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import { webpack, sources } from 'next/dist/compiled/webpack/webpack'
import crypto from 'crypto'
import { SUBRESOURCE_INTEGRITY_MANIFEST } from '../../../shared/lib/constants'
const PLUGIN_NAME = 'SubresourceIntegrityPlugin'
export type SubresourceIntegrityAlgorithm = 'sha256' | 'sha384' | 'sha512'
export class SubresourceIntegrityPlugin {
constructor(private readonly algorithm: SubresourceIntegrityAlgorithm) {}
public apply(compiler: webpack.Compiler) {
compiler.hooks.make.tap(PLUGIN_NAME, (compilation) => {
compilation.hooks.afterProcessAssets.tap(
{
name: PLUGIN_NAME,
stage: webpack.Compilation.PROCESS_ASSETS_STAGE_ADDITIONS,
},
() => {
// Collect all the assets.
let files = new Set<string>()
for (const asset of compilation.getAssets()) {
files.add(asset.name)
}
// For each file, deduped, calculate the file hash.
const hashes: Record<string, string> = {}
for (const file of files.values()) {
// Get the buffer for the asset.
const asset = compilation.getAsset(file)
if (!asset) {
throw new Error(`could not get asset: ${file}`)
}
// Get the buffer for the asset.
const buffer = asset.source.buffer()
// Create the hash for the content.
const hash = crypto
.createHash(this.algorithm)
.update(buffer)
.digest()
.toString('base64')
hashes[file] = `${this.algorithm}-${hash}`
}
const json = JSON.stringify(hashes, null, 2)
const file = 'server/' + SUBRESOURCE_INTEGRITY_MANIFEST
compilation.emitAsset(
file + '.js',
new sources.RawSource(
`self.__SUBRESOURCE_INTEGRITY_MANIFEST=${JSON.stringify(json)}`
// Work around webpack 4 type of RawSource being used
// TODO: use webpack 5 type by default
) as unknown as webpack.sources.RawSource
)
compilation.emitAsset(
file + '.json',
new sources.RawSource(
json
// Work around webpack 4 type of RawSource being used
// TODO: use webpack 5 type by default
) as unknown as webpack.sources.RawSource
)
}
)
})
}
}
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