From 03340c18ead651ef9e11f883745695f2edafbae3 Mon Sep 17 00:00:00 2001
From: ArthurHoaro <arthur@hoa.ro>
Date: Tue, 12 May 2020 12:44:48 +0200
Subject: Slim router: handle add tag route

---
 application/front/controllers/TagController.php | 74 +++++++++++++++++++++++++
 1 file changed, 74 insertions(+)
 create mode 100644 application/front/controllers/TagController.php

(limited to 'application/front')

diff --git a/application/front/controllers/TagController.php b/application/front/controllers/TagController.php
new file mode 100644
index 00000000..598275b0
--- /dev/null
+++ b/application/front/controllers/TagController.php
@@ -0,0 +1,74 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Shaarli\Front\Controller;
+
+use Slim\Http\Request;
+use Slim\Http\Response;
+
+/**
+ * Class TagController
+ *
+ * Slim controller handle tags.
+ *
+ * @package Front\Controller
+ */
+class TagController extends ShaarliController
+{
+    /**
+     * Add another tag in the current search through an HTTP redirection.
+     *
+     * @param array $args Should contain `newTag` key as tag to add to current search
+     */
+    public function addTag(Request $request, Response $response, array $args): Response
+    {
+        $newTag = $args['newTag'] ?? null;
+        $referer = $this->container->environment['HTTP_REFERER'] ?? null;
+
+        // In case browser does not send HTTP_REFERER, we search a single tag
+        if (null === $referer) {
+            if (null !== $newTag) {
+                return $response->withRedirect('./?searchtags='. urlencode($newTag));
+            }
+
+            return $response->withRedirect('./');
+        }
+
+        $currentUrl = parse_url($this->container->environment['HTTP_REFERER']);
+        parse_str($currentUrl['query'] ?? '', $params);
+
+        if (null === $newTag) {
+            return $response->withRedirect(($currentUrl['path'] ?? './') .'?'. http_build_query($params));
+        }
+
+        // Prevent redirection loop
+        if (isset($params['addtag'])) {
+            unset($params['addtag']);
+        }
+
+        // Check if this tag is already in the search query and ignore it if it is.
+        // Each tag is always separated by a space
+        $currentTags = isset($params['searchtags']) ? explode(' ', $params['searchtags']) : [];
+
+        $addtag = true;
+        foreach ($currentTags as $value) {
+            if ($value === $newTag) {
+                $addtag = false;
+                break;
+            }
+        }
+
+        // Append the tag if necessary
+        if (true === $addtag) {
+            $currentTags[] = trim($newTag);
+        }
+
+        $params['searchtags'] = trim(implode(' ', $currentTags));
+
+        // We also remove page (keeping the same page has no sense, since the results are different)
+        unset($params['page']);
+
+        return $response->withRedirect(($currentUrl['path'] ?? './') .'?'. http_build_query($params));
+    }
+}
-- 
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