class FileUploadTest

class FileUploadTest extends ResourceTestBase {
    
    /**
     * {@inheritdoc}
     */
    protected static $modules = [
        'entity_test',
        'file',
    ];
    
    /**
     * {@inheritdoc}
     */
    protected $defaultTheme = 'stark';
    
    /**
     * {@inheritdoc}
     *
     * @see $entity
     */
    protected static $entityTypeId = 'entity_test';
    
    /**
     * {@inheritdoc}
     *
     * @see $entity
     */
    protected static $resourceTypeName = 'entity_test--entity_test';
    
    /**
     * The POST URI.
     *
     * @var string
     */
    protected static $postUri = '/jsonapi/entity_test/entity_test/field_rest_file_test';
    
    /**
     * Test file data.
     *
     * @var string
     */
    protected $testFileData = 'Hares sit on chairs, and mules sit on stools.';
    
    /**
     * The test field storage config.
     *
     * @var \Drupal\field\Entity\FieldStorageConfig
     */
    protected $fieldStorage;
    
    /**
     * The field config.
     *
     * @var \Drupal\field\Entity\FieldConfig
     */
    protected $field;
    
    /**
     * The parent entity.
     *
     * @var \Drupal\Core\Entity\EntityInterface
     */
    protected $entity;
    
    /**
     * Created file entity.
     *
     * @var \Drupal\file\Entity\File
     */
    protected $file;
    
    /**
     * An authenticated user.
     *
     * @var \Drupal\user\UserInterface
     */
    protected $user;
    
    /**
     * The entity storage for the 'file' entity type.
     *
     * @var \Drupal\Core\Entity\EntityStorageInterface
     */
    protected $fileStorage;
    
    /**
     * A list of test methods to skip.
     *
     * @var array
     */
    const SKIP_METHODS = [
        'testGetIndividual',
        'testIndividual',
        'testCollection',
        'testRelationships',
    ];
    
    /**
     * {@inheritdoc}
     */
    protected function setUp() : void {
        if (in_array($this->name(), static::SKIP_METHODS, TRUE)) {
            $this->markTestSkipped('Irrelevant for this test');
        }
        parent::setUp();
        $this->fileStorage = $this->container
            ->get('entity_type.manager')
            ->getStorage('file');
        // Add a file field.
        $this->fieldStorage = FieldStorageConfig::create([
            'entity_type' => 'entity_test',
            'field_name' => 'field_rest_file_test',
            'type' => 'file',
            'settings' => [
                'uri_scheme' => 'public',
            ],
        ])->setCardinality(FieldStorageDefinitionInterface::CARDINALITY_UNLIMITED);
        $this->fieldStorage
            ->save();
        $this->field = FieldConfig::create([
            'entity_type' => 'entity_test',
            'field_name' => 'field_rest_file_test',
            'bundle' => 'entity_test',
            'settings' => [
                'file_directory' => 'foobar',
                'file_extensions' => 'txt',
                'max_filesize' => '',
            ],
        ])->setLabel('Test file field')
            ->setTranslatable(FALSE);
        $this->field
            ->save();
        // Reload entity so that it has the new field.
        $this->entity = $this->entityStorage
            ->loadUnchanged($this->entity
            ->id());
    }
    
    /**
     * {@inheritdoc}
     */
    protected function createEntity() {
        // Create an entity that a file can be attached to.
        $entity_test = EntityTest::create([
            'name' => 'Llama',
            'type' => 'entity_test',
        ]);
        $entity_test->setOwnerId($this->account
            ->id());
        $entity_test->save();
        return $entity_test;
    }
    
    /**
     * {@inheritdoc}
     */
    public function testRelated() : void {
        \Drupal::service('router.builder')->rebuild();
        parent::testRelated();
    }
    
