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backend.go
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backend.go
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// Copyright 2019 - See NOTICE file for copyright holders.
//
// 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 wallet
import (
"io"
)
// backend is set to the global wallet backend. Must not be set directly but
// through importing the needed backend.
var backend Backend
// Backend provides useful methods for this blockchain.
type Backend interface {
// DecodeAddress reads and decodes an address from an io.Writer
DecodeAddress(io.Reader) (Address, error)
// DecodeSig reads a signature from the provided stream. It is needed for
// decoding of wire messages.
DecodeSig(io.Reader) (Sig, error)
// VerifySignature verifies if this signature was signed by this address.
// It should return an error iff the signature or message are malformed.
// If the signature does not match the address it should return false, nil
VerifySignature(msg []byte, sign Sig, a Address) (bool, error)
}
// SetBackend sets the global wallet backend. Must not be called directly but
// through importing the needed backend.
func SetBackend(b Backend) {
if backend != nil {
panic("wallet backend already set")
}
backend = b
}
// DecodeAddress calls DecodeAddress of the current backend.
func DecodeAddress(r io.Reader) (Address, error) {
return backend.DecodeAddress(r)
}
// DecodeSig calls DecodeSig of the current backend.
func DecodeSig(r io.Reader) (Sig, error) {
return backend.DecodeSig(r)
}
// VerifySignature calls VerifySignature of the current backend.
func VerifySignature(msg []byte, sign Sig, a Address) (bool, error) {
return backend.VerifySignature(msg, sign, a)
}