// TokenSource returns a TokenSource that returns t until t expires,
// automatically refreshing it as necessary using the provided context and the
// client ID and client secret.
//
// Most users will use Config.Client instead.
func (c *Config) TokenSource(ctx context.Context) oauth2.TokenSource {
	source := &tokenSource{
		ctx:  ctx,
		conf: c,
	}
	return oauth2.ReuseTokenSource(nil, source)
}
Example #2
0
// JWTAccessTokenSourceFromJSON uses a Google Developers service account JSON
// key file to read the credentials that authorize and authenticate the
// requests, and returns a TokenSource that does not use any OAuth2 flow but
// instead creates a JWT and sends that as the access token.
// The audience is typically a URL that specifies the scope of the credentials.
//
// Note that this is not a standard OAuth flow, but rather an
// optimization supported by a few Google services.
// Unless you know otherwise, you should use JWTConfigFromJSON instead.
func JWTAccessTokenSourceFromJSON(jsonKey []byte, audience string) (oauth2.TokenSource, error) {
	cfg, err := JWTConfigFromJSON(jsonKey)
	if err != nil {
		return nil, fmt.Errorf("google: could not parse JSON key: %v", err)
	}
	pk, err := internal.ParseKey(cfg.PrivateKey)
	if err != nil {
		return nil, fmt.Errorf("google: could not parse key: %v", err)
	}
	ts := &jwtAccessTokenSource{
		email:    cfg.Email,
		audience: audience,
		pk:       pk,
	}
	tok, err := ts.Token()
	if err != nil {
		return nil, err
	}
	return oauth2.ReuseTokenSource(tok, ts), nil
}
Example #3
0
// TokenSource returns a JWT TokenSource using the configuration
// in c and the HTTP client from the provided context.
func (c *Config) TokenSource(ctx context.Context) oauth2.TokenSource {
	return oauth2.ReuseTokenSource(nil, jwtSource{ctx, c})
}
Example #4
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// ComputeTokenSource returns a token source that fetches access tokens
// from Google Compute Engine (GCE)'s metadata server. It's only valid to use
// this token source if your program is running on a GCE instance.
// If no account is specified, "default" is used.
// Further information about retrieving access tokens from the GCE metadata
// server can be found at https://cloud.google.com/compute/docs/authentication.
func ComputeTokenSource(account string) oauth2.TokenSource {
	return oauth2.ReuseTokenSource(nil, computeSource{account: account})
}