1 files changed, 85 insertions, 0 deletions
diff --git a/devtools/client/application/src/modules/application-services.js b/devtools/client/application/src/modules/application-services.js
new file mode 100644
index 0000000000..9188b07f07
--- /dev/null
+++ b/devtools/client/application/src/modules/application-services.js
@@ -0,0 +1,85 @@
+/* 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/. */
+
+"use strict";
+
+// keyword to use in telemetry, as `reason` parameter
+const REASON = "application";
+
+class ManifestDevToolsError extends Error {
+  constructor(...params) {
+    super(...params);
+
+    this.name = "ManifestDevToolsError";
+  }
+}
+
+class ApplicationServices {
+  init(toolbox) {
+    this._toolbox = toolbox;
+
+    this.features = {
+      doesDebuggerSupportWorkers: Services.prefs.getBoolPref(
+        "devtools.debugger.features.windowless-service-workers",
+        false
+      ),
+    };
+  }
+
+  selectTool(toolId) {
+    this._assertInit();
+    return this._toolbox.selectTool(toolId, REASON);
+  }
+
+  async openWorkerInDebugger(workerDescriptorFront) {
+    const debuggerPanel = await this.selectTool("jsdebugger");
+    debuggerPanel.selectServiceWorker(workerDescriptorFront);
+  }
+
+  async viewWorkerSource(workerDescriptorFront) {
+    // NOTE: this falls back to view-source: if the source can't be inspected
+    //       within the debugger.
+    this._toolbox.viewSourceInDebugger(
+      workerDescriptorFront.url,
+      1,
+      1,
+      null,
+      REASON
+    );
+  }
+
+  async fetchManifest() {
+    let response;
+
+    try {
+      this._assertInit();
+      const manifestFront = await this._toolbox.target.getFront("manifest");
+      response = await manifestFront.fetchCanonicalManifest();
+    } catch (error) {
+      throw new ManifestDevToolsError(
+        error.message,
+        error.fileName,
+        error.lineNumber
+      );
+    }
+
+    if (response.errorMessage) {
+      throw new Error(response.errorMessage);
+    }
+
+    return response.manifest;
+  }
+
+  _assertInit() {
+    if (!this._toolbox) {
+      throw new Error("Services singleton has not been initialized");
+    }
+  }
+}
+
+module.exports = {
+  ManifestDevToolsError,
+  // exports a singleton, which will be used across all application panel modules
+  services: new ApplicationServices(),
+};