package.lib.schemes.DataUriPlugin.js Maven / Gradle / Ivy

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Packs ECMAScript/CommonJs/AMD modules for the browser. Allows you to split your codebase into multiple bundles, which can be loaded on demand. Supports loaders to preprocess files, i.e. json, jsx, es7, css, less, ... and your custom stuff.

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/*
	MIT License http://www.opensource.org/licenses/mit-license.php
	Author Tobias Koppers @sokra
*/

"use strict";

const NormalModule = require("../NormalModule");

/** @typedef {import("../Compiler")} Compiler */

// data URL scheme: "data:text/javascript;charset=utf-8;base64,some-string"
// http://www.ietf.org/rfc/rfc2397.txt
const URIRegEx = /^data:([^;,]+)?((?:;[^;,]+)*?)(?:;(base64))?,(.*)$/i;

/**
 * @param {string} uri data URI
 * @returns {Buffer|null} decoded data
 */
const decodeDataURI = uri => {
	const match = URIRegEx.exec(uri);
	if (!match) return null;

	const isBase64 = match[3];
	const body = match[4];

	if (isBase64) {
		return Buffer.from(body, "base64");
	}

	// CSS allows to use `data:image/svg+xml;utf8,`
	// so we return original body if we can't `decodeURIComponent`
	try {
		return Buffer.from(decodeURIComponent(body), "ascii");
	} catch (_) {
		return Buffer.from(body, "ascii");
	}
};

class DataUriPlugin {
	/**
	 * Apply the plugin
	 * @param {Compiler} compiler the compiler instance
	 * @returns {void}
	 */
	apply(compiler) {
		compiler.hooks.compilation.tap(
			"DataUriPlugin",
			(compilation, { normalModuleFactory }) => {
				normalModuleFactory.hooks.resolveForScheme
					.for("data")
					.tap("DataUriPlugin", resourceData => {
						const match = URIRegEx.exec(resourceData.resource);
						if (match) {
							resourceData.data.mimetype = match[1] || "";
							resourceData.data.parameters = match[2] || "";
							resourceData.data.encoding = match[3] || false;
							resourceData.data.encodedContent = match[4] || "";
						}
					});
				NormalModule.getCompilationHooks(compilation)
					.readResourceForScheme.for("data")
					.tap("DataUriPlugin", resource => decodeDataURI(resource));
			}
		);
	}
}

module.exports = DataUriPlugin;