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Monorepo for Aesthetic.Computer aesthetic.computer
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JavaScript
123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687// 🖼️ Open Graph Image Proxy// Re-serves third-party images with CORS headers so chat link previews// can load them onto a canvas (toBitmap needs an untainted canvas).
export const config = { path: "/api/og-image" };
const MAX_BYTES = 5 * 1024 * 1024; // 5 MBconst FETCH_TIMEOUT_MS = 8000;
const corsJson = (status, body) => new Response(JSON.stringify(body), { status, headers: { "Content-Type": "application/json", "Access-Control-Allow-Origin": "*", }, });
export default async function handler(req) { if (req.method === "OPTIONS") { return new Response(null, { status: 204, headers: { "Access-Control-Allow-Origin": "*", "Access-Control-Allow-Methods": "GET, OPTIONS", "Access-Control-Allow-Headers": "Content-Type", }, }); }
if (req.method !== "GET") return corsJson(405, { error: "Method not allowed" });
const targetUrl = new URL(req.url).searchParams.get("url"); if (!targetUrl) return corsJson(400, { error: "Missing 'url' parameter" });
let parsed; try { parsed = new URL(targetUrl); if (!["http:", "https:"].includes(parsed.protocol)) throw new Error("bad protocol"); } catch { return corsJson(400, { error: "Invalid URL" }); }
const controller = new AbortController(); const timeout = setTimeout(() => controller.abort(), FETCH_TIMEOUT_MS);
try { const upstream = await fetch(targetUrl, { headers: { "User-Agent": "Mozilla/5.0 (compatible; AestheticComputer/1.0)", Accept: "image/*,*/*;q=0.8", }, signal: controller.signal, redirect: "follow", }); clearTimeout(timeout);
if (!upstream.ok) return corsJson(502, { error: `HTTP ${upstream.status}` });
const contentType = upstream.headers.get("content-type") || "application/octet-stream"; if (!/^image\//i.test(contentType)) { return corsJson(415, { error: `Not an image: ${contentType}` }); }
const declaredLength = parseInt(upstream.headers.get("content-length") || "0", 10); if (declaredLength && declaredLength > MAX_BYTES) { return corsJson(413, { error: "Image too large" }); }
const buf = await upstream.arrayBuffer(); if (buf.byteLength > MAX_BYTES) return corsJson(413, { error: "Image too large" });
return new Response(buf, { status: 200, headers: { "Content-Type": contentType, "Access-Control-Allow-Origin": "*", "Cache-Control": "public, max-age=86400, immutable", }, }); } catch (err) { clearTimeout(timeout); const msg = err.name === "AbortError" ? "Request timed out" : err.message; return corsJson(500, { error: msg }); }}