nostr: add neg_open method

Author: yukibtc

Cargo.lock

@@ -25,6 +25,7 @@ std = [
     "bitcoin/rand-std", 
     "bip39?/std", 
     "chacha20?/std", 
+    "negentropy/std",
     "serde/std", 
     "serde_json/std", 
     "tracing/std", 
@@ -55,6 +56,7 @@ bip39 = { version = "2.0", default-features = false, optional = true }
 bitcoin = { version = "0.30", default-features = false, features = ["rand", "serde"] }
 cbc = { version = "0.1", optional = true }
 chacha20 = { version = "0.9", optional = true }
+negentropy = { git = "https://github.com/yukibtc/rust-negentropy", rev = "62a65db938c7088d521980d3fc1e1593713a899d", default-features = false }
 nostr-ots = { version = "0.2", optional = true }
 once_cell = { workspace = true, optional = true }
 reqwest = { version = "0.11", default-features = false, features = ["json", "rustls-tls-webpki-roots", "socks"], optional = true }

crates/nostr/Cargo.toml

@@ -31,6 +31,7 @@ pub use bitcoin;
 pub use bitcoin::bech32;
 pub use bitcoin::hashes;
 pub use bitcoin::secp256k1;
+pub use negentropy;
 pub use serde_json;
 pub use url_fork::{self as url, Url};
 

crates/nostr/src/lib.rs

@@ -9,6 +9,7 @@ use alloc::string::{String, ToString};
 use alloc::vec::Vec;
 
 use bitcoin::secp256k1::{Secp256k1, Verification};
+use negentropy::{Bytes, Negentropy};
 #[cfg(feature = "std")]
 use serde::{Deserialize, Deserializer};
 use serde::{Serialize, Serializer};
@@ -122,6 +123,21 @@ impl ClientMessage {
         Self::Auth(Box::new(event))
     }
 
+    /// Create new `NEG-OPEN` message
+    pub fn neg_open(
+        negentropy: &mut Negentropy,
+        subscription_id: &SubscriptionId,
+        filter: Filter,
+    ) -> Result<Self, negentropy::Error> {
+        let initial_message: Bytes = negentropy.initiate()?;
+        Ok(Self::NegOpen {
+            subscription_id: subscription_id.clone(),
+            filter: Box::new(filter),
+            id_size: negentropy.id_size() as u8,
+            initial_message: initial_message.to_hex(),
+        })
+    }
+
     /// Check if is an `EVENT` message
     pub fn is_event(&self) -> bool {
         matches!(self, ClientMessage::Event(_))

crates/nostr/src/message/client.rs

@@ -13,6 +13,7 @@ pub use bitcoin::bech32::*;
 pub use bitcoin::hashes::*;
 pub use bitcoin::secp256k1::*;
 pub use bitcoin::*;
+pub use negentropy::*;
 pub use serde_json::*;
 pub use url_fork::*;