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annotate pylons_app/lib/auth.py @ 361:5d517bbf0a0d

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some extra checks for auth lib
author Marcin Kuzminski <marcin@python-works.com>
date Tue, 06 Jul 2010 23:57:57 +0200
parents f5f290d68646
children 6484963056cd
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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
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26 from functools import wraps
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27 from pylons import session, url, request
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28 from pylons.controllers.util import abort, redirect
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29 from pylons_app.model import meta
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30 from pylons_app.model.db import User, Repo2Perm, Repository, Permission
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31 from pylons_app.lib.utils import get_repo_slug
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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 from pylons import config
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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 def authfunc(environ, username, password):
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47 sa = meta.Session
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48 password_crypt = get_crypt_password(password)
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49 try:
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50 user = sa.query(User).filter(User.username == username).one()
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51 except (NoResultFound, MultipleResultsFound, OperationalError) as e:
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52 log.error(e)
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53 user = None
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54
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55 if user:
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56 if user.active:
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57 if user.username == username and user.password == password_crypt:
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58 log.info('user %s authenticated correctly', username)
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59 return True
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60 else:
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61 log.error('user %s is disabled', username)
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62
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63 return False
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64
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65 class AuthUser(object):
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66 """
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67 A simple object that handles a mercurial username for authentication
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68 """
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69 def __init__(self):
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70 self.username = 'None'
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71 self.user_id = None
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72 self.is_authenticated = False
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73 self.is_admin = False
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74 self.permissions = {}
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75
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76
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77 def set_available_permissions(config):
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78 """
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79 This function will propagate pylons globals with all available defined
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80 permission given in db. We don't wannt to check each time from db for new
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81 permissions since adding a new permission also requires application restart
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82 ie. to decorate new views with the newly created permission
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83 @param config:
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84 """
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85 log.info('getting information about all available permissions')
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86 sa = meta.Session
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87 all_perms = sa.query(Permission).all()
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88 config['available_permissions'] = [x.permission_name for x in all_perms]
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89
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90 def set_base_path(config):
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91 config['base_path'] = config['pylons.app_globals'].base_path
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92
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93 def fill_perms(user):
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94 sa = meta.Session
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95 user.permissions['repositories'] = {}
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96
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97 #first fetch default permissions
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98 default_perms = sa.query(Repo2Perm, Repository, Permission)\
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99 .join((Repository, Repo2Perm.repository == Repository.repo_name))\
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100 .join((Permission, Repo2Perm.permission_id == Permission.permission_id))\
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101 .filter(Repo2Perm.user_id == sa.query(User).filter(User.username ==
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102 'default').one().user_id).all()
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103
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104 if user.is_admin:
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105 user.permissions['global'] = set(['hg.admin'])
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106 #admin have all rights full
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107 for perm in default_perms:
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108 p = 'repository.admin'
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109 user.permissions['repositories'][perm.Repo2Perm.repository] = p
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110
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111 else:
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112 user.permissions['global'] = set()
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113 for perm in default_perms:
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114 if perm.Repository.private:
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115 #disable defaults for private repos,
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116 p = 'repository.none'
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117 elif perm.Repository.user_id == user.user_id:
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118 #set admin if owner
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119 p = 'repository.admin'
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120 else:
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121 p = perm.Permission.permission_name
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122
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123 user.permissions['repositories'][perm.Repo2Perm.repository] = p
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124
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125
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126 user_perms = sa.query(Repo2Perm, Permission, Repository)\
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127 .join((Repository, Repo2Perm.repository == Repository.repo_name))\
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128 .join((Permission, Repo2Perm.permission_id == Permission.permission_id))\
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129 .filter(Repo2Perm.user_id == user.user_id).all()
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130 #overwrite userpermissions with defaults
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131 for perm in user_perms:
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132 #set write if owner
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133 if perm.Repository.user_id == user.user_id:
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134 p = 'repository.write'
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135 else:
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136 p = perm.Permission.permission_name
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137 user.permissions['repositories'][perm.Repo2Perm.repository] = p
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138 return user
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139
312
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140 def get_user(session):
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141 """
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142 Gets user from session, and wraps permissions into user
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143 @param session:
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144 """
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145 user = session.get('hg_app_user', AuthUser())
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146
312
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147 if user.is_authenticated:
329
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148 user = fill_perms(user)
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149
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150 session['hg_app_user'] = user
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151 session.save()
312
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152 return user
