Fix the regular expression in the getDuration method to prevent ReDoS attacks and update error messages in test cases.

server/modules/apicache/apicache.js

@@ -485,7 +485,7 @@ function ApiCache() {
         }
 
         if (typeof duration === "string") {
-            let split = duration.match(/^([\d\.,]+)\s?(\w+)$/);
+            let split = duration.match(/^([\d\.,]+)\s?((?:(?!\d)\w)+)$/);
 
             if (split.length === 3) {
                 let len = parseFloat(split[1]);

test/backend-test/test-apicache-ReDos.js

@@ -0,0 +1,26 @@
+const semver = require("semver");
+let test;
+const nodeVersion = process.versions.node;
+if (semver.satisfies(nodeVersion, ">= 18")) {
+    test = require("node:test");
+} else {
+    test = require("test");
+}
+const apicacheModule = require("../../server/modules/apicache/apicache.js");
+
+const assert = require("node:assert");
+
+test("Test ReDos - attack string", async (t) => {
+    const getDuration = apicacheModule.getDuration;
+    const str = "" + "00".repeat(100000) + "\u0000";
+    const startTime = performance.now();
+    try {
+        getDuration(str);
+    } catch (error) {
+    // pass
+    }
+    const endTime = performance.now();
+    const elapsedTime = endTime - startTime;
+    const reDosThreshold = 9000;
+    assert(elapsedTime <= reDosThreshold, `🚨 Potential ReDoS Attack! getDuration method took ${elapsedTime.toFixed(2)} ms, exceeding threshold of ${reDosThreshold} ms.`);
+});