@fly/cdn
Version:
Fly's TypeScript CDN
111 lines • 14.2 kB
JavaScript
/**
* @module Backends
*/
import { proxy } from "../proxy";
import { isObject, merge } from "../util";
import * as errors from "../errors";
/**
* Creates a fetch-like proxy function for making requests to GitHub pages
* hosted sites.
*
* Example:
*
* ```typescript
* import { githubPages } from "./src/backends";
* const backend = githubPages({
* owner: "superfly",
* repo: "cdn",
* hostname: "docs.fly.io"
* });
* ```
* @param config The Github repository to proxy to
* @module Backends
*/
export function githubPages(options) {
const config = _normalizeOptions(options);
let ghFetch = buildGithubPagesProxy(config);
let buildTime = 0; // first failure might need a retry
const c = config;
const fn = async function githubPagesFetch(req, init) {
const original = ghFetch;
if (typeof req === "string") {
req = new Request(req, init);
}
console.debug("ghpages starting fetch:", req.url, buildTime);
let resp = await ghFetch(req, init);
console.debug("ghpages resp status:", resp.status);
if (resp.status === 404 && ghFetch.proxyConfig.hostname) {
// hostname might've been cleared
const url = new URL(req.url);
const diff = Date.now() - buildTime;
if ((url.pathname === "/" && diff > 10000) // retry after 10s for root
|| diff > 30000) { // wait 5min for everything else
console.debug("ghpages hostname request got 404:", c.hostname);
c.hostname = undefined;
ghFetch = buildGithubPagesProxy(c);
}
}
if (resp.status === 301 && !ghFetch.proxyConfig.hostname) {
// 301s happen when you request <org>.github.io/<repo> and need a custom domain
let location = resp.headers.get("location");
if (location) {
const url = new URL(location);
c.hostname = url.hostname;
ghFetch = buildGithubPagesProxy(c);
console.debug("ghpages found hostname:", c);
}
}
if (original !== ghFetch) {
// underlying proxy function changed, store it and retry
console.debug("ghpages got a new fetch fn");
self.proxyConfig = ghFetch.proxyConfig;
resp = await ghFetch(req, init);
}
return resp;
};
let self = Object.assign(fn, { proxyConfig: ghFetch.proxyConfig });
return self;
}
githubPages.normalizeOptions = _normalizeOptions;
function _normalizeOptions(input) {
const options = { owner: "", repository: "" };
if (typeof input === "string" && input.includes("/")) {
[options.owner, options.repository] = input.split("/");
}
else if (isObject(input)) {
merge(options, input, ["owner", "repository", "hostname"]);
}
else {
throw errors.invalidInput("options must be a GitHubPagesOptions object or `owner/repo` string");
}
if (!options.owner) {
throw errors.invalidProperty("owner", "is required");
}
if (!options.repository) {
throw errors.invalidProperty("repository", "is required");
}
return options;
}
function buildGithubPagesProxy(options) {
const { owner, repository, hostname } = options;
const ghHost = `${owner}.github.io`;
const headers = {
host: ghHost,
"x-forwarded-host": false
};
let path = `/${repository}/`;
if (hostname) {
path = '/'; // no repo path when hostname exists
headers.host = hostname;
}
console.debug("ghpages creating proxy:", `https://${ghHost}${path}`, {
headers: headers,
stripPath: path
});
const fn = proxy(`https://${ghHost}${path}`, {
headers: headers,
stripPath: path
});
return Object.assign(fn, { proxyConfig: options });
}
