illgitthat.github.io/src/index.ts at main · illgitthat/illgitthat.github.io · GitHub

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import {

GENERATED_SITE_CSP,

GALLERY_INDEX_KEY,

MAX_GALLERY_SIZE,

MODELS,

RATE_LIMIT_CONFIG,

SCREENSHOT_PREFIX,

SCREENSHOT_PROPAGATION_DELAY_MS,

SITE_TTL_SECONDS,

SYSTEM_PROMPTS,

} from './constants';

interface Env {

ASSETS: Fetcher;

ENVIRONMENT: string;

CEREBRAS_API_KEY: string;

CLOUDFLARE_ACCOUNT_ID?: string;

CLOUDFLARE_API_TOKEN?: string;

SITES: KVNamespace;

SCREENSHOTS: R2Bucket;

RATE_LIMIT: KVNamespace;

}

interface GalleryEntry {

siteId: string;

prompt: string;

createdAt: number;

screenshotUrl?: string;

}

function isAllowedOrigin(origin: string): boolean {

if (!origin) return true;

const isLocalDev = /^https?:\/\/(localhost|127\.0\.0\.1)(:\d+)?$/.test(origin);

// Match *.adamcbloom.com (with or without subdomain, http or https)

const isAllowedDomain = /^https?:\/\/(.*\.)?adamcbloom\.com$/.test(origin);

return isLocalDev || isAllowedDomain;

}

function getCorsHeaders(request: Request): Record<string, string> {

const origin = request.headers.get('Origin') || '';

if (origin && isAllowedOrigin(origin)) {

return {

'Access-Control-Allow-Origin': origin,

'Access-Control-Allow-Methods': 'GET, POST, OPTIONS',

'Access-Control-Allow-Headers': 'Content-Type',

'Access-Control-Allow-Credentials': 'true',

'Vary': 'Origin',

};

}

// No Origin header (non-browser or same-origin) or disallowed origin

return {

'Access-Control-Allow-Methods': 'GET, POST, OPTIONS',

'Access-Control-Allow-Headers': 'Content-Type',

};

}

// ============================================================================

// HELPERS

// ============================================================================

/**

* Create a JSON response with CORS headers

function jsonResponse(data: unknown, status = 200, extraHeaders: Record<string, string> = {}): Response {

return Response.json(data, {

status,

headers: { ...getSecurityHeaders(), ...extraHeaders },

});

}

/**

* Create a JSON response with request-specific CORS headers

function jsonResponseWithCors(request: Request, data: unknown, status = 200, extraHeaders: Record<string, string> = {}): Response {

return Response.json(data, {

status,

headers: { ...getCorsHeaders(request), ...getSecurityHeaders(), ...extraHeaders },

});

}

function getSecurityHeaders(): Record<string, string> {

return {

'Strict-Transport-Security': 'max-age=31536000; includeSubDomains; preload',

'Referrer-Policy': 'no-referrer',

'Permissions-Policy': 'camera=(), microphone=(), geolocation=(), payment=(), usb=()',

'X-Content-Type-Options': 'nosniff',

};

}

// ============================================================================

// STRUCTURED LOGGING

// ============================================================================

type LogLevel = 'debug' | 'info' | 'warn' | 'error';

interface LogContext {

[key: string]: unknown;

}

const logger = {

_format(level: LogLevel, component: string, message: string, context?: LogContext): string {

const timestamp = new Date().toISOString();

const contextStr = context ? ` ${JSON.stringify(context)}` : '';

return `[${timestamp}] [${level.toUpperCase()}] [${component}] ${message}${contextStr}`;

debug(component: string, message: string, context?: LogContext): void {

console.log(this._format('debug', component, message, context));

info(component: string, message: string, context?: LogContext): void {

console.log(this._format('info', component, message, context));

warn(component: string, message: string, context?: LogContext): void {

console.warn(this._format('warn', component, message, context));

error(component: string, message: string, context?: LogContext): void {

console.error(this._format('error', component, message, context));

};

// ============================================================================

// RATE LIMITING

// ============================================================================

interface RateLimitResult {

allowed: boolean;

remaining: number;

resetAt: number;

