added md5 hash search to API as type "hash"

app/SongListComposer.php

@@ -165,6 +165,7 @@ protected function searchableKeys()
             'author' => 'sd.author_name',
             'name'   => 's.name',
             'user'   => 'u.name',
+            'hash'   => 'sd.hash_md5',
             'song'   => ['sd.song_name', 'sd.song_sub_name'],
             'all'    => ['sd.song_name', 'sd.song_sub_name', 'sd.author_name', 's.name', 'u.name'],
         ];

database/migrations/2018_07_11_191816_add_hash_index_to_song_details.php

@@ -0,0 +1,32 @@
+<?php
+
+use Illuminate\Support\Facades\Schema;
+use Illuminate\Database\Schema\Blueprint;
+use Illuminate\Database\Migrations\Migration;
+
+class AddHashIndexToSongDetails extends Migration
+{
+    /**
+     * Run the migrations.
+     *
+     * @return void
+     */
+    public function up()
+    {
+        Schema::table('song_details', function (Blueprint $table) {
+            $table->index(['hash_md5', 'hash_sha1']);
+        });
+    }
+
+    /**
+     * Reverse the migrations.
+     *
+     * @return void
+     */
+    public function down()
+    {
+        Schema::table('song_details', function (Blueprint $table) {
+            $table->dropIndex(['hash_md5', 'hash_sha1']);
+        });
+    }
+}