Bug 1642606 - Support date tag in search top site override URL. r=mikedeboer

Differential Revision: https://phabricator.services.mozilla.com/D78277

browser/components/newtab/karma.mc.config.js

@@ -87,9 +87,9 @@ module.exports = function(config) {
               branches: 75,
             },
             "lib/TopSitesFeed.jsm": {
-              statements: 97,
-              lines: 97,
-              functions: 100,
+              statements: 96,
+              lines: 96,
+              functions: 97,
               branches: 84,
             },
             "lib/*.jsm": {

browser/components/newtab/lib/TopSitesFeed.jsm

@@ -406,10 +406,20 @@ this.TopSitesFeed = class TopSitesFeed {
     // Insert the original pinned sites into the deduped frecent and defaults
     const withPinned = insertPinned(checkedAdult, pinned).slice(0, numItems);
 
-    const amazonSearchTileOverrideURL = Services.prefs.getStringPref(
+    let amazonSearchTileOverrideURL = Services.prefs.getStringPref(
       AMAZON_SEARCH_TILE_OVERRIDE_PREF,
       ""
     );
+    if (amazonSearchTileOverrideURL) {
+      let date = new Date();
+      let pad = number => number.toString().padStart(2, "0");
+      amazonSearchTileOverrideURL = amazonSearchTileOverrideURL.replace(
+        "%YYYYMMDD%",
+        String(date.getFullYear()) +
+          pad(date.getMonth() + 1) +
+          pad(date.getDate())
+      );
+    }
 
     // Now, get a tippy top icon, a rich icon, or screenshot for every item
     for (const link of withPinned) {