allow underscores in usernames. Helps creating special internal users

rhodecode/model/validators.py

@@ -1,827 +1,827 b''
 """
 Set of generic validators
 """
 import os
 import re
 import formencode
 import logging
 from collections import defaultdict
 from pylons.i18n.translation import _
 from webhelpers.pylonslib.secure_form import authentication_token
 
 from formencode.validators import (
     UnicodeString, OneOf, Int, Number, Regex, Email, Bool, StringBoolean, Set,
     NotEmpty, IPAddress, CIDR, String, FancyValidator
 )
 from rhodecode.lib.compat import OrderedSet
 from rhodecode.lib import ipaddr
 from rhodecode.lib.utils import repo_name_slug
 from rhodecode.lib.utils2 import safe_int, str2bool
 from rhodecode.model.db import RepoGroup, Repository, UserGroup, User,\
     ChangesetStatus
 from rhodecode.lib.exceptions import LdapImportError
 from rhodecode.config.routing import ADMIN_PREFIX
 from rhodecode.lib.auth import HasReposGroupPermissionAny, HasPermissionAny
 
 # silence warnings and pylint
 UnicodeString, OneOf, Int, Number, Regex, Email, Bool, StringBoolean, Set, \
     NotEmpty, IPAddress, CIDR, String, FancyValidator
 
 log = logging.getLogger(__name__)
 
 
 class UniqueList(formencode.FancyValidator):
     """
     Unique List !
     """
     messages = dict(
         empty=_('Value cannot be an empty list'),
         missing_value=_('Value cannot be an empty list'),
     )
 
     def _to_python(self, value, state):
         if isinstance(value, list):
             return value
         elif isinstance(value, set):
             return list(value)
         elif isinstance(value, tuple):
             return list(value)
         elif value is None:
             return []
         else:
             return [value]
 
     def empty_value(self, value):
         return []
 
 
 class StateObj(object):
     """
     this is needed to translate the messages using _() in validators
     """
     _ = staticmethod(_)
 
 
 def M(self, key, state=None, **kwargs):
     """
     returns string from self.message based on given key,
     passed kw params are used to substitute %(named)s params inside
     translated strings
 
     :param msg:
     :param state:
     """
     if state is None:
         state = StateObj()
     else:
         state._ = staticmethod(_)
     #inject validator into state object
     return self.message(key, state, **kwargs)
 
 
 def ValidUsername(edit=False, old_data={}):
     class _validator(formencode.validators.FancyValidator):
         messages = {
             'username_exists': _(u'Username "%(username)s" already exists'),
             'system_invalid_username':
                 _(u'Username "%(username)s" is forbidden'),
             'invalid_username':
                 _(u'Username may only contain alphanumeric characters '
                   'underscores, periods or dashes and must begin with '
-                  'alphanumeric character')
+                  'alphanumeric character or underscore')
         }
 
         def validate_python(self, value, state):
             if value in ['default', 'new_user']:
                 msg = M(self, 'system_invalid_username', state, username=value)
                 raise formencode.Invalid(msg, value, state)
             #check if user is unique
             old_un = None
             if edit:
                 old_un = User.get(old_data.get('user_id')).username
 
             if old_un != value or not edit:
                 if User.get_by_username(value, case_insensitive=True):
                     msg = M(self, 'username_exists', state, username=value)
                     raise formencode.Invalid(msg, value, state)
 
-            if re.match(r'^[a-zA-Z0-9]{1}[a-zA-Z0-9\-\_\.]*$', value) is None:
+            if re.match(r'^[a-zA-Z0-9\_]{1}[a-zA-Z0-9\-\_\.]*$', value) is None:
                 msg = M(self, 'invalid_username', state)
                 raise formencode.Invalid(msg, value, state)
     return _validator
 
 
 def ValidRepoUser():
     class _validator(formencode.validators.FancyValidator):
         messages = {
             'invalid_username': _(u'Username %(username)s is not valid')
         }
 
         def validate_python(self, value, state):
             try:
                 User.query().filter(User.active == True)\
                     .filter(User.username == value).one()
             except Exception:
                 msg = M(self, 'invalid_username', state, username=value)
                 raise formencode.Invalid(msg, value, state,
                     error_dict=dict(username=msg)
                 )
 
