1 files changed, 61 insertions, 0 deletions
diff --git a/toolkit/components/thumbnails/PageThumbsStorageService.sys.mjs b/toolkit/components/thumbnails/PageThumbsStorageService.sys.mjs
new file mode 100644
index 0000000000..3f29badf9f
--- /dev/null
+++ b/toolkit/components/thumbnails/PageThumbsStorageService.sys.mjs
@@ -0,0 +1,61 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+const THUMBNAIL_DIRECTORY = "thumbnails";
+
+const lazy = {};
+
+ChromeUtils.defineLazyGetter(lazy, "gCryptoHash", function () {
+  return Cc["@mozilla.org/security/hash;1"].createInstance(Ci.nsICryptoHash);
+});
+
+ChromeUtils.defineLazyGetter(lazy, "textEncoder", function () {
+  return new TextEncoder();
+});
+export function PageThumbsStorageService() {}
+
+PageThumbsStorageService.prototype = {
+  classID: Components.ID("{97943eec-0e48-49ef-b7b7-cf4aa0109bb6}"),
+  QueryInterface: ChromeUtils.generateQI(["nsIPageThumbsStorageService"]),
+  // The path for the storage
+  _path: null,
+  get path() {
+    if (!this._path) {
+      this._path = PathUtils.join(
+        PathUtils.localProfileDir,
+        THUMBNAIL_DIRECTORY
+      );
+    }
+    return this._path;
+  },
+
+  getLeafNameForURL(aURL) {
+    if (typeof aURL != "string") {
+      throw new TypeError("Expecting a string");
+    }
+    let hash = this._calculateMD5Hash(aURL);
+    return hash + ".png";
+  },
+
+  getFilePathForURL(aURL) {
+    return PathUtils.join(this.path, this.getLeafNameForURL(aURL));
+  },
+
+  _calculateMD5Hash(aValue) {
+    let hash = lazy.gCryptoHash;
+    let value = lazy.textEncoder.encode(aValue);
+
+    hash.init(hash.MD5);
+    hash.update(value, value.length);
+    return this._convertToHexString(hash.finish(false));
+  },
+
+  _convertToHexString(aData) {
+    let hex = "";
+    for (let i = 0; i < aData.length; i++) {
+      hex += ("0" + aData.charCodeAt(i).toString(16)).slice(-2);
+    }
+    return hex;
+  },
+};