    /**
     * Tests using the file upload POST route; needs second request to "use" file.
     */
    public function testPostFileUpload() : void {
        \Drupal::service('router.builder')->rebuild();
        $uri = Url::fromUri('base:' . static::$postUri);
        // DX: 405 when read-only mode is enabled.
        $response = $this->fileRequest($uri, $this->testFileData);
        $this->assertResourceErrorResponse(405, sprintf("JSON:API is configured to accept only read operations. Site administrators can configure this at %s.", Url::fromUri('base:/admin/config/services/jsonapi')->setAbsolute()
            ->toString(TRUE)
            ->getGeneratedUrl()), $uri, $response);
        $this->assertSame([
            'GET',
        ], $response->getHeader('Allow'));
        $this->config('jsonapi.settings')
            ->set('read_only', FALSE)
            ->save(TRUE);
        // DX: 403 when unauthorized.
        $response = $this->fileRequest($uri, $this->testFileData);
        $this->assertResourceErrorResponse(403, $this->getExpectedUnauthorizedAccessMessage('POST'), $uri, $response);
        $this->setUpAuthorization('POST');
        // 404 when the field name is invalid.
        $invalid_uri = Url::fromUri('base:' . static::$postUri . '_invalid');
        $response = $this->fileRequest($invalid_uri, $this->testFileData);
        $this->assertResourceErrorResponse(404, 'Field "field_rest_file_test_invalid" does not exist.', $invalid_uri, $response);
        // This request will have the default 'application/octet-stream' content
        // type header.
        $response = $this->fileRequest($uri, $this->testFileData);
        $this->assertSame(201, $response->getStatusCode());
        $expected = $this->getExpectedDocument();
        $this->assertResponseData($expected, $response);
        // Check the actual file data.
        $this->assertSame($this->testFileData, file_get_contents('public://foobar/example.txt'));
        // Test the file again but using 'filename' in the Content-Disposition
        // header with no 'file' prefix.
        $response = $this->fileRequest($uri, $this->testFileData, [
            'Content-Disposition' => 'filename="example.txt"',
        ]);
        $this->assertSame(201, $response->getStatusCode());
        $expected = $this->getExpectedDocument(2, 'example_0.txt', TRUE);
        $this->assertResponseData($expected, $response);
        // Check the actual file data.
        $this->assertSame($this->testFileData, file_get_contents('public://foobar/example_0.txt'));
        $this->assertTrue($this->fileStorage
            ->loadUnchanged(1)
            ->isTemporary());
        // Verify that we can create an entity that references the uploaded file.
        $entity_test_post_url = Url::fromRoute('jsonapi.entity_test--entity_test.collection.post');
        $request_options = [];
        $request_options[RequestOptions::HEADERS]['Content-Type'] = 'application/vnd.api+json';
        $request_options = NestedArray::mergeDeep($request_options, $this->getAuthenticationRequestOptions());
        $request_options[RequestOptions::BODY] = Json::encode($this->getPostDocument());
        $response = $this->request('POST', $entity_test_post_url, $request_options);
        $this->assertResourceResponse(201, FALSE, $response);
        $this->assertTrue($this->fileStorage
            ->loadUnchanged(1)
            ->isPermanent());
        $this->assertSame([
            [
                'target_id' => '1',
                'display' => NULL,
                'description' => "The most fascinating file ever!",
            ],
        ], EntityTest::load(2)->get('field_rest_file_test')
            ->getValue());
    }
    
