Build fails when resource name contains percent encoded character

[IronGeek]

This might be a bit of an edge cases, but SubresourceIntegrityPlugin cause build to fail when resource name contains percent encoded characters.

This will have a higher chances of happening when SubresourceIntegrityPlugin is used with HtmlWebpackPlugin; since apparently HtmlWebpackPlugin is encoding the resource filenames on purpose (see: jantimon/html-webpack-plugin/issues/1771, and jantimon/html-webpack-plugin/issues/1254)

For example, build will fail with the following webpack configuration:

Here the entry name contains character which will be URL encoded (by HtmlWebpackPlugin), in real-life scenario, the percent encoded names will probably come from user-added resources that is imported somewhere in the project code and pass-through HtmlWebpackPlugin)

const { SubresourceIntegrityPlugin } = require("webpack-subresource-integrity");
const HtmlWebpackPlugin = require("html-webpack-plugin");

module.exports = {
  entry: {
    "why 1+1=2?": "./index.js",
  },
  output: {
    crossOriginLoading: "anonymous",
  },
  plugins: [
    new SubresourceIntegrityPlugin({
      hashFuncNames: ["sha256"],
      enabled: true,
    }),
    new HtmlWebpackPlugin()
  ],
};

assets by status 882 bytes [cached] 2 assets
runtime modules 0 bytes 1 module
./index.js 19 bytes [built] [code generated]

ERROR in   Error: ENOENT: no such file or directory, open '/home/username/some/folder/dist/why%201%2B1%3D2?.js'
  
  - node:fs:602 Object.openSync
    node:fs:602:3
  
  - node:fs:470 readFileSync
    node:fs:470:35
  
  - plugin.js:157 Plugin.processTag
    [issue-xxx]/[webpack-subresource-integrity]/dist/cjs/plugin.js:157:100
  
  - Array.forEach
  
  - plugin.js:185 Plugin.handleHwpBodyTags
    [issue-xxx]/[webpack-subresource-integrity]/dist/cjs/plugin.js:185:39
  
  - index.js:86 SubresourceIntegrityPlugin.<anonymous>
    [issue-xxx]/[webpack-subresource-integrity]/dist/cjs/index.js:86:28
  
  - Generator.next
  
  - index.js:14 
    [issue-xxx]/[webpack-subresource-integrity]/dist/cjs/index.js:14:71
  
  - new Promise
  
  - index.js:10 __awaiter
    [issue-xxx]/[webpack-subresource-integrity]/dist/cjs/index.js:10:12

---

Tested with:

• html-webpack-plugin: 5.5.3
• webpack: 5.88.2
• webpack-subresource-integrity: 5.2.0-rc.1