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330 lines
10 KiB
330 lines
10 KiB
package main
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import (
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"bytes"
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"context"
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"crypto/tls"
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"fmt"
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"html/template"
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"net/smtp"
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"strings"
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"time"
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jEmail "github.com/jordan-wright/email"
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"github.com/knz/strtime"
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"github.com/mailgun/mailgun-go/v4"
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)
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// implements email sending, right now via smtp or mailgun.
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type emailClient interface {
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send(address, fromName, fromAddr string, email *Email) error
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}
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// Mailgun client implements emailClient.
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type Mailgun struct {
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client *mailgun.MailgunImpl
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}
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func (mg *Mailgun) send(address, fromName, fromAddr string, email *Email) error {
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message := mg.client.NewMessage(
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fmt.Sprintf("%s <%s>", fromName, fromAddr),
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email.subject,
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email.text,
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address,
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)
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message.SetHtml(email.html)
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ctx, cancel := context.WithTimeout(context.Background(), time.Second*10)
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defer cancel()
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_, _, err := mg.client.Send(ctx, message)
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return err
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}
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// SMTP supports SSL/TLS and STARTTLS; implements emailClient.
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type SMTP struct {
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sslTLS bool
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server string
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port int
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auth smtp.Auth
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}
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func (sm *SMTP) send(address, fromName, fromAddr string, email *Email) error {
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e := jEmail.NewEmail()
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e.Subject = email.subject
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e.From = fmt.Sprintf("%s <%s>", fromName, fromAddr)
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e.To = []string{address}
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e.Text = []byte(email.text)
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e.HTML = []byte(email.html)
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server := fmt.Sprintf("%s:%d", sm.server, sm.port)
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tlsConfig := &tls.Config{
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InsecureSkipVerify: false,
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ServerName: sm.server,
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}
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var err error
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// err = e.Send(server, sm.auth)
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if sm.sslTLS {
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err = e.SendWithTLS(server, sm.auth, tlsConfig)
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} else {
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err = e.SendWithStartTLS(server, sm.auth, tlsConfig)
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}
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return err
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}
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// Emailer contains the email sender, email content, and methods to construct message content.
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type Emailer struct {
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fromAddr, fromName string
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lang emailLang
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sender emailClient
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}
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// Email stores content.
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type Email struct {
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subject string
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html, text string
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}
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func (emailer *Emailer) formatExpiry(expiry time.Time, tzaware bool, datePattern, timePattern string) (d, t, expiresIn string) {
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d, _ = strtime.Strftime(expiry, datePattern)
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t, _ = strtime.Strftime(expiry, timePattern)
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currentTime := time.Now()
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if tzaware {
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currentTime = currentTime.UTC()
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}
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_, _, days, hours, minutes, _ := timeDiff(expiry, currentTime)
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if days != 0 {
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expiresIn += fmt.Sprintf("%dd ", days)
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}
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if hours != 0 {
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expiresIn += fmt.Sprintf("%dh ", hours)
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}
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if minutes != 0 {
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expiresIn += fmt.Sprintf("%dm ", minutes)
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}
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expiresIn = strings.TrimSuffix(expiresIn, " ")
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return
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}
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// NewEmailer configures and returns a new emailer.
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func NewEmailer(app *appContext) *Emailer {
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emailer := &Emailer{
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fromAddr: app.config.Section("email").Key("address").String(),
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fromName: app.config.Section("email").Key("from").String(),
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lang: app.storage.lang.Email[app.storage.lang.chosenEmailLang],
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}
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method := app.config.Section("email").Key("method").String()
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if method == "smtp" {
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sslTls := false
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if app.config.Section("smtp").Key("encryption").String() == "ssl_tls" {
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sslTls = true
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}
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username := ""
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if u := app.config.Section("smtp").Key("username").MustString(""); u != "" {
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username = u
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} else {
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username = emailer.fromAddr
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}
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emailer.NewSMTP(app.config.Section("smtp").Key("server").String(), app.config.Section("smtp").Key("port").MustInt(465), username, app.config.Section("smtp").Key("password").String(), sslTls)
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} else if method == "mailgun" {
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emailer.NewMailgun(app.config.Section("mailgun").Key("api_url").String(), app.config.Section("mailgun").Key("api_key").String())
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}
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return emailer
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}
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// NewMailgun returns a Mailgun emailClient.
