Fix: Restrict email registration to Gmail addresses

[Aishu9Para]

📌 Linked Issue

• Connected to ENHANCEMENT : Signup Page Accepts Invalid Email Domains During Registration #171

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🛠 Changes Made

• Added: Gmail domain validation in frontend (Register.jsx) to restrict email registration to @gmail.com
• Added: Backend validation in userController.js to enforce Gmail-only registration for security
• Fixed: Issue where users could register with any @*.com email
• Updated: Error handling to display clear message when non-Gmail address is used

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🧪 Testing

• Ran unit tests (npm test)

• Tested manually (describe below):

  • Test case 1: Entered test@yahoo.com → Expected: Error message "Only Gmail addresses are allowed." → Result: Validation blocked successfully.

  • Test case 2: Entered test@gmail.com → Expected: Account created successfully → Result: Registration successful.

  • Test case 3: Entered TEST@GMAIL.COM → Expected: Registration allowed (case-insensitive check) → Result: Successful.

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📸 UI Changes (if applicable)

Before	After
Allowed registration with any email domain	Restricts registration to Gmail addresses with proper error message

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📝 Documentation Updates

• Updated README/docs
• Added code comments explaining validation logic

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✅ Checklist

• Created a new branch for PR
• Have starred the repository
• Follows JavaScript Styleguide
• No console warnings/errors
• Commit messages follow Git Guidelines

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💡 Additional Notes (If any)

Frontend validation prevents invalid submissions, while backend validation ensures security against API-level bypass attempts.
This ensures consistent and secure enforcement of Gmail-only registration.

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