feat(core): implement RawFramingInterface accept/recv/send with first-frame auth

Implement RawFramingSession with tokio::io::split for read/write halves,
BufReader/BufWriter for buffered I/O, and decode_with_remainder for
partial frame reassembly. Add first-frame authentication via
IdentityProvider::resolve_from_token(). Add RawFramingConfig.auth
field for IdentityProvider reference. Update SshInterface test for
new RawFramingConfig shape.

crates/alknet-core/src/interface/config.rs

@@ -111,7 +111,9 @@ pub struct SshInterfaceConfig {
     pub host_key: Arc<PrivateKey>,
 }
 
-pub struct RawFramingConfig {}
+pub struct RawFramingConfig {
+    pub auth: Arc<dyn IdentityProvider>,
+}
 
 #[derive(Debug, Clone, PartialEq, Eq, Serialize, Deserialize)]
 pub struct HttpInterfaceConfig {
@@ -141,6 +143,7 @@ impl std::fmt::Display for DnsInterfaceConfig {
 #[cfg(test)]
 mod tests {
     use super::*;
+    use crate::auth::ConfigIdentityProvider;
 
     #[test]
     fn stream_interface_kind_display() {
@@ -172,7 +175,11 @@ mod tests {
         });
         assert_eq!(ssh_config.kind(), StreamInterfaceKind::Ssh);
 
-        let raw_config = StreamInterfaceConfig::RawFraming(RawFramingConfig {});
+        let raw_config = StreamInterfaceConfig::RawFraming(RawFramingConfig {
+            auth: Arc::new(ConfigIdentityProvider::new(Arc::new(ArcSwap::new(
+                Arc::new(DynamicConfig::default()),
+            )))),
+        });
         assert_eq!(raw_config.kind(), StreamInterfaceKind::RawFraming);
     }
 
@@ -211,7 +218,10 @@ mod tests {
 
     #[test]
     fn raw_framing_config_minimal() {
-        let _config = RawFramingConfig {};
+        let auth: Arc<dyn IdentityProvider> = Arc::new(ConfigIdentityProvider::new(Arc::new(
+            ArcSwap::new(Arc::new(DynamicConfig::default())),
+        )));
+        let _config = RawFramingConfig { auth };
     }
 
     #[test]

crates/alknet-core/src/interface/raw_framing.rs

@@ -1,12 +1,18 @@
+use std::sync::Arc;
+
 use anyhow::Result;
 use async_trait::async_trait;
+use tokio::io::{AsyncReadExt, AsyncWriteExt, BufReader, BufWriter};
 
+use crate::auth::{AuthToken, Identity, IdentityProvider};
+use crate::call::frame::{decode_with_remainder, encode};
+use crate::call::EventEnvelope;
 use crate::interface::session::{InterfaceEvent, InterfaceSession};
 use crate::interface::{StreamInterface, StreamInterfaceConfig, TransportStream};
 
-pub struct RawFramingInterface;
+const READ_BUF_SIZE: usize = 8192;
 
-pub struct RawFramingSession;
+pub struct RawFramingInterface;
 
 #[async_trait]
 impl StreamInterface for RawFramingInterface {
@@ -14,49 +20,380 @@ impl StreamInterface for RawFramingInterface {
 
     async fn accept(
         &self,
-        _stream: Box<dyn TransportStream>,
-        _config: &StreamInterfaceConfig,
+        stream: Box<dyn TransportStream>,
+        config: &StreamInterfaceConfig,
     ) -> Result<Self::Session> {
-        Err(anyhow::anyhow!(
-            "RawFramingInterface is not yet implemented (Phase 4+)"
-        ))
+        let raw_config = match config {
+            StreamInterfaceConfig::RawFraming(c) => c,
+            StreamInterfaceConfig::Ssh(_) => {
+                return Err(anyhow::anyhow!(
+                    "RawFramingInterface received SshInterfaceConfig"
+                ));
+            }
+        };
+
+        Ok(RawFramingSession::new(stream, Arc::clone(&raw_config.auth)))
+    }
+}
+
+enum AuthState {
+    Pending,
+    Authenticated(Identity),
+    Failed,
+}
+
+pub struct RawFramingSession {
+    reader: BufReader<tokio::io::ReadHalf<Box<dyn TransportStream>>>,
+    writer: BufWriter<tokio::io::WriteHalf<Box<dyn TransportStream>>>,
+    auth_state: AuthState,
+    identity_provider: Arc<dyn IdentityProvider>,
+    read_buf: Vec<u8>,
+}
+
+impl RawFramingSession {
+    pub fn new(
+        stream: Box<dyn TransportStream>,
+        identity_provider: Arc<dyn IdentityProvider>,
+    ) -> Self {
+        let (read_half, write_half) = tokio::io::split(stream);
+        Self {
+            reader: BufReader::new(read_half),
+            writer: BufWriter::new(write_half),
+            auth_state: AuthState::Pending,
+            identity_provider,
+            read_buf: Vec::new(),
+        }
+    }
+
+    async fn read_frame(&mut self) -> Result<EventEnvelope> {
+        loop {
+            match decode_with_remainder(&self.read_buf) {
+                Ok((envelope, consumed)) => {
+                    self.read_buf.drain(..consumed);
+                    return Ok(envelope);
+                }
+                Err(crate::call::frame::FrameDecodeError::TooShort { .. })
+                | Err(crate::call::frame::FrameDecodeError::Incomplete { .. }) => {
+                    let mut tmp = [0u8; READ_BUF_SIZE];
+                    let n = self.reader.read(&mut tmp).await?;
+                    if n == 0 {
+                        return Err(anyhow::anyhow!("stream closed while reading frame"));
+                    }
+                    self.read_buf.extend_from_slice(&tmp[..n]);
+                }
+                Err(crate::call::frame::FrameDecodeError::Json(e)) => {
+                    return Err(anyhow::anyhow!("frame JSON decode error: {e}"));
+                }
+            }
+        }
+    }
+
+    async fn write_frame(&mut self, envelope: &EventEnvelope) -> Result<()> {
+        let frame = encode(envelope);
+        self.writer.write_all(&frame).await?;
+        self.writer.flush().await?;
+        Ok(())
     }
 }
 
