Move sample using appengine images to this repository, add tests.

appengine/images/README.md

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+## Images Guestbook Sample
+
+This is a sample app for Google App Engine that exercises the [images
+Python
+API](https://cloud.google.com/appengine/docs/python/images/usingimages).
+
+See our other [Google Cloud Platform github
+repos](https://github.com/GoogleCloudPlatform) for sample applications
+and scaffolding for other python frameworks and use cases.
+
+## Run Locally
+
+1. Install the [Google Cloud SDK](https://cloud.google.com/sdk/),
+   including the [gcloud tool](https://cloud.google.com/sdk/gcloud/),
+   and [gcloud app
+   component](https://cloud.google.com/sdk/gcloud-app).
+
+1. Setup the gcloud tool.
+   ```
+   gcloud components update app
+   gcloud auth login
+   gcloud config set project <your-app-id>
+   ```
+   You don't need a valid app-id to run locally, but will need a valid id
+   to deploy below.
+
+1. Clone this repo.
+   ```
+   git clone https://github.com/GoogleCloudPlatform/python-docs-samples.git
+   cd appengine/images/
+   ```
+
+1. Run this project locally from the command line.
+   ```
+   gcloud preview app run ./app.yaml
+   ```
+
+1. Visit the application at
+   [http://localhost:8080](http://localhost:8080).
+
+## Deploying
+
+1. Use the [Cloud Developer
+   Console](https://console.developer.google.com) to create a
+   project/app id. (App id and project id are identical)
+
+1. Configure gcloud with your app id.
+   ```
+   gcloud config set project <your-app-id>
+   ```
+
+1. Use the [Admin Console](https://appengine.google.com) to view data,
+   queues, and other App Engine specific administration tasks.
+
+1. Use gcloud to deploy your app.
+   ```
+   gcloud preview app deploy ./app.yaml
+   ```
+
+1. Congratulations!  Your application is now live at your-app-id.appspot.com
+
+## Contributing changes
+
+* See [CONTRIBUTING.md](/CONTRIBUTING.md)
+
+## Licensing
+
+* See [LICENSE](/LICENSE)

appengine/images/app.yaml

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+# This file specifies your Python application's runtime configuration
+# including URL routing, versions, static file uploads, etc. See
+# https://developers.google.com/appengine/docs/python/config/appconfig
+# for details.
+
+runtime: python27
+api_version: 1
+threadsafe: yes
+
+# Handlers define how to route requests to your application.
+handlers:
+
+# This handler tells app engine how to route requests to a WSGI application.
+# The script value is in the format <path.to.module>.<wsgi_application>
+# where <wsgi_application> is a WSGI application object.
+- url: .*  # This regex directs all routes to main.app
+  script: main.app

appengine/images/index.yaml

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+indexes:
+
+# AUTOGENERATED
+
+# This index.yaml is automatically updated whenever the dev_appserver
+# detects that a new type of query is run.  If you want to manage the
+# index.yaml file manually, remove the above marker line (the line
+# saying "# AUTOGENERATED").  If you want to manage some indexes
+# manually, move them above the marker line.  The index.yaml file is
+# automatically uploaded to the admin console when you next deploy
+# your application using appcfg.py.
+
+- kind: Greeting
+  ancestor: yes
+  properties:
+  - name: date
+    direction: desc

