imap: ListMessages: handle body viewing, etc

internal/store/maildir.go

@@ -2,6 +2,7 @@ package store
 
 import (
 	"errors"
+	"io"
 	"net/mail"
 	"os"
 	"path/filepath"
@@ -50,6 +51,15 @@ func (m *Maildir) NextUID() uint64 {
 	return m.uids.NextUID()
 }
 
+func (m *Maildir) MessageData(message Message) (io.ReadCloser, error) {
+	filename, err := m.filesystem.Filename(message.Key)
+	if err != nil {
+		return nil, err
+	}
+
+	return os.Open(filename)
+}
+
 func (c *concrete) CreateMaildir(m *Maildir) error {
 	if m.directory == "" {
 		m.directory = c.buildMaildirPath(m.Account, m.Name)

internal/store/message.go

@@ -9,12 +9,18 @@ import (
 	"strings"
 )
 
+type MessageInterface interface {
+	CreateMessage(Message) error
+}
+
 type Message struct {
 	Maildir Maildir // maildir.name
 
-	UID      uint64
-	SeqNum   uint64
-	Key      string
+	UID    uint64
+	SeqNum uint64
+	Key    string
+
+	// Data is usually nil, but may be an io.ReadCloser if SetupData is called
 	Data     io.ReadCloser
 	hdrCache mail.Header
 }
@@ -54,10 +60,6 @@ func (m *Message) HeaderString() (string, error) {
 	return sb.String(), nil // FIXME
 }
 
-type MessageInterface interface {
-	CreateMessage(Message) error
-}
-
 // DeliverMessage takes the given message and delivers it to the correct maildir
 // It does not call Close() on message.Data
 func (c *concrete) CreateMessage(message Message) error {