Add browser extension gRPC bridge

browser/extension/background.js

@@ -0,0 +1,195 @@
+const ext = globalThis.browser ?? globalThis.chrome;
+const nativeHost = "org.keepassgo.browser";
+const defaultSettings = {
+  grpcAddress: "127.0.0.1:47777",
+  bearerToken: ""
+};
+
+function storageGet(keys) {
+  return new Promise((resolve, reject) => {
+    ext.storage.local.get(keys, (value) => {
+      const error = ext.runtime.lastError;
+      if (error) {
+        reject(new Error(error.message));
+        return;
+      }
+      resolve(value);
+    });
+  });
+}
+
+function storageSet(value) {
+  return new Promise((resolve, reject) => {
+    ext.storage.local.set(value, () => {
+      const error = ext.runtime.lastError;
+      if (error) {
+        reject(new Error(error.message));
+        return;
+      }
+      resolve();
+    });
+  });
+}
+
+function tabsQuery(query) {
+  return new Promise((resolve, reject) => {
+    ext.tabs.query(query, (tabs) => {
+      const error = ext.runtime.lastError;
+      if (error) {
+        reject(new Error(error.message));
+        return;
+      }
+      resolve(tabs);
+    });
+  });
+}
+
+function tabsSendMessage(tabId, message) {
+  return new Promise((resolve, reject) => {
+    ext.tabs.sendMessage(tabId, message, (response) => {
+      const error = ext.runtime.lastError;
+      if (error) {
+        reject(new Error(error.message));
+        return;
+      }
+      resolve(response);
+    });
+  });
+}
+
+function connectNative(message) {
+  return new Promise((resolve, reject) => {
+    ext.runtime.sendNativeMessage(nativeHost, message, (response) => {
+      const error = ext.runtime.lastError;
+      if (error) {
+        reject(new Error(error.message));
+        return;
+      }
+      resolve(response);
+    });
+  });
+}
+
+async function loadSettings() {
+  const stored = await storageGet(["grpcAddress", "bearerToken"]);
+  return {
+    grpcAddress: (stored.grpcAddress || defaultSettings.grpcAddress).trim(),
+    bearerToken: (stored.bearerToken || "").trim()
+  };
+}
+
+async function activePageContext() {
+  const [tab] = await tabsQuery({ active: true, currentWindow: true });
+  return {
+    tabId: tab?.id ?? null,
+    url: typeof tab?.url === "string" ? tab.url : ""
+  };
+}
+
+async function statusForPage() {
+  const settings = await loadSettings();
+  const page = await activePageContext();
+  if (!settings.bearerToken) {
+    return {
+      success: false,
+      configured: false,
+      status: null,
+      pageUrl: page.url,
+      matches: [],
+      error: "Set an API token in extension settings."
+    };
+  }
+
+  const status = await connectNative({
+    action: "status",
+    grpcAddress: settings.grpcAddress,
+    bearerToken: settings.bearerToken
+  });
+  if (!status.success || status.status?.locked || !page.url.startsWith("http")) {
+    return {
+      success: status.success,
+      configured: true,
+      status: status.status ?? null,
+      pageUrl: page.url,
+      matches: [],
+      error: status.error ?? ""
+    };
+  }
+
+  const matches = await connectNative({
+    action: "find-logins",
+    grpcAddress: settings.grpcAddress,
+    bearerToken: settings.bearerToken,
+    url: page.url
+  });
+  return {
+    success: matches.success,
+    configured: true,
+    status: matches.status ?? status.status ?? null,
+    pageUrl: page.url,
+    matches: matches.matches ?? [],
+    error: matches.error ?? ""
+  };
+}
+
+async function fillLogin(entryId) {
+  const settings = await loadSettings();
+  const page = await activePageContext();
+  if (!settings.bearerToken) {
+    throw new Error("API token is not configured.");
+  }
+  if (page.tabId == null) {
+    throw new Error("No active tab is available.");
+  }
+
+  const response = await connectNative({
+    action: "get-login",
+    grpcAddress: settings.grpcAddress,
+    bearerToken: settings.bearerToken,
+    entryId,
+    url: page.url
+  });
+  if (!response.success || !response.credential) {
+    throw new Error(response.error || "KeePassGO did not return a credential.");
+  }
+
+  const fillResponse = await tabsSendMessage(page.tabId, {
+    type: "keepassgo-fill-credential",
+    credential: response.credential
+  });
+  if (!fillResponse?.ok) {
+    throw new Error(fillResponse?.error || "The current page could not be filled.");
+  }
+  return {
+    credential: response.credential,
+    pageUrl: page.url
+  };
+}
+
+ext.runtime.onMessage.addListener((message, _sender, sendResponse) => {
+  (async () => {
+    switch (message?.type) {
+      case "keepassgo-popup-state":
+        sendResponse(await statusForPage());
+        return;
+      case "keepassgo-fill-entry":
+        sendResponse({ success: true, ...(await fillLogin(message.entryId)) });
+        return;
+      case "keepassgo-load-settings":
+        sendResponse({ success: true, settings: await loadSettings() });
+        return;
+      case "keepassgo-save-settings":
+        await storageSet({
+          grpcAddress: String(message.settings?.grpcAddress || defaultSettings.grpcAddress).trim(),
+          bearerToken: String(message.settings?.bearerToken || "").trim()
+        });
+        sendResponse({ success: true });
+        return;
+      default:
+        sendResponse({ success: false, error: `Unsupported message ${message?.type || ""}`.trim() });
+    }
+  })().catch((error) => {
+    sendResponse({ success: false, error: error instanceof Error ? error.message : String(error) });
+  });
+  return true;
+});