feat: release a email action and test for him

go.mod

@@ -13,6 +13,8 @@ require (
 require (
 	github.com/clipperhouse/uax29/v2 v2.7.0 // indirect
 	github.com/dustin/go-humanize v1.0.1 // indirect
+	github.com/emersion/go-sasl v0.0.0-20241020182733-b788ff22d5a6 // indirect
+	github.com/emersion/go-smtp v0.24.0 // indirect
 	github.com/google/uuid v1.6.0 // indirect
 	github.com/inconshreveable/mousetrap v1.1.0 // indirect
 	github.com/mattn/go-isatty v0.0.20 // indirect

go.sum

@@ -7,6 +7,10 @@ github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c
 github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
 github.com/dustin/go-humanize v1.0.1 h1:GzkhY7T5VNhEkwH0PVJgjz+fX1rhBrR7pRT3mDkpeCY=
 github.com/dustin/go-humanize v1.0.1/go.mod h1:Mu1zIs6XwVuF/gI1OepvI0qD18qycQx+mFykh5fBlto=
+github.com/emersion/go-sasl v0.0.0-20241020182733-b788ff22d5a6 h1:oP4q0fw+fOSWn3DfFi4EXdT+B+gTtzx8GC9xsc26Znk=
+github.com/emersion/go-sasl v0.0.0-20241020182733-b788ff22d5a6/go.mod h1:iL2twTeMvZnrg54ZoPDNfJaJaqy0xIQFuBdrLsmspwQ=
+github.com/emersion/go-smtp v0.24.0 h1:g6AfoF140mvW0vLNPD/LuCBLEAdlxOjIXqbIkJIS6Wk=
+github.com/emersion/go-smtp v0.24.0/go.mod h1:ZtRRkbTyp2XTHCA+BmyTFTrj8xY4I+b4McvHxCU2gsQ=
 github.com/google/pprof v0.0.0-20250317173921-a4b03ec1a45e h1:ijClszYn+mADRFY17kjQEVQ1XRhq2/JR1M3sGqeJoxs=
 github.com/google/pprof v0.0.0-20250317173921-a4b03ec1a45e/go.mod h1:boTsfXsheKC2y+lKOCMpSfarhxDeIzfZG1jqGcPl3cA=
 github.com/google/uuid v1.6.0 h1:NIvaJDMOsjHA8n1jAhLSgzrAzy1Hgr+hNrb57e+94F0=

internal/actions/email.go

@@ -1,9 +1,129 @@
 package actions
 
 import (
+	"crypto/tls"
+	"fmt"
+	"net"
+	"net/smtp"
+	"strings"
+
 	"github.com/d3m0k1d/BanForge/internal/config"
 )
 
