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system/vendor/google/auth/src/ProjectIdProviderInterface.php

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+<?php
+/*
+ * Copyright 2020 Google LLC
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+namespace Google\Auth;
+
+/**
+ * Describes a Credentials object which supports fetching the project ID.
+ */
+interface ProjectIdProviderInterface
+{
+    /**
+     * Get the project ID.
+     *
+     * @param callable $httpHandler Callback which delivers psr7 request
+     * @return string|null
+     */
+    public function getProjectId(callable $httpHandler = null);
+}