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// Copyright 2017-2018 Stratumn SAS. All rights reserved.
//
// 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 chainscript
// NewEvidence creates a new evidence that can be added to a segment.
func NewEvidence(version, backend, provider string, proofData []byte) (*Evidence, error) {
e := &Evidence{
Version: version,
Backend: backend,
Provider: provider,
Proof: proofData,
}
err := e.Validate()
if err != nil {
return nil, err
}
return e, nil
}
// Validate that the evidence is well-formed.
// The proof is opaque bytes so it isn't validated here.
func (e *Evidence) Validate() error {
if len(e.Version) == 0 {
return ErrMissingVersion
}
if len(e.Backend) == 0 {
return ErrMissingBackend
}
if len(e.Provider) == 0 {
return ErrMissingProvider
}
if len(e.Proof) == 0 {
return ErrMissingProof
}
return nil
}
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