Fix debugTable creation in iframe mode

Author: martialblog

CHANGELOG.md

@@ -17,7 +17,7 @@ It now uses the check interval to determine how long a graph's image is cached.
 - PHP 8.2 and PHP 8.3 Support
 - Support strict CSP
 - Dark/Light Theme depending on user's settings (removed the `theme` configuration option)
-- Debug information can be requested via the `debugGrafana` URL parameter (removed the `debug` configuration option)
+- Debug information can be requested via the `grafanaDebug` URL parameter (removed the `debug` configuration option)
 
 **Fixes**
 - Use of special characters in custom variables now works

doc/03-module-configuration.md

@@ -40,6 +40,8 @@ ssl_verifypeer = "0"
 ssl_verifyhost = "0"
 ```
 
+Hint: to display debug information for graphs you can use the URL parameter `&grafanaDebug`. This requires the `grafana/debug` permission.
+
 ## Available Options
 
 |Setting                | Short description|

library/Grafana/ProvidedHook/Icingadb/IcingaDbGrapher.php

@@ -472,7 +472,7 @@ public function getPreviewHtml(Model $object, $report = false)
         // Add a data table with runtime information and configuration for debugging purposes
         if (Url::fromRequest()->hasParam('grafanaDebug') && $this->permission->hasPermission('grafana/debug') && $report === false) {
             $returnHtml->addHtml(HtmlElement::create('h2', null, 'Performance Graph Debug'));
-            $returnHtml->add($this->createDebugTable());
+            $returnHtml->add($this->createDebugTable($previewHtml));
         }
 
         $htmlForObject = HtmlElement::create("div", ["class" => "icinga-module module-grafana"]);
@@ -486,15 +486,12 @@ public function getPreviewHtml(Model $object, $report = false)
     /**
      * createDebugTable creates a data table with runtime information and configuration for debugging purposes
      */
-    private function createDebugTable()
+    private function createDebugTable($previewHtml)
     {
-        if ($this->accessMode === 'indirectproxy') {
-            $usedUrl = $this->pngUrl;
-        } else {
-            $usedUrl = preg_replace('/.*?src\s*=\s*[\'\"](.*?)[\'\"].*/', "$1", $previewHtml);
-        }
+        $usedUrl = $this->pngUrl;
 
         if ($this->accessMode === 'iframe') {
+            $usedUrl = preg_replace('/.*?src\s*=\s*[\'\"](.*?)[\'\"].*/', "$1", $previewHtml);
             $this->height = '100%';
         }