From e5ecd74eb924af9f202c19ae673a34c968832ecf Mon Sep 17 00:00:00 2001
From: elnosh <elnosh@pm.me>
Date: Wed, 22 May 2024 12:38:43 -0500
Subject: [PATCH] mint - only check if proofs are below outputs in swap

---
 cashu/cashu.go | 2 +-
 mint/mint.go   | 6 +++---
 2 files changed, 4 insertions(+), 4 deletions(-)

diff --git a/cashu/cashu.go b/cashu/cashu.go
index 5417f3a..2d19e6b 100644
--- a/cashu/cashu.go
+++ b/cashu/cashu.go
@@ -172,7 +172,7 @@ var (
 	InvoiceTokensIssuedErr   = Error{Detail: "tokens already issued for invoice", Code: InvoiceErrCode}
 	ProofAlreadyUsedErr      = Error{Detail: "proofs already used", Code: ProofsErrCode}
 	InvalidProofErr          = Error{Detail: "invalid proof", Code: ProofsErrCode}
-	AmountsDoNotMatch        = Error{Detail: "amounts do not match", Code: ProofsErrCode}
+	InputsBelowOutputs       = Error{Detail: "amount of input proofs is below amount of outputs", Code: ProofsErrCode}
 	MeltQuoteNotExistErr     = Error{Detail: "melt quote does not exist", Code: QuoteErrCode}
 	InsufficientProofsAmount = Error{Detail: "insufficient amount in proofs", Code: ProofsErrCode}
 	InvalidKeysetProof       = Error{Detail: "proof from an invalid keyset", Code: ProofsErrCode}
diff --git a/mint/mint.go b/mint/mint.go
index 75e550d..886a554 100644
--- a/mint/mint.go
+++ b/mint/mint.go
@@ -208,8 +208,8 @@ func (m *Mint) Swap(proofs cashu.Proofs, blindedMessages cashu.BlindedMessages)
 		blindedMessagesAmount += msg.Amount
 	}
 
-	if proofsAmount != blindedMessagesAmount {
-		return nil, cashu.AmountsDoNotMatch
+	if proofsAmount < blindedMessagesAmount {
+		return nil, cashu.InputsBelowOutputs
 	}
 
 	valid, err := m.VerifyProofs(proofs)
@@ -221,7 +221,7 @@ func (m *Mint) Swap(proofs cashu.Proofs, blindedMessages cashu.BlindedMessages)
 	// by adding them to the db
 	blindedSignatures, err := m.signBlindedMessages(blindedMessages)
 	if err != nil {
-		return nil, cashu.BuildCashuError(err.Error(), cashu.StandardErrCode)
+		return nil, err
 	}
 
 	for _, proof := range proofs {