http2/router.php

   1 <?php
   2 // Hoplite
   3 // Copyright (c) 2016 Blue Static
   4 //
   5 // This program is free software: you can redistribute it and/or modify it
   6 // under the terms of the GNU General Public License as published by the Free
   7 // Software Foundation, either version 3 of the License, or any later version.
   8 //
   9 // This program is distributed in the hope that it will be useful, but WITHOUT
  10 // ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11 // FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  12 // more details.
  13 //
  14 // You should have received a copy of the GNU General Public License along with
  15 // this program.  If not, see <http://www.gnu.org/licenses/>.
  16
  17 namespace hoplite\http2;
  18
  19 require_once HOPLITE_ROOT . '/http2/middleware.php';
  20 require_once HOPLITE_ROOT . '/http2/pipeline.php';
  21 require_once HOPLITE_ROOT . '/http2/route_map.php';
  22
  23 /*!
  24   The Router is a middleware that operates on a RouteMap object. If a Request
  25   matches, the value in the RouteMap is treated as a Middleware to be built by
  26   Pipeline::buildMiddleware().
  27
  28   If the secondary Pipeline Router::subpipe is provided, the matched value will
  29   be treated as if it were Pipeline::add()ed immediately before being built.
  30   This allows additional middleware to execute IFF a route match occurs.
  31
  32   If no route mach is made, then the Router runs the next middleware.
  33 */
  34 class Router extends Middleware {
  35   private $map;
  36   private $subpipe;
  37
  38   public function __construct(Pipeline $pipeline,
  39                               Middleware $next,
  40                               RouteMap $map,
  41                               Pipeline $subpipe=NULL) {
  42     parent::__construct($pipeline, $next);
  43     $this->map = $map;
  44     $this->subpipe = $subpipe ? $subpipe : new Pipeline();
  45   }
  46
  47   public function execute(Request $request) {
  48     // The query rewriter module of the webserver rewrites a request from:
  49     //    http://example.com/webapp/user/view/42
  50     // to:
  51     //    http://example.com/webapp/index.php/user/view/42
  52     // ... which then becomes accessible from PATH_INFO.
  53     if (isset($_SERVER['PATH_INFO']))
  54       $url = $_SERVER['PATH_INFO'];
  55     else
  56       $url = '/';
  57     if ($url[0] == '/')
  58       $url = substr($url, 1);
  59
  60     $request->url = $url;
  61     $route_result = $this->map->match($request);
  62
  63     if ($route_result) {
  64       $request->context[self::class] = $route_result;
  65       $next = $this->subpipe->buildWithTail($route_result['result']);
  66       return $next->execute($request);
  67     }
  68
  69     return $this->next->execute($request);
  70   }
  71 }