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Question:
Specifically, I'd like to use the Gmail API to access my own mail <strong>only</strong>. Is there a way to do this without OAuth and just an API key and/or client id and secret?
Using an API key like:
require('googleapis').gmail('v1').users.messages.list({ auth: '<KEY>', userId: '<EMAIL>') });
yields the following error:
{ errors:
[ { domain: 'global',
reason: 'required',
message: 'Login Required',
locationType: 'header',
location: 'Authorization' } ],
code: 401,
message: 'Login Required' }
I suppose that message means they want a valid OAuth "Authorization" header. I would do that but I suppose that's not possible without presenting a webpage.
Answer1:The strict answer to "Is there a way to do this without OAuth and just an API key and/or client id and secret?" is no.
However, you can achieve what you are looking for using OAuth. You simply need to store a Refresh Token, which you can then use any time to request an Auth Token to access your gmail.
In order to get the refresh token, you can either write a simple web app to do a one time auth, or follow the steps here <a href="https://stackoverflow.com/questions/19766912/how-do-i-authorise-a-background-web-app-without-user-intervention-canonical/19766913#19766913" rel="nofollow">How do I authorise an app (web or installed) without user intervention? (canonical ?)</a> which allows you to do the whole auth flow using the Oauth Playground.
