portal-software

This repository contains the source code for all the software components of the Portal. It's composed of a workspace, plus a separate project (the firmware) since at the time of writing cargo doesn't really like having projects with different targets in the same workspace.

The firmware directory contains the source code of the firmware itself. The firmware depends on both the gui and model crates from the main workspace.

The workspace contains the following crates:

• emulator: The emulator is a binary that can connect to a QEMU instance emulating the firmware and act as either a development UI (emulating display, buttons, etc) or a headless test runner. All the tests for the firmware are actually contained in this crate, in the tests/ subdirectory.
• gui: The GUI crate contains the implementation of the UI for the Portal. It's based on the embedded-graphics crate, and it also contains a small binary called simulator that allows rendering the UI screens on a computer (useful for iterating quickly!).
• model: The model crate contains the definition of all the structs that are sent/received by the Portal in a single package that can be used on both the embedded and host side.
• sdk: The SDK crate implements the communication protocol with the Portal from the host side. It also include an example cli that uses libnfc, so any reader supported by the library should work with it.

There are also a few supporting, secondary crates:

• functional-test-wrapper: This crate implements a very simple proc-macro to wrap the functional tests for the firmware with all the scaffolding required.
• fetch-git-hash: This crate is a very simple proc-macro that expands to the current git hash. It can be used to embed the git hash anywhere in the firmware or SDK.
• dummy-uniffi: This is a crate we need to make the compiler happy when building the SDK without the bindings enabled.

Getting Started

To get started you can try running the firmware on the emulator. You should check the documentation under the emulator directory for all the details, but if you have all the required dependencies installed it should be as easy as running:

cargo emu-dev

from the root directory of the project (this is very important because relative paths are used throughout the codebase!).

This command should first compile the emulator, then the firmware, and then launch a QEMU instance and attach the development GUI to it.

The dependencies you'll need are:

• Nightly cargo (ideally >= 1.76) with both the native (local) and thumbv7em-none-eabihf targets installed
• The C toolchain for ARM-v7 (arm-none-eabi-*)
• Our fork of qemu-system-arm to emulate the firmware
• FLTK to run the emulator GUI
• SDL2 to run the GUI simulator (cargo gui-sim)
• probe-run to flash the firmware to a physical card

NixOS

If you have NixOS or the nix package manager installed you can get a shell with everything installed by running nix develop .#embedded in the root directory of the project.

Docker Environment

We provide two Docker images, one containing the development environment (compiler and tools) and one providing a virtual graphical environment for the emulator.

Assuming you are in the root of the project, you can run the development environment with:

docker image pull afilini/portal-dev-environment:latest

# Start the development environment and mount the portal-software directory into it
docker run -it --rm --mount type=bind,source=$PWD,target=/app afilini/portal-dev-environment:latest
# Enter the app directory, compile the firmware and run the tests through the headless emulator
$ cd /app && cargo emu-test

If you need the full graphical emulator you can combine the dev environment with the other Docker image as such (run this in another terminal):

docker image pull afilini/portal-emulator:latest

# Run the emulator image mapping the locally-build firmware into it
docker run -it --rm --publish 2222:2222 --publish 5900:5900 --mount type=bind,source=$PWD/firmware/,target=/app afilini/portal-emulator:latest run-server --firmware /app/target/thumbv7em-none-eabihf/debug/firmware

With these two environments setup you can run cd firmware && cargo build in the first terminal, then start the emulator with the custom firmware built locally.

Running the Tests

To run the integration tests you can use the command:

cargo emu-test

This will compile emulator and firmware (if it hasn't been done yet) and then run the tests defined in emulator/src/tests. In case of failure it will also create a "report" HTML file that can be inspected in a browser to figure out exactly what went wrong to cause the test to fail.

Building the mobile bindings

Android

Setup

To build the Android bindings first load the nix shell with the fullAndroid option enabled. From the root of the project execute:

nix-shell --arg fullAndroid true

Alternatively you can install manually Rust with a tool like rustup, plus the following targets and cargo-ndk:

rustup target add \
    aarch64-linux-android \
    armv7-linux-androideabi \
    x86_64-linux-android \
    i686-linux-android

cargo install cargo-ndk

Build

Build the library and publish it to the local Maven repo using the following command:

cd ./sdk/libportal-android
./gradlew publishToMavenLocal --exclude-task signMavenPublication

Use

To use the library simply include it in your gradle build file:

repositories {
    mavenLocal()
}

dependencies { 
    implementation("xyz.twenty_two:libportal-android:<version>")
}

iOS

To build the iOS bindings load the nix shell with the withIos option enabled. From the root of the project execute:

nix-shell --arg withIos true

Alternatively you can install manually Rust with a tool like rustup, plus the following targets:

rustup target add \
    aarch64-apple-ios \
    aarch64-apple-ios-sim \
    x86_64-apple-ios

Build

Build the library using the following script:

cd ./sdk/libportal-ios
./build-local-swift.sh

Use

To use the library include the libportal-ios folder as a package dependency. Once this is done you should be able to add the LibPortal library using Xcode. Click on the + button to add a new framework/library and search for LibPortal, which should appear under the libportal-ios package.

React Native

A React Native module is available at ./sdk/libportal-react-native. It depends on the native Kotlin and Swift libraries, so you should build these two first.

Licensing

This project is licensed under GPL 3.0 or later. You can find a full copy of the license in the LICENSE file. For any questions regarding derivative work you can contact us at contact@twenty-two.xyz