    /**
     * Tests using the 'file upload and "use" file in single request" POST route.
     */
    public function testPostFileUploadAndUseInSingleRequest() : void {
        \Drupal::service('router.builder')->rebuild();
        // Update the test entity so it already has a file. This allows verifying
        // that this route appends files, and does not replace them.
        mkdir('public://foobar');
        file_put_contents('public://foobar/existing.txt', $this->testFileData);
        $existing_file = File::create([
            'uri' => 'public://foobar/existing.txt',
        ]);
        $existing_file->setOwnerId($this->account
            ->id());
        $existing_file->setPermanent();
        $existing_file->save();
        $this->entity
            ->set('field_rest_file_test', [
            'target_id' => $existing_file->id(),
        ])
            ->save();
        $uri = Url::fromUri('base:' . '/jsonapi/entity_test/entity_test/' . $this->entity
            ->uuid() . '/field_rest_file_test');
        // DX: 405 when read-only mode is enabled.
        $response = $this->fileRequest($uri, $this->testFileData);
        $this->assertResourceErrorResponse(405, sprintf("JSON:API is configured to accept only read operations. Site administrators can configure this at %s.", Url::fromUri('base:/admin/config/services/jsonapi')->setAbsolute()
            ->toString(TRUE)
            ->getGeneratedUrl()), $uri, $response);
        $this->assertSame([
            'GET',
        ], $response->getHeader('Allow'));
        $this->config('jsonapi.settings')
            ->set('read_only', FALSE)
            ->save(TRUE);
        // DX: 403 when unauthorized.
        $response = $this->fileRequest($uri, $this->testFileData);
        $this->assertResourceErrorResponse(403, $this->getExpectedUnauthorizedAccessMessage('PATCH'), $uri, $response);
        $this->setUpAuthorization('PATCH');
        // 404 when the field name is invalid.
        $invalid_uri = Url::fromUri($uri->getUri() . '_invalid');
        $response = $this->fileRequest($invalid_uri, $this->testFileData);
        $this->assertResourceErrorResponse(404, 'Field "field_rest_file_test_invalid" does not exist.', $invalid_uri, $response);
        // This request fails despite the upload succeeding, because we're not
        // allowed to view the entity we're uploading to.
        $response = $this->fileRequest($uri, $this->testFileData);
        $this->assertResourceErrorResponse(403, $this->getExpectedUnauthorizedAccessMessage('GET'), $uri, $response, FALSE, [
            '4xx-response',
            'http_response',
        ], [
            'url.query_args',
            'url.site',
            'user.permissions',
        ]);
        $this->setUpAuthorization('GET');
        // Re-uploading the same file will result in the file being uploaded twice
        // and referenced twice.
        $response = $this->fileRequest($uri, $this->testFileData);
        $this->assertSame(200, $response->getStatusCode());
        $expected = [
            'jsonapi' => [
                'meta' => [
                    'links' => [
                        'self' => [
                            'href' => 'http://jsonapi.org/format/1.0/',
                        ],
                    ],
                ],
                'version' => '1.0',
            ],
            'links' => [
                'self' => [
                    'href' => Url::fromUri('base:/jsonapi/entity_test/entity_test/' . $this->entity
                        ->uuid() . '/field_rest_file_test')
                        ->setAbsolute(TRUE)
                        ->toString(),
                ],
            ],
            'data' => [
                0 => $this->getExpectedDocument(1, 'existing.txt', TRUE, TRUE)['data'],
                1 => $this->getExpectedDocument(2, 'example.txt', TRUE, TRUE)['data'],
                2 => $this->getExpectedDocument(3, 'example_0.txt', TRUE, TRUE)['data'],
            ],
        ];
        $this->assertResponseData($expected, $response);
        // The response document received for the POST request is identical to the
        // response document received by GETting the same URL.
        $request_options = [];
        $request_options[RequestOptions::HEADERS]['Content-Type'] = 'application/vnd.api+json';
        $request_options = NestedArray::mergeDeep($request_options, $this->getAuthenticationRequestOptions());
        $response = $this->request('GET', $uri, $request_options);
        $this->assertSame(200, $response->getStatusCode());
        $this->assertResponseData($expected, $response);
        // Check the actual file data.
        $this->assertSame($this->testFileData, file_get_contents('public://foobar/example.txt'));
        $this->assertSame($this->testFileData, file_get_contents('public://foobar/example_0.txt'));
    }
    
    /**
     * Returns the JSON:API POST document referencing the uploaded file.
     *
     * @return array
     *   A JSON:API request document.
     *
     * @see ::testPostFileUpload()
     * @see \Drupal\Tests\jsonapi\Functional\EntityTestTest::getPostDocument()
     */
    protected function getPostDocument() : array {
        return [
            'data' => [
                'type' => 'entity_test--entity_test',
                'attributes' => [
                    'name' => 'Drama llama',
                ],
                'relationships' => [
                    'field_rest_file_test' => [
                        'data' => [
                            'id' => File::load(1)->uuid(),
                            'meta' => [
                                'description' => 'The most fascinating file ever!',
                            ],
                            'type' => 'file--file',
                        ],
                    ],
                ],
            ],
        ];
    }
    
    /**
     * Tests using the file upload POST route with invalid headers.
     */
    protected function testPostFileUploadInvalidHeaders() : void {
        $uri = Url::fromUri('base:' . static::$postUri);
        // The wrong content type header should return a 415 code.
        $response = $this->fileRequest($uri, $this->testFileData, [
            'Content-Type' => 'application/vnd.api+json',
        ]);
        $this->assertSame(415, $response->getStatusCode());
        // An empty Content-Disposition header should return a 400.
        $response = $this->fileRequest($uri, $this->testFileData, [
            'Content-Disposition' => FALSE,
        ]);
        $this->assertResourceErrorResponse(400, '"Content-Disposition" header is required. A file name in the format "filename=FILENAME" must be provided.', $uri, $response);
        // An empty filename with a context in the Content-Disposition header should
        // return a 400.
        $response = $this->fileRequest($uri, $this->testFileData, [
            'Content-Disposition' => 'file; filename=""',
        ]);
        $this->assertResourceErrorResponse(400, 'No filename found in "Content-Disposition" header. A file name in the format "filename=FILENAME" must be provided.', $uri, $response);
        // An empty filename without a context in the Content-Disposition header
        // should return a 400.
        $response = $this->fileRequest($uri, $this->testFileData, [
            'Content-Disposition' => 'filename=""',
        ]);
        $this->assertResourceErrorResponse(400, 'No filename found in "Content-Disposition" header. A file name in the format "filename=FILENAME" must be provided.', $uri, $response);
        // An invalid key-value pair in the Content-Disposition header should return
        // a 400.
        $response = $this->fileRequest($uri, $this->testFileData, [
            'Content-Disposition' => 'not_a_filename="example.txt"',
        ]);
        $this->assertResourceErrorResponse(400, 'No filename found in "Content-Disposition" header. A file name in the format "filename=FILENAME" must be provided.', $uri, $response);
        // Using filename* extended format is not currently supported.
        $response = $this->fileRequest($uri, $this->testFileData, [
            'Content-Disposition' => 'filename*="UTF-8 \' \' example.txt"',
        ]);
        $this->assertResourceErrorResponse(400, 'The extended "filename*" format is currently not supported in the "Content-Disposition" header.', $uri, $response);
    }
    
