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