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statping/notifiers/email.go

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// Statup
// Copyright (C) 2018. Hunter Long and the project contributors
// Written by Hunter Long <info@socialeck.com> and the project contributors
//
// https://github.com/hunterlong/statup
//
// The licenses for most software and other practical works are designed
// to take away your freedom to share and change the works. By contrast,
// the GNU General Public License is intended to guarantee your freedom to
// share and change all versions of a program--to make sure it remains free
// software for all its users.
//
// You should have received a copy of the GNU General Public License
// along with this program. If not, see <http://www.gnu.org/licenses/>.
package notifiers
import (
"bytes"
"crypto/tls"
"fmt"
"github.com/go-mail/mail"
"github.com/hunterlong/statup/core/notifier"
"github.com/hunterlong/statup/types"
"github.com/hunterlong/statup/utils"
"html/template"
"net/smtp"
"time"
)
const (
mainEmailTemplate = `<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta name="viewport" content="width=device-width, initial-scale=1.0" />
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
<title>Statup email</title>
</head>
<body style="-webkit-text-size-adjust: none; box-sizing: border-box; color: #74787E; font-family: Arial, 'Helvetica Neue', Helvetica, sans-serif; height: 100%; line-height: 1.4; margin: 0; width: 100% !important;" bgcolor="#F2F4F6">
<style type="text/css">
body {
width: 100% !important;
height: 100%;
margin: 0;
line-height: 1.4;
background-color: #F2F4F6;
color: #74787E;
-webkit-text-size-adjust: none;
}
@media only screen and (max-width: 600px) {
.email-body_inner {
width: 100% !important;
}
.email-footer {
width: 100% !important;
}
}
@media only screen and (max-width: 500px) {
.button {
width: 100% !important;
}
}
</style>
<table class="email-wrapper" width="100%" cellpadding="0" cellspacing="0" style="box-sizing: border-box; font-family: Arial, 'Helvetica Neue', Helvetica, sans-serif; margin: 0; padding: 0; width: 100%;" bgcolor="#F2F4F6">
<tr>
<td align="center" style="box-sizing: border-box; font-family: Arial, 'Helvetica Neue', Helvetica, sans-serif; word-break: break-word;">
<table class="email-content" width="100%" cellpadding="0" cellspacing="0" style="box-sizing: border-box; font-family: Arial, 'Helvetica Neue', Helvetica, sans-serif; margin: 0; padding: 0; width: 100%;">
<tr>
<td class="email-body" width="100%" cellpadding="0" cellspacing="0" style="-premailer-cellpadding: 0; -premailer-cellspacing: 0; border-bottom-color: #EDEFF2; border-bottom-style: solid; border-bottom-width: 1px; border-top-color: #EDEFF2; border-top-style: solid; border-top-width: 1px; box-sizing: border-box; font-family: Arial, 'Helvetica Neue', Helvetica, sans-serif; margin: 0; padding: 0; width: 100%; word-break: break-word;" bgcolor="#FFFFFF">
<table class="email-body_inner" align="center" width="570" cellpadding="0" cellspacing="0" style="box-sizing: border-box; font-family: Arial, 'Helvetica Neue', Helvetica, sans-serif; margin: 0 auto; padding: 0; width: 570px;" bgcolor="#FFFFFF">
<tr>
<td class="content-cell" style="box-sizing: border-box; font-family: Arial, 'Helvetica Neue', Helvetica, sans-serif; padding: 35px; word-break: break-word;">
<h1 style="box-sizing: border-box; color: #2F3133; font-family: Arial, 'Helvetica Neue', Helvetica, sans-serif; font-size: 19px; font-weight: bold; margin-top: 0;" align="left">
{{ .Name }} is {{ if .Online }}Online{{else}}Offline{{end}}!
