1 files changed, 56 insertions, 0 deletions
diff --git a/chrome/background.js b/chrome/background.js
new file mode 100644
index 0000000..abe6442
--- /dev/null
+++ b/chrome/background.js
@@ -0,0 +1,56 @@
+// Copyright 2017 Google LLC
+//
+// 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
+//
+//     http://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 MENU_ITEM_OPEN_LINK = 'openLink';
+
+function open(url) {
+  chrome.storage.sync.get({clickBehavior: 'search'}, function(items) {
+    let waybackStem = 'https://web.archive.org/web/*/';
+    if (items.clickBehavior == 'direct') {
+      waybackStem = 'https://web.archive.org/web/';
+    }
+    chrome.tabs.update(null, {url: waybackStem + url});
+  });
+}
+
+chrome.action.onClicked.addListener(function(tab) {
+  open(tab.url);
+});
+
+chrome.contextMenus.onClicked.addListener(function(info, tab) {
+  if (info.menuItemId == MENU_ITEM_OPEN_LINK) {
+    open(info.linkUrl);
+  }
+});
+
+chrome.runtime.onInstalled.addListener(function() {
+  chrome.declarativeContent.onPageChanged.removeRules(null, function() {
+    chrome.declarativeContent.onPageChanged.addRules([
+      {
+        conditions: [
+          new chrome.declarativeContent.PageStateMatcher(
+              {pageUrl: {schemes: ['ftp', 'http', 'https']}}),
+        ],
+        actions: [new chrome.declarativeContent.ShowPageAction()],
+      },
+    ]);
+  });
+
+  chrome.contextMenus.create({
+    'id': MENU_ITEM_OPEN_LINK,
+    'title': 'Open link in the Wayback Machine',
+    'contexts': ['link'],
+    'targetUrlPatterns': ['ftp://*/*', 'http://*/*', 'https://*/*'],
+  });
+});