     return _validator
 
 
 def ValidUserGroup(edit=False, old_data={}):
     class _validator(formencode.validators.FancyValidator):
         messages = {
             'invalid_group': _(u'Invalid user group name'),
             'group_exist': _(u'User group "%(usergroup)s" already exists'),
             'invalid_usergroup_name':
                 _(u'user group name may only contain alphanumeric '
                   'characters underscores, periods or dashes and must begin '
                   'with alphanumeric character')
         }
 
         def validate_python(self, value, state):
             if value in ['default']:
                 msg = M(self, 'invalid_group', state)
                 raise formencode.Invalid(msg, value, state,
                     error_dict=dict(users_group_name=msg)
                 )
             #check if group is unique
             old_ugname = None
             if edit:
                 old_id = old_data.get('users_group_id')
                 old_ugname = UserGroup.get(old_id).users_group_name
 
             if old_ugname != value or not edit:
                 is_existing_group = UserGroup.get_by_group_name(value,
                                                         case_insensitive=True)
                 if is_existing_group:
                     msg = M(self, 'group_exist', state, usergroup=value)
                     raise formencode.Invalid(msg, value, state,
                         error_dict=dict(users_group_name=msg)
                     )
 
             if re.match(r'^[a-zA-Z0-9]{1}[a-zA-Z0-9\-\_\.]+$', value) is None:
                 msg = M(self, 'invalid_usergroup_name', state)
                 raise formencode.Invalid(msg, value, state,
                     error_dict=dict(users_group_name=msg)
                 )
 
     return _validator
 
 
 def ValidReposGroup(edit=False, old_data={}):
     class _validator(formencode.validators.FancyValidator):
         messages = {
             'group_parent_id': _(u'Cannot assign this group as parent'),
             'group_exists': _(u'Group "%(group_name)s" already exists'),
             'repo_exists':
                 _(u'Repository with name "%(group_name)s" already exists')
         }
 
         def validate_python(self, value, state):
             # TODO WRITE VALIDATIONS
             group_name = value.get('group_name')
             group_parent_id = value.get('group_parent_id')
 
             # slugify repo group just in case :)
             slug = repo_name_slug(group_name)
 
             # check for parent of self
             parent_of_self = lambda: (
                 old_data['group_id'] == int(group_parent_id)
                 if group_parent_id else False
             )
             if edit and parent_of_self():
                 msg = M(self, 'group_parent_id', state)
                 raise formencode.Invalid(msg, value, state,
                     error_dict=dict(group_parent_id=msg)
                 )
 
             old_gname = None
             if edit:
                 old_gname = RepoGroup.get(old_data.get('group_id')).group_name
 
             if old_gname != group_name or not edit:
 
                 # check group
                 gr = RepoGroup.query()\
                       .filter(RepoGroup.group_name == slug)\
                       .filter(RepoGroup.group_parent_id == group_parent_id)\
                       .scalar()
 
                 if gr:
                     msg = M(self, 'group_exists', state, group_name=slug)
                     raise formencode.Invalid(msg, value, state,
                             error_dict=dict(group_name=msg)
                     )
 
                 # check for same repo
                 repo = Repository.query()\
                       .filter(Repository.repo_name == slug)\
                       .scalar()
 
                 if repo:
                     msg = M(self, 'repo_exists', state, group_name=slug)
                     raise formencode.Invalid(msg, value, state,
                             error_dict=dict(group_name=msg)
                     )
 
     return _validator
 
 
 def ValidPassword():
     class _validator(formencode.validators.FancyValidator):
         messages = {
             'invalid_password':
                 _(u'Invalid characters (non-ascii) in password')
         }
 
         def validate_python(self, value, state):
             try:
                 (value or '').decode('ascii')
             except UnicodeError:
                 msg = M(self, 'invalid_password', state)
                 raise formencode.Invalid(msg, value, state,)
     return _validator
 
 
 def ValidPasswordsMatch():
     class _validator(formencode.validators.FancyValidator):
         messages = {
             'password_mismatch': _(u'Passwords do not match'),
         }
 
         def validate_python(self, value, state):
 
             pass_val = value.get('password') or value.get('new_password')
             if pass_val != value['password_confirmation']:
                 msg = M(self, 'password_mismatch', state)
                 raise formencode.Invalid(msg, value, state,
                      error_dict=dict(password_confirmation=msg)
                 )
     return _validator
 
