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policy.go
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policy.go
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/*
Copyright IBM Corp. All Rights Reserved.
SPDX-License-Identifier: Apache-2.0
*/
package cauthdsl
import (
"errors"
"fmt"
"github.com/hyperledger/fabric/common/policies"
cb "github.com/hyperledger/fabric/protos/common"
"github.com/golang/protobuf/proto"
"github.com/hyperledger/fabric/msp"
)
type provider struct {
deserializer msp.IdentityDeserializer
}
// NewProviderImpl provides a policy generator for cauthdsl type policies
func NewPolicyProvider(deserializer msp.IdentityDeserializer) policies.Provider {
return &provider{
deserializer: deserializer,
}
}
// NewPolicy creates a new policy based on the policy bytes
func (pr *provider) NewPolicy(data []byte) (policies.Policy, proto.Message, error) {
sigPolicy := &cb.SignaturePolicyEnvelope{}
if err := proto.Unmarshal(data, sigPolicy); err != nil {
return nil, nil, fmt.Errorf("Error unmarshaling to SignaturePolicy: %s", err)
}
if sigPolicy.Version != 0 {
return nil, nil, fmt.Errorf("This evaluator only understands messages of version 0, but version was %d", sigPolicy.Version)
}
compiled, err := compile(sigPolicy.Rule, sigPolicy.Identities, pr.deserializer)
if err != nil {
return nil, nil, err
}
return &policy{
evaluator: compiled,
}, sigPolicy, nil
}
type policy struct {
evaluator func([]*cb.SignedData, []bool) bool
}
// Evaluate takes a set of SignedData and evaluates whether this set of signatures satisfies the policy
func (p *policy) Evaluate(signatureSet []*cb.SignedData) error {
if p == nil {
return fmt.Errorf("No such policy")
}
ok := p.evaluator(deduplicate(signatureSet), make([]bool, len(signatureSet)))
if !ok {
return errors.New("Failed to authenticate policy")
}
return nil
}