From 8d4ceadad1955743ee667ca38e02039e50f40076 Mon Sep 17 00:00:00 2001
From: Jan Nicklas <j.nicklas@me.com>
Date: Wed, 6 Jan 2021 17:34:55 +0100
Subject: [PATCH] fix: add support for content hash for light and webapp mode

---
 src/hash.js | 69 +++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 69 insertions(+)
 create mode 100644 src/hash.js

diff --git a/src/hash.js b/src/hash.js
new file mode 100644
index 00000000..9324f8ff
--- /dev/null
+++ b/src/hash.js
@@ -0,0 +1,69 @@
+/// @ts-check
+
+// Import types
+/** @typedef {import("webpack").Compilation} WebpackCompilation */
+
+const crypto = require('crypto');
+const url = require('url');
+
+/**
+ * Replaces [contenthash] and [fullhash] inside the given publicPath and assetPath
+ *
+ * @param {WebpackCompilation} compilation
+ * @param {undefined | string | Function} publicPath
+ * @param {string} assetPath
+ */
+function resolvePublicPath(compilation, publicPath, assetPath) {
+  const publicPathString =
+    publicPath && typeof publicPath === 'function'
+      ? compilation.getAssetPath(
+          compilation.outputOptions.publicPath || 'auto',
+          { hash: compilation.hash }
+        )
+      : publicPath;
+
+  const fullAssetPath = url.resolve(
+    appendSlash(publicPathString || 'auto'),
+    assetPath
+  );
+  return fullAssetPath;
+}
+
+/**
+ * Replaces [contenthash] and [fullhash] inside the given publicPath and assetPath
+ *
+ * @param {WebpackCompilation} compilation
+ * @param {string} assetPath
+ * @param {string} hash
+ */
+function replaceContentHash(compilation, assetPath, hash) {
+  return compilation.getAssetPath(assetPath, {
+    hash: compilation.hash || hash,
+    chunk: {
+      id: '1',
+      hash
+    },
+    contentHash: hash
+  });
+}
+
+/**
+ * Adds a slash to a url
+ * @param {string} url
+ */
+function appendSlash(url) {
+  return url && url.length && url.substr(-1, 1) !== '/' ? url + '/' : url;
+}
+
+/**
+ * Returns the content hash for the given file content
+ * @param {Buffer|string} file
+ */
+function getContentHash(file) {
+  return crypto
+    .createHash('sha256')
+    .update(file.toString('utf8'))
+    .digest('hex');
+}
+
+module.exports = { getContentHash, resolvePublicPath, replaceContentHash };