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"use strict";
const path = require("path");
const {
parse
} = require("url");
const querystring = require("querystring");
const getPaths = require("./getPaths");
/** @typedef {import("../index.js").IncomingMessage} IncomingMessage */
/** @typedef {import("../index.js").ServerResponse} ServerResponse */
const cacheStore = new WeakMap();
/**
* @template T
* @param {Function} fn
* @param {{ cache?: Map<string, { data: T }> } | undefined} cache
* @param {(value: T) => T} callback
* @returns {any}
*/
// @ts-ignore
const mem = (fn, {
cache = new Map()
} = {}, callback) => {
/**
* @param {any} arguments_
* @return {any}
*/
const memoized = (...arguments_) => {
const [key] = arguments_;
const cacheItem = cache.get(key);
if (cacheItem) {
return cacheItem.data;
}
let result = fn.apply(void 0, arguments_);
result = callback(result);
cache.set(key, {
data: result
});
return result;
};
cacheStore.set(memoized, cache);
return memoized;
}; // eslint-disable-next-line no-undefined
const memoizedParse = mem(parse, undefined, value => {
if (value.pathname) {
// eslint-disable-next-line no-param-reassign
value.pathname = decode(value.pathname);
}
return value;
});
const UP_PATH_REGEXP = /(?:^|[\\/])\.\.(?:[\\/]|$)/;
/**
* @typedef {Object} Extra
* @property {import("fs").Stats=} stats
* @property {number=} errorCode
*/
/**
* decodeURIComponent.
*
* Allows V8 to only deoptimize this fn instead of all of send().
*
* @param {string} input
* @returns {string}
*/
function decode(input) {
return querystring.unescape(input);
}
/**
* @template {IncomingMessage} Request
* @template {ServerResponse} Response
* @param {import("../index.js").Context<Request, Response>} context
* @param {string} url
* @param {Extra=} extra
* @returns {string | undefined}
*/
function getFilenameFromUrl(context, url, extra = {}) {
const {
options
} = context;
const paths = getPaths(context);
/** @type {string | undefined} */
let foundFilename;
/** @type {URL} */
let urlObject;
try {
// The `url` property of the `request` is contains only `pathname`, `search` and `hash`
urlObject = memoizedParse(url, false, true);
} catch (_ignoreError) {
return;
}
for (const {
publicPath,
outputPath
} of paths) {
/** @type {string | undefined} */
let filename;
/** @type {URL} */
let publicPathObject;
try {
publicPathObject = memoizedParse(publicPath !== "auto" && publicPath ? publicPath : "/", false, true);
} catch (_ignoreError) {
// eslint-disable-next-line no-continue
continue;
}
const {
pathname
} = urlObject;
const {
pathname: publicPathPathname
} = publicPathObject;
if (pathname && pathname.startsWith(publicPathPathname)) {
// Null byte(s)
if (pathname.includes("\0")) {
// eslint-disable-next-line no-param-reassign
extra.errorCode = 400;
return;
} // ".." is malicious
if (UP_PATH_REGEXP.test(path.normalize(`./${pathname}`))) {
// eslint-disable-next-line no-param-reassign
extra.errorCode = 403;
return;
} // Strip the `pathname` property from the `publicPath` option from the start of requested url
// `/complex/foo.js` => `foo.js`
// and add outputPath
// `foo.js` => `/home/user/my-project/dist/foo.js`
filename = path.join(outputPath, pathname.slice(publicPathPathname.length));
try {
// eslint-disable-next-line no-param-reassign
extra.stats =
/** @type {import("fs").statSync} */
context.outputFileSystem.statSync(filename);
} catch (_ignoreError) {
// eslint-disable-next-line no-continue
continue;
}
if (extra.stats.isFile()) {
foundFilename = filename;
break;
} else if (extra.stats.isDirectory() && (typeof options.index === "undefined" || options.index)) {
const indexValue = typeof options.index === "undefined" || typeof options.index === "boolean" ? "index.html" : options.index;
filename = path.join(filename, indexValue);
try {
// eslint-disable-next-line no-param-reassign
extra.stats =
/** @type {import("fs").statSync} */
context.outputFileSystem.statSync(filename);
} catch (__ignoreError) {
// eslint-disable-next-line no-continue
continue;
}
if (extra.stats.isFile()) {
foundFilename = filename;
break;
}
}
}
} // eslint-disable-next-line consistent-return
return foundFilename;
}
module.exports = getFilenameFromUrl;