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feedback_email.go
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feedback_email.go
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package cron
import (
"bytes"
"fmt"
htmlTemplate "html/template"
"os"
"strconv"
textTemplate "text/template"
"time"
"github.com/TUM-Dev/Campus-Backend/server/model"
log "github.com/sirupsen/logrus"
"gopkg.in/gomail.v2"
_ "embed"
)
//go:embed email_templates/feedback_body.gohtml
var htmlFeedbackBody string
//go:embed email_templates/feedback_body.txt.tmpl
var txtFeedbackBody string
// iterate is a template helper to make counting possible
func iterate(count int32) []int32 {
var items []int32
var i int32
for i = 0; i < count; i++ {
items = append(items, i)
}
return items
}
func parseTemplates() (*htmlTemplate.Template, *textTemplate.Template, error) {
funcMap := textTemplate.FuncMap{"iterate": iterate}
parsedHtmlBody, err := htmlTemplate.New("htmlFeedbackBody").Funcs(funcMap).Parse(htmlFeedbackBody)
if err != nil {
return nil, nil, err
}
parsedTxtBody, err := textTemplate.New("txtFeedbackBody").Funcs(funcMap).Parse(txtFeedbackBody)
if err != nil {
return nil, nil, err
}
return parsedHtmlBody, parsedTxtBody, nil
}
type MailHeaders struct {
From string
To string
ReplyTo string //optional
Timestamp time.Time
Subject string
}
func messageWithHeaders(feedback *model.Feedback) *gomail.Message {
m := gomail.NewMessage()
// From
m.SetAddressHeader("From", os.Getenv("SMTP_FROM"), "TUM Campus App")
// To
if feedback.Recipient != "" {
m.SetHeader("To", feedback.Recipient)
} else {
m.SetAddressHeader("To", "app@tum.de", "TCA Support") // should not ever happen as checked in the api
}
// ReplyTo
if feedback.ReplyToName.Valid && feedback.ReplyToEmail.Valid {
m.SetAddressHeader("Reply-To", feedback.ReplyToEmail.String, feedback.ReplyToName.String)
} else if feedback.ReplyToEmail.Valid {
m.SetHeader("Reply-To", feedback.ReplyToEmail.String)
}
// Timestamp
if feedback.Timestamp.Valid {
m.SetDateHeader("Date", feedback.Timestamp.Time)
} else {
m.SetDateHeader("Date", time.Now())
}
// Subject
if feedback.Recipient == "app@tum.de" {
versionString := "TCA"
if feedback.AppVersion.Valid {
versionString = fmt.Sprintf("TCA %s", feedback.AppVersion.String)
}
m.SetHeader("Subject", fmt.Sprintf("[%s] %s", truncate(versionString, 10), truncate(feedback.Feedback, 150)))
} else {
m.SetHeader("Subject", "Feedback via the TUM Campus App")
}
return m
}
func truncate(str string, length int) string {
if length <= 0 {
return ""
}
if len(str) <= length {
return str
}
truncated := ""
for i, char := range str {
if i >= length {
break
}
truncated += string(char)
}
truncated += ".."
return truncated
}
func generateTemplatedMail(parsedHtmlBody *htmlTemplate.Template, parsedTxtBody *textTemplate.Template, feedback *model.Feedback) (string, string, error) {
var htmlBodyBuffer bytes.Buffer
if err := parsedHtmlBody.Execute(&htmlBodyBuffer, feedback); err != nil {
return "", "", err
}
var txtBodyBuffer bytes.Buffer
if err := parsedTxtBody.Execute(&txtBodyBuffer, feedback); err != nil {
return "", "", err
}
return htmlBodyBuffer.String(), txtBodyBuffer.String(), nil
}
func (c *CronService) feedbackEmailCron() error {
var results []model.Feedback
if err := c.db.Find(&results, "processed = false").Error; err != nil {
log.WithError(err).Error("could not get unprocessed feedback")
return err
}
parsedHtmlBody, parsedTxtBody, err := parseTemplates()
if err != nil {
log.WithError(err).Error("could not parse email templates")
return err
}
dialer, err := setupSMTPDialer()
if err != nil {
return err
}
for i, feedback := range results {
m := messageWithHeaders(&feedback)
// attach a body
htmlBodyBuffer, txtBodyBuffer, err := generateTemplatedMail(parsedHtmlBody, parsedTxtBody, &feedback)
if err != nil {
log.WithError(err).Error("Could not template mail body")
return err
}
m.SetBody("text/plain", txtBodyBuffer)
m.AddAlternative("text/html", htmlBodyBuffer)
// send mail
if err := dialer.DialAndSend(m); err != nil {
log.WithError(err).Error("could not send mail")
continue
}
log.Tracef("sending feedback %d to %v successfull", i, feedback.Recipient)
// prevent the message being send the next time around
feedback.Processed = true
if err := c.db.Save(&feedback).Error; err != nil {
log.WithError(err).Error("could not prevent mail from being send again")
}
}
return nil
}
// setupSMTPDialer sets up the SMTP dialer
func setupSMTPDialer() (*gomail.Dialer, error) {
smtpPort, err := strconv.Atoi(os.Getenv("SMTP_PORT"))
if err != nil {
log.WithError(err).Error("SMTP_PORT is not an integer")
return nil, err
}
d := gomail.NewDialer(os.Getenv("SMTP_URL"), smtpPort, os.Getenv("SMTP_USERNAME"), os.Getenv("SMTP_PASSWORD"))
return d, nil
}