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Authentication module for Universal Model Trainer
Provides password-based authentication with session management
SIMPLIFIED VERSION - No middleware, direct session checks
"""
from fastapi import HTTPException, Request, status, Depends
from starlette.middleware.sessions import SessionMiddleware
from starlette.responses import JSONResponse, HTMLResponse
import secrets
from typing import Optional
from app.config import settings
def setup_auth(app) -> None:
"""Add session middleware to the FastAPI app"""
app.add_middleware(
SessionMiddleware,
secret_key=settings.SESSION_SECRET_KEY,
session_cookie="trainer_session",
max_age=settings.SESSION_EXPIRE_HOURS * 3600,
same_site="lax",
https_only=False # Set to True in production with HTTPS
)
def verify_password(password: str) -> bool:
"""Verify password against env variable using constant-time comparison"""
if not settings.APP_PASSWORD:
return True # No password configured
return secrets.compare_digest(password, settings.APP_PASSWORD)
def is_auth_enabled() -> bool:
"""Check if authentication is enabled"""
return bool(settings.APP_PASSWORD)
def get_current_user(request: Request) -> Optional[dict]:
"""Get current user from session if authenticated"""
if not settings.APP_PASSWORD:
return {"authenticated": True, "username": "anonymous"}
user = request.session.get("user")
if user and user.get("authenticated"):
return user
return None
async def require_auth(request: Request) -> dict:
"""Dependency that requires authentication - returns user or raises 401"""
if not settings.APP_PASSWORD:
return {"authenticated": True, "username": "anonymous"}
user = get_current_user(request)
if not user:
raise HTTPException(
status_code=status.HTTP_401_UNAUTHORIZED,
detail="Authentication required",
headers={"WWW-Authenticate": "Session"}
)
return user
def is_authenticated(request: Request) -> bool:
"""Check if request is authenticated (helper for templates)"""
if not settings.APP_PASSWORD:
return True
user = request.session.get("user")
return bool(user and user.get("authenticated"))
def get_login_html(error: str = None) -> str:
"""Generate the login page HTML"""
error_display = f'<div class="error-msg text-center" style="display:block;">{error}</div>' if error else '<div class="error-msg text-center" id="errorMsg">Invalid password</div>'
return f'''<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Universal Model Trainer - Login</title>
<link href="https://cdn.jsdelivr.net/npm/bootstrap@5.3.0/dist/css/bootstrap.min.css" rel="stylesheet">
<style>
body {{
background: linear-gradient(135deg, #1a1a2e 0%, #16213e 100%);
min-height: 100vh;
display: flex;
align-items: center;
justify-content: center;
font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
}}
.login-container {{
max-width: 500px;
width: 100%;
padding: 20px;
}}
.login-card {{
background: rgba(255,255,255,0.05);
border: 1px solid rgba(255,255,255,0.1);
border-radius: 20px;
padding: 50px 40px;
backdrop-filter: blur(10px);
box-shadow: 0 20px 40px rgba(0,0,0,0.3);
}}
.login-card h1 {{
color: #fff;
margin-bottom: 10px;
font-weight: 600;
font-size: 1.8rem;
}}
.login-card .subtitle {{
color: rgba(255,255,255,0.6);
margin-bottom: 35px;
font-size: 0.95rem;
}}
.login-icon {{
font-size: 3rem;
margin-bottom: 20px;
display: block;
text-align: center;
}}
.form-control {{
background: rgba(255,255,255,0.1);
border: 1px solid rgba(255,255,255,0.2);
color: #fff;
padding: 15px 20px;
font-size: 1rem;
border-radius: 12px;
}}
.form-control::placeholder {{
color: rgba(255,255,255,0.5);
}}
.form-control:focus {{
background: rgba(255,255,255,0.15);
border-color: #4f46e5;
color: #fff;
box-shadow: 0 0 0 3px rgba(79,70,229,0.25);
}}
.btn-login {{
background: linear-gradient(135deg, #4f46e5 0%, #7c3aed 100%);
border: none;
padding: 15px;
font-weight: 600;
font-size: 1rem;
border-radius: 12px;
width: 100%;
margin-top: 10px;
transition: all 0.3s ease;
}}
.btn-login:hover {{
background: linear-gradient(135deg, #4338ca 0%, #6d28d9 100%);
transform: translateY(-2px);
box-shadow: 0 5px 20px rgba(79,70,229,0.4);
}}
.error-msg {{
color: #ef4444;
margin-top: 15px;
font-size: 0.9rem;
}}
.footer-text {{
color: rgba(255,255,255,0.4);
font-size: 0.8rem;
margin-top: 30px;
text-align: center;
}}
</style>
</head>
<body>
<div class="login-container">
<div class="login-card">
<div class="login-icon">🔐</div>
<h1 class="text-center">Universal Model Trainer</h1>
<p class="subtitle text-center">Enter your password to access the training dashboard</p>
<form id="loginForm">
<div class="mb-3">
<input
type="password"
class="form-control"
id="password"
placeholder="Enter password"
required
autofocus
autocomplete="current-password"
>
</div>
<button type="submit" class="btn btn-primary btn-login">
<span id="btnText">Access Dashboard</span>
<span id="btnLoader" class="spinner-border spinner-border-sm" role="status" style="display:none;"></span>
</button>
{error_display}
</form>
<p class="footer-text">
Powered by HuggingFace 🤗 | Secure Session Authentication
</p>
</div>
</div>
<script>
document.getElementById('loginForm').addEventListener('submit', async (e) => {{
e.preventDefault();
const password = document.getElementById('password').value;
const errorMsg = document.getElementById('errorMsg');
const btnText = document.getElementById('btnText');
const btnLoader = document.getElementById('btnLoader');
const submitBtn = e.target.querySelector('button[type="submit"]');
// Reset error state
errorMsg.style.display = 'none';
// Show loading state
btnText.textContent = 'Authenticating...';
btnLoader.style.display = 'inline-block';
submitBtn.disabled = true;
try {{
const formData = new FormData();
formData.append('password', password);
const response = await fetch('/api/auth/login', {{
method: 'POST',
body: formData,
credentials: 'same-origin'
}});
const data = await response.json();
if (response.ok && data.success) {{
btnText.textContent = 'Success!';
// Wait for cookie to be fully set, then redirect
setTimeout(() => {{
window.location.replace('/');
}}, 200);
}} else {{
throw new Error(data.detail || 'Authentication failed');
}}
}} catch (error) {{
errorMsg.textContent = 'Invalid password. Please try again.';
errorMsg.style.display = 'block';
btnText.textContent = 'Access Dashboard';
btnLoader.style.display = 'none';
submitBtn.disabled = false;
document.getElementById('password').select();
}}
}});
// Focus password field
document.getElementById('password').focus();
</script>
</body>
</html>'''
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