anya-core 1.2.0

//! Open-Source Ledger HSM Provider
//!
//! This module provides integration with Ledger hardware wallets for Bitcoin operations.
//! Ledger devices are open hardware platforms that provide secure key storage and
//! operations with a physical security boundary.

// [AIR-3][AIS-3][BPC-3][RES-3] Import necessary dependencies for Ledger HSM provider
// This follows official Bitcoin Improvement Proposals (BIPs) standards for secure HSM implementation
use std::sync::Arc;

// External crates
use async_trait::async_trait;
use bitcoin::Network;

// [AIR-3][AIS-3][BPC-3][RES-3] Import HSM module types following BDF v2.5 standards
use crate::security::hsm::audit::AuditLogger;
use crate::security::hsm::error::HsmError;
use crate::security::hsm::provider;
use crate::security::hsm::provider::HsmProviderStatus;
use crate::security::hsm::provider::{
    HsmProvider, KeyGenParams, KeyInfo, KeyPair, SigningAlgorithm,
};
use std::collections::HashMap;

/// Configuration for Ledger devices
#[derive(Debug, Clone, serde::Serialize, serde::Deserialize)]
pub struct LedgerConfig {
    /// HSM ID
    pub hsm_id: String,
    /// Bitcoin network (mainnet, testnet, etc.)
    pub network: Network,
    /// Use debug mode
    pub debug: bool,
    /// Custom device path (if not using default)
    pub device_path: Option<String>,
}

/// Ledger HSM Provider for hardware wallet integration
#[derive(Debug)]
pub struct LedgerHsmProvider {
    /// Keys (actually BIP32 paths) known to this provider
    keys: tokio::sync::Mutex<HashMap<String, KeyInfo>>,
    /// Audit logger
    audit_logger: Arc<AuditLogger>,
}

impl LedgerHsmProvider {
    /// Create a new Ledger HSM provider
    pub fn new(_config: &LedgerConfig, audit_logger: Arc<AuditLogger>) -> Result<Self, HsmError> {
        Ok(Self {
            keys: tokio::sync::Mutex::new(HashMap::new()),
            audit_logger,
        })
    }
}

#[async_trait]
impl HsmProvider for LedgerHsmProvider {
    async fn initialize(&self) -> Result<(), HsmError> {
        // In a real implementation, this would initialize the connection to the Ledger device
        self.audit_logger
            .log(
                crate::security::hsm::error::AuditEventType::Initialization,
                crate::security::hsm::error::AuditEventResult::Success,
                crate::security::hsm::error::AuditEventSeverity::Info,
                "Ledger provider initialized (stub implementation)",
            )
            .await?;

        Ok(())
    }

    async fn generate_key(&self, _params: KeyGenParams) -> Result<(KeyPair, KeyInfo), HsmError> {
        // Ledger devices don't generate keys on demand - they use BIP32 derivation
        // Instead, we would store the derivation path as the "key ID"
        Err(HsmError::UnsupportedOperation(
            "Ledger devices use BIP32 derivation rather than generating isolated keys".to_string(),
        ))
    }

    async fn sign(
        &self,
        _key_id: &str,
        _algorithm: SigningAlgorithm,
        _data: &[u8],
    ) -> Result<Vec<u8>, HsmError> {
        // Implementation will be added when Ledger libraries are integrated
        Err(HsmError::UnsupportedOperation(
            "Not implemented yet. Will be available in future versions.".to_string(),
        ))
    }

    async fn verify(
        &self,
        _key_id: &str,
        _algorithm: SigningAlgorithm,
        _data: &[u8],
        _signature: &[u8],
    ) -> Result<bool, HsmError> {
        // Implementation will be added when Ledger libraries are integrated
        Err(HsmError::UnsupportedOperation(
            "Not implemented yet. Will be available in future versions.".to_string(),
        ))
    }

    async fn export_public_key(&self, _key_id: &str) -> Result<Vec<u8>, HsmError> {
        // Implementation will be added when Ledger libraries are integrated
        Err(HsmError::UnsupportedOperation(
            "Not implemented yet. Will be available in future versions.".to_string(),
        ))
    }

    async fn list_keys(&self) -> Result<Vec<KeyInfo>, HsmError> {
        // Implementation will be added when Ledger libraries are integrated
        Ok(vec![])
    }

    async fn delete_key(&self, _key_id: &str) -> Result<(), HsmError> {
        // We can't delete keys from a Ledger - just remove our reference to the BIP32 path
        let mut keys = self.keys.lock().await;
        if keys.remove(_key_id).is_none() {
            return Err(HsmError::KeyNotFound(_key_id.to_string()));
        }

        Ok(())
    }

    async fn get_status(&self) -> Result<HsmProviderStatus, HsmError> {
        // Implementation will be added when Ledger libraries are integrated
        Ok(HsmProviderStatus::Unavailable)
    }

    async fn close(&self) -> Result<(), HsmError> {
        // Implementation will be added when Ledger libraries are integrated
        Ok(())
    }

    async fn execute_operation(
        &self,
        request: provider::HsmRequest,
    ) -> Result<provider::HsmResponse, HsmError> {
        // Just return an unsupported operation error for now
        let _request_id = request.id.clone();
        Err(HsmError::UnsupportedOperation(format!(
            "Operation {:?} not supported in the Ledger provider stub implementation",
            request.operation
        )))
    }
}