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annotate pylons_app/lib/auth.py @ 252:3782a6d698af

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licensing updates, code cleanups
author Marcin Kuzminski <marcin@python-works.com>
date Fri, 04 Jun 2010 13:08:29 +0200
parents b18f89d6d17f
children 0e5455fda8fd
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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, app_globals as g
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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
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31 from sqlalchemy.exc import OperationalError
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32 from sqlalchemy.orm.exc import NoResultFound, MultipleResultsFound
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33 import crypt
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34 import logging
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35 log = logging.getLogger(__name__)
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36
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37 def get_crypt_password(password):
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38 """
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39 Cryptographic function used for password hashing
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40 @param password: password to hash
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41 """
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42 return crypt.crypt(password, '6a')
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43
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44 def authfunc(environ, username, password):
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45 sa = meta.Session
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46 password_crypt = get_crypt_password(password)
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47 try:
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48 user = sa.query(User).filter(User.username == username).one()
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49 except (NoResultFound, MultipleResultsFound, OperationalError) as e:
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50 log.error(e)
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51 user = None
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52
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53 if user:
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54 if user.active:
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55 if user.username == username and user.password == password_crypt:
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56 log.info('user %s authenticated correctly', username)
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57 return True
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58 else:
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59 log.error('user %s is disabled', username)
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60
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61 return False
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62
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63 class AuthUser(object):
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64 """
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65 A simple object that handles a mercurial username for authentication
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66 """
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67 username = 'None'
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68 is_authenticated = False
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69 is_admin = False
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70 permissions = set()
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71 group = set()
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72
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73 def __init__(self):
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74 pass
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78 def set_available_permissions(config):
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79 """
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80 This function will propagate pylons globals with all available defined
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81 permission given in db. We don't wannt to check each time from db for new
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82 permissions since adding a new permission also requires application restart
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83 ie. to decorate new views with the newly created permission
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84 @param config:
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85 """
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86 from pylons_app.model.meta import Session
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87 from pylons_app.model.db import Permission
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88 logging.info('getting information about all available permissions')
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89 sa = Session()
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90 all_perms = sa.query(Permission).all()
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91 config['pylons.app_globals'].available_permissions = [x.permission_name for x in all_perms]
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92
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93
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94
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95 #===============================================================================
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96 # DECORATORS
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97 #===============================================================================
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98 class LoginRequired(object):
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99 """
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100 Must be logged in to execute this function else redirect to login page
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101 """
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102 def __init__(self):
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103 pass
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104
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105 def __call__(self, func):
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106
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107 @wraps(func)
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108 def _wrapper(*fargs, **fkwargs):
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109 user = session.get('hg_app_user', AuthUser())
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110 log.info('Checking login required for user:%s', user.username)
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111 if user.is_authenticated:
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112 log.info('user %s is authenticated', user.username)
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113 func(*fargs)
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114 else:
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115 logging.info('user %s not authenticated', user.username)
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116 logging.info('redirecting to login page')
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117 return redirect(url('login_home'))
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118
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119 return _wrapper
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120
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121 class PermsDecorator(object):
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122
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123 def __init__(self, *perms):
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124 available_perms = g.available_permissions
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125 for perm in perms:
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126 if perm not in available_perms:
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127 raise Exception("'%s' permission in not defined" % perm)
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128 self.required_perms = set(perms)
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129 self.user_perms = set([])#propagate this list from somewhere.
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130
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131 def __call__(self, func):
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132 @wraps(func)
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133 def _wrapper(*args, **kwargs):
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134 logging.info('checking %s permissions %s for %s',
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135 self.__class__.__name__[-3:], self.required_perms, func.__name__)
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136
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137 if self.check_permissions():
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138 logging.info('Permission granted for %s', func.__name__)
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139 return func(*args, **kwargs)
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140
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141 else:
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142 logging.warning('Permission denied for %s', func.__name__)
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143 #redirect with forbidden ret code
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144 return redirect(url('access_denied'), 403)
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145 return _wrapper
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146
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147
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148 def check_permissions(self):
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149 """
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150 Dummy function for overiding
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151 """
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152 raise Exception('You have to write this function in child class')
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153
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154 class CheckPermissionAll(PermsDecorator):
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155 """
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156 Checks for access permission for all given predicates. All of them have to
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157 be meet in order to fulfill the request
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158 """
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159
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160 def check_permissions(self):
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161 if self.required_perms.issubset(self.user_perms):
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162 return True
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163 return False
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164
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165
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166 class CheckPermissionAny(PermsDecorator):
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167 """
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168 Checks for access permission for any of given predicates. In order to
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169 fulfill the request any of predicates must be meet
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170 """
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171
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172 def check_permissions(self):
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173 if self.required_perms.intersection(self.user_perms):
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174 return True
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175 return False
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176
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177
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178