119 lines
3.6 KiB
Go
119 lines
3.6 KiB
Go
package walletunlocker
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import (
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"fmt"
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"github.com/lightningnetwork/lnd/lnrpc"
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"github.com/lightningnetwork/lnd/lnwallet/btcwallet"
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"github.com/roasbeef/btcd/chaincfg"
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"github.com/roasbeef/btcwallet/wallet"
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"golang.org/x/net/context"
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"gopkg.in/macaroon-bakery.v1/bakery"
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)
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// UnlockerService implements the WalletUnlocker service used to provide lnd
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// with a password for wallet encryption at startup.
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type UnlockerService struct {
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// CreatePasswords is a channel where passwords provided by the rpc
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// client to be used to initially create and encrypt a wallet will be
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// sent.
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CreatePasswords chan []byte
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// UnlockPasswords is a channel where passwords provided by the rpc
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// client to be used to unlock and decrypt an existing wallet will be
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// sent.
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UnlockPasswords chan []byte
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chainDir string
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netParams *chaincfg.Params
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}
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// New creates and returns a new UnlockerService.
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func New(authSvc *bakery.Service, chainDir string,
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params *chaincfg.Params) *UnlockerService {
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return &UnlockerService{
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CreatePasswords: make(chan []byte, 1),
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UnlockPasswords: make(chan []byte, 1),
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chainDir: chainDir,
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netParams: params,
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}
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}
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// CreateWallet will read the password provided in the CreateWalletRequest and
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// send it over the CreatePasswords channel in case no wallet already exist in
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// the chain's wallet database directory.
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func (u *UnlockerService) CreateWallet(ctx context.Context,
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in *lnrpc.CreateWalletRequest) (*lnrpc.CreateWalletResponse, error) {
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// Require the provided password to have a length of at
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// least 8 characters.
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password := in.Password
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if len(password) < 8 {
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return nil, fmt.Errorf("password must have " +
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"at least 8 characters")
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}
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netDir := btcwallet.NetworkDir(u.chainDir, u.netParams)
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loader := wallet.NewLoader(u.netParams, netDir)
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// Check if wallet already exists.
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walletExists, err := loader.WalletExists()
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if err != nil {
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return nil, err
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}
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if walletExists {
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// Cannot create wallet if it already exists!
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return nil, fmt.Errorf("wallet already exists")
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}
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// We send the password over the CreatePasswords channel, such that it
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// can be used by lnd to open or create the wallet.
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u.CreatePasswords <- password
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return &lnrpc.CreateWalletResponse{}, nil
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}
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// UnlockWallet sends the password provided by the incoming UnlockWalletRequest
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// over the UnlockPasswords channel in case it successfully decrypts an
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// existing wallet found in the chain's wallet database directory.
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func (u *UnlockerService) UnlockWallet(ctx context.Context,
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in *lnrpc.UnlockWalletRequest) (*lnrpc.UnlockWalletResponse, error) {
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netDir := btcwallet.NetworkDir(u.chainDir, u.netParams)
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loader := wallet.NewLoader(u.netParams, netDir)
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// Check if wallet already exists.
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walletExists, err := loader.WalletExists()
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if err != nil {
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return nil, err
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}
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if !walletExists {
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// Cannot unlock a wallet that does not exist!
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return nil, fmt.Errorf("wallet not found")
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}
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// Try opening the existing wallet with the provided password.
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_, err = loader.OpenExistingWallet(in.Password, false)
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if err != nil {
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// Could not open wallet, most likely this means that
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// provided password was incorrect.
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return nil, err
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}
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// We successfully opened the wallet, but we'll need to unload
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// it to make sure lnd can open it later.
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if err := loader.UnloadWallet(); err != nil {
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// TODO: not return error here?
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return nil, err
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}
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// At this point we was able to open the existing wallet with the
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// provided password. We send the password over the UnlockPasswords
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// channel, such that it can be used by lnd to open the wallet.
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u.UnlockPasswords <- in.Password
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return &lnrpc.UnlockWalletResponse{}, nil
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}
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