status-im/status-go

package personal

import (
    "context"
    "errors"
    "strings"
    "time"

    "github.com/ethereum/go-ethereum/common"
    "github.com/ethereum/go-ethereum/common/hexutil"

    "github.com/status-im/status-go/account"
    "github.com/status-im/status-go/eth-node/types"
    "github.com/status-im/status-go/params"
    "github.com/status-im/status-go/rpc"
)

var (
    // ErrInvalidPersonalSignAccount is returned when the account passed to
    // personal_sign isn't equal to the currently selected account.
    ErrInvalidPersonalSignAccount = errors.New("invalid account as only the selected one can generate a signature")
)

// SignParams required to sign messages
type SignParams struct {
    Data     interface{} `json:"data"`
    Address  string      `json:"account"`
    Password string      `json:"password"`
}

// RecoverParams are for calling `personal_ecRecover`
type RecoverParams struct {
    Message   string `json:"message"`
    Signature string `json:"signature"`
}

// PublicAPI represents a set of APIs from the `web3.personal` namespace.
type PublicAPI struct {
    rpcClient  *rpc.Client
    rpcTimeout time.Duration
}

// NewAPI creates an instance of the personal API.
func NewAPI() *PublicAPI {
    return &PublicAPI{
        rpcTimeout: 300 * time.Second,
    }
}

// SetRPC sets RPC params (client and timeout) for the API calls.
func (api *PublicAPI) SetRPC(rpcClient *rpc.Client, timeout time.Duration) {
    api.rpcClient = rpcClient
    api.rpcTimeout = timeout
}

// Recover is an implementation of `personal_ecRecover` or `web3.personal.ecRecover` API
func (api *PublicAPI) Recover(rpcParams RecoverParams) (addr types.Address, err error) {
    ctx, cancel := context.WithTimeout(context.Background(), api.rpcTimeout)
    defer cancel()
    var gethAddr common.Address
    err = api.rpcClient.CallContextIgnoringLocalHandlers(
        ctx,
        &gethAddr,
        api.rpcClient.UpstreamChainID,
        params.PersonalRecoverMethodName,
        rpcParams.Message, rpcParams.Signature)
    addr = types.Address(gethAddr)

    return
}

// Sign is an implementation of `personal_sign` or `web3.personal.sign` API
func (api *PublicAPI) Sign(rpcParams SignParams, verifiedAccount *account.SelectedExtKey) (result types.HexBytes, err error) {
    if !strings.EqualFold(rpcParams.Address, verifiedAccount.Address.Hex()) {
        err = ErrInvalidPersonalSignAccount
        return
    }

    ctx, cancel := context.WithTimeout(context.Background(), api.rpcTimeout)
    defer cancel()
    var gethResult hexutil.Bytes
    err = api.rpcClient.CallContextIgnoringLocalHandlers(
        ctx,
        &gethResult,
        api.rpcClient.UpstreamChainID,
        params.PersonalSignMethodName,
        rpcParams.Data, rpcParams.Address, rpcParams.Password)
    result = types.HexBytes(gethResult)

    return
}