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annotate pylons_app/lib/auth.py @ 393:a26f48ad7a8a

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fixes issue #16 reimplementation of database repository, for using generic pk instead of repo naming as pk. Which caused to many problems. Fixed issue when redirecting after repo name change to 404. Removed update hook from basic app setup
author Marcin Kuzminski <marcin@python-works.com>
date Tue, 27 Jul 2010 14:53:22 +0200
parents 5bbcc0cac389
children 5cd6616b8673
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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 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 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_perms(user):
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109 """
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110 Fills user permission attribute with permissions taken from database
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111 @param user:
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112 """
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113
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114 sa = meta.Session
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115 user.permissions['repositories'] = {}
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116
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117 #first fetch default permissions
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118 default_perms = sa.query(Repo2Perm, Repository, Permission)\
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119 .join((Repository, Repo2Perm.repository_id == Repository.repo_id))\
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120 .join((Permission, Repo2Perm.permission_id == Permission.permission_id))\
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121 .filter(Repo2Perm.user_id == sa.query(User).filter(User.username ==
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122 'default').one().user_id).all()
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123
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124 if user.is_admin:
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125 user.permissions['global'] = set(['hg.admin'])
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126 #admin have all rights full
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127 for perm in default_perms:
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128 p = 'repository.admin'
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129 user.permissions['repositories'][perm.Repo2Perm.repository.repo_name] = p
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130
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131 else:
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132 user.permissions['global'] = set()
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133 for perm in default_perms:
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134 if perm.Repository.private:
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135 #disable defaults for private repos,
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136 p = 'repository.none'
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137 elif perm.Repository.user_id == user.user_id:
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138 #set admin if owner
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139 p = 'repository.admin'
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140 else:
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141 p = perm.Permission.permission_name
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142
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143 user.permissions['repositories'][perm.Repo2Perm.repository.repo_name] = p
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144
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145
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146 user_perms = sa.query(Repo2Perm, Permission, Repository)\
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147 .join((Repository, Repo2Perm.repository_id == Repository.repo_id))\
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148 .join((Permission, Repo2Perm.permission_id == Permission.permission_id))\
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149 .filter(Repo2Perm.user_id == user.user_id).all()
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150 #overwrite userpermissions with defaults
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151 for perm in user_perms:
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152 #set write if owner
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153 if perm.Repository.user_id == user.user_id:
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154 p = 'repository.write'
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155 else:
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156 p = perm.Permission.permission_name
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157 user.permissions['repositories'][perm.Repo2Perm.repository.repo_name] = p
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158 meta.Session.remove()
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159 return user
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160
312
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161 def get_user(session):
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162 """
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163 Gets user from session, and wraps permissions into user
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164 @param session:
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165 """
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166 user = session.get('hg_app_user', AuthUser())
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167
312
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168 if user.is_authenticated:
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169 user = fill_perms(user)
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170 session['hg_app_user'] = user
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171 session.save()
312
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172 return user
239
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173
190
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174 #===============================================================================
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175 # CHECK DECORATORS
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176 #===============================================================================
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177 class LoginRequired(object):
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178 """
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179 Must be logged in to execute this function else redirect to login page
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180 """
329
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181
190
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182 def __call__(self, func):
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183 @wraps(func)
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184 def _wrapper(*fargs, **fkwargs):
199
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185 user = session.get('hg_app_user', AuthUser())
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186 log.debug('Checking login required for user:%s', user.username)
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187 if user.is_authenticated:
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188 log.debug('user %s is authenticated', user.username)
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189 func(*fargs)
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190 else:
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191 log.warn('user %s not authenticated', user.username)
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192 log.debug('redirecting to login page')
190
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193 return redirect(url('login_home'))
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194
190
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195 return _wrapper
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196
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197 class PermsDecorator(object):
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198 """
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199 Base class for decorators
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200 """
239
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201
329
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202 def __init__(self, *required_perms):
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203 available_perms = config['available_permissions']
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204 for perm in required_perms:
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205 if perm not in available_perms:
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206 raise Exception("'%s' permission is not defined" % perm)
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207 self.required_perms = set(required_perms)
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208 self.user_perms = None
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209
329
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210 def __call__(self, func):
239
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211 @wraps(func)
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212 def _wrapper(*fargs, **fkwargs):
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213 self.user_perms = session.get('hg_app_user', AuthUser()).permissions
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214 log.debug('checking %s permissions %s for %s',
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215 self.__class__.__name__, self.required_perms, func.__name__)
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216
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217 if self.check_permissions():
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218 log.debug('Permission granted for %s', func.__name__)
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219 return func(*fargs)
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220
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221 else:
329
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222 log.warning('Permission denied for %s', func.__name__)
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223 #redirect with forbidden ret code
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224 return abort(403)
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225 return _wrapper
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226
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227
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228 def check_permissions(self):
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229 """
329
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230 Dummy function for overriding
239
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231 """
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232 raise Exception('You have to write this function in child class')
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233
329
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234 class HasPermissionAllDecorator(PermsDecorator):
239
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235 """
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236 Checks for access permission for all given predicates. All of them have to
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237 be meet in order to fulfill the request
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238 """
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239
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240 def check_permissions(self):
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241 if self.required_perms.issubset(self.user_perms.get('global')):
239
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242 return True
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243 return False
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244
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245
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246 class HasPermissionAnyDecorator(PermsDecorator):
239
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247 """
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248 Checks for access permission for any of given predicates. In order to
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249 fulfill the request any of predicates must be meet
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250 """
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251
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252 def check_permissions(self):
361
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253 if self.required_perms.intersection(self.user_perms.get('global')):
329
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254 return True
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255 return False
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256
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257 class HasRepoPermissionAllDecorator(PermsDecorator):
