44 lines
1.5 KiB
Go
44 lines
1.5 KiB
Go
// Copyright (c) 2026 Probo Inc <hello@getprobo.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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"fmt"
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"github.com/pdfcpu/pdfcpu/pkg/api"
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"github.com/pdfcpu/pdfcpu/pkg/pdfcpu/types"
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)
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func StampSignatureID(pdfData []byte, signatureID string) ([]byte, error) {
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text := fmt.Sprintf("Electronic Signature ID: %s", signatureID)
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desc := "fontname:Helvetica, points:9, pos:tl, rot:0, op:1.0, scale:1.0 abs, color:0.3 0.3 0.3, offset:10 -10"
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wm, err := api.TextWatermark(text, desc, true, false, types.POINTS)
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if err != nil {
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return nil, fmt.Errorf("cannot create signature ID stamp: %w", err)
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}
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reader := bytes.NewReader(pdfData)
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var buf bytes.Buffer
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if err := api.AddWatermarks(reader, &buf, nil, wm, nil); err != nil {
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return nil, fmt.Errorf("cannot stamp signature ID on PDF: %w", err)
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}
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return buf.Bytes(), nil
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}
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