    /**
     * Tests using the file upload POST route with a duplicate file name.
     *
     * A new file should be created with a suffixed name.
     */
    public function testPostFileUploadDuplicateFile() : void {
        \Drupal::service('router.builder')->rebuild();
        $this->setUpAuthorization('POST');
        $this->config('jsonapi.settings')
            ->set('read_only', FALSE)
            ->save(TRUE);
        $uri = Url::fromUri('base:' . static::$postUri);
        // This request will have the default 'application/octet-stream' content
        // type header.
        $response = $this->fileRequest($uri, $this->testFileData);
        $this->assertSame(201, $response->getStatusCode());
        // Make the same request again. The file should be saved as a new file
        // entity that has the same file name but a suffixed file URI.
        $response = $this->fileRequest($uri, $this->testFileData);
        $this->assertSame(201, $response->getStatusCode());
        // Loading expected normalized data for file 2, the duplicate file.
        $expected = $this->getExpectedDocument(2, 'example_0.txt', TRUE);
        $this->assertResponseData($expected, $response);
        // Check the actual file data.
        $this->assertSame($this->testFileData, file_get_contents('public://foobar/example_0.txt'));
        // Simulate a race condition where two files are uploaded at almost the same
        // time, by removing the first uploaded file from disk (leaving the entry in
        // the file_managed table) before trying to upload another file with the
        // same name.
        unlink(\Drupal::service('file_system')->realpath('public://foobar/example.txt'));
        // Make the same request again. The upload should fail validation.
        $response = $this->fileRequest($uri, $this->testFileData);
        $this->assertResourceErrorResponse(422, PlainTextOutput::renderFromHtml("Unprocessable Entity: file validation failed.\nThe file public://foobar/example.txt already exists. Enter a unique file URI."), $uri, $response);
    }
    
    /**
     * Tests using the file upload route with any path prefixes being stripped.
     *
     * @see https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Content-Disposition#Directives
     */
    public function testFileUploadStrippedFilePath() : void {
        \Drupal::service('router.builder')->rebuild();
        $this->setUpAuthorization('POST');
        $this->config('jsonapi.settings')
            ->set('read_only', FALSE)
            ->save(TRUE);
        $uri = Url::fromUri('base:' . static::$postUri);
        $response = $this->fileRequest($uri, $this->testFileData, [
            'Content-Disposition' => 'file; filename="directory/example.txt"',
        ]);
        $this->assertSame(201, $response->getStatusCode());
        $expected = $this->getExpectedDocument();
        $this->assertResponseData($expected, $response);
        // Check the actual file data. It should have been written to the configured
        // directory, not /foobar/directory/example.txt.
        $this->assertSame($this->testFileData, file_get_contents('public://foobar/example.txt'));
        $response = $this->fileRequest($uri, $this->testFileData, [
            'Content-Disposition' => 'file; filename="../../example_2.txt"',
        ]);
        $this->assertSame(201, $response->getStatusCode());
        $expected = $this->getExpectedDocument(2, 'example_2.txt', TRUE);
        $this->assertResponseData($expected, $response);
        // Check the actual file data. It should have been written to the configured
        // directory, not /foobar/directory/example.txt.
        $this->assertSame($this->testFileData, file_get_contents('public://foobar/example_2.txt'));
        $this->assertFileDoesNotExist('../../example_2.txt');
        // Check a path from the root. Extensions have to be empty to allow a file
        // with no extension to pass validation.
        $this->field
            ->setSetting('file_extensions', '')
            ->save();
        \Drupal::service('router.builder')->rebuild();
        $response = $this->fileRequest($uri, $this->testFileData, [
            'Content-Disposition' => 'file; filename="/etc/passwd"',
        ]);
        $this->assertSame(201, $response->getStatusCode());
        $expected = $this->getExpectedDocument(3, 'passwd', TRUE);
        // This mime will be guessed as there is no extension.
        $expected['data']['attributes']['filemime'] = 'application/octet-stream';
        $this->assertResponseData($expected, $response);
        // Check the actual file data. It should have been written to the configured
        // directory, not /foobar/directory/example.txt.
        $this->assertSame($this->testFileData, file_get_contents('public://foobar/passwd'));
    }
    
