Create utility func to convert HRP addresses (ava-labs#986)

create utility func to convert addresses

Co-authored-by: StephenButtolph <[email protected]>

Author: holisticode

utils/formatting/address_converter.go

@@ -0,0 +1,24 @@
+// (c) 2021, Ava Labs, Inc. All rights reserved.
+// See the file LICENSE for licensing terms.
+
+package formatting
+
+// ConvertAddresses converts a list of addresses with arbitrary chains and HRPs
+// (e.g. X-local1....) to a list of addresses with the provided format
+// (e.g. P-custom1...).
+func ConvertAddresses(destChain string, toHRP string, addresses []string) ([]string, error) {
+	convertedAddrs := make([]string, len(addresses))
+	for i, addr := range addresses {
+		_, _, addrBytes, err := ParseAddress(addr)
+		if err != nil {
+			return nil, err
+		}
+
+		newAddrStr, err := FormatAddress(destChain, toHRP, addrBytes)
+		if err != nil {
+			return nil, err
+		}
+		convertedAddrs[i] = newAddrStr
+	}
+	return convertedAddrs, nil
+}

utils/formatting/address_converter_test.go

@@ -0,0 +1,70 @@
+// (c) 2021, Ava Labs, Inc. All rights reserved.
+// See the file LICENSE for licensing terms.
+
+package formatting
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+)
+
+func TestAddressConversion(t *testing.T) {
+	assert := assert.New(t)
+
+	tests := []struct {
+		chain         string
+		hrp           string
+		srcAddrs      []string
+		expectedErr   error
+		expectedAddrs []string
+	}{
+		{
+			chain: "X",
+			hrp:   "custom",
+			srcAddrs: []string{
+				"X-local1g65uqn6t77p656w64023nh8nd9updzmxyymev2",
+				"X-local18jma8ppw3nhx5r4ap8clazz0dps7rv5u00z96u",
+			},
+			expectedAddrs: []string{
+				"X-custom1g65uqn6t77p656w64023nh8nd9updzmxwd59gh",
+				"X-custom18jma8ppw3nhx5r4ap8clazz0dps7rv5u9xde7p",
+			},
+		},
+		{
+			chain: "X",
+			hrp:   "local",
+			srcAddrs: []string{
+				"X-local1g65uqn6t77p656w64023nh8nd9updzmxyymev2",
+				"X-local18jma8ppw3nhx5r4ap8clazz0dps7rv5u00z96u",
+			},
+			expectedAddrs: []string{
+				"X-local1g65uqn6t77p656w64023nh8nd9updzmxyymev2",
+				"X-local18jma8ppw3nhx5r4ap8clazz0dps7rv5u00z96u",
+			},
+		},
+		{
+			srcAddrs: []string{
+				"X-local1g65uqn6t77p656w64023nh8nd9updzmxyymev2",
+			},
+			expectedAddrs: []string{
+				"-1g65uqn6t77p656w64023nh8nd9updzmx4x372p",
+			},
+		},
+		{
+			srcAddrs: []string{
+				"not a valid address",
+			},
+			expectedErr: errNoSeparator,
+		},
+	}
+	for _, test := range tests {
+		result, err := ConvertAddresses(test.chain, test.hrp, test.srcAddrs)
+		assert.Equal(test.expectedErr, err)
+		assert.Len(result, len(test.expectedAddrs))
+		for i, want := range test.expectedAddrs {
+			got := result[i]
+			assert.Equal(want, got)
+		}
+	}
+}