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<?php
/**
* Whoops - php errors for cool kids
* @author Filipe Dobreira <http://github.com/filp>
*/
namespace Whoops;
use InvalidArgumentException;
use Throwable;
use Whoops\Exception\ErrorException;
use Whoops\Exception\Inspector;
use Whoops\Handler\CallbackHandler;
use Whoops\Handler\Handler;
use Whoops\Handler\HandlerInterface;
use Whoops\Util\Misc;
use Whoops\Util\SystemFacade;
final class Run implements RunInterface
{
/**
* @var bool
*/
private $isRegistered;
/**
* @var bool
*/
private $allowQuit = true;
/**
* @var bool
*/
private $sendOutput = true;
/**
* @var integer|false
*/
private $sendHttpCode = 500;
/**
* @var HandlerInterface[]
*/
private $handlerStack = [];
/**
* @var array
* @psalm-var list<array{patterns: string, levels: int}>
*/
private $silencedPatterns = [];
/**
* @var SystemFacade
*/
private $system;
/**
* In certain scenarios, like in shutdown handler, we can not throw exceptions.
*
* @var bool
*/
private $canThrowExceptions = true;
public function __construct(SystemFacade $system = null)
{
$this->system = $system ?: new SystemFacade;
}
/**
* Explicitly request your handler runs as the last of all currently registered handlers.
*
* @param HandlerInterface $handler
*
* @return Run
*/
public function appendHandler($handler)
{
array_unshift($this->handlerStack, $this->resolveHandler($handler));
return $this;
}
/**
* Explicitly request your handler runs as the first of all currently registered handlers.
*
* @param HandlerInterface $handler
*
* @return Run
*/
public function prependHandler($handler)
{
return $this->pushHandler($handler);
}
/**
* Register your handler as the last of all currently registered handlers (to be executed first).
* Prefer using appendHandler and prependHandler for clarity.
*
* @param Callable|HandlerInterface $handler
*
* @return Run
*
* @throws InvalidArgumentException If argument is not callable or instance of HandlerInterface.
*/
public function pushHandler($handler)
{
$this->handlerStack[] = $this->resolveHandler($handler);
return $this;
}
/**
* Removes and returns the last handler pushed to the handler stack.
*
* @see Run::removeFirstHandler(), Run::removeLastHandler()
*
* @return HandlerInterface|null
*/
public function popHandler()
{
return array_pop($this->handlerStack);
}
/**
* Removes the first handler.
*
* @return void
*/
public function removeFirstHandler()
{
array_pop($this->handlerStack);
}
/**
* Removes the last handler.
*
* @return void
*/
public function removeLastHandler()
{
array_shift($this->handlerStack);
}
/**
* Returns an array with all handlers, in the order they were added to the stack.
*
* @return array
*/
public function getHandlers()
{
return $this->handlerStack;
}
/**
* Clears all handlers in the handlerStack, including the default PrettyPage handler.
*
* @return Run
*/
public function clearHandlers()
{
$this->handlerStack = [];
return $this;
}
/**
* Registers this instance as an error handler.
*
* @return Run
*/
public function register()
{
if (!$this->isRegistered) {
// Workaround PHP bug 42098
// https://bugs.php.net/bug.php?id=42098
class_exists("\\Whoops\\Exception\\ErrorException");
class_exists("\\Whoops\\Exception\\FrameCollection");
class_exists("\\Whoops\\Exception\\Frame");
class_exists("\\Whoops\\Exception\\Inspector");
$this->system->setErrorHandler([$this, self::ERROR_HANDLER]);
$this->system->setExceptionHandler([$this, self::EXCEPTION_HANDLER]);
$this->system->registerShutdownFunction([$this, self::SHUTDOWN_HANDLER]);
$this->isRegistered = true;
}
return $this;
}
/**
* Unregisters all handlers registered by this Whoops\Run instance.
*
* @return Run
*/
public function unregister()
{
if ($this->isRegistered) {
$this->system->restoreExceptionHandler();
$this->system->restoreErrorHandler();
$this->isRegistered = false;
}
return $this;
}
/**
* Should Whoops allow Handlers to force the script to quit?
*
* @param bool|int $exit
*
* @return bool
*/
public function allowQuit($exit = null)
{
if (func_num_args() == 0) {
return $this->allowQuit;
}
return $this->allowQuit = (bool) $exit;
}
/**
* Silence particular errors in particular files.
*
* @param array|string $patterns List or a single regex pattern to match.
* @param int $levels Defaults to E_STRICT | E_DEPRECATED.
*
* @return Run
*/
public function silenceErrorsInPaths($patterns, $levels = 10240)
{
$this->silencedPatterns = array_merge(
$this->silencedPatterns,
array_map(
function ($pattern) use ($levels) {
return [
"pattern" => $pattern,
"levels" => $levels,
];
},
(array) $patterns
)
);
return $this;
}
/**
* Returns an array with silent errors in path configuration.
*
* @return array
*/
public function getSilenceErrorsInPaths()
{
return $this->silencedPatterns;
}
/**
* Should Whoops send HTTP error code to the browser if possible?
* Whoops will by default send HTTP code 500, but you may wish to
* use 502, 503, or another 5xx family code.
*
* @param bool|int $code
*
* @return int|false
*
* @throws InvalidArgumentException
*/
public function sendHttpCode($code = null)
{
if (func_num_args() == 0) {
return $this->sendHttpCode;
}
if (!$code) {
return $this->sendHttpCode = false;
}
if ($code === true) {
$code = 500;
}
if ($code < 400 || 600 <= $code) {
throw new InvalidArgumentException(
"Invalid status code '$code', must be 4xx or 5xx"
);
}
return $this->sendHttpCode = $code;
}
/**
* Should Whoops push output directly to the client?
