feat: add payjoin receive support

Author: mehmetefeumit

src/commands.rs

@@ -430,6 +430,23 @@ pub enum OnlineWalletSubCommand {
         )]
         tx: Option<String>,
     },
+    // Generates a Payjoin receive URI and processes the sender's Payjoin proposal.
+    ReceivePayjoin {
+        /// Amount to be received in sats.
+        #[arg(env = "PAYJOIN_AMOUNT", long = "amount", required = true)]
+        amount: u64,
+        /// Payjoin directory which will be used to store the PSBTs which are pending action
+        /// from one of the parties.
+        #[arg(env = "PAYJOIN_DIRECTORY", long = "directory", required = true)]
+        directory: String,
+        /// URL of the Payjoin OHTTP relay. Can be repeated multiple times to attempt the
+        /// operation with multiple relays for redundancy.
+        #[arg(env = "PAYJOIN_OHTTP_RELAY", long = "ohttp_relay", required = true)]
+        ohttp_relay: Vec<String>,
+        /// Maximum effective fee rate the receiver is willing to pay for their own input/output contributions.
+        #[arg(env = "PAYJOIN_RECEIVER_MAX_FEE_RATE", long = "max_fee_rate")]
+        max_fee_rate: Option<u64>,
+    },
     /// Sends an original PSBT to a BIP 21 URI and broadcasts the returned Payjoin PSBT.
     SendPayjoin {
         /// BIP 21 URI for the Payjoin.

src/handlers.rs

@@ -9,7 +9,6 @@
 //! Command Handlers
 //!
 //! This module describes all the command handling logic used by bdk-cli.
-
 use crate::commands::OfflineWalletSubCommand::*;
 use crate::commands::*;
 use crate::error::BDKCliError as Error;
@@ -721,6 +720,18 @@ pub(crate) async fn handle_online_wallet_subcommand(
             let txid = broadcast_transaction(client, tx).await?;
             Ok(serde_json::to_string_pretty(&json!({ "txid": txid }))?)
         }
+        ReceivePayjoin {
+            amount,
+            directory,
+            ohttp_relay,
+            max_fee_rate,
+        } => {
+            let relay_manager = Arc::new(Mutex::new(RelayManager::new()));
+            let mut payjoin_manager = PayjoinManager::new(wallet, relay_manager);
+            return payjoin_manager
+                .receive_payjoin(amount, directory, max_fee_rate, ohttp_relay, client)
+                .await;
+        }
         SendPayjoin {
             uri,
             ohttp_relay,