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// Copyright 2017 The go-ethereum Authors
// This file is part of the go-ethereum library.
//
// The go-ethereum library is free software: you can redistribute it and/or modify
// it under the terms of the GNU Lesser General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// The go-ethereum library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public License
// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
package accounts
import (
"math/big"
"github.com/ethereum/go-ethereum/common"
"github.com/ethereum/go-ethereum/core/types"
)
// Backend is an "account provider" that can specify a batch of accounts it can
// sign transactions with and upon request, do so.
type Backend interface {
// Accounts retrieves the list of signing accounts the backend is currently aware of.
Accounts() []Account
// HasAddress reports whether an account with the given address is present.
HasAddress(addr common.Address) bool
// SignHash requests the backend to sign the given hash.
//
// It looks up the account specified either solely via its address contained within,
// or optionally with the aid of any location metadata from the embedded URL field.
//
// If the backend requires additional authentication to sign the request (e.g.
// a password to decrypt the account, or a PIN code o verify the transaction),
// an AuthNeededError instance will be returned, containing infos for the user
// about which fields or actions are needed. The user may retry by providing
// the needed details via SignHashWithPassphrase, or by other means (e.g. unlock
// the account in a keystore).
SignHash(acc Account, hash []byte) ([]byte, error)
// SignTx requests the backend to sign the given transaction.
//
// It looks up the account specified either solely via its address contained within,
// or optionally with the aid of any location metadata from the embedded URL field.
//
// If the backend requires additional authentication to sign the request (e.g.
// a password to decrypt the account, or a PIN code o verify the transaction),
// an AuthNeededError instance will be returned, containing infos for the user
// about which fields or actions are needed. The user may retry by providing
// the needed details via SignTxWithPassphrase, or by other means (e.g. unlock
// the account in a keystore).
SignTx(acc Account, tx *types.Transaction, chainID *big.Int) (*types.Transaction, error)
// SignHashWithPassphrase requests the backend to sign the given transaction with
// the given passphrase as extra authentication information.
//
// It looks up the account specified either solely via its address contained within,
// or optionally with the aid of any location metadata from the embedded URL field.
SignHashWithPassphrase(acc Account, passphrase string, hash []byte) ([]byte, error)
// SignTxWithPassphrase requests the backend to sign the given transaction, with the
// given passphrase as extra authentication information.
//
// It looks up the account specified either solely via its address contained within,
// or optionally with the aid of any location metadata from the embedded URL field.
SignTxWithPassphrase(acc Account, passphrase string, tx *types.Transaction, chainID *big.Int) (*types.Transaction, error)
// TODO(karalabe,fjl): watching and caching needs the Go subscription system
// Watch requests the backend to send a notification to the specified channel whenever
// an new account appears or an existing one disappears.
//Watch(chan AccountEvent) error
// Unwatch requests the backend stop sending notifications to the given channel.
//Unwatch(chan AccountEvent) error
}
// TODO(karalabe,fjl): watching and caching needs the Go subscription system
// type AccountEvent struct {
// Account Account
// Added bool
// }
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