* If this is false, output will be returned by handleException.
*
* @param bool|int $send
*
* @return bool
*/
public function writeToOutput($send = null)
{
if (func_num_args() == 0) {
return $this->sendOutput;
}
return $this->sendOutput = (bool) $send;
}
/**
* Handles an exception, ultimately generating a Whoops error page.
*
* @param Throwable $exception
*
* @return string Output generated by handlers.
*/
public function handleException($exception)
{
// Walk the registered handlers in the reverse order
// they were registered, and pass off the exception
$inspector = $this->getInspector($exception);
// Capture output produced while handling the exception,
// we might want to send it straight away to the client,
// or return it silently.
$this->system->startOutputBuffering();
// Just in case there are no handlers:
$handlerResponse = null;
$handlerContentType = null;
try {
foreach (array_reverse($this->handlerStack) as $handler) {
$handler->setRun($this);
$handler->setInspector($inspector);
$handler->setException($exception);
// The HandlerInterface does not require an Exception passed to handle()
// and neither of our bundled handlers use it.
// However, 3rd party handlers may have already relied on this parameter,
// and removing it would be possibly breaking for users.
$handlerResponse = $handler->handle($exception);
// Collect the content type for possible sending in the headers.
$handlerContentType = method_exists($handler, 'contentType') ? $handler->contentType() : null;
if (in_array($handlerResponse, [Handler::LAST_HANDLER, Handler::QUIT])) {
// The Handler has handled the exception in some way, and
// wishes to quit execution (Handler::QUIT), or skip any
// other handlers (Handler::LAST_HANDLER). If $this->allowQuit
// is false, Handler::QUIT behaves like Handler::LAST_HANDLER
break;
}
}
$willQuit = $handlerResponse == Handler::QUIT && $this->allowQuit();
} finally {
$output = $this->system->cleanOutputBuffer();
}
// If we're allowed to, send output generated by handlers directly
// to the output, otherwise, and if the script doesn't quit, return
// it so that it may be used by the caller
if ($this->writeToOutput()) {
// @todo Might be able to clean this up a bit better
if ($willQuit) {
// Cleanup all other output buffers before sending our output:
while ($this->system->getOutputBufferLevel() > 0) {
$this->system->endOutputBuffering();
}
// Send any headers if needed:
if (Misc::canSendHeaders() && $handlerContentType) {
header("Content-Type: {$handlerContentType}");
}
}
$this->writeToOutputNow($output);
}
if ($willQuit) {
// HHVM fix for https://github.com/facebook/hhvm/issues/4055
$this->system->flushOutputBuffer();
$this->system->stopExecution(1);
}
return $output;
}
/**
* Converts generic PHP errors to \ErrorException instances, before passing them off to be handled.
*
* This method MUST be compatible with set_error_handler.
*
* @param int $level
* @param string $message
* @param string|null $file
* @param int|null $line
*
* @return bool
*
* @throws ErrorException
*/
public function handleError($level, $message, $file = null, $line = null)
{
if ($level & $this->system->getErrorReportingLevel()) {
foreach ($this->silencedPatterns as $entry) {
$pathMatches = (bool) preg_match($entry["pattern"], $file);
$levelMatches = $level & $entry["levels"];
if ($pathMatches && $levelMatches) {
// Ignore the error, abort handling
// See https://github.com/filp/whoops/issues/418
return true;
}
}
// XXX we pass $level for the "code" param only for BC reasons.
// see https://github.com/filp/whoops/issues/267
$exception = new ErrorException($message, /*code*/ $level, /*severity*/ $level, $file, $line);
if ($this->canThrowExceptions) {
throw $exception;
} else {
$this->handleException($exception);
}
// Do not propagate errors which were already handled by Whoops.
return true;
}
// Propagate error to the next handler, allows error_get_last() to
// work on silenced errors.
return false;
}
/**
* Special case to deal with Fatal errors and the like.
*
* @return void
*/
public function handleShutdown()
{
// If we reached this step, we are in shutdown handler.
// An exception thrown in a shutdown handler will not be propagated
// to the exception handler. Pass that information along.
$this->canThrowExceptions = false;
$error = $this->system->getLastError();
if ($error && Misc::isLevelFatal($error['type'])) {
// If there was a fatal error,
// it was not handled in handleError yet.
$this->allowQuit = false;
$this->handleError(
$error['type'],
$error['message'],
$error['file'],
$error['line']
);
}
}
/**
* @param Throwable $exception
*
* @return Inspector
*/
private function getInspector($exception)
{
return new Inspector($exception);
}
/**
* Resolves the giving handler.
*
* @param HandlerInterface $handler
*
* @return HandlerInterface
*
* @throws InvalidArgumentException
*/
private function resolveHandler($handler)
{
if (is_callable($handler)) {
$handler = new CallbackHandler($handler);
}
if (!$handler instanceof HandlerInterface) {
throw new InvalidArgumentException(
"Handler must be a callable, or instance of "
. "Whoops\\Handler\\HandlerInterface"
);
}
return $handler;
}
/**
* Echo something to the browser.
*
* @param string $output
*
* @return Run
*/
private function writeToOutputNow($output)
{
if ($this->sendHttpCode() && Misc::canSendHeaders()) {
$this->system->setHttpResponseCode(
$this->sendHttpCode()
);
}
echo $output;
return $this;
}
}