Create cargo vanadium app

.cargo/config.toml

···
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+]

.gitignore

···
+target/

Cargo.lock

···
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+version = "0.0.1"
+authors = ["Edouard Paris <[e-mail]>"]
+edition = "2024"
+description = "Vanadium app for atproto plc"
+
+[package.metadata.vapp]
+name = "Atproto"
+stack_size = 65536
+
+[dependencies]
+serde_ipld_dagcbor = { git = "http://github.com/edouardparis/serde_ipld_dagcbor", branch = "scopeguard-no-default-features", default-features = false }
+sdk = { package = "vanadium-app-sdk", git = "https://github.com/LedgerHQ/vanadium"}
+common = { package = "vnd-atproto-common", path = "common" }
+base58 = "0.2.0"
+serde = { version = "1.0", default-features = false, features = ["alloc"] }
+
+[patch.crates-io]
+cid = { git = "https://github.com/edouardparis/rust-cid", branch = "fix-dep-serde_bytes-features" }
+
+[dev-dependencies]
+hex-literal = "0.4.1"
+
+[workspace]
+resolver = "2"
+members = [
+    ".",
+    "common",
+    "client",
+    "cli",
+]

README.md

···
+# Vanadium application for Atproto
+
+
+cargo install --git https://github.com/LedgerHQ/vanadium cargo-vnd

cli/Cargo.toml

···
+[package]
+name = "vnd-atproto-cli"
+version = "0.0.1"
+edition = "2021"
+
+[dependencies]
+base58 = "0.2.0"
+client = { package = "vnd-atproto-client", path = "../client"}
+clap = { version = "4.5.31", features = ["derive"] }
+rustyline = "15.0.0"
+shellwords = "1.1.0"
+hidapi = "2.6.3"
+ledger-transport-hid = "0.11.0"
+serde = { version = "1.0", default-features = false, features = ["alloc", "derive"] }
+tokio = { version = "1.38.1", features = ["io-util", "macros", "net", "rt", "rt-multi-thread", "sync"] }
+

cli/history.txt

···
+#V2
+help
+get_did_key key_index=0 display=true
+get_did_key
+get_did_key --key_index 0
+get_did_key key_index=0
+get_key_index
+get_did_key
+exit
+get_key_index
+get_did_key

