sigchat

This is the skeleton of a Signal chat application.

The UI and local storage are provided by the xous chat library.

Contributions to development of apps/sigchat and libs/chat are most welcome.

Build

Environment Setup

• clone xous-core: git clone https://github.com/betrusted-io/xous-core.git
• clone sigchat: git clone https://github.com/bunnie/sigchat.git

This creates a directory structure like this:

build directory
├── xous-core
└── sigchat

Manifest Setup

For now, the app manifest has to be set in xous-core by running this command in the xous-core tree:

cargo xtask app-image sigchat

Note: this will fail. That is fine. This is just a matter of creating the manifest entry in the gam. TODO: modify dummy-template to do the same thing without failing to avoid confustion.

Out of Tree Sigchat build

In the sigchat tree, build the binary:

• For hosted: cargo build --release
• For renode/hardware: cargo build --release --target riscv32imac-unknown-xous-elf

Note that you will need to have a GCC compiler installed to build the ring stuff.

When this completes, you should have the ELF executable in target/release/sigchat for hosted or target/riscv32imac-unknown-xous-elf/release/sigchat for renode/hardware

Create a Disk Image

Back in the xous-core tree, finish linking in the binary:

• For hosted: cargo xtask run sigchat:../sigchat/release/sigchat
• For renode/hardware: cargo xtask app-image sigchat:../sigchat/target/riscv32imac-unknown-xous-elf/release/sigchat

Note: for development you may want to clean a copy of the pddb each time you run the app which can be done by running

cp tools/pddb-images/hosted_backup.bin tools/pddb-images/hosted.bin

This should pull the sigchat ELF into the disk image, and attempt to launch it.

Prerequisites:

Functionality

sigchat provides the following basic functionality: *

Structure

The sigchat code is primarily concerned with the Signal specific protocols, while the Chat library handles the UI and pddb storage.

The Chat library provides the UI to display a series of Signal post (Posts) in a Signal group (Dialogue) stored in the pddb. Each Dialogue is stored in the pddb:dict sigchat.dialogue under a descriptive pddb:key (ie ``).

sigchat passes a menu to the Chat UI:

• register to register a new Signal account with a phone number
• link this device to an existing Signal account.

The sigchat servers is set to receive:

• SigchatOp::Post A memory msg containing an outbount user post
• SigchatOp::Event A scalar msg containing important Chat UI events
• sigchat::Menu A scalar msg containing click on a sigchat MenuItem
• SigchatOp::Rawkeys A scalar msg for each keystroke

Troubleshooting

License

This project is dual-licensed under the terms of the AGPL 3.0 license, as a derivative work; and under the terms of the Apache 2.0 license. SPDX-License-Identifier: AGPL-3.0 OR Apache-2.0

You can choose between one of them if you use this work.

• AGPLv3.0
• Apachev2.0

We have a desire to license Sigchat under Apache-2.0 so that elements may be readily incorporated into other future Xous related projects. We are required to license any derivative works of libsignal under the AGPL-3.0 licence.