allow vendord

vendor/google/auth/src/CredentialSource/FileSource.php

@@ -0,0 +1,87 @@
+<?php
+/*
+ * Copyright 2023 Google Inc.
+ *
+ * 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\CredentialSource;
+
+use Google\Auth\ExternalAccountCredentialSourceInterface;
+use InvalidArgumentException;
+use UnexpectedValueException;
+
+/**
+ * Retrieve a token from a file.
+ */
+class FileSource implements ExternalAccountCredentialSourceInterface
+{
+    private string $file;
+    private ?string $format;
+    private ?string $subjectTokenFieldName;
+
+    /**
+     * @param string $file                       The file to read the subject token from.
+     * @param string|null $format                The format of the token in the file. Can be null or "json".
+     * @param string|null $subjectTokenFieldName The name of the field containing the token in the file. This is required
+     *                                           when format is "json".
+     */
+    public function __construct(
+        string $file,
+        ?string $format = null,
+        ?string $subjectTokenFieldName = null
+    ) {
+        $this->file = $file;
+
+        if ($format === 'json' && is_null($subjectTokenFieldName)) {
+            throw new InvalidArgumentException(
+                'subject_token_field_name must be set when format is JSON'
+            );
+        }
+
+        $this->format = $format;
+        $this->subjectTokenFieldName = $subjectTokenFieldName;
+    }
+
+    public function fetchSubjectToken(?callable $httpHandler = null): string
+    {
+        $contents = file_get_contents($this->file);
+        if ($this->format === 'json') {
+            if (!$json = json_decode((string) $contents, true)) {
+                throw new UnexpectedValueException(
+                    'Unable to decode JSON file'
+                );
+            }
+            if (!isset($json[$this->subjectTokenFieldName])) {
+                throw new UnexpectedValueException(
+                    'subject_token_field_name not found in JSON file'
+                );
+            }
+            $contents = $json[$this->subjectTokenFieldName];
+        }
+
+        return $contents;
+    }
+
+    /**
+     * Gets the unique key for caching.
+     * The format for the cache key one of the following:
+     * Filename
+     *
+     * @return string
+     */
+    public function getCacheKey(): ?string
+    {
+        return $this->file;
+    }
+}