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improve: handle not enough change outputs provided

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This commit is contained in:
thesimplekid
2023-11-28 22:09:55 +00:00
parent a1eae5f76c
commit 4e0e91cf7f
1 changed files with 32 additions and 11 deletions
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43
crates/cashu-sdk/src/mint.rs
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@@ -11,7 +11,7 @@ use cashu::nuts::{CheckSpendableRequest, CheckSpendableResponse};
use cashu::secret::Secret;
use cashu::types::KeysetInfo;
use cashu::Amount;
use tracing::debug;
use tracing::{debug, info};
pub struct Mint {
// pub pubkey: PublicKey,
@@ -300,25 +300,46 @@ impl Mint {
self.spent_secrets.insert(secret);
}
let change_target = melt_request.proofs_amount() - total_spent;
let amounts = change_target.split();
let mut change = Vec::with_capacity(amounts.len());
let mut change = None;
if let Some(outputs) = &melt_request.outputs {
for (i, amount) in amounts.iter().enumerate() {
let mut message = outputs[i].clone();
if let Some(outputs) = melt_request.outputs.clone() {
let change_target = melt_request.proofs_amount() - total_spent;
let mut amounts = change_target.split();
let mut change_sigs = Vec::with_capacity(amounts.len());
message.amount = *amount;
if outputs.len().lt(&amounts.len()) {
debug!(
"Providing change requires {} blinded messages, but only {} provided",
amounts.len(),
outputs.len()
);
let signature = self.blind_sign(&message)?;
change.push(signature)
// In the case that not enough outputs are provided to return all change
// Reverse sort the amounts so that the most amount of change possible is
// returned. The rest is burnt
amounts.sort_by(|a, b| b.cmp(a));
}
for (amount, blinded_message) in amounts.iter().zip(outputs) {
let mut blinded_message = blinded_message;
blinded_message.amount = *amount;
let signature = self.blind_sign(&blinded_message)?;
change_sigs.push(signature)
}
change = Some(change_sigs);
} else {
info!(
"No change outputs provided. Burnt: {} sats",
(melt_request.proofs_amount() - total_spent).to_sat()
);
}
Ok(MeltResponse {
paid: true,
preimage: Some(preimage.to_string()),
change: Some(change),
change,
})
}
}