[JS][6kyu] Brute Force Detector

codewars/6kyu/brute-force-detector/koronya.js

@@ -0,0 +1,46 @@
+// [JS][6kyu] Brute Force Detector
+// brute-force-detector
+// https://www.codewars.com/kata/695688e9858d531c29a9d748/train/javascript
+
+const detectBruteForce = (logs) => {
+  const userMap = new Map()
+  const resultSet = new Set()
+  logs.forEach((log) => {
+    const [ip, status, user] = log.split(' ')
+    if (!userMap.has(ip)) {
+      userMap.set(ip, 0)
+    }
+    if (resultSet.has(ip)) {
+      return
+    }
+
+    if (status === 'LOGIN_SUCCESS') {
+      userMap.set(ip, 0)
+    } else {
+      const failCount = userMap.get(ip)
+      userMap.set(ip, failCount + 1)
+      if (userMap.get(ip) === 3) {
+        resultSet.add(ip)
+      }
+    }
+  })
+  return Array.from(resultSet).sort()
+}
+
+const logs = ['192.168.1.1 LOGIN_FAIL user=admin', '192.168.1.1 LOGIN_FAIL user=admin', '192.168.1.1 LOGIN_FAIL user=admin']
+detectBruteForce(logs)
+
+const logs2 = [
+  '9.9.9.9 LOGIN_FAIL user=a',
+  '1.1.1.1 LOGIN_FAIL user=b',
+  '9.9.9.9 LOGIN_FAIL user=a',
+  '1.1.1.1 LOGIN_FAIL user=b',
+  '9.9.9.9 LOGIN_FAIL user=a',
+  '1.1.1.1 LOGIN_FAIL user=b',
+]
+detectBruteForce(logs2)
+
+const logs3 = ['10.0.0.5 LOGIN_FAIL user=x', '10.0.0.5 LOGIN_FAIL user=x', '10.0.0.5 LOGIN_SUCCESS user=x', '10.0.0.5 LOGIN_FAIL user=x']
+detectBruteForce(logs3)
+
+detectBruteForce([])