102 lines
2.7 KiB
JavaScript
102 lines
2.7 KiB
JavaScript
/*
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MIT License http://www.opensource.org/licenses/mit-license.php
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Author Tobias Koppers @sokra
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*/
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"use strict";
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const forEachBail = require("./forEachBail");
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const getPaths = require("./getPaths");
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const { PathType, getType } = require("./util/path");
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/** @typedef {import("./Resolver")} Resolver */
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/** @typedef {import("./Resolver").ResolveRequest} ResolveRequest */
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/** @typedef {import("./Resolver").ResolveStepHook} ResolveStepHook */
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module.exports = class SymlinkPlugin {
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/**
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* @param {string | ResolveStepHook} source source
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* @param {string | ResolveStepHook} target target
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*/
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constructor(source, target) {
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this.source = source;
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this.target = target;
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}
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/**
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* @param {Resolver} resolver the resolver
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* @returns {void}
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*/
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apply(resolver) {
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const target = resolver.ensureHook(this.target);
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const fs = resolver.fileSystem;
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resolver
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.getHook(this.source)
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.tapAsync("SymlinkPlugin", (request, resolveContext, callback) => {
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if (request.ignoreSymlinks) return callback();
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const pathsResult = getPaths(/** @type {string} */ (request.path));
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const pathSegments = pathsResult.segments;
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const { paths } = pathsResult;
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let containsSymlink = false;
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let idx = -1;
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forEachBail(
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paths,
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/**
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* @param {string} path path
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* @param {(err?: null|Error, result?: null|number) => void} callback callback
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* @returns {void}
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*/
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(path, callback) => {
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idx++;
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if (resolveContext.fileDependencies) {
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resolveContext.fileDependencies.add(path);
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}
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fs.readlink(path, (err, result) => {
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if (!err && result) {
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pathSegments[idx] = /** @type {string} */ (result);
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containsSymlink = true;
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// Shortcut when absolute symlink found
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const resultType = getType(result.toString());
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if (
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resultType === PathType.AbsoluteWin ||
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resultType === PathType.AbsolutePosix
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) {
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return callback(null, idx);
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}
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}
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callback();
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});
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},
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/**
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* @param {(null | Error)=} err error
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* @param {(null|number)=} idx result
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* @returns {void}
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*/
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(err, idx) => {
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if (!containsSymlink) return callback();
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const resultSegments =
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typeof idx === "number"
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? pathSegments.slice(0, idx + 1)
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: [...pathSegments];
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const result = resultSegments.reduceRight((a, b) =>
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resolver.join(a, b),
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);
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/** @type {ResolveRequest} */
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const obj = {
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...request,
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path: result,
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};
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resolver.doResolve(
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target,
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obj,
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`resolved symlink to ${result}`,
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resolveContext,
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callback,
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);
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},
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);
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});
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}
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};
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