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annotate pylons_app/lib/auth.py @ 423:16253f330094

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fixes #30. Rewrite default permissions query + some other small fixes
author Marcin Kuzminski <marcin@python-works.com>
date Wed, 25 Aug 2010 18:15:50 +0200
parents 63c697d1a631
children 55ada111bca6
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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 """
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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 pylons import config, session, url, request
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27 from pylons.controllers.util import abort, redirect
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28 from pylons_app.lib.utils import get_repo_slug
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29 from pylons_app.model import meta
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30 from pylons_app.model.db import User, RepoToPerm, Repository, Permission, \
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31 UserToPerm
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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 bcrypt
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35 from decorator import decorator
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36 import logging
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37
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38 log = logging.getLogger(__name__)
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39
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40 def get_crypt_password(password):
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41 """Cryptographic function used for password hashing based on sha1
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42 @param password: password to hash
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43 """
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44 return bcrypt.hashpw(password, bcrypt.gensalt(10))
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45
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46 def check_password(password, hashed):
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47 return bcrypt.hashpw(password, hashed) == hashed
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48
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49 @cache_region('super_short_term', 'cached_user')
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50 def get_user_cached(username):
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51 sa = meta.Session
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52 try:
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53 user = sa.query(User).filter(User.username == username).one()
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54 finally:
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55 meta.Session.remove()
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56 return user
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57
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58 def authfunc(environ, username, password):
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59 try:
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60 user = get_user_cached(username)
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61 except (NoResultFound, MultipleResultsFound, OperationalError) as e:
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62 log.error(e)
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63 user = None
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64
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65 if user:
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66 if user.active:
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67 if user.username == username and check_password(password, user.password):
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68 log.info('user %s authenticated correctly', username)
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69 return True
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70 else:
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71 log.error('user %s is disabled', username)
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73 return False
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74
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75 class AuthUser(object):
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76 """
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77 A simple object that handles a mercurial username for authentication
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78 """
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79 def __init__(self):
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80 self.username = 'None'
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81 self.name = ''
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82 self.lastname = ''
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83 self.email = ''
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84 self.user_id = None
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85 self.is_authenticated = False
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86 self.is_admin = False
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87 self.permissions = {}
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88
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89
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90 def set_available_permissions(config):
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91 """
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92 This function will propagate pylons globals with all available defined
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93 permission given in db. We don't wannt to check each time from db for new
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94 permissions since adding a new permission also requires application restart
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95 ie. to decorate new views with the newly created permission
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96 @param config:
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97 """
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98 log.info('getting information about all available permissions')
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99 try:
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100 sa = meta.Session
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101 all_perms = sa.query(Permission).all()
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102 finally:
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103 meta.Session.remove()
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104
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105 config['available_permissions'] = [x.permission_name for x in all_perms]
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106
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107 def set_base_path(config):
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108 config['base_path'] = config['pylons.app_globals'].base_path
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109
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110 def fill_data(user):
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111 """
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112 Fills user data with those from database and log out user if not present
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113 in database
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114 @param user:
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115 """
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116 sa = meta.Session
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117 dbuser = sa.query(User).get(user.user_id)
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118 if dbuser:
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119 user.username = dbuser.username
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120 user.is_admin = dbuser.admin
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121 user.name = dbuser.name
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122 user.lastname = dbuser.lastname
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123 user.email = dbuser.email
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124 else:
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125 user.is_authenticated = False
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126 meta.Session.remove()
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127 from pprint import pprint
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128 pprint(user.permissions)
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129 return user
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130
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131 def fill_perms(user):
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132 """
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133 Fills user permission attribute with permissions taken from database
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134 @param user:
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135 """
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136
316
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137 sa = meta.Session
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138 user.permissions['repositories'] = {}
371
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139 user.permissions['global'] = set()
316
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140
417
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141 #===========================================================================
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142 # fetch default permissions
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143 #===========================================================================
423
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144 default_perms = sa.query(RepoToPerm, Repository, Permission)\
399
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145 .join((Repository, RepoToPerm.repository_id == Repository.repo_id))\
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146 .join((Permission, RepoToPerm.permission_id == Permission.permission_id))\
423
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147 .filter(RepoToPerm.user == sa.query(User).filter(User.username ==
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148 'default').scalar()).all()
417
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149
316
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150 if user.is_admin:
417
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151 #=======================================================================
423
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152 # #admin have all default rights set to admin
417
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153 #=======================================================================
371
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154 user.permissions['global'].add('hg.admin')
417
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155
316
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156 for perm in default_perms:
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157 p = 'repository.admin'
399
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158 user.permissions['repositories'][perm.RepoToPerm.repository.repo_name] = p
316
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159
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160 else:
417
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161 #=======================================================================
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162 # set default permissions
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163 #=======================================================================
412
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164
417
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165 #default global
423
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166 default_global_perms = sa.query(UserToPerm)\
