Initial functionality commit

manifest.json

@@ -0,0 +1,29 @@
+{
+    "manifest_version": 3,
+    "name": "Tab Provenance",
+    "description": "Tells you what site you opened a tab from",
+    "version": "0.1",
+
+    "browser_specific_settings": {
+        "gecko": {
+            "id": "tab-provenance@example.com"
+        }
+    },
+
+    "icons": {
+        "48": "icons/48.png"
+    },
+
+    "background": {
+        "scripts": ["tab_provenance.js"]
+    },
+
+    "permissions": [
+        "tabs",
+        "activeTab",
+        "scripting",
+        "sessions",
+        "menus",
+        "webNavigation"
+    ]
+}

tab_provenance.js

@@ -0,0 +1,53 @@
+console.log("Initializing Tab Provenance");
+const MENU_ID = "get-opening-tab";
+
+browser.runtime.onInstalled.addListener(() => {
+    browser.menus.create({
+        "id": MENU_ID,
+        "title": "What Opened This?",
+        "contexts": ["all"]
+    });
+});
+
+browser.runtime.onStartup.addListener(() => {
+    browser.menus.create({
+        "id": MENU_ID,
+        "title": "What Opened This?",
+        "contexts": ["all"]
+    });
+});
+
+browser.menus.onClicked.addListener(async (info, tab) => {
+    if (info.menuItemId === MENU_ID) {
+        console.log(`Tab id: ${tab.id}`);
+        const target = { "tabId": tab.id };
+        try {
+            const url = await browser.sessions.getTabValue(tab.id, "provenance");
+            console.log(`URL: ${url}`);
+            const alertMsg = (typeof url === "undefined") ? "No opening url found" : `This tab was opened by: ${url}`;
+
+            const func = (alertMsg) => {
+                alert(alertMsg);
+            };
+            const args = [alertMsg];
+            const injectionResult = await browser.scripting.executeScript({target, args, func});
+
+            console.log(injectionResult);
+
+        } catch (err) {
+            console.log(err);
+            await browser.scripting.executeScript({func: () => { alert("Tab not found"); }, target});
+            return;
+        }
+
+    }
+});
+// might want to instead use async functions
+
+browser.webNavigation.onCreatedNavigationTarget.addListener((details) => {
+    browser.tabs.get(details.sourceTabId).then((source) => {
+        browser.sessions.setTabValue(details.tabId,
+            "provenance",
+            source.url) // TODO encode more
+    });
+});