}

function getRateLimitHeaders(rateLimit: RateLimitResult): Record<string, string> {

return {

'X-RateLimit-Limit': String(RATE_LIMIT_CONFIG.MAX_REQUESTS),

'X-RateLimit-Remaining': String(Math.max(0, rateLimit.remaining)),

'X-RateLimit-Reset': String(rateLimit.resetAt),

};

}

/**

* Check and increment rate limit for an IP address

* Uses KV with TTL for automatic expiration

async function checkRateLimit(env: Env, ip: string): Promise<RateLimitResult> {

if (!env.RATE_LIMIT) {

// Rate limiting not configured, allow all requests

return { allowed: true, remaining: RATE_LIMIT_CONFIG.MAX_REQUESTS, resetAt: 0 };

}

const key = `${RATE_LIMIT_CONFIG.KEY_PREFIX}${ip}`;

const now = Math.floor(Date.now() / 1000);

try {

const data = await env.RATE_LIMIT.get(key);

let count = 0;

let windowStart = now;

if (data) {

const parsed = JSON.parse(data) as { count: number; windowStart: number };

// Check if we're still in the same window

if (now - parsed.windowStart < RATE_LIMIT_CONFIG.WINDOW_SECONDS) {

count = parsed.count;

windowStart = parsed.windowStart;

}

const resetAt = windowStart + RATE_LIMIT_CONFIG.WINDOW_SECONDS;

const remaining = Math.max(0, RATE_LIMIT_CONFIG.MAX_REQUESTS - count - 1);

if (count >= RATE_LIMIT_CONFIG.MAX_REQUESTS) {

logger.warn('RateLimit', 'Rate limit exceeded', { ip: ip.slice(0, 10) + '...', count });

return { allowed: false, remaining: 0, resetAt };

}

// Increment counter

await env.RATE_LIMIT.put(

key,

JSON.stringify({ count: count + 1, windowStart }),

{ expirationTtl: RATE_LIMIT_CONFIG.WINDOW_SECONDS }

);

return { allowed: true, remaining, resetAt };

} catch (error) {

// On error, allow the request but log the issue

logger.error('RateLimit', 'Failed to check rate limit', {

error: error instanceof Error ? error.message : 'Unknown'

});

return { allowed: true, remaining: RATE_LIMIT_CONFIG.MAX_REQUESTS, resetAt: 0 };

}

export default {

async fetch(request: Request, env: Env, ctx: ExecutionContext): Promise<Response> {

const url = new URL(request.url);

const origin = request.headers.get('Origin') || '';

const isApiRequest = url.pathname.startsWith('/api/');

if (origin && !isAllowedOrigin(origin) && (isApiRequest || request.method === 'OPTIONS')) {

return new Response('Forbidden', {

status: 403,

headers: getSecurityHeaders(),

});

}

if (request.method === 'OPTIONS') {

return new Response(null, { headers: { ...getCorsHeaders(request), ...getSecurityHeaders() } });

}

// Serve stored sites at /site/:id

const siteMatch = url.pathname.match(/^\/site\/([a-zA-Z0-9]+)$/);

if (siteMatch) {

return handleSiteView(siteMatch[1], env);

}

const screenshotMatch = url.pathname.match(/^\/screenshot\/([a-zA-Z0-9\-_.]+)$/);

if (screenshotMatch) {

return handleScreenshotView(screenshotMatch[1], env);

}

if (url.pathname.startsWith('/api/')) {

return handleApi(request, env, url, ctx);

}

return env.ASSETS.fetch(request);

};

async function handleApi(

request: Request,

env: Env,

url: URL,

ctx: ExecutionContext

): Promise<Response> {

if (url.pathname === '/api/health') {

return jsonResponseWithCors(request, { status: 'ok' });

}

if (url.pathname === '/api/build' && request.method === 'POST') {

return handleBuild(request, env, ctx);

}

if (url.pathname === '/api/build-stream' && request.method === 'POST') {

return handleBuildStream(request, env, ctx);

}

if (url.pathname === '/api/surprise' && request.method === 'POST') {

return handleSurprise(request, env);

