1 files changed, 37 insertions, 0 deletions
diff --git a/node_modules/workbox-build/src/lib/get-composite-details.js b/node_modules/workbox-build/src/lib/get-composite-details.js
new file mode 100644
index 00000000..c59e5128
--- /dev/null
+++ b/node_modules/workbox-build/src/lib/get-composite-details.js
@@ -0,0 +1,37 @@
+/*
+  Copyright 2017 Google Inc.
+
+  Licensed under the Apache License, Version 2.0 (the "License");
+  you may not use this file except in compliance with the License.
+  You may obtain a copy of the License at
+
+      https://www.apache.org/licenses/LICENSE-2.0
+
+  Unless required by applicable law or agreed to in writing, software
+  distributed under the License is distributed on an "AS IS" BASIS,
+  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+  See the License for the specific language governing permissions and
+  limitations under the License.
+*/
+
+const crypto = require('crypto');
+
+module.exports = (compositeUrl, dependencyDetails) => {
+  let totalSize = 0;
+  let compositeHash = '';
+
+  for (let fileDetails of dependencyDetails) {
+    totalSize += fileDetails.size;
+    compositeHash += fileDetails.hash;
+  }
+
+  const md5 = crypto.createHash('md5');
+  md5.update(compositeHash);
+  const hashOfHashes = md5.digest('hex');
+
+  return {
+    file: compositeUrl,
+    hash: hashOfHashes,
+    size: totalSize,
+  };
+};