Send a card to Google Glass daily via App Engine + Cron

This sample is an App Engine application that sends a daily card to Google Glass. It uses Google+ Sign In to handle authentication and then uses App Engine's cron to send a card to uses at the defined time.

Prerequisites

1. Create a new project in the Google Developers Console,
2. Enable Mirror API and Google+ API. Note, this differs from the other Glass quickstarts (they make reference to the deprecated profile.info scope and don't require Google+).
3. Create a new client id for web application under APIs & auth > Credentials. Make sure to add your redirect uri as http://localhost:8080/oauth2callback for local testing and https://SOMENAME.appspot.com/oauth2callback for deployment.

Setup

1. Clone this repo

git clone https://github.com/justinribeiro/glass-daily-card.git

2. Install the requirements so that our project will run (Flask, kvsession, httplib2, et cetera)

pip install -r requirements.txt -t lib

3. Replace client_secrets.json with the credentials you created in step 3 of the prerequisites (use "Download JSON" button).
4. Replace the content for the google-signin-clientid meta tag in templates/base.html with your web application client id. Maybe visit the link in the comment above that line and learn more about page level configuration for Google+ Sign In.
5. Change the application project id in app.yaml.
6. Run the application via

dev_appserver.py .

6. Browse to http://localhost:8080/ to see the application running.

Scheduling cards to send

Because this is a bare bones sample application, it has no admin interface. Instead, we rely on the Datastore Viewer to manage the CronCards data. To get started:

1. Create a CronCard. The model, while defined in the application (see models.py), doesn't exist in the datastore because we have inserted any data. To do so, visit http://localhost:8080/samplesforcron which will insert a single CronCard into our datastore with the date set to today.
2. Edit or Adding CronCards. By navigating to the local admin panel (http://localhost:8000/) we can view, edit and add to the CronCards data store as needed. This would be under the "Cloud Datastore" in production App Engine.

Running the cron job

1. The cron job is scheduled via cron.yaml. To understand more about how cron works on App Engine, I highly recommend the documentation.
2. In development, the cron job will not run at the defined time. You need to kick the job off manually to test via the local admin console http://localhost:8000/

General questions

Some general questions that are highly likely to come up.

Why doesn't it send HTML?

Because I specifically set the body of the timeline card to text. You can change it html if you like.

Why can't I define custom menu options?

It's a sample application to get you started, you can add as many menu options as you like if you want to expand the code. View the timelinecard_body in dailyjob() in main.py to see how the menu options are setup.