@fly/edge
Version:
Fly's TypeScript Edge
176 lines • 26.9 kB
JavaScript
;
Object.defineProperty(exports, "__esModule", { value: true });
exports.rewriteLocationHeader = exports.buildProxyRequest = exports.proxy = void 0;
function sleep(ms) {
return new Promise((resolve, _) => {
setTimeout(resolve, ms);
});
}
/**
* This generates a `fetch` like function for proxying requests to a given origin.
* When this function makes origin requests, it adds standard proxy headers like
* `X-Forwarded-Host` and `X-Forwarded-For`. It also passes headers from the original
* request to the origin.
* @param origin A URL to an origin, can include a path to rebase requests.
* @param options Options and headers to control origin request.
*/
function proxy(origin, options) {
if (!options) {
options = {};
}
if (options.errorTo503 !== false) {
options.errorTo503 = true;
}
options.origin = origin.toString();
const fetchFn = options.fetch || fetch;
async function proxyFetch(req, init) {
if (!(req instanceof Request)) {
req = new Request(req, init);
init = undefined;
}
if (!options) {
options = {};
}
const breq = buildProxyRequest(origin, options, req, init);
const retries = options.retries || 0;
const delayMS = 100;
let tryCount = 0;
do {
if (tryCount > 0) {
console.warn("Retrying request:", tryCount, "in", delayMS * tryCount * tryCount, "ms");
await sleep(Math.min(delayMS * tryCount * tryCount, 5000));
breq.headers.set("Fly-Proxy-Retry", tryCount.toString());
}
tryCount += 1;
try {
let bresp = await fetchFn(breq.clone(), { certificate: options.certificate, tls: options.tls });
if (options.rewriteLocationHeaders !== false) {
bresp = rewriteLocationHeader(req.url, breq.url, bresp);
}
return bresp; // breaks loop on successful response
}
catch (err) {
if (tryCount < retries) {
continue;
}
if (!options.errorTo503)
throw err; // breaks loop
}
} while (tryCount <= retries);
return new Response("origin error", { status: 503 });
}
return Object.assign(proxyFetch, { proxyConfig: options });
}
exports.proxy = proxy;
/**
* @protected
* @hidden
* @param origin
* @param options
* @param req
* @param init
*/
function buildProxyRequest(origin, options, req, init) {
if (typeof req === "string") {
req = new Request(req, init);
init = undefined;
}
if (!(req instanceof Request)) {
throw new Error("req must be either a string or a Request object");
}
const url = new URL(req.url);
let breq = null;
breq = req.clone();
if (typeof origin === "string") {
origin = new URL(origin);
}
const requestedHostname = req.headers.get("host") || url.hostname;
url.hostname = origin.hostname;
url.protocol = origin.protocol;
url.port = origin.port;
if (options.stripPath && typeof options.stripPath === "string") {
// remove basePath so we can serve `onehosthame.com/dir/` from `origin.com/`
url.pathname = url.pathname.substring(options.stripPath.length);
}
if (origin.pathname && origin.pathname.length > 0) {
url.pathname = [origin.pathname.replace(/\/$/, ""), url.pathname.replace(/^\//, "")].join("/");
}
if (url.pathname.startsWith("//")) {
url.pathname = url.pathname.substring(1);
}
if (url.toString() !== breq.url) {
breq = new Request(url.toString(), breq);
}
// we extend req with remoteAddr
if (req.remoteAddr) {
breq.headers.set("x-forwarded-for", req.remoteAddr);
}
breq.headers.set("x-forwarded-host", requestedHostname);
breq.headers.set("x-forwarded-proto", url.protocol.replace(":", ""));
if (!options.forwardHostHeader) {
// set host header to origin.hostnames
breq.headers.set("host", origin.hostname);
}
if (options.headers) {
for (const h of Object.getOwnPropertyNames(options.headers)) {
const v = options.headers[h];
if (v === false) {
breq.headers.delete(h);
}
else if (v && typeof v === "string") {
breq.headers.set(h, v);
