FEATURE #1373: add history of content

This commit contains only core funcionality of displaying history. Module settings must be implemented in each module.

app/Handlers/Contracts/AppHandler.php

@@ -0,0 +1,30 @@
+<?php
+namespace App\Handlers\Contracts;
+
+use App\Models\Content;
+use App\Models\User;
+
+interface AppHandler
+{
+    /**
+     * Render given module into visitor area.
+     *
+     * @param Content $content    DB model from table contents
+     * @param array   $parameters parameters used for modifications/custom settings of given model
+     *
+     * @return mixed
+     */
+    public function render(Content $content, $parameters);
+
+    public static function getHistoryHandler();
+
+    /**
+     * Register admin menu (or multiple ones)
+     *
+     * This cannot be in ServiceProvider because Session is started at middleware. And ServiceProvider is called before
+     * starting any middleware..
+     *
+     * @param User $user model of logged user
+     */
+    public static function registerAdminMenu(User $user);
+}

app/Handlers/Contracts/HistoryHandler.php

@@ -0,0 +1,9 @@
+<?php
+namespace App\Handlers\Contracts;
+
+interface HistoryHandler
+{
+    public static function parseColumnName($name);
+
+    public static function parseChangedValue($changeset);
+}

app/Handlers/Handler.php

@@ -1,28 +1,23 @@
 <?php
 namespace App\Handlers;
 
-use App\Models\Content;
+use App\Handlers\Contracts\AppHandler;
 use App\Models\User;
-use Illuminate\Support\Facades\Auth;
 
 /**
  * Class Handler
  *
- * Handler is a class which handles module-specific behaviour which cannot be done by module itself, resp. cannot be done by some abstract magic.
+ * Handler is a class which handles module-specific behaviour which cannot be done by module itself, resp. cannot be
+ * done by some abstract magic.
  *
  * @package App\Handlers
  */
-abstract class Handler
+abstract class Handler implements AppHandler
 {
-    /**
-     * Render given module into visitor area.
-     *
-     * @param Content $content    DB model from table contents
-     * @param array   $parameters parameters used for modifications/custom settings of given model
-     *
-     * @return mixed
-     */
-    abstract public function render(Content $content, $parameters);
+    public static function getHistoryHandler()
+    {
+        return History::class;
+    }
 
     /**
      * Register admin menu (or multiple ones)
@@ -34,6 +29,6 @@ abstract class Handler
      */
     public static function registerAdminMenu(User $user)
     {
-        //
+        // core menu is registered in AdminMenuServiceProvider
     }
 }

app/Handlers/History.php

@@ -0,0 +1,45 @@
+<?php
+namespace App\Handlers;
+
+use App\Enumerations\ContentStatuses;
+use App\Handlers\Contracts\HistoryHandler;
+use App\Helpers\Differ;
+
+class History implements HistoryHandler
+{
+    public static function parseColumnName($column)
+    {
+        return trans('admin/history.column' . ucfirst($column));
+    }
+
+    public static function parseChangedValue($changeset)
+    {
+        switch ($changeset->column) {
+            case 'pageContent':
+                $route = route('history.diff', [
+                    'revision' => $changeset->edit_batch,
+                    'id'       => $changeset->id
+                ]);
+
+                return "(<a href='" . $route . "'>" . trans('admin/history.diff') . "</a>)";
+                break;
+            case 'metaDescription':
+                return Differ::htmlDiff($changeset->old_value, $changeset->new_value);
+                break;
+            case 'status':
+                $statuses = ContentStatuses::getWithTranslations();
+
+                return trans('admin/history.changedFromTo', [
+                    'from' => $statuses[$changeset->old_value],
+                    'to'   => $statuses[$changeset->new_value]
+                ]);
+                break;
+            default:
+                return trans('admin/history.changedFromTo', [
+                    'from' => $changeset->old_value,
+                    'to'   => $changeset->new_value
+                ]);
+                break;
+        }
+    }
+}