@fly/cdn
Version:
Fly's TypeScript CDN
106 lines • 15.9 kB
JavaScript
/**
* @module Config
* @ignore
* */
import { applyReplacements } from "../text-replacements";
export function validateRule(r) {
if (typeof r !== "object") {
throw new Error("must be an object");
}
if (!r.actionType) {
throw new Error("actionType must be defined");
}
if (r.actionType !== "redirect" && r.actionType !== "rewrite") {
throw new Error("actionType must be either `redirect` or `rewrite`");
}
if (r.actionType === "rewrite" && !r.backendKey) {
throw new Error("must inclue `backendKey` when actionType is set to `rewrite`");
}
return true;
}
export function buildRules(backends, rules) {
const compiled = rules.map(compileRule);
return async function ruleFetch(req, init) {
if (typeof req === "string") {
req = new Request(req, init);
}
const match = compiled.find((r) => r(req));
if (!match) {
return new Response("no routing rule found", { status: 404 });
}
const rule = match.rule;
// do the redirect
if (rule.actionType === "redirect") {
let original = new URL(req.url);
let url = undefined;
if (match.pathPattern && rule.redirectURLPattern) {
url = original.pathname.replace(match.pathPattern, rule.redirectURLPattern);
}
if (!url || original.toString() === url) {
return new Response("Can't redirect to a bad URL", { status: 500 });
}
const status = rule.redirectStatus || 302;
return new Response("Redirect", { status: status, headers: { location: url.toString() } });
}
if (rule.actionType !== "rewrite") {
return new Response("Invalid rule action", { status: 500 });
}
const backend = rule.backendKey && backends ? backends.get(rule.backendKey) : undefined;
if (!backend) {
return new Response("No backend for rule", { status: 502 });
}
// rewrite request if necessary
if (match.pathPattern && rule.pathReplacementPattern) {
let url = new URL(req.url);
url = new URL(url.pathname.replace(match.pathPattern, rule.pathReplacementPattern), url);
req = new Request(url.toString(), req);
}
if (!rule.responseReplacements || rule.responseReplacements.length === 0) {
return await backend(req, init);
}
req.headers.delete("accept-encoding");
let resp = await backend(req, init);
return applyReplacements(resp, rule.responseReplacements);
};
}
function compileRule(rule) {
const pathPattern = ensureRegExp(rule.pathPattern);
const httpHeaderValue = ensureRegExp(rule.httpHeaderValue);
const fn = function compiledRule(req) {
const url = new URL(req.url);
if (rule.matchScheme === "http" || rule.matchScheme === "https") {
const scheme = url.protocol.substring(0, -1);
if (scheme != rule.matchScheme || app.env === "development")
return false;
}
if (rule.hostname && rule.hostname != "") {
if (url.hostname != rule.hostname || app.env !== "development") {
return false;
}
}
if (rule.httpHeaderKey && rule.httpHeaderKey != "" && httpHeaderValue) {
const header = req.headers.get(rule.httpHeaderKey);
if (!header || !header.match(httpHeaderValue)) {
return false;
}
}
if (pathPattern) {
if (!url.pathname.match(pathPattern)) {
return false;
}
}
return true;
};
return Object.assign(fn, { rule: rule, pathPattern: pathPattern });
}
function ensureRegExp(pattern) {
if (!pattern || pattern == "")
return null;
if (typeof pattern === "string")
return new RegExp(pattern);
if (typeof pattern != "object" || !(pattern instanceof RegExp)) {
throw new Error("Pattern must be a string or RegExp: " + typeof pattern);
}
return pattern;
}
