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# Native language bindings for BDK
<p>
<a href="https://github.com/bitcoindevkit/bdk-ffi/blob/master/LICENSE"><img alt="MIT or Apache-2.0 Licensed" src="https://img.shields.io/badge/license-MIT%2FApache--2.0-blue.svg"/></a>
<a href="https://github.com/bitcoindevkit/bdk-ffi/actions?query=workflow%3ACI"><img alt="CI Status" src="https://github.com/bitcoindevkit/bdk-ffi/workflows/CI/badge.svg"></a>
<a href="https://blog.rust-lang.org/2022/05/19/Rust-1.61.0.html"><img alt="Rustc Version 1.61.0+" src="https://img.shields.io/badge/rustc-1.61.0%2B-lightgrey.svg"/></a>
<a href="https://discord.gg/d7NkDKm"><img alt="Chat on Discord" src="https://img.shields.io/discord/753336465005608961?logo=discord"></a>
</p>
The workspace in this repository creates the `libbdkffi` multi-language library for the rust based
[bdk] library from the [Bitcoin Dev Kit] project. The `bdk-ffi-bindgen` package builds a tool for
generating the actual language binding code used to access the `libbdkffi` library.
Each supported language has its own repository that includes this project as a [git submodule].
The rust code in this project is a wrapper around the [bdk] library to expose it's APIs in a
uniform way using the [mozilla/uniffi-rs] bindings generator for each supported target language.
## Supported target languages and platforms
The below repositories include instructions for using, building, and publishing the native
language binding for [bdk] supported by this project.
| Language | Platform | Repository |
| -------- | ------------ | ------------ |
| Kotlin | jvm | [bdk-kotlin] |
| Kotlin | android | [bdk-kotlin] |
| Swift | iOS, macOS | [bdk-swift] |
| Python | linux, macOS | [bdk-python] |
## Language bindings generator tool
Use the `bdk-ffi-bindgen` tool to generate language binding code for the above supported languages.
To run `bdk-ffi-bindgen` and see the available options use the command:
```shell
cargo run -p bdk-ffi-bindgen -- --help
```
[bdk]: https://github.com/bitcoindevkit/bdk
[Bitcoin Dev Kit]: https://github.com/bitcoindevkit
[git submodule]: https://git-scm.com/book/en/v2/Git-Tools-Submodules
[uniffi-rs]: https://github.com/mozilla/uniffi-rs
[bdk-kotlin]: https://github.com/bitcoindevkit/bdk-kotlin
[bdk-swift]: https://github.com/bitcoindevkit/bdk-swift
[bdk-python]: https://github.com/bitcoindevkit/bdk-python
## Contributing
### Adding new structs and functions
See the [UniFFI User Guide](https://mozilla.github.io/uniffi-rs/)
#### For pass by value objects
1. create new rust struct with only fields that are supported UniFFI types
1. update mapping `bdk.udl` file with new `dictionary`
#### For pass by reference values
1. create wrapper rust struct/impl with only fields that are `Sync + Send`
1. update mapping `bdk.udl` file with new `interface`
## Goals
1. Language bindings should feel idiomatic in target languages/platforms
1. Adding new targets should be easy
1. Getting up and running should be easy
1. Contributing should be easy
1. Get it right, then automate
# 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
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
To use the Kotlin language bindings for [`bdk`] in your `jvm` or `android` project add the
following to your gradle dependencies:
```groovy
repositories {
@ -46,7 +116,7 @@ val newAddress = wallet.getNewAddress()
### Example Projects
#### `bdk-android`
* [Devkit Wallet](https://github.com/thunderbiscuit/devkit-wallet)
* [Devkit Wallet](https://github.com/thunderbiscuit/devkit-wallet)
* [Padawan Wallet](https://github.com/thunderbiscuit/padawan-wallet)
#### `bdk-jvm`
@ -70,7 +140,7 @@ rustup target add x86_64-apple-darwin aarch64-apple-darwin
rustup target add x86_64-linux-android aarch64-linux-android armv7-linux-androideabi
```
5. Install Android SDK and Build-Tools for API level 30+
6. Setup `$ANDROID_SDK_ROOT` and `$ANDROID_NDK_ROOT` path variables (which are required by the
6. Setup `$ANDROID_SDK_ROOT` and `$ANDROID_NDK_ROOT` path variables (which are required by the
build tool), for example (NDK major version 21 is required):
```shell
export ANDROID_SDK_ROOT=~/Android/Sdk
@ -138,11 +208,11 @@ sub cv25519 2022-08-31 [E]
2. Download the binary artifacts and corresponding signature files.
- from [bdk-jvm]
- `bdk-jvm-<version>.jar`
- `bdk-jvm-<version>.jar.asc`
- `bdk-jvm-<version>.jar`
- `bdk-jvm-<version>.jar.asc`
- from [bdk-android]
