Other(refactor): Move client config to bridge

internal/clientconfig/applemail.go

@@ -0,0 +1,117 @@
+// 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 clientconfig
+
+import (
+	"io/ioutil"
+	"os"
+	"path/filepath"
+	"strconv"
+	"time"
+
+	"github.com/ProtonMail/proton-bridge/v2/internal/config/useragent"
+	"github.com/ProtonMail/proton-bridge/v2/pkg/mobileconfig"
+	"golang.org/x/sys/execabs"
+)
+
+const (
+	bigSurPreferencesPane  = "/System/Library/PreferencePanes/Profiles.prefPane"
+	venturaPreferencesPane = "x-apple.systempreferences:com.apple.preferences.configurationprofiles"
+)
+
+type AppleMail struct{}
+
+func (c *AppleMail) Configure(
+	hostname string,
+	imapPort, smtpPort int,
+	imapSSL, smtpSSL bool,
+	username, addresses, password string,
+) error {
+	mc := prepareMobileConfig(hostname, imapPort, smtpPort, imapSSL, smtpSSL, username, addresses, password)
+
+	confPath, err := saveConfigTemporarily(mc)
+	if err != nil {
+		return err
+	}
+
+	if useragent.IsBigSurOrNewer() {
+		prefPane := bigSurPreferencesPane
+
+		if useragent.IsVenturaOrNewer() {
+			prefPane = venturaPreferencesPane
+		}
+
+		return execabs.Command("open", prefPane, confPath).Run() //nolint:gosec // G204 open command is safe, mobileconfig is generated by us
+	}
+
+	return execabs.Command("open", confPath).Run() //nolint:gosec // G204 open command is safe, mobileconfig is generated by us
+}
+
+func prepareMobileConfig(
+	hostname string,
+	imapPort, smtpPort int,
+	imapSSL, smtpSSL bool,
+	username, addresses, password string,
+) *mobileconfig.Config {
+	return &mobileconfig.Config{
+		DisplayName:  username,
+		EmailAddress: addresses,
+		Identifier:   "protonmail " + username + strconv.FormatInt(time.Now().Unix(), 10),
+		IMAP: &mobileconfig.IMAP{
+			Hostname: hostname,
+			Port:     imapPort,
+			TLS:      imapSSL,
+			Username: username,
+			Password: password,
+		},
+		SMTP: &mobileconfig.SMTP{
+			Hostname: hostname,
+			Port:     smtpPort,
+			TLS:      smtpSSL,
+			Username: username,
+		},
+	}
+}
+
+func saveConfigTemporarily(mc *mobileconfig.Config) (fname string, err error) {
+	dir, err := ioutil.TempDir("", "protonmail-autoconfig")
+	if err != nil {
+		return
+	}
+
+	// Make sure the temporary file is deleted.
+	go func() {
+		<-time.After(10 * time.Minute)
+		_ = os.RemoveAll(dir)
+	}()
+
+	// Make sure the file is only readable for the current user.
+	fname = filepath.Clean(filepath.Join(dir, "protonmail.mobileconfig"))
+	f, err := os.OpenFile(fname, os.O_RDWR|os.O_CREATE, 0o600) //nolint:gosec
+	if err != nil {
+		return
+	}
+
+	if err = mc.WriteOut(f); err != nil {
+		_ = f.Close()
+		return
+	}
+	_ = f.Close()
+
+	return
+}