Update GCP Auth to 0.12

src/token_provider.rs

@@ -1,7 +1,5 @@
 use std::sync::Arc;
 
-use gcp_auth::AuthenticationManager;
-
 use crate::error::Result;
 
 pub trait TokenProvider {
@@ -9,18 +7,10 @@ pub trait TokenProvider {
         -> impl std::future::Future<Output = Result<String>> + Send;
 }
 
-impl TokenProvider for Arc<AuthenticationManager> {
+impl TokenProvider for Arc<dyn gcp_auth::TokenProvider> {
     async fn get_token(&self, scope: &[&str]) -> Result<String> {
-        match AuthenticationManager::get_token(self, scope).await {
-            Ok(token) => Ok(token.as_str().to_string()),
-            Err(e) => Err(e.into()),
-        }
-    }
-}
-
-impl TokenProvider for AuthenticationManager {
-    async fn get_token(&self, scope: &[&str]) -> Result<String> {
-        match AuthenticationManager::get_token(self, scope).await {
+        let token = self.token(scope).await;
+        match token {
             Ok(token) => Ok(token.as_str().to_string()),
             Err(e) => Err(e.into()),
         }