239
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153
190
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154 #===============================================================================
329
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155 # CHECK DECORATORS
190
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156 #===============================================================================
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157 class LoginRequired(object):
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158 """
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159 Must be logged in to execute this function else redirect to login page
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160 """
329
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161
190
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162 def __call__(self, func):
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163 @wraps(func)
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164 def _wrapper(*fargs, **fkwargs):
199
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165 user = session.get('hg_app_user', AuthUser())
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166 log.debug('Checking login required for user:%s', user.username)
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167 if user.is_authenticated:
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168 log.debug('user %s is authenticated', user.username)
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169 func(*fargs)
190
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170 else:
329
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171 log.warn('user %s not authenticated', user.username)
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172 log.debug('redirecting to login page')
190
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173 return redirect(url('login_home'))
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174
190
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175 return _wrapper
239
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176
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177 class PermsDecorator(object):
329
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178 """
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179 Base class for decorators
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180 """
239
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181
329
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182 def __init__(self, *required_perms):
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183 available_perms = config['available_permissions']
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184 for perm in required_perms:
239
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185 if perm not in available_perms:
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186 raise Exception("'%s' permission is not defined" % perm)
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187 self.required_perms = set(required_perms)
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188 self.user_perms = None
239
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189
329
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190 def __call__(self, func):
239
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191 @wraps(func)
329
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192 def _wrapper(*fargs, **fkwargs):
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193 self.user_perms = session.get('hg_app_user', AuthUser()).permissions
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194 log.debug('checking %s permissions %s for %s',
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195 self.__class__.__name__, self.required_perms, func.__name__)
239
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196
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197 if self.check_permissions():
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198 log.debug('Permission granted for %s', func.__name__)
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199 return func(*fargs)
239
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200
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201 else:
329
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202 log.warning('Permission denied for %s', func.__name__)
239
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203 #redirect with forbidden ret code
329
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204 return abort(403)
239
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205 return _wrapper
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206
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207
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208 def check_permissions(self):
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209 """
329
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210 Dummy function for overriding
239
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211 """
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212 raise Exception('You have to write this function in child class')
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213
329
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214 class HasPermissionAllDecorator(PermsDecorator):
239
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215 """
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216 Checks for access permission for all given predicates. All of them have to
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217 be meet in order to fulfill the request
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218 """
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219
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220 def check_permissions(self):
361
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221 if self.required_perms.issubset(self.user_perms.get('global')):
239
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222 return True
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223 return False
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224
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225
329
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226 class HasPermissionAnyDecorator(PermsDecorator):
239
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227 """
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228 Checks for access permission for any of given predicates. In order to
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229 fulfill the request any of predicates must be meet
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230 """
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231
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232 def check_permissions(self):
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233 if self.required_perms.intersection(self.user_perms.get('global')):
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234 return True
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235 return False
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236
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237 class HasRepoPermissionAllDecorator(PermsDecorator):
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238 """
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239 Checks for access permission for all given predicates for specific
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240 repository. All of them have to be meet in order to fulfill the request
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241 """
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242
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243 def check_permissions(self):
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244 repo_name = get_repo_slug(request)
361
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245 try:
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246 user_perms = set([self.user_perms['repositories'][repo_name]])
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247 except KeyError:
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248 return False
329
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249 if self.required_perms.issubset(user_perms):
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250 return True
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251 return False
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252
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253
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254 class HasRepoPermissionAnyDecorator(PermsDecorator):
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255 """
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256 Checks for access permission for any of given predicates for specific
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257 repository. In order to fulfill the request any of predicates must be meet
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258 """
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259
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260 def check_permissions(self):
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261 repo_name = get_repo_slug(request)
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262
361
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263 try:
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264 user_perms = set([self.user_perms['repositories'][repo_name]])
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265 except KeyError:
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266 return False
329
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267 if self.required_perms.intersection(user_perms):
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268 return True
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269 return False
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270 #===============================================================================
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271 # CHECK FUNCTIONS
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272 #===============================================================================
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273
