feat: add non-persisted Async Payjoin support

Cargo.toml

@@ -21,6 +21,8 @@ serde_json = "1.0"
 thiserror = "2.0.11"
 tokio = { version = "1", features = ["full"] }
 cli-table = "0.5.0"
+tracing = "0.1.41"
+tracing-subscriber = "0.3.20"
 
 # Optional dependencies
 bdk_bitcoind_rpc = { version = "0.21.0", features = ["std"], optional = true }
@@ -29,8 +31,9 @@ bdk_esplora = { version = "0.22.1", features = ["async-https", "tokio"], optiona
 bdk_kyoto = { version = "0.15.1", optional = true }
 bdk_redb = { version = "0.1.0", optional = true }
 shlex = {  version = "1.3.0", optional = true }
-tracing = "0.1.41"
-tracing-subscriber = "0.3.20"
+payjoin = { version = "1.0.0-rc.0", features = ["v1", "v2", "io", "_test-utils"], optional = true}
+reqwest = { version = "0.12.23", default-features = false, optional = true }
+url = { version = "2.5.4", optional = true }
 
 [features]
 default = ["repl", "sqlite"]
@@ -43,10 +46,13 @@ sqlite = ["bdk_wallet/rusqlite"]
 redb = ["bdk_redb"]
 
 # Available blockchain client options
-cbf = ["bdk_kyoto"]
-electrum = ["bdk_electrum"]
-esplora = ["bdk_esplora"]
-rpc = ["bdk_bitcoind_rpc"]
+cbf = ["bdk_kyoto", "_payjoin-dependencies"]
+electrum = ["bdk_electrum", "_payjoin-dependencies"]
+esplora = ["bdk_esplora", "_payjoin-dependencies"]
+rpc = ["bdk_bitcoind_rpc", "_payjoin-dependencies"] 
+
+# Internal features
+_payjoin-dependencies = ["payjoin", "reqwest", "url"]
 
 # Use this to consensus verify transactions at sync time
 verify = []

README.md

@@ -35,6 +35,7 @@ And yes, it can do Taproot!!
 This crate can be used for the following purposes:
  - Instantly create a miniscript based wallet and connect to your backend of choice (Electrum, Esplora, Core RPC, Kyoto etc) and quickly play around with your own complex bitcoin scripting workflow. With one or many wallets, connected with one or many backends.
  - The `tests/integration.rs` module is used to document high level complex workflows between BDK and different Bitcoin infrastructure systems, like Core, Electrum and Lightning(soon TM).
+ - Receive and send Async Payjoins. Note that even though Async Payjoin as a protocol allows the receiver and sender to go offline during the payjoin, the BDK CLI implementation currently does not support persisting.
  - (Planned) Expose the basic command handler via `wasm` to integrate `bdk-cli` functionality natively into the web platform. See also the [playground](https://bitcoindevkit.org/bdk-cli/playground/) page.
 
 If you are considering using BDK in your own wallet project bdk-cli is a nice playground to get started with. It allows easy testnet and regtest wallet operations, to try out what's possible with descriptors, miniscript, and BDK APIs. For more information on BDK refer to the [website](https://bitcoindevkit.org/) and the [rust docs](https://docs.rs/bdk_wallet/1.0.0/bdk_wallet/index.html)

src/commands.rs

@@ -430,6 +430,41 @@ 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.
+        #[arg(env = "PAYJOIN_URI", long = "uri", required = true)]
+        uri: 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>,
+        /// Fee rate to use in sat/vbyte.
+        #[arg(
+            env = "PAYJOIN_SENDER_FEE_RATE",
+            short = 'f',
+            long = "fee_rate",
+            required = true
+        )]
+        fee_rate: u64,
+    },
 }
 
 /// Subcommands for Key operations.

src/error.rs

@@ -103,6 +103,15 @@ pub enum BDKCliError {
     #[cfg(feature = "cbf")]
     #[error("BDK-Kyoto update error: {0}")]
     KyotoUpdateError(#[from] bdk_kyoto::UpdateError),
+
+    #[cfg(any(
+        feature = "electrum",
+        feature = "esplora",
+        feature = "rpc",
+        feature = "cbf",
+    ))]
+    #[error("Reqwest error: {0}")]
+    ReqwestError(#[from] reqwest::Error),
 }
 
 impl From<ExtractTxError> for BDKCliError {