author | Sverre Rabbelier <srabbelier@gmail.com> |
Thu, 02 Apr 2009 23:05:31 +0000 | |
changeset 2056 | bbd16a156bde |
parent 109 | 620f9b141567 |
permissions | -rwxr-xr-x |
109
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Load ../../google_appengine into trunk/thirdparty/google_appengine.
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parents:
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1 |
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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|
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class Commenter(object): |
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|
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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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15 |
os.makedirs(storage_dir) |
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|
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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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35 |
return resp(environ, start_response) |
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|
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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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40 |
if not os.path.exists(filename): |
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41 |
return [] |
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42 |
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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47 |
|
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48 |
def save_data(self, url, data): |
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49 |
filename = self.url_filename(url) |
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f = open(filename, 'wb') |
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dump(data, f) |
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52 |
f.close() |
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53 |
|
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def url_filename(self, url): |
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55 |
return os.path.join(self.storage_dir, urllib.quote(url, '')) |
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56 |
|
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57 |
_end_body_re = re.compile(r'</body.*?>', re.I|re.S) |
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58 |
|
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59 |
def add_to_end(self, html, extra_html): |
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60 |
""" |
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61 |
Adds extra_html to the end of the html page (before </body>) |
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62 |
""" |
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63 |
match = self._end_body_re.search(html) |
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64 |
if not match: |
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65 |
return html + extra_html |
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66 |
else: |
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return html[:match.start()] + extra_html + html[match.start():] |
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68 |
|
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69 |
def format_comments(self, comments): |
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if not comments: |
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71 |
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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75 |
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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78 |
time.strftime('%c', comment['time']))) |
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79 |
# Susceptible to XSS attacks!: |
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80 |
text.append(comment['comments']) |
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81 |
return ''.join(text) |
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82 |
|
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83 |
def submit_form(self, base_path, req): |
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84 |
return '''<h2>Leave a comment:</h2> |
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85 |
<form action="%s/.comments" method="POST"> |
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86 |
<input type="hidden" name="url" value="%s"> |
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87 |
<table width="100%%"> |
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88 |
<tr><td>Name:</td> |
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89 |
<td><input type="text" name="name" style="width: 100%%"></td></tr> |
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90 |
<tr><td>URL:</td> |
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91 |
<td><input type="text" name="homepage" style="width: 100%%"></td></tr> |
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92 |
</table> |
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93 |
Comments:<br> |
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94 |
<textarea name="comments" rows=10 style="width: 100%%"></textarea><br> |
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95 |
<input type="submit" value="Submit comment"> |
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96 |
</form> |
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97 |
''' % (base_path, html_escape(req.url)) |
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98 |
|
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99 |
def process_comment(self, req): |
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100 |
try: |
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101 |
url = req.params['url'] |
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102 |
name = req.params['name'] |
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103 |
homepage = req.params['homepage'] |
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104 |
comments = req.params['comments'] |
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105 |
except KeyError, e: |
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106 |
resp = exc.HTTPBadRequest('Missing parameter: %s' % e) |
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107 |
return resp |
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108 |
data = self.get_data(url) |
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109 |
data.append(dict( |
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110 |
name=name, |
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111 |
homepage=homepage, |
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112 |
comments=comments, |
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113 |
time=time.gmtime())) |
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114 |
self.save_data(url, data) |
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115 |
resp = exc.HTTPSeeOther(location=url+'#comment-area') |
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116 |
return resp |
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117 |
|
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118 |
if __name__ == '__main__': |
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119 |
import optparse |
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120 |
parser = optparse.OptionParser( |
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121 |
usage='%prog --port=PORT BASE_DIRECTORY' |
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122 |
) |
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123 |
parser.add_option( |
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124 |
'-p', '--port', |
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125 |
default='8080', |
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126 |
dest='port', |
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127 |
type='int', |
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128 |
help='Port to serve on (default 8080)') |
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129 |
parser.add_option( |
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130 |
'--comment-data', |
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131 |
default='./comments', |
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132 |
dest='comment_data', |
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133 |
help='Place to put comment data into (default ./comments/)') |
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134 |
options, args = parser.parse_args() |
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135 |
if not args: |
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136 |
parser.error('You must give a BASE_DIRECTORY') |
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137 |
base_dir = args[0] |
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|
138 |
from paste.urlparser import StaticURLParser |
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139 |
app = StaticURLParser(base_dir) |
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140 |
app = Commenter(app, options.comment_data) |
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|
141 |
from wsgiref.simple_server import make_server |
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142 |
httpd = make_server('localhost', options.port, app) |
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143 |
print 'Serving on http://localhost:%s' % options.port |
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|
144 |
try: |
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parents:
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|
145 |
httpd.serve_forever() |
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parents:
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|
146 |
except KeyboardInterrupt: |
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147 |
print '^C' |
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|
148 |
|
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|
149 |
|
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|
150 |