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provenance.go
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provenance.go
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// Copyright 2023 Google LLC 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 internal
import (
"crypto/sha256"
"encoding/hex"
"encoding/json"
"fmt"
"os"
)
type Provenance struct {
Uri string
Digest string
}
func GenerateProvenance(provenancePath string, packageFileName string, uri string) error {
digest, err := computeDigest(packageFileName)
if err != nil {
return fmt.Errorf("error computing digest for %s: %w", packageFileName, err)
}
fmt.Printf("digest: %s uri: %s", digest, uri)
provenance := &Provenance{
Uri: uri,
Digest: digest,
}
file, err := json.Marshal(provenance)
fmt.Printf("provenance: %s", string(file[:]))
if err != nil {
return fmt.Errorf("error marshaling json %v: %w", provenance, err)
}
// Write provenance as json file in path
err = os.WriteFile(provenancePath, file, 0444)
if err != nil {
return fmt.Errorf("error writing file into %s: %w", provenancePath, err)
}
return nil
}
func computeDigest(filePath string) (string, error) {
data, err := os.ReadFile(filePath)
if err != nil {
return "", fmt.Errorf("error reading %s: %w", filePath, err)
}
if len(data) == 0 {
return "", fmt.Errorf("empty file: %s", filePath)
}
hash := sha256.Sum256(data)
return hex.EncodeToString(hash[:]), nil
}