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/
evidences.go
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/
evidences.go
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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 main
import (
"bytes"
"context"
"encoding/base64"
"github.com/pkg/errors"
"github.com/stratumn/go-chainscript"
)
// EvidencesTest tests a segment with evidences.
type EvidencesTest struct{}
// NewEvidencesTest creates the test case.
func NewEvidencesTest() TestCase {
return &EvidencesTest{}
}
// Generate encoded segment bytes.
func (t *EvidencesTest) Generate() string {
link, err := chainscript.NewLinkBuilder("test_process", "test_map").
Build()
if err != nil {
panic(err)
}
segment, err := link.Segmentify()
if err != nil {
panic(err)
}
err = segment.AddEvidence(&chainscript.Evidence{
Version: "0.1.0",
Backend: "bitcoin",
Provider: "testnet",
Proof: []byte{42},
})
if err != nil {
panic(err)
}
err = segment.AddEvidence(&chainscript.Evidence{
Version: "1.0.3",
Backend: "ethereum",
Provider: "mainnet",
Proof: []byte{24},
})
if err != nil {
panic(err)
}
b, err := chainscript.MarshalSegment(segment)
if err != nil {
panic(err)
}
return base64.StdEncoding.EncodeToString(b)
}
// Validate encoded segment bytes.
func (t *EvidencesTest) Validate(encoded string) error {
b, err := base64.StdEncoding.DecodeString(encoded)
if err != nil {
return err
}
segment, err := chainscript.UnmarshalSegment(b)
if err != nil {
return err
}
err = segment.Validate(context.Background())
if err != nil {
return err
}
if len(segment.Meta.Evidences) != 2 {
return errors.Errorf("invalid evidences count: %d", len(segment.Meta.Evidences))
}
btc := segment.GetEvidence("bitcoin", "testnet")
if btc == nil {
return errors.Errorf("missing bitcoin evidence")
}
if btc.Version != "0.1.0" || btc.Backend != "bitcoin" || btc.Provider != "testnet" || !bytes.Equal(btc.Proof, []byte{42}) {
return errors.Errorf("invalid bitcoin evidence: %v", btc)
}
eth := segment.GetEvidence("ethereum", "mainnet")
if eth == nil {
return errors.Errorf("missing ethereum evidence")
}
if eth.Version != "1.0.3" || eth.Backend != "ethereum" || eth.Provider != "mainnet" || !bytes.Equal(eth.Proof, []byte{24}) {
return errors.Errorf("invalid ethereum evidence: %v", eth)
}
return nil
}