add safe message time and message validations

src/utils/utils.ts

@@ -1,5 +1,8 @@
 import { randomBytes } from 'crypto';
 
+const MULTISIG_REGEX_PATTERN =
+  /wants you to sign in with your Ethereum account:.*0x[a-fA-F0-9]+.*URI: https?:\/\/.*Version: \d+.*Chain ID: \d+.*Nonce: .*Issued At: .*/;
+
 export const generateRandomString = (len: number): string => {
   return randomBytes(len).toString('hex');
 };
@@ -14,26 +17,40 @@ export const networkIds = {
   gnosis: 100,
 };
 
+function isValidSafeLoginMessage(safeMessage: any): boolean {
+  return MULTISIG_REGEX_PATTERN.test(safeMessage.message);
+}
+
 export const findObjectByClosestTimestamp = (
   target: number,
   objects: any[],
 ) => {
   if (objects.length === 0) return null;
 
-  const dateLabelObjects = objects.filter(item => item.type !== 'DATE_LABEL');
+  const safeMessages = objects.filter(item => item.type !== 'DATE_LABEL');
+  const dateLabelObjects = safeMessages.filter(isValidSafeLoginMessage);
 
   let closestObj = dateLabelObjects[0];
   let closestTimestamp = closestObj.creationTimestamp;
   let smallestDifference = Math.abs(target - closestTimestamp);
+  const tenMinutesInMilliseconds = 10 * 60 * 1000;
+  const currentTime = new Date().getTime();
 
   dateLabelObjects.forEach(obj => {
     const difference = Math.abs(target - obj.creationTimestamp);
-    if (difference < smallestDifference) {
+    if (
+      difference <= tenMinutesInMilliseconds &&
+      difference < smallestDifference
+    ) {
       smallestDifference = difference;
       closestObj = obj;
       closestTimestamp = obj.creationTimestamp;
     }
   });
 
+  if (currentTime - closestTimestamp > tenMinutesInMilliseconds) {
+    return null;
+  }
+
   return closestObj;
 };