 
 def ValidAuth():
     class _validator(formencode.validators.FancyValidator):
         messages = {
             'invalid_password': _(u'invalid password'),
             'invalid_username': _(u'invalid user name'),
             'disabled_account': _(u'Your account is disabled')
         }
 
         def validate_python(self, value, state):
             from rhodecode.lib.auth import authenticate
 
             password = value['password']
             username = value['username']
 
             if not authenticate(username, password):
                 user = User.get_by_username(username)
                 if user and not user.active:
                     log.warning('user %s is disabled' % username)
                     msg = M(self, 'disabled_account', state)
                     raise formencode.Invalid(msg, value, state,
                         error_dict=dict(username=msg)
                     )
                 else:
                     log.warning('user %s failed to authenticate' % username)
                     msg = M(self, 'invalid_username', state)
                     msg2 = M(self, 'invalid_password', state)
                     raise formencode.Invalid(msg, value, state,
                         error_dict=dict(username=msg, password=msg2)
                     )
     return _validator
 
 
 def ValidAuthToken():
     class _validator(formencode.validators.FancyValidator):
         messages = {
             'invalid_token': _(u'Token mismatch')
         }
 
         def validate_python(self, value, state):
             if value != authentication_token():
                 msg = M(self, 'invalid_token', state)
                 raise formencode.Invalid(msg, value, state)
     return _validator
 
 
 def ValidRepoName(edit=False, old_data={}):
     class _validator(formencode.validators.FancyValidator):
         messages = {
             'invalid_repo_name':
                 _(u'Repository name %(repo)s is disallowed'),
             'repository_exists':
                 _(u'Repository named %(repo)s already exists'),
             'repository_in_group_exists': _(u'Repository "%(repo)s" already '
                                             'exists in group "%(group)s"'),
             'same_group_exists': _(u'Repository group with name "%(repo)s" '
                                    'already exists')
         }
 
         def _to_python(self, value, state):
             repo_name = repo_name_slug(value.get('repo_name', ''))
             repo_group = value.get('repo_group')
             if repo_group:
                 gr = RepoGroup.get(repo_group)
                 group_path = gr.full_path
                 group_name = gr.group_name
                 # value needs to be aware of group name in order to check
                 # db key This is an actual just the name to store in the
                 # database
                 repo_name_full = group_path + RepoGroup.url_sep() + repo_name
             else:
                 group_name = group_path = ''
                 repo_name_full = repo_name
 
             value['repo_name'] = repo_name
             value['repo_name_full'] = repo_name_full
             value['group_path'] = group_path
             value['group_name'] = group_name
             return value
 
         def validate_python(self, value, state):
 
             repo_name = value.get('repo_name')
             repo_name_full = value.get('repo_name_full')
             group_path = value.get('group_path')
             group_name = value.get('group_name')
 
             if repo_name in [ADMIN_PREFIX, '']:
                 msg = M(self, 'invalid_repo_name', state, repo=repo_name)
                 raise formencode.Invalid(msg, value, state,
                     error_dict=dict(repo_name=msg)
                 )
 
             rename = old_data.get('repo_name') != repo_name_full
             create = not edit
             if rename or create:
 
                 if group_path != '':
                     if Repository.get_by_repo_name(repo_name_full):
                         msg = M(self, 'repository_in_group_exists', state,
                                 repo=repo_name, group=group_name)
                         raise formencode.Invalid(msg, value, state,
                             error_dict=dict(repo_name=msg)
                         )
                 elif RepoGroup.get_by_group_name(repo_name_full):
                         msg = M(self, 'same_group_exists', state,
                                 repo=repo_name)
                         raise formencode.Invalid(msg, value, state,
                             error_dict=dict(repo_name=msg)
                         )
 
                 elif Repository.get_by_repo_name(repo_name_full):
                         msg = M(self, 'repository_exists', state,
                                 repo=repo_name)
                         raise formencode.Invalid(msg, value, state,
                             error_dict=dict(repo_name=msg)
                         )
             return value
     return _validator
 
 
 def ValidForkName(*args, **kwargs):
     return ValidRepoName(*args, **kwargs)
 
 
 def SlugifyName():
     class _validator(formencode.validators.FancyValidator):
 
         def _to_python(self, value, state):
             return repo_name_slug(value)
 
