98 lines
3.5 KiB
Python
98 lines
3.5 KiB
Python
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#!/usr/bin/env python
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#
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# Copyright 2014 Google Inc. All Rights Reserved.
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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#
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"""This application produces formatted listings for Google Cloud
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Storage buckets.
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It takes a bucket name in the URL path and does an HTTP GET on the
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corresponding Google Cloud Storage URL to obtain a listing of the bucket
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contents. For example, if this app is invoked with the URI
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http://bucket-list.appspot.com/foo, it would remove the bucket name 'foo',
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append it to the Google Cloud Storage service URI and send a GET request to
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the resulting URI. The bucket listing is returned in an XML document, which is
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prepended with a reference to an XSLT style sheet for human readable
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presentation.
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More information about using Google App Engine apps and service accounts to
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call Google APIs can be found here:
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<https://developers.google.com/accounts/docs/OAuth2ServiceAccount>
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<http://code.google.com/appengine/docs/python/appidentity/overview.html>
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"""
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__author__ = 'marccohen@google.com (Marc Cohen)'
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import httplib2
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import logging
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import os
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import pickle
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import re
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from google.appengine.api import memcache
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from google.appengine.ext import webapp
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from google.appengine.ext.webapp import template
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from google.appengine.ext.webapp.util import run_wsgi_app
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from oauth2client.contrib.appengine import AppAssertionCredentials
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# Constants for the XSL stylesheet and the Google Cloud Storage URI.
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XSL = '\n<?xml-stylesheet href="/listing.xsl" type="text/xsl"?>\n';
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URI = 'http://commondatastorage.googleapis.com'
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# Obtain service account credentials and authorize HTTP connection.
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credentials = AppAssertionCredentials(
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scope='https://www.googleapis.com/auth/devstorage.read_write')
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http = credentials.authorize(httplib2.Http(memcache))
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class MainHandler(webapp.RequestHandler):
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def get(self):
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try:
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# Derive desired bucket name from path after domain name.
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bucket = self.request.path
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if bucket[-1] == '/':
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# Trim final slash, if necessary.
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bucket = bucket[:-1]
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# Send HTTP request to Google Cloud Storage to obtain bucket listing.
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resp, content = http.request(URI + bucket, "GET")
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if resp.status != 200:
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# If error getting bucket listing, raise exception.
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err = 'Error: ' + str(resp.status) + ', bucket: ' + bucket + \
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', response: ' + str(content)
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raise Exception(err)
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# Edit returned bucket listing XML to insert a reference to our style
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# sheet for nice formatting and send results to client.
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content = re.sub('(<ListBucketResult)', XSL + '\\1', content)
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self.response.headers['Content-Type'] = 'text/xml'
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self.response.out.write(content)
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except Exception as e:
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self.response.headers['Content-Type'] = 'text/plain'
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self.response.set_status(404)
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self.response.out.write(str(e))
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def main():
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application = webapp.WSGIApplication(
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[
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('.*', MainHandler),
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],
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debug=True)
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run_wsgi_app(application)
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if __name__ == '__main__':
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main()
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