# bdk-kotlin

This project builds .jar and .aar packages for the `jvm` and `android` platforms that provide 
[Kotlin] language bindings for the [`bdk`] library. The Kotlin language bindings are created by the 
[`bdk-ffi`] project which is included as a git submodule of this repository.

## How to Use

To use the Kotlin language bindings for [`bdk`] in your `jvm` or `android` project add the 
following to your gradle dependencies:
```groovy
repositories {
    mavenCentral()
}

dependencies {
  
  // for jvm
  implementation 'org.bitcoindevkit:bdk-jvm:0.4.0'
  // OR for android
  implementation 'org.bitcoindevkit:bdk-android:0.4.0'
  
}

```

You may then import and use the `org.bitcoindevkit` library in your Kotlin code. For example:

```kotlin
import org.bitcoindevkit.*

// ...

val externalDescriptor = "wpkh([c258d2e4/84h/1h/0h]tpubDDYkZojQFQjht8Tm4jsS3iuEmKjTiEGjG6KnuFNKKJb5A6ZUCUZKdvLdSDWofKi4ToRCwb9poe1XdqfUnP4jaJjCB2Zwv11ZLgSbnZSNecE/0/*)"
val internalDescriptor = "wpkh([c258d2e4/84h/1h/0h]tpubDDYkZojQFQjht8Tm4jsS3iuEmKjTiEGjG6KnuFNKKJb5A6ZUCUZKdvLdSDWofKi4ToRCwb9poe1XdqfUnP4jaJjCB2Zwv11ZLgSbnZSNecE/1/*)"

val databaseConfig = DatabaseConfig.Memory("")

val blockchainConfig =
  BlockchainConfig.Electrum(
    ElectrumConfig("ssl://electrum.blockstream.info:60002", null, 5u, null, 10u)
  )
val wallet = Wallet(externalDescriptor, internalDescriptor, Network.TESTNET, databaseConfig, blockchainConfig)
val newAddress = wallet.getNewAddress()
```

### Example Projects

#### `bdk-android`

* [Devkit Wallet](https://github.com/thunderbiscuit/devkit-wallet)  
* [Padawan Wallet](https://github.com/thunderbiscuit/padawan-wallet)

#### `bdk-jvm`

* [Tatooine Faucet](https://github.com/thunderbiscuit/tatooine)

### How to build

1. Clone this repository and init and update it's [`bdk-ffi`] submodule.
   ```shell
   git clone https://github.com/bitcoindevkit/bdk-kotlin
   git submodule update --init
   ```
1. Follow the "General" bdk-ffi ["Getting Started (Developer)"] instructions.
1. If building on MacOS install required intel and m1 jvm targets
   ```sh
   rustup target add x86_64-apple-darwin aarch64-apple-darwin
   ```
1. Install required targets
    ```sh
    rustup target add x86_64-linux-android aarch64-linux-android armv7-linux-androideabi i686-linux-android
    ```
1. Install `uniffi-bindgen`
    ```sh
    cargo install uniffi_bindgen --version 0.16.0
    ```
    See the [UniFFI User Guide](https://mozilla.github.io/uniffi-rs/) for more info
1. Install Android SDK and Build-Tools for API level 30+
1. Setup `$ANDROID_SDK_ROOT` and `$ANDROID_NDK_HOME` path variables (which are required by the 
   build scripts), for example (NDK major version 21 is required):
    ```shell
    export ANDROID_SDK_ROOT=~/Android/Sdk
    export ANDROID_NDK_HOME=$ANDROID_SDK_ROOT/ndk/21.<NDK_VERSION>
    ```
1. Build kotlin bindings
    ```sh
    ./build.sh
    ```
1. Start android emulator and run tests
   ```sh
   ./gradlew connectedAndroidTest 
   ```

## How to publish

### Publish to your local maven repo

1. Set your `~/.gradle/gradle.properties` signing key values
   ```properties
   signing.gnupg.keyName=<YOUR_GNUPG_ID>
   signing.gnupg.passphrase=<YOUR_GNUPG_PASSPHRASE>
   ```
1. Publish   
   ```shell
   ./gradlew :jvm:publishToMavenLocal
   ./gradlew :android:publishToMavenLocal
   ```

### Publish to maven central with [Gradle Nexus Publish Plugin] (project maintainers only)

1. Set your `~/.gradle/gradle.properties` signing key values and SONATYPE login
   ```properties
   signing.gnupg.keyName=<YOUR_GNUPG_ID>
   signing.gnupg.passphrase=<YOUR_GNUPG_PASSPHRASE>
   
   ossrhUserName=<YOUR_SONATYPE_USERNAME>
   ossrhPassword=<YOUR_SONATYPE_PASSWORD>
   ```
1. Publish
   ```shell
   ./gradlew :jvm:publishToSonatype closeAndReleaseSonatypeStagingRepository
   ./gradlew :android:publishToSonatype closeAndReleaseSonatypeStagingRepository
   ```

[Kotlin]: https://kotlinlang.org/
[Android Studio]: https://developer.android.com/studio/
[`bdk`]: https://github.com/bitcoindevkit/bdk
[`bdk-ffi`]: https://github.com/bitcoindevkit/bdk-ffi
["Getting Started (Developer)"]: https://github.com/bitcoindevkit/bdk-ffi#getting-started-developer
[Gradle Nexus Publish Plugin]: https://github.com/gradle-nexus/publish-plugin