feat: added additional meta data attributes

lib/append.go

@@ -1,8 +1,11 @@
 package lib
 
 import (
+	"bytes"
 	"errors"
 	"fmt"
+	"os"
+	"path"
 	"path/filepath"
 	"strings"
 
@@ -41,9 +44,17 @@ func AppendToPdf(inputPdfFilePath string, inputXmlFilePath string, outputFilePat
 		),
 	)
 
-	err := api.AddAttachmentsFile(
-		inputPdfFilePath,
-		outputFilePath,
+	inputFile, err := os.Open(inputPdfFilePath)
+	if err != nil {
+		return err
+	}
+	defer inputFile.Close()
+
+	dest := bytes.Buffer{}
+
+	err = api.AddAttachments(
+		inputFile,
+		&dest,
 		[]string{inputXmlFilePath},
 		true,
 		model.NewDefaultConfiguration(),
@@ -52,5 +63,35 @@ func AppendToPdf(inputPdfFilePath string, inputXmlFilePath string, outputFilePat
 		return err
 	}
 
+	source := bytes.NewReader(dest.Bytes())
+	dest = bytes.Buffer{}
+
+	err = api.AddProperties(source, &dest, map[string]string{
+		"DocumentFileName":           path.Base(inputXmlFilePath),
+		"DocumentType":               "INVOICE",
+		"ConformanceLevel":           "EN 16931",
+		"SchemasSchema":              "Factur-X PDFA Extension Schema",
+		"SchemasPrefix":              "fx",
+		"SchemasPropertyName":        "DocumentFileName",
+		"SchemasPropertyValueType":   "Text",
+		"SchemasPropertyCategory":    "external",
+		"SchemasPropertyDescription": "The name of the embedded XML document",
+	}, model.NewDefaultConfiguration())
+	if err != nil {
+		return err
+	}
+
+	var outputFile *os.File
+	outputFile, err = os.Create(outputFilePath)
+	if err != nil {
+		return err
+	}
+	defer outputFile.Close()
+
+	_, err = outputFile.Write(dest.Bytes())
+	if err != nil {
+		return err
+	}
+
 	return nil
 }