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<?php
namespace Illuminate\Broadcasting\Broadcasters;
use Exception;
use Illuminate\Container\Container;
use Illuminate\Contracts\Broadcasting\Broadcaster as BroadcasterContract;
use Illuminate\Contracts\Routing\BindingRegistrar;
use Illuminate\Contracts\Routing\UrlRoutable;
use Illuminate\Support\Arr;
use Illuminate\Support\Reflector;
use Illuminate\Support\Str;
use ReflectionClass;
use ReflectionFunction;
use Symfony\Component\HttpKernel\Exception\AccessDeniedHttpException;
abstract class Broadcaster implements BroadcasterContract
{
/**
* The registered channel authenticators.
*
* @var array
*/
protected $channels = [];
/**
* The registered channel options.
*
* @var array
*/
protected $channelOptions = [];
/**
* The binding registrar instance.
*
* @var \Illuminate\Contracts\Routing\BindingRegistrar
*/
protected $bindingRegistrar;
/**
* Register a channel authenticator.
*
* @param string $channel
* @param callable|string $callback
* @param array $options
* @return $this
*/
public function channel($channel, $callback, $options = [])
{
$this->channels[$channel] = $callback;
$this->channelOptions[$channel] = $options;
return $this;
}
/**
* Authenticate the incoming request for a given channel.
*
* @param \Illuminate\Http\Request $request
* @param string $channel
* @return mixed
*
* @throws \Symfony\Component\HttpKernel\Exception\AccessDeniedHttpException
*/
protected function verifyUserCanAccessChannel($request, $channel)
{
foreach ($this->channels as $pattern => $callback) {
if (! $this->channelNameMatchesPattern($channel, $pattern)) {
continue;
}
$parameters = $this->extractAuthParameters($pattern, $channel, $callback);
$handler = $this->normalizeChannelHandlerToCallable($callback);
if ($result = $handler($this->retrieveUser($request, $channel), ...$parameters)) {
return $this->validAuthenticationResponse($request, $result);
}
}
throw new AccessDeniedHttpException;
}
/**
* Extract the parameters from the given pattern and channel.
*
* @param string $pattern
* @param string $channel
* @param callable|string $callback
* @return array
*/
protected function extractAuthParameters($pattern, $channel, $callback)
{
$callbackParameters = $this->extractParameters($callback);
return collect($this->extractChannelKeys($pattern, $channel))->reject(function ($value, $key) {
return is_numeric($key);
})->map(function ($value, $key) use ($callbackParameters) {
return $this->resolveBinding($key, $value, $callbackParameters);
})->values()->all();
}
/**
* Extracts the parameters out of what the user passed to handle the channel authentication.
*
* @param callable|string $callback
* @return \ReflectionParameter[]
*
* @throws \Exception
*/
protected function extractParameters($callback)
{
if (is_callable($callback)) {
return (new ReflectionFunction($callback))->getParameters();
} elseif (is_string($callback)) {
return $this->extractParametersFromClass($callback);
}
throw new Exception('Given channel handler is an unknown type.');
}
/**
* Extracts the parameters out of a class channel's "join" method.
*
* @param string $callback
* @return \ReflectionParameter[]
*
* @throws \Exception
*/
protected function extractParametersFromClass($callback)
{
$reflection = new ReflectionClass($callback);
if (! $reflection->hasMethod('join')) {
throw new Exception('Class based channel must define a "join" method.');
}
return $reflection->getMethod('join')->getParameters();
}
/**
* Extract the channel keys from the incoming channel name.
*
* @param string $pattern
* @param string $channel
* @return array
*/
protected function extractChannelKeys($pattern, $channel)
{
preg_match('/^'.preg_replace('/\{(.*?)\}/', '(?<$1>[^\.]+)', $pattern).'/', $channel, $keys);
return $keys;
}
/**
* Resolve the given parameter binding.
*
* @param string $key
* @param string $value
* @param array $callbackParameters
* @return mixed
*/
protected function resolveBinding($key, $value, $callbackParameters)
{
$newValue = $this->resolveExplicitBindingIfPossible($key, $value);
return $newValue === $value ? $this->resolveImplicitBindingIfPossible(
$key, $value, $callbackParameters
) : $newValue;
}
/**
* Resolve an explicit parameter binding if applicable.
*
* @param string $key
* @param mixed $value
* @return mixed
*/
protected function resolveExplicitBindingIfPossible($key, $value)
{
$binder = $this->binder();
if ($binder && $binder->getBindingCallback($key)) {
return call_user_func($binder->getBindingCallback($key), $value);
}
return $value;
}
/**
* Resolve an implicit parameter binding if applicable.
*
* @param string $key
* @param mixed $value
* @param array $callbackParameters
* @return mixed
*
* @throws \Symfony\Component\HttpKernel\Exception\AccessDeniedHttpException
*/
protected function resolveImplicitBindingIfPossible($key, $value, $callbackParameters)
{
foreach ($callbackParameters as $parameter) {
if (! $this->isImplicitlyBindable($key, $parameter)) {
continue;
}
$className = Reflector::getParameterClassName($parameter);
if (is_null($model = (new $className)->resolveRouteBinding($value))) {
throw new AccessDeniedHttpException;
}
return $model;
}
return $value;
}
/**
* Determine if a given key and parameter is implicitly bindable.
*
* @param string $key
* @param \ReflectionParameter $parameter
* @return bool
*/
protected function isImplicitlyBindable($key, $parameter)
{
return $parameter->getName() === $key &&
Reflector::isParameterSubclassOf($parameter, UrlRoutable::class);
}
/**
* Format the channel array into an array of strings.
*
* @param array $channels
* @return array
*/
protected function formatChannels(array $channels)
{
return array_map(function ($channel) {
return (string) $channel;
}, $channels);
}
/**
* Get the model binding registrar instance.
*
* @return \Illuminate\Contracts\Routing\BindingRegistrar
*/
protected function binder()
{
if (! $this->bindingRegistrar) {
$this->bindingRegistrar = Container::getInstance()->bound(BindingRegistrar::class)
? Container::getInstance()->make(BindingRegistrar::class) : null;
}
return $this->bindingRegistrar;
}
/**
* Normalize the given callback into a callable.
*
* @param mixed $callback
* @return callable
*/
protected function normalizeChannelHandlerToCallable($callback)
{
return is_callable($callback) ? $callback : function (...$args) use ($callback) {
return Container::getInstance()
->make($callback)
->join(...$args);
};
}
/**
* Retrieve the authenticated user using the configured guard (if any).
*
* @param \Illuminate\Http\Request $request
* @param string $channel
* @return mixed
*/
protected function retrieveUser($request, $channel)
{
$options = $this->retrieveChannelOptions($channel);
$guards = $options['guards'] ?? null;
if (is_null($guards)) {
return $request->user();
}
foreach (Arr::wrap($guards) as $guard) {
if ($user = $request->user($guard)) {
return $user;
}
}
}
/**
* Retrieve options for a certain channel.
*
* @param string $channel
* @return array
*/
protected function retrieveChannelOptions($channel)
{
foreach ($this->channelOptions as $pattern => $options) {
if (! $this->channelNameMatchesPattern($channel, $pattern)) {
continue;
}
return $options;
}
return [];
}
/**
* Check if the channel name from the request matches a pattern from registered channels.
*
* @param string $channel
* @param string $pattern
* @return bool
*/
protected function channelNameMatchesPattern($channel, $pattern)
{
return Str::is(preg_replace('/\{(.*?)\}/', '*', $pattern), $channel);
}
}
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