Installing and managing modules from admin panel (#847)

app/Services/Installer/RequirementsService.php

@@ -0,0 +1,77 @@
+<?php
+
+namespace App\Services\Installer;
+
+use App\Contracts\Service;
+
+class RequirementsService extends Service
+{
+    /**
+     * Check the PHP version that it meets the minimum requirement
+     *
+     * @return array
+     */
+    public function checkPHPVersion(): array
+    {
+        $passed = false;
+        if (version_compare(PHP_VERSION, config('installer.php.version')) >= 0) {
+            $passed = true;
+        }
+
+        return ['version' => PHP_VERSION, 'passed' => $passed];
+    }
+
+    /**
+     * Make sure the minimal extensions required are loaded
+     *
+     * @return array
+     */
+    public function checkExtensions(): array
+    {
+        $extensions = [];
+        foreach (config('installer.extensions') as $ext) {
+            $pass = true;
+            if (!\extension_loaded($ext)) {
+                $pass = false;
+            }
+
+            $extensions[] = [
+                'ext'    => $ext,
+                'passed' => $pass,
+            ];
+        }
+
+        return $extensions;
+    }
+
+    /**
+     * Check the permissions for the directories specified
+     * Make sure they exist and are writable
+     *
+     * @return array
+     */
+    public function checkPermissions(): array
+    {
+        clearstatcache();
+
+        $directories = [];
+        foreach (config('installer.permissions') as $path) {
+            $pass = true;
+
+            if (!file_exists($path)) {
+                $pass = false;
+            }
+
+            if (!is_writable($path)) {
+                $pass = false;
+            }
+
+            $directories[] = [
+                'dir'    => $path,
+                'passed' => $pass,
+            ];
+        }
+
+        return $directories;
+    }
+}