appengine/images/main.py

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+# Copyright 2015 Google Inc. All rights reserved.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+# [START all]
+
+import cgi
+import urllib
+
+# [START import_images]
+from google.appengine.api import images
+# [END import_images]
+from google.appengine.api import users
+from google.appengine.ext import ndb
+
+import webapp2
+
+
+# [START model]
+class Greeting(ndb.Model):
+    """Models a Guestbook entry with an author, content, avatar, and date."""
+    author = ndb.StringProperty()
+    content = ndb.TextProperty()
+    avatar = ndb.BlobProperty()
+    date = ndb.DateTimeProperty(auto_now_add=True)
+# [END model]
+
+
+def guestbook_key(guestbook_name=None):
+    """Constructs a Datastore key for a Guestbook entity with name."""
+    return ndb.Key('Guestbook', guestbook_name or 'default_guestbook')
+
+
+class MainPage(webapp2.RequestHandler):
+    def get(self):
+        self.response.out.write('<html><body>')
+        guestbook_name = self.request.get('guestbook_name')
+
+        greetings = Greeting.query(
+            ancestor=guestbook_key(guestbook_name)) \
+            .order(-Greeting.date) \
+            .fetch(10)
+
+        for greeting in greetings:
+            if greeting.author:
+                self.response.out.write(
+                    '<b>%s</b> wrote:' % greeting.author)
+            else:
+                self.response.out.write('An anonymous person wrote:')
+            # [START display_image]
+            self.response.out.write('<div><img src="/img?img_id=%s"></img>' %
+                                    greeting.key.urlsafe())
+            self.response.out.write('<blockquote>%s</blockquote></div>' %
+                                    cgi.escape(greeting.content))
+            # [END display_image]
+
+        # [START form]
+        self.response.out.write("""
+              <form action="/sign?%s"
+                    enctype="multipart/form-data"
+                    method="post">
+                <div>
+                  <textarea name="content" rows="3" cols="60"></textarea>
+                </div>
+                <div><label>Avatar:</label></div>
+                <div><input type="file" name="img"/></div>
+                <div><input type="submit" value="Sign Guestbook"></div>
+              </form>
+              <hr>
+              <form>Guestbook name: <input value="%s" name="guestbook_name">
+              <input type="submit" value="switch"></form>
+            </body>
+          </html>""" % (urllib.urlencode({'guestbook_name': guestbook_name}),
+                        cgi.escape(guestbook_name)))
+        # [END form]
+
+
+# [START image_handler]
+class Image(webapp2.RequestHandler):
+    def get(self):
+        greeting_key = ndb.Key(urlsafe=self.request.get('img_id'))
+        greeting = greeting_key.get()
+        if greeting.avatar:
+            self.response.headers['Content-Type'] = 'image/png'
+            self.response.out.write(greeting.avatar)
+        else:
+            self.response.out.write('No image')
+# [END image_handler]
+
+
+# [START sign_handler]
+class Guestbook(webapp2.RequestHandler):
+    def post(self):
+        guestbook_name = self.request.get('guestbook_name')
+        greeting = Greeting(parent=guestbook_key(guestbook_name))
+
+        if users.get_current_user():
+            greeting.author = users.get_current_user().nickname()
+
+        greeting.content = self.request.get('content')
+
+        # [START sign_handler_1]
+        avatar = self.request.get('img')
+        # [END sign_handler_1]
+        # [START transform]
+        avatar = images.resize(avatar, 32, 32)
+        # [END transform]
+        # [START sign_handler_2]
+        greeting.avatar = avatar
+        greeting.put()
+        # [END sign_handler_1]
+
+        self.redirect('/?' + urllib.urlencode(
+            {'guestbook_name': guestbook_name}))
+# [END sign_handler]
+
+
+app = webapp2.WSGIApplication([('/', MainPage),
+                               ('/img', Image),
+                               ('/sign', Guestbook)],
+                              debug=True)
+# [END all]

appengine/images/tests/test_guestbook.py

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+# Copyright 2015 Google Inc. All rights reserved.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+# from the app main.py
+from appengine.images import main
+import mock
+from tests import DatastoreTestbedCase
+
+import webapp2
+
+
+class TestHandlers(DatastoreTestbedCase):
+    def test_hello(self):
+        # Build a request object passing the URI path to be tested.
+        # You can also pass headers, query arguments etc.
+        request = webapp2.Request.blank('/')
+        # Get a response for that request.
+        response = request.get_response(main.app)
+
+        # Let's check if the response is correct.
+        self.assertEqual(response.status_int, 200)
+
+    @mock.patch('appengine.images.main.images')
+    def test_post(self, mock_images):
+        mock_images.resize.return_value = 'asdf'
+        request = webapp2.Request.blank(
+            '/sign',
+            POST={'content': 'asdf'},
+            )
+        response = request.get_response(main.app)
+
+        # Correct response is a redirect
+        self.assertEqual(response.status_int, 302)
+
+    def test_img(self):
+        # Bogus image id, should get error
+        request = webapp2.Request.blank('/img?img_id=123')
+        response = request.get_response(main.app)
+
+        self.assertEqual(response.status_int, 500)
+
+    @mock.patch('appengine.images.main.images')
+    def test_get(self, mock_images):
+        mock_images.resize.return_value = 'asdf'
+        request = webapp2.Request.blank(
+            '/sign',
+            POST={'content': 'asdf'},
+            )
+        response = request.get_response(main.app)
+
+        request = webapp2.Request.blank('/')
+        response = request.get_response(main.app)
+
+        self.assertEqual(response.status_int, 200)