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355
system/API/ResponseTrait.php
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355
system/API/ResponseTrait.php
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<?php
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/**
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* This file is part of CodeIgniter 4 framework.
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*
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* (c) CodeIgniter Foundation <admin@codeigniter.com>
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*
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* For the full copyright and license information, please view
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* the LICENSE file that was distributed with this source code.
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*/
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namespace CodeIgniter\API;
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use CodeIgniter\Format\FormatterInterface;
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use CodeIgniter\HTTP\IncomingRequest;
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use CodeIgniter\HTTP\Response;
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use Config\Services;
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/**
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* Provides common, more readable, methods to provide
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* consistent HTTP responses under a variety of common
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* situations when working as an API.
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*
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* @property IncomingRequest $request
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* @property Response $response
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*/
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trait ResponseTrait
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{
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/**
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* Allows child classes to override the
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* status code that is used in their API.
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*
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* @var array<string, int>
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*/
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protected $codes = [
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'created' => 201,
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'deleted' => 200,
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'updated' => 200,
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'no_content' => 204,
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'invalid_request' => 400,
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'unsupported_response_type' => 400,
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'invalid_scope' => 400,
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'temporarily_unavailable' => 400,
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'invalid_grant' => 400,
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'invalid_credentials' => 400,
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'invalid_refresh' => 400,
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'no_data' => 400,
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'invalid_data' => 400,
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'access_denied' => 401,
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'unauthorized' => 401,
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'invalid_client' => 401,
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'forbidden' => 403,
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'resource_not_found' => 404,
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'not_acceptable' => 406,
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'resource_exists' => 409,
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'conflict' => 409,
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'resource_gone' => 410,
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'payload_too_large' => 413,
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'unsupported_media_type' => 415,
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'too_many_requests' => 429,
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'server_error' => 500,
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'unsupported_grant_type' => 501,
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'not_implemented' => 501,
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];
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/**
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* How to format the response data.
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* Either 'json' or 'xml'. If blank will be
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* determine through content negotiation.
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*
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* @var string
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*/
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protected $format = 'json';
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/**
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* Current Formatter instance. This is usually set by ResponseTrait::format
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*
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* @var FormatterInterface
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*/
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protected $formatter;
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/**
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* Provides a single, simple method to return an API response, formatted
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* to match the requested format, with proper content-type and status code.
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*
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* @param array|string|null $data
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*
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* @return Response
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*/
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protected function respond($data = null, ?int $status = null, string $message = '')
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{
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if ($data === null && $status === null) {
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$status = 404;
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$output = null;
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} elseif ($data === null && is_numeric($status)) {
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$output = null;
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} else {
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$status = empty($status) ? 200 : $status;
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$output = $this->format($data);
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}
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if ($output !== null) {
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if ($this->format === 'json') {
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return $this->response->setJSON($output)->setStatusCode($status, $message);
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}
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if ($this->format === 'xml') {
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return $this->response->setXML($output)->setStatusCode($status, $message);
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}
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}
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return $this->response->setBody($output)->setStatusCode($status, $message);
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}
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/**
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* Used for generic failures that no custom methods exist for.
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*
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* @param array|string $messages
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* @param int $status HTTP status code
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* @param string|null $code Custom, API-specific, error code
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*
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* @return Response
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*/
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protected function fail($messages, int $status = 400, ?string $code = null, string $customMessage = '')
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{
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if (! is_array($messages)) {
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$messages = ['error' => $messages];
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}
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$response = [
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'status' => $status,
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'error' => $code ?? $status,
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'messages' => $messages,
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];
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return $this->respond($response, $status, $customMessage);
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}
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//--------------------------------------------------------------------
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// Response Helpers
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//--------------------------------------------------------------------
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/**
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* Used after successfully creating a new resource.
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*
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* @param mixed $data
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*
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* @return Response
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*/
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protected function respondCreated($data = null, string $message = '')
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{
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return $this->respond($data, $this->codes['created'], $message);
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}
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/**
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* Used after a resource has been successfully deleted.
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*
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* @param mixed $data
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*
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* @return Response
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*/
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protected function respondDeleted($data = null, string $message = '')
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{
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return $this->respond($data, $this->codes['deleted'], $message);
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}
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/**
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* Used after a resource has been successfully updated.
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*
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* @param mixed $data
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*
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* @return Response
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*/
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protected function respondUpdated($data = null, string $message = '')
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{
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return $this->respond($data, $this->codes['updated'], $message);
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}
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/**
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* Used after a command has been successfully executed but there is no
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* meaningful reply to send back to the client.
