feedservice/main.py

   1 from google.appengine.ext import webapp
   2 from google.appengine.ext.webapp.util import run_wsgi_app
   3
   4 import urllib
   5 import httputils
   6 import feeddownloader
   7 import simplejson as json
   8
   9 class MainPage(webapp.RequestHandler):
  10     def get(self):
  11         self.response.headers['Content-Type'] = 'text/plain'
  12         self.response.out.write('Hello, webapp World!')
  13
  14 class Parse(webapp.RequestHandler):
  15
  16     def post(self):
  17         return self.get()
  18
  19     def get(self):
  20         urls = map(urllib.unquote, self.request.get_all('url'))
  21
  22         inline_logo = self.request.get_range('inline_logo', 0, 1, default=0)
  23         scale_to = self.request.get_range('scale_logo', 0, 1, default=0)
  24         logo_format = self.request.get('logo_format')
  25         strip_html = self.request.get_range('strip_html', 0, 1, default=0)
  26         use_cache = self.request.get_range('use_cache', 0, 1, default=1)
  27         modified = self.request.headers.get('If-Modified-Since', None)
  28         accept = self.request.headers.get('Accept', 'application/json')
  29
  30         if urls:
  31             podcasts, last_modified = feeddownloader.parse_feeds(urls, inline_logo, scale_to, logo_format, strip_html, modified, use_cache)
  32             self.send_response(podcasts, last_modified, accept)
  33
  34         else:
  35             self.response.set_status(400)
  36             self.response.out.write('parameter url missing')
  37
  38
  39     def send_response(self, podcasts, last_modified, formats):
  40         self.response.headers.add_header('Vary', 'Accept, User-Agent, Accept-Encoding')
  41
  42         format = httputils.select_matching_option(['text/html', 'application/json'], formats)
  43
  44         if format in (None, 'application/json'): #serve json as default
  45             content_type = 'application/json'
  46             content = json.dumps(podcasts, sort_keys=True, indent=None, separators=(',', ':'))
  47             from email import utils
  48             import time
  49             self.response.headers.add_header('Last-Modified', utils.formatdate(time.mktime(last_modified.timetuple())))
  50
  51
  52         else:
  53             import cgi
  54             content_type = 'text/html'
  55             pretty_json = json.dumps(podcasts, sort_keys=True, indent=4)
  56             pretty_json = cgi.escape(pretty_json)
  57             content = """<html><head>
  58 <link href="static/screen.css" type="text/css" rel="stylesheet" />
  59 <link href="static/prettify.css" type="text/css" rel="stylesheet" />
  60 <script type="text/javascript" src="static/prettify.js"></script>
  61 </head><body onload="prettyPrint()"><h1>HTML Response</h1><p>This response is HTML formatted. To get just the JSON data for processing in your client, <a href="/#accept">send the HTTP Header <em>Accept: application/json</em></a>. <a href="/">Back to the Documentation</a></p><pre class="prettyprint">%s</pre></body></html>""" % pretty_json
  62
  63         self.response.headers['Content-Type'] = content_type
  64         self.response.out.write(content)
  65
  66
  67 application = webapp.WSGIApplication([
  68                                       ('/',      MainPage),
  69                                       ('/parse', Parse)
  70                                      ],
  71                                      debug=True)
  72
  73 def main():
  74     run_wsgi_app(application)
  75
  76 if __name__ == "__main__":
  77     main()