}

if (url.pathname === '/api/gallery' && request.method === 'GET') {

return handleGallery(request, env);

}

const screenshotStatusMatch = url.pathname.match(/^\/api\/screenshot-status\/([a-zA-Z0-9]+)$/);

if (screenshotStatusMatch && request.method === 'GET') {

return handleScreenshotStatus(request, screenshotStatusMatch[1], env);

}

return jsonResponseWithCors(request, { error: 'Not found' }, 404);

}

async function handleBuild(request: Request, env: Env, ctx: ExecutionContext): Promise<Response> {

// Rate limiting check

const clientIp = request.headers.get('CF-Connecting-IP') || 'unknown';

const rateLimit = await checkRateLimit(env, clientIp);

const rateLimitHeaders = getRateLimitHeaders(rateLimit);

if (!rateLimit.allowed) {

return jsonResponseWithCors(

request,

{

error: 'Rate limit exceeded. Please wait before making more requests.',

retryAfter: rateLimit.resetAt - Math.floor(Date.now() / 1000)

429,

{

'Retry-After': String(rateLimit.resetAt - Math.floor(Date.now() / 1000)),

...rateLimitHeaders,

}

);

}

let body: { prompt?: string };

try {

body = (await request.json()) as { prompt?: string };

} catch {

return jsonResponseWithCors(request, { error: 'Invalid JSON body' }, 400, rateLimitHeaders);

}

const prompt = body.prompt?.trim();

if (!prompt) {

return jsonResponseWithCors(request, { error: 'Prompt required' }, 400, rateLimitHeaders);

}

if (prompt.length > 2000) {

return jsonResponseWithCors(request, { error: 'Prompt too long' }, 400, rateLimitHeaders);

}

const messages = [

{ role: 'system', content: SYSTEM_PROMPTS.BUILD },

{

role: 'user',

content: `Brief: ${prompt}\n\nProduce the final HTML document now.`,

];

let html = '';

try {

logger.info('Build', 'Starting generation', { promptPreview: prompt.slice(0, 100) });

const jsonText = await callCerebras(env, messages, {

model: MODELS.BUILD,

maxTokens: 16000,

});

const parsed = parseHtmlResponse(jsonText);

html = parsed;

logger.info('Build', 'Generated HTML', { length: html.length });

} catch (error) {

const errorMessage = error instanceof Error ? error.message : 'Unknown error';

logger.error('Build', 'Generation failed', { error: errorMessage });

// Detect rate limiting or server overload

const isRateLimit = errorMessage.includes('429') || errorMessage.toLowerCase().includes('rate');

const isServerBusy = errorMessage.includes('503') || errorMessage.includes('502') || errorMessage.toLowerCase().includes('busy');

let userMessage = 'AI service error';

if (isRateLimit) {

userMessage = 'The builder is busy. Please try again in a moment.';

} else if (isServerBusy) {

userMessage = 'The AI service is temporarily unavailable. Please try again shortly.';

}

return jsonResponseWithCors(request, { error: userMessage }, 502, rateLimitHeaders);

}

html = html.trim();

if (!html) {

logger.error('Build', 'Empty response from AI - raw content was empty after parsing');

return jsonResponseWithCors(request, { error: 'Empty response from AI. Please try again.' }, 502, rateLimitHeaders);

}

const normalizedHtml = normalizeHtml(html);

// Store in KV with 24h TTL and return shareable URL

const siteId = generateSiteId();

try {

await env.SITES.put(siteId, normalizedHtml, { expirationTtl: SITE_TTL_SECONDS });

// Store prompt separately for regeneration on expiry (store longer than site)

await env.SITES.put(`prompt:${siteId}`, prompt, { expirationTtl: SITE_TTL_SECONDS * 7 }); // 7 days

// Add to gallery index

await addToGalleryIndex(env, {

siteId,

prompt,

createdAt: Date.now()

});

} catch {

// KV storage failed, still return the HTML but without share URL

return jsonResponseWithCors(request, { html: normalizedHtml }, 200, rateLimitHeaders);

}

const shareUrl = `/site/${siteId}`;

const origin = new URL(request.url).origin;

ctx.waitUntil(

generateScreenshotAndStore({

env,

siteId,

origin,

})

