GODT-1975: Migrate keychain secrets

internal/legacy/credentials/credentials.go

@@ -0,0 +1,136 @@
+// Copyright (c) 2022 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 credentials implements our struct stored in keychain.
+// Store struct is kind of like a database client.
+// Credentials struct is kind of like one record from the database.
+package credentials
+
+import (
+	"encoding/base64"
+	"errors"
+	"fmt"
+	"strings"
+
+	"github.com/sirupsen/logrus"
+)
+
+const (
+	sep = "\x00"
+
+	itemLengthBridge       = 9
+	itemLengthImportExport = 6 // Old format for Import-Export.
+)
+
+var (
+	log = logrus.WithField("pkg", "credentials") //nolint:gochecknoglobals
+
+	ErrWrongFormat = errors.New("malformed credentials")
+)
+
+type Credentials struct {
+	UserID, // Do not marshal; used as a key.
+	Name,
+	Emails,
+	APIToken string
+	MailboxPassword []byte
+	BridgePassword,
+	Version string
+	Timestamp int64
+	IsHidden, // Deprecated.
+	IsCombinedAddressMode bool
+}
+
+func (s *Credentials) Marshal() string {
+	items := []string{
+		s.Name,                    // 0
+		s.Emails,                  // 1
+		s.APIToken,                // 2
+		string(s.MailboxPassword), // 3
+		s.BridgePassword,          // 4
+		s.Version,                 // 5
+		"",                        // 6
+		"",                        // 7
+		"",                        // 8
+	}
+
+	items[6] = fmt.Sprint(s.Timestamp)
+
+	if s.IsHidden {
+		items[7] = "1"
+	}
+
+	if s.IsCombinedAddressMode {
+		items[8] = "1"
+	}
+
+	str := strings.Join(items, sep)
+	return base64.StdEncoding.EncodeToString([]byte(str))
+}
+
+func (s *Credentials) Unmarshal(secret string) error {
+	b, err := base64.StdEncoding.DecodeString(secret)
+	if err != nil {
+		return err
+	}
+	items := strings.Split(string(b), sep)
+
+	if len(items) != itemLengthBridge && len(items) != itemLengthImportExport {
+		return ErrWrongFormat
+	}
+
+	s.Name = items[0]
+	s.Emails = items[1]
+	s.APIToken = items[2]
+	s.MailboxPassword = []byte(items[3])
+
+	switch len(items) {
+	case itemLengthBridge:
+		s.BridgePassword = items[4]
+		s.Version = items[5]
+		if _, err = fmt.Sscan(items[6], &s.Timestamp); err != nil {
+			s.Timestamp = 0
+		}
+		if s.IsHidden = false; items[7] == "1" {
+			s.IsHidden = true
+		}
+		if s.IsCombinedAddressMode = false; items[8] == "1" {
+			s.IsCombinedAddressMode = true
+		}
+
+	case itemLengthImportExport:
+		s.Version = items[4]
+		if _, err = fmt.Sscan(items[5], &s.Timestamp); err != nil {
+			s.Timestamp = 0
+		}
+	}
+	return nil
+}
+
+func (s *Credentials) EmailList() []string {
+	return strings.Split(s.Emails, ";")
+}
+
+func (s *Credentials) SplitAPIToken() (string, string, error) {
+	split := strings.Split(s.APIToken, ":")
+
+	if len(split) != 2 {
+		return "", "", errors.New("malformed API token")
+	}
+
+	return split[0], split[1], nil
+}