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webdeposit_validation_utils.py
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Sat, Sep 28, 03:02

webdeposit_validation_utils.py
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# -*- coding: utf-8 -*-
##
## This file is part of Invenio.
## Copyright (C) 2013 CERN.
##
## Invenio 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 2 of the
## License, or (at your option) any later version.
##
## Invenio 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 Invenio; if not, write to the Free Software Foundation, Inc.,
## 59 Temple Place, Suite 330, Boston, MA 02111-1307, USA.
"""
Validation functions
"""
import re
from wtforms.validators import ValidationError, StopValidation, Regexp
from invenio.config import CFG_SITE_NAME
from invenio import pidutils
#
# General purpose validators
#
class ListLength(object):
"""
Require number of elements
:param min_num: Minimum number of elements.
:param max_num: Maximum number of elements.
:param element_filter: Callable used to filter the list prior to testing
the number of elements. Useful to remove empty elements.
"""
def __init__(self, min_num=None, max_num=None,
element_filter=lambda x: True):
self.min = min_num
self.max = max_num
self.element_filter = element_filter
def __call__(self, form, field):
test_list = []
if self.min or self.max:
test_list = filter(self.element_filter, field.data)
if self.min:
if self.min > len(test_list):
raise ValidationError(
"Minimum %s %s required." % (
self.min,
"entry is" if self.min == 1 else "entries are"
)
)
if self.max:
if self.max < len(test_list):
raise ValidationError(
"Maximum %s %s allowed." % (
self.max,
"entry is" if self.max == 1 else "entries are"
)
)
class RequiredIf(object):
"""
Require field if value of another field is set to a certain value.
"""
def __init__(self, other_field_name, values, message=None):
self.other_field_name = other_field_name
self.values = values
self.message = message
def __call__(self, form, field):
try:
other_field = getattr(form, self.other_field_name)
other_val = other_field.data
for v in self.values:
# Check if field value is required
if (callable(v) and v(other_val)) or (other_val == v):
# Field value is required - check the value
if not field.data or isinstance(field.data, basestring) \
and not field.data.strip():
if self.message is None:
self.message = 'This field is required.'
field.errors[:] = []
raise StopValidation(self.message % {
'other_field': other_field.label.text,
'value': other_val
})
except AttributeError:
pass
class NotRequiredIf(RequiredIf):
def __call__(self, form, field):
try:
other_field = getattr(form, self.other_field_name)
other_val = other_field.data
for v in self.values:
# Check if field value is not required.
if (callable(v) and v(other_val)) or (other_val == v):
raise StopValidation()
except AttributeError:
pass
def number_validate(form, field, submit=False,
error_message='It must be a number!'):
value = field.data or ''
if value == "" or value.isspace():
return
def is_number(s):
try:
float(s)
return True
except ValueError:
return False
if not is_number(value):
raise ValidationError(error_message)
#
# DOI-related validators
#
doi_syntax_validator = Regexp(
"(^$|(doi:)?10\.\d+(.\d+)*/.*)",
flags=re.I,
message="The provided DOI is invalid - it should look similar to "
"'10.1234/foo.bar'."
)
"""
DOI syntax validator
"""
class InvalidDOIPrefix(object):
"""
Validates if DOI
"""
def __init__(self, prefix='10.5072', message=None,
message_testing=None):
"""
@param doi_prefix: DOI prefix, e.g. 10.5072
"""
self.doi_prefix = prefix
# Remove trailing slash
if self.doi_prefix[-1] == '/':
self.doi_prefix = self.doi_prefix[:-1]
if not message_testing:
self.message_testing = "The prefix 10.5072 is invalid. The prefix" \
"is only used for testing purposes, and no DOIs with this " \
"prefix are attached to any meaningful content."
if not message:
self.message = 'The prefix %(prefix)s is ' \
'administered automatically by %(CFG_SITE_NAME)s.'
ctx = dict(
prefix=prefix,
CFG_SITE_NAME=CFG_SITE_NAME
)
self.message = self.message % ctx
self.message_testing = self.message_testing % ctx
def __call__(self, form, field):
value = field.data
# Defined prefix
if value:
if value.startswith("%s/" % self.doi_prefix):
raise ValidationError(self.message)
# Testing name space
if self.doi_prefix != "10.5072" and value.startswith("10.5072/"):
raise ValidationError(self.message_testing)
class PreReservedDOI(object):
"""
Validate that user did not edit pre-reserved DOI.
"""
def __init__(self, field_name, message=None, prefix='10.5072'):
self.field_name = field_name
self.message = message or 'You are not allowed to edit a ' \
'pre-reserved DOI. Click the Pre-reserve ' \
'DOI button to resolve the problem.'
self.prefix = prefix
def __call__(self, form, field):
attr_value = getattr(form, self.field_name).data
if isinstance(attr_value, dict):
attr_value = attr_value['doi']
if attr_value and field.data and field.data != attr_value \
and field.data.startswith("%s/" % self.prefix):
raise StopValidation(self.message)
# Stop further validation if DOI equals pre-reserved DOI.
if attr_value and field.data and field.data == attr_value:
raise StopValidation()
class PidValidator(object):
"""
Validate that value is a persistent identifier understood by us.
"""
def __init__(self, message=None):
self.message = message or "Not a valid persistent identifier"
def __call__(self, form, field):
schemes = pidutils.detect_identifier_schemes(field.data)
if not schemes:
raise ValidationError(self.message)
#
# Aliases
#
required_if = RequiredIf
not_required_if = NotRequiredIf
list_length = ListLength
invalid_doi_prefix_validator = InvalidDOIPrefix
pre_reserved_doi_validator = PreReservedDOI
pid_validator = PidValidator

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