File size: 10.39Kb
<?php
/**
* Slim Framework (https://slimframework.com)
*
* @license https://github.com/slimphp/Slim/blob/4.x/LICENSE.md (MIT License)
*/
declare(strict_types=1);
namespace Slim\Handlers;
use Psr\Http\Message\ResponseFactoryInterface;
use Psr\Http\Message\ResponseInterface;
use Psr\Http\Message\ServerRequestInterface;
use Psr\Log\LoggerInterface;
use RuntimeException;
use Slim\Error\Renderers\HtmlErrorRenderer;
use Slim\Error\Renderers\JsonErrorRenderer;
use Slim\Error\Renderers\PlainTextErrorRenderer;
use Slim\Error\Renderers\XmlErrorRenderer;
use Slim\Exception\HttpException;
use Slim\Exception\HttpMethodNotAllowedException;
use Slim\Interfaces\CallableResolverInterface;
use Slim\Interfaces\ErrorHandlerInterface;
use Slim\Interfaces\ErrorRendererInterface;
use Slim\Logger;
use Throwable;
use function array_intersect;
use function array_key_exists;
use function array_keys;
use function call_user_func;
use function count;
use function current;
use function explode;
use function implode;
use function next;
use function preg_match;
/**
* Default Slim application error handler
*
* It outputs the error message and diagnostic information in one of the following formats:
* JSON, XML, Plain Text or HTML based on the Accept header.
*/
class ErrorHandler implements ErrorHandlerInterface
{
/**
* @var string
*/
protected $defaultErrorRendererContentType = 'text/html';
/**
* @var ErrorRendererInterface|string|callable
*/
protected $defaultErrorRenderer = HtmlErrorRenderer::class;
/**
* @var ErrorRendererInterface|string|callable
*/
protected $logErrorRenderer = PlainTextErrorRenderer::class;
/**
* @var array<string|callable>
*/
protected $errorRenderers = [
'application/json' => JsonErrorRenderer::class,
'application/xml' => XmlErrorRenderer::class,
'text/xml' => XmlErrorRenderer::class,
'text/html' => HtmlErrorRenderer::class,
'text/plain' => PlainTextErrorRenderer::class,
];
/**
* @var bool
*/
protected $displayErrorDetails;
/**
* @var bool
*/
protected $logErrors;
/**
* @var bool
*/
protected $logErrorDetails;
/**
* @var string|null
*/
protected $contentType;
/**
* @var string
*/
protected $method;
/**
* @var ServerRequestInterface
*/
protected $request;
/**
* @var Throwable
*/
protected $exception;
/**
* @var int
*/
protected $statusCode;
/**
* @var CallableResolverInterface
*/
protected $callableResolver;
/**
* @var ResponseFactoryInterface
*/
protected $responseFactory;
/**
* @var LoggerInterface
*/
protected $logger;
/**
* @param CallableResolverInterface $callableResolver
* @param ResponseFactoryInterface $responseFactory
* @param LoggerInterface|null $logger
*/
public function __construct(
CallableResolverInterface $callableResolver,
ResponseFactoryInterface $responseFactory,
?LoggerInterface $logger = null
) {
$this->callableResolver = $callableResolver;
$this->responseFactory = $responseFactory;
$this->logger = $logger ?: $this->getDefaultLogger();
}
/**
* Invoke error handler
*
* @param ServerRequestInterface $request The most recent Request object
* @param Throwable $exception The caught Exception object
* @param bool $displayErrorDetails Whether or not to display the error details
* @param bool $logErrors Whether or not to log errors
* @param bool $logErrorDetails Whether or not to log error details
*
* @return ResponseInterface
*/
public function __invoke(
ServerRequestInterface $request,
Throwable $exception,
bool $displayErrorDetails,
bool $logErrors,
bool $logErrorDetails
): ResponseInterface {
$this->displayErrorDetails = $displayErrorDetails;
$this->logErrors = $logErrors;
$this->logErrorDetails = $logErrorDetails;
$this->request = $request;
$this->exception = $exception;
$this->method = $request->getMethod();
$this->statusCode = $this->determineStatusCode();
if ($this->contentType === null) {
$this->contentType = $this->determineContentType($request);
}
if ($logErrors) {
$this->writeToErrorLog();
}
return $this->respond();
}
/**
* Force the content type for all error handler responses.
