From faf7c3566be12f22f346f978d3a5fcf68e4bc8b4 Mon Sep 17 00:00:00 2001
From: Runxi Yu <me@runxiyu.org>
Date: Thu, 16 Jan 2025 12:34:46 +0800
Subject: IMAP: Re-add server protocol state

---
 serve_imap.go | 23 ++++++++++++++++++++++-
 1 file changed, 22 insertions(+), 1 deletion(-)

diff --git a/serve_imap.go b/serve_imap.go
index 524f130..ad50c27 100644
--- a/serve_imap.go
+++ b/serve_imap.go
@@ -15,17 +15,28 @@ import (
 	"go.lindenii.runxiyu.org/lindenii-common/clog"
 )
 
+type imap_server_state_t uint
+
+const (
+	imap_server_state_not_authenticated imap_server_state_t = iota
+	imap_server_state_authenticated
+	imap_server_state_selected
+	imap_server_state_logout
+)
+
 type imap_recv_session struct {
 	buf_conn       *bufio.ReadWriter
 	net_conn       net.Conn
 	tls_conn       *tls.Conn
 	my_server_name string
 	db             *pgxpool.Pool
+	server_state   imap_server_state_t
 }
 
 const IMAP_CAPABILITIES = "CAPABILITY IMAP4rev2 AUTH=PLAIN"
 
 func (session *imap_recv_session) handle(ctx context.Context) error {
+	session.server_state = imap_server_state_not_authenticated
 	session.buf_conn = bufio.NewReadWriter(bufio.NewReader(session.net_conn), bufio.NewWriter(session.net_conn))
 	_, _ = session.buf_conn.WriteString("* OK [" + IMAP_CAPABILITIES + "] " + VERSION + "\r\n")
 	_ = session.buf_conn.Flush()
@@ -52,6 +63,11 @@ func (session *imap_recv_session) handle(ctx context.Context) error {
 			_, _ = session.buf_conn.WriteString(tag + " OK CAPABILITY completed\r\n")
 			_ = session.buf_conn.Flush()
 		case "AUTHENTICATE":
+			if session.server_state != imap_server_state_authenticated {
+				_, _ = session.buf_conn.WriteString(line + " TODO you are already authenticated")
+				_ = session.buf_conn.Flush()
+				break switch_cmd
+			}
 			space_that_ends_the_method := strings.IndexByte(param, ' ')
 			method := param[:space_that_ends_the_method]
 			switch method {
@@ -74,7 +90,12 @@ func (session *imap_recv_session) handle(ctx context.Context) error {
 					session.buf_conn.WriteString(" TODO need three sasl segments\r\n")
 					break switch_cmd
 				}
-				authcid, passwd := segments[1], segments[2]
+				authcid, passwd := string(segments[1]), string(segments[2])
+				if authcid == "test" && passwd == "test" { // TODO
+					session.server_state = imap_server_state_authenticated
+				} else {
+
+				}
 			default:
 				_, _ = session.buf_conn.WriteString(line + " TODO i don't know this authentication method\r\n")
 				_ = session.buf_conn.Flush()
-- 
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