232 lines
5.7 KiB
TypeScript
232 lines
5.7 KiB
TypeScript
import * as http from 'node:http';
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import * as https from 'node:https';
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import { URL } from 'node:url';
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import * as dns from 'node:dns';
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import CacheableLookup from 'cacheable-lookup';
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import fetch from 'node-fetch';
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import { HttpProxyAgent, HttpsProxyAgent } from 'hpagent';
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import ipaddr from 'ipaddr.js';
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import IPCIDR from 'ip-cidr';
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import { SECOND } from '@/const.js';
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import config from '@/config/index.js';
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export async function getJson(url: string, accept = 'application/json, */*', timeout = 10 * SECOND, headers: Record<string, string> = {}) {
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const res = await getResponse({
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url,
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method: 'GET',
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headers: Object.assign({
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Accept: accept,
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}, headers),
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timeout,
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});
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return await res.json();
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}
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export async function getHtml(url: string, accept = 'text/html, */*', timeout = 10 * SECOND, headers: Record<string, string> = {}) {
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const res = await getResponse({
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url,
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method: 'GET',
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headers: Object.assign({
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Accept: accept,
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}, headers),
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timeout,
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});
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return await res.text();
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}
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export async function getResponse(_args: {
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url: string,
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method: string,
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body?: string,
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headers: Record<string, string>,
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timeout?: number,
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size?: number,
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redirect?: 'follow' | 'manual' | 'error',
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}) {
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const args = {
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timeout: 10 * SECOND,
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size: 10 * 1024 * 1024, // 10 MiB
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redirect: 'follow',
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..._args,
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};
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const res = await fetch(args.url, {
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method: args.method,
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headers: Object.assign({
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'User-Agent': config.userAgent,
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}, args.headers),
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body: args.body,
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redirect: args.redirect,
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size: args.size,
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agent: getAgentByUrl,
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signal: AbortSignal.timeout(args.timeout),
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});
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if (
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!res.ok
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&&
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// intended redirect is not an error
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!(args.redirect != 'follow' && res.status >= 300 && res.status < 400)) {
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throw new StatusError(`${res.status} ${res.statusText}`, res.status, res.statusText);
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}
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return res;
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}
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const cache = new CacheableLookup({
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maxTtl: 3600, // 1hours
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errorTtl: 30, // 30secs
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lookup: false, // nativeのdns.lookupにfallbackしない
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});
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// because `cacheable-lookup` is annoying and prefers IPv4 by default,
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// we need a little wrapper setting some extra options
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const cacheLookup = (host, _2, _3) => {
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// do all the weird parameter shenanigans that nodejs's dns.lookup does.
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let options = {}, callback;
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if (_3) {
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options = _2;
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if (typeof options === 'number') {
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options = { family: options };
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}
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callback = _3;
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} else {
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callback = _2;
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}
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// here come the shenanigans, trying to be careful not to mess up
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// intentionally different behaviour
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if (options.family == null && (options.hints ?? 0) === 0) {
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options.family = 6;
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options.hints = dns.V4MAPPED;
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}
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// callback wrapper that checks whether an IP is private.
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// Private IPs will not be returned in the first place.
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const wrapper = (err, address, family) => {
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// mimics dns.lookup behaviour as if no result was found
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const fakeErr = new Error("private IP");
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fakeErr.code = 'ENOTFOUND';
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if (err != null) {
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return callback(err, address, family);
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} else if (options.all) {
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const results = address.filter(({ address, family }) => isPublicIp(address));
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if (results.length === 0) {
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return callback(fakeErr);
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} else {
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return callback(err, results);
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}
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} else {
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if (isPublicIp(address)) {
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return callback(err, address, family);
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} else {
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return callback(fakeErr);
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}
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}
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};
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return cache.lookup(host, options, wrapper);
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};
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/**
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* Get http non-proxy agent
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*/
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const _http = new http.Agent({
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keepAlive: true,
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keepAliveMsecs: 30 * SECOND,
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lookup: cacheLookup,
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} as http.AgentOptions);
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/**
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* Get https non-proxy agent
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*/
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const _https = new https.Agent({
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keepAlive: true,
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keepAliveMsecs: 30 * SECOND,
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lookup: cacheLookup,
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} as https.AgentOptions);
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const maxSockets = Math.max(256, config.deliverJobConcurrency);
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/**
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* Get http proxy or non-proxy agent
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*/
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export const httpAgent = config.proxy
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? new HttpProxyAgent({
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keepAlive: true,
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keepAliveMsecs: 30 * SECOND,
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maxSockets,
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maxFreeSockets: 256,
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scheduling: 'lifo',
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proxy: config.proxy,
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})
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: _http;
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/**
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* Get https proxy or non-proxy agent
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*/
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export const httpsAgent = config.proxy
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? new HttpsProxyAgent({
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keepAlive: true,
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keepAliveMsecs: 30 * SECOND,
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maxSockets,
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maxFreeSockets: 256,
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scheduling: 'lifo',
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proxy: config.proxy,
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})
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: _https;
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/**
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* Get agent by URL
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* @param url URL
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* @param bypassProxy Allways bypass proxy
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*/
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export function getAgentByUrl(url: URL, bypassProxy = false) {
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if (bypassProxy || (config.proxyBypassHosts || []).includes(url.hostname)) {
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return url.protocol === 'http:' ? _http : _https;
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} else {
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return url.protocol === 'http:' ? httpAgent : httpsAgent;
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}
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}
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export class StatusError extends Error {
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public statusCode: number;
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public statusMessage?: string;
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public isClientError: boolean;
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constructor(message: string, statusCode: number, statusMessage?: string) {
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super(message);
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this.name = 'StatusError';
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this.statusCode = statusCode;
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this.statusMessage = statusMessage;
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this.isClientError = typeof this.statusCode === 'number' && this.statusCode >= 400 && this.statusCode < 500;
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}
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}
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function isPublicIp(ip: string): boolean {
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for (const net of config.allowedPrivateNetworks || []) {
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const cidr = new IPCIDR(net);
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if (cidr.contains(ip)) {
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return true;
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}
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}
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// Workaround because ipaddr.js in the installed version cannot cope
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// with v4mapped addresses. a fix has been submitted and merged, but a new
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// version was not yet released.
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// FIXME: update ipaddr.js and remove workaround
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ip = ip.replace(/^::ffff:(\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3})$/i, '$1');
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try {
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let range = ipaddr.process(ip).range();
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// only unicast or multicast addresses are allowed by default
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// this does not include e.g. loopback addresses
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return ['unicast', 'multicast'].includes(range);
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} catch {
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return false;
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}
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}
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