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annotate pylons_app/lib/auth.py @ 409:bd8b25ad058d

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Fixed decorators bug when using them with keyworded arguments,new implementation takes new approach that is more flexible
author Marcin Kuzminski <marcin@python-works.com>
date Sat, 31 Jul 2010 18:47:43 +0200
parents 5cd6616b8673
children ca54622e39a1
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rev   line source
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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 from beaker.cache import cache_region
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21 from pylons import config, session, url, request
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22 from pylons.controllers.util import abort, redirect
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23 from pylons_app.lib.utils import get_repo_slug
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24 from pylons_app.model import meta
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25 from pylons_app.model.db import User, Repo2Perm, Repository, Permission
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26 from sqlalchemy.exc import OperationalError
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27 from sqlalchemy.orm.exc import NoResultFound, MultipleResultsFound
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28 import crypt
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29 from decorator import decorator
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30 import logging
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31 """
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32 Created on April 4, 2010
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33
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34 @author: marcink
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35 """
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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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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 try:
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51 user = sa.query(User).filter(User.username == username).one()
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52 finally:
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53 meta.Session.remove()
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54 return user
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55
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56 def authfunc(environ, username, password):
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57 password_crypt = get_crypt_password(password)
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58 try:
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59 user = get_user_cached(username)
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60 except (NoResultFound, MultipleResultsFound, OperationalError) as e:
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61 log.error(e)
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62 user = None
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63
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64 if user:
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65 if user.active:
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66 if user.username == username and user.password == password_crypt:
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67 log.info('user %s authenticated correctly', username)
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68 return True
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69 else:
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70 log.error('user %s is disabled', username)
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72 return False
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73
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74 class AuthUser(object):
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75 """
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76 A simple object that handles a mercurial username for authentication
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77 """
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78 def __init__(self):
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79 self.username = 'None'
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80 self.name = ''
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81 self.lastname = ''
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82 self.user_id = None
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83 self.is_authenticated = False
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84 self.is_admin = False
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85 self.permissions = {}
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86
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87
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88 def set_available_permissions(config):
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89 """
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90 This function will propagate pylons globals with all available defined
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91 permission given in db. We don't wannt to check each time from db for new
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92 permissions since adding a new permission also requires application restart
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93 ie. to decorate new views with the newly created permission
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94 @param config:
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95 """
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96 log.info('getting information about all available permissions')
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97 try:
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98 sa = meta.Session
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99 all_perms = sa.query(Permission).all()
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100 finally:
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101 meta.Session.remove()
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102
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103 config['available_permissions'] = [x.permission_name for x in all_perms]
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104
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105 def set_base_path(config):
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106 config['base_path'] = config['pylons.app_globals'].base_path
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107
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108 def fill_data(user):
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109 """
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110 Fills user data with those from database
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111 @param user:
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112 """
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113 sa = meta.Session
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114 dbuser = sa.query(User).get(user.user_id)
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115
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116 user.username = dbuser.username
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117 user.is_admin = dbuser.admin
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118 user.name = dbuser.name
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119 user.lastname = dbuser.lastname
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120
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121 meta.Session.remove()
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122 return user
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123
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124 def fill_perms(user):
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125 """
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126 Fills user permission attribute with permissions taken from database
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127 @param user:
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128 """
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129
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130 sa = meta.Session
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131 user.permissions['repositories'] = {}
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132 user.permissions['global'] = set()
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134 #first fetch default permissions
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135 default_perms = sa.query(Repo2Perm, Repository, Permission)\
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136 .join((Repository, Repo2Perm.repository_id == Repository.repo_id))\
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137 .join((Permission, Repo2Perm.permission_id == Permission.permission_id))\
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138 .filter(Repo2Perm.user_id == sa.query(User).filter(User.username ==
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139 'default').one().user_id).all()
239
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140
329
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141 if user.is_admin:
401
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142 user.permissions['global'].add('hg.admin')
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143 #admin have all rights full
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144 for perm in default_perms:
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145 p = 'repository.admin'
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146 user.permissions['repositories'][perm.Repo2Perm.repository.repo_name] = p
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147
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148 else:
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149 user.permissions['global'].add('repository.create')
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150 for perm in default_perms:
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151 if perm.Repository.private:
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152 #disable defaults for private repos,
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153 p = 'repository.none'
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154 elif perm.Repository.user_id == user.user_id:
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155 #set admin if owner
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156 p = 'repository.admin'
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157 else:
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158 p = perm.Permission.permission_name
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159
393
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160 user.permissions['repositories'][perm.Repo2Perm.repository.repo_name] = p
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161
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162
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163 user_perms = sa.query(Repo2Perm, Permission, Repository)\
