Added pre-install dependency check

Author: JulianPrieber

index.php

@@ -3,53 +3,66 @@
 use Illuminate\Contracts\Http\Kernel;
 use Illuminate\Http\Request;
 
-define('LARAVEL_START', microtime(true));
+$installing_file_exists = file_exists(__DIR__ . '/INSTALLING');
 
-/*
-|--------------------------------------------------------------------------
-| Check If Application Is Under Maintenance
-|--------------------------------------------------------------------------
-|
-| If the application is maintenance / demo mode via the "down" command we
-| will require this file so that any prerendered template can be shown
-| instead of starting the framework, which could cause an exception.
-|
-*/
+if ($installing_file_exists) {
+    $required_extensions = array('bcmath', 'ctype', 'curl', 'dom', 'fileinfo', 'json', 'mbstring', 'openssl', 'pcre', 'pdo', 'tokenizer', 'xml');
 
-if (file_exists(__DIR__.'/storage/framework/maintenance.php')) {
-    require __DIR__.'/storage/framework/maintenance.php';
+    foreach ($required_extensions as $ext) {
+        if (!extension_loaded($ext)) {
+            throw new Exception('PHP extension ' . $ext . ' is not installed on your system');
+        }
+    }
 }
-
-/*
-|--------------------------------------------------------------------------
-| Register The Auto Loader
-|--------------------------------------------------------------------------
-|
-| Composer provides a convenient, automatically generated class loader for
-| this application. We just need to utilize it! We'll simply require it
-| into the script here so we don't need to manually load our classes.
-|
-*/
-
-require __DIR__.'/vendor/autoload.php';
-
-/*
-|--------------------------------------------------------------------------
-| Run The Application
-|--------------------------------------------------------------------------
-|
-| Once we have the application, we can handle the incoming request using
-| the application's HTTP kernel. Then, we will send the response back
-| to this client's browser, allowing them to enjoy our application.
-|
-*/
-
-$app = require_once __DIR__.'/bootstrap/app.php';
-
-$kernel = $app->make(Kernel::class);
-
-$response = tap($kernel->handle(
-    $request = Request::capture()
-))->send();
-
-$kernel->terminate($request, $response);
+    
+    define('LARAVEL_START', microtime(true));
+    
+    /*
+    |--------------------------------------------------------------------------
+    | Check If Application Is Under Maintenance
+    |--------------------------------------------------------------------------
+    |
+    | If the application is maintenance / demo mode via the "down" command we
+    | will require this file so that any prerendered template can be shown
+    | instead of starting the framework, which could cause an exception.
+    |
+    */
+    
+    if (file_exists(__DIR__.'/storage/framework/maintenance.php')) {
+        require __DIR__.'/storage/framework/maintenance.php';
+    }
+    
+    /*
+    |--------------------------------------------------------------------------
+    | Register The Auto Loader
+    |--------------------------------------------------------------------------
+    |
+    | Composer provides a convenient, automatically generated class loader for
+    | this application. We just need to utilize it! We'll simply require it
+    | into the script here so we don't need to manually load our classes.
+    |
+    */
+    
+    require __DIR__.'/vendor/autoload.php';
+    
+    /*
+    |--------------------------------------------------------------------------
+    | Run The Application
+    |--------------------------------------------------------------------------
+    |
+    | Once we have the application, we can handle the incoming request using
+    | the application's HTTP kernel. Then, we will send the response back
+    | to this client's browser, allowing them to enjoy our application.
+    |
+    */
+    
+    $app = require_once __DIR__.'/bootstrap/app.php';
+    
+    $kernel = $app->make(Kernel::class);
+    
+    $response = tap($kernel->handle(
+        $request = Request::capture()
+    ))->send();
+    
+    $kernel->terminate($request, $response);
+