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
use anyhow::Result;
use nostr_double_ratchet::{
Session, CHAT_MESSAGE_KIND, CHAT_SETTINGS_KIND, REACTION_KIND, RECEIPT_KIND, TYPING_KIND,
};
use crate::output::Output;
use crate::state_sync::{apply_chat_settings, extract_control_stamp_from_value};
use crate::storage::{Storage, StoredGroupMessage, StoredMessage, StoredReaction};
use super::common::{
extract_e_tag, extract_e_tags, extract_expiration_tag_seconds, is_expired,
parse_chat_settings_ttl_seconds,
};
use super::types::{IncomingMessage, IncomingReaction};
/// Receive and decrypt a message from a nostr event
pub async fn receive(event_json: &str, storage: &Storage, output: &Output) -> Result<()> {
// Parse the nostr event
let event: nostr::Event = nostr::JsonUtil::from_json(event_json)
.map_err(|e| anyhow::anyhow!("Invalid event JSON: {}", e))?;
let now_seconds = std::time::SystemTime::now()
.duration_since(std::time::UNIX_EPOCH)?
.as_secs();
// Try to find a matching chat and decrypt
let chats = storage.list_chats()?;
for chat in chats {
let session_state: nostr_double_ratchet::SessionState =
match serde_json::from_str(&chat.session_state) {
Ok(s) => s,
Err(_) => continue,
};
let mut session = Session::new(session_state, chat.id.clone());
// Try to decrypt with this session
match session.receive(&event) {
Ok(Some(decrypted_event_json)) => {
let decrypted_event: serde_json::Value =
serde_json::from_str(&decrypted_event_json)
.map_err(|e| anyhow::anyhow!("Failed to parse decrypted event: {}", e))?;
let content = decrypted_event["content"]
.as_str()
.unwrap_or(&decrypted_event_json)
.to_string();
let rumor_kind = decrypted_event["kind"]
.as_u64()
.unwrap_or(CHAT_MESSAGE_KIND as u64) as u32;
let timestamp = event.created_at.as_u64();
// Prefer the decrypted (inner/rumor) id when available; outer event ids vary per-device.
let msg_id = decrypted_event["id"]
.as_str()
.map(|s| s.to_string())
.unwrap_or_else(|| event.id.to_hex());
let from_pubkey_hex = chat.their_pubkey.clone();
let expires_at = extract_expiration_tag_seconds(&decrypted_event);
// Check for group routing tag
let group_id = decrypted_event["tags"].as_array().and_then(|tags| {
tags.iter().find_map(|t| {
let arr = t.as_array()?;
if arr.first()?.as_str()? == "l" {
arr.get(1)?.as_str().map(String::from)
} else {
None
}
})
});
// Update session state
let mut updated_chat = chat;
updated_chat.session_state = serde_json::to_string(&session.state)?;
// Encrypted 1:1 chat settings (disappearing-message signaling).
if rumor_kind == CHAT_SETTINGS_KIND {
if let Some(ttl) = parse_chat_settings_ttl_seconds(&content) {
if let Some(stamp) = extract_control_stamp_from_value(
&decrypted_event,
Some(&msg_id),
timestamp,
) {
let _ = apply_chat_settings(storage, &mut updated_chat, ttl, &stamp)?;
}
storage.save_chat(&updated_chat)?;
output.success(
"receive",
serde_json::json!({
"chat_id": updated_chat.id,
"from_pubkey": from_pubkey_hex,
"kind": CHAT_SETTINGS_KIND,
"message_ttl_seconds": ttl,
}),
);
return Ok(());
}
}
// Receipt / reaction / typing indicators should not be stored as messages.
