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danielbankhead avatar danielbankhead commented on June 12, 2024

This was historically done by design as not all classes extending from OAuth2Client had, or should have, idTokens. Here are a few that do today (via fetchIdToken):

google-auth-library-nodejs/src/auth/computeclient.ts

Lines 103 to 122 in 1a7ba87

async fetchIdToken(targetAudience: string): Promise<string> {
const idTokenPath =
`service-accounts/${this.serviceAccountEmail}/identity` +
`?format=full&audience=${targetAudience}`;
let idToken: string;
try {
const instanceOptions: gcpMetadata.Options = {
property: idTokenPath,
};
idToken = await gcpMetadata.instance(instanceOptions);
} catch (e) {
if (e instanceof Error) {
e.message = `Could not fetch ID token: ${e.message}`;
}
throw e;
}
return idToken;
}

google-auth-library-nodejs/src/auth/impersonated.ts

Lines 216 to 236 in 1a7ba87

async fetchIdToken(
targetAudience: string,
options?: FetchIdTokenOptions
): Promise<string> {
await this.sourceClient.getAccessToken();
const name = `projects/-/serviceAccounts/${this.targetPrincipal}`;
const u = `${this.endpoint}/v1/${name}:generateIdToken`;
const body = {
delegates: this.delegates,
audience: targetAudience,
includeEmail: options?.includeEmail ?? true,
};
const res = await this.sourceClient.request<FetchIdTokenResponse>({
url: u,
data: body,
method: 'POST',
});
return res.data.token;
}

google-auth-library-nodejs/src/auth/jwtclient.ts

Lines 189 to 207 in 1a7ba87

async fetchIdToken(targetAudience: string): Promise<string> {
// Create a new gToken for fetching an ID token
const gtoken = new GoogleToken({
iss: this.email,
sub: this.subject,
scope: this.scopes || this.defaultScopes,
keyFile: this.keyFile,
key: this.key,
additionalClaims: {target_audience: targetAudience},
transporter: this.transporter,
});
await gtoken.getToken({
forceRefresh: true,
});
if (!gtoken.idToken) {
throw new Error('Unknown error: Failed to fetch ID token');
}
return gtoken.idToken;
}

By chance if you are looking for this functionality in the UserRefreshClient, which extends OAuth2Client, that can be tracked here:

from google-auth-library-nodejs.

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