nostr-sdk 0.45.0

// Copyright (c) 2022-2023 Yuki Kishimoto
// Copyright (c) 2023-2025 Rust Nostr Developers
// Distributed under the MIT software license

use nostr_sdk::prelude::*;

#[tokio::main]
async fn main() -> Result<(), Box<dyn std::error::Error>> {
    tracing_subscriber::fmt::init();

    let client = Client::default();

    client.add_relay("wss://nostr.oxtr.dev").await?;
    client.add_relay("wss://relay.damus.io").await?;
    client.add_relay("wss://nostr.openchain.fr").await?;

    client.connect().await;

    let keys = Keys::parse("nsec1ufnus6pju578ste3v90xd5m2decpuzpql2295m3sknqcjzyys9ls0qlc85")?;
    let public_key = keys.public_key();

    let subscription = Filter::new()
        .author(public_key)
        .kind(Kind::Metadata)
        .since(Timestamp::now());

    // Subscribe (auto generate subscription ID)
    let output = client.subscribe(subscription).await?;

    // Subscribe with custom ID
    let sub_id_2 = SubscriptionId::new("other-id");
    let filter = Filter::new()
        .author(public_key)
        .kind(Kind::TextNote)
        .since(Timestamp::now());
    client.subscribe(filter).with_id(sub_id_2.clone()).await?;

    // Overwrite previous subscription
    let filter = Filter::new()
        .author(public_key)
        .kind(Kind::EncryptedDirectMessage)
        .since(Timestamp::now());
    client
        .subscribe(filter)
        .with_id(output.id().clone())
        .await?;

    let mut notifications = client.notifications();

    while let Some(notification) = notifications.next().await {
        if let ClientNotification::Event {
            subscription_id,
            event,
            ..
        } = notification
        {
            // Check subscription ID
            if &subscription_id == output.id() {
                // Handle (ex. update specific UI)
            }

            // Check kind
            if event.kind == Kind::EncryptedDirectMessage {
                if let Ok(msg) = nip04::decrypt(keys.secret_key(), &event.pubkey, &event.content) {
                    println!("DM: {msg}");
                } else {
                    tracing::error!("Impossible to decrypt direct message");
                }
            } else if event.kind == Kind::TextNote {
                println!("TextNote: {:?}", event);
            } else {
                println!("{:?}", event);
            }
        }
    }

    Ok(())
}