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email.go
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email.go
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package main
import (
"bytes"
"crypto/tls"
"errors"
"fmt"
"net"
"net/smtp"
"strings"
"text/template"
"github.com/coinpaprika/ratelimiter"
"github.com/jordan-wright/email"
)
var emailAuth smtp.Auth
var emailReportLimiter *ratelimiter.RateLimiter
func InitEmailAuth() {
emailAuth = smtp.PlainAuth("", Configuration.Smtp.User, Configuration.Smtp.Pass, Configuration.Smtp.Address)
}
type ReportReason struct {
Post
ReportUser string
ID string
Date []byte
Reason string
IP string
Hostname string
}
var reportRateLimited = errors.New("Rate limited")
func SendEmailOnReport(post Post, username string, reason string, c *tls.Conn) error {
if !Configuration.Smtp.Enabled {
return errors.New("SMTP is not enabled on this instance.")
}
if emailReportLimiter != nil {
stat, err := emailReportLimiter.Check(username)
if err != nil {
return err
}
if stat.IsLimited {
return reportRateLimited
}
if err := emailReportLimiter.Inc(username); err != nil {
return err
}
}
var report ReportReason
report.ID = string(post.ID)
report.Post = post
report.Reason = reason
report.Date, _ = post.Time.MarshalText()
report.ReportUser = username
ipport := c.RemoteAddr().String() // client's ip address
ip, _, err := net.SplitHostPort(ipport)
if err != nil {
return err
}
hostname, err := net.LookupAddr(ip)
if err != nil {
return err
}
report.IP = ip
report.Hostname = strings.Join(hostname, " - ")
temp, err := template.New("email").Parse(emailReportTemp)
if err != nil {
return err
}
var buf bytes.Buffer
if err := temp.Execute(&buf, report); err != nil {
return err
}
// send email
em := email.NewEmail()
em.From = Configuration.Smtp.From
em.To = Configuration.Admin.Email
em.Subject = fmt.Sprintf("%s report - %s ", Configuration.ForumName, report.ID)
em.Text = buf.Bytes()
return sendEmail(em)
}
func SendEmailOnRegistration(username, emailAddr string, validation []byte) error {
if !Configuration.Smtp.Enabled {
return nil
}
em := email.NewEmail()
em.From = Configuration.Smtp.From
em.To = []string{emailAddr}
em.Subject = "larigot: new user"
em.Text = []byte(fmt.Sprintf("Welcome to %s! Go verify your account, go to the following link:\n\ngemini://%s/verify/%s/", Configuration.ForumName, Configuration.Hostname, validation))
return sendEmail(em)
}
func sendEmail(em *email.Email) error {
address := Configuration.Smtp.Address + ":" + Configuration.Smtp.Port
tlsConfig := &tls.Config{ServerName: Configuration.Smtp.Address}
switch strings.ToLower(Configuration.Smtp.Type) {
case "plain":
return em.Send(address, emailAuth)
case "tls":
return em.SendWithTLS(address, emailAuth, tlsConfig)
case "starttls":
return em.SendWithStartTLS(address, emailAuth, tlsConfig)
default:
return errors.New("Invalid config.Smtp.Type. Allowed values: plain/tls/starttls")
}
}