meta.Session
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50 user = sa.query(User).filter(User.username == username).one()
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51 return user
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52
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53 def authfunc(environ, username, password):
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54 password_crypt = get_crypt_password(password)
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55 try:
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56 user = get_user_cached(username)
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57 except (NoResultFound, MultipleResultsFound, OperationalError) as e:
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58 log.error(e)
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59 user = None
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60
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61 if user:
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62 if user.active:
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63 if user.username == username and user.password == password_crypt:
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64 log.info('user %s authenticated correctly', username)
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65 return True
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66 else:
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67 log.error('user %s is disabled', username)
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69 return False
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70
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71 class AuthUser(object):
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72 """
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73 A simple object that handles a mercurial username for authentication
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74 """
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75 def __init__(self):
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76 self.username = 'None'
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77 self.user_id = None
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78 self.is_authenticated = False
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79 self.is_admin = False
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80 self.permissions = {}
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81
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82
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83 def set_available_permissions(config):
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84 """
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85 This function will propagate pylons globals with all available defined
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86 permission given in db. We don't wannt to check each time from db for new
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87 permissions since adding a new permission also requires application restart
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88 ie. to decorate new views with the newly created permission
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89 @param config:
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90 """
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91 log.info('getting information about all available permissions')
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92 sa = meta.Session
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93 all_perms = sa.query(Permission).all()
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94 config['available_permissions'] = [x.permission_name for x in all_perms]
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95
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96 def set_base_path(config):
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97 config['base_path'] = config['pylons.app_globals'].base_path
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98
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99 def fill_perms(user):
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100 sa = meta.Session
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101 user.permissions['repositories'] = {}
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102
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103 #first fetch default permissions
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104 default_perms = sa.query(Repo2Perm, Repository, Permission)\
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105 .join((Repository, Repo2Perm.repository == Repository.repo_name))\
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106 .join((Permission, Repo2Perm.permission_id == Permission.permission_id))\
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107 .filter(Repo2Perm.user_id == sa.query(User).filter(User.username ==
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108 'default').one().user_id).all()
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109
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110 if user.is_admin:
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111 user.permissions['global'] = set(['hg.admin'])
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112 #admin have all rights full
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113 for perm in default_perms:
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114 p = 'repository.admin'
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115 user.permissions['repositories'][perm.Repo2Perm.repository] = p
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116
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117 else:
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118 user.permissions['global'] = set()
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119 for perm in default_perms:
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120 if perm.Repository.private:
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121 #disable defaults for private repos,
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122 p = 'repository.none'
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123 elif perm.Repository.user_id == user.user_id:
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124 #set admin if owner
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125 p = 'repository.admin'
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126 else:
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127 p = perm.Permission.permission_name
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128
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129 user.permissions['repositories'][perm.Repo2Perm.repository] = p
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130
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131
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132 user_perms = sa.query(Repo2Perm, Permission, Repository)\
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133 .join((Repository, Repo2Perm.repository == Repository.repo_name))\
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134 .join((Permission, Repo2Perm.permission_id == Permission.permission_id))\
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135 .filter(Repo2Perm.user_id == user.user_id).all()
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136 #overwrite userpermissions with defaults
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137 for perm in user_perms:
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138 #set write if owner
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139 if perm.Repository.user_id == user.user_id:
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140 p = 'repository.write'
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141 else:
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142 p = perm.Permission.permission_name
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143 user.permissions['repositories'][perm.Repo2Perm.repository] = p
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144 return user
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145
312
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146 def get_user(session):
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147 """
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148 Gets user from session, and wraps permissions into user
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149 @param session:
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150 """
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151 user = session.get('hg_app_user', AuthUser())
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152
312
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153 if user.is_authenticated:
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154 user = fill_perms(user)
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155
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156 session['hg_app_user'] = user
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157 session.save()
312
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158 return user
239
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159
190
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160 #===============================================================================
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161 # CHECK DECORATORS
190
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162 #===============================================================================
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163 class LoginRequired(object):
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164 """
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165 Must be logged in to execute this function else redirect to login page
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166 """
329
