74 lines
2.0 KiB
JavaScript
74 lines
2.0 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 NormalModule = require("../NormalModule");
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/** @typedef {import("../Compiler")} Compiler */
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// data URL scheme: "data:text/javascript;charset=utf-8;base64,some-string"
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// http://www.ietf.org/rfc/rfc2397.txt
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const URIRegEx = /^data:([^;,]+)?((?:;[^;,]+)*?)(?:;(base64)?)?,(.*)$/i;
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/**
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* @param {string} uri data URI
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* @returns {Buffer | null} decoded data
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*/
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const decodeDataURI = (uri) => {
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const match = URIRegEx.exec(uri);
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if (!match) return null;
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const isBase64 = match[3];
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const body = match[4];
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if (isBase64) {
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return Buffer.from(body, "base64");
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}
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// CSS allows to use `data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg"><rect width="100%" height="100%" style="stroke: rgb(223,224,225); stroke-width: 2px; fill: none; stroke-dasharray: 6px 3px" /></svg>`
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// so we return original body if we can't `decodeURIComponent`
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try {
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return Buffer.from(decodeURIComponent(body), "ascii");
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} catch (_) {
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return Buffer.from(body, "ascii");
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}
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};
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const PLUGIN_NAME = "DataUriPlugin";
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class DataUriPlugin {
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/**
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* Apply the plugin
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* @param {Compiler} compiler the compiler instance
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* @returns {void}
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*/
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apply(compiler) {
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compiler.hooks.compilation.tap(
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PLUGIN_NAME,
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(compilation, { normalModuleFactory }) => {
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normalModuleFactory.hooks.resolveForScheme
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.for("data")
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.tap(PLUGIN_NAME, (resourceData) => {
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const match = URIRegEx.exec(resourceData.resource);
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if (match) {
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resourceData.data.mimetype = match[1] || "";
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resourceData.data.parameters = match[2] || "";
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resourceData.data.encoding = /** @type {"base64" | false} */ (
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match[3] || false
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);
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resourceData.data.encodedContent = match[4] || "";
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}
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});
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NormalModule.getCompilationHooks(compilation)
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.readResourceForScheme.for("data")
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.tap(PLUGIN_NAME, (resource) => decodeDataURI(resource));
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}
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);
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}
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}
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module.exports = DataUriPlugin;
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