86 lines
3 KiB
JavaScript
86 lines
3 KiB
JavaScript
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/*
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MIT License http://www.opensource.org/licenses/mit-license.php
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*/
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"use strict";
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const RuntimeGlobals = require("../RuntimeGlobals");
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const RuntimeModule = require("../RuntimeModule");
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const Template = require("../Template");
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const JavascriptModulesPlugin = require("../javascript/JavascriptModulesPlugin");
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const { getUndoPath } = require("../util/identifier");
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/** @typedef {import("../Chunk")} Chunk */
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/** @typedef {import("../Compilation")} Compilation */
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class AutoPublicPathRuntimeModule extends RuntimeModule {
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constructor() {
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super("publicPath", RuntimeModule.STAGE_BASIC);
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}
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/**
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* @returns {string | null} runtime code
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*/
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generate() {
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const compilation = /** @type {Compilation} */ (this.compilation);
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const { scriptType, importMetaName, path } = compilation.outputOptions;
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const chunkName = compilation.getPath(
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JavascriptModulesPlugin.getChunkFilenameTemplate(
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/** @type {Chunk} */
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(this.chunk),
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compilation.outputOptions
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),
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{
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chunk: this.chunk,
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contentHashType: "javascript"
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}
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);
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const undoPath = getUndoPath(
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chunkName,
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/** @type {string} */ (path),
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false
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);
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return Template.asString([
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"var scriptUrl;",
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scriptType === "module"
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? `if (typeof ${importMetaName}.url === "string") scriptUrl = ${importMetaName}.url`
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: Template.asString([
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`if (${RuntimeGlobals.global}.importScripts) scriptUrl = ${RuntimeGlobals.global}.location + "";`,
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`var document = ${RuntimeGlobals.global}.document;`,
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"if (!scriptUrl && document) {",
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Template.indent([
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// Technically we could use `document.currentScript instanceof window.HTMLScriptElement`,
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// but an attacker could try to inject `<script>HTMLScriptElement = HTMLImageElement</script>`
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// and use `<img name="currentScript" src="https://attacker.controlled.server/"></img>`
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"if (document.currentScript && document.currentScript.tagName.toUpperCase() === 'SCRIPT')",
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Template.indent("scriptUrl = document.currentScript.src;"),
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"if (!scriptUrl) {",
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Template.indent([
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'var scripts = document.getElementsByTagName("script");',
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"if(scripts.length) {",
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Template.indent([
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"var i = scripts.length - 1;",
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"while (i > -1 && (!scriptUrl || !/^http(s?):/.test(scriptUrl))) scriptUrl = scripts[i--].src;"
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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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]),
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"// When supporting browsers where an automatic publicPath is not supported you must specify an output.publicPath manually via configuration",
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'// or pass an empty string ("") and set the __webpack_public_path__ variable from your code to use your own logic.',
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'if (!scriptUrl) throw new Error("Automatic publicPath is not supported in this browser");',
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'scriptUrl = scriptUrl.replace(/#.*$/, "").replace(/\\?.*$/, "").replace(/\\/[^\\/]+$/, "/");',
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!undoPath
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? `${RuntimeGlobals.publicPath} = scriptUrl;`
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: `${RuntimeGlobals.publicPath} = scriptUrl + ${JSON.stringify(
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undoPath
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)};`
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]);
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}
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}
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module.exports = AutoPublicPathRuntimeModule;
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