}
}
}
return breq;
}
exports.buildProxyRequest = buildProxyRequest;
function rewriteLocationHeader(url, burl, resp) {
const locationHeader = resp.headers.get("location");
if (!locationHeader) {
return resp;
}
if (typeof url === "string") {
url = new URL(url);
}
if (typeof burl === "string") {
burl = new URL(burl);
}
const location = new URL(locationHeader, burl);
if (location.hostname !== burl.hostname || location.protocol !== burl.protocol) {
return resp;
}
let pathname = location.pathname;
if (url.pathname.endsWith(burl.pathname)) {
// url path: /original/path/
// burl path: /path/
// need to prefix base
const prefix = url.pathname.substring(0, url.pathname.length - burl.pathname.length);
pathname = prefix + location.pathname;
}
else if (burl.pathname.endsWith(url.pathname)) {
// url path: /original/path/
// burl path: /path/
// need to remove prefix
const remove = burl.pathname.substring(0, burl.pathname.length - url.pathname.length);
if (location.pathname.startsWith(remove)) {
pathname = location.pathname.substring(remove.length, location.pathname.length);
}
}
if (pathname !== location.pathname) {
// do the rewrite
location.pathname = pathname;
location.protocol = url.protocol;
location.hostname = url.hostname;
resp.headers.set("location", location.toString());
}
return resp;
}
exports.rewriteLocationHeader = rewriteLocationHeader;
/*
Requests with rewrites:
- https://example.com/blog/ -> https://example.blogservice.com/
- strip /blog/ to backend (proxy function does this)
- prepend /blog/ to location headers on response
*/
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* Library for proxying requests to origins. Use this to create `fetch` like functions\n *  for making requests to other services. For example:\n *\n * ```javascript\n * // sends all traffic to an Amazon ELB,\n * // `Host` header passes through from visitor request\n * const origin = proxy(\"https://elb1298.amazonaws.com\")\n * ```\n *\n * By default, this function sends the `Host` header inferred from the origin URL. To forward\n * host headers sent by visitors, set `forwardHostHeader` to true.\n *\n * ```javascript\n * // sends all traffic to an Amazon ELB, include host header from original request.\n * const origin = proxy(\"https://elb1298.amazonaws.com\", {\n *  forwardHostHeader: true\n * })\n * ```\n *\n * And then way more rare, no host header at all. Usually you'd strip out `x-forwarded-host`,\n * since some origins don't like that:\n * ```javascript\n * // sends all traffic to an Amazon ELB, never sends a host header\n * const origin = proxy(\"https://elb1298.amazonaws.com\", {\n *  headers: { host: false}\n * })\n * ```\n *\n * @preferred\n * @module HTTP\n */\nimport { normalizeRequest, FetchFunction } from \"./fetch\"\nfunction sleep(ms: number){\n  return new Promise<void>((resolve, _) => {\n    setTimeout(resolve, ms)\n  });\n}\n/**\n * This generates a `fetch` like function for proxying requests to a given origin.\n * When this function makes origin requests, it adds standard proxy headers like\n * `X-Forwarded-Host` and `X-Forwarded-For`. It also passes headers from the original\n * request to the origin.\n * @param origin A URL to an origin, can include a path to rebase requests.\n * @param options Options and headers to control origin request.\n */\nexport function proxy(origin: string | URL, options?: ProxyOptions): ProxyFunction<ProxyOptions> {\n  if (!options) {\n    options = {}\n  }\n  if(options.errorTo503 !== false){\n    options.errorTo503 = true;\n  }\n  options.origin = origin.toString();\n  const fetchFn = options.fetch || fetch;\n  async function proxyFetch(req: RequestInfo, init?: RequestInit) {\n    if(!