feat(cdk-cli): decode, send, receice payment request

crates/cdk-cli/src/sub_commands/pay_request.rs

@@ -0,0 +1,177 @@
+use std::io::{self, Write};
+
+use anyhow::{anyhow, Result};
+use cdk::{
+    amount::SplitTarget,
+    nuts::{nut18::TransportType, PaymentRequest, PaymentRequestPayload},
+    wallet::{MultiMintWallet, SendKind},
+};
+use clap::Args;
+use nostr_sdk::{nips::nip19::Nip19Profile, Client as NostrClient, EventBuilder, FromBech32, Keys};
+use reqwest::Client;
+
+#[derive(Args)]
+pub struct PayRequestSubCommand {
+    payment_request: PaymentRequest,
+}
+
+pub async fn pay_request(
+    multi_mint_wallet: &MultiMintWallet,
+    sub_command_args: &PayRequestSubCommand,
+) -> Result<()> {
+    let payment_request = &sub_command_args.payment_request;
+
+    let unit = payment_request.unit;
+
+    let amount = match payment_request.amount {
+        Some(amount) => amount,
+        None => {
+            println!("Enter the amount you would like to pay");
+
+            let mut user_input = String::new();
+            let stdin = io::stdin();
+            io::stdout().flush().unwrap();
+            stdin.read_line(&mut user_input)?;
+
+            let amount: u64 = user_input.trim().parse()?;
+
+            amount.into()
+        }
+    };
+
+    let request_mints = &payment_request.mints;
+
+    let wallet_mints = multi_mint_wallet.get_wallets().await;
+
+    // Wallets where unit, balance and mint match request
+    let mut matching_wallets = vec![];
+
+    for wallet in wallet_mints.iter() {
+        let balance = wallet.total_balance().await?;
+
+        if let Some(request_mints) = request_mints {
+            if !request_mints.contains(&wallet.mint_url) {
+                continue;
+            }
+        }
+
+        if let Some(unit) = unit {
+            if wallet.unit != unit {
+                continue;
+            }
+        }
+
+        if balance >= amount {
+            matching_wallets.push(wallet);
+        }
+    }
+
+    let matching_wallet = matching_wallets.first().unwrap();
+
+    // We prefer nostr transport if it is available to hide ip.
+    let transport = payment_request
+        .transports
+        .iter()
+        .find(|t| t._type == TransportType::Nostr)
+        .or_else(|| {
+            payment_request
+                .transports
+                .iter()
+                .find(|t| t._type == TransportType::HttpPost)
+        })
+        .ok_or(anyhow!("No supported transport method found"))?;
+
+    let proofs = matching_wallet
+        .send(
+            amount,
+            None,
+            None,
+            &SplitTarget::default(),
+            &SendKind::default(),
+            true,
+        )
+        .await?
+        .proofs()
+        .get(&matching_wallet.mint_url)
+        .unwrap()
+        .clone();
+
+    let payload = PaymentRequestPayload {
+        id: payment_request.payment_id.clone(),
+        memo: None,
+        mint: matching_wallet.mint_url.clone(),
+        unit: matching_wallet.unit,
+        proofs,
+    };
+
+    match transport._type {
+        TransportType::Nostr => {
+            let keys = Keys::generate();
+            let client = NostrClient::new(keys);
+            let nprofile = Nip19Profile::from_bech32(&transport.target)?;
+
+            println!("{:?}", nprofile.relays);
+
+            let rumor = EventBuilder::new(
+                nostr_sdk::Kind::from_u16(14),
+                serde_json::to_string(&payload)?,
+                [],
+            );
+
+            let relays = nprofile.relays;
+
+            for relay in relays.iter() {
+                client.add_write_relay(relay).await?;
+            }
+
+            client.connect().await;
+
+            let gift_wrap = client
+                .gift_wrap_to(relays, &nprofile.public_key, rumor, None)
+                .await?;
+
+            println!(
+                "Published event {} succufully to {}",
+                gift_wrap.val,
+                gift_wrap
+                    .success
+                    .iter()
+                    .map(|s| s.to_string())
+                    .collect::<Vec<_>>()
+                    .join(", ")
+            );
+
+            if !gift_wrap.failed.is_empty() {
+                println!(
+                    "Could not publish to {:?}",
+                    gift_wrap
+                        .failed
+                        .keys()
+                        .map(|relay| relay.to_string())
+                        .collect::<Vec<_>>()
+                        .join(", ")
+                );
+            }
+        }
+
+        TransportType::HttpPost => {
+            let client = Client::new();
+
+            let res = client
+                .post(transport.target.clone())
+                .json(&payload)
+                .send()
+                .await?;
+
+            let status = res.status();
+            if status.is_success() {
+                println!("Successfully posted payment");
+            } else {
+                println!("{:?}", res);
+                println!("Error posting payment");
+            }
+        }
+    }
+
+    Ok(())
+}