first commit

2026-04-26 21:41:46 +03:00
commit b6e74bd024
56 changed files with 16114 additions and 0 deletions
--- a/pkg/mailer/mailer.go
+++ b/pkg/mailer/mailer.go
@@ -0,0 +1,123 @@
+package mailer
+
+import (
+	"crypto/tls"
+	"fmt"
+	"net/smtp"
+	"os"
+	"strconv"
+	"strings"
+)
+
+func envBool(key string) bool {
+	v, err := strconv.ParseBool(strings.TrimSpace(os.Getenv(key)))
+	if err != nil {
+		return false
+	}
+	return v
+}
+
+func Send(to, subject, body string) error {
+	host := strings.TrimSpace(os.Getenv("EMAIL_HOST"))
+	port := strings.TrimSpace(os.Getenv("EMAIL_PORT"))
+	from := strings.TrimSpace(os.Getenv("EMAIL_FROM"))
+	username := strings.TrimSpace(os.Getenv("EMAIL_HOST_USER"))
+	password := strings.TrimSpace(os.Getenv("EMAIL_HOST_PASSWORD"))
+
+	if host == "" || port == "" || from == "" {
+		return fmt.Errorf("email configuration is incomplete")
+	}
+
+	addr := host + ":" + port
+	msg := strings.Join([]string{
+		"From: " + from,
+		"To: " + to,
+		"Subject: " + subject,
+		"MIME-Version: 1.0",
+		"Content-Type: text/plain; charset=UTF-8",
+		"",
+		body,
+	}, "\r\n")
+
+	var auth smtp.Auth
+	if username != "" {
+		auth = smtp.PlainAuth("", username, password, host)
+	}
+
+	useSSL := envBool("EMAIL_USE_SSL")
+	useTLS := envBool("EMAIL_USE_TLS")
+
+	if useSSL {
+		conn, err := tls.Dial("tcp", addr, &tls.Config{ServerName: host})
+		if err != nil {
+			return err
+		}
+		defer conn.Close()
+
+		client, err := smtp.NewClient(conn, host)
+		if err != nil {
+			return err
+		}
+		defer client.Quit()
+
+		if auth != nil {
+			if err := client.Auth(auth); err != nil {
+				return err
+			}
+		}
+
+		if err := client.Mail(from); err != nil {
+			return err
+		}
+		if err := client.Rcpt(to); err != nil {
+			return err
+		}
+
+		w, err := client.Data()
+		if err != nil {
+			return err
+		}
+		if _, err := w.Write([]byte(msg)); err != nil {
+			_ = w.Close()
+			return err
+		}
+		return w.Close()
+	}
+
+	if !useTLS {
+		return smtp.SendMail(addr, auth, from, []string{to}, []byte(msg))
+	}
+
+	client, err := smtp.Dial(addr)
+	if err != nil {
+		return err
+	}
+	defer client.Quit()
+
+	if err := client.StartTLS(&tls.Config{ServerName: host}); err != nil {
+		return err
+	}
+
+	if auth != nil {
+		if err := client.Auth(auth); err != nil {
+			return err
+		}
+	}
+
+	if err := client.Mail(from); err != nil {
+		return err
+	}
+	if err := client.Rcpt(to); err != nil {
+		return err
+	}
+
+	w, err := client.Data()
+	if err != nil {
+		return err
+	}
+	if _, err := w.Write([]byte(msg)); err != nil {
+		_ = w.Close()
+		return err
+	}
+	return w.Close()
+}
--- a/pkg/mailer/mailer_test.go
+++ b/pkg/mailer/mailer_test.go
@@ -0,0 +1,130 @@
+package mailer
+
+import (
+	"bufio"
+	"net"
+	"strconv"
+	"strings"
+	"testing"
+)
+
+func TestSendFailsWhenConfigMissing(t *testing.T) {
+	t.Setenv("EMAIL_HOST", "")
+	t.Setenv("EMAIL_PORT", "")
+	t.Setenv("EMAIL_FROM", "")
+
+	if err := Send("user@example.com", "subj", "body"); err == nil {
+		t.Fatal("expected error for incomplete email config")
+	}
+}
+
+func TestSendPlainSMTP(t *testing.T) {
+	ln, err := net.Listen("tcp", "127.0.0.1:0")
+	if err != nil {
+		t.Fatalf("failed to listen: %v", err)
+	}
+	defer ln.Close()
+
+	done := make(chan error, 1)
+	go func() {
+		conn, err := ln.Accept()
+		if err != nil {
+			done <- err
+			return
+		}
+		defer conn.Close()
+
+		r := bufio.NewReader(conn)
+		w := bufio.NewWriter(conn)
+		write := func(s string) error {
+			if _, err := w.WriteString(s); err != nil {
+				return err
+			}
+			return w.Flush()
+		}
+
+		if err := write("220 localhost Simple Mail Transfer Service Ready\r\n"); err != nil {
+			done <- err
+			return
+		}
+
+		for {
+			line, err := r.ReadString('\n')
+			if err != nil {
+				done <- err
+				return
+			}
+			cmd := strings.TrimSpace(line)
+
+			switch {
+			case strings.HasPrefix(strings.ToUpper(cmd), "EHLO") || strings.HasPrefix(strings.ToUpper(cmd), "HELO"):
+				if err := write("250-localhost\r\n250 AUTH PLAIN\r\n"); err != nil {
+					done <- err
+					return
+				}
+			case strings.HasPrefix(strings.ToUpper(cmd), "MAIL FROM"):
+				if err := write("250 OK\r\n"); err != nil {
+					done <- err
+					return
+				}
+			case strings.HasPrefix(strings.ToUpper(cmd), "RCPT TO"):
+				if err := write("250 OK\r\n"); err != nil {
+					done <- err
+					return
+				}
+			case strings.HasPrefix(strings.ToUpper(cmd), "DATA"):
+				if err := write("354 End data with <CR><LF>.<CR><LF>\r\n"); err != nil {
+					done <- err
+					return
+				}
+				for {
+					d, err := r.ReadString('\n')
+					if err != nil {
+						done <- err
+						return
+					}
+					if strings.TrimSpace(d) == "." {
+						break
+					}
+				}
+				if err := write("250 OK queued\r\n"); err != nil {
+					done <- err
+					return
+				}
+			case strings.HasPrefix(strings.ToUpper(cmd), "QUIT"):
+				_ = write("221 Bye\r\n")
+				done <- nil
+				return
+			default:
+				if err := write("250 OK\r\n"); err != nil {
+					done <- err
+					return
+				}
+			}
+		}
+	}()
+
+	host, portStr, err := net.SplitHostPort(ln.Addr().String())
+	if err != nil {
+		t.Fatalf("failed to parse listener address: %v", err)
+	}
+	if _, err := strconv.Atoi(portStr); err != nil {
+		t.Fatalf("invalid test smtp port: %v", err)
+	}
+
+	t.Setenv("EMAIL_HOST", host)
+	t.Setenv("EMAIL_PORT", portStr)
+	t.Setenv("EMAIL_FROM", "noreply@example.com")
+	t.Setenv("EMAIL_HOST_USER", "")
+	t.Setenv("EMAIL_HOST_PASSWORD", "")
+	t.Setenv("EMAIL_USE_TLS", "false")
+	t.Setenv("EMAIL_USE_SSL", "false")
+
+	if err := Send("user@example.com", "Verify", "Hello"); err != nil {
+		t.Fatalf("expected send success, got error: %v", err)
+	}
+
+	if err := <-done; err != nil {
+		t.Fatalf("smtp server finished with error: %v", err)
+	}
+}