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*
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* @return Response
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*/
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protected function respondNoContent(string $message = 'No Content')
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{
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return $this->respond(null, $this->codes['no_content'], $message);
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}
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/**
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* Used when the client is either didn't send authorization information,
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* or had bad authorization credentials. User is encouraged to try again
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* with the proper information.
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*
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* @return Response
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*/
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protected function failUnauthorized(string $description = 'Unauthorized', ?string $code = null, string $message = '')
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{
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return $this->fail($description, $this->codes['unauthorized'], $code, $message);
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}
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/**
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* Used when access is always denied to this resource and no amount
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* of trying again will help.
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*
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* @return Response
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*/
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protected function failForbidden(string $description = 'Forbidden', ?string $code = null, string $message = '')
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{
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return $this->fail($description, $this->codes['forbidden'], $code, $message);
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}
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/**
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* Used when a specified resource cannot be found.
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*
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* @return Response
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*/
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protected function failNotFound(string $description = 'Not Found', ?string $code = null, string $message = '')
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{
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return $this->fail($description, $this->codes['resource_not_found'], $code, $message);
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}
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/**
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* Used when the data provided by the client cannot be validated.
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*
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* @return Response
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*
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* @deprecated Use failValidationErrors instead
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*/
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protected function failValidationError(string $description = 'Bad Request', ?string $code = null, string $message = '')
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{
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return $this->fail($description, $this->codes['invalid_data'], $code, $message);
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}
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/**
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* Used when the data provided by the client cannot be validated on one or more fields.
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*
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* @param string|string[] $errors
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*
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* @return Response
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*/
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protected function failValidationErrors($errors, ?string $code = null, string $message = '')
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{
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return $this->fail($errors, $this->codes['invalid_data'], $code, $message);
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}
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/**
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* Use when trying to create a new resource and it already exists.
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*
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* @return Response
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*/
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protected function failResourceExists(string $description = 'Conflict', ?string $code = null, string $message = '')
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{
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return $this->fail($description, $this->codes['resource_exists'], $code, $message);
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}
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/**
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* Use when a resource was previously deleted. This is different than
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* Not Found, because here we know the data previously existed, but is now gone,
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* where Not Found means we simply cannot find any information about it.
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*
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* @return Response
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*/
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protected function failResourceGone(string $description = 'Gone', ?string $code = null, string $message = '')
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{
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return $this->fail($description, $this->codes['resource_gone'], $code, $message);
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}
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/**
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* Used when the user has made too many requests for the resource recently.
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*
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* @return Response
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*/
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protected function failTooManyRequests(string $description = 'Too Many Requests', ?string $code = null, string $message = '')
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{
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return $this->fail($description, $this->codes['too_many_requests'], $code, $message);
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}
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/**
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* Used when there is a server error.
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*
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* @param string $description The error message to show the user.
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* @param string|null $code A custom, API-specific, error code.
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* @param string $message A custom "reason" message to return.
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*
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* @return Response The value of the Response's send() method.
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*/
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protected function failServerError(string $description = 'Internal Server Error', ?string $code = null, string $message = ''): Response
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{
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return $this->fail($description, $this->codes['server_error'], $code, $message);
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}
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//--------------------------------------------------------------------
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// Utility Methods
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//--------------------------------------------------------------------
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/**
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* Handles formatting a response. Currently makes some heavy assumptions
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* and needs updating! :)
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*
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* @param array|string|null $data
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*
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* @return string|null
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*/
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protected function format($data = null)
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{
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// If the data is a string, there's not much we can do to it...
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if (is_string($data)) {
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// The content type should be text/... and not application/...
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$contentType = $this->response->getHeaderLine('Content-Type');
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$contentType = str_replace('application/json', 'text/html', $contentType);
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$contentType = str_replace('application/', 'text/', $contentType);
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$this->response->setContentType($contentType);
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$this->format = 'html';
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return $data;
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}
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$format = Services::format();
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$mime = "application/{$this->format}";
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// Determine correct response type through content negotiation if not explicitly declared
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if (empty($this->format) || ! in_array($this->format, ['json', 'xml'], true)) {
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$mime = $this->request->negotiate('media', $format->getConfig()->supportedResponseFormats, false);
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}
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$this->response->setContentType($mime);
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// if we don't have a formatter, make one
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if (! isset($this->formatter)) {
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// if no formatter, use the default
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$this->formatter = $format->getFormatter($mime);
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}
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if ($mime !== 'application/json') {
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// Recursively convert objects into associative arrays
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// Conversion not required for JSONFormatter
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$data = json_decode(json_encode($data), true);
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}
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return $this->formatter->format($data);
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}
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/**
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* Sets the format the response should be in.
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*
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* @return $this
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*/
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protected function setResponseFormat(?string $format = null)
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{
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$this->format = strtolower($format);
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return $this;
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}
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}
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