Using Google API to retrieve Gmail data in Java by accessing it with an id_token obtained from JavaScript

Utilizing the gapi in JavaScript via OAuth2 to retrieve 

googleUser.getAuthResponse().id_token
, which I then send to my server. My goal is to utilize the Java API to interact with the Gmail API and list messages on the account. However, I'm encountering the following error when attempting to access it:

[error] com.google.api.client.googleapis.json.GoogleJsonResponseException: 401 Unauthorized
[error] {
[error]   "code" : 401,
[error]   "errors" : [ {
[error]     "domain" : "global",
[error]     "location" : "Authorization",
[error]     "locationType" : "header",
[error]     "message" : "Invalid Credentials",
[error]     "reason" : "authError"
[error]   } ],
[error]   "message" : "Invalid Credentials"
[error] }

Apologies for the Scala code snippet, but here is the implementation I'm using:

val gmail = new Gmail.Builder(transport, jsonFactory, credential)
        .setApplicationName("myapp")
        .build()
val response = gmail.users().messages().list(userId).execute()

The userId is obtained successfully from the Java API's profile lookup, but accessing the Gmail instance is where the issue arises. Despite searching extensively, I have not found a solution tailored to this particular scenario.

javascriptjavagoogle-apigmail-apigoogle-oauth

Answer №1

After a lot of searching and navigating through confusing Google content, I eventually realized my mistake of using user.getAuthResponse().id_token instead of 

user.getAuthResponse().access_token
. It's frustrating that this information wasn't readily available, but hopefully my experience can assist others in similar situations.

Constructing the GoogleCredential was straightforward:

private val credential = new GoogleCredential.Builder().build().setAccessToken(accessToken)

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