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sigfilter.go
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sigfilter.go
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/*
Copyright IBM Corp. All Rights Reserved.
SPDX-License-Identifier: Apache-2.0
*/
package msgprocessor
import (
"fmt"
"github.com/hyperledger/fabric/common/policies"
cb "github.com/hyperledger/fabric/protos/common"
"github.com/pkg/errors"
)
// SigFilterSupport provides the resources required for the signature filter
type SigFilterSupport interface {
// PolicyManager returns a reference to the current policy manager
PolicyManager() policies.Manager
}
// SigFilter stores the name of the policy to apply to deliver requests to
// determine whether a client is authorized
type SigFilter struct {
policyName string
support SigFilterSupport
}
// NewSigFilter creates a new signature filter, at every evaluation, the policy manager is called
// to retrieve the latest version of the policy
func NewSigFilter(policyName string, support SigFilterSupport) *SigFilter {
return &SigFilter{
policyName: policyName,
support: support,
}
}
// Apply applies the policy given, resulting in Reject or Forward, never Accept
func (sf *SigFilter) Apply(message *cb.Envelope) error {
signedData, err := message.AsSignedData()
if err != nil {
return fmt.Errorf("could not convert message to signedData: %s", err)
}
policy, ok := sf.support.PolicyManager().GetPolicy(sf.policyName)
if !ok {
return fmt.Errorf("could not find policy %s", sf.policyName)
}
err = policy.Evaluate(signedData)
if err != nil {
return errors.Wrap(errors.WithStack(ErrPermissionDenied), err.Error())
}
return nil
}