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package email
import (
"fmt"
"net/mail"
"strings"
"time"
)
type ComposeRequest struct {
MessageID string
FromAddress string
FromName string
ToAddresses string
CcAddresses string
Subject string
HTMLBody string
}
func Compose(request ComposeRequest) []byte {
var message strings.Builder
fromHeader := formatMailAddress(request.FromName, request.FromAddress)
message.WriteString(fmt.Sprintf("From: %s\r\n", fromHeader))
message.WriteString(fmt.Sprintf("To: %s\r\n", request.ToAddresses))
if request.CcAddresses != "" {
message.WriteString(fmt.Sprintf("Cc: %s\r\n", request.CcAddresses))
}
message.WriteString(fmt.Sprintf("Subject: %s\r\n", request.Subject))
message.WriteString(fmt.Sprintf("Date: %s\r\n", time.Now().Format(time.RFC1123Z)))
message.WriteString(fmt.Sprintf("Message-ID: %s\r\n", request.MessageID))
message.WriteString("MIME-Version: 1.0\r\n")
message.WriteString("Content-Type: text/html; charset=UTF-8\r\n")
message.WriteString("\r\n")
message.WriteString(request.HTMLBody)
return []byte(message.String())
}
func EnvelopeRecipients(toAddresses string, ccAddresses string, bccAddresses string) []string {
var recipients []string
for _, addressGroup := range []string{toAddresses, ccAddresses, bccAddresses} {
if addressGroup == "" {
continue
}
parsed, parseError := mail.ParseAddressList(addressGroup)
if parseError != nil {
for _, raw := range strings.Split(addressGroup, AddressJoiner) {
trimmed := strings.TrimSpace(raw)
if trimmed != "" {
recipients = append(recipients, trimmed)
}
}
continue
}
for _, address := range parsed {
recipients = append(recipients, address.Address)
}
}
return recipients
}
func formatMailAddress(displayName string, emailAddress string) string {
if displayName == "" {
return emailAddress
}
return fmt.Sprintf("\"%s\" <%s>", displayName, emailAddress)
}
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