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address.go
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address.go
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// Go Substrate RPC Client (GSRPC) provides APIs and types around Polkadot and any Substrate-based chain RPC calls
//
// Copyright 2019 Centrifuge GmbH
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package types
import (
"fmt"
"github.com/centrifuge/go-substrate-rpc-client/v4/scale"
"github.com/centrifuge/go-substrate-rpc-client/v4/types/codec"
)
// Address is a wrapper around an AccountId or an AccountIndex. It is encoded with a prefix in case of an AccountID.
// Basically the Address is encoded as `[ <prefix-byte>, ...publicKey/...bytes ]` as per spec
type Address struct {
IsAccountID bool
AsAccountID AccountID
IsAccountIndex bool
AsAccountIndex AccountIndex
}
// NewAddressFromAccountID creates an Address from the given AccountID (public key)
func NewAddressFromAccountID(b []byte) (Address, error) {
accountID, err := NewAccountID(b)
if err != nil {
return Address{}, nil
}
return Address{
IsAccountID: true,
AsAccountID: *accountID,
}, nil
}
// NewAddressFromHexAccountID creates an Address from the given hex string that contains an AccountID (public key)
func NewAddressFromHexAccountID(str string) (Address, error) {
b, err := codec.HexDecodeString(str)
if err != nil {
return Address{}, err
}
return NewAddressFromAccountID(b)
}
// NewAddressFromAccountIndex creates an Address from the given AccountIndex
func NewAddressFromAccountIndex(u uint32) Address {
return Address{
IsAccountIndex: true,
AsAccountIndex: AccountIndex(u),
}
}
func (a *Address) Decode(decoder scale.Decoder) error {
b, err := decoder.ReadOneByte()
if err != nil {
return err
}
if defaultOptions.NoPalletIndices {
var sm [31]byte // Reading Address[32] minus b already read
err = decoder.Decode(&sm)
if err != nil {
return err
}
accountID, err := NewAccountID(append([]byte{b}, sm[:]...)) // Push b back to the front
if err != nil {
return err
}
a.AsAccountID = *accountID
a.IsAccountID = true
return nil
}
if b == 0xff {
err = decoder.Decode(&a.AsAccountID)
a.IsAccountID = true
return err
}
if b == 0xfe {
return fmt.Errorf("decoding of Address with 0xfe prefix not supported")
}
if b == 0xfd {
err = decoder.Decode(&a.AsAccountIndex)
a.IsAccountIndex = true
return err
}
if b == 0xfc {
var aIndex uint16
err = decoder.Decode(&aIndex)
a.IsAccountIndex = true
a.AsAccountIndex = AccountIndex(aIndex)
return err
}
a.IsAccountIndex = true
a.AsAccountIndex = AccountIndex(b)
return nil
}
func (a Address) Encode(encoder scale.Encoder) error {
// type of address - public key
if a.IsAccountID {
if !defaultOptions.NoPalletIndices { // Skip in case target chain doesn't include indices pallet
err := encoder.PushByte(255)
if err != nil {
return err
}
}
err := encoder.Write(a.AsAccountID[:])
if err != nil {
return err
}
return nil
}
if a.AsAccountIndex > 0xffff {
err := encoder.PushByte(253)
if err != nil {
return err
}
return encoder.Encode(a.AsAccountIndex)
}
if a.AsAccountIndex >= 0xf0 {
err := encoder.PushByte(252)
if err != nil {
return err
}
return encoder.Encode(uint16(a.AsAccountIndex))
}
return encoder.Encode(uint8(a.AsAccountIndex))
}