         def validate_python(self, value, state):
             pass
 
     return _validator
 
 
 def ValidCloneUri():
     from rhodecode.lib.utils import make_ui
 
     def url_handler(repo_type, url, ui=None):
         if repo_type == 'hg':
             from rhodecode.lib.vcs.backends.hg.repository import MercurialRepository
             from mercurial.httppeer import httppeer
             if url.startswith('http'):
                 ## initially check if it's at least the proper URL
                 ## or does it pass basic auth
                 MercurialRepository._check_url(url)
                 httppeer(ui, url)._capabilities()
             elif url.startswith('svn+http'):
                 from hgsubversion.svnrepo import svnremoterepo
                 svnremoterepo(ui, url).capabilities
             elif url.startswith('git+http'):
                 raise NotImplementedError()
             else:
                 raise Exception('clone from URI %s not allowed' % (url))
 
         elif repo_type == 'git':
             from rhodecode.lib.vcs.backends.git.repository import GitRepository
             if url.startswith('http'):
                 ## initially check if it's at least the proper URL
                 ## or does it pass basic auth
                 GitRepository._check_url(url)
             elif url.startswith('svn+http'):
                 raise NotImplementedError()
             elif url.startswith('hg+http'):
                 raise NotImplementedError()
             else:
                 raise Exception('clone from URI %s not allowed' % (url))
 
     class _validator(formencode.validators.FancyValidator):
         messages = {
             'clone_uri': _(u'invalid clone url'),
             'invalid_clone_uri': _(u'Invalid clone url, provide a '
                                     'valid clone http(s)/svn+http(s) url')
         }
 
         def validate_python(self, value, state):
             repo_type = value.get('repo_type')
             url = value.get('clone_uri')
 
             if not url:
                 pass
             else:
                 try:
                     url_handler(repo_type, url, make_ui('db', clear_session=False))
                 except Exception:
                     log.exception('Url validation failed')
                     msg = M(self, 'clone_uri')
                     raise formencode.Invalid(msg, value, state,
                         error_dict=dict(clone_uri=msg)
                     )
     return _validator
 
 
 def ValidForkType(old_data={}):
     class _validator(formencode.validators.FancyValidator):
         messages = {
             'invalid_fork_type': _(u'Fork have to be the same type as parent')
         }
 
         def validate_python(self, value, state):
             if old_data['repo_type'] != value:
                 msg = M(self, 'invalid_fork_type', state)
                 raise formencode.Invalid(msg, value, state,
                     error_dict=dict(repo_type=msg)
                 )
     return _validator
 
 
 def CanWriteGroup(old_data=None):
     class _validator(formencode.validators.FancyValidator):
         messages = {
             'permission_denied': _(u"You don't have permissions "
                                    "to create repository in this group"),
             'permission_denied_root': _(u"no permission to create repository "
                                         "in root location")
         }
 
         def _to_python(self, value, state):
             #root location
             if value in [-1, "-1"]:
                 return None
             return value
 
         def validate_python(self, value, state):
             gr = RepoGroup.get(value)
             gr_name = gr.group_name if gr else None  # None means ROOT location
             val = HasReposGroupPermissionAny('group.write', 'group.admin')
             can_create_repos = HasPermissionAny('hg.admin', 'hg.create.repository')
             forbidden = not val(gr_name, 'can write into group validator')
             value_changed = True  # old_data['repo_group'].get('group_id') != safe_int(value)
             if value_changed:  # do check if we changed the value
                 #parent group need to be existing
                 if gr and forbidden:
                     msg = M(self, 'permission_denied', state)
                     raise formencode.Invalid(msg, value, state,
                         error_dict=dict(repo_type=msg)
                     )
                 ## check if we can write to root location !
                 elif gr is None and not can_create_repos():
                     msg = M(self, 'permission_denied_root', state)
                     raise formencode.Invalid(msg, value, state,
                         error_dict=dict(repo_type=msg)
                     )
 
     return _validator
 
 
 def CanCreateGroup(can_create_in_root=False):
     class _validator(formencode.validators.FancyValidator):
         messages = {
             'permission_denied': _(u"You don't have permissions "
                                    "to create a group in this location")
         }
 
         def to_python(self, value, state):
             #root location
             if value in [-1, "-1"]:
                 return None
             return value
 
         def validate_python(self, value, state):
             gr = RepoGroup.get(value)
             gr_name = gr.group_name if gr else None  # None means ROOT location
 
             if can_create_in_root and gr is None:
                 #we can create in root, we're fine no validations required
                 return
 