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167 .filter(UserToPerm.user == sa.query(User).filter(User.username ==
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168 'default').one())
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169
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170 for perm in default_global_perms:
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171 user.permissions['global'].add(perm.permission.permission_name)
418
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172
417
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173 #default repositories
316
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174 for perm in default_perms:
380
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175 if perm.Repository.private and not perm.Repository.user_id == user.user_id:
316
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176 #disable defaults for private repos,
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177 p = 'repository.none'
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178 elif perm.Repository.user_id == user.user_id:
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179 #set admin if owner
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180 p = 'repository.admin'
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181 else:
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182 p = perm.Permission.permission_name
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183
399
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184 user.permissions['repositories'][perm.RepoToPerm.repository.repo_name] = p
316
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185
417
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186 #=======================================================================
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187 # #overwrite default with user permissions if any
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188 #=======================================================================
423
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189 user_perms = sa.query(RepoToPerm, Permission, Repository)\
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190 .join((Repository, RepoToPerm.repository_id == Repository.repo_id))\
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191 .join((Permission, RepoToPerm.permission_id == Permission.permission_id))\
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192 .filter(RepoToPerm.user_id == user.user_id).all()
417
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193
316
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194 for perm in user_perms:
417
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195 if perm.Repository.user_id == user.user_id:#set admin if owner
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196 p = 'repository.admin'
316
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197 else:
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198 p = perm.Permission.permission_name
399
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199 user.permissions['repositories'][perm.RepoToPerm.repository.repo_name] = p
350
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200 meta.Session.remove()
316
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201 return user
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202
299
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203 def get_user(session):
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204 """
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205 Gets user from session, and wraps permissions into user
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206 @param session:
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207 """
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208 user = session.get('hg_app_user', AuthUser())
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209 if user.is_authenticated:
371
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210 user = fill_data(user)
412
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211 user = fill_perms(user)
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212 session['hg_app_user'] = user
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213 session.save()
299
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214 return user
239
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215
190
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216 #===============================================================================
316
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217 # CHECK DECORATORS
190
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218 #===============================================================================
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219 class LoginRequired(object):
377
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220 """Must be logged in to execute this function else redirect to login page"""
316
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221
190
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222 def __call__(self, func):
377
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223 return decorator(self.__wrapper, func)
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224
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225 def __wrapper(self, func, *fargs, **fkwargs):
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226 user = session.get('hg_app_user', AuthUser())
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227 log.debug('Checking login required for user:%s', user.username)
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228 if user.is_authenticated:
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229 log.debug('user %s is authenticated', user.username)
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230 return func(*fargs, **fkwargs)
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231 else:
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232 log.warn('user %s not authenticated', user.username)
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233 log.debug('redirecting to login page')
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234 return redirect(url('login_home'))
239
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235
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236 class PermsDecorator(object):
377
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237 """Base class for decorators"""
239
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238
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239 def __init__(self, *required_perms):
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240 available_perms = config['available_permissions']
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241 for perm in required_perms:
239
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242 if perm not in available_perms:
316
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243 raise Exception("'%s' permission is not defined" % perm)
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244 self.required_perms = set(required_perms)
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245 self.user_perms = None
239
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246
316
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247 def __call__(self, func):
377
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248 return decorator(self.__wrapper, func)
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249
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250
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251 def __wrapper(self, func, *fargs, **fkwargs):
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252 # _wrapper.__name__ = func.__name__
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253 # _wrapper.__dict__.update(func.__dict__)
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254 # _wrapper.__doc__ = func.__doc__
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255
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256 self.user_perms = session.get('hg_app_user', AuthUser()).permissions
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257 log.debug('checking %s permissions %s for %s',
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258 self.__class__.__name__, self.required_perms, func.__name__)
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259
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260 if self.check_permissions():
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261 log.debug('Permission granted for %s', func.__name__)
239
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262
377
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263 return func(*fargs, **fkwargs)
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264
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265 else:
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266 log.warning('Permission denied for %s', func.__name__)
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267 #redirect with forbidden ret code
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268 return abort(403)
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269
239
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270
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271
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272 def check_permissions(self):
377
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273 """Dummy function for overriding"""
239
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274 raise Exception('You have to write this function in child class')
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275
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276 class HasPermissionAllDecorator(PermsDecorator):
377
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277 """Checks for access permission for all given predicates. All of them
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278 have to be meet in order to fulfill the request
239
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279 """
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280
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281 def check_permissions(self):
339
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282 if self.required_perms.issubset(self.user_perms.get('global')):
239
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283 return True
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284 return False
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285
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286
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287 class HasPermissionAnyDecorator(PermsDecorator):
377
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288 """Checks for access permission for any of given predicates. In order to
239
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289 fulfill the request any of predicates must be meet
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290 """
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291
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292 def check_permissions(self):
339
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293 if self.required_perms.intersection(self.user_perms.get('global')):
316
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294 return True
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295 return False
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296
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297 class HasRepoPermissionAllDecorator(PermsDecorator):
377
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298 """Checks for access permission for all given predicates for specific
316
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299 repository. All of them have to be meet in order to fulfill the request
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300 """
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301
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302 def check_permissions(self):
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303 repo_name = get_repo_slug(request)
339
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304 try:
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305 user_perms = set([self.user_perms['repositories'][repo_name]])
