mediagoblin/auth/tools.py

   1 # GNU MediaGoblin -- federated, autonomous media hosting
   2 # Copyright (C) 2011, 2012 MediaGoblin contributors.  See AUTHORS.
   3 #
   4 # This program is free software: you can redistribute it and/or modify
   5 # it under the terms of the GNU Affero General Public License as published by
   6 # the Free Software Foundation, either version 3 of the License, or
   7 # (at your option) any later version.
   8 #
   9 # This program is distributed in the hope that it will be useful,
  10 # but WITHOUT ANY WARRANTY; without even the implied warranty of
  11 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12 # GNU Affero General Public License for more details.
  13 #
  14 # You should have received a copy of the GNU Affero General Public License
  15 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
  16
  17
  18 import logging
  19
  20 import six
  21 import wtforms
  22 from sqlalchemy import or_
  23
  24 from mediagoblin import mg_globals
  25 from mediagoblin.tools.crypto import get_timed_signer_url
  26 from mediagoblin.db.models import LocalUser, Privilege
  27 from mediagoblin.tools.mail import (normalize_email, send_email,
  28                                     email_debug_message)
  29 from mediagoblin.tools.template import render_template
  30 from mediagoblin.tools.translate import lazy_pass_to_ugettext as _
  31 from mediagoblin.tools.pluginapi import hook_handle
  32 from mediagoblin import auth
  33
  34 _log = logging.getLogger(__name__)
  35
  36
  37 def normalize_user_or_email_field(allow_email=True, allow_user=True):
  38     """
  39     Check if we were passed a field that matches a username and/or email
  40     pattern.
  41
  42     This is useful for fields that can take either a username or email
  43     address. Use the parameters if you want to only allow a username for
  44     instance"""
  45     message = _(u'Invalid User name or email address.')
  46     nomail_msg = _(u"This field does not take email addresses.")
  47     nouser_msg = _(u"This field requires an email address.")
  48
  49     def _normalize_field(form, field):
  50         email = u'@' in field.data
  51         if email:  # normalize email address casing
  52             if not allow_email:
  53                 raise wtforms.ValidationError(nomail_msg)
  54             wtforms.validators.Email()(form, field)
  55             field.data = normalize_email(field.data)
  56         else:  # lower case user names
  57             if not allow_user:
  58                 raise wtforms.ValidationError(nouser_msg)
  59             wtforms.validators.Length(min=3, max=30)(form, field)
  60             wtforms.validators.Regexp(r'^[-_\w]+$')(form, field)
  61             field.data = field.data.lower()
  62         if field.data is None:  # should not happen, but be cautious anyway
  63             raise wtforms.ValidationError(message)
  64     return _normalize_field
  65
  66
  67 EMAIL_VERIFICATION_TEMPLATE = (
  68     u"{uri}?"
  69     u"token={verification_key}")
  70
  71
  72 def send_verification_email(user, request, email=None,
  73                             rendered_email=None):
  74     """
  75     Send the verification email to users to activate their accounts.
  76
  77     Args:
  78     - user: a user object
  79     - request: the request
  80     """
  81     if not email:
  82         email = user.email
  83
  84     if not rendered_email:
  85         verification_key = get_timed_signer_url('mail_verification_token') \
  86                 .dumps(user.id)
  87         rendered_email = render_template(
  88             request, 'mediagoblin/auth/verification_email.txt',
  89             {'username': user.username,
  90             'verification_url': EMAIL_VERIFICATION_TEMPLATE.format(
  91                     uri=request.urlgen('mediagoblin.auth.verify_email',
  92                                        qualified=True),
  93                     verification_key=verification_key)})
  94
  95     # TODO: There is no error handling in place
  96     send_email(
  97         mg_globals.app_config['email_sender_address'],
  98         [email],
  99         # TODO
 100         # Due to the distributed nature of GNU MediaGoblin, we should
 101         # find a way to send some additional information about the
 102         # specific GNU MediaGoblin instance in the subject line. For
 103         # example "GNU MediaGoblin @ Wandborg - [...]".
 104         'GNU MediaGoblin - Verify your email!',
 105         rendered_email)
 106
 107
 108 def basic_extra_validation(register_form, *args):
 109     users_with_username = LocalUser.query.filter_by(
 110         username=register_form.username.data).count()
 111     users_with_email = LocalUser.query.filter_by(
 112         email=register_form.email.data).count()
 113
 114     extra_validation_passes = True
 115
 116     if users_with_username:
 117         register_form.username.errors.append(
 118             _(u'Sorry, a user with that name already exists.'))
 119         extra_validation_passes = False
 120     if users_with_email:
 121         register_form.email.errors.append(
 122             _(u'Sorry, a user with that email address already exists.'))
 123         extra_validation_passes = False
 124
 125     return extra_validation_passes
 126
 127
 128 def register_user(request, register_form):
 129     """ Handle user registration """
 130     extra_validation_passes = auth.extra_validation(register_form)
 131
 132     if extra_validation_passes:
 133         # Create the user
 134         user = auth.create_user(register_form)
 135
 136         # give the user the default privileges
 137         user.all_privileges += get_default_privileges(user)
 138         user.save()
 139
 140         # log the user in
 141         request.session['user_id'] = six.text_type(user.id)
 142         request.session.save()
 143
 144         # send verification email
 145         email_debug_message(request)
 146         send_verification_email(user, request)
 147
 148         return user
 149
 150     return None
 151
 152 def get_default_privileges(user):
 153     instance_privilege_scheme = mg_globals.app_config['user_privilege_scheme']
 154     default_privileges = [Privilege.query.filter(
 155         Privilege.privilege_name==privilege_name).first()
 156         for privilege_name in instance_privilege_scheme.split(',')]
 157     default_privileges = [privilege for privilege in default_privileges if not privilege == None]
 158
 159     return default_privileges
 160
 161 def check_login_simple(username, password):
 162     user = auth.get_user(username=username)
 163     if not user:
 164         _log.info("User %r not found", username)
 165         hook_handle("auth_fake_login_attempt")
 166         return None
 167     if not auth.check_password(password, user.pw_hash):
 168         _log.warn("Wrong password for %r", username)
 169         return None
 170     _log.info("Logging %r in", username)
 171     return user
 172
 173
 174 def check_auth_enabled():
 175     if not hook_handle('authentication'):
 176         _log.warning('No authentication is enabled')
 177         return False
 178     else:
 179         return True
 180
 181
 182 def no_auth_logout(request):
 183     """
 184     Log out the user if no authentication is enabled, but don't delete
 185     the messages
 186     """
 187     if not request.app.auth and 'user_id' in request.session:
 188         del request.session['user_id']
 189         request.session.save()
 190
 191
 192 def create_basic_user(form):
 193     user = LocalUser()
 194     user.username = form.username.data
 195     user.email = form.email.data
 196     user.save()
 197     return user