- `bdk-android-<version>.aar`
- `bdk-android-<version>.aar.asc`
- `bdk-android-<version>.aar`
- `bdk-android-<version>.aar.asc`
3. Verify the signatures.
```shell
@ -157,7 +227,7 @@ gpg: Good signature from "bitcoindevkit-bindings <bindings@bitcoindevkit.org>" [
Full key ID: `88AD 93AC 4589 FD09 0FF3 B8D1 2768 C43E 8803 C6A3`
Fingerprint: `2768C43E8803C6A3`
Name: `bitcoindevkit-bindings`
Email: `bindings@bitcoindevkit.org`
Email: `bindings@bitcoindevkit.org`
[Kotlin]: https://kotlinlang.org/
[Android Studio]: https://developer.android.com/studio/
@ -167,3 +237,9 @@ Email: `bindings@bitcoindevkit.org`
[Gradle Nexus Publish Plugin]: https://github.com/gradle-nexus/publish-plugin
[bdk-jvm]: https://search.maven.org/artifact/org.bitcoindevkit/bdk-jvm/0.9.0/jar
[bdk-android]: https://search.maven.org/artifact/org.bitcoindevkit/bdk-android/0.9.0/aar
## Thanks
This project is made possible thanks to the wonderful work by the [mozilla/uniffi-rs] team.
[mozilla/uniffi-rs]: https://github.com/mozilla/uniffi-rs

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# Native language bindings for BDK
<p>
<a href="https://github.com/bitcoindevkit/bdk-ffi/blob/master/LICENSE"><img alt="MIT or Apache-2.0 Licensed" src="https://img.shields.io/badge/license-MIT%2FApache--2.0-blue.svg"/></a>
<a href="https://github.com/bitcoindevkit/bdk-ffi/actions?query=workflow%3ACI"><img alt="CI Status" src="https://github.com/bitcoindevkit/bdk-ffi/workflows/CI/badge.svg"></a>
<a href="https://blog.rust-lang.org/2022/05/19/Rust-1.61.0.html"><img alt="Rustc Version 1.61.0+" src="https://img.shields.io/badge/rustc-1.61.0%2B-lightgrey.svg"/></a>
<a href="https://discord.gg/d7NkDKm"><img alt="Chat on Discord" src="https://img.shields.io/discord/753336465005608961?logo=discord"></a>
</p>
The workspace in this repository creates the `libbdkffi` multi-language library for the rust based
[bdk] library from the [Bitcoin Dev Kit] project. The `bdk-ffi-bindgen` package builds a tool for
generating the actual language binding code used to access the `libbdkffi` library.
Each supported language has its own repository that includes this project as a [git submodule].
The rust code in this project is a wrapper around the [bdk] library to expose it's APIs in a
uniform way using the [mozilla/uniffi-rs] bindings generator for each supported target language.
## Supported target languages and platforms
The below repositories include instructions for using, building, and publishing the native
language binding for [bdk] supported by this project.
| Language | Platform | Repository |
| -------- | ------------ | ------------ |
| Kotlin | jvm | [bdk-kotlin] |
| Kotlin | android | [bdk-kotlin] |
| Swift | iOS, macOS | [bdk-swift] |
| Python | linux, macOS | [bdk-python] |
## Language bindings generator tool
Use the `bdk-ffi-bindgen` tool to generate language binding code for the above supported languages.
To run `bdk-ffi-bindgen` and see the available options use the command:
```shell
cargo run -p bdk-ffi-bindgen -- --help
```
[bdk]: https://github.com/bitcoindevkit/bdk
[Bitcoin Dev Kit]: https://github.com/bitcoindevkit
[git submodule]: https://git-scm.com/book/en/v2/Git-Tools-Submodules
[uniffi-rs]: https://github.com/mozilla/uniffi-rs
[bdk-kotlin]: https://github.com/bitcoindevkit/bdk-kotlin
[bdk-swift]: https://github.com/bitcoindevkit/bdk-swift
[bdk-python]: https://github.com/bitcoindevkit/bdk-python
## Contributing
### Adding new structs and functions
See the [UniFFI User Guide](https://mozilla.github.io/uniffi-rs/)
#### For pass by value objects
1. create new rust struct with only fields that are supported UniFFI types
1. update mapping `bdk.udl` file with new `dictionary`
#### For pass by reference values
1. create wrapper rust struct/impl with only fields that are `Sync + Send`
1. update mapping `bdk.udl` file with new `interface`
## Goals
1. Language bindings should feel idiomatic in target languages/platforms
1. Adding new targets should be easy
1. Getting up and running should be easy
1. Contributing should be easy
1. Get it right, then automate
## Thanks
This project is made possible thanks to the wonderful work by the [mozilla/uniffi-rs] team.
[mozilla/uniffi-rs]: https://github.com/mozilla/uniffi-rs

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This software is licensed under [Apache 2.0](LICENSE-APACHE) or
[MIT](LICENSE-MIT), at your option.
Some files retain their own copyright notice, however, for full authorship
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Except as otherwise noted in individual files, all files in this repository are
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You may not use, copy, modify, merge, publish, distribute, sublicense, and/or
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