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258 """
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259 Checks for access permission for all given predicates for specific
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260 repository. All of them have to be meet in order to fulfill the request
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261 """
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262
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263 def check_permissions(self):
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264 repo_name = get_repo_slug(request)
361
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265 try:
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266 user_perms = set([self.user_perms['repositories'][repo_name]])
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267 except KeyError:
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268 return False
329
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269 if self.required_perms.issubset(user_perms):
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270 return True
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271 return False
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272
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273
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274 class HasRepoPermissionAnyDecorator(PermsDecorator):
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275 """
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276 Checks for access permission for any of given predicates for specific
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277 repository. In order to fulfill the request any of predicates must be meet
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278 """
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279
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280 def check_permissions(self):
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281 repo_name = get_repo_slug(request)
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282
361
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283 try:
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284 user_perms = set([self.user_perms['repositories'][repo_name]])
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285 except KeyError:
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286 return False
329
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287 if self.required_perms.intersection(user_perms):
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288 return True
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289 return False
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290 #===============================================================================
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291 # CHECK FUNCTIONS
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292 #===============================================================================
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293
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294 class PermsFunction(object):
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295 """
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296 Base function for other check functions
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297 """
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298
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299 def __init__(self, *perms):
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300 available_perms = config['available_permissions']
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301
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302 for perm in perms:
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303 if perm not in available_perms:
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304 raise Exception("'%s' permission in not defined" % perm)
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305 self.required_perms = set(perms)
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306 self.user_perms = None
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307 self.granted_for = ''
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308 self.repo_name = None
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309
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310 def __call__(self, check_Location=''):
354
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311 user = session.get('hg_app_user', False)
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312 if not user:
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313 return False
329
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314 self.user_perms = user.permissions
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315 self.granted_for = user.username
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316 log.debug('checking %s %s', self.__class__.__name__, self.required_perms)
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317
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318 if self.check_permissions():
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319 log.debug('Permission granted for %s @%s', self.granted_for,
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320 check_Location)
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321 return True
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322
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323 else:
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324 log.warning('Permission denied for %s @%s', self.granted_for,
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325 check_Location)
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326 return False
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327
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328 def check_permissions(self):
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329 """
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330 Dummy function for overriding
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331 """
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332 raise Exception('You have to write this function in child class')
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333
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334 class HasPermissionAll(PermsFunction):
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335 def check_permissions(self):
361
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336 if self.required_perms.issubset(self.user_perms.get('global')):
329
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337 return True
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338 return False
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339
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340 class HasPermissionAny(PermsFunction):
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341 def check_permissions(self):
361
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342 if self.required_perms.intersection(self.user_perms.get('global')):
329
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343 return True
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344 return False
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345
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346 class HasRepoPermissionAll(PermsFunction):
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347
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348 def __call__(self, repo_name=None, check_Location=''):
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349 self.repo_name = repo_name
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350 return super(HasRepoPermissionAll, self).__call__(check_Location)
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351
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352 def check_permissions(self):
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353 if not self.repo_name:
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354 self.repo_name = get_repo_slug(request)
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355
361
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356 try:
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357 self.user_perms = set([self.user_perms['repositories']\
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358 [self.repo_name]])
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359 except KeyError:
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360 return False
329
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361 self.granted_for = self.repo_name
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362 if self.required_perms.issubset(self.user_perms):
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363 return True
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364 return False
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365
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366 class HasRepoPermissionAny(PermsFunction):
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367
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368
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369 def __call__(self, repo_name=None, check_Location=''):
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370 self.repo_name = repo_name
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371 return super(HasRepoPermissionAny, self).__call__(check_Location)
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372
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373 def check_permissions(self):
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374 if not self.repo_name:
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375 self.repo_name = get_repo_slug(request)
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376
361
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377 try:
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378 self.user_perms = set([self.user_perms['repositories']\
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379 [self.repo_name]])
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380 except KeyError:
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381 return False
329
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382 self.granted_for = self.repo_name
239
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383 if self.required_perms.intersection(self.user_perms):
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384 return True
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385 return False
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386
329
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387 #===============================================================================
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388 # SPECIAL VERSION TO HANDLE MIDDLEWARE AUTH
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389 #===============================================================================
239
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390
329
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391 class HasPermissionAnyMiddleware(object):
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392 def __init__(self, *perms):
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393 self.required_perms = set(perms)
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394
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395 def __call__(self, user, repo_name):
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396 usr = AuthUser()
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397 usr.user_id = user.user_id
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398 usr.username = user.username
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399 usr.is_admin = user.admin
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400
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401 try:
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402 self.user_perms = set([fill_perms(usr)\
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403 .permissions['repositories'][repo_name]])
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404 except:
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405 self.user_perms = set()
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406 self.granted_for = ''
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407 self.username = user.username
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408 self.repo_name = repo_name
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409 return self.check_permissions()
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410
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411 def check_permissions(self):
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412 log.debug('checking mercurial protocol '
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413 'permissions for user:%s repository:%s',
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414 self.username, self.repo_name)
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415 if self.required_perms.intersection(self.user_perms):
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416 log.debug('permission granted')
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417 return True
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418 log.debug('permission denied')
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419 return False