feat: cktap-swift

.gitignore

@@ -1,3 +1,22 @@
+# Rust
 /target
 /Cargo.lock
+
+# IDE
 /.vscode
+/.idea
+.DS_Store
+
+# Swift
+.build/
+.swiftpm/
+/Packages/
+*.xcodeproj/
+xcuserdata/
+DerivedData/
+.swiftpm/xcode/package.xcworkspace/contents.xcworkspacedata
+*.xcframework/
+*.xcframework.zip
+Info.plist
+Sources
+lib*.a

Cargo.toml

@@ -1,2 +1,11 @@
 [workspace]
-members = ["lib","cli"]
+resolver = "2"
+members = ["lib", "cli"]
+
+[profile.release-smaller]
+inherits = "release"
+opt-level = 'z'
+lto = true
+codegen-units = 1
+panic = "abort"
+strip = true

cktap-swift/.gitignore

@@ -0,0 +1,8 @@
+.DS_Store
+/.build
+/Packages
+xcuserdata/
+DerivedData/
+.swiftpm/configuration/registries.json
+.swiftpm/xcode/package.xcworkspace/contents.xcworkspacedata
+.netrc

cktap-swift/Package.swift

@@ -0,0 +1,31 @@
+// swift-tools-version:5.5
+// The swift-tools-version declares the minimum version of Swift required to build this package.
+
+import PackageDescription
+
+let package = Package(
+    name: "cktap-swift",
+    platforms: [
+        .macOS(.v12),
+        .iOS(.v15)
+    ],
+    products: [
+        .library(
+            name: "CKTap",
+            targets: ["cktapFFI", "CKTap"]),
+    ],
+    dependencies: [],
+    targets: [
+        .binaryTarget(
+            name: "cktapFFI", 
+            path: "./cktapFFI.xcframework"),
+        .target(
+            name: "CKTap",
+            dependencies: ["cktapFFI"]
+        ),
+        .testTarget(
+            name: "CKTapTests",
+            dependencies: ["CKTap"]
+        )
+    ]
+)

cktap-swift/Tests/CKTapTests/CKTapTests.swift

@@ -0,0 +1,10 @@
+import XCTest
+import CKTap
+
+final class CKTapTests: XCTestCase {
+    func testHelloRandom() throws {
+        print("Hello!")
+        let nonce = randNonce()
+        print("Random: \(nonce)")
+    }
+}