 #[async_trait]
 impl InterfaceSession for RawFramingSession {
     async fn recv(&mut self) -> Option<InterfaceEvent> {
-        None
+        match &self.auth_state {
+            AuthState::Failed => return None,
+            AuthState::Authenticated(_) => {
+                let identity = match &self.auth_state {
+                    AuthState::Authenticated(id) => id.clone(),
+                    _ => unreachable!(),
+                };
+                let envelope = match self.read_frame().await {
+                    Ok(e) => e,
+                    Err(_) => return None,
+                };
+                return Some(InterfaceEvent::with_identity(envelope, identity));
+            }
+            AuthState::Pending => {}
+        }
+
+        let envelope = match self.read_frame().await {
+            Ok(e) => e,
+            Err(_) => {
+                self.auth_state = AuthState::Failed;
+                return None;
+            }
+        };
+
+        let token_raw = envelope.payload.as_str().unwrap_or("").as_bytes().to_vec();
+        let token = AuthToken { raw: token_raw };
+
+        match self.identity_provider.resolve_from_token(&token) {
+            Some(identity) => {
+                self.auth_state = AuthState::Authenticated(identity.clone());
+                Some(InterfaceEvent::with_identity(envelope, identity))
+            }
+            None => {
+                self.auth_state = AuthState::Failed;
+                None
+            }
+        }
     }
 
-    async fn send(&mut self, _envelope: crate::call::EventEnvelope) -> Result<()> {
-        Err(anyhow::anyhow!(
-            "RawFramingSession is not yet implemented (Phase 4+)"
-        ))
+    async fn send(&mut self, envelope: EventEnvelope) -> Result<()> {
+        match self.auth_state {
+            AuthState::Failed => Err(anyhow::anyhow!("session authentication failed")),
+            _ => self.write_frame(&envelope).await,
+        }
     }
 }
 
