Extract IMAP functions into separate file

1 files changed, 49 insertions, 0 deletions

diff --git a/imap.go b/imap.go
new file mode 100644
index 0000000..e7e7710
--- /dev/null
+++ b/imap.go
@@ -0,0 +1,49 @@
+package koushin
+
+import (
+	"github.com/emersion/go-imap"
+	imapclient "github.com/emersion/go-imap/client"
+)
+
+func (s *Server) connectIMAP() (*imapclient.Client, error) {
+	var c *imapclient.Client
+	var err error
+	if s.imap.tls {
+		c, err = imapclient.DialTLS(s.imap.host, nil)
+		if err != nil {
+			return nil, err
+		}
+	} else {
+		c, err = imapclient.Dial(s.imap.host)
+		if err != nil {
+			return nil, err
+		}
+		if !s.imap.insecure {
+			if err := c.StartTLS(nil); err != nil {
+				c.Close()
+				return nil, err
+			}
+		}
+	}
+
+	return c, err
+}
+
+func listMailboxes(conn *imapclient.Client) ([]*imap.MailboxInfo, error) {
+	ch := make(chan *imap.MailboxInfo, 10)
+	done := make(chan error, 1)
+	go func () {
+		done <- conn.List("", "*", ch)
+	}()
+
+	var mailboxes []*imap.MailboxInfo
+	for mbox := range ch {
+		mailboxes = append(mailboxes, mbox)
+	}
+
+	if err := <-done; err != nil {
+		return nil, err
+	}
+
+	return mailboxes, nil
+}