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func (emailer *Emailer) NewMailgun(url, key string) {
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sender := &Mailgun{
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client: mailgun.NewMailgun(strings.Split(emailer.fromAddr, "@")[1], key),
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}
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// Mailgun client takes the base url, so we need to trim off the end (e.g 'v3/messages')
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if strings.Contains(url, "messages") {
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url = url[0:strings.LastIndex(url, "/")]
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url = url[0:strings.LastIndex(url, "/")]
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}
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sender.client.SetAPIBase(url)
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emailer.sender = sender
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}
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// NewSMTP returns an SMTP emailClient.
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func (emailer *Emailer) NewSMTP(server string, port int, username, password string, sslTLS bool) {
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emailer.sender = &SMTP{
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auth: smtp.PlainAuth("", username, password, server),
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server: server,
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port: port,
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sslTLS: sslTLS,
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}
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}
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func (emailer *Emailer) constructInvite(code string, invite Invite, app *appContext) (*Email, error) {
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email := &Email{
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subject: app.config.Section("invite_emails").Key("subject").MustString(emailer.lang.InviteEmail.get("title")),
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}
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expiry := invite.ValidTill
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d, t, expiresIn := emailer.formatExpiry(expiry, false, app.datePattern, app.timePattern)
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message := app.config.Section("email").Key("message").String()
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inviteLink := app.config.Section("invite_emails").Key("url_base").String()
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inviteLink = fmt.Sprintf("%s/%s", inviteLink, code)
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for _, key := range []string{"html", "text"} {
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fpath := app.config.Section("invite_emails").Key("email_" + key).String()
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tpl, err := template.ParseFiles(fpath)
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if err != nil {
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return nil, err
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}
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var tplData bytes.Buffer
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err = tpl.Execute(&tplData, map[string]string{
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"hello": emailer.lang.InviteEmail.get("hello"),
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"youHaveBeenInvited": emailer.lang.InviteEmail.get("youHaveBeenInvited"),
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"toJoin": emailer.lang.InviteEmail.get("toJoin"),
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"inviteExpiry": emailer.lang.InviteEmail.format("inviteExpiry", d, t, expiresIn),
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"linkButton": emailer.lang.InviteEmail.get("linkButton"),
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"invite_link": inviteLink,
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"message": message,
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})
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if err != nil {
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return nil, err
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}
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if key == "html" {
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email.html = tplData.String()
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} else {
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email.text = tplData.String()
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}
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}
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return email, nil
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}
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func (emailer *Emailer) constructExpiry(code string, invite Invite, app *appContext) (*Email, error) {
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email := &Email{
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subject: emailer.lang.InviteExpiry.get("title"),
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}
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expiry := app.formatDatetime(invite.ValidTill)
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for _, key := range []string{"html", "text"} {
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fpath := app.config.Section("notifications").Key("expiry_" + key).String()
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tpl, err := template.ParseFiles(fpath)
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if err != nil {
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return nil, err
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}
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var tplData bytes.Buffer
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err = tpl.Execute(&tplData, map[string]string{
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"inviteExpired": emailer.lang.InviteExpiry.get("inviteExpired"),
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"expiredAt": emailer.lang.InviteExpiry.format("expiredAt", "\""+code+"\"", expiry),
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"notificationNotice": emailer.lang.InviteExpiry.get("notificationNotice"),
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})
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if err != nil {
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return nil, err
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}
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if key == "html" {
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email.html = tplData.String()
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} else {
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email.text = tplData.String()
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}
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}
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return email, nil
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}
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func (emailer *Emailer) constructCreated(code, username, address string, invite Invite, app *appContext) (*Email, error) {
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email := &Email{
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subject: emailer.lang.UserCreated.get("title"),
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}
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created := app.formatDatetime(invite.Created)
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var tplAddress string
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if app.config.Section("email").Key("no_username").MustBool(false) {
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tplAddress = "n/a"
