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<?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 $format The format of the token in the file. Can be null or "json".
* @param string $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;
}
}