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writer.go
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writer.go
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// Copyright (c) 2023 Proton AG
//
// This file is part of Proton Mail Bridge.
//
// Proton Mail Bridge is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// Proton Mail Bridge is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with Proton Mail Bridge. If not, see <https://www.gnu.org/licenses/>.
package parser
import (
"io"
"github.com/emersion/go-message"
)
type Writer struct {
root *Part
}
func newWriter(root *Part) *Writer {
return &Writer{
root: root,
}
}
func (w *Writer) Write(ww io.Writer) error {
if !w.root.is7BitClean() {
w.root.Header.Set("Content-Transfer-Encoding", "base64")
}
msgWriter, err := message.CreateWriter(ww, w.root.Header)
if err != nil {
return err
}
if err := w.write(msgWriter, w.root); err != nil {
return err
}
return msgWriter.Close()
}
func (w *Writer) write(writer *message.Writer, p *Part) error {
if len(p.children) > 0 {
for _, child := range p.children {
if err := w.writeAsChild(writer, child); err != nil {
return err
}
}
}
if _, err := writer.Write(p.Body); err != nil {
return err
}
return nil
}
func (w *Writer) writeAsChild(writer *message.Writer, p *Part) error {
if !p.is7BitClean() {
p.Header.Set("Content-Transfer-Encoding", "base64")
}
childWriter, err := writer.CreatePart(p.Header)
if err != nil {
return err
}
if err := w.write(childWriter, p); err != nil {
return err
}
return childWriter.Close()
}