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timestamping.go
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timestamping.go
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// Copyright 2024 The Sigstore Authors.
//
// 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 sign
import (
"bytes"
"context"
"crypto"
"crypto/sha256"
"fmt"
"io"
"math"
"net/http"
"time"
"github.com/digitorus/timestamp"
"github.com/sigstore/sigstore-go/pkg/util"
)
type TimestampAuthorityOptions struct {
// Full URL (with path) of Timestamp Authority endpoint
URL string
// Optional timeout for network requests (default 30s; use negative value for no timeout)
Timeout time.Duration
// Optional number of times to retry on HTTP 5XX
Retries uint
// Optional Transport (for dependency injection)
Transport http.RoundTripper
}
type TimestampAuthority struct {
options *TimestampAuthorityOptions
client *http.Client
}
func NewTimestampAuthority(opts *TimestampAuthorityOptions) *TimestampAuthority {
ta := &TimestampAuthority{options: opts}
ta.client = &http.Client{
Transport: opts.Transport,
}
if opts.Timeout >= 0 {
if opts.Timeout == 0 {
opts.Timeout = 30 * time.Second
}
ta.client.Timeout = opts.Timeout
}
return ta
}
func (ta *TimestampAuthority) GetTimestamp(ctx context.Context, signature []byte) ([]byte, error) {
signatureHash := sha256.Sum256(signature)
req := ×tamp.Request{
HashAlgorithm: crypto.SHA256,
HashedMessage: signatureHash[:],
}
reqBytes, err := req.Marshal()
if err != nil {
return nil, err
}
attempts := uint(0)
var response *http.Response
for attempts <= ta.options.Retries {
request, err := http.NewRequest("POST", ta.options.URL, bytes.NewReader(reqBytes))
if err != nil {
return nil, err
}
request.Header.Add("Content-Type", "application/timestamp-query")
request.Header.Add("User-Agent", util.ConstructUserAgent())
response, err = ta.client.Do(request)
if err != nil {
return nil, err
}
if !((response.StatusCode >= 500 && response.StatusCode < 600) || response.StatusCode == 429) {
// Not a retryable HTTP status code, so don't retry
break
}
delay := time.Duration(math.Pow(2, float64(attempts)))
timer := time.NewTimer(delay * time.Second)
select {
case <-ctx.Done():
timer.Stop()
return nil, ctx.Err()
case <-timer.C:
}
attempts++
}
body, err := io.ReadAll(response.Body)
if err != nil {
return nil, err
}
if response.StatusCode != 200 && response.StatusCode != 201 {
return nil, fmt.Errorf("Timestamp authority returned %d: %s", response.StatusCode, string(body))
}
_, err = timestamp.ParseResponse(body)
if err != nil {
return nil, err
}
return body, nil
}