 #[cfg(test)]
 mod tests {
     use super::*;
+    use crate::auth::ConfigIdentityProvider;
+    use crate::config::DynamicConfig;
+    use crate::interface::RawFramingConfig;
+    use arc_swap::ArcSwap;
+    use std::collections::HashMap;
+
+    fn make_provider() -> Arc<dyn IdentityProvider> {
+        Arc::new(ConfigIdentityProvider::new(Arc::new(ArcSwap::new(
+            Arc::new(DynamicConfig::default()),
+        ))))
+    }
+
+    fn make_provider_with_identity(
+        identity: Identity,
+        valid_token: &str,
+    ) -> (Arc<dyn IdentityProvider>, String) {
+        struct MockProvider {
+            identity: Identity,
+            valid_token: String,
+        }
+        impl IdentityProvider for MockProvider {
+            fn resolve_from_fingerprint(&self, _fp: &str) -> Option<Identity> {
+                None
+            }
+            fn resolve_from_token(&self, token: &AuthToken) -> Option<Identity> {
+                if token.raw == self.valid_token.as_bytes() {
+                    Some(self.identity.clone())
+                } else {
+                    None
+                }
+            }
+        }
+        let provider = Arc::new(MockProvider {
+            identity,
+            valid_token: valid_token.to_string(),
+        });
+        (provider, valid_token.to_string())
+    }
+
+    #[tokio::test]
+    async fn raw_framing_interface_accept_succeeds() {
+        let iface = RawFramingInterface;
+        let (_client, server) = tokio::io::duplex(1024);
+        let stream: Box<dyn TransportStream> = Box::new(server);
+        let config = StreamInterfaceConfig::RawFraming(RawFramingConfig {
+            auth: make_provider(),
+        });
+        let result = iface.accept(stream, &config).await;
+        assert!(result.is_ok());
+    }
+
+    #[tokio::test]
+    async fn raw_framing_interface_rejects_ssh_config() {
+        let iface = RawFramingInterface;
+        let (_client, server) = tokio::io::duplex(1024);
+        let stream: Box<dyn TransportStream> = Box::new(server);
+        let config = StreamInterfaceConfig::Ssh(crate::interface::SshInterfaceConfig {
+            auth: make_provider(),
+            forwarding: Arc::new(ArcSwap::new(Arc::new(DynamicConfig::default()))),
+            host_key: Arc::new(
+                russh::keys::PrivateKey::random(
+                    &mut rand_core::OsRng,
+                    russh::keys::Algorithm::Ed25519,
+                )
+                .unwrap(),
+            ),
+        });
+        let result = iface.accept(stream, &config).await;
+        assert!(result.is_err());
+    }
+
+    #[tokio::test]
+    async fn raw_framing_session_round_trip() {
+        let identity = Identity {
+            id: "test-id".to_string(),
+            scopes: vec!["relay:connect".to_string()],
+            resources: HashMap::new(),
+        };
+        let (provider, token_str) =
+            make_provider_with_identity(identity.clone(), "valid-test-token");
+
+        let (client, server) = tokio::io::duplex(4096);
+        let server_stream: Box<dyn TransportStream> = Box::new(server);
+        let client_stream: Box<dyn TransportStream> = Box::new(client);
+
+        let mut server_session = RawFramingSession::new(server_stream, provider);
+
+        let auth_envelope = EventEnvelope::new("auth", "auth-1", serde_json::json!(token_str));
+        let auth_frame = encode(&auth_envelope);
+
+        let mut client_writer = tokio::io::BufWriter::new(client_stream);
+        client_writer.write_all(&auth_frame).await.unwrap();
+        client_writer.flush().await.unwrap();
+
+        let event = server_session.recv().await;
+        assert!(event.is_some());
+        let event = event.unwrap();
+        assert!(event.identity.is_some());
+        assert_eq!(event.identity.as_ref().unwrap().id, "test-id");
+
+        let data_envelope =
+            EventEnvelope::call_requested("req-2", serde_json::json!({"op": "test"}));
+        let data_frame = encode(&data_envelope);
+        client_writer.write_all(&data_frame).await.unwrap();
+        client_writer.flush().await.unwrap();
+
+        let event = server_session.recv().await;
+        assert!(event.is_some());
+        let event = event.unwrap();
+        assert_eq!(event.envelope.r#type, "call.requested");
+        assert_eq!(event.envelope.id, "req-2");
+        assert!(event.identity.is_some());
+    }
+
+    #[tokio::test]
+    async fn first_frame_auth_valid_token() {
+        let identity = Identity {
+            id: "auth-user".to_string(),
+            scopes: vec!["admin".to_string()],
+            resources: HashMap::new(),
+        };
+        let (provider, token_str) = make_provider_with_identity(identity, "my-valid-token");
+
+        let (client, server) = tokio::io::duplex(4096);
+        let server_stream: Box<dyn TransportStream> = Box::new(server);
+        let client_stream: Box<dyn TransportStream> = Box::new(client);
+
+        let mut session = RawFramingSession::new(server_stream, provider);
+
+        let auth_envelope = EventEnvelope::new("auth", "auth-1", serde_json::json!(token_str));
+        let frame = encode(&auth_envelope);
+        let mut writer = tokio::io::BufWriter::new(client_stream);
+        writer.write_all(&frame).await.unwrap();
+        writer.flush().await.unwrap();
+
+        let event = session.recv().await;
+        assert!(event.is_some());
+        let event = event.unwrap();
+        assert!(event.identity.is_some());
+        assert_eq!(event.identity.as_ref().unwrap().id, "auth-user");
+        assert_eq!(event.identity.as_ref().unwrap().scopes, vec!["admin"]);
+    }
+
+    #[tokio::test]
+    async fn first_frame_auth_invalid_token() {
+        let identity = Identity {
+            id: "auth-user".to_string(),
+            scopes: vec![],
+            resources: HashMap::new(),
+        };
+        let (provider, _) = make_provider_with_identity(identity, "correct-token");
+
+        let (client, server) = tokio::io::duplex(4096);
+        let server_stream: Box<dyn TransportStream> = Box::new(server);
+        let client_stream: Box<dyn TransportStream> = Box::new(client);
+
+        let mut session = RawFramingSession::new(server_stream, provider);
+
+        let bad_envelope =
+            EventEnvelope::new("auth", "auth-1", serde_json::json!("bad-token-value"));
+        let frame = encode(&bad_envelope);
+        let mut writer = tokio::io::BufWriter::new(client_stream);
+        writer.write_all(&frame).await.unwrap();
+        writer.flush().await.unwrap();
+
+        let event = session.recv().await;
+        assert!(event.is_none());
+
+        let data_envelope = EventEnvelope::call_requested("req-2", serde_json::json!({}));
+        let result = session.send(data_envelope).await;
+        assert!(result.is_err());
+    }
+
+    #[tokio::test]
+    async fn raw_framing_session_send() {
+        let identity = Identity {
+            id: "send-user".to_string(),
+            scopes: vec!["relay:connect".to_string()],
+            resources: HashMap::new(),
+        };
+        let (provider, token_str) = make_provider_with_identity(identity, "send-token");
+
+        let (client, server) = tokio::io::duplex(4096);
+        let server_stream: Box<dyn TransportStream> = Box::new(server);
+        let client_stream: Box<dyn TransportStream> = Box::new(client);
+
+        let mut server_session = RawFramingSession::new(server_stream, provider);
+
+        let auth_envelope = EventEnvelope::new("auth", "auth-1", serde_json::json!(token_str));
+        let auth_frame = encode(&auth_envelope);
+        let mut client_writer = tokio::io::BufWriter::new(client_stream);
+        client_writer.write_all(&auth_frame).await.unwrap();
+        client_writer.flush().await.unwrap();
+
+        let _ = server_session.recv().await;
+
+        let response = EventEnvelope::call_responded("req-1", serde_json::json!({"result": "ok"}));
+        let send_result = server_session.send(response).await;
+        assert!(send_result.is_ok());
+    }
+
+    #[tokio::test]
+    async fn raw_framing_multiple_frames_over_duplex() {
+        let identity = Identity {
+            id: "multi-user".to_string(),
+            scopes: vec!["relay:connect".to_string()],
+            resources: HashMap::new(),
+        };
+        let (provider, token_str) = make_provider_with_identity(identity, "multi-token");
+
+        let (client, server) = tokio::io::duplex(8192);
+        let server_stream: Box<dyn TransportStream> = Box::new(server);
+        let client_stream: Box<dyn TransportStream> = Box::new(client);
+
+        let mut session = RawFramingSession::new(server_stream, provider);
+        let mut client_writer = tokio::io::BufWriter::new(client_stream);
+
+        let auth_envelope = EventEnvelope::new("auth", "auth-0", serde_json::json!(token_str));
+        client_writer
+            .write_all(&encode(&auth_envelope))
+            .await
+            .unwrap();
+
+        for i in 1..=5 {
+            let envelope =
+                EventEnvelope::call_requested(format!("req-{i}"), serde_json::json!({"seq": i}));
+            client_writer.write_all(&encode(&envelope)).await.unwrap();
+        }
+        client_writer.flush().await.unwrap();
+
+        let auth_event = session.recv().await;
+        assert!(auth_event.is_some());
+        assert!(auth_event.unwrap().identity.is_some());
+
+        for i in 1..=5 {
+            let event = session.recv().await;
+            assert!(event.is_some());
+            let event = event.unwrap();
+            assert_eq!(event.envelope.id, format!("req-{i}"));
+            assert!(event.identity.is_some());
+        }
+    }
 
