George Lambert
46f2bcd43e
Implements macOS v0: verae-print stamp + install-macos PDF menu items.
Saves {name}.pdf, {name}-verae-timestamp-{RECEIPTID}.pdf, and .verae.json.
Channels: verae (api.veraetime.net JWT) and zapier (zap.verae.ai xVerae- + attachPdf).
103 lines
2.8 KiB
Go
103 lines
2.8 KiB
Go
package pdfcert
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import (
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"fmt"
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"strings"
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"time"
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)
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// Input for a simple one-page Verae registration certificate PDF.
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type Input struct {
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DocumentName string
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SHA256 string
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ReceiptID string
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CreatedAt string
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Merkle string
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VerifyURL string
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Channel string
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}
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// Build returns a minimal PDF (no external deps) describing the stamp.
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func Build(in Input) ([]byte, error) {
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created := in.CreatedAt
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if created == "" {
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created = time.Now().UTC().Format(time.RFC3339)
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}
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local := ""
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if t, err := time.Parse(time.RFC3339, created); err == nil {
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local = t.Local().Format(time.RFC1123)
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}
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verify := in.VerifyURL
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if verify == "" && in.SHA256 != "" {
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verify = fmt.Sprintf("https://mcp.verae.ai/register.html?sha256=%s&receipt=%s", in.SHA256, in.ReceiptID)
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}
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lines := []string{
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"Verae Timestamp Registration",
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"",
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"Document: " + sanitize(in.DocumentName),
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"SHA-256: " + in.SHA256,
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"Receipt ID: " + in.ReceiptID,
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"UTC: " + created,
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}
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if local != "" {
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lines = append(lines, "Local: "+local)
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}
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if in.Merkle != "" {
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lines = append(lines, "Merkle/block: "+in.Merkle)
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}
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if in.Channel != "" {
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lines = append(lines, "Channel: "+in.Channel)
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}
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lines = append(lines, "Verify: "+verify)
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lines = append(lines, "", "Digests only — document bytes were not uploaded.")
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return buildTextPDF(lines)
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}
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func sanitize(s string) string {
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s = strings.ReplaceAll(s, "(", "\\(")
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s = strings.ReplaceAll(s, ")", "\\)")
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s = strings.ReplaceAll(s, "\\", "\\\\")
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return s
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}
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// Minimal PDF 1.4 with Helvetica text lines.
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func buildTextPDF(lines []string) ([]byte, error) {
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var content strings.Builder
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content.WriteString("BT /F1 12 Tf 50 750 Td 14 TL\n")
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for i, line := range lines {
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if i > 0 {
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content.WriteString("T*\n")
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}
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content.WriteString("(")
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content.WriteString(sanitize(line))
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content.WriteString(") Tj\n")
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}
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content.WriteString("ET\n")
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stream := content.String()
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objects := []string{
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"<< /Type /Catalog /Pages 2 0 R >>",
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"<< /Type /Pages /Kids [3 0 R] /Count 1 >>",
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"<< /Type /Page /Parent 2 0 R /MediaBox [0 0 612 792] /Contents 4 0 R /Resources << /Font << /F1 5 0 R >> >> >>",
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fmt.Sprintf("<< /Length %d >>\nstream\n%s\nendstream", len(stream), stream),
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"<< /Type /Font /Subtype /Type1 /BaseFont /Helvetica >>",
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}
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var body strings.Builder
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body.WriteString("%PDF-1.4\n")
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offsets := make([]int, len(objects)+1)
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for i, obj := range objects {
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offsets[i+1] = body.Len()
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fmt.Fprintf(&body, "%d 0 obj\n%s\nendobj\n", i+1, obj)
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}
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xrefStart := body.Len()
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fmt.Fprintf(&body, "xref\n0 %d\n", len(objects)+1)
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body.WriteString("0000000000 65535 f \n")
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for i := 1; i <= len(objects); i++ {
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fmt.Fprintf(&body, "%010d 00000 n \n", offsets[i])
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}
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fmt.Fprintf(&body, "trailer << /Size %d /Root 1 0 R >>\nstartxref\n%d\n%%%%EOF\n", len(objects)+1, xrefStart)
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return []byte(body.String()), nil
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}
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