    /**
     * Tests invalid file uploads.
     */
    public function testInvalidFileUploads() : void {
        \Drupal::service('router.builder')->rebuild();
        $this->setUpAuthorization('POST');
        $this->config('jsonapi.settings')
            ->set('read_only', FALSE)
            ->save(TRUE);
        $this->testFileUploadInvalidFileType();
        $this->testPostFileUploadInvalidHeaders();
        $this->testFileUploadLargerFileSize();
        $this->testFileUploadMaliciousExtension();
    }
    
    /**
     * Tests using the file upload route with a unicode file name.
     */
    public function testFileUploadUnicodeFilename() : void {
        \Drupal::service('router.builder')->rebuild();
        $this->setUpAuthorization('POST');
        $this->config('jsonapi.settings')
            ->set('read_only', FALSE)
            ->save(TRUE);
        $uri = Url::fromUri('base:' . static::$postUri);
        // It is important that the filename starts with a unicode character. See
        // https://bugs.php.net/bug.php?id=77239.
        $response = $this->fileRequest($uri, $this->testFileData, [
            'Content-Disposition' => 'file; filename="Èxample-✓.txt"',
        ]);
        $this->assertSame(201, $response->getStatusCode());
        $expected = $this->getExpectedDocument(1, 'Èxample-✓.txt', TRUE);
        $this->assertResponseData($expected, $response);
        $this->assertSame($this->testFileData, file_get_contents('public://foobar/Èxample-✓.txt'));
    }
    
    /**
     * Tests using the file upload route with a zero byte file.
     */
    public function testFileUploadZeroByteFile() : void {
        \Drupal::service('router.builder')->rebuild();
        $this->setUpAuthorization('POST');
        $this->config('jsonapi.settings')
            ->set('read_only', FALSE)
            ->save(TRUE);
        $uri = Url::fromUri('base:' . static::$postUri);
        // Test with a zero byte file.
        $response = $this->fileRequest($uri, NULL);
        $this->assertSame(201, $response->getStatusCode());
        $expected = $this->getExpectedDocument();
        // Modify the default expected data to account for the 0 byte file.
        $expected['data']['attributes']['filesize'] = 0;
        $this->assertResponseData($expected, $response);
        // Check the actual file data.
        $this->assertSame('', file_get_contents('public://foobar/example.txt'));
    }
    
    /**
     * Tests using the file upload route with an invalid file type.
     */
    protected function testFileUploadInvalidFileType() : void {
        $uri = Url::fromUri('base:' . static::$postUri);
        // Test with a JSON file.
        $response = $this->fileRequest($uri, '{"test":123}', [
            'Content-Disposition' => 'filename="example.json"',
        ]);
        $this->assertResourceErrorResponse(422, PlainTextOutput::renderFromHtml("Unprocessable Entity: file validation failed.\nOnly files with the following extensions are allowed: <em class=\"placeholder\">txt</em>."), $uri, $response);
        // Make sure that no file was saved.
        $this->assertEmpty(File::load(1));
        $this->assertFileDoesNotExist('public://foobar/example.txt');
    }
    
    /**
     * Tests using the file upload route with a file size larger than allowed.
     */
    protected function testFileUploadLargerFileSize() : void {
        // Set a limit of 50 bytes.
        $this->field
            ->setSetting('max_filesize', 50)
            ->save();
        \Drupal::service('router.builder')->rebuild();
        $uri = Url::fromUri('base:' . static::$postUri);
        // Generate a string larger than the 50 byte limit set.
        $response = $this->fileRequest($uri, $this->randomString(100));
        $this->assertResourceErrorResponse(422, PlainTextOutput::renderFromHtml("Unprocessable Entity: file validation failed.\nThe file is <em class=\"placeholder\">100 bytes</em> exceeding the maximum file size of <em class=\"placeholder\">50 bytes</em>."), $uri, $response);
        // Make sure that no file was saved.
        $this->assertEmpty(File::load(1));
        $this->assertFileDoesNotExist('public://foobar/example.txt');
    }
    
