FEATURE #1373: add history of content

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

app/Http/Controllers/Admin/History.php

@@ -0,0 +1,49 @@
+<?php
+namespace App\Http\Controllers\Admin;
+
+use App\Models\Content;
+use App\Models\ContentHistory;
+
+class History extends Controller
+{
+    /**
+     * @var ContentHistory
+     */
+    private $history;
+
+    public function __construct(ContentHistory $history)
+    {
+        parent::__construct();
+        $this->history = $history;
+    }
+
+    /**
+     * @param $id
+     *
+     * @return \Illuminate\Contracts\View\Factory|\Illuminate\View\View
+     */
+    public function getOverview($id)
+    {
+        // test if given content id is static page and if exists
+        $content = Content::findOrFail($id);
+
+        $history = $this->history->getStructuredHistoryOf($content);
+
+        return view('admin/history.overview', [
+            'history' => $history,
+            'page'    => $content
+        ]);
+    }
+
+    public function getDiff($revision, $id)
+    {
+        $change = $this->history->findOrFail($id);
+        $diff = $this->history->getDiff($change);
+
+        return view('admin/history.diff', [
+            'change'     => $change,
+            'columnName' => 'Page content',
+            'diff'       => $diff
+        ]);
+    }
+}

app/Http/routes.php

@@ -81,6 +81,14 @@ Route::group([
     Route::get('users/overview/{state?}/{perPage?}', 'UsersOverview@getOverview')
          ->name('users.overview');
 
+    // history of changes for specified page
+    Route::get('history/{id}', 'History@getOverview')
+         ->name('content.history');
+
+    // history of changes for specified page
+    Route::get('history/{revision}/{id}', 'History@getDiff')
+         ->name('history.diff');
+
     // custom fields
     // ------------------------------