Add tag endpoint.

app/Support/Binder/TagOrId.php

@@ -0,0 +1,64 @@
+<?php
+/**
+ * TagOrId.php
+ * Copyright (c) 2018 thegrumpydictator@gmail.com
+ *
+ * This file is part of Firefly III.
+ *
+ * Firefly III is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * Firefly III is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with Firefly III. If not, see <http://www.gnu.org/licenses/>.
+ */
+declare(strict_types=1);
+
+namespace FireflyIII\Support\Binder;
+
+use FireflyIII\Models\Tag;
+use FireflyIII\Repositories\Tag\TagRepositoryInterface;
+use Illuminate\Routing\Route;
+use Illuminate\Support\Collection;
+use Log;
+use Symfony\Component\HttpKernel\Exception\NotFoundHttpException;
+
+/**
+ * Class TagOrId.
+ */
+class TagOrId implements BinderInterface
+{
+    /**
+     * @param string $value
+     * @param Route  $route
+     *
+     * @return Collection
+     * @throws \Symfony\Component\HttpKernel\Exception\NotFoundHttpException
+     */
+    public static function routeBinder(string $value, Route $route): Tag
+    {
+        if (auth()->check()) {
+            /** @var TagRepositoryInterface $repository */
+            $repository = app(TagRepositoryInterface::class);
+            $repository->setUser(auth()->user());
+
+            $result = $repository->findByTag($value);
+            if (null === $result) {
+                $result = $repository->findNull((int)$value);
+            }
+            if (null !== $result) {
+                return $result;
+            }
+            Log::error('TagOrId: tag not found.');
+            throw new NotFoundHttpException;
+        }
+        Log::error('TagOrId: user is not logged in.');
+        throw new NotFoundHttpException;
+    }
+}