);

return jsonResponseWithCors(request, { html: normalizedHtml, shareUrl, siteId }, 200, rateLimitHeaders);

}

/**

* Stream-based build endpoint using Server-Sent Events

* Provides real-time progress updates during site generation

async function handleBuildStream(request: Request, env: Env, ctx: ExecutionContext): Promise<Response> {

// Rate limiting check

const clientIp = request.headers.get('CF-Connecting-IP') || 'unknown';

const rateLimit = await checkRateLimit(env, clientIp);

const rateLimitHeaders = getRateLimitHeaders(rateLimit);

if (!rateLimit.allowed) {

return jsonResponseWithCors(

request,

{

error: 'Rate limit exceeded. Please wait before making more requests.',

retryAfter: rateLimit.resetAt - Math.floor(Date.now() / 1000)

429,

{

'Retry-After': String(rateLimit.resetAt - Math.floor(Date.now() / 1000)),

...rateLimitHeaders,

}

);

}

let body: { prompt?: string };

try {

body = (await request.json()) as { prompt?: string };

} catch {

return jsonResponseWithCors(request, { error: 'Invalid JSON body' }, 400, rateLimitHeaders);

}

const prompt = body.prompt?.trim();

if (!prompt) {

return jsonResponseWithCors(request, { error: 'Prompt required' }, 400, rateLimitHeaders);

}

if (prompt.length > 2000) {

return jsonResponseWithCors(request, { error: 'Prompt too long' }, 400, rateLimitHeaders);

}

// Create a TransformStream for SSE

const { readable, writable } = new TransformStream();

const writer = writable.getWriter();

const encoder = new TextEncoder();

// Helper to send SSE events

const sendEvent = async (event: string, data: unknown) => {

const message = `event: ${event}\ndata: ${JSON.stringify(data)}\n\n`;

await writer.write(encoder.encode(message));

};

// Start the generation process in the background

ctx.waitUntil((async () => {

try {

// Send initial progress

await sendEvent('progress', {

stage: 'started',

message: 'Starting generation...',

estimatedTime: 15 // seconds

});

const messages = [

{ role: 'system', content: SYSTEM_PROMPTS.BUILD },

{ role: 'user', content: `Brief: ${prompt}\n\nProduce the final HTML document now.` },

];

await sendEvent('progress', {

stage: 'generating',

message: 'AI is generating your site...',

progress: 20

});

logger.info('BuildStream', 'Starting generation', { promptPreview: prompt.slice(0, 100) });

const jsonText = await callCerebras(env, messages, {

model: MODELS.BUILD,

maxTokens: 16000,

});

await sendEvent('progress', {

stage: 'processing',

message: 'Processing generated content...',

progress: 70

});

const parsed = parseHtmlResponse(jsonText);

let html = parsed.trim();

if (!html) {

await sendEvent('error', { error: 'Empty response from AI. Please try again.' });

await writer.close();

return;

}

const normalizedHtml = normalizeHtml(html);

await sendEvent('progress', {

stage: 'storing',

message: 'Storing your site...',

progress: 85

});

// Store in KV

const siteId = generateSiteId();

await env.SITES.put(siteId, normalizedHtml, { expirationTtl: SITE_TTL_SECONDS });

await env.SITES.put(`prompt:${siteId}`, prompt, { expirationTtl: SITE_TTL_SECONDS * 7 });

await addToGalleryIndex(env, {

siteId,

prompt,

createdAt: Date.now()

});

const shareUrl = `/site/${siteId}`;

const origin = new URL(request.url).origin;

// Start screenshot generation in background

ctx.waitUntil(generateScreenshotAndStore({ env, siteId, origin }));

await sendEvent('progress', {

stage: 'complete',

message: 'Site ready!',

progress: 100

});

// Send final result

await sendEvent('complete', {

html: normalizedHtml,

shareUrl,

siteId

});

} catch (error) {

const errorMessage = error instanceof Error ? error.message : 'Unknown error';

logger.error('BuildStream', 'Generation failed', { error: errorMessage });

const isRateLimit = errorMessage.includes('429') || errorMessage.toLowerCase().includes('rate');

const isServerBusy = errorMessage.includes('503') || errorMessage.includes('502');

let userMessage = 'AI service error';

if (isRateLimit) {

userMessage = 'The builder is busy. Please try again in a moment.';