             forbidden_in_root = gr is None and not can_create_in_root
             val = HasReposGroupPermissionAny('group.admin')
             forbidden = not val(gr_name, 'can create group validator')
             if forbidden_in_root or forbidden:
                 msg = M(self, 'permission_denied', state)
                 raise formencode.Invalid(msg, value, state,
                     error_dict=dict(group_parent_id=msg)
                 )
 
     return _validator
 
 
 def ValidPerms(type_='repo'):
     if type_ == 'repo_group':
         EMPTY_PERM = 'group.none'
     elif type_ == 'repo':
         EMPTY_PERM = 'repository.none'
     elif type_ == 'user_group':
         EMPTY_PERM = 'usergroup.none'
 
     class _validator(formencode.validators.FancyValidator):
         messages = {
             'perm_new_member_name':
                 _(u'This username or user group name is not valid')
         }
 
         def to_python(self, value, state):
             perms_update = OrderedSet()
             perms_new = OrderedSet()
             # build a list of permission to update and new permission to create
 
             #CLEAN OUT ORG VALUE FROM NEW MEMBERS, and group them using
             new_perms_group = defaultdict(dict)
             for k, v in value.copy().iteritems():
                 if k.startswith('perm_new_member'):
                     del value[k]
                     _type, part = k.split('perm_new_member_')
                     args = part.split('_')
                     if len(args) == 1:
                         new_perms_group[args[0]]['perm'] = v
                     elif len(args) == 2:
                         _key, pos = args
                         new_perms_group[pos][_key] = v
 
             # fill new permissions in order of how they were added
             for k in sorted(map(int, new_perms_group.keys())):
                 perm_dict = new_perms_group[str(k)]
                 new_member = perm_dict.get('name')
                 new_perm = perm_dict.get('perm')
                 new_type = perm_dict.get('type')
                 if new_member and new_perm and new_type:
                     perms_new.add((new_member, new_perm, new_type))
 
             for k, v in value.iteritems():
                 if k.startswith('u_perm_') or k.startswith('g_perm_'):
                     member = k[7:]
                     t = {'u': 'user',
                          'g': 'users_group'
                     }[k[0]]
                     if member == 'default':
                         if str2bool(value.get('repo_private')):
                             # set none for default when updating to
                             # private repo protects agains form manipulation
                             v = EMPTY_PERM
                     perms_update.add((member, v, t))
 
             value['perms_updates'] = list(perms_update)
             value['perms_new'] = list(perms_new)
 
             # update permissions
             for k, v, t in perms_new:
                 try:
                     if t is 'user':
                         self.user_db = User.query()\
                             .filter(User.active == True)\
                             .filter(User.username == k).one()
                     if t is 'users_group':
                         self.user_db = UserGroup.query()\
                             .filter(UserGroup.users_group_active == True)\
                             .filter(UserGroup.users_group_name == k).one()
 
                 except Exception:
                     log.exception('Updated permission failed')
                     msg = M(self, 'perm_new_member_type', state)
                     raise formencode.Invalid(msg, value, state,
                         error_dict=dict(perm_new_member_name=msg)
                     )
             return value
     return _validator
 
 
 def ValidSettings():
     class _validator(formencode.validators.FancyValidator):
         def _to_python(self, value, state):
             # settings  form for users that are not admin
             # can't edit certain parameters, it's extra backup if they mangle
             # with forms
 
             forbidden_params = [
                 'user', 'repo_type', 'repo_enable_locking',
                 'repo_enable_downloads', 'repo_enable_statistics'
             ]
 
             for param in forbidden_params:
                 if param in value:
                     del value[param]
             return value
 
         def validate_python(self, value, state):
             pass
     return _validator
 
 
 def ValidPath():
     class _validator(formencode.validators.FancyValidator):
         messages = {
             'invalid_path': _(u'This is not a valid path')
         }
 
         def validate_python(self, value, state):
             if not os.path.isdir(value):
                 msg = M(self, 'invalid_path', state)
                 raise formencode.Invalid(msg, value, state,
                     error_dict=dict(paths_root_path=msg)
                 )
     return _validator
 
 
 def UniqSystemEmail(old_data={}):
     class _validator(formencode.validators.FancyValidator):
         messages = {
             'email_taken': _(u'This e-mail address is already taken')
         }
 
         def _to_python(self, value, state):
             return value.lower()
 
