How to oAuth Google API from Lambda AWS?

google-calendar-api google-api-client alexa
Incpetor picture Incpetor · Feb 11, 2017 · Viewed 12.1k times · Source

I am building Alexa Skill for Google calendar. The client side code works as expected on local machine because I can authenticate the local machine using the link. But, when I deploy the code on AWS Lambda there is no way that I can authenticate as I cannot input code via AWS console.

I am getting trouble in setting up authentication of Google Calendar API when deployed on AWS lambda.

This documentation doesn't help much to me Google Implementing Server Side Authentication

Answer

Bart Kummel picture Bart Kummel · Jul 13, 2018

You should create a service account. Those are designed especially for server-to-server communication. Documentation can be found here: https://developers.google.com/identity/protocols/OAuth2ServiceAccount

The problems with the solutions from other answers are:

  • API keys are insecure
  • Access tokens (e.g. obtained by the CLI command gcloud auth print-access-token) expire. Since Lambdas are stateless, there's no way to store a token temporarily and refresh it when it's expired.

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