orb-qr-link: Support UUID for orb-relay comms (#243)

orb-qr-link/src/lib.rs

@@ -30,6 +30,7 @@
 //!     data_policy: DataPolicy::OptOut,
 //!     pcp_version: 2,
 //!     user_centric_signup: true,
+//!     orb_relay_app_id: Some("123123".to_string()),
 //! };
 //!
 //! // Upload `user_data` to the backend by the `session_id` key.
@@ -64,6 +65,7 @@
 //!     data_policy: DataPolicy::OptOut,
 //!     pcp_version: 2,
 //!     user_centric_signup: true,
+//!     orb_relay_app_id: Some("123123".to_string()),
 //! };
 //!
 //! // Verify that the `user_data_hash` from the QR-code matches `user_data`

orb-qr-link/src/user_data.rs

@@ -3,6 +3,9 @@ use serde::{Deserialize, Serialize};
 
 const PCP_VERSION_DEFAULT: u16 = 2;
 
+// TODO(andronat): Some of these flags and types should be refactored (e.g. delete `user_centric_signup`) after both Orb
+// and Worldcoin App are rolled out with their latest versions.
+
 /// User's data to transfer from Worldcoin App to Orb.
 #[derive(Serialize, Deserialize, Debug)]
 #[serde(rename_all = "camelCase")]
@@ -19,6 +22,8 @@ pub struct UserData {
     /// Whether the orb should perform a app-centric signup.
     #[serde(default = "default_false")]
     pub user_centric_signup: bool,
+    /// A unique UUID that the Orb will use to send messages to the app through Orb Relay.
+    pub orb_relay_app_id: Option<String>,
 }
 
 /// User's biometric data policy. Part of [`UserData`].
@@ -61,6 +66,7 @@ impl UserData {
             data_policy,
             pcp_version,
             user_centric_signup,
+            orb_relay_app_id,
         } = self;
         hasher.update(identity_commitment.as_bytes());
         hasher.update(self_custody_public_key.as_bytes());
@@ -71,6 +77,9 @@ impl UserData {
         if *user_centric_signup {
             hasher.update(&[true as u8]);
         }
+        if let Some(app_id) = orb_relay_app_id {
+            hasher.update(app_id.as_bytes());
+        }
     }
 }
 

orb-qr-link/tests/verification.rs

@@ -14,6 +14,7 @@ MCowBQYDK2VuAyEA2boNBmJX4lGkA9kjthS5crXOBxu2BPycKRMakpzgLG4=
         data_policy: DataPolicy::OptOut,
         pcp_version: 3,
         user_centric_signup: true,
+        orb_relay_app_id: Some("123123".to_string()),
     };
     let qr = encode_qr(&session_id, user_data.hash(16));
     let (parsed_session_id, parsed_user_data_hash) = decode_qr(&qr).unwrap();