wip: start flattening BackgroundEvent and BackendRequest

Author: iinuwa

credentialsd-common/src/server.rs

@@ -19,6 +19,45 @@ const TAG_VALUE_SIGNATURE: &Signature = &Signature::Structure(Fields::Static {
     fields: &[&Signature::U8, &Signature::Variant],
 });
 
+/// Ceremony completed successfully
+const BACKGROUND_EVENT_CEREMONY_COMPLETED: u32 = 0x01;
+/// Device needs the client PIN to be entered. The backend should collect the
+/// PIN and send it back with `EnterClientPin` event of `UserInteracted` signal.
+const BACKGROUND_EVENT_NEEDS_PIN: u32 = 0x10;
+const BACKGROUND_EVENT_NEEDS_USER_VERIFICATION: u32 = 0x11;
+const BACKGROUND_EVENT_NEEDS_PRESENCE: u32 = 0x12;
+const BACKGROUND_EVENT_SELECTING_CREDENTIAL: u32 = 0x13;
+
+const BACKGROUND_EVENT_HYBRID_IDLE: u32 = 0x20;
+const BACKGROUND_EVENT_HYBRID_STARTED: u32 = 0x21;
+const BACKGROUND_EVENT_HYBRID_CONNECTING: u32 = 0x22;
+const BACKGROUND_EVENT_HYBRID_CONNECTED: u32 = 0x23;
+
+const BACKGROUND_EVENT_NFC_IDLE: u32 = 0x30;
+const BACKGROUND_EVENT_NFC_WAITING: u32 = 0x31;
+const BACKGROUND_EVENT_NFC_SELECTING_DEVICE: u32 = 0x32;
+const BACKGROUND_EVENT_NFC_CONNECTED: u32 = 0x33;
+
+const BACKGROUND_EVENT_USB_IDLE: u32 = 0x41;
+const BACKGROUND_EVENT_USB_WAITING: u32 = 0x42;
+const BACKGROUND_EVENT_USB_SELECTING_DEVICE: u32 = 0x43;
+const BACKGROUND_EVENT_USB_CONNECTED: u32 = 0x44;
+
+const BACKGROUND_EVENT_ERROR_AUTHENTICATOR: u32 = 0x80000001;
+const BACKGROUND_EVENT_ERROR_NO_CREDENTIALS: u32 = 0x80000002;
+const BACKGROUND_EVENT_ERROR_PIN_ATTEMPTS_EXHAUSTED: u32 = 0x80000003;
+const BACKGROUND_EVENT_ERROR_INTERNAL: u32 = 0x80000004;
+const BACKGROUND_EVENT_ERROR_TIMED_OUT: u32 = 0x80000005;
+const BACKGROUND_EVENT_ERROR_CANCELLED: u32 = 0x80000006;
+
+// BackendRequest
+const BACKEND_REQUEST_START_HYBRID_DISCOVERY: u32 = 0x01;
+const BACKEND_REQUEST_START_USB_DISCOVERY: u32 = 0x02;
+const BACKEND_REQUEST_START_NFC_DISCOVERY: u32 = 0x03;
+const BACKEND_REQUEST_ENTER_CLIENT_PIN: u32 = 0x04;
+const BACKEND_REQUEST_SELECT_CREDENTIAL: u32 = 0x05;
+const BACKEND_REQUEST_CANCEL_REQUEST: u32 = 0x06;
+
 impl Type for BackendRequest {
     const SIGNATURE: &'static Signature = TAG_VALUE_SIGNATURE;
 }