</h1>
<p style="box-sizing: border-box; color: #74787E; font-family: Arial, 'Helvetica Neue', Helvetica, sans-serif; font-size: 16px; line-height: 1.5em; margin-top: 0;" align="left">
{{ if .Online }}
Your Statup service <a target="_blank" href="{{.Domain}}">{{.Name}}</a> is back online. This service has been triggered with a HTTP status code of '{{.LastStatusCode}}' and is currently online based on your requirements. Your service was reported online at {{.CreatedAt}}. </p>
{{ else }}
Your Statup service <a target="_blank" href="{{.Domain}}">{{.Name}}</a> has been triggered with a HTTP status code of '{{.LastStatusCode}}' and is currently offline based on your requirements. This failure was created on {{.CreatedAt}}. </p>
{{ end }}
{{if .LastResponse }}
<h1 style="box-sizing: border-box; color: #2F3133; font-family: Arial, 'Helvetica Neue', Helvetica, sans-serif; font-size: 19px; font-weight: bold; margin-top: 0;" align="left">
Last Response</h1>
<p style="box-sizing: border-box; color: #74787E; font-family: Arial, 'Helvetica Neue', Helvetica, sans-serif; font-size: 16px; line-height: 1.5em; margin-top: 0;" align="left">
{{ .LastResponse }} </p> {{end}}
<table class="body-sub" style="border-top-color: #EDEFF2; border-top-style: solid; border-top-width: 1px; box-sizing: border-box; font-family: Arial, 'Helvetica Neue', Helvetica, sans-serif; margin-top: 25px; padding-top: 25px;">
<td style="box-sizing: border-box; font-family: Arial, 'Helvetica Neue', Helvetica, sans-serif; word-break: break-word;"> <a href="/service/{{.Id}}" class="button button--blue" target="_blank" style="-webkit-text-size-adjust: none; background: #3869D4; border-color: #3869d4; border-radius: 3px; border-style: solid; border-width: 10px 18px; box-shadow: 0 2px 3px rgba(0, 0, 0, 0.16); box-sizing: border-box; color: #FFF; display: inline-block; font-family: Arial, 'Helvetica Neue', Helvetica, sans-serif; text-decoration: none;">View Service</a> </td>
<td style="box-sizing: border-box; font-family: Arial, 'Helvetica Neue', Helvetica, sans-serif; word-break: break-word;"> <a href="/dashboard" class="button button--blue" target="_blank" style="-webkit-text-size-adjust: none; background: #3869D4; border-color: #3869d4; border-radius: 3px; border-style: solid; border-width: 10px 18px; box-shadow: 0 2px 3px rgba(0, 0, 0, 0.16); box-sizing: border-box; color: #FFF; display: inline-block; font-family: Arial, 'Helvetica Neue', Helvetica, sans-serif; text-decoration: none;">Statup Dashboard</a> </td>
</table>
</td>
</tr>
</table>
</td>
</tr>
</table>
</td>
</tr>
</table>
</body>
</html>`
)
var (
mailer *mail.Dialer
)
type email struct {
*notifier.Notification
}
var emailer = &email{&notifier.Notification{
Method: "email",
Title: "email",
Description: "Send emails via SMTP when services are online or offline.",
Author: "Hunter Long",
AuthorUrl: "https://github.com/hunterlong",
Icon: "far fa-envelope",
Form: []notifier.NotificationForm{{
Type: "text",
Title: "SMTP Host",
Placeholder: "Insert your SMTP Host here.",
DbField: "Host",
}, {
Type: "text",
Title: "SMTP Username",
Placeholder: "Insert your SMTP Username here.",
DbField: "Username",
}, {
Type: "password",
Title: "SMTP Password",
Placeholder: "Insert your SMTP Password here.",
DbField: "Password",
}, {
Type: "number",
Title: "SMTP Port",
Placeholder: "Insert your SMTP Port here.",
DbField: "Port",
}, {
Type: "text",
Title: "Outgoing email Address",
Placeholder: "Insert your Outgoing email Address",
