| #!/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 |