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164 .join((Repository, Repo2Perm.repository_id == Repository.repo_id))\
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165 .join((Permission, Repo2Perm.permission_id == Permission.permission_id))\
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166 .filter(Repo2Perm.user_id == user.user_id).all()
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167 #overwrite userpermissions with defaults
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168 for perm in user_perms:
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169 #set write if owner
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170 if perm.Repository.user_id == user.user_id:
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171 p = 'repository.write'
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172 else:
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173 p = perm.Permission.permission_name
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174 user.permissions['repositories'][perm.Repo2Perm.repository.repo_name] = p
374
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175 meta.Session.remove()
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176 return user
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177
312
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178 def get_user(session):
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179 """
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180 Gets user from session, and wraps permissions into user
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181 @param session:
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182 """
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183 user = session.get('hg_app_user', AuthUser())
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184 if user.is_authenticated:
401
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185 user = fill_data(user)
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186 user = fill_perms(user)
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187 session['hg_app_user'] = user
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188 session.save()
312
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189 return user
239
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190
190
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191 #===============================================================================
329
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192 # CHECK DECORATORS
190
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193 #===============================================================================
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194 class LoginRequired(object):
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195 """Must be logged in to execute this function else redirect to login page"""
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196
190
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197 def __call__(self, func):
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198 return decorator(self.__wrapper, func)
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199
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200 def __wrapper(self, func, *fargs, **fkwargs):
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201 user = session.get('hg_app_user', AuthUser())
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202 log.debug('Checking login required for user:%s', user.username)
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203 if user.is_authenticated:
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204 log.debug('user %s is authenticated', user.username)
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205 return func(*fargs, **fkwargs)
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206 else:
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207 log.warn('user %s not authenticated', user.username)
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208 log.debug('redirecting to login page')
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209 return redirect(url('login_home'))
239
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210
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211 class PermsDecorator(object):
409
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212 """Base class for decorators"""
239
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213
329
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214 def __init__(self, *required_perms):
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215 available_perms = config['available_permissions']
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216 for perm in required_perms:
239
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217 if perm not in available_perms:
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218 raise Exception("'%s' permission is not defined" % perm)
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219 self.required_perms = set(required_perms)
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220 self.user_perms = None
239
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221
329
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222 def __call__(self, func):
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223 return decorator(self.__wrapper, func)
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224
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225
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226 def __wrapper(self, func, *fargs, **fkwargs):
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227 # _wrapper.__name__ = func.__name__
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228 # _wrapper.__dict__.update(func.__dict__)
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229 # _wrapper.__doc__ = func.__doc__
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230
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231 self.user_perms = session.get('hg_app_user', AuthUser()).permissions
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232 log.debug('checking %s permissions %s for %s',
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233 self.__class__.__name__, self.required_perms, func.__name__)
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234
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235 if self.check_permissions():
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236 log.debug('Permission granted for %s', func.__name__)
239
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237
409
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238 return func(*fargs, **fkwargs)
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239
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240 else:
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241 log.warning('Permission denied for %s', func.__name__)
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242 #redirect with forbidden ret code
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243 return abort(403)
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244
239
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245
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246
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247 def check_permissions(self):
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248 """Dummy function for overriding"""
239
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249 raise Exception('You have to write this function in child class')
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250
329
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251 class HasPermissionAllDecorator(PermsDecorator):
409
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252 """Checks for access permission for all given predicates. All of them
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253 have to be meet in order to fulfill the request
239
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254 """
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255
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256 def check_permissions(self):
361
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257 if self.required_perms.issubset(self.user_perms.get('global')):
239
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258 return True
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259 return False
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260
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261
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262 class HasPermissionAnyDecorator(PermsDecorator):
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263 """Checks for access permission for any of given predicates. In order to
239
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264 fulfill the request any of predicates must be meet
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265 """
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266
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267 def check_permissions(self):
361
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268 if self.required_perms.intersection(self.user_perms.get('global')):
329
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269 return True
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270 return False
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271
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272 class HasRepoPermissionAllDecorator(PermsDecorator):
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273 """Checks for access permission for all given predicates for specific
329
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274 repository. All of them have to be meet in order to fulfill the request
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275 """
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276
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277 def check_permissions(self):
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278 repo_name = get_repo_slug(request)
361
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279 try:
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280 user_perms = set([self.user_perms['repositories'][repo_name]])
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281 except KeyError:
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282 return False
329
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283 if self.required_perms.issubset(user_perms):
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284 return True
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285 return False
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286
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287
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288 class HasRepoPermissionAnyDecorator(PermsDecorator):
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289 """Checks for access permission for any of given predicates for specific
329
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290 repository. In order to fulfill the request any of predicates must be meet
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291 """
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292
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293 def check_permissions(self):
