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# Ğ1 <-> Luanti bridge
Luanti mod to exchange in-game [currency](https://github.com/mt-mods/currency) with [libre currency](https://duniter.org) (Ğ1 blockchain).
Luanti server has a dedicated account.
Player transfer money on it and the server gives them a corresponding amount of in-game banknotes.
They can then do whatever they want with the banknotes (trade, decorate walls, burn...).
Players can ask the server to transfer their banknotes to an account of their choice using a chat command.
It works with Ğ1v2 which is still in development/testing phase.
## Install
Put this repo in the `mods` directory.
Have a local Duniter node.
```bash
cargo build --release
./target/release/g1bridge -l -d /path/to/database -s ../sk
```
* `sk` contains the server's secret key
* Without `-l`, use Substrate formats.
* With `-l`, use legacy Ğ1 format on 2 lines (one password per line).
* `database` is the directory where the bridge will save its database. It is used to store debts in case of failure of a transfer.
## ToDo
* Blockchain-to-game transfers
* Ensure all transfers are failproof (any communication, storage medium, server or whatever should be able to fail or rollback to a previous state, without causing double spend or money loss)
* Force reception account to exist
* Nice ATM-like interface
## Workflow
### game -> blockchain
1. Player issues command `/g1_send <amount> <address>`
2. Mod takes currency from inventory and saves the debt in storage.
3. Mod sends `/send/<address>/<amount>` to bridge.
4.
* If bridge responds immediately, clean the debt.
* Else, retry later.
### blockchain -> game
1. bridge listens to events
2. on reception event, bridge stores debt
3. Player issues command `/g1_claim`
4. Mod sends `/claim/<player>` to bridge
5. Bridge answers an amount and clears debt
6. Mod stores debt
7. Mod tries to give player MG
8. What does not fit is kept in debt. What does fit is removed from debt.
## License
[Support me via LiberaPay](https://liberapay.com/tuxmain/donate)
GNU AGPL v3, CopyLeft 2025 Pascal Engélibert [(why copyleft?)](https://txmn.tk/blog/why-copyleft/)
This program is free software: you can redistribute it and/or modify it under the terms of the GNU Affero General Public License as published by the Free Software Foundation, version 3 of the License.
This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Affero General Public License for more details.
You should have received a copy of the GNU Affero General Public License along with this program. If not, see https://www.gnu.org/licenses/.

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/target

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[package]
name = "g1bridge"
version = "0.1.0"
edition = "2024"
[dependencies]
argp = "0.4.0"
codec = { package = "parity-scale-codec", version = "3.6.12" }
log = "0.4.27"
scrypt = { version = "0.11.0", default-features = false }
serde = { version = "1.0.219", features = ["derive"] }
simplelog = "0.12.2"
sp-core = { git = "https://github.com/duniter/duniter-polkadot-sdk.git", branch = "duniter-substrate-v1.11.0" }
sp-runtime = { git = "https://github.com/duniter/duniter-polkadot-sdk.git", branch = "duniter-substrate-v1.11.0" }
subxt = { git = 'https://github.com/duniter/subxt', branch = 'subxt-v0.35.3-duniter-substrate-v1.11.0', default-features = false, features = [
"substrate-compat",
"native",
"jsonrpsee",
] }
tiny_http = "0.12.0"
tokio = { version = "1.38.0", features = ["macros", "rt-multi-thread"] }
typed-sled = "0.2.3"
[profile.release]
lto = "fat"

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hard_tabs = true
newline_style = "Unix"
imports_granularity = "Crate"
unstable_features = true
format_code_in_doc_comments = true
format_macro_bodies = true
format_macro_matchers = true
format_strings = true

