Add MediaBlocklist feature

app/Http/Controllers/MediaBlocklistController.php

@@ -0,0 +1,50 @@
+<?php
+
+namespace App\Http\Controllers;
+
+use Illuminate\Http\Request;
+use App\MediaBlocklist;
+
+class MediaBlocklistController extends Controller
+{
+    public function __construct()
+    {
+    	$this->middleware('auth');
+    	$this->middleware('admin');
+    }
+
+    public function add(Request $request)
+    {
+    	$this->validate($request, [
+    		'hash' => 'required|string|size:64',
+    		'name' => 'nullable|string',
+    		'description' => 'nullable|string|max:500',
+    	]);
+
+    	$hash = $request->input('hash');
+    	abort_if(preg_match("/^([a-f0-9]{64})$/", $hash) !== 1, 400);
+
+    	$name = $request->input('name');
+    	$description = $request->input('description');
+
+    	$mb = new MediaBlocklist;
+    	$mb->sha256 = $hash;
+    	$mb->name = $name;
+    	$mb->description = $description;
+    	$mb->save();
+
+    	return redirect('/i/admin/media?layout=banned');
+    }
+
+    public function delete(Request $request)
+    {
+        $this->validate($request, [
+            'id'    => 'required|integer'
+        ]);
+
+        $media = MediaBlocklist::findOrFail($request->input('id'));
+        $media->delete();
+
+        return redirect('/i/admin/media?layout=banned');
+    }
+}