first commit

plugin/email/message.go

@@ -0,0 +1,91 @@
+package email
+
+import (
+	"errors"
+	"fmt"
+	"strings"
+	"time"
+)
+
+// Message represents an email message to be sent.
+type Message struct {
+	To      []string // Required: recipient email addresses
+	Cc      []string // Optional: carbon copy recipients
+	Bcc     []string // Optional: blind carbon copy recipients
+	Subject string   // Required: email subject
+	Body    string   // Required: email body content
+	IsHTML  bool     // Whether the body is HTML (default: false for plain text)
+	ReplyTo string   // Optional: reply-to address
+}
+
+// Validate checks that the message has all required fields.
+func (m *Message) Validate() error {
+	if len(m.To) == 0 {
+		return errors.New("at least one recipient is required")
+	}
+	if m.Subject == "" {
+		return errors.New("subject is required")
+	}
+	if m.Body == "" {
+		return errors.New("body is required")
+	}
+	return nil
+}
+
+// Format creates an RFC 5322 formatted email message.
+func (m *Message) Format(fromEmail, fromName string) string {
+	var sb strings.Builder
+
+	// From header
+	if fromName != "" {
+		sb.WriteString(fmt.Sprintf("From: %s <%s>\r\n", fromName, fromEmail))
+	} else {
+		sb.WriteString(fmt.Sprintf("From: %s\r\n", fromEmail))
+	}
+
+	// To header
+	sb.WriteString(fmt.Sprintf("To: %s\r\n", strings.Join(m.To, ", ")))
+
+	// Cc header (optional)
+	if len(m.Cc) > 0 {
+		sb.WriteString(fmt.Sprintf("Cc: %s\r\n", strings.Join(m.Cc, ", ")))
+	}
+
+	// Reply-To header (optional)
+	if m.ReplyTo != "" {
+		sb.WriteString(fmt.Sprintf("Reply-To: %s\r\n", m.ReplyTo))
+	}
+
+	// Subject header
+	sb.WriteString(fmt.Sprintf("Subject: %s\r\n", m.Subject))
+
+	// Date header (RFC 5322 format)
+	sb.WriteString(fmt.Sprintf("Date: %s\r\n", time.Now().Format(time.RFC1123Z)))
+
+	// MIME headers
+	sb.WriteString("MIME-Version: 1.0\r\n")
+
+	// Content-Type header
+	if m.IsHTML {
+		sb.WriteString("Content-Type: text/html; charset=utf-8\r\n")
+	} else {
+		sb.WriteString("Content-Type: text/plain; charset=utf-8\r\n")
+	}
+
+	// Empty line separating headers from body
+	sb.WriteString("\r\n")
+
+	// Body
+	sb.WriteString(m.Body)
+
+	return sb.String()
+}
+
+// GetAllRecipients returns all recipients (To, Cc, Bcc) as a single slice.
+func (m *Message) GetAllRecipients() []string {
+	var recipients []string
+	recipients = append(recipients, m.To...)
+	recipients = append(recipients, m.Cc...)
+	recipients = append(recipients, m.Bcc...)
+	return recipients
+}