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use crate::{DebtG2B, Opt};
use log::error;
use runtime::balances::calls::types::TransferKeepAlive;
use subxt::{
OnlineClient,
backend::{Backend, BackendExt},
ext::sp_core::{
Pair as _,
ed25519::{Pair, Public},
},
tx::{PairSigner, Signer},
};
use tokio::sync::mpsc::Receiver;
use typed_sled::Tree;
#[subxt::subxt(
runtime_metadata_path = "res/metadata.scale",
derive_for_all_types = "Debug"
)]
pub mod runtime {}
pub type Client = subxt::OnlineClient<Runtime>;
pub type AccountId = subxt::utils::AccountId32;
pub type IdtyId = u32;
pub type BlockNumber = u32;
pub type TxProgress = subxt::tx::TxProgress<Runtime, Client>;
pub type Balance = u64;
pub type AccountData =
runtime::runtime_types::pallet_duniter_account::types::AccountData<Balance, IdtyId>;
pub type AccountInfo = runtime::runtime_types::frame_system::AccountInfo<u32, AccountData>;
pub type Hash = sp_core::H256;
// declare runtime types
pub enum Runtime {}
impl subxt::config::Config for Runtime {
type AssetId = ();
type Hash = Hash;
type AccountId = AccountId;
type Address = sp_runtime::MultiAddress<Self::AccountId, u32>;
type Signature = sp_runtime::MultiSignature;
type Hasher = subxt::config::substrate::BlakeTwo256;
type Header = subxt::config::substrate::SubstrateHeader<BlockNumber, Self::Hasher>;
type ExtrinsicParams = subxt::config::DefaultExtrinsicParams<Self>;
}
#[derive(Copy, Clone, Debug, Default, codec::Encode)]
pub struct Tip {
#[codec(compact)]
tip: u64,
}
impl Tip {
pub fn new(amount: u64) -> Self {
Tip { tip: amount }
}
}
impl From<u64> for Tip {
fn from(n: u64) -> Self {
Self::new(n)
}
}
pub enum Msg {
NewDebt,
Timer,
}
pub async fn run(
url: String,
pair: Pair,
mut recv: Receiver<DebtG2B>,
tree_debt_g2b: Tree<DebtG2B, ()>,
) {
let mut client = OnlineClient::<Runtime>::from_url(&url).await.ok();
while let Some(msg) = recv.recv().await {
if client.is_none() {
client = OnlineClient::<Runtime>::from_url(&url).await.ok();
}
if let Some(client) = &client {
match client
.tx()
.sign_and_submit_then_watch_default(
&runtime::tx().balances().transfer_keep_alive(
subxt::utils::MultiAddress::Id(msg.address.clone()),
msg.amount,
),
&subxt::tx::PairSigner::new(pair),
)
.await
{
Ok(_) => {
tree_debt_g2b.remove(&msg).ok();
}
Err(e) => {
error!("Submitting transaction: {e:?}");
}
}
}
}
}