    /**
     * Tests using the file upload POST route with malicious extensions.
     */
    protected function testFileUploadMaliciousExtension() : void {
        // Allow all file uploads but system.file::allow_insecure_uploads is set to
        // FALSE.
        $this->field
            ->setSetting('file_extensions', '')
            ->save();
        $uri = Url::fromUri('base:' . static::$postUri);
        $php_string = '<?php print "Drupal"; ?>';
        // Test using a masked exploit file.
        $response = $this->fileRequest($uri, $php_string, [
            'Content-Disposition' => 'filename="example.php"',
        ]);
        // The filename is not munged because .txt is added and it is a known
        // extension to apache.
        $expected = $this->getExpectedDocument(1, 'example.php_.txt', TRUE);
        // Override the expected filesize.
        $expected['data']['attributes']['filesize'] = strlen($php_string);
        $this->assertResponseData($expected, $response);
        $this->assertFileExists('public://foobar/example.php_.txt');
        // Add .php and .txt as allowed extensions. Since 'allow_insecure_uploads'
        // is FALSE, .php files should be renamed to have a .txt extension.
        $this->field
            ->setSetting('file_extensions', 'php txt')
            ->save();
        $response = $this->fileRequest($uri, $php_string, [
            'Content-Disposition' => 'filename="example_2.php"',
        ]);
        $expected = $this->getExpectedDocument(2, 'example_2.php_.txt', TRUE);
        // Override the expected filesize.
        $expected['data']['attributes']['filesize'] = strlen($php_string);
        $this->assertResponseData($expected, $response);
        $this->assertFileExists('public://foobar/example_2.php_.txt');
        $this->assertFileDoesNotExist('public://foobar/example_2.php');
        // Allow .doc file uploads and ensure even a mis-configured apache will not
        // fallback to php because the filename will be munged.
        $this->field
            ->setSetting('file_extensions', 'doc')
            ->save();
        // Test using a masked exploit file.
        $response = $this->fileRequest($uri, $php_string, [
            'Content-Disposition' => 'filename="example_3.php.doc"',
        ]);
        // The filename is munged.
        $expected = $this->getExpectedDocument(3, 'example_3.php_.doc', TRUE);
        // Override the expected filesize.
        $expected['data']['attributes']['filesize'] = strlen($php_string);
        // The file mime should be 'application/msword'.
        $expected['data']['attributes']['filemime'] = 'application/msword';
        $this->assertResponseData($expected, $response);
        $this->assertFileExists('public://foobar/example_3.php_.doc');
        $this->assertFileDoesNotExist('public://foobar/example_3.php.doc');
        // Test that a dangerous extension such as .php is munged even if it is in
        // the list of allowed extensions.
        $this->field
            ->setSetting('file_extensions', 'doc php')
            ->save();
        // Test using a masked exploit file.
        $response = $this->fileRequest($uri, $php_string, [
            'Content-Disposition' => 'filename="example_4.php.doc"',
        ]);
        // The filename is munged.
        $expected = $this->getExpectedDocument(4, 'example_4.php_.doc', TRUE);
        // Override the expected filesize.
        $expected['data']['attributes']['filesize'] = strlen($php_string);
        // The file mime should be 'application/msword'.
        $expected['data']['attributes']['filemime'] = 'application/msword';
        $this->assertResponseData($expected, $response);
        $this->assertFileExists('public://foobar/example_4.php_.doc');
        $this->assertFileDoesNotExist('public://foobar/example_4.php.doc');
        // Dangerous extensions are munged even when all extensions are allowed.
        $this->field
            ->setSetting('file_extensions', '')
            ->save();
        $response = $this->fileRequest($uri, $php_string, [
            'Content-Disposition' => 'filename="example_5.php.png"',
        ]);
        $expected = $this->getExpectedDocument(5, 'example_5.php_.png', TRUE);
        // Override the expected filesize.
        $expected['data']['attributes']['filesize'] = strlen($php_string);
        // The file mime should still see this as a PNG image.
        $expected['data']['attributes']['filemime'] = 'image/png';
        $this->assertResponseData($expected, $response);
        $this->assertFileExists('public://foobar/example_5.php_.png');
        // Dangerous extensions are munged if is renamed to end in .txt.
        $response = $this->fileRequest($uri, $php_string, [
            'Content-Disposition' => 'filename="example_6.cgi.png.txt"',
        ]);
        $expected = $this->getExpectedDocument(6, 'example_6.cgi_.png_.txt', TRUE);
        // Override the expected filesize.
        $expected['data']['attributes']['filesize'] = strlen($php_string);
        // The file mime should also now be text.
        $expected['data']['attributes']['filemime'] = 'text/plain';
        $this->assertResponseData($expected, $response);
        $this->assertFileExists('public://foobar/example_6.cgi_.png_.txt');
        // Add .php as an allowed extension without .txt. Since insecure uploads are
        // are not allowed, .php files will be rejected.
        $this->field
            ->setSetting('file_extensions', 'php')
            ->save();
        $response = $this->fileRequest($uri, $php_string, [
            'Content-Disposition' => 'filename="example_7.php"',
        ]);
        $this->assertResourceErrorResponse(422, "Unprocessable Entity: file validation failed.\nFor security reasons, your upload has been rejected.", $uri, $response);
        // Make sure that no file was saved.
        $this->assertFileDoesNotExist('public://foobar/example_7.php');
        $this->assertFileDoesNotExist('public://foobar/example_7.php.txt');
        // Now allow insecure uploads.
        \Drupal::configFactory()->getEditable('system.file')
            ->set('allow_insecure_uploads', TRUE)
            ->save();
        // Allow all file uploads. This is very insecure.
        $this->field
            ->setSetting('file_extensions', '')
            ->save();
        \Drupal::service('router.builder')->rebuild();
        $response = $this->fileRequest($uri, $php_string, [
            'Content-Disposition' => 'filename="example_7.php"',
        ]);
        $expected = $this->getExpectedDocument(7, 'example_7.php', TRUE);
        // Override the expected filesize.
        $expected['data']['attributes']['filesize'] = strlen($php_string);
        // The file mime should also now be PHP.
        $expected['data']['attributes']['filemime'] = 'application/x-httpd-php';
        $this->assertResponseData($expected, $response);
        $this->assertFileExists('public://foobar/example_7.php');
    }
    
