Forked the emersion/go-imap v1 project.

imapserver/select.go

@@ -0,0 +1,160 @@
+package imapserver
+
+import (
+	"fmt"
+
+	"github.com/emersion/go-imap/v2"
+	"github.com/emersion/go-imap/v2/internal/imapwire"
+)
+
+func (c *Conn) handleSelect(tag string, dec *imapwire.Decoder, readOnly bool) error {
+	var mailbox string
+	if !dec.ExpectSP() || !dec.ExpectMailbox(&mailbox) || !dec.ExpectCRLF() {
+		return dec.Err()
+	}
+
+	if err := c.checkState(imap.ConnStateAuthenticated); err != nil {
+		return err
+	}
+
+	if c.state == imap.ConnStateSelected {
+		if err := c.session.Unselect(); err != nil {
+			return err
+		}
+		c.state = imap.ConnStateAuthenticated
+		err := c.writeStatusResp("", &imap.StatusResponse{
+			Type: imap.StatusResponseTypeOK,
+			Code: "CLOSED",
+			Text: "Previous mailbox is now closed",
+		})
+		if err != nil {
+			return err
+		}
+	}
+
+	options := imap.SelectOptions{ReadOnly: readOnly}
+	data, err := c.session.Select(mailbox, &options)
+	if err != nil {
+		return err
+	}
+
+	if err := c.writeExists(data.NumMessages); err != nil {
+		return err
+	}
+	if !c.enabled.Has(imap.CapIMAP4rev2) {
+		if err := c.writeObsoleteRecent(data.NumRecent); err != nil {
+			return err
+		}
+	}
+	if err := c.writeUIDValidity(data.UIDValidity); err != nil {
+		return err
+	}
+	if err := c.writeUIDNext(data.UIDNext); err != nil {
+		return err
+	}
+	if err := c.writeFlags(data.Flags); err != nil {
+		return err
+	}
+	if err := c.writePermanentFlags(data.PermanentFlags); err != nil {
+		return err
+	}
+	if data.List != nil {
+		if err := c.writeList(data.List); err != nil {
+			return err
+		}
+	}
+
+	c.state = imap.ConnStateSelected
+	// TODO: forbid write commands in read-only mode
+
+	var (
+		cmdName string
+		code    imap.ResponseCode
+	)
+	if readOnly {
+		cmdName = "EXAMINE"
+		code = "READ-ONLY"
+	} else {
+		cmdName = "SELECT"
+		code = "READ-WRITE"
+	}
+	return c.writeStatusResp(tag, &imap.StatusResponse{
+		Type: imap.StatusResponseTypeOK,
+		Code: code,
+		Text: fmt.Sprintf("%v completed", cmdName),
+	})
+}
+
+func (c *Conn) handleUnselect(dec *imapwire.Decoder, expunge bool) error {
+	if !dec.ExpectCRLF() {
+		return dec.Err()
+	}
+
+	if err := c.checkState(imap.ConnStateSelected); err != nil {
+		return err
+	}
+
+	if expunge {
+		w := &ExpungeWriter{}
+		if err := c.session.Expunge(w, nil); err != nil {
+			return err
+		}
+	}
+
+	if err := c.session.Unselect(); err != nil {
+		return err
+	}
+
+	c.state = imap.ConnStateAuthenticated
+	return nil
+}
+
+func (c *Conn) writeExists(numMessages uint32) error {
+	enc := newResponseEncoder(c)
+	defer enc.end()
+	return enc.Atom("*").SP().Number(numMessages).SP().Atom("EXISTS").CRLF()
+}
+
+func (c *Conn) writeObsoleteRecent(n uint32) error {
+	enc := newResponseEncoder(c)
+	defer enc.end()
+	return enc.Atom("*").SP().Number(n).SP().Atom("RECENT").CRLF()
+}
+
+func (c *Conn) writeUIDValidity(uidValidity uint32) error {
+	enc := newResponseEncoder(c)
+	defer enc.end()
+	enc.Atom("*").SP().Atom("OK").SP()
+	enc.Special('[').Atom("UIDVALIDITY").SP().Number(uidValidity).Special(']')
+	enc.SP().Text("UIDs valid")
+	return enc.CRLF()
+}
+
+func (c *Conn) writeUIDNext(uidNext imap.UID) error {
+	enc := newResponseEncoder(c)
+	defer enc.end()
+	enc.Atom("*").SP().Atom("OK").SP()
+	enc.Special('[').Atom("UIDNEXT").SP().UID(uidNext).Special(']')
+	enc.SP().Text("Predicted next UID")
+	return enc.CRLF()
+}
+
+func (c *Conn) writeFlags(flags []imap.Flag) error {
+	enc := newResponseEncoder(c)
+	defer enc.end()
+	enc.Atom("*").SP().Atom("FLAGS").SP().List(len(flags), func(i int) {
+		enc.Flag(flags[i])
+	})
+	return enc.CRLF()
+}
+
+func (c *Conn) writePermanentFlags(flags []imap.Flag) error {
+	enc := newResponseEncoder(c)
+	defer enc.end()
+	enc.Atom("*").SP().Atom("OK").SP()
+	enc.Special('[').Atom("PERMANENTFLAGS").SP().List(len(flags), func(i int) {
+		enc.Flag(flags[i])
+	}).Special(']')
+	enc.SP().Text("Permanent flags")
+	return enc.CRLF()
+}