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274 class PermsFunction(object):
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275 """
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276 Base function for other check functions
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277 """
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278
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279 def __init__(self, *perms):
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280 available_perms = config['available_permissions']
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281
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282 for perm in perms:
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283 if perm not in available_perms:
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284 raise Exception("'%s' permission in not defined" % perm)
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285 self.required_perms = set(perms)
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286 self.user_perms = None
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287 self.granted_for = ''
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288 self.repo_name = None
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289
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290 def __call__(self, check_Location=''):
354
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291 user = session.get('hg_app_user', False)
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292 if not user:
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293 return False
329
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294 self.user_perms = user.permissions
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295 self.granted_for = user.username
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296 log.debug('checking %s %s', self.__class__.__name__, self.required_perms)
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297
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298 if self.check_permissions():
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299 log.debug('Permission granted for %s @%s', self.granted_for,
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300 check_Location)
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301 return True
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302
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303 else:
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304 log.warning('Permission denied for %s @%s', self.granted_for,
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305 check_Location)
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306 return False
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307
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308 def check_permissions(self):
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309 """
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310 Dummy function for overriding
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311 """
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312 raise Exception('You have to write this function in child class')
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313
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314 class HasPermissionAll(PermsFunction):
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315 def check_permissions(self):
361
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316 if self.required_perms.issubset(self.user_perms.get('global')):
329
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317 return True
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318 return False
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319
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320 class HasPermissionAny(PermsFunction):
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321 def check_permissions(self):
361
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322 if self.required_perms.intersection(self.user_perms.get('global')):
329
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323 return True
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324 return False
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325
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326 class HasRepoPermissionAll(PermsFunction):
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327
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328 def __call__(self, repo_name=None, check_Location=''):
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329 self.repo_name = repo_name
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330 return super(HasRepoPermissionAll, self).__call__(check_Location)
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331
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332 def check_permissions(self):
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333 if not self.repo_name:
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334 self.repo_name = get_repo_slug(request)
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335
361
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336 try:
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337 self.user_perms = set([self.user_perms['repositories']\
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338 [self.repo_name]])
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339 except KeyError:
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340 return False
329
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341 self.granted_for = self.repo_name
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342 if self.required_perms.issubset(self.user_perms):
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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 HasRepoPermissionAny(PermsFunction):
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347
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348
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349 def __call__(self, repo_name=None, check_Location=''):
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350 self.repo_name = repo_name
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351 return super(HasRepoPermissionAny, self).__call__(check_Location)
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352
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353 def check_permissions(self):
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354 if not self.repo_name:
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355 self.repo_name = get_repo_slug(request)
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356
361
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357 try:
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358 self.user_perms = set([self.user_perms['repositories']\
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359 [self.repo_name]])
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360 except KeyError:
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361 return False
329
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362 self.granted_for = self.repo_name
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363 if self.required_perms.intersection(self.user_perms):
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364 return True
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365 return False
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366
329
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367 #===============================================================================
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368 # SPECIAL VERSION TO HANDLE MIDDLEWARE AUTH
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369 #===============================================================================
239
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370
329
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371 class HasPermissionAnyMiddleware(object):
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372 def __init__(self, *perms):
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373 self.required_perms = set(perms)
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374
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375 def __call__(self, user, repo_name):
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376 usr = AuthUser()
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377 usr.user_id = user.user_id
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378 usr.username = user.username
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379 usr.is_admin = user.admin
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380
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381 try:
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382 self.user_perms = set([fill_perms(usr)\
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383 .permissions['repositories'][repo_name]])
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384 except:
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385 self.user_perms = set()
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386 self.granted_for = ''
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387 self.username = user.username
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388 self.repo_name = repo_name
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389 return self.check_permissions()
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390
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391 def check_permissions(self):
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392 log.debug('checking mercurial protocol '
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393 'permissions for user:%s repository:%s',
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394 self.username, self.repo_name)
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395 if self.required_perms.intersection(self.user_perms):
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396 log.debug('permission granted')
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397 return True
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398 log.debug('permission denied')
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399 return False