From 00243a622f71f04b6a9cf189eaf1d94609036a14 Mon Sep 17 00:00:00 2001
From: James Hillyerd <james@hillyerd.com>
Date: Tue, 29 Oct 2013 13:58:21 -0700
Subject: [PATCH] Framework for testing SMTP over Pipe() connection

---
 smtpd/handler_test.go | 133 ++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 133 insertions(+)
 create mode 100644 smtpd/handler_test.go

diff --git a/smtpd/handler_test.go b/smtpd/handler_test.go
new file mode 100644
index 0000000..11c3182
--- /dev/null
+++ b/smtpd/handler_test.go
@@ -0,0 +1,133 @@
+package smtpd
+
+import (
+	"github.com/jhillyerd/inbucket/config"
+	"io/ioutil"
+	"net"
+	"net/textproto"
+	"os"
+	"testing"
+	"time"
+)
+
+type scriptStep struct {
+	send   string
+	expect int
+}
+
+func TestHelo(t *testing.T) {
+	server := setupSmtpServer()
+	defer teardownSmtpServer(server)
+
+	// Test out some manged HELOs
+	playSession(t, server, []scriptStep{
+		{"HELLO", 500},
+	})
+	playSession(t, server, []scriptStep{
+		{"HELL", 500},
+	})
+	playSession(t, server, []scriptStep{
+		{"hello", 500},
+	})
+
+	// Valid HELOs
+	playSession(t, server, []scriptStep{
+		{"HELO", 250},
+	})
+	playSession(t, server, []scriptStep{
+		{"HELO mydomain", 250},
+	})
+	playSession(t, server, []scriptStep{
+		{"HELO mydom.com", 250},
+	})
+	playSession(t, server, []scriptStep{
+		{"HelO mydom.com", 250},
+	})
+}
+
+// playSession creates a new session, reads the greeting and then plays the script
+func playSession(t *testing.T, server *Server, script []scriptStep) {
+	pipe := setupSmtpSession(server)
+	c := textproto.NewConn(pipe)
+
+	if code, _, err := c.ReadCodeLine(220); err != nil {
+		t.Fatalf("Expected a 220 greeting, got %v", code)
+		return
+	}
+
+	playScriptAgainst(t, c, script)
+
+	c.Cmd("QUIT")
+	c.ReadCodeLine(221)
+}
+
+// playScriptAgainst an existing connection, does not handle server greeting
+func playScriptAgainst(t *testing.T, c *textproto.Conn, script []scriptStep) {
+	for i, step := range script {
+		id, err := c.Cmd(step.send)
+		if err != nil {
+			t.Fatalf("Step %d, failed to send %q: %v", i, step.send, err)
+			return
+		}
+
+		c.StartResponse(id)
+		if code, msg, err := c.ReadCodeLine(step.expect); err != nil {
+			t.Errorf("Step %d, sent %q, expected %v, got %v: %q",
+				i, step.send, step.expect, code, msg)
+		}
+		defer c.EndResponse(id)
+	}
+}
+
+// net.Pipe does not implement deadlines
+type mockConn struct {
+	net.Conn
+}
+
+func (m *mockConn) SetDeadline(t time.Time) error      { return nil }
+func (m *mockConn) SetReadDeadline(t time.Time) error  { return nil }
+func (m *mockConn) SetWriteDeadline(t time.Time) error { return nil }
+
+func setupSmtpServer() *Server {
+	// Setup datastore
+	path, err := ioutil.TempDir("", "inbucket")
+	if err != nil {
+		panic(err)
+	}
+	ds := NewFileDataStore(path)
+
+	// Test Server Config
+	cfg := config.SmtpConfig{
+		Ip4address:      net.IPv4(127, 0, 0, 1),
+		Ip4port:         2500,
+		Domain:          "inbucket.local",
+		DomainNoStore:   "bitbucket.local",
+		MaxRecipients:   5,
+		MaxIdleSeconds:  5,
+		MaxMessageBytes: 5000,
+		StoreMessages:   true,
+	}
+
+	// Create a server, don't start it
+	return NewSmtpServer(cfg, ds)
+}
+
+var sessionNum int
+
+func setupSmtpSession(server *Server) net.Conn {
+	// Pair of pipes to communicate
+	serverConn, clientConn := net.Pipe()
+	// Start the session
+	server.waitgroup.Add(1)
+	sessionNum++
+	go server.startSession(sessionNum, &mockConn{serverConn})
+
+	return clientConn
+}
+
+func teardownSmtpServer(server *Server) {
+	ds := server.dataStore.(*FileDataStore)
+	if err := os.RemoveAll(ds.path); err != nil {
+		panic(err)
+	}
+}