1 files changed, 47 insertions, 0 deletions
diff --git a/components/servo/servo_delegate.rs b/components/servo/servo_delegate.rs
new file mode 100644
index 00000000000..379be8a8513
--- /dev/null
+++ b/components/servo/servo_delegate.rs
@@ -0,0 +1,47 @@
+/* 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 https://mozilla.org/MPL/2.0/. */
+
+use embedder_traits::{WebResourceRequest, WebResourceResponseMsg};
+use ipc_channel::ipc::IpcSender;
+
+use crate::webview_delegate::AllowOrDenyRequest;
+use crate::{Servo, WebView};
+
+#[derive(Clone, Copy, Debug, Hash, PartialEq)]
+pub enum ServoError {
+    /// The channel to the off-the-main-thread web engine has been lost. No further
+    /// attempts to communicate will happen. This is an unrecoverable error in Servo.
+    LostConnectionWithBackend,
+    /// The devtools server, used to expose pages to remote web inspectors has failed
+    /// to start.
+    DevtoolsFailedToStart,
+}
+
+pub trait ServoDelegate {
+    /// Notification that Servo has received a major error.
+    fn notify_error(&self, _servo: &Servo, _error: ServoError) {}
+    /// Report that the DevTools server has started on the given `port`. The `token` that
+    /// be used to bypass the permission prompt from the DevTools client.
+    fn notify_devtools_server_started(&self, _servo: &Servo, _port: u16, _token: String) {}
+    /// Request a DevTools connection from a DevTools client. Typically an embedder application
+    /// will show a permissions prompt when this happens to confirm a connection is allowed.
+    fn request_devtools_connection(&self, _servo: &Servo, _request: AllowOrDenyRequest) {}
+    /// Potentially intercept a resource request. If not handled, the request will not be intercepted.
+    ///
+    /// Note: If this request is associated with a `WebView`,  the `WebViewDelegate` will
+    /// receive this notification first and have a chance to intercept the request.
+    ///
+    /// TODO: This API needs to be reworked to match the new model of how responses are sent.
+    fn intercept_web_resource_load(
+        &self,
+        _webview: Option<WebView>,
+        _request: &WebResourceRequest,
+        response_sender: IpcSender<WebResourceResponseMsg>,
+    ) {
+        let _ = response_sender.send(WebResourceResponseMsg::None);
+    }
+}
+
+pub(crate) struct DefaultServoDelegate;
+impl ServoDelegate for DefaultServoDelegate {}