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validators.py
924 lines | 33.6 KiB | text/x-python | PythonLexer
# -*- coding: utf-8 -*-
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
"""
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, aslist
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 HasRepoGroupPermissionAny, HasPermissionAny
# silence warnings and pylint
UnicodeString, OneOf, Int, Number, Regex, Email, Bool, StringBoolean, Set, \
NotEmpty, IPAddress, CIDR, String, FancyValidator
log = logging.getLogger(__name__)
class _Missing(object):
pass
Missing = _Missing()
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 UniqueList():
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):
def make_unique(value):
seen = []
return [c for c in value if not (c in seen or seen.append(c))]
if isinstance(value, list):
return make_unique(value)
elif isinstance(value, set):
return make_unique(list(value))
elif isinstance(value, tuple):
return make_unique(list(value))
elif value is None:
return []
else:
return [value]
def empty_value(self, value):
return []
return _UniqueList
def UniqueListFromString():
class _UniqueListFromString(UniqueList()):
def _to_python(self, value, state):
if isinstance(value, basestring):
value = aslist(value, ',')
return super(_UniqueListFromString, self)._to_python(value, state)
return _UniqueListFromString
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 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\-\_\.]*$', value) is None:
msg = M(self, 'invalid_username', state)
raise formencode.Invalid(msg, value, state)
return _validator
def ValidRegex(msg=None):
class _validator(formencode.validators.Regex):
messages = dict(invalid=msg or _('The input is not valid'))
return _validator
def ValidRepoUser():
class _validator(formencode.validators.FancyValidator):
messages = {
'invalid_username': _(u'Username %(username)s is not valid')
}
def validate_python(self, value, state):
try:
User.query().filter(User.active == True)\
.filter(User.username == value).one()
except Exception:
msg = M(self, 'invalid_username', state, username=value)
raise formencode.Invalid(msg, value, state,
error_dict=dict(username=msg)
)
return _validator
def ValidUserGroup(edit=False, old_data={}):
class _validator(formencode.validators.FancyValidator):
messages = {
'invalid_group': _(u'Invalid user group name'),
'group_exist': _(u'User group "%(usergroup)s" already exists'),
'invalid_usergroup_name':
_(u'user group name may only contain alphanumeric '
'characters underscores, periods or dashes and must begin '
'with alphanumeric character')
}
def validate_python(self, value, state):
if value in ['default']:
msg = M(self, 'invalid_group', state)
raise formencode.Invalid(msg, value, state,
error_dict=dict(users_group_name=msg)
)
#check if group is unique
old_ugname = None
if edit:
old_id = old_data.get('users_group_id')
old_ugname = UserGroup.get(old_id).users_group_name
if old_ugname != value or not edit:
is_existing_group = UserGroup.get_by_group_name(value,
case_insensitive=True)
if is_existing_group:
msg = M(self, 'group_exist', state, usergroup=value)
raise formencode.Invalid(msg, value, state,
error_dict=dict(users_group_name=msg)
)
if re.match(r'^[a-zA-Z0-9]{1}[a-zA-Z0-9\-\_\.]+$', 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 ValidRepoGroup(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 ValidOldPassword(username):
class _validator(formencode.validators.FancyValidator):
messages = {
'invalid_password': _(u'Invalid old password')
}
def validate_python(self, value, state):
from rhodecode.lib import auth_modules
if not auth_modules.authenticate(username, value, ''):
msg = M(self, 'invalid_password', state)
raise formencode.Invalid(msg, value, state,
error_dict=dict(current_password=msg)
)
return _validator
def ValidPasswordsMatch(passwd='new_password', passwd_confirmation='password_confirmation'):
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(passwd)
if pass_val != value[passwd_confirmation]:
msg = M(self, 'password_mismatch', state)
raise formencode.Invalid(msg, value, state,
error_dict={passwd:msg, passwd_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 import auth_modules
password = value['password']
username = value['username']
if not auth_modules.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):
if repo_type == 'hg':
from rhodecode.lib.vcs.backends.hg.repository import MercurialRepository
if url.startswith('http'):
# initially check if it's at least the proper URL
# or does it pass basic auth
MercurialRepository._check_url(url, ui)
elif url.startswith('svn+http'):
from hgsubversion.svnrepo import svnremoterepo
svnremoterepo(ui, url).svn.uuid
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
# create repositories with write permission on group is set to true
create_on_write = HasPermissionAny('hg.create.write_on_repogroup.true')()
group_admin = HasRepoGroupPermissionAny('group.admin')(gr_name,
'can write into group validator')
group_write = HasRepoGroupPermissionAny('group.write')(gr_name,
'can write into group validator')
forbidden = not (group_admin or (group_write and create_on_write))
can_create_repos = HasPermissionAny('hg.admin', 'hg.create.repository')
gid = (old_data['repo_group'].get('group_id')
if (old_data and 'repo_group' in old_data) else None)
value_changed = gid != safe_int(value)
new = not old_data
# do check if we changed the value, there's a case that someone got
# revoked write permissions to a repository, he still created, we
# don't need to check permission if he didn't change the value of
# groups in form box
if value_changed or new:
#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 = HasRepoGroupPermissionAny('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 == User.DEFAULT_USER:
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.UnicodeString):
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
def ValidAuthPlugins():
class _validator(formencode.validators.FancyValidator):
messages = dict(
import_duplicate=_('Plugins %(loaded)s and %(next_to_load)s both export the same name')
)
def _to_python(self, value, state):
# filter empty values
return filter(lambda s: s not in [None, ''], value)
def validate_python(self, value, state):
from rhodecode.lib import auth_modules
module_list = value
unique_names = {}
try:
for module in module_list:
plugin = auth_modules.loadplugin(module)
plugin_name = plugin.name
if plugin_name in unique_names:
msg = M(self, 'import_duplicate', state,
loaded=unique_names[plugin_name],
next_to_load=plugin_name)
raise formencode.Invalid(msg, value, state)
unique_names[plugin_name] = plugin
except (ImportError, AttributeError, TypeError), e:
raise formencode.Invalid(str(e), value, state)
return _validator