@fly/edge
Version:
Fly's TypeScript Edge
166 lines • 22.4 kB
JavaScript
;
Object.defineProperty(exports, "__esModule", { value: true });
exports.PathPatternMatcher = exports.buildRules = exports.validateRule = void 0;
/**
* @module Config
* @ignore
* */
const text_replacements_1 = require("../text-replacements");
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;
}
exports.validateRule = validateRule;
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 = match.pathPattern.replace(original.pathname, rule.redirectURLPattern);
}
else if (rule.redirectURLPattern) {
url = rule.redirectURLPattern;
}
if (!url || original.toString() === url) {
return new Response("Can't redirect to a bad URL", { status: 500 });
}
const status = rule.redirectStatus || 302;
const redirectTo = new URL(url, original);
return new Response("Redirect", { status: status, headers: { location: redirectTo.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(match.pathPattern.replace(url.pathname, 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 text_replacements_1.applyReplacements(resp, rule.responseReplacements);
};
}
exports.buildRules = buildRules;
function compileRule(rule) {
const pathPattern = ensurePathPatternMatcher(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.slice(0, -1);
if (scheme !== rule.matchScheme)
return false;
}
if (rule.hostname && rule.hostname !== "") {
if (url.hostname !== rule.hostname) {
return false;
}
}
if (rule.httpHeaderKey && rule.httpHeaderKey !== "" && httpHeaderValue) {
const header = req.headers.get(rule.httpHeaderKey);
if (!header || !header.match(httpHeaderValue)) {
return false;
}
}
if (pathPattern && !pathPattern.match(url.pathname)) {
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 (pattern instanceof RegExp)
return pattern;
throw new Error("Pattern must be a string or RegExp: " + typeof pattern);
}
function ensurePathPatternMatcher(pattern) {
if (!pattern || pattern == "")
return null;
if (typeof pattern === "string")
return new PathPatternMatcher(pattern);
if (pattern instanceof RegExp)
return new PathPatternMatcher(pattern);
throw new Error("Pattern must be a string or RegExp: " + typeof pattern);
}
class PathPatternMatcher {
constructor(pattern) {
this.params = [];
if (pattern instanceof RegExp) {
this.regex = pattern;
}
else {
const matches = pattern.match(/([:\*]\w+)/g);
if (matches) {
for (const match of matches) {
this.params.push(match.substring(1));
if (match.startsWith(":")) {
pattern = pattern.replace(match, "([^/.]+)");
}
else if (match.startsWith("*")) {
pattern = pattern.replace(match, "(.+)");
}
}
}
this.regex = new RegExp(pattern);
}
}
match(path) {
return this.regex.test(path);
}
parse(path) {
const params = {};
const match = this.regex.exec(path);
if (!match) {
return params;
}
for (const [paramIndex, paramName] of this.params.entries()) {
params[paramName] = match[paramIndex + 1];
}
return params;
}
replace(path, replacement) {
const params = this.parse(path);
for (const [name, value] of Object.entries(params)) {
replacement = replacement.replace(`$${name}`, value);
}
return replacement;
}
}
exports.PathPatternMatcher = PathPatternMatcher;
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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 = match.pathPattern.replace(original.pathname, rule.redirectURLPattern)\n      } else if (rule.redirectURLPattern) {\n        url = 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      const redirectTo = new URL(url, original)\n      return new Response(\"Redirect\", { status: status, headers: { location: redirectTo.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(match.pathPattern.replace(url.pathname, 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 = ensurePathPatternMatcher(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.slice(0, -1)\n      if (scheme !== rule.matchScheme) return false\n    }\n    if (rule.hostname && rule.hostname !== \"\") {\n      if (url.hostname !== rule.hostname) {\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    if (pathPattern && !pathPattern.match(url.pathname)) {\n      return false\n    }\n    return true\n  }\n  return Object.assign(fn, { rule: rule, pathPattern: pathPattern })\n}\n\nfunction ensureRegExp(pattern?: string | RegExp): RegExp | null {\n  if (!pattern || pattern == \"\") return null\n  if (typeof pattern === \"string\") return new RegExp(pattern)\n  if (pattern instanceof RegExp) return pattern\n\n  throw new Error(\"Pattern must be a string or RegExp: \" + typeof pattern)\n}\n\nfunction ensurePathPatternMatcher(pattern?: string | RegExp): PathPatternMatcher | null {\n  if (!pattern || pattern == \"\") return null\n  if (typeof pattern === \"string\") return new PathPatternMatcher(pattern)\n  if (pattern instanceof RegExp) return new PathPatternMatcher(pattern)\n\n  throw new Error(\"Pattern must be a string or RegExp: \" + typeof pattern)\n}\n\n\nexport class PathPatternMatcher {\n  private regex: RegExp\n  private params: string[] = []\n\n  constructor(pattern: string | RegExp) {\n    if (pattern instanceof RegExp) {\n      this.regex = pattern\n    } else {\n      const matches = pattern.match(/([:\\*]\\w+)/g)\n      if (matches) {\n        for (const match of matches) {\n          this.params.push(match.substring(1))\n          if (match.startsWith(\":\")) {\n            pattern = pattern.replace(match, \"([^/.]+)\")\n          } else if (match.startsWith(\"*\")) {\n            pattern = pattern.replace(match, \"(.+)\")\n          }\n        }\n      }\n      this.regex = new RegExp(pattern)\n    }\n  }\n\n  match(path: string) {\n    return this.regex.test(path)\n  }\n\n  parse(path: string) {\n    const params: { [name: string]: string } = {}\n\n    const match = this.regex.exec(path)\n    if (!match) {\n      return params\n    }\n    for (const [paramIndex, paramName] of this.params.entries()) {\n      params[paramName] = match[paramIndex + 1];\n    }\n    return params\n  }\n\n  replace(path: string, replacement: string) {\n    const params = this.parse(path)\n    for (const [name, value] of Object.entries(params)) {\n      replacement = replacement.replace(`$${name}`, value)\n    }\n    return replacement\n  }\n}\n"]}