76 lines
2.2 KiB
Go
76 lines
2.2 KiB
Go
// Copyright (c) 2020 Proton Technologies AG
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//
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// This file is part of ProtonMail Bridge.
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//
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// ProtonMail Bridge is free software: you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// ProtonMail Bridge is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with ProtonMail Bridge. If not, see <https://www.gnu.org/licenses/>.
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package message
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import (
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"encoding/base64"
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"fmt"
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"io"
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"mime/quotedprintable"
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"github.com/ProtonMail/gopenpgp/v2/crypto"
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"github.com/ProtonMail/proton-bridge/pkg/pmapi"
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"github.com/emersion/go-textwrapper"
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openpgperrors "golang.org/x/crypto/openpgp/errors"
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)
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func WriteBody(w io.Writer, kr *crypto.KeyRing, m *pmapi.Message) error {
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// Decrypt body.
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if err := m.Decrypt(kr); err != nil && err != openpgperrors.ErrSignatureExpired {
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return err
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}
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if m.MIMEType != pmapi.ContentTypeMultipartMixed {
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// Encode it.
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qp := quotedprintable.NewWriter(w)
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if _, err := io.WriteString(qp, m.Body); err != nil {
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return err
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}
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return qp.Close()
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}
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_, err := io.WriteString(w, m.Body)
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return err
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}
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func WriteAttachmentBody(w io.Writer, kr *crypto.KeyRing, m *pmapi.Message, att *pmapi.Attachment, r io.Reader) (err error) {
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// Decrypt it
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var dr io.Reader
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dr, err = att.Decrypt(r, kr)
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if err == openpgperrors.ErrKeyIncorrect {
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// Do not fail if attachment is encrypted with a different key.
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dr = r
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err = nil
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att.Name += ".gpg"
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att.MIMEType = "application/pgp-encrypted" //nolint
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} else if err != nil && err != openpgperrors.ErrSignatureExpired {
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err = fmt.Errorf("cannot decrypt attachment: %v", err)
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return
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}
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// Encode it.
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ww := textwrapper.NewRFC822(w)
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bw := base64.NewEncoder(base64.StdEncoding, ww)
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var n int64
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if n, err = io.Copy(bw, dr); err != nil {
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err = fmt.Errorf("cannot write attachment: %v (wrote %v bytes)", err, n)
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}
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_ = bw.Close()
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return
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}
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