} else if (isServerBusy) {

userMessage = 'The AI service is temporarily unavailable. Please try again shortly.';

}

await sendEvent('error', { error: userMessage });

} finally {

await writer.close();

}

})());

// Return the SSE response immediately

return new Response(readable, {

headers: {

'Content-Type': 'text/event-stream',

'Cache-Control': 'no-cache',

'Connection': 'keep-alive',

...getCorsHeaders(request),

...getSecurityHeaders(),

...rateLimitHeaders,

});

}

async function handleSurprise(request: Request, env: Env): Promise<Response> {

// Rate limiting check (shares limit with build)

const clientIp = request.headers.get('CF-Connecting-IP') || 'unknown';

const rateLimit = await checkRateLimit(env, clientIp);

const rateLimitHeaders = getRateLimitHeaders(rateLimit);

if (!rateLimit.allowed) {

return jsonResponseWithCors(

request,

{

error: 'Rate limit exceeded. Please wait before making more requests.',

retryAfter: rateLimit.resetAt - Math.floor(Date.now() / 1000)

429,

{

'Retry-After': String(rateLimit.resetAt - Math.floor(Date.now() / 1000)),

...rateLimitHeaders,

}

);

}

const messages = [

{ role: 'system', content: SYSTEM_PROMPTS.SURPRISE },

{ role: 'user', content: 'Generate a fresh, creative website idea for me to build right now.' },

];

try {

const idea = await callCerebras(env, messages, {

model: MODELS.SURPRISE,

maxTokens: 400,

temperature: 1.2,

});

return jsonResponseWithCors(request, { idea: idea.trim() }, 200, rateLimitHeaders);

} catch (error) {

const errorMessage = error instanceof Error ? error.message : 'Unknown error';

logger.error('Surprise', 'Generation failed', { error: errorMessage });

return jsonResponseWithCors(request, { error: 'Could not generate idea. Try again!' }, 502, rateLimitHeaders);

}

async function handleSiteView(siteId: string, env: Env): Promise<Response> {

const html = await env.SITES.get(siteId);

if (!html) {

// Check if we have the original prompt stored for regeneration

const storedPrompt = await env.SITES.get(`prompt:${siteId}`);

const encodedPrompt = storedPrompt ? encodeURIComponent(storedPrompt) : '';

const expiredHtml = `<!DOCTYPE html>

<html>

<head>

<title>Site Expired</title>

<style>

body {

font-family: system-ui, -apple-system, sans-serif;

background: #0b0d24;

color: #e5e7eb;

display: flex;

align-items: center;

justify-content: center;

min-height: 100vh;

margin: 0;

text-align: center;

}

.container {

max-width: 450px;

padding: 2rem;

}

h1 {

margin-bottom: 1rem;

font-size: 1.5rem;

}

p {

margin-bottom: 1rem;

opacity: 0.8;

}

.prompt-preview {

background: rgba(255,255,255,0.1);

padding: 1rem;

border-radius: 8px;

margin: 1.5rem 0;

font-size: 0.9rem;

text-align: left;

}

.prompt-preview strong {

display: block;

margin-bottom: 0.5rem;

opacity: 0.7;

}

a {

color: #74b0ff;

text-decoration: none;

}

a:hover {

text-decoration: underline;

}

.btn {

display: inline-block;

background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);

color: white;

padding: 0.75rem 1.5rem;

border-radius: 8px;

text-decoration: none;

margin-top: 0.5rem;

}

.btn:hover {

opacity: 0.9;

text-decoration: none;

}

</style>

</head>

<body>

<h1>This site has expired</h1>

<p>Generated sites are removed after newer creations.</p>

${storedPrompt ? `

<strong>Original prompt:</strong>

${escapeHtml(storedPrompt.slice(0, 200))}${storedPrompt.length > 200 ? '...' : ''}

</div>

<a href="/?prompt=${encodedPrompt}" class="btn">Regenerate with same prompt →</a>