    /**
     * Tests using the file upload POST route no configuration.
     */
    public function testFileUploadNoConfiguration() : void {
        $this->setUpAuthorization('POST');
        $this->config('jsonapi.settings')
            ->set('read_only', FALSE)
            ->save(TRUE);
        $uri = Url::fromUri('base:' . static::$postUri);
        $this->field
            ->setSetting('file_extensions', '')
            ->save();
        \Drupal::service('router.builder')->rebuild();
        $response = $this->fileRequest($uri, $this->testFileData, [
            'Content-Disposition' => 'filename="example.txt"',
        ]);
        $expected = $this->getExpectedDocument(1, 'example.txt', TRUE);
        $this->assertResponseData($expected, $response);
        $this->assertFileExists('public://foobar/example.txt');
        $this->field
            ->setSetting('file_directory', '')
            ->save();
        $response = $this->fileRequest($uri, $this->testFileData, [
            'Content-Disposition' => 'filename="example.txt"',
        ]);
        $expected = $this->getExpectedDocument(2, 'example.txt', TRUE);
        $expected['data']['attributes']['uri']['value'] = 'public://example.txt';
        $expected['data']['attributes']['uri']['url'] = base_path() . $this->siteDirectory . '/files/example.txt';
        $this->assertResponseData($expected, $response);
        $this->assertFileExists('public://example.txt');
    }
    
    /**
     * {@inheritdoc}
     */
    protected function getExpectedUnauthorizedAccessMessage($method) : string {
        switch ($method) {
            case 'GET':
                return "The current user is not allowed to view this relationship. The 'view test entity' permission is required.";
            case 'POST':
                return "The current user is not permitted to upload a file for this field. The following permissions are required: 'administer entity_test content' OR 'administer entity_test_with_bundle content' OR 'create entity_test entity_test_with_bundle entities'.";
            case 'PATCH':
                return "The current user is not permitted to upload a file for this field. The 'administer entity_test content' permission is required.";
        }
        return '';
    }
    
