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