<p style="margin-top: 1.5rem;"><a href="/">Or create something new</a></p>

` : `

<p><a href="/">Create a new one →</a></p>

</div>

</body>

</html>`;

return new Response(expiredHtml, {

status: 404,

headers: {

'Content-Type': 'text/html; charset=utf-8',

...getSecurityHeaders(),

});

}

return new Response(html, {

headers: {

'Content-Type': 'text/html; charset=utf-8',

'Content-Security-Policy': GENERATED_SITE_CSP,

'X-Frame-Options': 'SAMEORIGIN',

...getSecurityHeaders(),

}

});

}

async function handleScreenshotView(key: string, env: Env): Promise<Response> {

const object = await env.SCREENSHOTS.get(`${SCREENSHOT_PREFIX}${key}`);

if (!object) {

return new Response('Not found', { status: 404 });

}

const headers = new Headers();

headers.set('Content-Type', object.httpMetadata?.contentType || 'image/png');

headers.set('Cache-Control', 'public, max-age=2592000, immutable'); // 30 days, immutable content

Object.entries(getSecurityHeaders()).forEach(([keyName, value]) => headers.set(keyName, value));

return new Response(object.body, { headers });

}

async function handleScreenshotStatus(request: Request, siteId: string, env: Env): Promise<Response> {

try {

// Check if R2 bucket is available (might not be in dev mode)

if (!env.SCREENSHOTS) {

logger.info('ScreenshotStatus', 'R2 bucket not available');

return jsonResponseWithCors(request, { ready: false, reason: 'storage_unavailable' });

}

const screenshotKey = `${SCREENSHOT_PREFIX}${siteId}.png`;

const object = await env.SCREENSHOTS.head(screenshotKey);

if (object) {

logger.info('ScreenshotStatus', 'Found screenshot', { siteId });

return jsonResponseWithCors(request, { ready: true, screenshotUrl: `/screenshot/${siteId}.png` });

}

logger.debug('ScreenshotStatus', 'Screenshot not ready', { siteId });

return jsonResponseWithCors(request, { ready: false });

} catch (error) {

const message = error instanceof Error ? error.message : 'Unknown';

logger.error('ScreenshotStatus', 'Error checking status', { siteId, error: message });

return jsonResponseWithCors(request, { ready: false, error: 'Screenshot status unavailable' });

}

async function handleGallery(request: Request, env: Env): Promise<Response> {

try {

const indexJson = await env.SITES.get(GALLERY_INDEX_KEY);

if (!indexJson) {

return jsonResponseWithCors(request, { sites: [] }, 200, { 'Cache-Control': 'public, max-age=60' });

}

const entries: GalleryEntry[] = JSON.parse(indexJson);

// Verify sites still exist (in parallel)

const checks = await Promise.all(

entries.map(async entry => {

const exists = (await env.SITES.get(entry.siteId)) !== null;

return exists ? entry : null;

})

);

const sites = checks.filter((e): e is GalleryEntry => e !== null);

return jsonResponseWithCors(request, { sites }, 200, { 'Cache-Control': 'public, max-age=60' });

} catch {

return jsonResponseWithCors(request, { sites: [] }, 200, { 'Cache-Control': 'public, max-age=60' });

}

async function addToGalleryIndex(env: Env, entry: GalleryEntry): Promise<void> {

try {

const indexJson = await env.SITES.get(GALLERY_INDEX_KEY);

let entries: GalleryEntry[] = indexJson ? JSON.parse(indexJson) : [];

// Add new entry at the beginning

entries.unshift(entry);

// Identify entries to remove (beyond MAX_GALLERY_SIZE)

const entriesToRemove = entries.slice(MAX_GALLERY_SIZE);

// Keep only the most recent entries

entries = entries.slice(0, MAX_GALLERY_SIZE);

// Store index (with long TTL as fallback)

await env.SITES.put(GALLERY_INDEX_KEY, JSON.stringify(entries), {

expirationTtl: SITE_TTL_SECONDS

});

