Added token, user, userRepository and userSecurity in user folder. This handles creating new users, loging in and creating a user specific token then returning it when logging in.

seasoned_api/src/user/token.js

@@ -0,0 +1,38 @@
+const User = require('src/user/user');
+const jwt = require('jsonwebtoken');
+
+class Token {
+
+  constructor(user) {
+    this.user = user;
+  }
+
+  /**
+   * Generate a new token.
+   * @param {String} secret a cipher of the token
+   * @returns {String}
+   */
+  toString(secret) {
+    return jwt.sign({ username: this.user.username }, secret);
+  }
+
+  /**
+   * Decode a token.
+   * @param {Token} jwtToken an encrypted token
+   * @param {String} secret a cipher of the token
+   * @returns {Token}
+   */
+  static fromString(jwtToken, secret) {
+    let username = null;
+
+    try {
+      username = jwt.verify(jwtToken, secret).username;
+    } catch (error) {
+      throw new Error('The token is invalid.');
+    }
+    const user = new User(username);
+    return new Token(user);
+  }
+}
+
+module.exports = Token;