Contact person: Business Client

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Location: Hanumāngarh, India

Budget: Recommended by industry experts

Time to start: As soon as possible

Project description:
"I already have a working Google Apps Script web-app with several standalone pages delivered through individual doGet handlers. I recently built a custom login flow that stores user data in a Google Sheet, but at the moment only the first page is tied into that flow. I need the whole project refactored so every page is protected by the same session-based authentication and users cannot bypass it via direct URL access.

What I have in place
• A Spreadsheet-driven user table (username, hashed password, status)
• A basic login HTML form served by HTMLService
• Initial server-side checks that create a session token in Script Properties

What I want from you
• Extend the current login logic so all existing doGet pages check the session token before rendering.
• Route unauthenticated visitors automatically to the login page, preserving the requested URL so I can redirect them back after successful sign-in.
• Keep everything client-side lightweight—prefer vanilla JS or the Apps Script HTML templating helpers I already use.
• Make the code clean, modular, and commented so I can maintain it later.

Acceptance criteria
1. Any direct link to a protected page prompts for login first.
2. Successful login redirects to the originally requested page.
3. Manual manipulation of URLs or parameters never reveals page content without a valid session token.
4. All updates are delivered as a single .gs project file plus any modified HTML templates.

I will share the current code repository along with a demo account so you can test locally in the Apps Script IDE." (client-provided description)