Scripts to download files from google storage based on sha1 sums

third_party/gsutil/cloudauth/README.google

+This directory contains an example app ("cloudauth") that demonstrates
+how to use an OAUTH2 flow within a web app to authorize App Engine access
+to Google Storage.
+
+To install and try the app, take the following steps:
+
+1. The current code assumes you are already familiar with Google
+App Engine, and and have the App Engine SDK installed. If that's not
+true, start at http://code.google.com/appengine/
+
+In the remainder of these instructions, we assume
+you have gsutil unpacked in /usr/local/gsutil, Google
+App Engine installed at /usr/local/google_appengine, and
+http://pypi.python.org/pypi/google-api-python-client/1.0beta1 installed
+at /usr/local/google-api-python-client
+
+2. Copy the boto, cloudauth, and needed parts of the
+   google-api-python-client code into the google_appengine directory:
+     % cp -pr /usr/local/gsutil/cloudauth /usr/local/google_appengine
+     % cp -pr /usr/local/gsutil/boto/boto /usr/local/google_appengine/cloudauth
+     % cp -pr /usr/local/google-api-python-client-1.0beta1/{apiclient,httplib2,oauth2client,gflags*.py} \
+         /usr/local/google_appengine/cloudauth
+
+3. Go to the Google APIs Console and create a project (see
+   http://code.google.com/apis/console-help/). Then, click
+   the "API Access" tab and then the "Create an OAuth2 client
+   ID..." button. Enter a product name and click next, select "Web
+   application", and then enter the host "http://localhost:8080", and
+   click "Create client ID". Then click "Edit settings" and change the
+   Authorized Redirect URIs to be http://localhost:8080/auth_return.
+   (You'll need to update these values when you move from running
+   this app locally to running on App Engine.) Then copy the Client
+   ID and Client secret from this dialog into the corresponding values in
+   /usr/local/google_appengine/cloudauth/cloudauth.py. Note that these
+   values do not enable access until coupled with an OAUTH2 refresh token
+   that will be generated by the OAUTH2 flow implemented in this web app -
+   so it's safe to save the "secret key" value in your code.
+
+4. Try running it:
+     % cd /usr/local/google_appengine
+     % ./dev_appserver.py cloudauth
+   and then open your browser to http://localhost:8080
+
+   If it works, you should see the object loaded.
+
+5. At this point you can upload your app to Google
+   infrastructure, following the instructions at
+   http://code.google.com/appengine/docs/python/gettingstarted/uploading.html
+
+6. You can see documentation about the OAUTH2 client library at
+   http://code.google.com/p/google-api-python-client/wiki/OAuth2