cktap-swift/build-xcframework.sh

@@ -0,0 +1,65 @@
+#!/bin/bash
+
+# This script builds local cktap Swift language bindings and corresponding cktapFFI.xcframework.
+
+TARGETDIR="../target"
+OUTDIR="."
+RELDIR="release-smaller"
+NAME="cktapFFI"
+STATIC_LIB_NAME="lib${NAME}.a"
+NEW_HEADER_DIR="../target/include"
+
+# set required rust version and install component and targets
+rustup default 1.77.1
+rustup component add rust-src
+rustup target add aarch64-apple-ios # iOS arm64
+rustup target add x86_64-apple-ios # iOS x86_64
+rustup target add aarch64-apple-ios-sim # simulator mac M1
+rustup target add aarch64-apple-darwin # mac M1
+rustup target add x86_64-apple-darwin # mac x86_64
+
+# Create all required directories first
+mkdir -p Sources/CKTap
+mkdir -p ../target/include
+mkdir -p ../target/lipo-macos/release-smaller
+mkdir -p ../target/lipo-ios-sim/release-smaller
+
+cd ../ || exit
+
+# build cktap-ffi rust lib for apple targets
+cargo build --package rust-cktap --profile release-smaller --target x86_64-apple-darwin
+cargo build --package rust-cktap --profile release-smaller --target aarch64-apple-darwin
+cargo build --package rust-cktap --profile release-smaller --target x86_64-apple-ios
+cargo build --package rust-cktap --profile release-smaller --target aarch64-apple-ios
+cargo build --package rust-cktap --profile release-smaller --target aarch64-apple-ios-sim
+
+# Then run uniffi-bindgen
+cargo run --bin uniffi-bindgen generate \
+    --library target/aarch64-apple-ios/release-smaller/librust_cktap.dylib \
+    --language swift \
+    --out-dir cktap-swift/Sources/CKTap \
+    --no-format
+
+# combine cktap-ffi static libs for aarch64 and x86_64 targets via lipo tool
+lipo target/aarch64-apple-ios-sim/release-smaller/librust_cktap.a target/x86_64-apple-ios/release-smaller/librust_cktap.a -create -output target/lipo-ios-sim/release-smaller/libcktapFFI.a
+
+lipo target/aarch64-apple-darwin/release-smaller/librust_cktap.a target/x86_64-apple-darwin/release-smaller/librust_cktap.a -create -output target/lipo-macos/release-smaller/libcktapFFI.a
+
+cd cktap-swift || exit
+
+# move cktap-ffi static lib header files to temporary directory
+mv "Sources/CKTap/rust_cktapFFI.h" "${NEW_HEADER_DIR}"
+mv "Sources/CKTap/rust_cktapFFI.modulemap" "${NEW_HEADER_DIR}/module.modulemap"
+
+# remove old xcframework directory
+rm -rf "${OUTDIR}/${NAME}.xcframework"
+
+# create new xcframework directory from cktap-ffi static libs and headers
+xcodebuild -create-xcframework \
+    -library "${TARGETDIR}/lipo-macos/${RELDIR}/librust_cktap.a" \
+    -headers "${NEW_HEADER_DIR}" \
+    -library "${TARGETDIR}/aarch64-apple-ios/${RELDIR}/librust_cktap.a" \
+    -headers "${NEW_HEADER_DIR}" \
+    -library "${TARGETDIR}/lipo-ios-sim/${RELDIR}/librust_cktap.a" \
+    -headers "${NEW_HEADER_DIR}" \
+    -output "${OUTDIR}/${NAME}.xcframework"

cktap-swift/justfile

@@ -0,0 +1,11 @@
+default:
+    just --list
+
+build:
+    bash ./build-xcframework.sh
+
+clean:
+    rm -rf ../rust-cktap-ffi/target/
+
+test:
+    swift test

lib/Cargo.toml

@@ -5,6 +5,10 @@ edition = "2021"
 
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
 
+[lib]
+crate-type = ["lib", "staticlib", "cdylib"]
+name = "rust_cktap"
+
 [dependencies]
 ciborium = "0.2.0"
 serde = "1"
@@ -13,6 +17,11 @@ secp256k1 = { version = "0.26.0", features = ["rand-std", "bitcoin-hashes-std",
 
 # optional dependencies
 pcsc = { version = "2", optional = true }
+uniffi = { version = "=0.28.0", features = ["cli"] }
+thiserror = "1.0.58"
+
+[build-dependencies]
+uniffi = { version = "=0.28.0", features = ["build"] }
 
 [features]
 default = []
@@ -21,3 +30,7 @@ emulator = []
 [[example]]
 name = "pcsc"
 required-features = ["pcsc"]
+
+[[bin]]
+name = "uniffi-bindgen"
+path = "src/uniffi-bindgen.rs"

lib/build.rs

@@ -0,0 +1,3 @@
+fn main() {
+    uniffi::generate_scaffolding("src/rust-cktap.udl").expect("Failed to generate FFI scaffolding");
+}

lib/src/lib.rs

@@ -1,3 +1,5 @@
+uniffi::include_scaffolding!("rust-cktap");
+
 extern crate core;
 pub extern crate secp256k1;
 

lib/src/rust-cktap.udl

@@ -0,0 +1,3 @@
+namespace rust_cktap {
+    sequence<u8> rand_nonce();
+};

lib/src/uniffi-bindgen.rs

@@ -0,0 +1,3 @@
+fn main() {
+    uniffi::uniffi_bindgen_main()
+}