node_modules/webpack/lib/schemes/DataUriPlugin.js

   1 /*
   2         MIT License http://www.opensource.org/licenses/mit-license.php
   3         Author Tobias Koppers @sokra
   4 */
   5
   6 "use strict";
   7
   8 const NormalModule = require("../NormalModule");
   9
  10 /** @typedef {import("../Compiler")} Compiler */
  11
  12 // data URL scheme: "data:text/javascript;charset=utf-8;base64,some-string"
  13 // http://www.ietf.org/rfc/rfc2397.txt
  14 const URIRegEx = /^data:([^;,]+)?((?:;[^;,]+)*?)(?:;(base64))?,(.*)$/i;
  15
  16 const decodeDataURI = uri => {
  17         const match = URIRegEx.exec(uri);
  18         if (!match) return null;
  19
  20         const isBase64 = match[3];
  21         const body = match[4];
  22         return isBase64
  23                 ? Buffer.from(body, "base64")
  24                 : Buffer.from(decodeURIComponent(body), "ascii");
  25 };
  26
  27 class DataUriPlugin {
  28         /**
  29          * Apply the plugin
  30          * @param {Compiler} compiler the compiler instance
  31          * @returns {void}
  32          */
  33         apply(compiler) {
  34                 compiler.hooks.compilation.tap(
  35                         "DataUriPlugin",
  36                         (compilation, { normalModuleFactory }) => {
  37                                 normalModuleFactory.hooks.resolveForScheme
  38                                         .for("data")
  39                                         .tap("DataUriPlugin", resourceData => {
  40                                                 const match = URIRegEx.exec(resourceData.resource);
  41                                                 if (match) {
  42                                                         resourceData.data.mimetype = match[1] || "";
  43                                                         resourceData.data.parameters = match[2] || "";
  44                                                         resourceData.data.encoding = match[3] || false;
  45                                                         resourceData.data.encodedContent = match[4] || "";
  46                                                 }
  47                                         });
  48                                 NormalModule.getCompilationHooks(compilation)
  49                                         .readResourceForScheme.for("data")
  50                                         .tap("DataUriPlugin", resource => decodeDataURI(resource));
  51                         }
  52                 );
  53         }
  54 }
  55
  56 module.exports = DataUriPlugin;