How to use Google API credentials json on Heroku?

Question

I\'m making an app using Google Calendar API, and planning to build it on Heroku.
I have a problem about authentication. Usually I use credential json file for that, but

Answer 1

You can create the JSON key file by adding a .profile file to the repo, which will be executed when Heroku starts up the container.

Set a config variables:

heroku config:set GOOGLE_APPLICATION_CREDENTIALS=gcp_key.json
heroku config:set GOOGLE_CREDENTIALS=

The GOOGLE_CREDENTIALS is easier to set in the Heroku dashboard.

Create a .profile with a line to write the json file:

echo ${GOOGLE_CREDENTIALS} > /app/gcp_key.json

Obviously, commit the changes to .profile and push to heroku.

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The recommended buildpack doesn't work anymore and, in any case, this feels more direct without being hard.