feat(GODT-2802): IMAP Serivce

Handles all IMAP related tasks. Unlike the previous iteration, this new
service automatically adds and removes users from Gluon by interfacing
with server manager.

internal/services/imapservice/sync_build_test.go

@@ -0,0 +1,80 @@
+// Copyright (c) 2023 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 imapservice
+
+import (
+	"errors"
+	"testing"
+	"time"
+
+	"github.com/ProtonMail/gluon/imap"
+	"github.com/ProtonMail/gluon/rfc822"
+	"github.com/ProtonMail/go-proton-api"
+	"github.com/bradenaw/juniper/xslices"
+	"github.com/stretchr/testify/require"
+)
+
+func TestNewFailedMessageLiteral(t *testing.T) {
+	literal := newFailedMessageLiteral("abcd-efgh", time.Unix(123456789, 0), "subject", errors.New("oops"))
+
+	header, err := rfc822.Parse(literal).ParseHeader()
+	require.NoError(t, err)
+	require.Equal(t, "Message failed to build", header.Get("Subject"))
+	require.Equal(t, "29 Nov 73 21:33 UTC", header.Get("Date"))
+	require.Equal(t, "text/plain", header.Get("Content-Type"))
+	require.Equal(t, "base64", header.Get("Content-Transfer-Encoding"))
+
+	b, err := rfc822.Parse(literal).DecodedBody()
+	require.NoError(t, err)
+	require.Equal(t, string(b), "Failed to build message: \nSubject:   subject\nError:     oops\nMessageID: abcd-efgh\n")
+
+	parsed, err := imap.NewParsedMessage(literal)
+	require.NoError(t, err)
+	require.Equal(t, `("29 Nov 73 21:33 UTC" "Message failed to build" NIL NIL NIL NIL NIL NIL NIL NIL)`, parsed.Envelope)
+	require.Equal(t, `("text" "plain" () NIL NIL "base64" 114 2)`, parsed.Body)
+	require.Equal(t, `("text" "plain" () NIL NIL "base64" 114 2 NIL NIL NIL NIL)`, parsed.Structure)
+}
+
+func TestSyncChunkSyncBuilderBatch(t *testing.T) {
+	// GODT-2424 - Some messages were not fully built due to a bug in the chunking if the total memory used by the
+	// message would be higher than the maximum we allowed.
+	const totalMessageCount = 100
+
+	msg := proton.FullMessage{
+		Message: proton.Message{
+			Attachments: []proton.Attachment{
+				{
+					Size: int64(8 * Megabyte),
+				},
+			},
+		},
+		AttData: nil,
+	}
+
+	messages := xslices.Repeat(msg, totalMessageCount)
+
+	chunks := chunkSyncBuilderBatch(messages, 16*Megabyte)
+
+	var totalMessagesInChunks int
+
+	for _, v := range chunks {
+		totalMessagesInChunks += len(v)
+	}
+
+	require.Equal(t, totalMessagesInChunks, totalMessageCount)
+}