86 lines
2.7 KiB
Go
86 lines
2.7 KiB
Go
// Copyright (c) 2026 Probo Inc <hello@probo.com>.
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//
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// Permission to use, copy, modify, and/or distribute this software for any
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// purpose with or without fee is hereby granted, provided that the above
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// copyright notice and this permission notice appear in all copies.
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//
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// THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES WITH
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// REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
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// AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT,
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// INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
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// LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR
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// OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
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// PERFORMANCE OF THIS SOFTWARE.
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package esign
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import (
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"bytes"
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"context"
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"crypto"
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"fmt"
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"io"
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"net/http"
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"github.com/digitorus/timestamp"
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"go.gearno.de/kit/httpclient"
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)
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// TSAClient sends RFC 3161 timestamp requests to a Trusted Timestamp Authority.
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type TSAClient struct {
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URL string
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HTTPClient *http.Client
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}
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// Timestamp sends an RFC 3161 TimeStampReq via HTTP POST to the TSA.
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// The data parameter is the raw bytes to timestamp (typically the seal hex
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// string as UTF-8 bytes). CreateRequest internally computes SHA-256(data)
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// to build the MessageImprint. Returns the raw DER-encoded TimeStampResp bytes.
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func (c *TSAClient) Timestamp(ctx context.Context, data []byte) ([]byte, error) {
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tsReq, err := timestamp.CreateRequest(
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bytes.NewReader(data),
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×tamp.RequestOptions{
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Hash: crypto.SHA256,
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Certificates: true,
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},
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)
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if err != nil {
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return nil, fmt.Errorf("esign: cannot create timestamp request: %w", err)
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}
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httpClient := c.HTTPClient
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if httpClient == nil {
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httpClient = httpclient.DefaultPooledClient()
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}
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req, err := http.NewRequestWithContext(ctx, http.MethodPost, c.URL, bytes.NewReader(tsReq))
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if err != nil {
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return nil, fmt.Errorf("esign: cannot build TSA HTTP request: %w", err)
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}
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req.Header.Set("Content-Type", "application/timestamp-query")
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resp, err := httpClient.Do(req)
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if err != nil {
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return nil, fmt.Errorf("esign: TSA request failed: %w", err)
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}
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defer func() { _ = resp.Body.Close() }()
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if resp.StatusCode != http.StatusOK {
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return nil, fmt.Errorf("esign: TSA returned HTTP %d", resp.StatusCode)
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}
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respBytes, err := io.ReadAll(resp.Body)
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if err != nil {
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return nil, fmt.Errorf("esign: cannot read TSA response: %w", err)
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}
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// Validate the response: checks PKIStatus and parses the signed TSTInfo.
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if _, err := timestamp.ParseResponse(respBytes); err != nil {
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return nil, fmt.Errorf("esign: invalid TSA response: %w", err)
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}
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return respBytes, nil
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}
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