(req instanceof Request)){\n      req = new Request(req, init);\n      init = undefined;\n    }\n    if (!options) {\n      options = {}\n    }\n    const breq = buildProxyRequest(origin, options, req, init)\n    const retries = options.retries || 0;\n    const delayMS = 100;\n    let tryCount = 0;\n    do {\n      if(tryCount > 0){\n        console.warn(\"Retrying request:\", tryCount, \"in\", delayMS * tryCount * tryCount, \"ms\")\n        await sleep(Math.min(delayMS * tryCount * tryCount, 5000));\n        breq.headers.set(\"Fly-Proxy-Retry\", tryCount.toString());\n      }\n      tryCount += 1;\n      try{\n        let bresp = await fetchFn(breq.clone(), { certificate: options.certificate, tls: options.tls })\n        if(options.rewriteLocationHeaders !== false){\n          bresp = rewriteLocationHeader(req.url, breq.url, bresp)\n        }\n        return bresp // breaks loop on successful response\n      }catch(err){\n        if(tryCount < retries){\n          continue;\n        }\n        if(!options.errorTo503) throw err; // breaks loop\n      }\n    } while(tryCount <= retries);\n    return new Response(\"origin error\", { status: 503 })\n  }\n\n  return Object.assign(proxyFetch, { proxyConfig: options})\n}\n\n/**\n * @protected\n * @hidden\n * @param origin\n * @param options\n * @param req\n * @param init\n */\nexport function buildProxyRequest(origin: string | URL, options: ProxyOptions, req: RequestInfo, init?: RequestInit) {\n  if (typeof req === \"string\") {\n    req = new Request(req, init)\n    init = undefined\n  }\n\n  if (!(req instanceof Request)) {\n    throw new Error(\"req must be either a string or a Request object\")\n  }\n\n  const url = new URL(req.url)\n  let breq: Request | null = null\n\n  breq = req.clone()\n\n  if (typeof origin === \"string\") {\n    origin = new URL(origin)\n  }\n\n  const requestedHostname = req.headers.get(\"host\") || url.hostname\n  url.hostname = origin.hostname\n  url.protocol = origin.protocol\n  url.port = origin.port\n\n  if (options.stripPath && typeof options.stripPath === \"string\") {\n    // remove basePath so we can serve `onehosthame.com/dir/` from `origin.com/`\n    url.pathname = url.pathname.substring(options.stripPath.length)\n  }\n  if (origin.pathname && origin.pathname.length > 0) {\n    url.pathname = [origin.pathname.replace(/\\/$/, \"\"), url.pathname.replace(/^\\//, \"\")].join(\"/\")\n  }\n  if (url.pathname.startsWith(\"//\")) {\n    url.pathname = url.pathname.substring(1)\n  }\n\n  if (url.toString() !== breq.url) {\n    breq = new Request(url.toString(), breq)\n  }\n  // we extend req with remoteAddr\n  if(req.remoteAddr){\n    breq.headers.set(\"x-forwarded-for\", req.remoteAddr)\n  }\n  breq.headers.set(\"x-forwarded-host\", requestedHostname)\n  breq.headers.set(\"x-forwarded-proto\", url.protocol.replace(\":\", \"\"))\n\n  if (!options.forwardHostHeader) {\n    // set host header to origin.hostnames\n    breq.headers.set(\"host\", origin.hostname)\n  }\n\n  if (options.headers) {\n    for (const h of Object.getOwnPropertyNames(options.headers)) {\n      const v = options.headers[h]\n      if (v === false) {\n        breq.headers.delete(h)\n      } else if (v && typeof v === \"string\") {\n        breq.headers.set(h, v)\n      }\n    }\n  }\n  return breq;\n}\n\nexport function rewriteLocationHeader(url: URL | string, burl: URL | string, resp: Response){\n  const locationHeader = resp.headers.get(\"location\")\n  if(!locationHeader){\n    return resp\n  }\n  if(typeof url === \"string\"){\n    url = new URL(url)\n  }\n  if(typeof burl === \"string\"){\n    burl = new URL(burl)\n  }\n  const location = new URL(locationHeader, burl)\n\n  if(location.hostname !== burl.hostname || location.protocol !