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306 except KeyError:
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307 return False
316
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308 if self.required_perms.issubset(user_perms):
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309 return True
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310 return False
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311
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312
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313 class HasRepoPermissionAnyDecorator(PermsDecorator):
377
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314 """Checks for access permission for any of given predicates for specific
316
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315 repository. In order to fulfill the request any of predicates must be meet
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316 """
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317
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318 def check_permissions(self):
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319 repo_name = get_repo_slug(request)
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320
339
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321 try:
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322 user_perms = set([self.user_perms['repositories'][repo_name]])
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323 except KeyError:
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324 return False
316
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325 if self.required_perms.intersection(user_perms):
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326 return True
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327 return False
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328 #===============================================================================
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329 # CHECK FUNCTIONS
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330 #===============================================================================
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331
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332 class PermsFunction(object):
377
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333 """Base function for other check functions"""
316
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334
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335 def __init__(self, *perms):
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336 available_perms = config['available_permissions']
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337
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338 for perm in perms:
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339 if perm not in available_perms:
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340 raise Exception("'%s' permission in not defined" % perm)
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341 self.required_perms = set(perms)
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342 self.user_perms = None
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343 self.granted_for = ''
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344 self.repo_name = None
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345
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346 def __call__(self, check_Location=''):
333
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347 user = session.get('hg_app_user', False)
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348 if not user:
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349 return False
316
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350 self.user_perms = user.permissions
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351 self.granted_for = user.username
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352 log.debug('checking %s %s', self.__class__.__name__, self.required_perms)
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353
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354 if self.check_permissions():
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355 log.debug('Permission granted for %s @%s', self.granted_for,
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356 check_Location)
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357 return True
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358
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359 else:
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360 log.warning('Permission denied for %s @%s', self.granted_for,
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361 check_Location)
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362 return False
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363
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364 def check_permissions(self):
377
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365 """Dummy function for overriding"""
316
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366 raise Exception('You have to write this function in child class')
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367
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368 class HasPermissionAll(PermsFunction):
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369 def check_permissions(self):
339
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370 if self.required_perms.issubset(self.user_perms.get('global')):
316
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371 return True
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372 return False
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373
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374 class HasPermissionAny(PermsFunction):
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375 def check_permissions(self):
339
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376 if self.required_perms.intersection(self.user_perms.get('global')):
316
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377 return True
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378 return False
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379
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380 class HasRepoPermissionAll(PermsFunction):
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381
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382 def __call__(self, repo_name=None, check_Location=''):
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383 self.repo_name = repo_name
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384 return super(HasRepoPermissionAll, self).__call__(check_Location)
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385
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386 def check_permissions(self):
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387 if not self.repo_name:
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388 self.repo_name = get_repo_slug(request)
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389
339
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390 try:
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391 self.user_perms = set([self.user_perms['repositories']\
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392 [self.repo_name]])
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393 except KeyError:
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394 return False
316
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395 self.granted_for = self.repo_name
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396 if self.required_perms.issubset(self.user_perms):
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397 return True
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398 return False
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399
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400 class HasRepoPermissionAny(PermsFunction):
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401
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402 def __call__(self, repo_name=None, check_Location=''):
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403 self.repo_name = repo_name
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404 return super(HasRepoPermissionAny, self).__call__(check_Location)
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405
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406 def check_permissions(self):
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407 if not self.repo_name:
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408 self.repo_name = get_repo_slug(request)
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409
339
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410 try:
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411 self.user_perms = set([self.user_perms['repositories']\
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412 [self.repo_name]])
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413 except KeyError:
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414 return False
316
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415 self.granted_for = self.repo_name
239
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416 if self.required_perms.intersection(self.user_perms):
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417 return True
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418 return False
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419
316
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420 #===============================================================================
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421 # SPECIAL VERSION TO HANDLE MIDDLEWARE AUTH
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422 #===============================================================================
239
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423
316
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424 class HasPermissionAnyMiddleware(object):
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425 def __init__(self, *perms):
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426 self.required_perms = set(perms)
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427
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428 def __call__(self, user, repo_name):
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429 usr = AuthUser()
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430 usr.user_id = user.user_id
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431 usr.username = user.username
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432 usr.is_admin = user.admin
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433
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434 try:
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435 self.user_perms = set([fill_perms(usr)\
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436 .permissions['repositories'][repo_name]])
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437 except:
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438 self.user_perms = set()
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439 self.granted_for = ''
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440 self.username = user.username
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441 self.repo_name = repo_name
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442 return self.check_permissions()
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443
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444 def check_permissions(self):
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445 log.debug('checking mercurial protocol '
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446 'permissions for user:%s repository:%s',
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447 self.username, self.repo_name)
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448 if self.required_perms.intersection(self.user_perms):
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449 log.debug('permission granted')
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450 return True
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451 log.debug('permission denied')
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452 return False