cli/src/main.rs

···
+use base58::ToBase58;
+use clap::{CommandFactory, Parser, Subcommand};
+use rustyline::completion::{Completer, Pair};
+use rustyline::error::ReadlineError;
+use rustyline::highlight::{CmdKind, Highlighter};
+use rustyline::hint::Hinter;
+use rustyline::validate::{ValidationContext, ValidationResult, Validator};
+use rustyline::{Context, Editor, Helper};
+
+use hidapi::HidApi;
+use ledger_transport_hid::TransportNativeHID;
+
+use client::{
+    transport::{Transport, TransportHID, TransportTcp, TransportWrapper},
+    vanadium_client::{NativeAppClient, VanadiumAppClient},
+    AtprotoAppClient,
+};
+
+use std::borrow::Cow;
+use std::sync::Arc;
+
+#[derive(Parser, Debug)]
+#[command(name = "vnd-bitcoin-cli")]
+struct Cli {
+    #[clap(subcommand)]
+    command: CliCommand,
+}
+
+#[derive(Subcommand, Debug)]
+#[clap(rename_all = "snake_case")]
+enum CliCommand {
+    GetDidKey {
+        #[clap(long)]
+        key_index: Option<u32>,
+        #[clap(long, default_missing_value = "true", num_args = 0..=1)]
+        display: bool,
+    },
+    Exit,
+}
+
+// Command completer
+struct CommandCompleter;
+
+impl CommandCompleter {
+    fn get_current_word<'a>(&self, line: &'a str, pos: usize) -> (usize, &'a str) {
+        let before = &line[..pos];
+        // Find the last space before the cursor; if none, start at 0
+        let start = before.rfind(' ').map_or(0, |i| i + 1);
+        let word = &line[start..pos];
+        (start, word)
+    }
+}
+
+fn make_pair(s: &str) -> Pair {
+    Pair {
+        display: s.to_string(),
+        replacement: s.to_string(),
+    }
+}
+
+impl Completer for CommandCompleter {
+    type Candidate = Pair;
+
+    fn complete(
+        &self,
+        line: &str,
+        pos: usize,
+        _ctx: &Context<'_>,
+    ) -> rustyline::Result<(usize, Vec<Pair>)> {
+        let prefix = line[..pos].trim_start();
+
+        // Case 1: Empty input, suggest all subcommands
+        if prefix.is_empty() || !prefix.contains(' ') {
+            let suggestions = Cli::command()
+                .get_subcommands()
+                .filter(|cmd| cmd.get_name().starts_with(prefix))
+                .map(|cmd| make_pair(cmd.get_name()))
+                .collect();
+            return Ok((0, suggestions));
+        }
+
+        // Case 3: Subcommand present; suggest possible arguments to complete the command
+        let subcmd_name = prefix.split_whitespace().next().unwrap();
+        if let Some(subcmd) = Cli::command().find_subcommand(subcmd_name) {
+            let (start, _) = self.get_current_word(line, pos);
+
+            // Collect arguments already present in the line before the cursor
+            let Ok(present_args) = shellwords::split(&line[..start].trim_end()) else {
+                return Ok((0, vec![])); // no suggestions if we can't parse the line
+            };
+
+            // replace `argument=some_value` with just `argument` for each of present_args
+            let present_args: Vec<String> = present_args
+                .into_iter()
+                .map(|arg| arg.split('=').next().unwrap().to_string())
+                .collect();
+
+            // Get all argument continuations
+            let suggestions = subcmd
+                .get_arguments()
+                .filter_map(|arg| arg.get_long().map(|l| l.to_string()))
+                .filter(|arg| !present_args.contains(arg))
+                .map(|arg| Pair {
+                    display: arg.clone(),
+                    replacement: arg,
+                })
+                .collect();
+            return Ok((start, suggestions));
+        }
+
+        // Default case: no suggestions
+        Ok((0, vec![]))
+    }
+}
+
+impl Validator for CommandCompleter {
+    fn validate(
+        &self,
+        _ctx: &mut ValidationContext<'_>,
+    ) -> Result<ValidationResult, ReadlineError> {
+        Ok(ValidationResult::Valid(None))
+    }
+}
+
+impl Highlighter for CommandCompleter {
+    fn highlight<'l>(&self, line: &'l str, _pos: usize) -> Cow<'l, str> {
+        Cow::Borrowed(line)
+    }
+
+    fn highlight_char(&self, _line: &str, _pos: usize, _cmd_kind: CmdKind) -> bool {
+        false
+    }
+}
+
+impl Hinter for CommandCompleter {
+    type Hint = String;
+
+    fn hint(&self, _line: &str, _pos: usize, _ctx: &Context<'_>) -> Option<String> {
+        None
+    }
+}
+
+impl Helper for CommandCompleter {}
+
+#[derive(Parser)]
+#[command(name = "Vanadium", about = "Run a V-App on Vanadium")]
+struct Args {
+    /// Path to the ELF file of the V-App (if not the default one)