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167
190
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168 def __call__(self, func):
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169 @wraps(func)
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170 def _wrapper(*fargs, **fkwargs):
199
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171 user = session.get('hg_app_user', AuthUser())
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172 log.debug('Checking login required for user:%s', user.username)
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173 if user.is_authenticated:
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174 log.debug('user %s is authenticated', user.username)
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175 func(*fargs)
190
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176 else:
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177 log.warn('user %s not authenticated', user.username)
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178 log.debug('redirecting to login page')
190
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179 return redirect(url('login_home'))
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180
190
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181 return _wrapper
239
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182
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183 class PermsDecorator(object):
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184 """
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185 Base class for decorators
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186 """
239
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187
329
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188 def __init__(self, *required_perms):
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189 available_perms = config['available_permissions']
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190 for perm in required_perms:
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191 if perm not in available_perms:
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192 raise Exception("'%s' permission is not defined" % perm)
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193 self.required_perms = set(required_perms)
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194 self.user_perms = None
239
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195
329
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196 def __call__(self, func):
239
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197 @wraps(func)
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198 def _wrapper(*fargs, **fkwargs):
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199 self.user_perms = session.get('hg_app_user', AuthUser()).permissions
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200 log.debug('checking %s permissions %s for %s',
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201 self.__class__.__name__, self.required_perms, func.__name__)
239
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202
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203 if self.check_permissions():
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204 log.debug('Permission granted for %s', func.__name__)
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205 return func(*fargs)
239
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206
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207 else:
329
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208 log.warning('Permission denied for %s', func.__name__)
239
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209 #redirect with forbidden ret code
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210 return abort(403)
239
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211 return _wrapper
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212
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213
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214 def check_permissions(self):
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215 """
329
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216 Dummy function for overriding
239
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217 """
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218 raise Exception('You have to write this function in child class')
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219
329
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220 class HasPermissionAllDecorator(PermsDecorator):
239
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221 """
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222 Checks for access permission for all given predicates. All of them have to
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223 be meet in order to fulfill the request
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224 """
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225
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226 def check_permissions(self):
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227 if self.required_perms.issubset(self.user_perms.get('global')):
239
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228 return True
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229 return False
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230
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231
329
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232 class HasPermissionAnyDecorator(PermsDecorator):
239
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233 """
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234 Checks for access permission for any of given predicates. In order to
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235 fulfill the request any of predicates must be meet
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236 """
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237
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238 def check_permissions(self):
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239 if self.required_perms.intersection(self.user_perms.get('global')):
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240 return True
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241 return False
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242
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243 class HasRepoPermissionAllDecorator(PermsDecorator):
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244 """
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245 Checks for access permission for all given predicates for specific
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246 repository. All of them have to be meet in order to fulfill the request
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247 """
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248
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249 def check_permissions(self):
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250 repo_name = get_repo_slug(request)
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251 try:
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252 user_perms = set([self.user_perms['repositories'][repo_name]])
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253 except KeyError:
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254 return False
329
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255 if self.required_perms.issubset(user_perms):
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256 return True
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257 return False
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258
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259
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260 class HasRepoPermissionAnyDecorator(PermsDecorator):
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261 """
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262 Checks for access permission for any of given predicates for specific
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263 repository. In order to fulfill the request any of predicates must be meet
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264 """
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265
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266 def check_permissions(self):
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267 repo_name = get_repo_slug(request)
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268
361
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269 try:
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270 user_perms = set([self.user_perms['repositories'][repo_name]])
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271 except KeyError:
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272 return False
329
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273 if self.required_perms.intersection(user_perms):
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274 return True
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275 return False
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276 #===============================================================================
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277 # CHECK FUNCTIONS
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278 #===============================================================================
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279
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280 class PermsFunction(object):
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281 """
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282 Base function for other check functions
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283 """
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284
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285 def __init__(self, *perms):
