马宇豪
2024-07-16 f591c27b57e2418c9495bc02ae8cfff84d35bc18
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/*
    MIT License http://www.opensource.org/licenses/mit-license.php
    Author Tobias Koppers @sokra
*/
 
"use strict";
 
const forEachBail = require("./forEachBail");
const getPaths = require("./getPaths");
const { getType, PathType } = require("./util/path");
 
/** @typedef {import("./Resolver")} Resolver */
/** @typedef {import("./Resolver").ResolveRequest} ResolveRequest */
/** @typedef {import("./Resolver").ResolveStepHook} ResolveStepHook */
 
module.exports = class SymlinkPlugin {
    /**
     * @param {string | ResolveStepHook} source source
     * @param {string | ResolveStepHook} target target
     */
    constructor(source, target) {
        this.source = source;
        this.target = target;
    }
 
    /**
     * @param {Resolver} resolver the resolver
     * @returns {void}
     */
    apply(resolver) {
        const target = resolver.ensureHook(this.target);
        const fs = resolver.fileSystem;
        resolver
            .getHook(this.source)
            .tapAsync("SymlinkPlugin", (request, resolveContext, callback) => {
                if (request.ignoreSymlinks) return callback();
                const pathsResult = getPaths(/** @type {string} */ (request.path));
                const pathSegments = pathsResult.segments;
                const paths = pathsResult.paths;
 
                let containsSymlink = false;
                let idx = -1;
                forEachBail(
                    paths,
                    /**
                     * @param {string} path path
                     * @param {(err?: null|Error, result?: null|number) => void} callback callback
                     * @returns {void}
                     */
                    (path, callback) => {
                        idx++;
                        if (resolveContext.fileDependencies)
                            resolveContext.fileDependencies.add(path);
                        fs.readlink(path, (err, result) => {
                            if (!err && result) {
                                pathSegments[idx] = /** @type {string} */ (result);
                                containsSymlink = true;
                                // Shortcut when absolute symlink found
                                const resultType = getType(result.toString());
                                if (
                                    resultType === PathType.AbsoluteWin ||
                                    resultType === PathType.AbsolutePosix
                                ) {
                                    return callback(null, idx);
                                }
                            }
                            callback();
                        });
                    },
                    /**
                     * @param {null|Error} [err] error
                     * @param {null|number} [idx] result
                     * @returns {void}
                     */
                    (err, idx) => {
                        if (!containsSymlink) return callback();
                        const resultSegments =
                            typeof idx === "number"
                                ? pathSegments.slice(0, idx + 1)
                                : pathSegments.slice();
                        const result = resultSegments.reduceRight((a, b) => {
                            return resolver.join(a, b);
                        });
                        /** @type {ResolveRequest} */
                        const obj = {
                            ...request,
                            path: result
                        };
                        resolver.doResolve(
                            target,
                            obj,
                            "resolved symlink to " + result,
                            resolveContext,
                            callback
                        );
                    }
                );
            });
    }
};