    /**
     * Returns the expected JSON:API document for the expected file entity.
     *
     * @param int $fid
     *   The file ID to load and create a JSON:API document for.
     * @param string $expected_filename
     *   The expected filename for the stored file.
     * @param bool $expected_as_filename
     *   Whether the expected filename should be the filename property too.
     * @param bool $expected_status
     *   The expected file status. Defaults to FALSE.
     *
     * @return array
     *   A JSON:API response document.
     */
    protected function getExpectedDocument($fid = 1, $expected_filename = 'example.txt', $expected_as_filename = FALSE, $expected_status = FALSE) : array {
        $author = User::load($this->account
            ->id());
        $file = File::load($fid);
        $this->assertInstanceOf(File::class, $file);
        $self_url = Url::fromUri('base:/jsonapi/file/file/' . $file->uuid())
            ->setAbsolute()
            ->toString(TRUE)
            ->getGeneratedUrl();
        return [
            'jsonapi' => [
                'meta' => [
                    'links' => [
                        'self' => [
                            'href' => 'http://jsonapi.org/format/1.0/',
                        ],
                    ],
                ],
                'version' => '1.0',
            ],
            'links' => [
                'self' => [
                    'href' => $self_url,
                ],
            ],
            'data' => [
                'id' => $file->uuid(),
                'type' => 'file--file',
                'links' => [
                    'self' => [
                        'href' => $self_url,
                    ],
                ],
                'attributes' => [
                    'created' => (new \DateTime())->setTimestamp($file->getCreatedTime())
                        ->setTimezone(new \DateTimeZone('UTC'))
                        ->format(\DateTime::RFC3339),
                    'changed' => (new \DateTime())->setTimestamp($file->getChangedTime())
                        ->setTimezone(new \DateTimeZone('UTC'))
                        ->format(\DateTime::RFC3339),
                    'filemime' => 'text/plain',
                    'filename' => $expected_as_filename ? $expected_filename : 'example.txt',
                    'filesize' => strlen($this->testFileData),
                    'langcode' => 'en',
                    'status' => $expected_status,
                    'uri' => [
                        'value' => 'public://foobar/' . $expected_filename,
                        'url' => base_path() . $this->siteDirectory . '/files/foobar/' . rawurlencode($expected_filename),
                    ],
                    'drupal_internal__fid' => (int) $file->id(),
                ],
                'relationships' => [
                    'uid' => [
                        'data' => [
                            'id' => $author->uuid(),
                            'meta' => [
                                'drupal_internal__target_id' => (int) $author->id(),
                            ],
                            'type' => 'user--user',
                        ],
                        'links' => [
                            'related' => [
                                'href' => $self_url . '/uid',
                            ],
                            'self' => [
                                'href' => $self_url . '/relationships/uid',
                            ],
                        ],
                    ],
                ],
            ],
        ];
    }
    
    /**
     * Performs a file upload request. Wraps the Guzzle HTTP client.
     *
     * @param \Drupal\Core\Url $url
     *   URL to request.
     * @param string $file_contents
     *   The file contents to send as the request body.
     * @param array $headers
     *   Additional headers to send with the request. Defaults will be added for
     *   Content-Type and Content-Disposition. In order to remove the defaults set
     *   the header value to FALSE.
     *
     * @return \Psr\Http\Message\ResponseInterface
     *   The received response.
     *
     * @see \GuzzleHttp\ClientInterface::request()
     */
    protected function fileRequest(Url $url, $file_contents, array $headers = []) {
        $request_options = [];
        $headers = $headers + [
            // Set the required (and only accepted) content type for the request.
'Content-Type' => 'application/octet-stream',
            // Set the required Content-Disposition header for the file name.
'Content-Disposition' => 'file; filename="example.txt"',
            // Set the required JSON:API Accept header.
'Accept' => 'application/vnd.api+json',
        ];
        $request_options[RequestOptions::HEADERS] = array_filter($headers, function ($value) {
            return $value !== FALSE;
        });
        $request_options[RequestOptions::BODY] = $file_contents;
        $request_options = NestedArray::mergeDeep($request_options, $this->getAuthenticationRequestOptions());
        return $this->request('POST', $url, $request_options);
    }
    
    /**
     * {@inheritdoc}
     */
    protected function setUpAuthorization($method) : void {
        switch ($method) {
            case 'GET':
                $this->grantPermissionsToTestedRole([
                    'view test entity',
                ]);
                break;
            case 'POST':
                $this->grantPermissionsToTestedRole([
                    'create entity_test entity_test_with_bundle entities',
                    'access content',
                ]);
                break;
            case 'PATCH':
                $this->grantPermissionsToTestedRole([
                    'administer entity_test content',
                    'access content',
                ]);
                break;
        }
    }
    
    /**
     * Asserts expected normalized data matches response data.
     *
     * @param array $expected
     *   The expected data.
     * @param \Psr\Http\Message\ResponseInterface $response
     *   The file upload response.
     *
     * @internal
     */
    protected function assertResponseData(array $expected, ResponseInterface $response) : void {
        static::recursiveKSort($expected);
        $actual = $this->getDocumentFromResponse($response);
        static::recursiveKSort($actual);
        $this->assertSame($expected, $actual);
    }
    
    /**
     * {@inheritdoc}
     */
    protected function getExpectedUnauthorizedAccessCacheability() {
        // There is cacheability metadata to check as file uploads only allows POST
        // requests, which will not return cacheable responses.
        return new CacheableMetadata();
    }

}