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* @module Backends\n */\nimport { proxy, ProxyFunction } from \"../proxy\";\nimport { isObject, merge } from \"../util\";\nimport * as errors from \"../errors\";\n\n\n/**\n * GitHub Repository information.\n */\nexport interface GitHubPagesOptions {\n\n  /** Repository owner */\n  owner: string,\n\n  /** Repository name <repository> format */\n  repository: string,\n\n  /** The custom hostname on repository */\n  hostname?: string\n}\n\n/**\n * Creates a fetch-like proxy function for making requests to GitHub pages\n * hosted sites.\n * \n * Example:\n * \n * ```typescript\n * import { githubPages } from \"./src/backends\";\n * const backend = githubPages({\n *  owner: \"superfly\",\n *  repo: \"cdn\",\n *  hostname: \"docs.fly.io\"\n * });\n * ```\n * @param config The Github repository to proxy to\n * @module Backends\n */\nexport function githubPages(options: GitHubPagesOptions | string): ProxyFunction<GitHubPagesOptions> {\n  const config = _normalizeOptions(options);\n\n  let ghFetch = buildGithubPagesProxy(config)\n  let buildTime = 0 // first failure might need a retry\n\n  const c = config\n\n  const fn = async function githubPagesFetch(req: RequestInfo, init?: RequestInit) {\n    const original = ghFetch\n    if(typeof req === \"string\"){\n      req = new Request(req, init)\n    }\n    console.debug(\"ghpages starting fetch:\", req.url, buildTime)\n    let resp = await ghFetch(req, init)\n    console.debug(\"ghpages resp status:\", resp.status)\n    if(resp.status === 404 && ghFetch.proxyConfig.hostname){\n      // hostname might've been cleared\n      const url = new URL(req.url)\n      const diff = Date.now() - buildTime\n      if(\n        (url.pathname === \"/\" && diff > 10000) // retry after 10s for root\n       || diff > 30000){ // wait 5min for everything else\n\n\n        console.debug(\"ghpages hostname request got 404:\", c.hostname)\n        c.hostname = undefined\n        ghFetch = buildGithubPagesProxy(c)\n      }\n    }\n    if(resp.status === 301 && !ghFetch.proxyConfig.hostname){\n      // 301s happen when you request <org>.github.io/<repo> and need a custom domain\n      let location = resp.headers.get(\"location\")\n      if(location){\n        const url = new URL(location)\n        c.hostname = url.hostname\n        ghFetch = buildGithubPagesProxy(c)\n        console.debug(\"ghpages found hostname:\", c)\n      }\n    }\n    if(original !== ghFetch){\n      // underlying proxy function changed, store it and retry\n      console.debug(\"ghpages got a new fetch fn\")\n      self.proxyConfig = ghFetch.proxyConfig\n      resp = await ghFetch(req, init)\n    }\n    return resp\n  }\n\n  let self = Object.assign(fn, { proxyConfig: ghFetch.proxyConfig})\n  return self\n}\n\ngithubPages.normalizeOptions = _normalizeOptions;\n\nfunction _normalizeOptions(input: unknown): GitHubPagesOptions {\n  const options: GitHubPagesOptions = { owner: \"\", repository: \"\" };\n\n  if (typeof input === \"string\" && input.includes(\"/\")) {\n    [options.owner, options.repository] = input.split(\"/\");\n  } else if (isObject(input)) {\n    merge(options, input, [\"owner\", \"repository\", \"hostname\"]);\n  } else {\n    throw errors.invalidInput(\"options must be a GitHubPagesOptions object or `owner/repo` string\");\n  }\n\n  if (!options.owner) {\n    throw errors.invalidProperty(\"owner\", \"is required\");\n  }\n  if (!options.repository) {\n    throw errors.invalidProperty(\"repository\", \"is required\");\n  }\n\n  return options;\n}\n\nfunction buildGithubPagesProxy(options: GitHubPagesOptions): ProxyFunction<GitHubPagesOptions> {\n  const {owner, repository, hostname} = options\n  const ghHost = `${owner}.github.io`\n  const headers = {\n    host: ghHost,\n    \"x-forwarded-host\": false\n  }\n  let path  = `/${repository}/`\n  \n  if(hostname){\n    path = '/' // no repo path when hostname exists\n    headers.host = hostname\n  }\n\n  console.debug(\"ghpages creating proxy:\", `https://${ghHost}${path}`, {\n    headers: headers,\n    stripPath: path\n  })\n  const fn = proxy(`https://${ghHost}${path}`, {\n    headers: headers,\n    stripPath: path\n  })\n\n  return Object.assign(fn, { proxyConfig: options } )\n}"]}