/
multisign.go
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/
multisign.go
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// Copyright © 2021, 2022 Attestant Limited.
// 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 standard
import (
context "context"
"fmt"
"sync"
"time"
"github.com/attestantio/dirk/core"
"github.com/attestantio/dirk/rules"
"github.com/attestantio/dirk/services/checker"
"github.com/attestantio/dirk/services/ruler"
"github.com/attestantio/dirk/util"
"github.com/pkg/errors"
e2wtypes "github.com/wealdtech/go-eth2-wallet-types/v2"
"go.opentelemetry.io/otel"
"go.opentelemetry.io/otel/attribute"
"go.opentelemetry.io/otel/codes"
)
// Multisign signs multiple generic data.
func (s *Service) Multisign(ctx context.Context,
credentials *checker.Credentials,
accountNames []string,
pubKeys [][]byte,
data []*rules.SignData) (
[]core.Result,
[][]byte,
) {
ctx, span := otel.Tracer("attestantio.dirk.services.signer.standard").Start(ctx, "Multisign")
defer span.End()
started := time.Now()
if len(data) == 0 {
log.Warn().Str("result", "denied").Msg("Request empty")
span.SetStatus(codes.Error, "Request empty")
s.monitor.SignCompleted(started, "generic", core.ResultDenied)
results := make([]core.Result, 1)
results[0] = core.ResultDenied
return results, nil
}
results := make([]core.Result, len(data))
for i := range results {
results[i] = core.ResultUnknown
}
if credentials == nil {
log.Error().Msg("No credentials supplied")
for i := range results {
results[i] = core.ResultDenied
}
return results, nil
}
span.SetAttributes(attribute.String("client", credentials.Client))
log := log.With().
Str("request_id", credentials.RequestID).
Str("client", credentials.Client).
Str("action", "Multisign").
Logger()
log.Trace().Msg("Signing")
signatures := make([][]byte, len(data))
// Check input.
for i := range data {
if err := checkSignData(data[i]); err != nil {
log.Warn().Err(err).Str("result", "denied").Msg("Check failed")
s.monitor.SignCompleted(started, "generic", core.ResultDenied)
results[i] = core.ResultDenied
return results, nil
}
if e := log.Trace(); e.Enabled() {
e.Int("position", i).
Str("domain", fmt.Sprintf("%#x", data[i].Domain)).
Str("data", fmt.Sprintf("%#x", data[i].Data))
if len(accountNames) > i && len(accountNames[i]) > 0 {
e.Str("account", accountNames[i])
}
if len(pubKeys) > i && len(pubKeys[i]) > 0 {
e.Str("pubkey", fmt.Sprintf("%#x", pubKeys[i]))
}
e.Msg("Data to sign")
}
}
// We could have either or both of account names and/or entries, so take the longer
entries := len(pubKeys)
if len(accountNames) > entries {
entries = len(accountNames)
}
span.SetAttributes(attribute.Int("requests", entries))
rulesData := make([]*ruler.RulesData, entries)
accounts := make([]e2wtypes.Account, entries)
_, err := util.Scatter(entries, func(offset int, entries int, _ *sync.RWMutex) (interface{}, error) {
for i := offset; i < offset+entries; i++ {
var pubKey []byte
if len(pubKeys) > i {
pubKey = pubKeys[i]
}
var accountName string
if len(accountNames) > i {
accountName = accountNames[i]
}
wallet, account, checkRes := s.preCheck(ctx, credentials, accountName, pubKey, ruler.ActionSign)
if checkRes != core.ResultSucceeded {
s.monitor.SignCompleted(started, "generic", checkRes)
results[i] = checkRes
continue
}
rulesData[i] = &ruler.RulesData{
WalletName: wallet.Name(),
AccountName: account.Name(),
PubKey: account.PublicKey().Marshal(),
Data: data[i],
}
accounts[i] = account
}
return nil, nil
})
if err != nil {
log.Error().Err(err).Str("result", "failed").Msg("Failed to scatter check")
}
for i := range results {
if results[i] != core.ResultUnknown && results[i] != core.ResultSucceeded {
s.monitor.SignCompleted(started, "generic", results[i])
return results, nil
}
}
log.Trace().Dur("elapsed", time.Since(started)).Msg("Completed precheck")
// Confirm approval via rules.
rulesResults := s.ruler.RunRules(ctx, credentials, ruler.ActionSign, rulesData)
log.Trace().Dur("elapsed", time.Since(started)).Msg("Completed rules")
// Carry out the signing.
_, err = util.Scatter(len(rulesResults), func(offset int, entries int, _ *sync.RWMutex) (interface{}, error) {
for i := offset; i < offset+entries; i++ {
switch rulesResults[i] {
case rules.UNKNOWN:
log.Debug().Str("result", "failed").Msg("Unknown result from rules")
s.monitor.SignCompleted(started, "generic", core.ResultFailed)
results[i] = core.ResultFailed
continue
case rules.DENIED:
log.Debug().Str("result", "denied").Msg("Denied by rules")
s.monitor.SignCompleted(started, "generic", core.ResultDenied)
results[i] = core.ResultDenied
continue
case rules.FAILED:
log.Error().Str("result", "failed").Msg("Rules check failed")
s.monitor.SignCompleted(started, "generic", core.ResultFailed)
results[i] = core.ResultFailed
continue
case rules.APPROVED:
// Nothing to do.
}
signingRoot, err := generateSigningRoot(ctx, data[i].Data, data[i].Domain)
if err != nil {
log.Error().Err(err).Str("result", "failed").Msg("Failed to generate signing root")
s.monitor.SignCompleted(started, "generic", core.ResultFailed)
results[i] = core.ResultFailed
continue
}
// Sign it.
signature, err := signRoot(ctx, accounts[i], signingRoot[:])
if err != nil {
log.Error().Err(err).Str("result", "failed").Msg("Failed to sign")
s.monitor.SignCompleted(started, "generic", core.ResultFailed)
results[i] = core.ResultFailed
continue
}
log.Trace().Str("result", "succeeded").Msg("Success")
s.monitor.SignCompleted(started, "generic", core.ResultSucceeded)
results[i] = core.ResultSucceeded
signatures[i] = signature
}
return nil, nil
})
if err != nil {
log.Error().Err(err).Str("result", "failed").Msg("Failed to scatter sign")
}
log.Trace().Dur("elapsed", time.Since(started)).Msg("Completed signing")
return results, signatures
}
func checkSignData(data *rules.SignData) error {
if data == nil {
return errors.New("request empty")
}
if data.Data == nil {
return errors.New("request missing data")
}
if data.Domain == nil {
return errors.New("request missing domain")
}
return nil
}