From 86896c822317ab108541acbf0622d94a9119c479 Mon Sep 17 00:00:00 2001
From: edouard <m@edouard.paris>
Date: Mon, 9 Jan 2023 11:41:43 +0100
Subject: [PATCH] Check output amount superior to dust value

close #237
---
 gui/src/app/state/spend/step.rs | 7 +++++++
 gui/src/app/view/spend/step.rs  | 4 ++--
 2 files changed, 9 insertions(+), 2 deletions(-)

diff --git a/gui/src/app/state/spend/step.rs b/gui/src/app/state/spend/step.rs
index 49f3e7d8..933c929b 100644
--- a/gui/src/app/state/spend/step.rs
+++ b/gui/src/app/state/spend/step.rs
@@ -21,6 +21,9 @@ use crate::{
     ui::component::form,
 };
 
+/// See: https://github.com/wizardsardine/liana/blob/master/src/commands/mod.rs#L32
+const DUST_OUTPUT_SATS: u64 = 5_000;
+
 #[derive(Default, Clone)]
 pub struct TransactionDraft {
     inputs: Vec<Coin>,
@@ -162,6 +165,10 @@ impl Recipient {
             return Err(Error::Unexpected("Amount should be non-zero".to_string()));
         }
 
+        if amount.to_sat() < DUST_OUTPUT_SATS {
+            return Err(Error::Unexpected("Amount should be non-zero".to_string()));
+        }
+
         if let Ok(address) = Address::from_str(&self.address.value) {
             if amount <= address.script_pubkey().dust_value() {
                 return Err(Error::Unexpected(
diff --git a/gui/src/app/view/spend/step.rs b/gui/src/app/view/spend/step.rs
index 18e0179b..f1dfbd85 100644
--- a/gui/src/app/view/spend/step.rs
+++ b/gui/src/app/view/spend/step.rs
@@ -100,11 +100,11 @@ pub fn recipient_view<'a>(
                 form::Form::new("Amount", amount, move |msg| {
                     CreateSpendMessage::RecipientEdited(index, "amount", msg)
                 })
-                .warning("Please enter correct amount")
+                .warning("Please enter correct amount (> 5000 sats)")
                 .size(20)
                 .padding(10),
             )
-            .width(Length::Units(250)),
+            .width(Length::Units(300)),
         )
         .spacing(5)
         .push(