This is the v1 version, had the v2 before.

backend/memory/message.go

@@ -0,0 +1,74 @@
+package memory
+
+import (
+	"bufio"
+	"bytes"
+	"io"
+	"time"
+
+	"github.com/emersion/go-imap"
+	"github.com/emersion/go-imap/backend/backendutil"
+	"github.com/emersion/go-message"
+	"github.com/emersion/go-message/textproto"
+)
+
+type Message struct {
+	Uid   uint32
+	Date  time.Time
+	Size  uint32
+	Flags []string
+	Body  []byte
+}
+
+func (m *Message) entity() (*message.Entity, error) {
+	return message.Read(bytes.NewReader(m.Body))
+}
+
+func (m *Message) headerAndBody() (textproto.Header, io.Reader, error) {
+	body := bufio.NewReader(bytes.NewReader(m.Body))
+	hdr, err := textproto.ReadHeader(body)
+	return hdr, body, err
+}
+
+func (m *Message) Fetch(seqNum uint32, items []imap.FetchItem) (*imap.Message, error) {
+	fetched := imap.NewMessage(seqNum, items)
+	for _, item := range items {
+		switch item {
+		case imap.FetchEnvelope:
+			hdr, _, _ := m.headerAndBody()
+			fetched.Envelope, _ = backendutil.FetchEnvelope(hdr)
+		case imap.FetchBody, imap.FetchBodyStructure:
+			hdr, body, _ := m.headerAndBody()
+			fetched.BodyStructure, _ = backendutil.FetchBodyStructure(hdr, body, item == imap.FetchBodyStructure)
+		case imap.FetchFlags:
+			fetched.Flags = m.Flags
+		case imap.FetchInternalDate:
+			fetched.InternalDate = m.Date
+		case imap.FetchRFC822Size:
+			fetched.Size = m.Size
+		case imap.FetchUid:
+			fetched.Uid = m.Uid
+		default:
+			section, err := imap.ParseBodySectionName(item)
+			if err != nil {
+				break
+			}
+
+			body := bufio.NewReader(bytes.NewReader(m.Body))
+			hdr, err := textproto.ReadHeader(body)
+			if err != nil {
+				return nil, err
+			}
+
+			l, _ := backendutil.FetchBodySection(hdr, body, section)
+			fetched.Body[section] = l
+		}
+	}
+
+	return fetched, nil
+}
+
+func (m *Message) Match(seqNum uint32, c *imap.SearchCriteria) (bool, error) {
+	e, _ := m.entity()
+	return backendutil.Match(e, seqNum, m.Uid, m.Date, m.Flags, c)
+}