Rust Nostr Book

// Sender
let alice_keys =
    Keys::parse("5c0c523f52a5b6fad39ed2403092df8cebc36318b39383bca6c00808626fab3a")?;
let alice_client = Client::new(alice_keys);
alice_client.add_relay(url.clone()).await?;
alice_client.connect().await;

// Receiver
let bob_keys = Keys::parse("nsec1j4c6269y9w0q2er2xjw8sv2ehyrtfxq3jwgdlxj6qfn8z4gjsq5qfvfk99")?;
let bob_client = Client::new(bob_keys.clone());
bob_client.add_relay(url.clone()).await?;
bob_client.connect().await;

// Initialize subscription on Bob's side before sending the message
// Limit is set to 0 to get only new events!
// Timestamp::now() CAN'T be used for gift wrap since the timestamps are tweaked!
let message_filter = Filter::new()
    .kind(Kind::GiftWrap)
    .pubkey(bob_keys.public_key())
    .limit(0);
let subscription_id = bob_client.subscribe(vec![message_filter], None).await?;

// Alice sends private message to Bob
alice_client.send_private_msg(bob_keys.public_key(), "Hello Bob!", []).await?;
println!("Sent private message to Bob");

// Bob receives private message
bob_client.handle_notifications(|notification| async {
    if let RelayPoolNotification::Event { event, .. } = notification {
        if event.kind == Kind::GiftWrap {
            let UnwrappedGift { rumor, sender } = bob_client.unwrap_gift_wrap(&event).await?;
            if rumor.kind == Kind::PrivateDirectMessage {
                println!("Bob received private message from {sender}: {}", &rumor.content);
                return Ok(true); // Message received, exit.
            }
        }
    }
    Ok(false)
}).await?;

bob_client.unsubscribe(subscription_id.val).await;

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