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286 available_perms = config['available_permissions']
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287
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288 for perm in perms:
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289 if perm not in available_perms:
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290 raise Exception("'%s' permission in not defined" % perm)
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291 self.required_perms = set(perms)
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292 self.user_perms = None
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293 self.granted_for = ''
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294 self.repo_name = None
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295
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296 def __call__(self, check_Location=''):
354
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297 user = session.get('hg_app_user', False)
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298 if not user:
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299 return False
329
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300 self.user_perms = user.permissions
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301 self.granted_for = user.username
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302 log.debug('checking %s %s', self.__class__.__name__, self.required_perms)
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303
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304 if self.check_permissions():
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305 log.debug('Permission granted for %s @%s', self.granted_for,
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306 check_Location)
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307 return True
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308
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309 else:
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310 log.warning('Permission denied for %s @%s', self.granted_for,
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311 check_Location)
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312 return False
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313
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314 def check_permissions(self):
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315 """
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316 Dummy function for overriding
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317 """
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318 raise Exception('You have to write this function in child class')
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319
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320 class HasPermissionAll(PermsFunction):
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321 def check_permissions(self):
361
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322 if self.required_perms.issubset(self.user_perms.get('global')):
329
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323 return True
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324 return False
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325
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326 class HasPermissionAny(PermsFunction):
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327 def check_permissions(self):
361
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328 if self.required_perms.intersection(self.user_perms.get('global')):
329
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329 return True
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330 return False
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331
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332 class HasRepoPermissionAll(PermsFunction):
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333
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334 def __call__(self, repo_name=None, check_Location=''):
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335 self.repo_name = repo_name
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336 return super(HasRepoPermissionAll, self).__call__(check_Location)
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337
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338 def check_permissions(self):
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339 if not self.repo_name:
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340 self.repo_name = get_repo_slug(request)
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341
361
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342 try:
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343 self.user_perms = set([self.user_perms['repositories']\
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344 [self.repo_name]])
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345 except KeyError:
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346 return False
329
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347 self.granted_for = self.repo_name
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348 if self.required_perms.issubset(self.user_perms):
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349 return True
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350 return False
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351
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352 class HasRepoPermissionAny(PermsFunction):
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353
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354
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355 def __call__(self, repo_name=None, check_Location=''):
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356 self.repo_name = repo_name
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357 return super(HasRepoPermissionAny, self).__call__(check_Location)
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358
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359 def check_permissions(self):
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360 if not self.repo_name:
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361 self.repo_name = get_repo_slug(request)
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362
361
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363 try:
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364 self.user_perms = set([self.user_perms['repositories']\
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365 [self.repo_name]])
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366 except KeyError:
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367 return False
329
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368 self.granted_for = self.repo_name
239
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369 if self.required_perms.intersection(self.user_perms):
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370 return True
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371 return False
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372
329
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373 #===============================================================================
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374 # SPECIAL VERSION TO HANDLE MIDDLEWARE AUTH
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375 #===============================================================================
239
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376
329
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377 class HasPermissionAnyMiddleware(object):
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378 def __init__(self, *perms):
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379 self.required_perms = set(perms)
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380
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381 def __call__(self, user, repo_name):
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382 usr = AuthUser()
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383 usr.user_id = user.user_id
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384 usr.username = user.username
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385 usr.is_admin = user.admin
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386
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387 try:
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388 self.user_perms = set([fill_perms(usr)\
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389 .permissions['repositories'][repo_name]])
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390 except:
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391 self.user_perms = set()
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392 self.granted_for = ''
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393 self.username = user.username
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394 self.repo_name = repo_name
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395 return self.check_permissions()
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396
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397 def check_permissions(self):
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398 log.debug('checking mercurial protocol '
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399 'permissions for user:%s repository:%s',
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400 self.username, self.repo_name)
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401 if self.required_perms.intersection(self.user_perms):
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402 log.debug('permission granted')
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403 return True
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404 log.debug('permission denied')
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405 return False