+    app: Option<String>,
+
+    /// Use the HID interface for a real device, instead of Speculos
+    #[arg(long, group = "interface")]
+    hid: bool,
+
+    /// Use the native interface
+    #[arg(long, group = "interface")]
+    native: bool,
+}
+
+// a bit of a hack: we convert the prompt in a format that clap can parse
+// (adding a dummy command, and replacing each 'argument' with '--argument')
+fn prepare_prompt_for_clap(line: &str) -> Result<Vec<String>, String> {
+    let args = shellwords::split(line).map_err(|e| format!("Failed to parse input: {}", e))?;
+    if args.is_empty() {
+        return Err("Empty input".to_string());
+    }
+
+    // dummy command, and first command unchanged
+    let mut clap_args = vec!["dummy".to_string(), args[0].clone()];
+
+    // prepend `--` to each subsequent argument
+    for arg in &args[1..] {
+        clap_args.push(format!("--{}", arg));
+    }
+    Ok(clap_args)
+}
+
+async fn handle_cli_command(
+    app_client: &mut AtprotoAppClient,
+    cli: &Cli,
+) -> Result<(), Box<dyn std::error::Error>> {
+    match &cli.command {
+        CliCommand::GetDidKey { key_index, display } => {
+            let key = app_client
+                .get_did_key(key_index.unwrap_or(0), *display)
+                .await?;
+            println!("did:key:z{}", key.to_base58());
+        }
+        CliCommand::Exit => {
+            return Err("Exiting".into());
+        }
+    }
+    Ok(())
+}
+
+#[tokio::main(flavor = "multi_thread")]
+async fn main() -> Result<(), Box<dyn std::error::Error>> {
+    let args = Args::parse();
+
+    let default_app_path = if args.native {
+        "../target/x86_64-unknown-linux-gnu/release/vnd-atproto-app"
+    } else {
+        "../target/riscv32imc-unknown-none-elf/release/vnd-atproto-app"
+    };
+
+    let app_path_str = args.app.unwrap_or(default_app_path.to_string());
+
+    let mut app_client = if args.native {
+        AtprotoAppClient::new(Box::new(
+            NativeAppClient::new(&app_path_str)
+                .await
+                .map_err(|_| "Failed to create client")?,
+        ))
+    } else {
+        let transport_raw: Arc<
+            dyn Transport<Error = Box<dyn std::error::Error + Send + Sync>> + Send + Sync,
+        > = if args.hid {
+            Arc::new(TransportHID::new(
+                TransportNativeHID::new(
+                    &HidApi::new().expect("Unable to get connect to the device"),
+                )
+                .unwrap(),
+            ))
+        } else {
+            Arc::new(
+                TransportTcp::new()
+                    .await
+                    .expect("Unable to get TCP transport. Is speculos running?"),
+            )
+        };
+        let transport = TransportWrapper::new(transport_raw.clone());
+
+        let (client, _) = VanadiumAppClient::new(&app_path_str, Arc::new(transport), None)
+            .await
+            .map_err(|e| format!("Failed to create client: {}", e))?;
+
+        AtprotoAppClient::new(Box::new(client))
+    };
+
+    let mut rl = Editor::<CommandCompleter, rustyline::history::DefaultHistory>::new()?;
+    rl.set_helper(Some(CommandCompleter));
+
+    let _ = rl.load_history("history.txt");
+
+    loop {
+        match rl.readline("> ") {
+            Ok(line) => {
+                if line.trim().is_empty() {
+                    continue;
+                }
+                rl.add_history_entry(line.as_str())?;
+
+                let clap_args = match prepare_prompt_for_clap(&line) {
+                    Ok(args) => args,
+                    Err(e) => {
+                        println!("Error: {}", e);
+                        continue;
+                    }
+                };
+
+                match Cli::try_parse_from(clap_args) {
+                    Ok(cli) => {
+                        if let Err(e) = handle_cli_command(&mut app_client, &cli).await {
+                            println!("Error: {}", e);
+                        }
+                    }
+                    Err(e) => println!("Invalid command: {}", e),
+                }
+            }
+            Err(ReadlineError::Interrupted) => println!("Interrupted"),
+            Err(ReadlineError::Eof) => {
+                println!("Exiting");
+                break;
+            }
+            Err(err) => {
+                println!("Error: {:?}", err);
+                break;
+            }
+        }
+    }
+
+    rl.save_history("history.txt")?;
+
+    app_client.exit().await?;
+
+    Ok(())
+}

