thirdparty/google_appengine/lib/webob/docs/comment-example-code/example.py
author Todd Larsen <tlarsen@google.com>
Tue, 26 Aug 2008 21:49:54 +0000
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import os
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import urllib
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import time
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import re
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from cPickle import load, dump
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from webob import Request, Response, html_escape
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from webob import exc
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class Commenter(object):
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    def __init__(self, app, storage_dir):
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        self.app = app
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        self.storage_dir = storage_dir
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        if not os.path.exists(storage_dir):
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            os.makedirs(storage_dir)
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    def __call__(self, environ, start_response):
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        req = Request(environ)
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        if req.path_info_peek() == '.comments':
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            return self.process_comment(req)(environ, start_response)
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        # This is the base path of *this* middleware:
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        base_url = req.application_url
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        resp = req.get_response(self.app)
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        if resp.content_type != 'text/html' or resp.status_int != 200:
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            # Not an HTML response, we don't want to
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            # do anything to it
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            return resp(environ, start_response)
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        # Make sure the content isn't gzipped:
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        resp.decode_content()
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        comments = self.get_data(req.url)
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        body = resp.body
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        body = self.add_to_end(body, self.format_comments(comments))
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        body = self.add_to_end(body, self.submit_form(base_url, req))
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        resp.body = body
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        return resp(environ, start_response)
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    def get_data(self, url):
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        # Double-quoting makes the filename safe
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        filename = self.url_filename(url)
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        if not os.path.exists(filename):
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            return []
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        else:
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            f = open(filename, 'rb')
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            data = load(f)
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            f.close()
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            return data
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    def save_data(self, url, data):
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        filename = self.url_filename(url)
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        f = open(filename, 'wb')
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        dump(data, f)
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        f.close()
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    def url_filename(self, url):
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        return os.path.join(self.storage_dir, urllib.quote(url, ''))
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    _end_body_re = re.compile(r'</body.*?>', re.I|re.S)
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    def add_to_end(self, html, extra_html):
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        """
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        Adds extra_html to the end of the html page (before </body>)
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        """
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        match = self._end_body_re.search(html)
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        if not match:
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            return html + extra_html
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        else:
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            return html[:match.start()] + extra_html + html[match.start():]
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    def format_comments(self, comments):
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        if not comments:
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            return ''
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        text = []
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        text.append('<hr>')
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        text.append('<h2><a name="comment-area"></a>Comments (%s):</h2>' % len(comments))
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        for comment in comments:
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            text.append('<h3><a href="%s">%s</a> at %s:</h3>' % (
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                html_escape(comment['homepage']), html_escape(comment['name']),
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                time.strftime('%c', comment['time'])))
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            # Susceptible to XSS attacks!:
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            text.append(comment['comments'])
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        return ''.join(text)
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    def submit_form(self, base_path, req):
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        return '''<h2>Leave a comment:</h2>
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        <form action="%s/.comments" method="POST">
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         <input type="hidden" name="url" value="%s">
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         <table width="100%%">
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          <tr><td>Name:</td>
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              <td><input type="text" name="name" style="width: 100%%"></td></tr>
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          <tr><td>URL:</td>
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              <td><input type="text" name="homepage" style="width: 100%%"></td></tr>
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         </table>
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         Comments:<br>
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         <textarea name="comments" rows=10 style="width: 100%%"></textarea><br>
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         <input type="submit" value="Submit comment">
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        </form>
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        ''' % (base_path, html_escape(req.url))
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    def process_comment(self, req):
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        try:
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            url = req.params['url']
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            name = req.params['name']
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            homepage = req.params['homepage']
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            comments = req.params['comments']
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        except KeyError, e:
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            resp = exc.HTTPBadRequest('Missing parameter: %s' % e)
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            return resp
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        data = self.get_data(url)
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        data.append(dict(
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            name=name,
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            homepage=homepage,
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            comments=comments,
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            time=time.gmtime()))
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        self.save_data(url, data)
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        resp = exc.HTTPSeeOther(location=url+'#comment-area')
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        return resp
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if __name__ == '__main__':
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    import optparse
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    parser = optparse.OptionParser(
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        usage='%prog --port=PORT BASE_DIRECTORY'
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        )
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    parser.add_option(
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        '-p', '--port',
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        default='8080',
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        dest='port',
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        type='int',
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        help='Port to serve on (default 8080)')
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    parser.add_option(
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        '--comment-data',
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        default='./comments',
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        dest='comment_data',
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        help='Place to put comment data into (default ./comments/)')
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    options, args = parser.parse_args()
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    if not args:
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        parser.error('You must give a BASE_DIRECTORY')
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    base_dir = args[0]
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    from paste.urlparser import StaticURLParser
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    app = StaticURLParser(base_dir)
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    app = Commenter(app, options.comment_data)
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    from wsgiref.simple_server import make_server
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    httpd = make_server('localhost', options.port, app)
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    print 'Serving on http://localhost:%s' % options.port
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    try:
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        httpd.serve_forever()
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    except KeyboardInterrupt:
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        print '^C'
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