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/*
MIT License http://www.opensource.org/licenses/mit-license.php
Author Tobias Koppers @sokra
*/
"use strict";
const { SyncBailHook } = require("tapable");
const { CachedSource, CompatSource, RawSource } = require("webpack-sources");
const Compilation = require("../Compilation");
const WebpackError = require("../WebpackError");
const { compareSelect, compareStrings } = require("../util/comparators");
const createHash = require("../util/createHash");
/** @typedef {import("webpack-sources").Source} Source */
/** @typedef {import("../Cache").Etag} Etag */
/** @typedef {import("../Compilation").AssetInfo} AssetInfo */
/** @typedef {import("../Compiler")} Compiler */
/** @typedef {typeof import("../util/Hash")} Hash */
const EMPTY_SET = new Set();
/**
* @template T
* @param {T | T[]} itemOrItems item or items
* @param {Set<T>} list list
*/
const addToList = (itemOrItems, list) => {
if (Array.isArray(itemOrItems)) {
for (const item of itemOrItems) {
list.add(item);
}
} else if (itemOrItems) {
list.add(itemOrItems);
}
};
/**
* @template T
* @param {T[]} input list
* @param {(item: T) => Buffer} fn map function
* @returns {Buffer[]} buffers without duplicates
*/
const mapAndDeduplicateBuffers = (input, fn) => {
// Buffer.equals compares size first so this should be efficient enough
// If it becomes a performance problem we can use a map and group by size
// instead of looping over all assets.
const result = [];
outer: for (const value of input) {
const buf = fn(value);
for (const other of result) {
if (buf.equals(other)) continue outer;
}
result.push(buf);
}
return result;
};
/**
* Escapes regular expression metacharacters
* @param {string} str String to quote
* @returns {string} Escaped string
*/
const quoteMeta = str => str.replace(/[-[\]\\/{}()*+?.^$|]/g, "\\$&");
const cachedSourceMap = new WeakMap();
/**
* @param {Source} source source
* @returns {CachedSource} cached source
*/
const toCachedSource = source => {
if (source instanceof CachedSource) {
return source;
}
const entry = cachedSourceMap.get(source);
if (entry !== undefined) return entry;
const newSource = new CachedSource(CompatSource.from(source));
cachedSourceMap.set(source, newSource);
return newSource;
};
/** @typedef {Set<string>} OwnHashes */
/** @typedef {Set<string>} ReferencedHashes */
/** @typedef {Set<string>} Hashes */
/**
* @typedef {object} AssetInfoForRealContentHash
* @property {string} name
* @property {AssetInfo} info
* @property {Source} source
* @property {RawSource | undefined} newSource
* @property {RawSource | undefined} newSourceWithoutOwn
* @property {string} content
* @property {OwnHashes | undefined} ownHashes
* @property {Promise<void> | undefined} contentComputePromise
* @property {Promise<void> | undefined} contentComputeWithoutOwnPromise
* @property {ReferencedHashes | undefined} referencedHashes
* @property {Hashes} hashes
*/
/**
* @typedef {object} CompilationHooks
* @property {SyncBailHook<[Buffer[], string], string | void>} updateHash
*/
/** @type {WeakMap<Compilation, CompilationHooks>} */
const compilationHooksMap = new WeakMap();
/**
* @typedef {object} RealContentHashPluginOptions
* @property {string | Hash} hashFunction the hash function to use
* @property {string=} hashDigest the hash digest to use
*/
const PLUGIN_NAME = "RealContentHashPlugin";
class RealContentHashPlugin {
/**
* @param {Compilation} compilation the compilation
* @returns {CompilationHooks} the attached hooks
*/
static getCompilationHooks(compilation) {
if (!(compilation instanceof Compilation)) {
throw new TypeError(
"The 'compilation' argument must be an instance of Compilation"
);
}
let hooks = compilationHooksMap.get(compilation);
if (hooks === undefined) {
hooks = {
updateHash: new SyncBailHook(["content", "oldHash"])
};
compilationHooksMap.set(compilation, hooks);
}
return hooks;
}
/**
* @param {RealContentHashPluginOptions} options options
*/
constructor({ hashFunction, hashDigest }) {
this._hashFunction = hashFunction;
this._hashDigest = hashDigest;
}
/**
* Apply the plugin
