Create anomalyDetection.js

src/security/anomalyDetection.js

@@ -0,0 +1,63 @@
+// anomalyDetection.js
+
+class AnomalyDetection {
+    constructor() {
+        this.transactionHistory = [];
+        this.threshold = {
+            amount: 1000, // Example threshold for transaction amount
+            frequency: 5,  // Example threshold for transaction frequency
+        };
+    }
+
+    // Log a transaction
+    logTransaction(userId, amount) {
+        const transaction = {
+            userId,
+            amount,
+            timestamp: new Date(),
+        };
+        this.transactionHistory.push(transaction);
+        console.log(`Transaction logged: ${JSON.stringify(transaction)}`);
+    }
+
+    // Check for anomalies in the transaction history
+    checkForAnomalies(userId) {
+        const userTransactions = this.transactionHistory.filter(tx => tx.userId === userId);
+        const totalAmount = userTransactions.reduce((sum, tx) => sum + tx.amount, 0);
+        const transactionCount = userTransactions.length;
+
+        const anomalies = [];
+        if (totalAmount > this.threshold.amount) {
+            anomalies.push(`High transaction amount: $${totalAmount}`);
+        }
+        if (transactionCount > this.threshold.frequency) {
+            anomalies.push(`High transaction frequency: ${transactionCount} transactions`);
+        }
+
+        return anomalies;
+    }
+}
+
+// Example usage
+(async () => {
+    const anomalyDetector = new AnomalyDetection();
+    const userId = 'user123';
+
+    // Simulate logging transactions
+    anomalyDetector.logTransaction(userId, 500);
+    anomalyDetector.logTransaction(userId, 600);
+    anomalyDetector.logTransaction(userId, 200);
+    anomalyDetector.logTransaction(userId, 300);
+    anomalyDetector.logTransaction(userId, 1500); // This should trigger an anomaly
+
+ // Check for anomalies
+    const anomalies = anomalyDetector.checkForAnomalies(userId);
+    if (anomalies.length > 0) {
+        console.log(`Anomalies detected for user ${userId}: ${anomalies.join(', ')}`);
+    } else {
+        console.log(`No anomalies detected for user ${userId}.`);
+    }
+})();
+
+export default AnomalyDetection;
+