From a3b9c196f6afa5a4468235174117111fd5f4d1f7 Mon Sep 17 00:00:00 2001
From: Richard Hua <rich@rkhua.com>
Date: Thu, 9 Nov 2023 15:28:33 -0800
Subject: [PATCH] Expose full member

---
 openmls/src/group/mls_group/membership.rs | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)

diff --git a/openmls/src/group/mls_group/membership.rs b/openmls/src/group/mls_group/membership.rs
index 334c9893d4..1a3fab38c7 100644
--- a/openmls/src/group/mls_group/membership.rs
+++ b/openmls/src/group/mls_group/membership.rs
@@ -205,6 +205,23 @@ impl MlsGroup {
             .leaf(leaf_index)
             .map(|leaf| leaf.credential())
     }
+
+    /// Returns the [`Member`] corresponding to the given
+    /// leaf index. Returns `None` if the member can not be found in this group.
+    pub fn member_at(&self, leaf_index: LeafNodeIndex) -> Option<Member> {
+        self.group
+            .public_group()
+            // This will return an error if the member can't be found.
+            .leaf(leaf_index)
+            .map(|leaf_node| {
+                Member::new(
+                    leaf_index,
+                    leaf_node.encryption_key().as_slice().to_vec(),
+                    leaf_node.signature_key().as_slice().to_vec(),
+                    leaf_node.credential().clone(),
+                )
+            })
+    }
 }
 
 /// Helper `enum` that classifies the kind of remove operation. This can be used to