client/Cargo.toml

···
+[package]
+name = "vnd-atproto-client"
+version = "0.0.1"
+edition = "2021"
+
+[dependencies]
+common = { package = "vnd-atproto-common", path = "../common"}
+sdk = { package = "vanadium-client-sdk", git = "https://github.com/LedgerHQ/vanadium"}
+serde_ipld_dagcbor = { git = "http://github.com/edouardparis/serde_ipld_dagcbor", branch = "scopeguard-no-default-features", default-features = false }

client/src/lib.rs

···
+use common::message::{Request, Response};
+use sdk::vanadium_client::{VAppClient, VAppExecutionError};
+
+use sdk::comm::SendMessageError;
+
+pub use sdk::{transport, vanadium_client};
+
+#[derive(Debug)]
+pub enum AtprotoAppClientError {
+    VAppExecutionError(VAppExecutionError),
+    SendMessageError(SendMessageError),
+    InvalidResponse(&'static str),
+    GenericError(&'static str),
+}
+
+impl From<VAppExecutionError> for AtprotoAppClientError {
+    fn from(e: VAppExecutionError) -> Self {
+        Self::VAppExecutionError(e)
+    }
+}
+
+impl From<SendMessageError> for AtprotoAppClientError {
+    fn from(e: SendMessageError) -> Self {
+        Self::SendMessageError(e)
+    }
+}
+
+impl From<&'static str> for AtprotoAppClientError {
+    fn from(e: &'static str) -> Self {
+        Self::GenericError(e)
+    }
+}
+
+impl std::fmt::Display for AtprotoAppClientError {
+    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+        match self {
+            AtprotoAppClientError::VAppExecutionError(e) => write!(f, "VAppExecutionError: {}", e),
+            AtprotoAppClientError::SendMessageError(e) => write!(f, "SendMessageError: {}", e),
+            AtprotoAppClientError::InvalidResponse(e) => write!(f, "InvalidResponse: {}", e),
+            AtprotoAppClientError::GenericError(e) => write!(f, "GenericError: {}", e),
+        }
+    }
+}
+
+impl std::error::Error for AtprotoAppClientError {
+    fn source(&self) -> Option<&(dyn std::error::Error + 'static)> {
+        match self {
+            AtprotoAppClientError::VAppExecutionError(e) => Some(e),
+            AtprotoAppClientError::SendMessageError(e) => Some(e),
+            AtprotoAppClientError::InvalidResponse(_) => None,
+            AtprotoAppClientError::GenericError(_) => None,
+        }
+    }
+}
+
+pub struct AtprotoAppClient {
+    app_client: Box<dyn VAppClient + Send + Sync>,
+}
+
+impl<'a> AtprotoAppClient {
+    pub fn new(app_client: Box<dyn VAppClient + Send + Sync>) -> Self {
+        Self { app_client }
+    }
+
+    async fn send_message(&mut self, out: &[u8]) -> Result<Vec<u8>, AtprotoAppClientError> {
+        sdk::comm::send_message(&mut self.app_client, out)
+            .await
+            .map_err(AtprotoAppClientError::from)
+    }
+
+    async fn parse_response(response_raw: &'a [u8]) -> Result<Response, AtprotoAppClientError> {
+        let resp: Response = serde_ipld_dagcbor::from_slice(response_raw)
+            .map_err(|_| AtprotoAppClientError::GenericError("Failed to parse response"))?;
+        Ok(resp)
+    }
+
+    pub async fn get_did_key(
+        &mut self,
+        index: u32,
+        display: bool,
+    ) -> Result<Vec<u8>, AtprotoAppClientError> {
+        let msg = serde_ipld_dagcbor::to_vec(&Request::GetDidKey { index, display })
+            .map_err(|_| AtprotoAppClientError::GenericError("Failed to serialize Exit request"))?;
+
+        let response_raw = self.send_message(&msg).await?;
+        match Self::parse_response(&response_raw).await? {
+            Response::DidKey(key) => Ok(key),
+            _ => Err(AtprotoAppClientError::InvalidResponse("Invalid response")),
+        }
+    }
+
+    pub async fn exit(&mut self) -> Result<i32, AtprotoAppClientError> {
+        let msg = serde_ipld_dagcbor::to_vec(&Request::Exit)
+            .map_err(|_| AtprotoAppClientError::GenericError("Failed to serialize Exit request"))?;
+        let response_raw = self.send_message(&msg).await?;
+
+        match Self::parse_response(&response_raw).await {
+            Ok(_) => Err(AtprotoAppClientError::InvalidResponse(
+                "Exit message shouldn't return!",
+            )),
+            Err(e) => match e {
+                AtprotoAppClientError::VAppExecutionError(VAppExecutionError::AppExited(
+                    status,
+                )) => Ok(status),
+                e => {
+                    println!("Unexpected error on exit: {:?}", e);
+                    Err(AtprotoAppClientError::InvalidResponse(
+                        "Unexpected error on exit",
+                    ))
+                }
+            },
+        }
+    }
+}

