添加新签名器

src/
├── your_service/
│   ├── mod.rs      # Main implementation with SolanaSigner trait
│   └── types.rs    # API request/response types (if needed)

//! YourService API signer integration

use crate::sdk_adapter::{Pubkey, Signature, VersionedTransaction};
use crate::{error::SignerError, traits::SolanaSigner};
use std::str::FromStr;

/// YourService-based signer using YourService's API
#[derive(Clone)]
pub struct YourServiceSigner {
    api_key: String,
    api_secret: String,
    wallet_id: String,
    api_base_url: String,
    client: reqwest::Client,
    public_key: Pubkey,
}

impl std::fmt::Debug for YourServiceSigner {
    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
        f.debug_struct("YourServiceSigner")
            .field("public_key", &self.public_key)
            .finish_non_exhaustive()
    }
}

use crate::http_client_config::HttpClientConfig;

impl YourServiceSigner {
    pub fn new(
        api_key: String,
        api_secret: String,
        wallet_id: String,
        public_key: String,
        http_config: Option<HttpClientConfig>,
    ) -> Result<Self, SignerError> {
        let pubkey = Pubkey::from_str(&public_key)
            .map_err(|e| SignerError::InvalidPublicKey(format!("Invalid public key: {e}")))?;

        let http = http_config.unwrap_or_default();
        let builder = reqwest::Client::builder()
            .timeout(http.resolved_request_timeout())
            .connect_timeout(http.resolved_connect_timeout());

        // Enforce HTTPS in production; wiremock uses HTTP in tests
        #[cfg(not(test))]
        let builder = builder.https_only(true);

        let client = builder.build().map_err(|e| {
            SignerError::ConfigError(format!("Failed to build HTTP client: {e}"))
        })?;

        Ok(Self {
            api_key,
            api_secret,
            wallet_id,
            api_base_url: "https://api.yourservice.com/v1".to_string(),
            client,
            public_key: pubkey,
        })
    }

    /// Sign raw bytes using your service's API
    async fn sign(&self, message: &[u8]) -> Result<Signature, SignerError> {
        let encoded_message = base64::engine::general_purpose::STANDARD.encode(message);

        let url = format!("{}/sign", self.api_base_url);
        let response = self
            .client
            .post(&url)
            .header("Authorization", format!("Bearer {}", self.api_key))
            .json(&serde_json::json!({
                "wallet_id": self.wallet_id,
                "message": encoded_message,
            }))
            .send()
            .await?;

        // Use generic error messages: never expose raw API response text
        if !response.status().is_success() {
            let status = response.status().as_u16();
            return Err(SignerError::remote_api(format!(
                "YourService API returned status {status}"
            )));
        }

        // Parse response: always use map_err, never .expect() or .unwrap()
        let response_data: SignResponse = response
            .json()
            .await
            .map_err(|e| SignerError::SerializationError(format!("Failed to parse response: {e}")))?;
        let sig_bytes = base64::engine::general_purpose::STANDARD
            .decode(&response_data.signature)
            .map_err(|e| SignerError::SerializationError(format!("Failed to decode signature: {e}")))?;

        let sig_array: [u8; 64] = sig_bytes
            .try_into()
            .map_err(|_| SignerError::SigningFailed("Invalid signature length".to_string()))?;

        Ok(Signature::from(sig_array))
    }
}

use crate::signature_util::verify_or_reject;
use crate::traits::{SignTransactionResult, TransactionSigner};
use crate::transaction_util::TransactionUtil;

#[async_trait::async_trait]
impl SolanaSigner for YourServiceSigner {
    fn pubkey(&self) -> Pubkey {
        self.public_key
    }

    async fn sign_message(&self, message: &[u8]) -> Result<Signature, SignerError> {
        let signature = self.sign(message).await?;
        verify_or_reject(&signature, &self.public_key, message)?;
        Ok(signature)
    }

    async fn is_available(&self) -> bool {
        let url = format!("{}/health", self.api_base_url);
        self.client
            .get(&url)
            .send()
            .await
            .map(|r| r.status().is_success())
            .unwrap_or(false)
    }
}

#[async_trait::async_trait]
impl TransactionSigner for YourServiceSigner {
    async fn sign_transaction(
        &self,
        tx: &mut VersionedTransaction,
    ) -> Result<SignTransactionResult, SignerError> {
        let message = tx.message.serialize();
        let signature = self.sign(&message).await?;
        verify_or_reject(&signature, &self.public_key, &message)?;

        TransactionUtil::add_signature_to_transaction(tx, &self.public_key, signature)?;
        let serialized = TransactionUtil::serialize_transaction(tx)?;
        Ok(TransactionUtil::classify_signed_transaction(
            tx,
            (serialized, signature),
        ))
    }
}

use serde::{Deserialize, Serialize};

#[derive(Serialize)]
pub struct SignRequest {
    pub wallet_id: String,
    pub message: String,
}

#[derive(Deserialize)]
pub struct SignResponse {
    pub signature: String,
}

[features]
default = ["memory", "sdk-v2"]
memory = []
vault = ["dep:reqwest", "_remote"]
privy = ["dep:reqwest", "dep:p256", "_remote"]
your_service = ["dep:reqwest", "_remote"]  # Add your feature
all = ["memory", "vault", "privy", "...", "your_service"]  # Update all

// Add feature-gated module
#[cfg(feature = "your_service")]
pub mod your_service;

// Re-export your signer type
#[cfg(feature = "your_service")]
pub use your_service::YourServiceSigner;

// Add to Signer enum
#[derive(Debug)]
pub enum Signer {
    #[cfg(feature = "memory")]
    Memory(MemorySigner),

