peroxide: Move sanitizers to a separate file

pkg/message/encrypt.go

@@ -18,7 +18,6 @@
 package message
 
 import (
-	"bufio"
 	"bytes"
 	"encoding/base64"
 	"io"
@@ -215,83 +214,17 @@ func writeEncryptedMultiPart(kr *crypto.KeyRing, w io.Writer, header *textproto.
 	return writer.done()
 }
 
-type Base64Cleaner struct {
-	r io.Reader
-}
-
-func NewBase64Cleaner(r io.Reader) (*Base64Cleaner, error) {
-	reader := bufio.NewReader(r)
-	var data []byte
-
-	for {
-		line, err := reader.ReadBytes('\n')
-
-		if len(line) != 0 {
-			line = bytes.TrimSpace(line)
-			line = bytes.TrimSuffix(line, []byte("!"))
-			data = append(data, line...)
-		}
-
-		if err != nil {
-			if errors.Is(err, io.EOF) {
-				break
-			}
-			return nil, err
-		}
-	}
-
-	return &Base64Cleaner{bytes.NewReader(data)}, nil
-}
-
-func (c *Base64Cleaner) Read(b []byte) (int, error) {
-	return c.r.Read(b)
-}
-
-type QuotedPrintableCleaner struct {
-	r io.Reader
-}
-
-func NewQuotedPrintableCleaner(r io.Reader) (*QuotedPrintableCleaner, error) {
-	reader := bufio.NewReader(r)
-	var data []byte
-
-	for {
-		line, err := reader.ReadBytes('\n')
-
-		if len(line) != 0 {
-			if len(line) == 1 && line[0] == '=' {
-				continue
-			}
-
-			data = append(data, line...)
-		}
-
-		if err != nil {
-			if errors.Is(err, io.EOF) {
-				break
-			}
-			return nil, err
-		}
-	}
-
-	return &QuotedPrintableCleaner{bytes.NewReader(data)}, nil
-}
-
-func (c *QuotedPrintableCleaner) Read(b []byte) (int, error) {
-	return c.r.Read(b)
-}
-
 func getTransferDecoder(r io.Reader, encoding string) (io.Reader, error) {
 	switch strings.ToLower(encoding) {
 	case "base64":
-		cleaner, err := NewBase64Cleaner(r)
+		cleaner, err := NewBase64Sanitizer(r)
 		if err != nil {
 			return nil, err
 		}
 		return base64.NewDecoder(base64.StdEncoding, cleaner), nil
 
 	case "quoted-printable":
-		cleaner, err := NewQuotedPrintableCleaner(r)
+		cleaner, err := NewQuotedPrintableSanitizer(r)
 		if err != nil {
 			return nil, err
 		}

pkg/message/sanitizers.go

@@ -0,0 +1,92 @@
+// Copyright (c) 2022 Lukasz Janyst <lukasz@jany.st>
+//
+// This file is part of Peroxide.
+//
+// Peroxide 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.
+//
+// Peroxide 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 Peroxide.  If not, see <https://www.gnu.org/licenses/>.
+
+package message
+
+import (
+	"bufio"
+	"bytes"
+	"io"
+
+	"github.com/pkg/errors"
+)
+
+type Base64Sanitizer struct {
+	r io.Reader
+}
+
+func NewBase64Sanitizer(r io.Reader) (*Base64Sanitizer, error) {
+	reader := bufio.NewReader(r)
+	var data []byte
+
+	for {
+		line, err := reader.ReadBytes('\n')
+
+		if len(line) != 0 {
+			line = bytes.TrimSpace(line)
+			line = bytes.TrimSuffix(line, []byte("!"))
+			data = append(data, line...)
+		}
+
+		if err != nil {
+			if errors.Is(err, io.EOF) {
+				break
+			}
+			return nil, err
+		}
+	}
+
+	return &Base64Sanitizer{bytes.NewReader(data)}, nil
+}
+
+func (c *Base64Sanitizer) Read(b []byte) (int, error) {
+	return c.r.Read(b)
+}
+
+type QuotedPrintableSanitizer struct {
+	r io.Reader
+}
+
+func NewQuotedPrintableSanitizer(r io.Reader) (*QuotedPrintableSanitizer, error) {
+	reader := bufio.NewReader(r)
+	var data []byte
+
+	for {
+		line, err := reader.ReadBytes('\n')
+
+		if len(line) != 0 {
+			if len(line) == 1 && line[0] == '=' {
+				continue
+			}
+
+			data = append(data, line...)
+		}
+
+		if err != nil {
+			if errors.Is(err, io.EOF) {
+				break
+			}
+			return nil, err
+		}
+	}
+
+	return &QuotedPrintableSanitizer{bytes.NewReader(data)}, nil
+}
+
+func (c *QuotedPrintableSanitizer) Read(b []byte) (int, error) {
+	return c.r.Read(b)
+}