From 90de61f6f28fc17074d0908121262140566318a1 Mon Sep 17 00:00:00 2001
From: Kris Nuttycombe <kris@nutty.land>
Date: Fri, 27 Dec 2024 21:07:27 -0700
Subject: [PATCH] zcash_keys: Add `Address::to_transparent_address`

---
 zcash_keys/CHANGELOG.md   |  1 +
 zcash_keys/src/address.rs | 12 ++++++++++++
 2 files changed, 13 insertions(+)

diff --git a/zcash_keys/CHANGELOG.md b/zcash_keys/CHANGELOG.md
index cabedc12a..014f3d921 100644
--- a/zcash_keys/CHANGELOG.md
+++ b/zcash_keys/CHANGELOG.md
@@ -10,6 +10,7 @@ and this library adheres to Rust's notion of
 - `no-std` compatibility (`alloc` is required). A default-enabled `std` feature
   flag has been added gating the `std::error::Error` usage.
 - `zcash_keys::keys::ReceiverRequirement`
+- `zcash_keys::Address::to_transparent_address`
 
 ### Changed
 - Migrated to `nonempty 0.11`
diff --git a/zcash_keys/src/address.rs b/zcash_keys/src/address.rs
index 15b7fb8fd..3a196ecf9 100644
--- a/zcash_keys/src/address.rs
+++ b/zcash_keys/src/address.rs
@@ -424,6 +424,18 @@ impl Address {
             },
         }
     }
+
+    /// Returns the transparent address corresponding to this address, if it is a transparent
+    /// address, a Unified address with a transparent receiver, or ZIP 320 (TEX) address.
+    pub fn to_transparent_address(&self) -> Option<TransparentAddress> {
+        match self {
+            #[cfg(feature = "sapling")]
+            Address::Sapling(_) => None,
+            Address::Transparent(addr) => Some(*addr),
+            Address::Unified(ua) => ua.transparent().copied(),
+            Address::Tex(addr_bytes) => Some(TransparentAddress::PublicKeyHash(*addr_bytes)),
+        }
+    }
 }
 
 #[cfg(all(