blob: 1b12f04b564a13ba0050cef918180f9e510d1795 [file] [log] [blame]
#!/usr/bin/env python2.5
#
# Copyright 2008 the Melange authors.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
"""Common validation helper functions.
"""
import feedparser
from google.appengine.api import urlfetch
from google.appengine.api import urlfetch_errors
from soc.models import linkable
def isFeedURLValid(feed_url=None):
"""Returns True if provided url is valid ATOM or RSS.
Args:
feed_url: ATOM or RSS feed url
"""
# a missing or empty feed url is never valid
if not feed_url:
return False
try:
result = urlfetch.fetch(feed_url)
except urlfetch_errors.Error:
return False
# 200 is the status code for 'all ok'
if result.status_code != 200:
return False
try:
parsed_feed = feedparser.parse(result.content)
except:
return False
# version is always present if the feed is valid
if not parsed_feed.version:
return False
return True
def isLinkIdFormatValid(link_id):
"""Returns True if link_id is in a valid format.
Args:
link_id: link ID used in URLs for identification
"""
if linkable.LINK_ID_REGEX.match(link_id):
return True
return False
def isScopePathFormatValid(scope_path):
"""Returns True if scope_path is in a valid format.
Args:
scope_path: scope path prepended to link ID
used for identification.
"""
if linkable.SCOPE_PATH_REGEX.match(scope_path):
return True
return False
def isAgeSufficientForProgram(birth_date, program):
"""Returns True if the specified birth_date is between student_min_age
and student_max_age for the specified program.
"""
# do not check if the data is not present
validation_result = True
if program.student_min_age_as_of:
if program.student_min_age:
min_year = program.student_min_age_as_of.year - program.student_min_age
min_date = program.student_min_age_as_of.replace(year=min_year)
validation_result = birth_date <= min_date
if validation_result and program.student_max_age:
max_year = program.student_min_age_as_of.year - program.student_max_age
max_date = program.student_min_age_as_of.replace(year=max_year)
validation_result = birth_date > max_date
return validation_result