auto link items from an elixir /build/rev-manifest.json file

Author: Tom Schlick

config/server-push.php

@@ -6,15 +6,17 @@
     'default_links' => [
         'styles' => [
 
-            ],
+        ],
 
         'scripts' => [
 
-            ],
+        ],
 
         'images' => [
 
-            ],
+        ],
     ],
 
+    // Auto link all files that are built with elixir
+    'autolink_elixir' => true,
 ];

src/HttpPush.php

@@ -18,8 +18,12 @@ class HttpPush
      * @param string $resourcePath
      * @param string $type
      */
-    public function queueResource(string $resourcePath, string $type)
+    public function queueResource(string $resourcePath, string $type = null)
     {
+        if (!$type) {
+            $type = static::getTypeByExtension($resourcePath);
+        }
+
         $this->resources[] = [
             'path' => $resourcePath,
             'type' => $type,
@@ -36,7 +40,7 @@ public function generateLinks() : array
         $links = [];
 
         foreach ($this->resources as $row) {
-            $links[] = '<'.$row['path'].'>; rel=preload; as='.$row['type'];
+            $links[] = '<' . $row['path'] . '>; rel=preload; as=' . $row['type'];
         }
 
         return $links;
@@ -57,4 +61,27 @@ public function clear()
     {
         $this->resources = [];
     }
+
+    /**
+     * @param string $resourcePath
+     * @return string
+     */
+    public static function getTypeByExtension(string $resourcePath) : string
+    {
+        $parts = explode('.', $resourcePath);
+        $extension = end($parts);
+        switch ($extension) {
+            case 'css':
+                return 'style';
+                break;
+
+            case 'js':
+                return 'script';
+                break;
+
+            default:
+                return 'image';
+                break;
+        }
+    }
 }

src/ServiceProvider.php

@@ -15,7 +15,7 @@ class ServiceProvider extends BaseServiceProvider
     public function boot()
     {
         $this->publishes([
-            __DIR__.'/../config/server-push.php' => config_path('server-push.php'),
+            __DIR__ . '/../config/server-push.php' => config_path('server-push.php'),
         ], 'config');
     }
 
@@ -31,15 +31,15 @@ public function register()
         });
 
         $this->registerDefaultLinks();
+        $this->registerElixirLinks();
     }
 
     /**
      * Load the default links from the config.
      */
     protected function registerDefaultLinks()
     {
-        $this->mergeConfigFrom(__DIR__.'/../config/server-push.php', 'server-push');
-
+        $this->mergeConfigFrom(__DIR__ . '/../config/server-push.php', 'server-push');
         $instance = app('server-push');
 
         foreach (config('server-push.default_links', []) as $type => $paths) {
@@ -49,4 +49,20 @@ protected function registerDefaultLinks()
             }
         }
     }
+
+    protected function registerElixirLinks()
+    {
+        $this->mergeConfigFrom(__DIR__ . '/../config/server-push.php', 'server-push');
+        $instance = app('server-push');
+
+        if (config('server-push.autolink_elixir')) {
+            $revPath = public_path() . '/build/rev-manifest.json';
+            if (file_exists($revPath)) {
+                $revMap = json_decode($revPath, true);
+                foreach (array_values($revMap) as $path) {
+                    $instance->queueResource('/' . ltrim($path, '/'));
+                }
+            }
+        }
+    }
 }

tests/HttpPushTest.php

@@ -54,4 +54,14 @@ public function test_clear_resources()
         $this->instance->clear();
         $this->assertTrue(empty($this->instance->resources));
     }
+
+    public function test_get_type_by_extension()
+    {
+        $this->assertEquals('script', (HttpPush::getTypeByExtension('/build/app.js')));
+        $this->assertEquals('script', (HttpPush::getTypeByExtension('app.min.js')));
+
+        $this->assertEquals('style', (HttpPush::getTypeByExtension('/assets/main.css')));
+        $this->assertEquals('image', (HttpPush::getTypeByExtension('/assets/logo.png')));
+        $this->assertEquals('image', (HttpPush::getTypeByExtension('/assets/header.gif')));
+    }
 }