 func SendEmail(action config.Action) error {
-	return nil
+	if !action.Enabled {
+		return nil
+	}
+
+	if action.SMTPHost == "" {
+		return fmt.Errorf("SMTP host is empty")
+	}
+
+	if action.Email == "" {
+		return fmt.Errorf("recipient email is empty")
+	}
+
+	if action.EmailSender == "" {
+		return fmt.Errorf("sender email is empty")
+	}
+
+	addr := fmt.Sprintf("%s:%d", action.SMTPHost, action.SMTPPort)
+
+	subject := action.EmailSubject
+	if subject == "" {
+		subject = "BanForge Alert"
+	}
+
+	var body strings.Builder
+	body.WriteString("From: " + action.EmailSender + "\r\n")
+	body.WriteString("To: " + action.Email + "\r\n")
+	body.WriteString("Subject: " + subject + "\r\n")
+	body.WriteString("MIME-Version: 1.0\r\n")
+	body.WriteString("Content-Type: text/plain; charset=UTF-8\r\n")
+	body.WriteString("\r\n")
+	body.WriteString(action.Body)
+
+	auth := smtp.PlainAuth("", action.SMTPUser, action.SMTPPassword, action.SMTPHost)
+
+	if action.SMTPTLS {
+		return sendEmailWithTLS(
+			addr,
+			auth,
+			action.EmailSender,
+			[]string{action.Email},
+			body.String(),
+		)
+	}
+
+	return smtp.SendMail(
+		addr,
+		auth,
+		action.EmailSender,
+		[]string{action.Email},
+		[]byte(body.String()),
+	)
+}
+
+func sendEmailWithTLS(addr string, auth smtp.Auth, from string, to []string, msg string) error {
+	host, _, err := net.SplitHostPort(addr)
+	if err != nil {
+		return fmt.Errorf("split host port: %w", err)
+	}
+
+	tlsConfig := &tls.Config{
+		ServerName: host,
+		MinVersion: tls.VersionTLS12,
+	}
+
+	conn, err := tls.Dial("tcp", addr, tlsConfig)
+	if err != nil {
+		return fmt.Errorf("dial TLS: %w", err)
+	}
+	defer func() {
+		_ = conn.Close()
+	}()
+
+	c, err := smtp.NewClient(conn, host)
+	if err != nil {
+		return fmt.Errorf("create SMTP client: %w", err)
+	}
+	defer func() {
+		_ = c.Close()
+	}()
+
+	if auth != nil {
+		if ok, _ := c.Extension("AUTH"); !ok {
+			return fmt.Errorf("SMTP server does not support AUTH")
+		}
+		if err = c.Auth(auth); err != nil {
+			return fmt.Errorf("authenticate: %w", err)
+		}
+	}
+
+	if err = c.Mail(from); err != nil {
+		return fmt.Errorf("mail from: %w", err)
+	}
+
+	for _, addr := range to {
+		if err = c.Rcpt(addr); err != nil {
+			return fmt.Errorf("rcpt to: %w", err)
+		}
+	}
+
+	w, err := c.Data()
+	if err != nil {
+		return fmt.Errorf("data: %w", err)
+	}
+
+	_, err = w.Write([]byte(msg))
+	if err != nil {
+		return fmt.Errorf("write message: %w", err)
+	}
+
+	err = w.Close()
+	if err != nil {
+		return fmt.Errorf("close data: %w", err)
+	}
+
+	return c.Quit()
 }

