From c95df4cf50035e5018974ff9daca0bb2b2e4ae1a Mon Sep 17 00:00:00 2001
From: svanschu <sven@schultschik.de>
Date: Mon, 13 Nov 2017 23:32:09 +0100
Subject: [PATCH] #29 use change frequency as max age

---
 .../views/xml/tmpl/default.php                |  2 +-
 .../views/xml/view.html.php                   | 33 +++++++++++++++++++
 2 files changed, 34 insertions(+), 1 deletion(-)

diff --git a/components/com_schuweb_sitemap/views/xml/tmpl/default.php b/components/com_schuweb_sitemap/views/xml/tmpl/default.php
index 15a7a4b..06d7766 100644
--- a/components/com_schuweb_sitemap/views/xml/tmpl/default.php
+++ b/components/com_schuweb_sitemap/views/xml/tmpl/default.php
@@ -24,7 +24,7 @@
     }
 
     if ($params->get('cacheControlUseChangeFrequency', 1) == 1) {
-//TODO
+        $cacheControl += 'max-age=' + $this->changeFreq;
     } else {
         if ($maxAge = $params->getInt('cacheControlMaxAge', 0) > 0) {
             $cacheControl += 'max-age=' + $maxAge;
diff --git a/components/com_schuweb_sitemap/views/xml/view.html.php b/components/com_schuweb_sitemap/views/xml/view.html.php
index 5d78002..7a7109a 100644
--- a/components/com_schuweb_sitemap/views/xml/view.html.php
+++ b/components/com_schuweb_sitemap/views/xml/view.html.php
@@ -63,6 +63,39 @@ function display($tpl = null)
         $this->sitemapItems = $this->get('SitemapItems');
         $this->extensions = $this->get('Extensions');
 
+        $freq = 31536000;
+        foreach ($this->items as $item) {
+            foreach ($item as $iitem) {
+                foreach ($iitem->items as $iitems) {
+                    switch ($iitems->changefreq) {
+                        case "never":
+                        case "yearly":
+                            if ($freq > 31536000)
+                                $freq = 31536000;
+                            break;
+                        case "monthly":
+                            if ($freq > 18144000)
+                                $freq = 18144000;
+                            break;
+                        case "weekly":
+                            if ($freq > 604800)
+                                $freq = 604800;
+                            break;
+                        case "daily": //60 Sekunden x 60 Minuten x 24 Stunden
+                            if ($freq > 86400)
+                                $freq = 86400;
+                            break;
+                        case "hourly":
+                            if ($freq > 3600)
+                                $freq = 3600;
+                            break;
+                    }
+                }
+            }
+        }
+
+        $this->changeFreq = $freq;
+
         // Check for errors.
         if (count($errors = $this->get('Errors'))) {
             $app->enqueueMessage(implode("\n", $errors), 'warning');