Send HTML forms via email https://jlelse.dev/projects/mailygo/
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package main
import (
"bytes"
"fmt"
"net/smtp"
"sort"
"strconv"
"strings"
"time"
)
func sendForm(values FormValues) {
recipient := findRecipient(values)
sendMail(recipient, buildMessage(recipient, time.Now(), values))
}
func buildMessage(recipient string, date time.Time, values FormValues) string {
var msgBuffer bytes.Buffer
_, _ = fmt.Fprintf(&msgBuffer, "From: Forms <%s>", appConfig.Sender)
_, _ = fmt.Fprintln(&msgBuffer)
_, _ = fmt.Fprintf(&msgBuffer, "To: %s", recipient)
_, _ = fmt.Fprintln(&msgBuffer)
if replyTo := findReplyTo(values); replyTo != "" {
_, _ = fmt.Fprintf(&msgBuffer, "Reply-To: %s", replyTo)
_, _ = fmt.Fprintln(&msgBuffer)
}
_, _ = fmt.Fprintf(&msgBuffer, "Date: %s", date.Format(time.RFC1123Z))
_, _ = fmt.Fprintln(&msgBuffer)
_, _ = fmt.Fprintf(&msgBuffer, "Subject: New submission on %s", findFormName(values))
_, _ = fmt.Fprintln(&msgBuffer)
_, _ = fmt.Fprintln(&msgBuffer)
bodyValues := removeMetaValues(values)
var keys []string
for key, _ := range bodyValues {
keys = append(keys, key)
}
sort.Strings(keys)
for _, key := range keys {
_, _ = fmt.Fprint(&msgBuffer, key)
_, _ = fmt.Fprint(&msgBuffer, ": ")
_, _ = fmt.Fprintln(&msgBuffer, strings.Join(bodyValues[key], ", "))
}
return msgBuffer.String()
}
func sendMail(to, message string) {
auth := smtp.PlainAuth("", appConfig.SmtpUser, appConfig.SmtpPassword, appConfig.SmtpHost)
err := smtp.SendMail(appConfig.SmtpHost+":"+strconv.Itoa(appConfig.SmtpPort), auth, appConfig.Sender, []string{to}, []byte(message))
if err != nil {
fmt.Println("Failed to send mail:", err.Error())
}
}
func findRecipient(values FormValues) string {
if len(values["_to"]) == 1 && values["_to"][0] != "" {
formDefinedRecipient := values["_to"][0]
for _, allowed := range appConfig.AllowedRecipients {
if formDefinedRecipient == allowed {
return formDefinedRecipient
}
}
}
return appConfig.DefaultRecipient
}
func findFormName(values FormValues) string {
if len(values["_formName"]) == 1 && values["_formName"][0] != "" {
return values["_formName"][0]
}
return "a form"
}
func findReplyTo(values FormValues) string {
if len(values["_replyTo"]) == 1 && values["_replyTo"][0] != "" {
return values["_replyTo"][0]
}
return ""
}
func removeMetaValues(values FormValues) FormValues {
cleanedValues := FormValues{}
for key, value := range values {
if !strings.HasPrefix(key, "_") {
cleanedValues[key] = value
}
}
return cleanedValues
}