From c8eb678db96bc48bb0fa8578fb4c99c88846c1f4 Mon Sep 17 00:00:00 2001
From: ruan <ruany@users.noreply.github.com>
Date: Sat, 22 Sep 2018 14:22:19 +0200
Subject: [PATCH] Add #39

---
 check.php    | 10 ++++++++--
 inc/page.php | 35 +++++++++++++++++++++++++++++++++++
 2 files changed, 43 insertions(+), 2 deletions(-)

diff --git a/check.php b/check.php
index bb5d699..bdbc17b 100644
--- a/check.php
+++ b/check.php
@@ -4,15 +4,21 @@ require_once './inc/page.php';
 class Check {
     public function run($name, $from) {
         $page = new Page("check", false);
+
+        $column = "name";
+
         // validate user input
-        if (strlen($name) > 16 || !preg_match("/^[0-9a-zA-Z_]{1,16}$/", $name)) {
+        if ($page->is_uuid($name) && preg_match("/^[0-9a-zA-Z-]{32,36}$/", $name)) {
+            $column = "uuid";
+            $name = $page->uuid_dashify($name);
+        } else if (strlen($name) > 16 || !preg_match("/^[0-9a-zA-Z_]{1,16}$/", $name)) {
             $this->println($page->t("error.name.invalid"));
             return;
         }
         $history = $page->settings->table['history'];
 
         try {
-            $stmt = $page->conn->prepare("SELECT name,uuid FROM $history WHERE name=? ORDER BY date LIMIT 1");
+            $stmt = $page->conn->prepare("SELECT name,uuid FROM $history WHERE $column=? ORDER BY date LIMIT 1");
             if ($stmt->execute(array($name))) {
                 if ($row = $stmt->fetch()) {
                     $name = $row['name'];
diff --git a/inc/page.php b/inc/page.php
index 232bda5..56eda0a 100644
--- a/inc/page.php
+++ b/inc/page.php
@@ -396,6 +396,41 @@ class Page {
         return ($millis > $until);
     }
 
+    /**
+     * Returns true if a string should be treated as a UUID.
+     * @param $str
+     * @return bool
+     */
+    function is_uuid($str) {
+        $len = strlen($str);
+        return $len == 32 || $len == 36;
+    }
+
+    function uuid_dashify($str) {
+        $len = strlen($str);
+        if ($len !== 32) return $str;
+        $newstr = "";
+        $total = 0; // current character (all chars)
+        $cur = 0; // current position in chunk, resets to 0 when it reaches limit
+        $chunk = 0; // current amount of "-" characters, 5 chunks are in a UUID (1-2-3-4-5)
+        $limit = 8; // maximum amount of characters in the current chunk (8-4-4-4-12)
+        for ($i = 0; $i < $len; $i++) {
+            $chr = $str[$i];
+            $total++;
+            $newstr .= $chr;
+            if (++$cur >= $limit) {
+                $cur = 0;
+                if ($total < 32) {
+                    $newstr .= '-';
+                }
+                $chunk++;
+                if ($chunk == 1) $limit = 4;
+                if ($chunk >= 4) $limit = 12;
+            }
+        }
+        return $newstr;
+    }
+
     function print_title() {
         $title = $this->title;
         $name = $this->settings->name;