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#!/usr/bin/env python
#
# Copyright 2008 Adam Stiles
# 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.
#
"""A url-shortener built on Google App Engine."""
__author__ = 'Adam Stiles'
"""
All Urly records in the database have an id and an href. We base62 that
integer id to create a short code that represents that Urly.
Format options are: json, xml, html, and txt
/{code} Redirect user to urly with this code
/{code}(.format) Show user formatted urly with this code
/new(.format)?href={href} Create a new urly with this href or
return existing one if it already exists
Note special handling for 'new' code
when we have a href GET parameter 'cause
'new' by itself looks like a code
"""
import wsgiref.handlers
import re, os, logging
from google.appengine.ext import webapp
from google.appengine.ext import db
from urly import Urly
from view import MainView
class MainHandler(webapp.RequestHandler):
"""All non-static requests go through this handler.
The code and format parameters are pre-populated by
our routing regex... see main() below.
"""
def get(self, code, format):
if (code is None):
MainView.render(self, 200, None, format)
return
href = self.request.get('href').strip().encode('utf-8')
title = self.request.get('title').strip().encode('utf-8')
if (code == 'new') and (href is not None):
try:
u = Urly.find_or_create_by_href(href)
if u is not None:
MainView.render(self, 200, u, format, href, title)
else:
logging.error("Error creating urly by href: %s", str(href))
MainView.render(self, 400, None, format, href)
except db.BadValueError:
# href parameter is bad
MainView.render(self, 400, None, format, href)
else:
u = Urly.find_by_code(str(code))
if u is not None:
MainView.render(self, 200, u, format)
else:
MainView.render(self, 404, None, format)
def head(self, code, format):
if (code is None):
self.error(400)
else:
u = Urly.find_by_code(str(code))
if u is not None:
self.redirect(u.href)
else:
self.error(404)
def main():
application = webapp.WSGIApplication([
('/([a-zA-Z0-9]{1,6})?(.xml|.json|.html|.txt)?', MainHandler)
], debug=True)
wsgiref.handlers.CGIHandler().run(application)
if __name__ == '__main__':
main()
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