Rough extension management implementation

src/Support/Extension.php

@@ -4,4 +4,11 @@ use Flarum\Support\ServiceProvider;
 
 class Extension extends ServiceProvider
 {
+    public function install()
+    {
+    }
+
+    public function uninstall()
+    {
+    }
 }

src/Support/ExtensionManager.php

@@ -0,0 +1,104 @@
+<?php namespace Flarum\Support;
+
+use Flarum\Support\ServiceProvider;
+use Flarum\Core\Settings\SettingsRepository;
+use Illuminate\Contracts\Container\Container;
+
+class ExtensionManager
+{
+    protected $config;
+
+    protected $app;
+
+    public function __construct(SettingsRepository $config, Container $app)
+    {
+        $this->config = $config;
+        $this->app = $app;
+    }
+
+    public function getInfo()
+    {
+        $extensionsDir = $this->getExtensionsDir();
+
+        $dirs = array_diff(scandir($extensionsDir), ['.', '..']);
+        $extensions = [];
+
+        foreach ($dirs as $dir) {
+            if (file_exists($manifest = $extensionsDir . '/' . $dir . '/flarum.json')) {
+                $extensions[] = json_decode(file_get_contents($manifest));
+            }
+        }
+
+        return $extensions;
+    }
+
+    public function enable($extension)
+    {
+        $enabled = $this->getEnabled();
+
+        if (! in_array($extension, $enabled)) {
+            $enabled[] = $extension;
+
+            $class = $this->load($extension);
+
+            $class->install();
+
+            // run migrations
+            // vendor publish
+
+            $this->setEnabled($enabled);
+        }
+    }
+
+    public function disable($extension)
+    {
+        $enabled = $this->getEnabled();
+
+        if (($k = array_search($extension, $enabled)) !== false) {
+            unset($enabled[$k]);
+
+            $this->setEnabled($enabled);
+        }
+    }
+
+    public function uninstall($extension)
+    {
+        $this->disable($extension);
+
+        $class = $this->load($extension);
+
+        $class->uninstall();
+
+        // run migrations
+    }
+
+    protected function getEnabled()
+    {
+        $config = $this->config->get('extensions_enabled');
+
+        return json_decode($config, true);
+    }
+
+    protected function setEnabled(array $enabled)
+    {
+        $enabled = array_values(array_unique($enabled));
+
+        $this->config->set('extensions_enabled', json_encode($enabled));
+    }
+
+    protected function load($extension)
+    {
+        if (file_exists($file = $this->getExtensionsDir() . '/' . $extension . '/bootstrap.php')) {
+            $className = require $file;
+
+            $class = new $className($this->app);
+        }
+
+        return $class;
+    }
+
+    protected function getExtensionsDir()
+    {
+        return public_path('extensions');
+    }
+}

src/Support/ExtensionsServiceProvider.php

@@ -9,6 +9,8 @@ class ExtensionsServiceProvider extends ServiceProvider
      */
     public function register()
     {
+        $this->app->bind('flarum.extensions', 'Flarum\Support\ExtensionManager');
+
         $config = $this->app->make('Flarum\Core\Settings\SettingsRepository')->get('extensions_enabled');
         $extensions = json_decode($config, true);
         $providers = [];