zcash_keys: Fix a few problems with no-flags compilation.

zcash_keys/CHANGELOG.md

@@ -9,6 +9,11 @@ and this library adheres to Rust's notion of
 ### Added
 - `zcash_keys::keys::UnifiedAddressRequest::all`
 
+### Fixed
+- A missing application of the `sapling` feature flag was remedied; 
+  prior to this fix it was not possible to use this crate without the
+  `sapling` feature enabled.
+
 ## [0.1.0] - 2024-03-01
 The entries below are relative to the `zcash_client_backend` crate as of
 `zcash_client_backend 0.10.0`.

zcash_keys/Cargo.toml

@@ -67,6 +67,7 @@ jubjub.workspace = true
 proptest.workspace = true
 rand_core.workspace = true
 zcash_address = { workspace = true, features = ["test-dependencies"] }
+zcash_primitives = { workspace = true, features = ["test-dependencies"] }
 
 [features]
 ## Enables use of transparent key parts and addresses

zcash_keys/src/address.rs

@@ -143,7 +143,11 @@ impl UnifiedAddress {
 
     /// Returns whether this address has a Sapling receiver.
     pub fn has_sapling(&self) -> bool {
-        self.sapling.is_some()
+        #[cfg(not(feature = "sapling"))]
+        return false;
+
+        #[cfg(feature = "sapling")]
+        return self.sapling.is_some();
     }
 
     /// Returns the Sapling receiver within this Unified Address, if any.
@@ -213,6 +217,7 @@ impl UnifiedAddress {
         let result = std::iter::empty();
         #[cfg(feature = "orchard")]
         let result = result.chain(self.orchard.map(|_| Typecode::Orchard));
+        #[cfg(feature = "sapling")]
         let result = result.chain(self.sapling.map(|_| Typecode::Sapling));
         let result = result.chain(self.transparent.map(|taddr| match taddr {
             TransparentAddress::PublicKeyHash(_) => Typecode::P2pkh,
@@ -353,7 +358,7 @@ mod tests {
     use zcash_address::test_vectors;
     use zcash_primitives::consensus::MAIN_NETWORK;
 
-    use super::Address;
+    use super::{Address, UnifiedAddress};
 
     #[cfg(feature = "sapling")]
     use crate::keys::sapling;
@@ -361,9 +366,6 @@ mod tests {
     #[cfg(any(feature = "orchard", feature = "sapling"))]
     use zcash_primitives::zip32::AccountId;
 
-    #[cfg(any(feature = "orchard", feature = "sapling"))]
-    use super::UnifiedAddress;
-
     #[test]
     #[cfg(any(feature = "orchard", feature = "sapling"))]
     fn ua_round_trip() {

zcash_keys/src/keys.rs

@@ -7,16 +7,16 @@ use zcash_primitives::{
 
 use crate::address::UnifiedAddress;
 
-#[cfg(feature = "transparent-inputs")]
-use zcash_primitives::legacy::keys::NonHardenedChildIndex;
-
 #[cfg(feature = "transparent-inputs")]
 use {
     std::convert::TryInto,
-    zcash_primitives::legacy::keys::{self as legacy, IncomingViewingKey},
+    zcash_primitives::legacy::keys::{self as legacy, IncomingViewingKey, NonHardenedChildIndex},
 };
 
-#[cfg(all(feature = "test-dependencies", feature = "transparent-inputs"))]
+#[cfg(all(
+    feature = "transparent-inputs",
+    any(test, feature = "test-dependencies")
+))]
 use zcash_primitives::legacy::TransparentAddress;
 
 #[cfg(feature = "unstable")]
@@ -847,13 +847,15 @@ pub mod testing {
 
 #[cfg(test)]
 mod tests {
+    use super::UnifiedFullViewingKey;
     use proptest::prelude::proptest;
 
-    use super::UnifiedFullViewingKey;
-    use zcash_primitives::consensus::MAIN_NETWORK;
-
-    #[cfg(any(feature = "orchard", feature = "sapling"))]
-    use zip32::AccountId;
+    #[cfg(any(
+        feature = "orchard",
+        feature = "sapling",
+        feature = "transparent-inputs"
+    ))]
+    use {zcash_primitives::consensus::MAIN_NETWORK, zip32::AccountId};
 
     #[cfg(feature = "sapling")]
     use super::sapling;
@@ -940,7 +942,7 @@ mod tests {
         );
 
         #[cfg(not(any(feature = "orchard", feature = "sapling")))]
-        assert_eq!(ufvk, None);
+        assert!(ufvk.is_none());
 
         #[cfg(any(feature = "orchard", feature = "sapling"))]
         {
@@ -1055,6 +1057,7 @@ mod tests {
 
             // The test vectors contain some diversifier indices that do not generate
             // valid Sapling addresses, so skip those.
+            #[cfg(feature = "sapling")]
             if ufvk.sapling().unwrap().address(d_idx).is_none() {
                 continue;
             }
@@ -1075,6 +1078,7 @@ mod tests {
                     if tvua.transparent().is_some() {
                         assert_eq!(tvua.transparent(), ua.transparent());
                     }
+                    #[cfg(feature = "sapling")]
                     if tvua.sapling().is_some() {
                         assert_eq!(tvua.sapling(), ua.sapling());
                     }