added solution for 02-jwt

Author: ekanshka

week-3/02-jwt/index.js

@@ -1,5 +1,10 @@
 const jwt = require('jsonwebtoken');
 const jwtPassword = 'secret';
+const z = require('zod');
+
+
+usernameSchema = z.string().email();
+passwordSchema = z.string().min(6);
 
 
 /**
@@ -15,6 +20,17 @@ const jwtPassword = 'secret';
  */
 function signJwt(username, password) {
     // Your code here
+    const usernameResponse = usernameSchema.safeParse(username);
+    const passwordResponse = passwordSchema.safeParse(password);
+
+    if (!usernameResponse.success || !passwordResponse.success) {
+        return null;
+    }
+
+    const signature = jwt.sign({username, password}, jwtPassword);
+    console.log(signature);
+
+    return signature;
 }
 
 /**
@@ -27,17 +43,29 @@ function signJwt(username, password) {
  */
 function verifyJwt(token) {
     // Your code here
+    try {
+        jwt.verify(token, jwtPassword)
+        return true;
+    } catch (error) {
+        return false;
+    }
+
 }
 
 /**
  * Decodes a JWT to reveal its payload without verifying its authenticity.
  *
  * @param {string} token - The JWT string to decode.
- * @returns {object|false} The decoded payload of the JWT if the token is a valid JWT format.
+ * @returns {object|false} Returns true if the decoded payload of the JWT if the token is a valid JWT format.
  *                         Returns false if the token is not a valid JWT format.
  */
 function decodeJwt(token) {
     // Your code here
+    const decoded = jwt.decode(token);
+    if (decoded) {
+        return true;
+    }
+    else return false;
 }
 
 

week-3/02-jwt/tests/index.spec.js

@@ -48,18 +48,18 @@ describe('decodeJwt', () => {
 describe('verifyJwt', () => {
 	test('cant decode a jwt with diff password correctly', () => {
 		const token = jwt.sign({ username: '[email protected]', password: '123456' }, "randomPassword");
-		const decoded = verifyJwt(token);
-		expect(decoded).toBe(false);
+		const verified = verifyJwt(token);
+		expect(verified).toBe(false);
 	});
 
 	test('decodes a jwt with same password correctly', () => {
 		const token = jwt.sign({ username: '[email protected]', password: '123456' }, jwtPassword);
-		const decoded = verifyJwt(token);
-		expect(decoded).toBe(true);
+		const verified = verifyJwt(token);
+		expect(verified).toBe(true);
 	});
 
 	test('cant decode a non jwt string', () => {
-		const decoded = verifyJwt("token");
-		expect(decoded).toBe(false);
+		const verified = verifyJwt("token");
+		expect(verified).toBe(false);
 	});
 });