== burl.protocol){\n    return resp\n  }\n\n\n  let pathname = location.pathname\n  if(url.pathname.endsWith(burl.pathname)){\n    // url path: /original/path/\n    // burl path: /path/\n    // need to prefix base\n    const prefix = url.pathname.substring(0, url.pathname.length - burl.pathname.length)\n    pathname = prefix + location.pathname\n\n  } else if(burl.pathname.endsWith(url.pathname)) {\n    // url path: /original/path/\n    // burl path: /path/\n    // need to remove prefix\n    const remove = burl.pathname.substring(0, burl.pathname.length - url.pathname.length)\n    if(location.pathname.startsWith(remove)){\n      pathname = location.pathname.substring(remove.length, location.pathname.length)\n    }\n  }\n  if(pathname !== location.pathname){\n    // do the rewrite\n    location.pathname = pathname\n    location.protocol = url.protocol\n    location.hostname = url.hostname\n    resp.headers.set(\"location\", location.toString())\n  }\n\n  return resp\n}\n\n/**\n * Options for `proxy`.\n */\nexport interface ProxyOptions {\n  /**\n   * Replace this portion of URL path before making request to origin.\n   *\n   * For example, this makes a request to `https://fly.io/path1/to/document.html`:\n   * ```javascript\n   * const opts = { stripPath: \"/path2/\"}\n   * const origin = proxy(\"https://fly.io/path1/\", opts)\n   * origin(\"https://somehostname.com/path2/to/document.html\")\n   * ```\n   */\n  stripPath?: string\n\n  /**\n   * Forward `Host` header from original request. Without this options,\n   * proxy requests infers a host header from the origin URL.\n   * Defaults to `false`.\n   */\n  forwardHostHeader?: boolean\n\n  /**\n   * Rewrite location headers (defaults to true) to match incoming request.\n   * \n   * Example:\n   *  - Request url: http://test.com/blog/asdf\n   *  - Proxy url: http://origin.com/asdf\n   *  - Location http://origin.com/jklm bcomes http://test.com/blog/jklm\n   */\n  rewriteLocationHeaders?: boolean\n  /**\n   * Headers to set on backend request. Each header accepts either a `boolean` or `string`.\n   * * If set to `false`, strip header entirely before sending.\n   * * `true` or `undefined` send the header through unmodified from the original request.\n   * * `string` header values are sent as is\n   */\n  headers?: {\n    [key: string]: string | boolean | undefined\n    /**\n     * Host header to set before sending origin request. Some sites only respond to specific\n     * host headers.\n     */\n    host?: string | boolean\n  }\n\n  /**\n   * When underlying fetch throws an error, return a 503 response.\n   * \n   * Defaults to `true`.\n   */\n  errorTo503?: boolean,\n\n  /**\n   * When underlying connection throughs an error, retry request <N> times.\n   */\n  retries?: number,\n\n  /** @private */\n  origin?: string,\n\n  /** @private */\n  fetch?: FetchFunction,\n\n  certificate?: {\n    key?: string | Buffer | Array<string | Buffer>\n    cert?: string | Buffer | Array<string | Buffer>\n    ca?: string | Buffer | Array<string | Buffer>\n    pfx?: string | Buffer | Array<string | Buffer>\n    passphrase?: string\n  },\n\n  tls?:{\n    servername?: string\n  }\n}\n\n\n/**\n * A proxy `fetch` like function. These functions include their \n * original configuration information.\n */\nexport interface ProxyFunction<T = unknown> extends FetchFunction {\n  proxyConfig: T\n}\n\nexport interface ProxyFactory<TOpts = any, TInput = any> {\n  (options: TInput): ProxyFunction<TOpts>;\n  normalizeOptions?: (input: any) => TOpts;\n}\n\n/*\n Requests with rewrites:\n   - https://example.com/blog/ -> https://example.blogservice.com/\n   - strip /blog/ to backend (proxy function does this)\n   - prepend /blog/ to location headers on response\n*/\n"]}