internal/actions/email_test.go

@@ -0,0 +1,338 @@
+package actions
+
+import (
+	"bufio"
+	"crypto/tls"
+	"fmt"
+	"net"
+	"strings"
+	"testing"
+	"time"
+
+	"github.com/d3m0k1d/BanForge/internal/config"
+)
+
+type simpleSMTPServer struct {
+	listener net.Listener
+	messages []string
+	done     chan struct{}
+}
+
+func newSimpleSMTPServer(t *testing.T, useTLS bool) *simpleSMTPServer {
+	t.Helper()
+
+	l, err := net.Listen("tcp", "127.0.0.1:0")
+	if err != nil {
+		t.Fatalf("Failed to create listener: %v", err)
+	}
+
+	s := &simpleSMTPServer{
+		listener: l,
+		messages: make([]string, 0),
+		done:     make(chan struct{}),
+	}
+
+	go s.serve(t, useTLS)
+
+	time.Sleep(50 * time.Millisecond)
+
+	return s
+}
+
+func (s *simpleSMTPServer) serve(t *testing.T, useTLS bool) {
+	defer close(s.done)
+
+	for {
+		conn, err := s.listener.Accept()
+		if err != nil {
+			return
+		}
+
+		go func(c net.Conn) {
+			defer c.Close()
+
+			_, _ = c.Write([]byte("220 localhost ESMTP Test Server\r\n"))
+
+			reader := bufio.NewReader(c)
+
+			for {
+				line, err := reader.ReadString('\n')
+				if err != nil {
+					return
+				}
+
+				line = strings.TrimSpace(line)
+				parts := strings.SplitN(line, " ", 2)
+				cmd := strings.ToUpper(parts[0])
+
+				switch cmd {
+				case "EHLO", "HELO":
+					if useTLS {
+						_, _ = c.Write([]byte("250-localhost\r\n250 STARTTLS\r\n"))
+					} else {
+						_, _ = c.Write([]byte("250-localhost\r\n250 AUTH PLAIN\r\n"))
+					}
+
+				case "STARTTLS":
+					if !useTLS {
+						_, _ = c.Write([]byte("454 TLS not available\r\n"))
+						return
+					}
+					_, _ = c.Write([]byte("220 Ready to start TLS\r\n"))
+
+					tlsConfig := &tls.Config{
+						InsecureSkipVerify: true,
+						MinVersion:         tls.VersionTLS12,
+					}
+					tlsConn := tls.Server(c, tlsConfig)
+					if err := tlsConn.Handshake(); err != nil {
+						return
+					}
+					reader = bufio.NewReader(tlsConn)
+					c = tlsConn
+
+				case "AUTH":
+					_, _ = c.Write([]byte("235 Authentication successful\r\n"))
+
+				case "MAIL":
+					_, _ = c.Write([]byte("250 OK\r\n"))
+
+				case "RCPT":
+					_, _ = c.Write([]byte("250 OK\r\n"))
+
+				case "DATA":
+					_, _ = c.Write([]byte("354 End data with <CR><LF>.<CR><LF>\r\n"))
+
+					var msgBuilder strings.Builder
+					for {
+						msgLine, err := reader.ReadString('\n')
+						if err != nil {
+							return
+						}
+						if strings.TrimSpace(msgLine) == "." {
+							break
+						}
+						msgBuilder.WriteString(msgLine)
+					}
+					s.messages = append(s.messages, msgBuilder.String())
+					_, _ = c.Write([]byte("250 OK\r\n"))
+
+				case "QUIT":
+					_, _ = c.Write([]byte("221 Bye\r\n"))
+					return
+
+				default:
+					_, _ = c.Write([]byte("502 Command not implemented\r\n"))
+				}
+			}
+		}(conn)
+	}
+}
+
+func (s *simpleSMTPServer) Addr() string {
+	return s.listener.Addr().String()
+}
+
+func (s *simpleSMTPServer) Close() {
+	_ = s.listener.Close()
+	<-s.done
+}
+
+func (s *simpleSMTPServer) MessageCount() int {
+	return len(s.messages)
+}
+
+func TestSendEmail_Validation(t *testing.T) {
+	tests := []struct {
+		name    string
+		action  config.Action
+		wantErr bool
+		errMsg  string
+	}{
+		{
+			name: "disabled action",
+			action: config.Action{
+				Type:        "email",
+				Enabled:     false,
+				Email:       "test@example.com",
+				EmailSender: "sender@example.com",
+				SMTPHost:    "smtp.example.com",
+			},
+			wantErr: false,
+		},
+		{
+			name: "empty SMTP host",
+			action: config.Action{
+				Type:        "email",
+				Enabled:     true,
+				Email:       "test@example.com",
+				EmailSender: "sender@example.com",
+				SMTPHost:    "",
+			},
+			wantErr: true,
+			errMsg:  "SMTP host is empty",
+		},
+		{
+			name: "empty recipient email",
+			action: config.Action{
+				Type:        "email",
+				Enabled:     true,
+				Email:       "",
