From 5f4b0e55ca931062b0884a1cd79a82d8e9bb4c43 Mon Sep 17 00:00:00 2001
From: Yuki Kishimoto <yukikishimoto@protonmail.com>
Date: Tue, 23 Jan 2024 18:14:57 +0100
Subject: [PATCH] Add `WebLN::send_multi_payment`

---
 webln-js/src/lib.rs | 11 +++++++++++
 webln/src/lib.rs    | 23 +++++++++++++++++++++++
 2 files changed, 34 insertions(+)

diff --git a/webln-js/src/lib.rs b/webln-js/src/lib.rs
index 87c7560..8e1e7e5 100644
--- a/webln-js/src/lib.rs
+++ b/webln-js/src/lib.rs
@@ -8,6 +8,8 @@
 
 extern crate alloc;
 
+use alloc::string::String;
+use alloc::vec::Vec;
 use core::ops::Deref;
 
 use wasm_bindgen::prelude::*;
@@ -115,6 +117,15 @@ impl JsWebLN {
             .into())
     }
 
+    /// Request that the user sends multiple payments.
+    #[wasm_bindgen(js_name = sendMultiPayment)]
+    pub async fn send_multi_payment(&self, invoices: Vec<String>) -> Result<()> {
+        self.inner
+            .send_multi_payment(invoices)
+            .await
+            .map_err(into_err)
+    }
+
     /// Request that the user sends a payment for an invoice.
     /// The payment will only be initiated and will not wait for a preimage to be returned.
     /// This is useful when paying HOLD Invoices. There is no guarantee that the payment will be successfully sent to the receiver.
diff --git a/webln/src/lib.rs b/webln/src/lib.rs
index bc1fef5..d17ba08 100644
--- a/webln/src/lib.rs
+++ b/webln/src/lib.rs
@@ -31,6 +31,7 @@ const GET_INFO: &str = "getInfo";
 const KEYSEND: &str = "keysend";
 const MAKE_INVOICE: &str = "makeInvoice";
 const SEND_PAYMENT: &str = "sendPayment";
+const SEND_MULTI_PAYMENT: &str = "sendMultiPayment";
 const SEND_PAYMENT_ASYNC: &str = "sendPaymentAsync";
 const SIGN_MESSAGE: &str = "signMessage";
 const VERIFY_MESSAGE: &str = "verifyMessage";
@@ -111,6 +112,7 @@ pub enum GetInfoMethod {
     Keysend,
     MakeInvoice,
     SendPayment,
+    SendMultiPayment,
     SendPaymentAsync,
     SignMessage,
     VerifyMessage,
@@ -131,6 +133,7 @@ impl From<&str> for GetInfoMethod {
             KEYSEND => Self::Keysend,
             MAKE_INVOICE => Self::MakeInvoice,
             SEND_PAYMENT => Self::SendPayment,
+            SEND_MULTI_PAYMENT => Self::SendMultiPayment,
             SEND_PAYMENT_ASYNC => Self::SendPaymentAsync,
             SIGN_MESSAGE => Self::SignMessage,
             VERIFY_MESSAGE => Self::VerifyMessage,
@@ -153,6 +156,7 @@ impl fmt::Display for GetInfoMethod {
             Self::Keysend => write!(f, "{KEYSEND}"),
             Self::MakeInvoice => write!(f, "{MAKE_INVOICE}"),
             Self::SendPayment => write!(f, "{SEND_PAYMENT}"),
+            Self::SendMultiPayment => write!(f, "{SEND_MULTI_PAYMENT}"),
             Self::SendPaymentAsync => write!(f, "{SEND_PAYMENT_ASYNC}"),
             Self::SignMessage => write!(f, "{SIGN_MESSAGE}"),
             Self::VerifyMessage => write!(f, "{VERIFY_MESSAGE}"),
@@ -483,6 +487,25 @@ impl WebLN {
         })
     }
 
+    /// Request that the user sends multiple payments.
+    pub async fn send_multi_payment<I, S>(&self, invoices: I) -> Result<(), Error>
+    where
+        I: IntoIterator<Item = S>,
+        S: AsRef<str>,
+    {
+        let invoices: Array = invoices
+            .into_iter()
+            .map(|i| JsValue::from_str(i.as_ref()))
+            .collect();
+        let func: Function = self.get_func(&self.webln_obj, SEND_MULTI_PAYMENT)?;
+        let promise: Promise = Promise::resolve(&func.call1(&self.webln_obj, &invoices.into())?);
+        let result: JsValue = JsFuture::from(promise).await?;
+        let _send_multi_payment_obj: Object =
+            result.dyn_into().map_err(|_| Error::SomethingGoneWrong)?;
+        // TODO: deserialize response
+        Ok(())
+    }
+
     /// Request that the user sends a payment for an invoice.
     /// The payment will only be initiated and will not wait for a preimage to be returned.
     /// This is useful when paying HOLD Invoices. There is no guarantee that the payment will be successfully sent to the receiver.