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<?php
namespace Illuminate\Routing;
use Illuminate\Support\Collection;
class SortedMiddleware extends Collection
{
/**
* Create a new Sorted Middleware container.
*
* @param array $priorityMap
* @param \Illuminate\Support\Collection|array $middlewares
* @return void
*/
public function __construct(array $priorityMap, $middlewares)
{
if ($middlewares instanceof Collection) {
$middlewares = $middlewares->all();
}
$this->items = $this->sortMiddleware($priorityMap, $middlewares);
}
/**
* Sort the middlewares by the given priority map.
*
* Each call to this method makes one discrete middleware movement if necessary.
*
* @param array $priorityMap
* @param array $middlewares
* @return array
*/
protected function sortMiddleware($priorityMap, $middlewares)
{
$lastIndex = 0;
foreach ($middlewares as $index => $middleware) {
if (! is_string($middleware)) {
continue;
}
$priorityIndex = $this->priorityMapIndex($priorityMap, $middleware);
if (! is_null($priorityIndex)) {
// This middleware is in the priority map. If we have encountered another middleware
// that was also in the priority map and was at a lower priority than the current
// middleware, we will move this middleware to be above the previous encounter.
if (isset($lastPriorityIndex) && $priorityIndex < $lastPriorityIndex) {
return $this->sortMiddleware(
$priorityMap, array_values($this->moveMiddleware($middlewares, $index, $lastIndex))
);
}
// This middleware is in the priority map; but, this is the first middleware we have
// encountered from the map thus far. We'll save its current index plus its index
// from the priority map so we can compare against them on the next iterations.
$lastIndex = $index;
$lastPriorityIndex = $priorityIndex;
}
}
return Router::uniqueMiddleware($middlewares);
}
/**
* Calculate the priority map index of the middleware.
*
* @param array $priorityMap
* @param string $middleware
* @return int|null
*/
protected function priorityMapIndex($priorityMap, $middleware)
{
foreach ($this->middlewareNames($middleware) as $name) {
$priorityIndex = array_search($name, $priorityMap);
if ($priorityIndex !== false) {
return $priorityIndex;
}
}
}
/**
* Resolve the middleware names to look for in the priority array.
*
* @param string $middleware
* @return \Generator
*/
protected function middlewareNames($middleware)
{
$stripped = head(explode(':', $middleware));
yield $stripped;
$interfaces = @class_implements($stripped);
if ($interfaces !== false) {
foreach ($interfaces as $interface) {
yield $interface;
}
}
}
/**
* Splice a middleware into a new position and remove the old entry.
*
* @param array $middlewares
* @param int $from
* @param int $to
* @return array
*/
protected function moveMiddleware($middlewares, $from, $to)
{
array_splice($middlewares, $to, 0, $middlewares[$from]);
unset($middlewares[$from + 1]);
return $middlewares;
}
}