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294 repo_name = get_repo_slug(request)
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295
361
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296 try:
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297 user_perms = set([self.user_perms['repositories'][repo_name]])
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298 except KeyError:
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299 return False
329
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300 if self.required_perms.intersection(user_perms):
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301 return True
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302 return False
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303 #===============================================================================
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304 # CHECK FUNCTIONS
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305 #===============================================================================
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306
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307 class PermsFunction(object):
409
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308 """Base function for other check functions"""
329
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309
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310 def __init__(self, *perms):
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311 available_perms = config['available_permissions']
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312
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313 for perm in perms:
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314 if perm not in available_perms:
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315 raise Exception("'%s' permission in not defined" % perm)
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316 self.required_perms = set(perms)
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317 self.user_perms = None
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318 self.granted_for = ''
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319 self.repo_name = None
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320
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321 def __call__(self, check_Location=''):
354
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322 user = session.get('hg_app_user', False)
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323 if not user:
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324 return False
329
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325 self.user_perms = user.permissions
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326 self.granted_for = user.username
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327 log.debug('checking %s %s', self.__class__.__name__, self.required_perms)
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328
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329 if self.check_permissions():
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330 log.debug('Permission granted for %s @%s', self.granted_for,
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331 check_Location)
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332 return True
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333
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334 else:
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335 log.warning('Permission denied for %s @%s', self.granted_for,
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336 check_Location)
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337 return False
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338
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339 def check_permissions(self):
409
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340 """Dummy function for overriding"""
329
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341 raise Exception('You have to write this function in child class')
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342
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343 class HasPermissionAll(PermsFunction):
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344 def check_permissions(self):
361
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345 if self.required_perms.issubset(self.user_perms.get('global')):
329
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346 return True
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347 return False
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348
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349 class HasPermissionAny(PermsFunction):
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350 def check_permissions(self):
361
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351 if self.required_perms.intersection(self.user_perms.get('global')):
329
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352 return True
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353 return False
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354
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355 class HasRepoPermissionAll(PermsFunction):
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356
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357 def __call__(self, repo_name=None, check_Location=''):
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358 self.repo_name = repo_name
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359 return super(HasRepoPermissionAll, self).__call__(check_Location)
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360
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361 def check_permissions(self):
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362 if not self.repo_name:
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363 self.repo_name = get_repo_slug(request)
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364
361
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365 try:
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366 self.user_perms = set([self.user_perms['repositories']\
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367 [self.repo_name]])
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368 except KeyError:
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369 return False
329
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370 self.granted_for = self.repo_name
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371 if self.required_perms.issubset(self.user_perms):
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372 return True
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373 return False
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374
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375 class HasRepoPermissionAny(PermsFunction):
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376
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377 def __call__(self, repo_name=None, check_Location=''):
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378 self.repo_name = repo_name
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379 return super(HasRepoPermissionAny, self).__call__(check_Location)
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380
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381 def check_permissions(self):
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382 if not self.repo_name:
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383 self.repo_name = get_repo_slug(request)
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384
361
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385 try:
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386 self.user_perms = set([self.user_perms['repositories']\
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387 [self.repo_name]])
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388 except KeyError:
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389 return False
329
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390 self.granted_for = self.repo_name
239
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391 if self.required_perms.intersection(self.user_perms):
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392 return True
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393 return False
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394
329
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395 #===============================================================================
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396 # SPECIAL VERSION TO HANDLE MIDDLEWARE AUTH
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397 #===============================================================================
239
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398
329
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399 class HasPermissionAnyMiddleware(object):
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400 def __init__(self, *perms):
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401 self.required_perms = set(perms)
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402
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403 def __call__(self, user, repo_name):
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404 usr = AuthUser()
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405 usr.user_id = user.user_id
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406 usr.username = user.username
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407 usr.is_admin = user.admin
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408
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409 try:
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410 self.user_perms = set([fill_perms(usr)\
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411 .permissions['repositories'][repo_name]])
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412 except:
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413 self.user_perms = set()
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414 self.granted_for = ''
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415 self.username = user.username
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416 self.repo_name = repo_name
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417 return self.check_permissions()
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418
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419 def check_permissions(self):
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420 log.debug('checking mercurial protocol '
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421 'permissions for user:%s repository:%s',
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422 self.username, self.repo_name)
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423 if self.required_perms.intersection(self.user_perms):
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424 log.debug('permission granted')
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425 return True
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426 log.debug('permission denied')
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427 return False