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| /**
* NetEase Music CORS proxy for Alibaba Cloud ESA Edge Functions.
*
* Add-on configuration:
* https://YOUR_DOMAIN/?url={url}
*
* Security model:
* - HTTPS only
* - music.163.com only
* - /api/* only
* - GET, HEAD and OPTIONS only
* - Never forwards the caller's cookies or authorization headers
*/
const ALLOWED_HOSTS = new Set(["music.163.com"]);
const ALLOWED_PATH_PREFIXES = ["/api/"];
const MAX_TARGET_URL_LENGTH = 4096;
function corsHeaders() {
return {
"Access-Control-Allow-Origin": "*",
"Access-Control-Allow-Methods": "GET, HEAD, OPTIONS",
"Access-Control-Allow-Headers":
"Accept, Accept-Language, Content-Type, Origin, X-Requested-With",
"Access-Control-Expose-Headers":
"Content-Type, Content-Length, Date, ETag, Last-Modified",
"Access-Control-Max-Age": "86400",
"X-Content-Type-Options": "nosniff",
};
}
function jsonResponse(data, status = 200) {
const headers = new Headers(corsHeaders());
headers.set("Content-Type", "application/json; charset=utf-8");
headers.set("Cache-Control", "no-store");
return new Response(JSON.stringify(data), {
status,
headers,
});
}
function parseTarget(requestUrl) {
const proxyUrl = new URL(requestUrl);
let rawTarget = proxyUrl.searchParams.get("url");
if (!rawTarget) {
return { error: "Missing query parameter: url", status: 400 };
}
rawTarget = rawTarget.trim();
// URLSearchParams normally decodes the value once. This extra pass also
// accepts clients that encode the target URL twice.
if (!/^https?:\/\//i.test(rawTarget)) {
try {
rawTarget = decodeURIComponent(rawTarget);
} catch (_) {
return { error: "Invalid URL encoding", status: 400 };
}
}
if (rawTarget.length > MAX_TARGET_URL_LENGTH) {
return { error: "Target URL is too long", status: 414 };
}
let target;
try {
target = new URL(rawTarget);
} catch (_) {
return { error: "Invalid target URL", status: 400 };
}
if (target.protocol !== "https:") {
return { error: "Only HTTPS targets are allowed", status: 403 };
}
if (
target.username ||
target.password ||
(target.port && target.port !== "443")
) {
return { error: "Credentials and non-standard ports are not allowed", status: 403 };
}
const hostname = target.hostname.toLowerCase();
if (!ALLOWED_HOSTS.has(hostname)) {
return { error: "Target host is not allowed", status: 403 };
}
const pathAllowed = ALLOWED_PATH_PREFIXES.some((prefix) =>
target.pathname.startsWith(prefix)
);
if (!pathAllowed) {
return { error: "Target path is not allowed", status: 403 };
}
// Fragments are never sent in HTTP requests.
target.hash = "";
return { target };
}
function addCorsToUpstreamResponse(upstream) {
const response = new Response(upstream.body, upstream);
// Do not leak upstream cookies or preserve conflicting CORS policy.
response.headers.delete("Set-Cookie");
response.headers.delete("Set-Cookie2");
response.headers.delete("Access-Control-Allow-Origin");
response.headers.delete("Access-Control-Allow-Credentials");
const cors = corsHeaders();
for (const name of Object.keys(cors)) {
response.headers.set(name, cors[name]);
}
response.headers.set("X-Cors-Proxy", "aliyun-esa");
return response;
}
async function handleRequest(request) {
const method = request.method.toUpperCase();
if (method === "OPTIONS") {
return new Response(null, {
status: 204,
headers: corsHeaders(),
});
}
if (method !== "GET" && method !== "HEAD") {
return jsonResponse(
{ ok: false, error: "Method not allowed" },
405
);
}
const requestUrl = new URL(request.url);
if (requestUrl.pathname === "/health") {
return jsonResponse({
ok: true,
service: "netease-cors-proxy",
});
}
const parsed = parseTarget(request.url);
if (parsed.error) {
// Make the root URL convenient to open while setting up the function.
if (
parsed.status === 400 &&
requestUrl.pathname === "/" &&
!requestUrl.searchParams.has("url")
) {
return jsonResponse({
ok: true,
service: "netease-cors-proxy",
usage: "https://YOUR_DOMAIN/?url={url}",
});
}
return jsonResponse(
{ ok: false, error: parsed.error },
parsed.status
);
}
const upstreamHeaders = new Headers();
upstreamHeaders.set("Accept", "application/json, text/plain, */*");
upstreamHeaders.set("Accept-Language", "zh-CN,zh;q=0.9,en;q=0.8");
upstreamHeaders.set("Origin", "https://music.163.com");
upstreamHeaders.set("Referer", "https://music.163.com/");
upstreamHeaders.set(
"User-Agent",
"Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 " +
"(KHTML, like Gecko) Chrome/131.0.0.0 Safari/537.36"
);
upstreamHeaders.set("Cookie", "os=pc");
try {
const upstream = await fetch(parsed.target.toString(), {
method,
headers: upstreamHeaders,
redirect: "manual",
});
// Do not let an upstream redirect turn this into a proxy for another host.
if (upstream.status >= 300 && upstream.status < 400) {
return jsonResponse(
{ ok: false, error: "Upstream redirect was blocked" },
502
);
}
return addCorsToUpstreamResponse(upstream);
} catch (error) {
return jsonResponse(
{
ok: false,
error: "Upstream request failed",
detail: String(error && error.message ? error.message : error),
},
502
);
}
}
export default {
async fetch(request) {
return handleRequest(request);
},
};
|
