51 lines
1.3 KiB
Go
51 lines
1.3 KiB
Go
package sign
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import (
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"errors"
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"strconv"
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)
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func (context *SignContext) createVisualSignature() (visual_signature string, err error) {
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visual_signature = strconv.Itoa(int(context.VisualSignData.ObjectId)) + " 0 obj\n"
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visual_signature += "<< /Type /Annot"
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visual_signature += " /Subtype /Widget"
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visual_signature += " /Rect [0 0 0 0]"
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root := context.PDFReader.Trailer().Key("Root")
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root_keys := root.Keys()
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found_pages := false
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for _, key := range root_keys {
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if key == "Pages" {
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found_pages = true
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break
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}
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}
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if !found_pages {
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return "", errors.New("Didn't find pages in PDF trailer Root.")
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}
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rootPtr := root.GetPtr()
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context.CatalogData.RootString = strconv.Itoa(int(rootPtr.GetID())) + " " + strconv.Itoa(int(rootPtr.GetGen())) + " R"
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first_page, err := findFirstPage(root.Key("Pages"))
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if err != nil {
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return "", err
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}
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first_page_ptr := first_page.GetPtr()
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visual_signature += " /P " + strconv.Itoa(int(first_page_ptr.GetID())) + " " + strconv.Itoa(int(first_page_ptr.GetGen())) + " R"
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visual_signature += " /F 132"
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visual_signature += " /FT /Sig"
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visual_signature += " /T " + pdfString("Signature")
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visual_signature += " /Ff 0"
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visual_signature += " /V " + strconv.Itoa(int(context.SignData.ObjectId)) + " 0 R"
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visual_signature += " >>"
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visual_signature += "\nendobj\n"
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return visual_signature, nil
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}
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