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} else {
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tplAddress = address
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}
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for _, key := range []string{"html", "text"} {
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fpath := app.config.Section("notifications").Key("created_" + key).String()
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tpl, err := template.ParseFiles(fpath)
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if err != nil {
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return nil, err
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}
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var tplData bytes.Buffer
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err = tpl.Execute(&tplData, map[string]string{
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"aUserWasCreated": emailer.lang.UserCreated.format("aUserWasCreated", "\""+code+"\""),
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"name": emailer.lang.UserCreated.get("name"),
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"address": emailer.lang.UserCreated.get("emailAddress"),
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"time": emailer.lang.UserCreated.get("time"),
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"nameVal": username,
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"addressVal": tplAddress,
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"timeVal": created,
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"notificationNotice": emailer.lang.UserCreated.get("notificationNotice"),
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})
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if err != nil {
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return nil, err
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}
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if key == "html" {
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email.html = tplData.String()
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} else {
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email.text = tplData.String()
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}
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}
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return email, nil
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}
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func (emailer *Emailer) constructReset(pwr PasswordReset, app *appContext) (*Email, error) {
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email := &Email{
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subject: emailer.lang.PasswordReset.get("title"),
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}
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d, t, expiresIn := emailer.formatExpiry(pwr.Expiry, true, app.datePattern, app.timePattern)
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message := app.config.Section("email").Key("message").String()
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for _, key := range []string{"html", "text"} {
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fpath := app.config.Section("password_resets").Key("email_" + key).String()
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tpl, err := template.ParseFiles(fpath)
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if err != nil {
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return nil, err
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}
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var tplData bytes.Buffer
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err = tpl.Execute(&tplData, map[string]string{
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"helloUser": emailer.lang.PasswordReset.format("helloUser", pwr.Username),
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"someoneHasRequestedReset": emailer.lang.PasswordReset.get("someoneHasRequestedReset"),
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"ifItWasYou": emailer.lang.PasswordReset.get("ifItWasYou"),
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"codeExpiry": emailer.lang.PasswordReset.format("codeExpiry", d, t, expiresIn),
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"ifItWasNotYou": emailer.lang.PasswordReset.get("ifItWasNotYou"),
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"pin": emailer.lang.PasswordReset.get("pin"),
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"pinVal": pwr.Pin,
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"message": message,
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})
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if err != nil {
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return nil, err
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}
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if key == "html" {
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email.html = tplData.String()
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} else {
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email.text = tplData.String()
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}
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}
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return email, nil
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}
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func (emailer *Emailer) constructDeleted(reason string, app *appContext) (*Email, error) {
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email := &Email{
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subject: emailer.lang.UserDeleted.get("title"),
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}
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for _, key := range []string{"html", "text"} {
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fpath := app.config.Section("deletion").Key("email_" + key).String()
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tpl, err := template.ParseFiles(fpath)
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if err != nil {
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return nil, err
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}
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var tplData bytes.Buffer
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err = tpl.Execute(&tplData, map[string]string{
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"yourAccountWasDeleted": emailer.lang.UserDeleted.get("yourAccountWasDeleted"),
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"reason": emailer.lang.UserDeleted.get("reason"),
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"reasonVal": reason,
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})
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if err != nil {
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return nil, err
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}
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if key == "html" {
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email.html = tplData.String()
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} else {
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email.text = tplData.String()
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}
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}
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return email, nil
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}
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// calls the send method in the underlying emailClient.
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func (emailer *Emailer) send(address string, email *Email) error {
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return emailer.sender.send(address, emailer.fromName, emailer.fromAddr, email)
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}
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