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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 { PathType, getType } = 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;
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];
const result = resultSegments.reduceRight((a, b) =>
resolver.join(a, b),
);
/** @type {ResolveRequest} */
const obj = {
...request,
path: result,
};
resolver.doResolve(
target,
obj,
`resolved symlink to ${result}`,
resolveContext,
callback,
);
},
);
});
}
};
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