From a2c04f605cb8372dc5f7902c2f8dd444b90f1399 Mon Sep 17 00:00:00 2001
From: Frederik Rothenberger <frederik.rothenberger@dfinity.org>
Date: Wed, 4 Oct 2023 15:55:22 +0200
Subject: [PATCH] wip

---
 src/internet_identity/internet_identity.did   | 12 +++++++
 src/internet_identity/src/main.rs             | 34 +++++++++++++++++++
 .../src/internet_identity/types/api_v2.rs     | 11 ++++++
 3 files changed, 57 insertions(+)

diff --git a/src/internet_identity/internet_identity.did b/src/internet_identity/internet_identity.did
index 579dec6069..9ae9b9e518 100644
--- a/src/internet_identity/internet_identity.did
+++ b/src/internet_identity/internet_identity.did
@@ -351,6 +351,11 @@ type AuthnMethodRegistrationInfo = record {
     expiration: Timestamp;
 };
 
+type IdentityAuthnInfo = record {
+    authn_methods: vec AuthnMethod;
+    recovery_authn_methods: vec AuthnMethod;
+};
+
 type IdentityInfo = record {
     authn_methods: vec AuthnMethodData;
     authn_method_registration: opt AuthnMethodRegistrationInfo;
@@ -373,6 +378,10 @@ type IdentityRegisterResponse = variant {
     invalid_metadata: text;
 };
 
+type IdentityAuthnInfoResponse = variant {
+    ok: IdentityAuthnInfo;
+};
+
 type IdentityInfoResponse = variant {
     ok: IdentityInfo;
 };
@@ -500,6 +509,9 @@ service : (opt InternetIdentityInit) -> {
     // The sender needs to match the supplied authn_method.
     identity_register: (AuthnMethodData, CaptchaResult, opt principal) -> (opt IdentityRegisterResponse);
 
+    // Returns information about the authentication methods of the identity with the given number.
+    identity_authn_info: (IdentityNumber) -> (opt IdentityAuthnInfoResponse) query;
+
     // Returns information about the identity with the given number.
     // Requires authentication.
     identity_info: (IdentityNumber) -> (opt IdentityInfoResponse);
diff --git a/src/internet_identity/src/main.rs b/src/internet_identity/src/main.rs
index 69a8142d98..9af3f335cf 100644
--- a/src/internet_identity/src/main.rs
+++ b/src/internet_identity/src/main.rs
@@ -505,6 +505,40 @@ fn check_authentication(anchor_number: AnchorNumber) -> Result<(Anchor, DeviceKe
 mod v2_api {
     use super::*;
 
+    #[query]
+    #[candid_method(query)]
+    fn identity_authn_info(identity_number: IdentityNumber) -> Option<IdentityAuthnInfoResponse> {
+        let anchor =
+            state::storage_borrow(|storage| storage.read(identity_number).unwrap_or_default());
+
+        let authn_info = anchor.into_devices().into_iter().fold(
+            IdentityAuthnInfo {
+                authn_methods: vec![],
+                recovery_authn_methods: vec![],
+            },
+            |mut authn_info, device| {
+                let purpose = device.purpose;
+
+                let authn_method = if let Some(credential_id) = device.credential_id {
+                    AuthnMethod::WebAuthn(WebAuthn {
+                        credential_id,
+                        pubkey: device.pubkey,
+                    })
+                } else {
+                    AuthnMethod::PubKey(PublicKeyAuthn {
+                        pubkey: device.pubkey,
+                    })
+                };
+                match purpose {
+                    Purpose::Authentication => authn_info.authn_methods.push(authn_method),
+                    Purpose::Recovery => authn_info.recovery_authn_methods.push(authn_method),
+                }
+                authn_info
+            },
+        );
+        Some(IdentityAuthnInfoResponse::Ok(authn_info))
+    }
+
     #[update]
     #[candid_method]
     async fn captcha_create() -> Option<CaptchaCreateResponse> {
diff --git a/src/internet_identity_interface/src/internet_identity/types/api_v2.rs b/src/internet_identity_interface/src/internet_identity/types/api_v2.rs
index a65090f78c..7a50c29eb8 100644
--- a/src/internet_identity_interface/src/internet_identity/types/api_v2.rs
+++ b/src/internet_identity_interface/src/internet_identity/types/api_v2.rs
@@ -54,6 +54,12 @@ pub struct AuthnMethodRegistration {
     pub authn_method: Option<AuthnMethodData>,
 }
 
+#[derive(Clone, Debug, CandidType, Deserialize, Eq, PartialEq)]
+pub struct IdentityAuthnInfo {
+    pub authn_methods: Vec<AuthnMethod>,
+    pub recovery_authn_methods: Vec<AuthnMethod>,
+}
+
 #[derive(Clone, Debug, CandidType, Deserialize, Eq, PartialEq)]
 pub struct IdentityInfo {
     pub authn_methods: Vec<AuthnMethodData>,
@@ -79,6 +85,11 @@ pub enum IdentityRegisterResponse {
     InvalidMetadata(String),
 }
 
+pub enum IdentityAuthnInfoResponse {
+    #[serde(rename = "ok")]
+    Ok(IdentityAuthnInfo),
+}
+
 #[derive(Clone, Debug, CandidType, Deserialize, Eq, PartialEq)]
 pub enum IdentityInfoResponse {
     #[serde(rename = "ok")]