common/Cargo.toml

···
+[package]
+name = "vnd-atproto-common"
+version = "0.0.1"
+authors = ["Edouard Paris <[e-mail]>"]
+edition = "2018"
+description = "Vanadium app for atproto plc"
+
+[dependencies]
+serde = { version = "1.0", default-features = false, features = ["alloc"] }

common/src/lib.rs

···
+#![cfg_attr(not(test), no_std)]
+
+extern crate alloc;
+
+pub mod message {
+    use alloc::{string::String, vec::Vec};
+    use serde::{Deserialize, Serialize};
+
+    #[derive(Serialize, Deserialize, Debug, Clone, PartialEq, Eq)]
+    pub enum Request {
+        Exit,
+        GetDidKey { index: u32, display: bool },
+        // SignPlcOperation {
+        //     key_index: u32,
+        //     previous: Option<PlcOperation>,
+        //     operation: PlcOperation,
+        // },
+    }
+
+    #[derive(Serialize, Deserialize, Debug, Clone, PartialEq, Eq)]
+    pub enum PlcOperation {}
+
+    #[derive(Serialize, Deserialize, Debug, Clone, PartialEq, Eq)]
+    pub enum Response {
+        DidKey(Vec<u8>),
+        // Signature(Vec<u8>),
+        Error(String),
+    }
+}

src/main.rs

···
+#![cfg_attr(target_arch = "riscv32", no_std, no_main)]
+
+extern crate alloc;
+
+use alloc::{string::ToString, vec::Vec};
+use common::message::{Request, Response};
+use sdk::{
+    App,
+    curve::{Curve, EcfpPrivateKey, Secp256k1, ToPublicKey},
+};
+
+sdk::bootstrap!();
+
+#[cfg(not(test))]
+fn display_key(pubkey: &[u8], index: u32) -> bool {
+    use alloc::string::ToString;
+    use base58::ToBase58;
+    use sdk::ux::TagValue;
+
+    let did_key = alloc::format!("did:key:z{}", pubkey.to_base58());
+
+    sdk::ux::review_pairs(
+        "Verify Atproto DID key",
+        "",
+        &[TagValue {
+            tag: "Index".into(),
+            value: index.to_string(),
+        }],
+        &did_key,
+        "Confirm",
+        false,
+    )
+}
+
+#[cfg(test)]
+fn display_key(pubkey: &[u8], index: u32) -> bool {
+    true
+}
+
+pub fn get_did_key(index: u32, display: bool) -> Result<Response, &'static str> {
+    if index > 256 {
+        return Err("Derivation path is too long");
+    }
+
+    let hd_node = sdk::curve::Secp256k1::derive_hd_node(&[index])?;
+    let privkey: EcfpPrivateKey<Secp256k1, 32> = EcfpPrivateKey::new(*hd_node.privkey);
+    let pubkey = privkey.to_public_key();
+    let uncompressed_pubkey = pubkey.as_ref().to_bytes();
+
+    let mut key = Vec::with_capacity(34);
+    key.push(0xE7);
+    key.push(uncompressed_pubkey[64] % 2 + 0x02);
+    key.extend_from_slice(&uncompressed_pubkey[1..33]);
+
+    if display && !display_key(&key, index) {
+        return Err("Rejected by the user");
+    }
+
+    Ok(Response::DidKey(key))
+}
+
+fn process(_app: &mut App, request: &[u8]) -> Vec<u8> {
+    let request: Request = serde_ipld_dagcbor::from_slice(request).unwrap();
+    let response = match request {
+        Request::Exit => sdk::exit(0),
+        Request::GetDidKey { index, display } => get_did_key(index, display)
+            .map_err(|e| Response::Error(e.to_string()))
+            .unwrap(),
+    };
+    serde_ipld_dagcbor::to_vec(&response).unwrap()
+}
+
+pub fn main() {
+    App::new(process).run()
+}