1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
#[doc(hidden)]
macro_rules! client_impl {
() => {
/// Relay a buffer to a peer over the noise protocol channel.
///
/// The peers must have already performed the noise protocol
/// handshake.
async fn relay(
&mut self,
public_key: impl AsRef<[u8]>,
payload: &[u8],
encoding: Encoding,
broadcast: bool,
session_id: Option<SessionId>,
) -> Result<()> {
let mut peers = self.peers.write().await;
if let Some(peer) = peers.get_mut(public_key.as_ref()) {
let request = encrypt_peer_channel(
public_key, peer, payload, encoding, broadcast,
session_id,
)
.await?;
self.outbound_tx
.send(InternalMessage::Request(request))?;
Ok(())
} else {
Err(Error::PeerNotFound(hex::encode(
public_key.as_ref().to_vec(),
)))
}
}
/// Encrypt a request message and send over the encrypted
/// server channel.
async fn request(
&mut self,
message: ServerMessage,
) -> Result<()> {
let envelope = {
let mut server = self.server.write().await;
if let Some(server) = server.as_mut() {
let payload = encode(&message).await?;
let inner = encrypt_server_channel(
server, &payload, false,
)
.await?;
Some(inner)
} else {
None
}
};
if let Some(envelope) = envelope {
let request = RequestMessage::Opaque(
OpaqueMessage::ServerMessage(envelope),
);
self.outbound_tx
.send(InternalMessage::Request(request))?;
Ok(())
} else {
unreachable!()
}
}
/// Send a buffer.
async fn send(&mut self, buffer: Vec<u8>) -> Result<()> {
Ok(self
.outbound_tx
.send(InternalMessage::Buffer(buffer))?)
}
};
}
#[doc(hidden)]
macro_rules! client_transport_impl {
($kind:ty) => {
#[async_trait::async_trait]
impl crate::NetworkTransport for $kind {
/// Public key for this client.
fn public_key(&self) -> &[u8] {
self.options.keypair.as_ref().unwrap().public_key()
}
/// Perform initial handshake with the server.
async fn connect(&mut self) -> Result<()> {
if self.options.is_encrypted() {
let request = {
let mut state = self.server.write().await;
let (len, payload) = match &mut *state {
Some(ProtocolState::Handshake(initiator)) => {
let mut request = vec![0u8; 1024];
let len =
initiator.write_message(&[], &mut request)?;
(len, request)
}
_ => return Err(Error::NotHandshakeState),
};
RequestMessage::Transparent(
TransparentMessage::ServerHandshake(
HandshakeMessage::Initiator(len, payload),
),
)
};
self.outbound_tx.send(InternalMessage::Request(request))?;
}
Ok(())
}
async fn is_connected(&self) -> bool {
let state = self.server.read().await;
matches!(&*state, Some(ProtocolState::Transport(_)))
}
/// Handshake with a peer.
///
/// Peer already exists error is returned if this
/// client is already connecting to the peer.
async fn connect_peer(
&mut self,
public_key: &[u8],
) -> Result<()> {
let mut peers = self.peers.write().await;
if peers.get(public_key.as_ref()).is_some() {
return Err(Error::PeerAlreadyExists);
//return Ok(())
}
tracing::debug!(
to = ?hex::encode(public_key.as_ref()),
"peer handshake initiator"
);
let builder = Builder::new(self.options.params()?);
let handshake = builder
.local_private_key(self.options.keypair.as_ref().unwrap().private_key())
.remote_public_key(public_key.as_ref())
.build_initiator()?;
let peer_state =
ProtocolState::Handshake(Box::new(handshake));
let state = peers
.entry(public_key.as_ref().to_vec())
.or_insert(peer_state);
let (len, payload) = match state {
ProtocolState::Handshake(initiator) => {
let mut request = vec![0u8; 1024];
let len =
initiator.write_message(&[], &mut request)?;
(len, request)
}
_ => return Err(Error::NotHandshakeState),
};
drop(peers);
let request = RequestMessage::Transparent(
TransparentMessage::PeerHandshake {
public_key: public_key.as_ref().to_vec(),
message: HandshakeMessage::Initiator(len, payload),
},
);
self.outbound_tx.send(InternalMessage::Request(request))?;
Ok(())
}
/// Send a JSON message to a peer via the relay service.
async fn send_json<S>(
&mut self,
public_key: &[u8],
payload: &S,
session_id: Option<SessionId>,
) -> Result<()>
where
S: Serialize + Send + Sync,
{
self.relay(
public_key,
&JsonMessage::serialize(payload)?,
Encoding::Json,
false,
session_id,
)
.await
}
/// Send a binary message to a peer via the relay service.
async fn send_blob(
&mut self,
public_key: &[u8],
payload: Vec<u8>,
session_id: Option<SessionId>,
) -> Result<()> {
self.relay(
public_key,
&payload,
Encoding::Blob,
false,
session_id,
)
.await
}
/// Create a new meeting point.
async fn new_meeting(
&mut self,
owner_id: UserId,
slots: HashSet<UserId>,
) -> Result<()> {
let message = MeetingRequest::NewRoom {
owner_id,
slots,
};
let buffer = serde_json::to_vec(&message)?;
self.send(buffer).await
}
/// Join a meeting point.
async fn join_meeting(
&mut self,
meeting_id: MeetingId,
user_id: UserId,
data: PublicKeys,
) -> Result<()> {
let message = MeetingRequest::JoinRoom {
meeting_id,
user_id,
data,
};
let buffer = serde_json::to_vec(&message)?;
self.send(buffer).await
}
/// Create a new session.
async fn new_session(
&mut self,
participant_keys: Vec<Vec<u8>>,
) -> Result<()> {
let session = SessionRequest { participant_keys };
let message = ServerMessage::NewSession(session);
self.request(message).await
}
/// Register a peer connection in a session.
async fn register_connection(
&mut self,
session_id: &SessionId,
peer_key: &[u8],
) -> Result<()> {
let message = ServerMessage::SessionConnection {
session_id: *session_id,
peer_key: peer_key.to_vec(),
};
self.request(message).await
}
/// Close a session.
async fn close_session(
&mut self,
session_id: SessionId,
) -> Result<()> {
let message = ServerMessage::CloseSession(session_id);
self.request(message).await
}
#[cfg(not(target_arch="wasm32"))]
async fn close(&self) -> Result<()> {
self.outbound_tx.send(InternalMessage::Close)?;
Ok(())
}
#[cfg(target_arch="wasm32")]
async fn close(&self) -> Result<()> {
// Remove event listener closures
self.ws.set_onopen(None);
self.ws.set_onmessage(None);
self.ws.set_onerror(None);
// Close the socket connection
self.ws.close()?;
// Must also dispatch the close event for the driver
self.outbound_tx.send(InternalMessage::Close)?;
Ok(())
}
}
}
}
pub(crate) use client_impl;
pub(crate) use client_transport_impl;