// Clean up old entries (KV sites, prompts, and R2 screenshots)

for (const old of entriesToRemove) {

try {

await Promise.all([

env.SITES.delete(old.siteId),

env.SITES.delete(`prompt:${old.siteId}`),

env.SCREENSHOTS?.delete(`${SCREENSHOT_PREFIX}${old.siteId}.png`),

]);

logger.info('Gallery', 'Cleaned up old entry', { siteId: old.siteId });

} catch {

// Best effort cleanup

}

} catch {

// Silently fail - gallery is non-critical

}

async function updateGalleryScreenshot(env: Env, siteId: string, screenshotUrl: string): Promise<void> {

try {

const indexJson = await env.SITES.get(GALLERY_INDEX_KEY);

if (!indexJson) {

logger.info('Gallery', 'No index found when updating screenshot');

return;

}

const entries: GalleryEntry[] = JSON.parse(indexJson);

const updated = entries.map(entry =>

entry.siteId === siteId ? { ...entry, screenshotUrl } : entry

);

await env.SITES.put(GALLERY_INDEX_KEY, JSON.stringify(updated), {

expirationTtl: SITE_TTL_SECONDS

});

logger.info('Gallery', 'Updated screenshot URL', { siteId });

} catch (error) {

const message = error instanceof Error ? error.message : 'Unknown';

logger.error('Gallery', 'Failed to update screenshot URL', { error: message });

}

/**

* Attempt to take a screenshot with retry logic and exponential backoff

async function takeScreenshotWithRetry(

apiUrl: string,

targetUrl: string,

apiToken: string,

maxRetries = 3

): Promise<ArrayBuffer | null> {

const baseDelayMs = 1000; // 1 second base delay

for (let attempt = 1; attempt <= maxRetries; attempt++) {

try {

logger.info('Screenshot', `Attempt ${attempt}/${maxRetries}`, { url: targetUrl });

const response = await fetch(apiUrl, {

method: 'POST',

headers: {

'Content-Type': 'application/json',

'Authorization': `Bearer ${apiToken}`,

body: JSON.stringify({

url: targetUrl,

viewport: { width: 720, height: 450 }, // Optimized for gallery display (360x225 @ 2x)

screenshotOptions: { fullPage: false },

gotoOptions: {

waitUntil: 'networkidle0', // Wait until no network connections for 500ms

waitForTimeout: 300, // Additional .3s wait for animations/renders to settle

}),

});

if (response.ok) {

const imageBuffer = await response.arrayBuffer();

return imageBuffer;

}

const errorText = await safeResponseText(response);

logger.warn('Screenshot', `Attempt ${attempt} failed`, {

status: response.status,

error: errorText.slice(0, 200)

});

// Don't retry on client errors (4xx), only on server errors (5xx)

if (response.status < 500) {

logger.error('Screenshot', 'Non-retryable error', { status: response.status });

return null;

}

} catch (error) {

const message = error instanceof Error ? error.message : 'Unknown error';

logger.warn('Screenshot', `Attempt ${attempt} threw error`, { error: message });

}

// Exponential backoff: 1s, 2s, 4s

if (attempt < maxRetries) {

const delay = baseDelayMs * Math.pow(2, attempt - 1);

logger.info('Screenshot', `Retrying in ${delay}ms`);

await new Promise(resolve => setTimeout(resolve, delay));

}

logger.error('Screenshot', 'All retry attempts exhausted');

return null;

}

async function generateScreenshotAndStore(params: {

env: Env;

siteId: string;

origin: string;

}): Promise<void> {

const { env, siteId, origin } = params;

// Skip screenshot generation in dev mode (Browser Rendering can't access localhost)

if (origin.includes('localhost') || origin.includes('127.0.0.1')) {

logger.info('Screenshot', 'Skipping - localhost not accessible by Browser Rendering API');

return;

}

if (!env.CLOUDFLARE_ACCOUNT_ID || !env.CLOUDFLARE_API_TOKEN) {

logger.warn('Screenshot', 'Missing Cloudflare Browser Rendering credentials');

return;

}

// Small delay to ensure KV write has propagated

await new Promise(resolve => setTimeout(resolve, SCREENSHOT_PROPAGATION_DELAY_MS));

