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feat: implement Google OAuth 2.0 sign-in #1145 #1163

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feat: implement Google OAuth 2.0 sign-in #1145
anushkagupta200615-jpg Jun 16, 2026
633c2ae
Merge branch 'main' into feat/google-oauth
Charushi06 Jul 12, 2026
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6 changes: 6 additions & 0 deletions .env.example
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Original file line number Diff line number Diff line change
Expand Up @@ -6,3 +6,9 @@ GEMINI_API_KEY=your_gen_ai_key_here

# Server Port (optional, defaults to 3000)
PORT=3000

# Google OAuth 2.0 Client ID for Sign-In
GOOGLE_CLIENT_ID=your_google_client_id_here

# JWT Secret for Session Management
JWT_SECRET=your_jwt_secret_here
10 changes: 10 additions & 0 deletions database.js
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Original file line number Diff line number Diff line change
Expand Up @@ -5,6 +5,16 @@ const db = new sqlite3.Database(path.join(__dirname, 'studyplan.db'));

function initDb() {
db.serialize(() => {
// Users Table
db.run(`CREATE TABLE IF NOT EXISTS users (
id TEXT PRIMARY KEY,
email TEXT UNIQUE NOT NULL,
name TEXT,
picture TEXT,
auth_provider TEXT DEFAULT 'local',
password TEXT,
created_at DATETIME DEFAULT CURRENT_TIMESTAMP
)`);

// Subjects Table
db.run(`CREATE TABLE IF NOT EXISTS subjects (
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49 changes: 49 additions & 0 deletions index.html
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Original file line number Diff line number Diff line change
Expand Up @@ -11,6 +11,7 @@
<link rel="icon" type="image/x-icon" href="/public/favicon.ico" />
<link href="https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700&display=swap" rel="stylesheet">
<link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/font-awesome/6.4.0/css/all.min.css">
<script src="https://accounts.google.com/gsi/client" async defer></script>
</head>
<body>
<!-- Auth Modal -->
Expand All @@ -33,6 +34,9 @@ <h2 id="auth-title" style="margin:0 0 8px; font-size:22px; font-weight:700;">Wel
Sign In
</button>

<div style="margin: 16px 0; text-align: center; color: #666; font-size: 14px;">OR</div>
<div id="google-signin-button" style="display:flex; justify-content:center; margin-bottom: 12px;"></div>

<div style="font-size:12px; color:#666; margin-top:10px; line-height:1.6;">
Password must contain:
<ul style="padding-left:18px; margin-top:6px;">
Expand Down Expand Up @@ -501,6 +505,9 @@ <h3 style="font-size:12px; font-weight:700; text-transform:uppercase; color:var(
}

localStorage.setItem('studyplan_user', JSON.stringify({ email: data.email }));
if (data.token) {
localStorage.setItem('studyplan_token', data.token);
}
document.getElementById('auth-modal').style.display = 'none';

} catch (err) {
Expand All @@ -509,6 +516,47 @@ <h3 style="font-size:12px; font-weight:700; text-transform:uppercase; color:var(
}
});

// Google OAuth Callback
async function handleCredentialResponse(response) {
const token = response.credential;
const errorEl = document.getElementById('auth-error');
errorEl.style.display = 'none';
try {
const res = await fetch('/api/auth/google', {
method: 'POST',
headers: { 'Content-Type': 'application/json' },
body: JSON.stringify({ token })
});
const data = await res.json();
if (!res.ok) {
errorEl.textContent = data.error || 'Google login failed';
errorEl.style.display = 'block';
return;
}
localStorage.setItem('studyplan_user', JSON.stringify({ email: data.email }));
if (data.token) {
localStorage.setItem('studyplan_token', data.token);
}
document.getElementById('auth-modal').style.display = 'none';
} catch(err) {
errorEl.textContent = 'Network error during Google sign-in';
errorEl.style.display = 'block';
}
}

window.onload = function () {
if (window.google) {
google.accounts.id.initialize({
client_id: 'YOUR_GOOGLE_CLIENT_ID_HERE',
callback: handleCredentialResponse
});
google.accounts.id.renderButton(
document.getElementById('google-signin-button'),
{ theme: 'outline', size: 'large', width: 300 }
);
}
};

// Check if already logged in
if (localStorage.getItem('studyplan_user')) {
document.getElementById('auth-modal').style.display = 'none';
Expand All @@ -518,6 +566,7 @@ <h3 style="font-size:12px; font-weight:700; text-transform:uppercase; color:var(
const logoutBtn = document.getElementById('logout-btn');
logoutBtn.addEventListener('click', () => {
localStorage.removeItem('studyplan_user');
localStorage.removeItem('studyplan_token');

// Show login modal again
document.getElementById('auth-modal').style.display = 'flex';
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72 changes: 69 additions & 3 deletions package-lock.json
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2 changes: 2 additions & 0 deletions package.json
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Expand Up @@ -15,6 +15,8 @@
"cors": "^2.8.6",
"dotenv": "^17.4.2",
"express": "^5.2.1",
"google-auth-library": "^10.7.0",
"jsonwebtoken": "^9.0.3",
"sqlite3": "^6.0.1"
},
"engines": {
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