         def validate_python(self, value, state):
             if (old_data.get('email') or '').lower() != value:
                 user = User.get_by_email(value, case_insensitive=True)
                 if user:
                     msg = M(self, 'email_taken', state)
                     raise formencode.Invalid(msg, value, state,
                         error_dict=dict(email=msg)
                     )
     return _validator
 
 
 def ValidSystemEmail():
     class _validator(formencode.validators.FancyValidator):
         messages = {
             'non_existing_email': _(u'e-mail "%(email)s" does not exist.')
         }
 
         def _to_python(self, value, state):
             return value.lower()
 
         def validate_python(self, value, state):
             user = User.get_by_email(value, case_insensitive=True)
             if user is None:
                 msg = M(self, 'non_existing_email', state, email=value)
                 raise formencode.Invalid(msg, value, state,
                     error_dict=dict(email=msg)
                 )
 
     return _validator
 
 
 def LdapLibValidator():
     class _validator(formencode.validators.FancyValidator):
         messages = {
 
         }
 
         def validate_python(self, value, state):
             try:
                 import ldap
                 ldap  # pyflakes silence !
             except ImportError:
                 raise LdapImportError()
 
     return _validator
 
 
 def AttrLoginValidator():
     class _validator(formencode.validators.FancyValidator):
         messages = {
             'invalid_cn':
                   _(u'The LDAP Login attribute of the CN must be specified - '
                     'this is the name of the attribute that is equivalent '
                     'to "username"')
         }
         messages['empty'] = messages['invalid_cn']
 
     return _validator
 
 
 def NotReviewedRevisions(repo_id):
     class _validator(formencode.validators.FancyValidator):
         messages = {
             'rev_already_reviewed':
                   _(u'Revisions %(revs)s are already part of pull request '
                     'or have set status')
         }
 
         def validate_python(self, value, state):
             # check revisions if they are not reviewed, or a part of another
             # pull request
             statuses = ChangesetStatus.query()\
                 .filter(ChangesetStatus.revision.in_(value))\
                 .filter(ChangesetStatus.repo_id == repo_id)\
                 .all()
 
             errors = []
             for cs in statuses:
                 if cs.pull_request_id:
                     errors.append(['pull_req', cs.revision[:12]])
                 elif cs.status:
                     errors.append(['status', cs.revision[:12]])
 
             if errors:
                 revs = ','.join([x[1] for x in errors])
                 msg = M(self, 'rev_already_reviewed', state, revs=revs)
                 raise formencode.Invalid(msg, value, state,
                     error_dict=dict(revisions=revs)
                 )
 
     return _validator
 
 
 def ValidIp():
     class _validator(CIDR):
         messages = dict(
             badFormat=_('Please enter a valid IPv4 or IpV6 address'),
             illegalBits=_('The network size (bits) must be within the range'
                 ' of 0-32 (not %(bits)r)')
         )
 
         def to_python(self, value, state):
             v = super(_validator, self).to_python(value, state)
             v = v.strip()
             net = ipaddr.IPNetwork(address=v)
             if isinstance(net, ipaddr.IPv4Network):
                 #if IPv4 doesn't end with a mask, add /32
                 if '/' not in value:
                     v += '/32'
             if isinstance(net, ipaddr.IPv6Network):
                 #if IPv6 doesn't end with a mask, add /128
                 if '/' not in value:
                     v += '/128'
             return v
 
         def validate_python(self, value, state):
             try:
                 addr = value.strip()
                 #this raises an ValueError if address is not IpV4 or IpV6
                 ipaddr.IPNetwork(address=addr)
             except ValueError:
                 raise formencode.Invalid(self.message('badFormat', state),
                                          value, state)
 
     return _validator
 
 
 def FieldKey():
     class _validator(formencode.validators.FancyValidator):
         messages = dict(
             badFormat=_('Key name can only consist of letters, '
                         'underscore, dash or numbers')
         )
 
         def validate_python(self, value, state):
             if not re.match('[a-zA-Z0-9_-]+$', value):
                 raise formencode.Invalid(self.message('badFormat', state),
                                          value, state)
     return _validator
 
 
 def BasePath():
     class _validator(formencode.validators.FancyValidator):
         messages = dict(
             badPath=_('Filename cannot be inside a directory')
         )
 
         def _to_python(self, value, state):
             return value
 
         def validate_python(self, value, state):
             if value != os.path.basename(value):
                 raise formencode.Invalid(self.message('badPath', state),
                                          value, state)
     return _validator