refactor: don't reconstruct mimeBody

pkg/message/parser/parser.go

@@ -1,11 +1,28 @@
+// Copyright (c) 2020 Proton Technologies AG
+//
+// This file is part of ProtonMail Bridge.
+//
+// ProtonMail 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.
+//
+// ProtonMail 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 ProtonMail Bridge.  If not, see <https://www.gnu.org/licenses/>.
+
 package parser
 
 import (
+	"bytes"
 	"io"
 	"io/ioutil"
 
 	"github.com/emersion/go-message"
-	"github.com/sirupsen/logrus"
 )
 
 type Parser struct {
@@ -13,10 +30,10 @@ type Parser struct {
 	root  *Part
 }
 
-func New(r io.Reader) (*Parser, error) {
+func New(b []byte) (*Parser, error) {
 	p := new(Parser)
 
-	entity, err := message.Read(r)
+	entity, err := message.Read(bytes.NewReader(b))
 	if err != nil && !message.IsUnknownCharset(err) {
 		return nil, err
 	}
@@ -70,12 +87,6 @@ func (p *Parser) endPart() {
 	} else {
 		p.root = part
 	}
-
-	if !part.isUTF8() {
-		if err := part.convertToUTF8(); err != nil {
-			logrus.WithError(err).Error("failed to convert part to utf-8")
-		}
-	}
 }
 
 func (p *Parser) top() *Part {