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filter_utils.py
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Fri, Sep 6, 02:20

filter_utils.py
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# -*- coding: utf-8 -*-
##
## This file is part of Invenio.
## Copyright (C) 2013, 2014 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
"""WTForm filters implementation.
Filters can be applied to incoming form data, after process_formdata() has run.
See more information on:
http://wtforms.simplecodes.com/docs/1.0.4/fields.html#wtforms.fields.Field
"""
import six
from invenio.utils.html import HTMLWasher, \
CFG_HTML_BUFFER_ALLOWED_TAG_WHITELIST
def strip_string(value):
"""Remove leading and trailing spaces from string."""
if isinstance(value, six.string_types):
return value.strip()
else:
return value
def splitlines_list(value):
"""Split string per line into a list."""
if isinstance(value, six.string_types):
newdata = []
for line in value.splitlines():
if line.strip():
newdata.append(line.strip().encode('utf8'))
return newdata
else:
return value
def splitchar_list(c):
"""Return filter function that split string per char into a list.
:param c: Character to split on.
"""
def _inner(value):
"""Split string per char into a list."""
if isinstance(value, six.string_types):
newdata = []
for item in value.split(c):
if item.strip():
newdata.append(item.strip().encode('utf8'))
return newdata
else:
return value
return _inner
def map_func(func):
"""Return filter function that map a function to each item of a list.
:param func: Function to map.
"""
# FIXME
def _mapper(data):
"""Map a function to each item of a list."""
if isinstance(data, list):
return map(func, data)
else:
return data
return _mapper
def strip_prefixes(*prefixes):
"""Return a filter function that removes leading prefixes from a string."""
def _inner(value):
"""Remove a leading prefix from string."""
if isinstance(value, six.string_types):
for prefix in prefixes:
if value.lower().startswith(prefix):
return value[len(prefix):]
return value
return _inner
def sanitize_html(allowed_tag_whitelist=CFG_HTML_BUFFER_ALLOWED_TAG_WHITELIST):
"""Sanitize HTML."""
def _inner(value):
if isinstance(value, six.string_types):
washer = HTMLWasher()
return washer.wash(value,
allowed_tag_whitelist=allowed_tag_whitelist)
else:
return value
return _inner

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