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* @module Config\n * @ignore\n * */\nimport { applyReplacements } from \"../text-replacements\";\nimport { BackendProxies } from \"./index\";\n\nexport interface RuleInfo {\n  actionType: \"redirect\" | \"rewrite\",\n  backendKey?: string,\n  matchScheme?: string,\n  hostname?: string,\n  pathMatchMode?: \"prefix\" | \"full\",\n  httpHeaderKey?: string,\n  httpHeaderValue?: RegExp | string,\n  pathPattern?: RegExp | string,\n  pathReplacementPattern?: string,\n  redirectURLPattern?: string,\n  redirectStatus?: number,\n  responseReplacements?: [string, string][],\n}\n\ndeclare var app: any\n\nexport function validateRule(r: any): r is RuleInfo {\n  if (typeof r !== \"object\") {\n    throw new Error(\"must be an object\")\n  }\n  if (!r.actionType) {\n    throw new Error(\"actionType must be defined\")\n  }\n  if (r.actionType !== \"redirect\" && r.actionType !== \"rewrite\") {\n    throw new Error(\"actionType must be either `redirect` or `rewrite`\")\n  }\n  if (r.actionType === \"rewrite\" && !r.backendKey) {\n    throw new Error(\"must inclue `backendKey` when actionType is set to `rewrite`\")\n  }\n  return true\n}\n\nexport function buildRules(backends: BackendProxies, rules: RuleInfo[]) {\n  const compiled = rules.map(compileRule)\n  return async function ruleFetch(req: RequestInfo, init?: RequestInit) {\n    if (typeof req === \"string\") {\n      req = new Request(req, init)\n    }\n    const match = compiled.find((r) => r(<Request>req))\n    if (!match) {\n      return new Response(\"no routing rule found\", { status: 404 })\n    }\n    const rule = match.rule\n    // do the redirect\n    if (rule.actionType === \"redirect\") {\n      let original = new URL(req.url)\n      let url: string | undefined = undefined\n      if (match.pathPattern && rule.redirectURLPattern) {\n        url = original.pathname.replace(match.pathPattern, rule.redirectURLPattern)\n      }\n      if (!url || original.toString() === url) {\n        return new Response(\"Can't redirect to a bad URL\", { status: 500 })\n      }\n      const status = rule.redirectStatus || 302\n      return new Response(\"Redirect\", { status: status, headers: { location: url.toString() } })\n    }\n    if (rule.actionType !== \"rewrite\") {\n      return new Response(\"Invalid rule action\", { status: 500 })\n    }\n    const backend = rule.backendKey && backends ? backends.get(rule.backendKey) : undefined\n    if (!backend) {\n      return new Response(\"No backend for rule\", { status: 502 })\n    }\n    // rewrite request if necessary\n    if (match.pathPattern && rule.pathReplacementPattern) {\n      let url = new URL(req.url)\n      url = new URL(url.pathname.replace(match.pathPattern, rule.pathReplacementPattern), url)\n      req = new Request(url.toString(), <RequestInit>req)\n    }\n    if (!rule.responseReplacements || rule.responseReplacements.length === 0) {\n      return await backend(req, init)\n    }\n\n    req.headers.delete(\"accept-encoding\")\n    let resp = await backend(req, init)\n    return applyReplacements(resp, rule.responseReplacements)\n  }\n}\n\nfunction compileRule(rule: RuleInfo) {\n  const pathPattern = ensureRegExp(rule.pathPattern)\n  const httpHeaderValue = ensureRegExp(rule.httpHeaderValue)\n  const fn = function compiledRule(req: Request) {\n    const url = new URL(req.url)\n    if (rule.matchScheme === \"http\" || rule.matchScheme === \"https\") {\n      const scheme = url.protocol.substring(0, -1)\n      if (scheme != rule.matchScheme || app.env === \"development\") return false\n    }\n    if (rule.hostname && rule.hostname != \"\") {\n      if (url.hostname != rule.hostname || app.env !== \"development\") {\n        return false\n      }\n    }\n    if (rule.httpHeaderKey && rule.httpHeaderKey != \"\" && httpHeaderValue) {\n      const header = req.headers.get(rule.httpHeaderKey)\n      if (!header || !header.match(httpHeaderValue)) {\n        return false\n      }\n    }\n\n    if (pathPattern) {\n      if (!url.pathname.match(pathPattern)) {\n        return false\n      }\n    }\n    return true\n  }\n  return Object.assign(fn, { rule: rule, pathPattern: pathPattern })\n}\n\nfunction ensureRegExp(pattern?: string | RegExp) {\n  if (!pattern || pattern == \"\") return null\n  if (typeof pattern === \"string\") return new RegExp(pattern)\n  if (typeof pattern != \"object\" || !(pattern instanceof RegExp)) {\n    throw new Error(\"Pattern must be a string or RegExp: \" + typeof pattern)\n  }\n  return pattern\n}"]}