orb-qr-link: Signal user-centric signups (#185)

Signal app-centric signups

orb-qr-link/Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "orb-qr-link"
-version = "0.0.4"
+version = "0.0.5"
 description = "Data link between Worldcoin App and Orb through QR-codes"
 authors = ["Valentyn Valiaiev <valentyn.valiaiev@toolsforhumanity.com>"]
 publish = false

orb-qr-link/src/lib.rs

@@ -28,7 +28,8 @@
 //!     identity_commitment: String::new(),
 //!     self_custody_public_key: String::new(),
 //!     data_policy: DataPolicy::OptOut,
-//!     pcp_version: 2
+//!     pcp_version: 2,
+//!     user_centric_signup: true,
 //! };
 //!
 //! // Upload `user_data` to the backend by the `session_id` key.
@@ -62,6 +63,7 @@
 //!     self_custody_public_key: String::new(),
 //!     data_policy: DataPolicy::OptOut,
 //!     pcp_version: 2,
+//!     user_centric_signup: true,
 //! };
 //!
 //! // Verify that the `user_data_hash` from the QR-code matches `user_data`

orb-qr-link/src/user_data.rs

@@ -16,6 +16,9 @@ pub struct UserData {
     /// Personal Custody Package version.
     #[serde(default = "pcp_version_default")]
     pub pcp_version: u16,
+    /// Whether the app should perform a app-centric signup.
+    #[serde(default = "default_false")]
+    pub user_centric_signup: bool,
 }
 
 /// User's biometric data policy. Part of [`UserData`].
@@ -57,13 +60,17 @@ impl UserData {
             self_custody_public_key,
             data_policy,
             pcp_version,
+            user_centric_signup,
         } = self;
         hasher.update(identity_commitment.as_bytes());
         hasher.update(self_custody_public_key.as_bytes());
         hasher.update(&[*data_policy as u8]);
         if *pcp_version != PCP_VERSION_DEFAULT {
             hasher.update(&pcp_version.to_ne_bytes());
         }
+        if *user_centric_signup {
+            hasher.update(&[true as u8]);
+        }
     }
 }
 
@@ -91,3 +98,7 @@ impl ToString for DataPolicy {
 const fn pcp_version_default() -> u16 {
     PCP_VERSION_DEFAULT
 }
+
+const fn default_false() -> bool {
+    false
+}

orb-qr-link/tests/verification.rs

@@ -13,6 +13,7 @@ MCowBQYDK2VuAyEA2boNBmJX4lGkA9kjthS5crXOBxu2BPycKRMakpzgLG4=
         self_custody_public_key: self_custody_public_key.to_string(),
         data_policy: DataPolicy::OptOut,
         pcp_version: 3,
+        user_centric_signup: true,
     };
     let qr = encode_qr(&session_id, user_data.hash(16));
     let (parsed_session_id, parsed_user_data_hash) = decode_qr(&qr).unwrap();