* @param {Compiler} compiler the compiler instance
* @returns {void}
*/
apply(compiler) {
compiler.hooks.compilation.tap(PLUGIN_NAME, compilation => {
const cacheAnalyse = compilation.getCache(
"RealContentHashPlugin|analyse"
);
const cacheGenerate = compilation.getCache(
"RealContentHashPlugin|generate"
);
const hooks = RealContentHashPlugin.getCompilationHooks(compilation);
compilation.hooks.processAssets.tapPromise(
{
name: PLUGIN_NAME,
stage: Compilation.PROCESS_ASSETS_STAGE_OPTIMIZE_HASH
},
async () => {
const assets = compilation.getAssets();
/** @type {AssetInfoForRealContentHash[]} */
const assetsWithInfo = [];
/** @type {Map<string, [AssetInfoForRealContentHash]>} */
const hashToAssets = new Map();
for (const { source, info, name } of assets) {
const cachedSource = toCachedSource(source);
const content = /** @type {string} */ (cachedSource.source());
/** @type {Hashes} */
const hashes = new Set();
addToList(info.contenthash, hashes);
/** @type {AssetInfoForRealContentHash} */
const data = {
name,
info,
source: cachedSource,
newSource: undefined,
newSourceWithoutOwn: undefined,
content,
ownHashes: undefined,
contentComputePromise: undefined,
contentComputeWithoutOwnPromise: undefined,
referencedHashes: undefined,
hashes
};
assetsWithInfo.push(data);
for (const hash of hashes) {
const list = hashToAssets.get(hash);
if (list === undefined) {
hashToAssets.set(hash, [data]);
} else {
list.push(data);
}
}
}
if (hashToAssets.size === 0) return;
const hashRegExp = new RegExp(
Array.from(hashToAssets.keys(), quoteMeta).join("|"),
"g"
);
await Promise.all(
assetsWithInfo.map(async asset => {
const { name, source, content, hashes } = asset;
if (Buffer.isBuffer(content)) {
asset.referencedHashes = EMPTY_SET;
asset.ownHashes = EMPTY_SET;
return;
}
const etag = cacheAnalyse.mergeEtags(
cacheAnalyse.getLazyHashedEtag(source),
[...hashes].join("|")
);
[asset.referencedHashes, asset.ownHashes] =
await cacheAnalyse.providePromise(name, etag, () => {
const referencedHashes = new Set();
const ownHashes = new Set();
const inContent = content.match(hashRegExp);
if (inContent) {
for (const hash of inContent) {
if (hashes.has(hash)) {
ownHashes.add(hash);
continue;
}
referencedHashes.add(hash);
}
}
return [referencedHashes, ownHashes];
});
})
);
/**
* @param {string} hash the hash
* @returns {undefined | ReferencedHashes} the referenced hashes
*/
const getDependencies = hash => {
const assets = hashToAssets.get(hash);
if (!assets) {
const referencingAssets = assetsWithInfo.filter(asset =>
/** @type {ReferencedHashes} */ (asset.referencedHashes).has(
hash
)
);
const err = new WebpackError(`RealContentHashPlugin
Some kind of unexpected caching problem occurred.
An asset was cached with a reference to another asset (${hash}) that's not in the compilation anymore.
Either the asset was incorrectly cached, or the referenced asset should also be restored from cache.
Referenced by:
${referencingAssets
.map(a => {
const match = new RegExp(`.{0,20}${quoteMeta(hash)}.{0,20}`).exec(
a.content
);
return ` - ${a.name}: ...${match ? match[0] : "???"}...`;
})
.join("\n")}`);
compilation.errors.push(err);
return;
}
const hashes = new Set();
for (const { referencedHashes, ownHashes } of assets) {
if (!(/** @type {OwnHashes} */ (ownHashes).has(hash))) {
for (const hash of /** @type {OwnHashes} */ (ownHashes)) {
hashes.add(hash);
}
}
for (const hash of /** @type {ReferencedHashes} */ (
referencedHashes
)) {
hashes.add(hash);
}
}
return hashes;
};
/**
* @param {string} hash the hash
* @returns {string} the hash info
*/
const hashInfo = hash => {
const assets = hashToAssets.get(hash);
return `${hash} (${Array.from(
/** @type {AssetInfoForRealContentHash[]} */ (assets),
a => a.name
)})`;
};
/** @type {Set<string>} */
const hashesInOrder = new Set();
for (const hash of hashToAssets.keys()) {
/**
* @param {string} hash the hash
* @param {Set<string>} stack stack of hashes
*/
const add = (hash, stack) => {
const deps = getDependencies(hash);
if (!deps) return;
stack.add(hash);
for (const dep of deps) {
if (hashesInOrder.has(dep)) continue;
if (stack.has(dep)) {
throw new Error(
