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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,<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>`
// so we return original body if we can't `decodeURIComponent`
try {
return Buffer.from(decodeURIComponent(body), "ascii");
} catch (_) {
return Buffer.from(body, "ascii");
}
};
const PLUGIN_NAME = "DataUriPlugin";
class DataUriPlugin {
/**
* Apply the plugin
* @param {Compiler} compiler the compiler instance
* @returns {void}
*/
apply(compiler) {
compiler.hooks.compilation.tap(
PLUGIN_NAME,
(compilation, { normalModuleFactory }) => {
normalModuleFactory.hooks.resolveForScheme
.for("data")
.tap(PLUGIN_NAME, resourceData => {
const match = URIRegEx.exec(resourceData.resource);
if (match) {
resourceData.data.mimetype = match[1] || "";
resourceData.data.parameters = match[2] || "";
resourceData.data.encoding = /** @type {"base64" | false} */ (
match[3] || false
);
resourceData.data.encodedContent = match[4] || "";
}
});
NormalModule.getCompilationHooks(compilation)
.readResourceForScheme.for("data")
.tap(PLUGIN_NAME, resource => decodeDataURI(resource));
}
);
}
}
module.exports = DataUriPlugin;