DbField: "Var1",
}, {
Type: "email",
Title: "Send Alerts To",
Placeholder: "email Address",
DbField: "Var2",
}},
}}
func init() {
err := notifier.AddNotifier(emailer)
if err != nil {
panic(err)
}
}
// Send will send the SMTP email with your authentication It accepts type: *emailOutgoing
func (u *email) Send(msg interface{}) error {
email := msg.(*emailOutgoing)
err := u.dialSend(email)
if err != nil {
return err
}
return nil
}
type emailOutgoing struct {
To string
Subject string
Template string
From string
Data interface{}
Source string
Sent bool
}
// OnFailure will trigger failing service
func (u *email) OnFailure(s *types.Service, f *types.Failure) {
email := &emailOutgoing{
To: u.Var2,
Subject: fmt.Sprintf("Service %v is Failing", s.Name),
Template: mainEmailTemplate,
Data: interface{}(s),
From: u.Var1,
}
u.AddQueue(s.Id, email)
u.Online = false
}
// OnSuccess will trigger successful service
func (u *email) OnSuccess(s *types.Service) {
if !u.Online {
u.ResetUniqueQueue(s.Id)
email := &emailOutgoing{
To: u.Var2,
Subject: fmt.Sprintf("Service %v is Back Online", s.Name),
Template: mainEmailTemplate,
Data: interface{}(s),
From: u.Var1,
}
u.AddQueue(s.Id, email)
}
u.Online = true
}
func (u *email) Select() *notifier.Notification {
return u.Notification
}
// OnSave triggers when this notifier has been saved
func (u *email) OnSave() error {
utils.Log(1, fmt.Sprintf("Notification %v is receiving updated information.", u.Method))
// Do updating stuff here
return nil
}
// OnTest triggers when this notifier has been saved
func (u *email) OnTest() error {
host := fmt.Sprintf("%v:%v", u.Host, u.Port)
dial, err := smtp.Dial(host)
if err != nil {
return err
}
err = dial.StartTLS(&tls.Config{InsecureSkipVerify: true})
if err != nil {
return err
}
auth := smtp.PlainAuth("", u.Username, u.Password, host)
err = dial.Auth(auth)
if err != nil {
return err
}
testService := &types.Service{
Id: 1,
Name: "Example Service",
Domain: "https://www.youtube.com/watch?v=-u6DvRyyKGU",
ExpectedStatus: 200,
Interval: 30,
Type: "http",
Method: "GET",
Timeout: 20,
LastStatusCode: 200,
Expected: types.NewNullString("test example"),
LastResponse: "<html>this is an example response</html>",
CreatedAt: time.Now().Add(-24 * time.Hour),
}
email := &emailOutgoing{
To: u.Var2,
Subject: fmt.Sprintf("Service %v is Back Online", testService.Name),
Template: mainEmailTemplate,
Data: interface{}(testService),
From: u.Var1,
}
err = u.Send(email)
return err
}
func (u *email) dialSend(email *emailOutgoing) error {
mailer = mail.NewDialer(emailer.Host, emailer.Port, emailer.Username, emailer.Password)
mailer.TLSConfig = &tls.Config{InsecureSkipVerify: true}
emailSource(email)
m := mail.NewMessage()
m.SetHeader("From", email.From)
m.SetHeader("To", email.To)
m.SetHeader("Subject", email.Subject)
m.SetBody("text/html", email.Source)
if err := mailer.DialAndSend(m); err != nil {
utils.Log(3, fmt.Sprintf("email '%v' sent to: %v (size: %v) %v", email.Subject, email.To, len([]byte(email.Source)), err))
return err
}
return nil
}
func emailSource(email *emailOutgoing) {
source := emailTemplate(email.Template, email.Data)
email.Source = source
}
func emailTemplate(contents string, data interface{}) string {
t := template.New("email")
t, err := t.Parse(contents)
if err != nil {
utils.Log(3, err)
}
var tpl bytes.Buffer
if err := t.Execute(&tpl, data); err != nil {
utils.Log(2, err)
}
result := tpl.String()
return result
}
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