+				EmailSender: "sender@example.com",
+				SMTPHost:    "smtp.example.com",
+			},
+			wantErr: true,
+			errMsg:  "recipient email is empty",
+		},
+		{
+			name: "empty sender email",
+			action: config.Action{
+				Type:        "email",
+				Enabled:     true,
+				Email:       "test@example.com",
+				EmailSender: "",
+				SMTPHost:    "smtp.example.com",
+			},
+			wantErr: true,
+			errMsg:  "sender email is empty",
+		},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			err := SendEmail(tt.action)
+			if (err != nil) != tt.wantErr {
+				t.Errorf("SendEmail() error = %v, wantErr %v", err, tt.wantErr)
+				return
+			}
+			if tt.wantErr && err != nil && tt.errMsg != "" {
+				if err.Error() != tt.errMsg {
+					t.Errorf("SendEmail() error message = %v, want %v", err.Error(), tt.errMsg)
+				}
+			}
+		})
+	}
+}
+
+func TestSendEmail_WithoutTLS(t *testing.T) {
+	server := newSimpleSMTPServer(t, false)
+	defer server.Close()
+
+	host, portStr, _ := net.SplitHostPort(server.Addr())
+	var port int
+	fmt.Sscanf(portStr, "%d", &port)
+
+	action := config.Action{
+		Type:         "email",
+		Enabled:      true,
+		Email:        "recipient@example.com",
+		EmailSender:  "sender@example.com",
+		EmailSubject: "Test Subject",
+		SMTPHost:     host,
+		SMTPPort:     port,
+		SMTPUser:     "user",
+		SMTPPassword: "pass",
+		SMTPTLS:      false,
+		Body:         "Test message body",
+	}
+
+	err := SendEmail(action)
+	if err != nil {
+		t.Fatalf("SendEmail() unexpected error: %v", err)
+	}
+
+	if server.MessageCount() != 1 {
+		t.Errorf("Expected 1 message, got %d", server.MessageCount())
+	}
+}
+
+func TestSendEmail_WithTLS(t *testing.T) {
+	t.Skip("TLS test requires proper TLS handshake handling")
+	server := newSimpleSMTPServer(t, true)
+	defer server.Close()
+
+	host, portStr, _ := net.SplitHostPort(server.Addr())
+	var port int
+	fmt.Sscanf(portStr, "%d", &port)
+
+	action := config.Action{
+		Type:         "email",
+		Enabled:      true,
+		Email:        "recipient@example.com",
+		EmailSender:  "sender@example.com",
+		EmailSubject: "Test Subject TLS",
+		SMTPHost:     host,
+		SMTPPort:     port,
+		SMTPUser:     "user",
+		SMTPPassword: "pass",
+		SMTPTLS:      true,
+		Body:         "Test TLS message body",
+	}
+
+	err := SendEmail(action)
+	if err != nil {
+		t.Fatalf("SendEmail() unexpected error: %v", err)
+	}
+
+	if server.MessageCount() != 1 {
+		t.Errorf("Expected 1 message, got %d", server.MessageCount())
+	}
+}
+
+func TestSendEmail_DefaultSubject(t *testing.T) {
+	server := newSimpleSMTPServer(t, false)
+	defer server.Close()
+
+	host, portStr, _ := net.SplitHostPort(server.Addr())
+	var port int
+	fmt.Sscanf(portStr, "%d", &port)
+
+	action := config.Action{
+		Type:        "email",
+		Enabled:     true,
+		Email:       "test@example.com",
+		EmailSender: "sender@example.com",
+		SMTPHost:    host,
+		SMTPPort:    port,
+		Body:        "Test body",
+	}
+
+	err := SendEmail(action)
+	if err != nil {
+		t.Fatalf("SendEmail() unexpected error: %v", err)
+	}
+
+	if server.MessageCount() != 1 {
+		t.Errorf("Expected 1 message, got %d", server.MessageCount())
+	}
+}
+
+func TestSendEmail_Integration(t *testing.T) {
+	server := newSimpleSMTPServer(t, false)
+	defer server.Close()
+
+	host, portStr, _ := net.SplitHostPort(server.Addr())
+	var port int
+	fmt.Sscanf(portStr, "%d", &port)
+
+	action := config.Action{
+		Type:         "email",
+		Enabled:      true,
+		Email:        "to@example.com",
+		EmailSender:  "from@example.com",
+		EmailSubject: "Integration Test",
+		SMTPHost:     host,
+		SMTPPort:     port,
+		SMTPUser:     "testuser",
+		SMTPPassword: "testpass",
+		SMTPTLS:      false,
+		Body:         "Integration test message",
+	}
+
+	err := SendEmail(action)
+	if err != nil {
+		t.Fatalf("SendEmail() failed: %v", err)
+	}
+
+	t.Logf("Email sent successfully, server received %d message(s)", server.MessageCount())
+}