feat(conversation): add validation for destination hash in ping functionality to ensure correct format and existence

meshchatx/src/frontend/components/messages/ConversationDropDownMenu.vue

@@ -168,9 +168,20 @@ export default {
             }
         },
         async onPingDestination() {
+            if (!this.peer || !this.peer.destination_hash) {
+                DialogUtils.alert("Invalid destination hash");
+                return;
+            }
+
+            const destinationHash = this.peer.destination_hash;
+            if (destinationHash.length !== 32 || !/^[0-9a-fA-F]+$/.test(destinationHash)) {
+                DialogUtils.alert("Invalid destination hash format");
+                return;
+            }
+
             try {
                 // ping destination
-                const response = await window.axios.get(`/api/v1/ping/${this.peer.destination_hash}/lxmf.delivery`, {
+                const response = await window.axios.get(`/api/v1/ping/${destinationHash}/lxmf.delivery`, {
                     params: {
                         timeout: 30,
                     },
@@ -181,7 +192,7 @@ export default {
                 const rttDurationString = `${rttMilliseconds} ms`;
 
                 const info = [
-                    `Valid reply from ${this.peer.destination_hash}`,
+                    `Valid reply from ${destinationHash}`,
                     `Duration: ${rttDurationString}`,
                     `Hops There: ${pingResult.hops_there}`,
                     `Hops Back: ${pingResult.hops_back}`,