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#![feature(try_blocks)]
mod blockchain;
use argp::FromArgs;
use serde::{Deserialize, Serialize, de};
use sp_core::Pair as _;
use std::{
io::{BufRead, Read},
str::FromStr,
sync::Arc,
};
use subxt::{
ext::sp_core::ed25519::{Pair, Public},
utils::{AccountId32, MultiAddress},
};
use tiny_http::{Response, ResponseBox, Server, ServerConfig};
use tokio::sync::mpsc::{Sender, channel};
use typed_sled::Tree;
/// Game to Blockchain
const TREE_DEBT_G2B: &'static str = "debt_g2b";
/// Blob
#[derive(FromArgs)]
struct Opt {
/// path to the database
#[argp(option, short = 'd')]
db: String,
/// secret key is legacy (two passwords on the two first lines)
#[argp(switch, short = 'l')]
legacy: bool,
/// path to the file containing the secret key in Substrate format
#[argp(option, short = 's')]
secret_key: String,
/// duniter node URL (default: ws://127.0.0.1:9944)
#[argp(option, short = 'u', default = "String::from(\"ws://127.0.0.1:9944\")")]
url: String,
}
#[derive(Deserialize, Serialize)]
struct DebtG2B {
address: AccountId32,
amount: u64,
}
#[tokio::main]
async fn main() {
let opt: Opt = argp::parse_args_or_exit(argp::DEFAULT);
let mut sk_file = std::fs::File::open(opt.secret_key).expect("Cannot open secret key file");
let pair: Pair = if opt.legacy {
let sk_reader = std::io::BufReader::new(sk_file);
let mut sk_lines = sk_reader.lines();
let psw1 = sk_lines
.next()
.expect("Secret key file should contain at least 2 lines for the 2 passwords")
.unwrap();
let psw2 = sk_lines
.next()
.expect("Secret key file should contain at least 2 lines for the 2 passwords")
.unwrap();
let params = scrypt::Params::new(12, 16, 1, 32).unwrap();
let mut seed = [0u8; 32];
scrypt::scrypt(
psw2.trim().as_bytes(),
psw1.trim().as_bytes(),
&params,
&mut seed,
)
.unwrap();
Pair::from_seed(&seed)
} else {
let mut sk_content = String::new();
sk_file
.read_to_string(&mut sk_content)
.expect("Cannot read secret key file");
Pair::from_string(sk_content.trim(), None).expect("Cannot decode secret key")
};
simplelog::SimpleLogger::init(log::LevelFilter::Debug, simplelog::Config::default()).unwrap();
let db = typed_sled::open(opt.db).expect("Cannot open database");
let tree_debt_g2b = Tree::<DebtG2B, ()>::open(&db, TREE_DEBT_G2B);
let (bc_send, bc_recv) = channel(128);
tokio::spawn(blockchain::run(
opt.url,
pair,
bc_recv,
tree_debt_g2b.clone(),
));
let server = Server::http("127.0.0.1:30061").expect("Cannot start server");
struct Locals {
tree_debt_g2b: Tree<DebtG2B, ()>,
bc_send: Sender<DebtG2B>,
}
tokio::task_local! {
static LOCALS: Arc<Locals>;
};
LOCALS.scope(
Arc::new(Locals {
tree_debt_g2b,
bc_send,
}),
async move {
for request in server.incoming_requests() {
let locals = LOCALS.get();
tokio::spawn(async move {
let url = request.url();
let mut url_items = url.split('/').filter(|item| !item.is_empty());
let resp: Option<ResponseBox> = try {
match url_items.next() {
Some("send") => {
let address = AccountId32::from_str(url_items.next()?).ok()?;
let amount = url_items.next()?.parse::<u64>().ok()?;
println!("{address} {amount}");
let debt = DebtG2B { address, amount };
locals.tree_debt_g2b.insert(&debt, &()).ok()?;
locals.bc_send.send(debt).await.ok()?;
Response::empty(200).boxed()
}
_ => None?,
}
};
if let Some(resp) = resp {
request.respond(resp).ok();
} else {
request.respond(Response::empty(400)).ok();
}
});
}
},
).await;
}

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local http = minetest.request_http_api()
if http == nil then
error("Please add g1_bridge to secure.http_mods")
end
minetest.register_chatcommand("g1", {
func = function(name, param)
local args = {}
for arg in string.gmatch(param,"%S+") do
if #args >= 3 then
break
end
table.insert(args, arg)
end
if #args >= 1 then
core.chat_send_player(name, "args >= 1")
if args[1] == "send" and #args == 3 and string.find(args[2],"^[%da-zA-Z]+$") and string.find(args[3],"^%d+$") then
local address = args[2]
local amount = tonumber(args[3])
-- This version Lua does not have any way to check if a number is represented as an integer or a float,
-- because it explicitely doesn't care.
-- Hence, this program won't care if the player writes an invalid number,
-- as there is no need to ensure arithmetic rules are respected. (as Lua's manual pretends)
-- As the pattern excludes "." and nobody should have billions of items,
-- it should still be safe. I hope.
if type(amount) ~= "number" then
return
end
local inv = core.get_inventory({type="player", name=name})
local wanted_stack = "currency:minegeld "..amount
local balanced = inv:contains_item("main", ItemStack(wanted_stack))
if balanced then
inv:remove_item("main", wanted_stack)
http.fetch({url="http://127.0.0.1:30061/send/"..address.."/"..amount, method="GET"},
function(res)
if res.code == 200 then
core.chat_send_player(name, "Transfer sent")
else
core.chat_send_player(name, "Error during transfer")
end
end
)
else
core.chat_send_player(name, "Not enough currency")
end
end
end
end
})

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name = g1_bridge
description = Bridge to exchange in-game MineGeld with libre currency G1
depends = currency