Update oauth2 token endpoints

src/core/lib/security/credentials/credentials.h

@@ -64,8 +64,8 @@ typedef enum {
 #define GRPC_COMPUTE_ENGINE_METADATA_TOKEN_PATH \
   "/computeMetadata/v1/instance/service-accounts/default/token"
 
-#define GRPC_GOOGLE_OAUTH2_SERVICE_HOST "www.googleapis.com"
-#define GRPC_GOOGLE_OAUTH2_SERVICE_TOKEN_PATH "/oauth2/v3/token"
+#define GRPC_GOOGLE_OAUTH2_SERVICE_HOST "oauth2.googleapis.com"
+#define GRPC_GOOGLE_OAUTH2_SERVICE_TOKEN_PATH "/token"
 
 #define GRPC_SERVICE_ACCOUNT_POST_BODY_PREFIX                         \
   "grant_type=urn%3Aietf%3Aparams%3Aoauth%3Agrant-type%3Ajwt-bearer&" \

src/core/lib/security/credentials/jwt/json_token.h

@@ -30,7 +30,7 @@
 
 /* --- Constants. --- */
 
-#define GRPC_JWT_OAUTH2_AUDIENCE "https://www.googleapis.com/oauth2/v3/token"
+#define GRPC_JWT_OAUTH2_AUDIENCE "https://oauth2.googleapis.com/token"
 
 /* --- auth_json_key parsing. --- */
 

test/core/security/jwt_verifier_test.cc

@@ -128,9 +128,9 @@ static const char good_openid_config[] =
     " \"issuer\": \"https://accounts.google.com\","
     " \"authorization_endpoint\": "
     "\"https://accounts.google.com/o/oauth2/v2/auth\","
-    " \"token_endpoint\": \"https://www.googleapis.com/oauth2/v4/token\","
+    " \"token_endpoint\": \"https://oauth2.googleapis.com/token\","
     " \"userinfo_endpoint\": \"https://www.googleapis.com/oauth2/v3/userinfo\","
-    " \"revocation_endpoint\": \"https://accounts.google.com/o/oauth2/revoke\","
+    " \"revocation_endpoint\": \"https://oauth2.googleapis.com/revoke\","
     " \"jwks_uri\": \"https://www.googleapis.com/oauth2/v3/certs\""
     "}";