    // ... existing variants

    #[cfg(feature = "your_service")]
    YourService(YourServiceSigner),  // Add your variant
}

// Add constructor method
impl Signer {
    #[cfg(feature = "your_service")]
    pub fn from_your_service(
        api_key: String,
        api_secret: String,
        wallet_id: String,
        public_key: String,
    ) -> Result<Self, SignerError> {
        Ok(Self::YourService(YourServiceSigner::new(
            api_key,
            api_secret,
            wallet_id,
            public_key,
            None, // uses default HttpClientConfig
        )?))
    }
}

// Update the dispatch macro: the base SolanaSigner impl uses it for
// pubkey, sign_message and is_available
macro_rules! dispatch_signer {
    ($self:ident, $signer:pat => $body:expr) => {
        match $self {
            // ... existing variants
            #[cfg(feature = "your_service")]
            Signer::YourService($signer) => $body,
        }
    };
}

// Add your arm to the capability accessor matching your shape
impl Signer {
    pub fn as_transaction_signer(&self) -> Option<&dyn TransactionSigner> {
        match self {
            // ... existing variants
            #[cfg(feature = "your_service")]
            Signer::YourService(s) => Some(s),
        }
    }
}

#[cfg(test)]
mod tests {
    use super::*;
    use solana_sdk::{signature::Keypair, signer::Signer};
    use wiremock::{
        matchers::{header, method, path},
        Mock, MockServer, ResponseTemplate,
    };

    #[tokio::test]
    async fn test_new() {
        let keypair = Keypair::new();
        let signer = YourServiceSigner::new(
            "test-key".to_string(),
            "test-secret".to_string(),
            "test-wallet".to_string(),
            keypair.pubkey().to_string(),
            None,
        );
        assert!(signer.is_ok());
    }

    #[tokio::test]
    async fn test_sign_message() {
        let mock_server = MockServer::start().await;
        let keypair = Keypair::new();
        let message = b"test message";
        let signature = keypair.sign_message(message);

        Mock::given(method("POST"))
            .and(path("/sign"))
            .respond_with(ResponseTemplate::new(200).set_body_json(serde_json::json!({
                "signature": base64::engine::general_purpose::STANDARD.encode(signature.as_ref())
            })))
            .expect(1)
            .mount(&mock_server)
            .await;

        let mut signer = YourServiceSigner::new(
            "test-key".to_string(),
            "test-secret".to_string(),
            "test-wallet".to_string(),
            keypair.pubkey().to_string(),
            None,
        ).unwrap();
        signer.api_base_url = mock_server.uri();

        let result = signer.sign_message(message).await;
        assert!(result.is_ok());
    }

    #[tokio::test]
    async fn test_sign_unauthorized() {
        let mock_server = MockServer::start().await;
        let keypair = Keypair::new();

        Mock::given(method("POST"))
            .and(path("/sign"))
            .respond_with(ResponseTemplate::new(401))
            .expect(1)
            .mount(&mock_server)
            .await;

        let mut signer = YourServiceSigner::new(
            "bad-key".to_string(),
            "bad-secret".to_string(),
            "test-wallet".to_string(),
            keypair.pubkey().to_string(),
            None,
        ).unwrap();
        signer.api_base_url = mock_server.uri();

        let result = signer.sign_message(b"test").await;
        assert!(result.is_err());
    }
}

pub mod test_your_service_integration;

# YourService Configuration (for SIGNER_TYPE=your_service)
YOUR_SERVICE_API_KEY=your-api-key
YOUR_SERVICE_WALLET_ID=your-wallet-id
# YOUR_SERVICE_API_BASE_URL=https://api.yourservice.com/v1  # Optional, defaults to this

use solana_keychain::{Signer, SolanaSigner};

#[tokio::main]
async fn main() -> Result<(), Box<dyn std::error::Error>> {
    let signer = Signer::from_your_service(
        "your-api-key".to_string(),
        "your-api-secret".to_string(),
        "your-wallet-id".to_string(),
        "your-public-key".to_string(),
    )?;

    let pubkey = signer.pubkey();
    println!("Public key: {}", pubkey);

    Ok(())
}

# Unit tests across the sdk-v2, sdk-v3 and sdk-v4 matrices
just rust-test

# Live integration tests (require credentials in .env)
just rust-test-integration

// Good: uses the constructor with a generic message
return Err(SignerError::remote_api(format!(
    "YourService API returned status {status}"
)));

// Good: converts from standard errors
let bytes = base64::decode(data)
    .map_err(|e| SignerError::SerializationError(format!("Failed to decode: {e}")))?;

#[cfg(test)]
mod tests {
    use wiremock::{MockServer, Mock, ResponseTemplate};

    #[tokio::test]
    async fn test_api_call() {
        let mock_server = MockServer::start().await;

        Mock::given(method("POST"))
            .respond_with(ResponseTemplate::new(200))
            .mount(&mock_server)
            .await;

        // Use mock_server.uri() as your api_base_url
    }
}

feat(signer): add YourService signer integration

Adds support for YourService as a signing backend.

- [X] Code compiles without warnings (`just build`)
- [X] Code is formatted/linting passes (`just fmt`)
- [X] Add comprehensive tests with wiremock - All tests pass (`just test`)
- [X] Implemented SolanaSigner and TransactionSigner for YourServiceSigner
- [X] Added feature flag 'your_service'
- [X] HTTPS enforced, HTTP timeouts configured
- [X] Returned signatures verified before attaching
- [X] Added integration tests and updated .env.example
- [X] TypeScript, Python and Go implementations included
- [X] CI Phase 2 changes included
- [X] Added to README.md supported backends table

Closes #1337