From 3aa27ae5972237162a09b04af60b6798c3602e8b Mon Sep 17 00:00:00 2001
From: "Lin, Hung-Shin" <wancat@wancat.cc>
Date: Thu, 14 Sep 2023 17:39:26 +0800
Subject: [PATCH] feat: add username and email validation function

---
 server/src/utils/auth.js        | 39 +++++++++++++++++++++++++++++
 server/tests/utils/auth.test.js | 44 +++++++++++++++++++++++++++++++++
 2 files changed, 83 insertions(+)
 create mode 100644 server/tests/utils/auth.test.js

diff --git a/server/src/utils/auth.js b/server/src/utils/auth.js
index 3e29a82..9199286 100644
--- a/server/src/utils/auth.js
+++ b/server/src/utils/auth.js
@@ -59,3 +59,42 @@ export function verifyJWT(token) {
     })
   })
 }
+
+export function isValidUsername(username) {
+  // Define a regular expression pattern for a valid Linux username.
+  const usernamePattern = /^[a-z][a-z0-9_-]*$/
+
+  // Test the username against the pattern.
+  if (!usernamePattern.test(username)) return false
+
+  // check if the username is between 1 and 32 characters
+  if (username.length < 1 || username.length > 32) {
+    return false
+  }
+
+  const reservedWords = [
+    'root',
+    'admin',
+    'administrator',
+    'sysadmin',
+    'system',
+    'daemon',
+    'bin',
+    'nobody',
+    'nogroup',
+    'guest',
+    'user',
+  ]
+  if (reservedWords.includes(username)) {
+    return false
+  }
+  return true
+}
+
+export function isValidEmail(email) {
+  // Define a regular expression pattern for a valid email address.
+  const emailPattern = /^[\w-.+]+@([\w][\w-]*\.)+[\w-]{2,}$/
+
+  // Test the email against the pattern.
+  return emailPattern.test(email)
+}
diff --git a/server/tests/utils/auth.test.js b/server/tests/utils/auth.test.js
new file mode 100644
index 0000000..3df34ed
--- /dev/null
+++ b/server/tests/utils/auth.test.js
@@ -0,0 +1,44 @@
+import { isValidEmail, isValidUsername } from '../../src/utils/auth'
+
+test('check valid username', () => {
+  const valid = ['alex', 'alex123', 'john_doe', 'john-doe', 'rudeus']
+
+  const invalid = ['root', 'admin', '12michael', 'Justin', 'testUser']
+
+  valid.forEach((username) => {
+    expect(isValidUsername(username)).toBe(true)
+  })
+
+  invalid.forEach((username) => {
+    expect(isValidUsername(username)).toBe(false)
+  })
+})
+
+test('check valid email', () => {
+  const validEmails = [
+    'user@example.com',
+    'user.name@example.co.uk',
+    'user1234@email.domain',
+    'user+tag@example.net',
+    'user@subdomain.example.com',
+    'user@123.45.67.89',
+  ]
+
+  const invalidEmails = [
+    'user@.com',
+    '@example.com',
+    'user@-invalid-domain.com',
+    'user@.123',
+    'user@.123.45.67',
+  ]
+
+  validEmails.forEach((email) => {
+    console.log(email)
+    expect(isValidEmail(email)).toBe(true)
+  })
+
+  invalidEmails.forEach((email) => {
+    console.log(email)
+    expect(isValidEmail(email)).toBe(false)
+  })
+})