// Verify site exists before taking screenshot

const siteHtml = await env.SITES.get(siteId);

if (!siteHtml) {

logger.error('Screenshot', 'Site not found in KV, skipping screenshot', { siteId });

return;

}

const apiUrl = `https://api.cloudflare.com/client/v4/accounts/${env.CLOUDFLARE_ACCOUNT_ID}/browser-rendering/screenshot`;

const url = `${origin}/site/${siteId}`;

const imageBuffer = await takeScreenshotWithRetry(apiUrl, url, env.CLOUDFLARE_API_TOKEN);

if (!imageBuffer) {

logger.error('Screenshot', 'Failed to capture screenshot after retries', { siteId });

return;

}

try {

const screenshotKey = `${SCREENSHOT_PREFIX}${siteId}.png`;

logger.info('Screenshot', 'Storing screenshot', { siteId, size: imageBuffer.byteLength });

await env.SCREENSHOTS.put(screenshotKey, imageBuffer, {

httpMetadata: { contentType: 'image/png' },

});

logger.info('Screenshot', 'Successfully stored screenshot', { siteId });

await updateGalleryScreenshot(env, siteId, `/screenshot/${siteId}.png`);

} catch (error) {

const message = error instanceof Error ? error.message : 'Unknown error';

logger.error('Screenshot', 'Failed to store screenshot', { error: message });

}

function generateSiteId(): string {

return crypto.randomUUID().replace(/-/g, '').slice(0, 8);

}

/**

* Sanitize HTML to prevent XSS attacks

* Removes dangerous patterns while preserving safe inline scripts/styles

function sanitizeHtml(html: string): string {

let sanitized = html;

// Remove dangerous event handlers (onclick, onerror, onload, etc.)

sanitized = sanitized.replace(/\s+on\w+\s*=\s*["'][^"']*["']/gi, '');

sanitized = sanitized.replace(/\s+on\w+\s*=\s*[^\s>]+/gi, '');

// Remove javascript: URLs

sanitized = sanitized.replace(/href\s*=\s*["']javascript:[^"']*["']/gi, 'href="#"');

sanitized = sanitized.replace(/src\s*=\s*["']javascript:[^"']*["']/gi, '');

// Remove data: URLs in src attributes (potential XSS vector, except for images)

sanitized = sanitized.replace(/src\s*=\s*["']data:(?!image\/)[^"']*["']/gi, '');

// Remove external scripts (keep inline scripts only)

sanitized = sanitized.replace(/<script[^>]+src\s*=\s*["'][^"']+["'][^>]*>[\s\S]*?<\/script>/gi, '');

// Remove iframes

sanitized = sanitized.replace(/<iframe[^>]*>[\s\S]*?<\/iframe>/gi, '');

// Remove object/embed tags

sanitized = sanitized.replace(/<object[^>]*>[\s\S]*?<\/object>/gi, '');

sanitized = sanitized.replace(/<embed[^>]*>/gi, '');

// Remove base tags (could redirect relative URLs)

sanitized = sanitized.replace(/<base[^>]*>/gi, '');

// Remove meta refresh

sanitized = sanitized.replace(/<meta[^>]*http-equiv\s*=\s*["']?refresh["']?[^>]*>/gi, '');

return sanitized;

}

function normalizeHtml(html: string): string {

// First sanitize, then normalize

const sanitized = sanitizeHtml(html);

const hasDoc = /<!doctype html>/i.test(sanitized);

if (hasDoc) return sanitized;

return `<!DOCTYPE html>\n<html lang=\"en\">\n<head>\n<meta charset=\"UTF-8\">\n<meta name=\"viewport\" content=\"width=device-width, initial-scale=1\">\n<title>Generated Site</title>\n</head>\n<body>\n${sanitized}\n</body>\n</html>`;

}

/**

* Escape HTML special characters to prevent XSS in dynamic content

function escapeHtml(text: string): string {

const htmlEscapes: Record<string, string> = {

'&': '&',

'<': '<',

'>': '>',

'"': '"',

"'": ''',

};

return text.replace(/[&<>"']/g, char => htmlEscapes[char] || char);

}

async function safeResponseText(response: Response): Promise<string> {

try {

return await response.text();

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