`Circular hash dependency ${Array.from(
stack,
hashInfo
).join(" -> ")} -> ${hashInfo(dep)}`
);
}
add(dep, stack);
}
hashesInOrder.add(hash);
stack.delete(hash);
};
if (hashesInOrder.has(hash)) continue;
add(hash, new Set());
}
/** @type {Map<string, string>} */
const hashToNewHash = new Map();
/**
* @param {AssetInfoForRealContentHash} asset asset info
* @returns {Etag} etag
*/
const getEtag = asset =>
cacheGenerate.mergeEtags(
cacheGenerate.getLazyHashedEtag(asset.source),
Array.from(
/** @type {ReferencedHashes} */ (asset.referencedHashes),
hash => hashToNewHash.get(hash)
).join("|")
);
/**
* @param {AssetInfoForRealContentHash} asset asset info
* @returns {Promise<void>}
*/
const computeNewContent = asset => {
if (asset.contentComputePromise) return asset.contentComputePromise;
return (asset.contentComputePromise = (async () => {
if (
/** @type {OwnHashes} */ (asset.ownHashes).size > 0 ||
[
.../** @type {ReferencedHashes} */ (asset.referencedHashes)
].some(hash => hashToNewHash.get(hash) !== hash)
) {
const identifier = asset.name;
const etag = getEtag(asset);
asset.newSource = await cacheGenerate.providePromise(
identifier,
etag,
() => {
const newContent = asset.content.replace(
hashRegExp,
hash => /** @type {string} */ (hashToNewHash.get(hash))
);
return new RawSource(newContent);
}
);
}
})());
};
/**
* @param {AssetInfoForRealContentHash} asset asset info
* @returns {Promise<void>}
*/
const computeNewContentWithoutOwn = asset => {
if (asset.contentComputeWithoutOwnPromise) {
return asset.contentComputeWithoutOwnPromise;
}
return (asset.contentComputeWithoutOwnPromise = (async () => {
if (
/** @type {OwnHashes} */ (asset.ownHashes).size > 0 ||
[
.../** @type {ReferencedHashes} */ (asset.referencedHashes)
].some(hash => hashToNewHash.get(hash) !== hash)
) {
const identifier = `${asset.name}|without-own`;
const etag = getEtag(asset);
asset.newSourceWithoutOwn = await cacheGenerate.providePromise(
identifier,
etag,
() => {
const newContent = asset.content.replace(
hashRegExp,
hash => {
if (
/** @type {OwnHashes} */
(asset.ownHashes).has(hash)
) {
return "";
}
return /** @type {string} */ (hashToNewHash.get(hash));
}
);
return new RawSource(newContent);
}
);
}
})());
};
const comparator = compareSelect(a => a.name, compareStrings);
for (const oldHash of hashesInOrder) {
const assets =
/** @type {AssetInfoForRealContentHash[]} */
(hashToAssets.get(oldHash));
assets.sort(comparator);
await Promise.all(
assets.map(asset =>
/** @type {OwnHashes} */ (asset.ownHashes).has(oldHash)
? computeNewContentWithoutOwn(asset)
: computeNewContent(asset)
)
);
const assetsContent = mapAndDeduplicateBuffers(assets, asset => {
if (/** @type {OwnHashes} */ (asset.ownHashes).has(oldHash)) {
return asset.newSourceWithoutOwn
? asset.newSourceWithoutOwn.buffer()
: asset.source.buffer();
}
return asset.newSource
? asset.newSource.buffer()
: asset.source.buffer();
});
let newHash = hooks.updateHash.call(assetsContent, oldHash);
if (!newHash) {
const hash = createHash(this._hashFunction);
if (compilation.outputOptions.hashSalt) {
hash.update(compilation.outputOptions.hashSalt);
}
for (const content of assetsContent) {
hash.update(content);
}
const digest = hash.digest(this._hashDigest);
newHash = /** @type {string} */ (digest.slice(0, oldHash.length));
}
hashToNewHash.set(oldHash, newHash);
}
await Promise.all(
assetsWithInfo.map(async asset => {
await computeNewContent(asset);
const newName = asset.name.replace(
hashRegExp,
hash => /** @type {string} */ (hashToNewHash.get(hash))
);
const infoUpdate = {};
const hash = /** @type {string} */ (asset.info.contenthash);
infoUpdate.contenthash = Array.isArray(hash)
? hash.map(
hash => /** @type {string} */ (hashToNewHash.get(hash))
)
: /** @type {string} */ (hashToNewHash.get(hash));
if (asset.newSource !== undefined) {
compilation.updateAsset(
asset.name,
asset.newSource,
infoUpdate
);
} else {
compilation.updateAsset(asset.name, asset.source, infoUpdate);
}
if (asset.name !== newName) {
compilation.renameAsset(asset.name, newName);
}
})
);
}
);
});
}
}
module.exports = RealContentHashPlugin;