bug: support base denoms with slashes (backport #978) (#1018)

* bug: support base denoms with slashes (#978)

* bug: support base denoms with slashes

* add changelog entry

Co-authored-by: Carlos Rodriguez <crodveg@gmail.com>
(cherry picked from commit 4545154)

# Conflicts:
#	CHANGELOG.md

* fix conflicts

Co-authored-by: Carlos Rodriguez <carlos@interchain.io>
Co-authored-by: Carlos Rodriguez <crodveg@gmail.com>

Author: mergify[bot]

CHANGELOG.md

@@ -43,7 +43,11 @@ Ref: https://keepachangelog.com/en/1.0.0/
 
 ### Features
 
- * [\#679](https://github.com/cosmos/ibc-go/pull/679) New CLI command `query ibc-transfer denom-hash <denom trace>` to get the denom hash for a denom trace; this might be useful for debug
+* [\#679](https://github.com/cosmos/ibc-go/pull/679) New CLI command `query ibc-transfer denom-hash <denom trace>` to get the denom hash for a denom trace; this might be useful for debug
+
+### Bug Fixes
+
+* (transfer) [\#978](https://github.com/cosmos/ibc-go/pull/978) Support base denoms with slashes in denom validation
 
 ## [v2.0.3](https://github.com/cosmos/ibc-go/releases/tag/v2.0.2) - 2022-02-03
 

modules/apps/transfer/types/msgs_test.go

@@ -32,7 +32,7 @@ var (
 
 	coin             = sdk.NewCoin("atom", sdk.NewInt(100))
 	ibcCoin          = sdk.NewCoin("ibc/7F1D3FCF4AE79E1554D670D1AD949A9BA4E4A3C76C63093E17E446A46061A7A2", sdk.NewInt(100))
-	invalidIBCCoin   = sdk.NewCoin("notibc/7F1D3FCF4AE79E1554D670D1AD949A9BA4E4A3C76C63093E17E446A46061A7A2", sdk.NewInt(100))
+	invalidIBCCoin   = sdk.NewCoin("ibc/7F1D3FCF4AE79E1554", sdk.NewInt(100))
 	invalidDenomCoin = sdk.Coin{Denom: "0atom", Amount: sdk.NewInt(100)}
 	zeroCoin         = sdk.Coin{Denom: "atoms", Amount: sdk.NewInt(0)}
 

modules/apps/transfer/types/trace.go

@@ -162,7 +162,7 @@ func ValidatePrefixedDenom(denom string) error {
 
 // ValidateIBCDenom validates that the given denomination is either:
 //
-//  - A valid base denomination (eg: 'uatom')
+//  - A valid base denomination (eg: 'uatom' or 'gamm/pool/1' as in https://github.com/cosmos/ibc-go/issues/894)
 //  - A valid fungible token representation (i.e 'ibc/{hash}') per ADR 001 https://github.com/cosmos/ibc-go/blob/main/docs/architecture/adr-001-coin-source-tracing.md
 func ValidateIBCDenom(denom string) error {
 	if err := sdk.ValidateDenom(denom); err != nil {
@@ -172,17 +172,17 @@ func ValidateIBCDenom(denom string) error {
 	denomSplit := strings.SplitN(denom, "/", 2)
 
 	switch {
-	case strings.TrimSpace(denom) == "",
-		len(denomSplit) == 1 && denomSplit[0] == DenomPrefix,
-		len(denomSplit) == 2 && (denomSplit[0] != DenomPrefix || strings.TrimSpace(denomSplit[1]) == ""):
+	case denom == DenomPrefix:
 		return sdkerrors.Wrapf(ErrInvalidDenomForTransfer, "denomination should be prefixed with the format 'ibc/{hash(trace + \"/\" + %s)}'", denom)
 
-	case denomSplit[0] == denom && strings.TrimSpace(denom) != "":
-		return nil
-	}
+	case len(denomSplit) == 2 && denomSplit[0] == DenomPrefix:
+		if strings.TrimSpace(denomSplit[1]) == "" {
+			return sdkerrors.Wrapf(ErrInvalidDenomForTransfer, "denomination should be prefixed with the format 'ibc/{hash(trace + \"/\" + %s)}'", denom)
+		}
 
-	if _, err := ParseHexHash(denomSplit[1]); err != nil {
-		return sdkerrors.Wrapf(err, "invalid denom trace hash %s", denomSplit[1])
+		if _, err := ParseHexHash(denomSplit[1]); err != nil {
+			return sdkerrors.Wrapf(err, "invalid denom trace hash %s", denomSplit[1])
+		}
 	}
 
 	return nil

modules/apps/transfer/types/trace_test.go

@@ -131,11 +131,12 @@ func TestValidateIBCDenom(t *testing.T) {
 	}{
 		{"denom with trace hash", "ibc/7F1D3FCF4AE79E1554D670D1AD949A9BA4E4A3C76C63093E17E446A46061A7A2", false},
 		{"base denom", "uatom", false},
+		{"base denom with single '/'s", "gamm/pool/1", false},
+		{"base denom with double '/'s", "gamm//pool//1", false},
+		{"non-ibc prefix with hash", "notibc/7F1D3FCF4AE79E1554D670D1AD949A9BA4E4A3C76C63093E17E446A46061A7A2", false},
 		{"empty denom", "", true},
-		{"invalid prefixed denom", "transfer/channelToA/uatom", true},
 		{"denom 'ibc'", "ibc", true},
 		{"denom 'ibc/'", "ibc/", true},
-		{"invald prefix", "notibc/7F1D3FCF4AE79E1554D670D1AD949A9BA4E4A3C76C63093E17E446A46061A7A2", true},
 		{"invald hash", "ibc/!@#$!@#", true},
 	}