if rumor_kind == RECEIPT_KIND {
let message_ids = extract_e_tags(&decrypted_event);
storage.save_chat(&updated_chat)?;
if let Some(gid) = group_id {
output.success(
"receive",
serde_json::json!({
"group_id": gid,
"from_pubkey": from_pubkey_hex,
"kind": RECEIPT_KIND,
"type": content,
"message_ids": message_ids,
"timestamp": timestamp,
}),
);
} else {
output.success(
"receive",
serde_json::json!({
"chat_id": updated_chat.id,
"from_pubkey": from_pubkey_hex,
"kind": RECEIPT_KIND,
"type": content,
"message_ids": message_ids,
"timestamp": timestamp,
}),
);
}
return Ok(());
}
if rumor_kind == REACTION_KIND {
let message_id = extract_e_tag(&decrypted_event);
if let Some(gid) = group_id {
storage.save_chat(&updated_chat)?;
output.success(
"receive",
serde_json::json!({
"group_id": gid,
"sender_pubkey": from_pubkey_hex,
"kind": REACTION_KIND,
"message_id": message_id,
"emoji": content,
"timestamp": timestamp,
}),
);
} else {
let stored = StoredReaction {
id: msg_id.clone(),
chat_id: updated_chat.id.clone(),
message_id: message_id.clone(),
from_pubkey: from_pubkey_hex.clone(),
emoji: content.clone(),
timestamp,
is_outgoing: false,
};
storage.save_reaction(&stored)?;
storage.save_chat(&updated_chat)?;
output.success(
"receive",
IncomingReaction {
chat_id: updated_chat.id,
from_pubkey: from_pubkey_hex,
message_id,
emoji: content,
timestamp,
},
);
}
return Ok(());
}
if rumor_kind == TYPING_KIND {
storage.save_chat(&updated_chat)?;
if let Some(gid) = group_id {
output.success(
"receive",
serde_json::json!({
"group_id": gid,
"sender_pubkey": from_pubkey_hex,
"kind": TYPING_KIND,
"timestamp": timestamp,
}),
);
} else {
output.success(
"receive",
serde_json::json!({
"chat_id": updated_chat.id,
"from_pubkey": from_pubkey_hex,
"kind": TYPING_KIND,
"timestamp": timestamp,
}),
);
}
return Ok(());
}
if let Some(gid) = group_id {
// Group message
if rumor_kind == CHAT_MESSAGE_KIND || rumor_kind == 14 {
if is_expired(expires_at, now_seconds) {
storage.save_chat(&updated_chat)?;
output.success(
"receive",
serde_json::json!({
"group_id": gid,
"message_id": msg_id,
"sender_pubkey": from_pubkey_hex,
"timestamp": timestamp,
"expires_at": expires_at,
"expired": true,
}),
);
return Ok(());
}
let stored = StoredGroupMessage {
id: msg_id.clone(),
group_id: gid.clone(),
sender_pubkey: from_pubkey_hex.clone(),
content: content.clone(),
timestamp,
is_outgoing: false,
expires_at,
};
storage.save_group_message(&stored)?;
}
storage.save_chat(&updated_chat)?;
output.success(
"receive",
serde_json::json!({
"group_id": gid,
"message_id": msg_id,
"sender_pubkey": from_pubkey_hex,
"content": content,
"timestamp": timestamp,
}),
);
} else {
// 1:1 message
if is_expired(expires_at, now_seconds) {
storage.save_chat(&updated_chat)?;
output.success(
"receive",
serde_json::json!({
"chat_id": updated_chat.id,
"message_id": msg_id,
"from_pubkey": from_pubkey_hex,
"timestamp": timestamp,
"expires_at": expires_at,
"expired": true,
}),
);
return Ok(());
}
let stored = StoredMessage {
id: msg_id.clone(),
chat_id: updated_chat.id.clone(),
from_pubkey: from_pubkey_hex.clone(),
content: content.clone(),
timestamp,
is_outgoing: false,
expires_at,
};
storage.save_message(&stored)?;
updated_chat.last_message_at = Some(timestamp);
storage.save_chat(&updated_chat)?;
output.success(
"receive",
IncomingMessage {
chat_id: updated_chat.id,
message_id: msg_id,
from_pubkey: from_pubkey_hex,
content,
timestamp,
},
);
}
return Ok(());
}
Ok(None) => continue,
Err(_) => continue,
}
}
anyhow::bail!("Could not decrypt message - no matching session found");
}