fix: lowercase alternative host email addresses for case insensitive comparisons

Author: karenliulll

locallib.php

@@ -795,6 +795,13 @@ function zoom_get_alternative_host_array_from_string($alternativehoststring) {
     // The Zoom API has historically returned either semicolons or commas, so we need to support both.
     $alternativehoststring = str_replace(';', ',', $alternativehoststring);
     $alternativehostarray = array_filter(explode(',', $alternativehoststring));
+
+    // Lowercase email addresses so that we can do case-insensitive comparisons.
+    foreach ($alternativehostarray as $key => $value) {
+        if (filter_var($value, FILTER_VALIDATE_EMAIL) !== false) {
+            $alternativehostarray[$key] = strtolower($value);
+        }
+    }
     return $alternativehostarray;
 }
 
@@ -962,7 +969,12 @@ function zoom_load_meeting($id, $context, $usestarturl = true) {
 
     $userisrealhost = (zoom_get_user_id(false) === $zoom->host_id);
     $alternativehosts = zoom_get_alternative_host_array_from_string($zoom->alternative_hosts);
-    $userishost = ($userisrealhost || in_array(zoom_get_api_identifier($USER), $alternativehosts, true));
+    // Lowercase email addresses so that we can do case-insensitive comparisons.
+    if (filter_var(zoom_get_api_identifier($USER), FILTER_VALIDATE_EMAIL) !== false) {
+        $userishost = ($userisrealhost || in_array(strtolower(zoom_get_api_identifier($USER)), $alternativehosts, true));
+    } else {
+        $userishost = ($userisrealhost || in_array(zoom_get_api_identifier($USER), $alternativehosts, true));
+    }
 
     // Check if we should use the start meeting url.
     if ($userisrealhost && $usestarturl) {

view.php

@@ -64,7 +64,12 @@
 $alternativehosts = zoom_get_alternative_host_array_from_string($zoom->alternative_hosts);
 
 // Check if this user is the host or an alternative host.
-$userishost = ($userisrealhost || in_array(zoom_get_api_identifier($USER), $alternativehosts, true));
+// Lowercase email addresses so that we can do case-insensitive comparisons.
+if (filter_var(zoom_get_api_identifier($USER), FILTER_VALIDATE_EMAIL) !== false) {
+    $userishost = ($userisrealhost || in_array(strtolower(zoom_get_api_identifier($USER)), $alternativehosts, true));
+} else {
+    $userishost = ($userisrealhost || in_array(zoom_get_api_identifier($USER), $alternativehosts, true));
+}
 
 // Get host user from Zoom.
 $showrecreate = false;