     #[test]
     fn raw_framing_interface_type_exists() {
         let _iface = RawFramingInterface;
     }
-
-    #[test]
-    fn raw_framing_session_type_exists() {
-        let _session = RawFramingSession;
-    }
-
-    #[tokio::test]
-    async fn raw_framing_interface_accept_returns_error() {
-        let iface = RawFramingInterface;
-        let (_client, server) = tokio::io::duplex(1024);
-        let stream: Box<dyn TransportStream> = Box::new(server);
-        let config = StreamInterfaceConfig::RawFraming(crate::interface::RawFramingConfig {});
-        let result = iface.accept(stream, &config).await;
-        assert!(result.is_err());
-    }
 }

crates/alknet-core/src/interface/ssh.rs

@@ -734,7 +734,11 @@ mod tests {
         let (_client, server) = tokio::io::duplex(1024);
         let stream: Box<dyn TransportStream> = Box::new(server);
 
-        let raw_config = StreamInterfaceConfig::RawFraming(crate::interface::RawFramingConfig {});
+        let raw_config = StreamInterfaceConfig::RawFraming(crate::interface::RawFramingConfig {
+            auth: Arc::new(crate::auth::ConfigIdentityProvider::new(Arc::new(
+                ArcSwap::new(Arc::new(DynamicConfig::default())),
+            ))),
+        });
         let result = iface.accept(stream, &raw_config).await;
         assert!(result.is_err());
     }