*
* @param string|null $contentType The content type
*/
public function forceContentType(?string $contentType): void
{
$this->contentType = $contentType;
}
/**
* @return int
*/
protected function determineStatusCode(): int
{
if ($this->method === 'OPTIONS') {
return 200;
}
if ($this->exception instanceof HttpException) {
return $this->exception->getCode();
}
return 500;
}
/**
* Determine which content type we know about is wanted using Accept header
*
* Note: This method is a bare-bones implementation designed specifically for
* Slim's error handling requirements. Consider a fully-feature solution such
* as willdurand/negotiation for any other situation.
*
* @param ServerRequestInterface $request
* @return string|null
*/
protected function determineContentType(ServerRequestInterface $request): ?string
{
$acceptHeader = $request->getHeaderLine('Accept');
$selectedContentTypes = array_intersect(
explode(',', $acceptHeader),
array_keys($this->errorRenderers)
);
$count = count($selectedContentTypes);
if ($count) {
$current = current($selectedContentTypes);
/**
* Ensure other supported content types take precedence over text/plain
* when multiple content types are provided via Accept header.
*/
if ($current === 'text/plain' && $count > 1) {
$next = next($selectedContentTypes);
if (is_string($next)) {
return $next;
}
}
if (is_string($current)) {
return $current;
}
}
if (preg_match('/\+(json|xml)/', $acceptHeader, $matches)) {
$mediaType = 'application/' . $matches[1];
if (array_key_exists($mediaType, $this->errorRenderers)) {
return $mediaType;
}
}
return null;
}
/**
* Determine which renderer to use based on content type
*
* @return callable
*
* @throws RuntimeException
*/
protected function determineRenderer(): callable
{
if ($this->contentType !== null && array_key_exists($this->contentType, $this->errorRenderers)) {
$renderer = $this->errorRenderers[$this->contentType];
} else {
$renderer = $this->defaultErrorRenderer;
}
return $this->callableResolver->resolve($renderer);
}
/**
* Register an error renderer for a specific content-type
*
* @param string $contentType The content-type this renderer should be registered to
* @param ErrorRendererInterface|string|callable $errorRenderer The error renderer
*/
public function registerErrorRenderer(string $contentType, $errorRenderer): void
{
$this->errorRenderers[$contentType] = $errorRenderer;
}
/**
* Set the default error renderer
*
* @param string $contentType The content type of the default error renderer
* @param ErrorRendererInterface|string|callable $errorRenderer The default error renderer
*/
public function setDefaultErrorRenderer(string $contentType, $errorRenderer): void
{
$this->defaultErrorRendererContentType = $contentType;
$this->defaultErrorRenderer = $errorRenderer;
}
/**
* Set the renderer for the error logger
*
* @param ErrorRendererInterface|string|callable $logErrorRenderer
*/
public function setLogErrorRenderer($logErrorRenderer): void
{
$this->logErrorRenderer = $logErrorRenderer;
}
/**
* Write to the error log if $logErrors has been set to true
*
* @return void
*/
protected function writeToErrorLog(): void
{
$renderer = $this->callableResolver->resolve($this->logErrorRenderer);
$error = $renderer($this->exception, $this->logErrorDetails);
if (!$this->displayErrorDetails) {
$error .= "\nTips: To display error details in HTTP response ";
$error .= 'set "displayErrorDetails" to true in the ErrorHandler constructor.';
}
$this->logError($error);
}
/**
* Wraps the error_log function so that this can be easily tested
*
* @param string $error
* @return void
*/
protected function logError(string $error): void
{
$this->logger->error($error);
}
/**
* Returns a default logger implementation.
*
* @return LoggerInterface
*/
protected function getDefaultLogger(): LoggerInterface
{
return new Logger();
}
/**
* @return ResponseInterface
*/
protected function respond(): ResponseInterface
{
$response = $this->responseFactory->createResponse($this->statusCode);
if ($this->contentType !== null && array_key_exists($this->contentType, $this->errorRenderers)) {
$response = $response->withHeader('Content-type', $this->contentType);
} else {
$response = $response->withHeader('Content-type', $this->defaultErrorRendererContentType);
}
if ($this->exception instanceof HttpMethodNotAllowedException) {
$allowedMethods = implode(', ', $this->exception->getAllowedMethods());
$response = $response->withHeader('Allow', $allowedMethods);
}
$renderer = $this->determineRenderer();
$body = call_user_func($renderer, $this->exception, $this->displayErrorDetails);
if ($body !== false) {
/** @var string $body */
$response->getBody()->write($body);
}
return $response;
}
}