add support for google service accounts

[mtuchi]

Summary

Added support for Service Accounts credential type in gmail, googlesheets and googledrive adaptor

Related

• Add google service-accounts user guidance on credential page docs#777

Details

Service Account credentials requires private_key, client_email, and scopes. I have modify createConnection function to check if private_key and client_email is specified in state.configuration to use JWT auth otherwise we default to use OAuth2 auth.

Mandatory scopes are currently hardcoded for each adaptor. I used the mandatory scope specified on app when creation OAuth credential for each each adaptor (gmail, googlesheets and googledrive).

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Review Checklist

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• Does the PR do what it claims to do?
• If this is a new adaptor, added the adaptor on marketing website ?
• If this PR includes breaking changes, do we need to update any jobs in
  production? Is it safe to release?
• Are there any unit tests?
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  dev only changes don't need a changeset.
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[mtuchi]

Hiya @hunterachieng can you give this pr, I was able to test, GoogleDrive and GoogleSheets adaptor but Gmail adaptor is failing with an error saying "Error sending message: Precondition check failed. I think the error has nothing to do with how we are handling service account credential rather on admin settings to allow the service account permission to read and compose email

[mtuchi]

@hunterachieng see my walk through video
https://www.loom.com/share/0bcb55300e39480fb914551747abcc39

[hunterachieng]

@mtuchi I see you mentioned that we have Gmail code, but then you have mentioned that it fails. Should we fix this first or?

[mtuchi]

@mtuchi I see you mentioned that we have Gmail code, but then you have mentioned that it fails. Should we fix this first or?

@hunterachieng it's not failing because of the changes, it's failing because of permission, can you spend sometime to figure out the permission we need ?

[mtuchi]

I am worried this will break on lightning 🤔

[mtuchi]

@josephjclark would love you're input on this, I think lightning is expecting required filed not "oneOf".
Should we have have two different schema maybe 🤷🏽 ? But again lightning need to support both of those schema

[mtuchi]

Hey @hunterachieng when you get sometime please review this pr again for me, I have updated the README.md for updated adaptors