A web blog and personal homepage engine written in Go.
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package mail
import (
"bytes"
"fmt"
"html/template"
"net/mail"
"net/url"
"strings"
"git.kirsle.net/apps/gophertype/pkg/console"
"git.kirsle.net/apps/gophertype/pkg/markdown"
"git.kirsle.net/apps/gophertype/pkg/models"
"git.kirsle.net/apps/gophertype/pkg/responses"
"git.kirsle.net/apps/gophertype/pkg/settings"
"github.com/microcosm-cc/bluemonday"
gomail "gopkg.in/gomail.v2"
)
// Email configuration.
type Email struct {
To string
ReplyTo string
Admin bool /* admin view of the email */
Subject string
UnsubscribeURL string
Data map[string]interface{}
Template string
}
// SendEmail sends an email.
func SendEmail(email Email) {
s := settings.Current
// Suppress sending any mail when no mail settings are configured, but go
// through the motions -- great for local dev.
var doNotMail bool
if !s.MailEnabled || s.MailHost == "" || s.MailPort == 0 || s.MailSender == "" {
console.Info("Suppressing email: not completely configured")
doNotMail = true
}
// Resolve the template.
tmpl, err := responses.GetFile(email.Template)
if err != nil {
console.Error("SendEmail: %s", err.Error())
return
}
// Render the template to HTML.
var html bytes.Buffer
t := template.New(email.Template)
t, err = t.Parse(string(tmpl))
if err != nil {
console.Error("SendEmail: template parsing error: %s", err.Error())
}
// Execute the template.
err = t.ExecuteTemplate(&html, email.Template, email)
if err != nil {
console.Error("SendEmail: template execution error: %s", err.Error())
}
// Condense the body down to plain text, lazily. Who even has a plain text
// email client anymore?
rawLines := strings.Split(
bluemonday.StrictPolicy().Sanitize(html.String()),
"\n",
)
var lines []string
for _, line := range rawLines {
line = strings.TrimSpace(line)
if len(line) == 0 {
continue
}
lines = append(lines, line)
}
plaintext := strings.Join(lines, "\n\n")
// If we're not actually going to send the mail, this is a good place to stop.
if doNotMail {
console.Info("Not going to send an email.")
console.Debug("The message was going to be:\n%s", plaintext)
return
}
m := gomail.NewMessage()
m.SetHeader("From", fmt.Sprintf("%s <%s>", s.Title, s.MailSender))
m.SetHeader("To", email.To)
if email.ReplyTo != "" {
m.SetHeader("Reply-To", email.ReplyTo)
}
m.SetHeader("Subject", email.Subject)
m.SetBody("text/plain", plaintext)
m.AddAlternative("text/html", html.String())
d := gomail.NewDialer(s.MailHost, s.MailPort, s.MailUsername, s.MailPassword)
console.Info("SendEmail: %s (%s) to %s", email.Subject, email.Template, email.To)
if err := d.DialAndSend(m); err != nil {
console.Error("SendEmail: %s", err.Error())
}
}
// NotifyComment sends notification emails about comments.
func NotifyComment(subject string, originURL string, c models.Comment) {
s := settings.Current
if s.BaseURL == "" {
console.Error("Can't send comment notification because the site URL is not configured")
return
}
// Prepare the email payload.
email := Email{
Template: "_builtin/email/comment.gohtml",
Subject: "Comment Added: " + subject,
Data: map[string]interface{}{
"Name": c.Name,
"Subject": subject,
"Body": template.HTML(markdown.RenderMarkdown(c.Body)),
"URL": strings.Trim(s.BaseURL, "/") + originURL,
"QuickDelete": fmt.Sprintf("%s/comments/quick-delete?d=%s&next=%s",
strings.Trim(s.BaseURL, "/"),
url.QueryEscape(c.DeleteToken),
url.QueryEscape(strings.Trim(s.BaseURL, "/")+originURL),
),
},
}
// Email the site admins.
if adminEmails, err := models.ListAdminEmails(); err == nil {
email.To = strings.Join(adminEmails, ", ")
email.Admin = true
console.Info("Mail site admin '%s' about comment notification on '%s'", email.To, c.Thread)
SendEmail(email)
}
// // Email the subscribers.
email.Admin = false
if subscribers, err := models.Comments.GetSubscribers(c.Thread); err == nil {
email.Subject = "A new comment has been added to: " + subject
for _, to := range subscribers {
// Don't email to the writer of the comment.
if to == c.Email {
continue
}
email.To = to
email.UnsubscribeURL = fmt.Sprintf("%s/comments/subscription?t=%s&e=%s",
strings.Trim(s.BaseURL, "/"),
url.QueryEscape(c.Thread),
url.QueryEscape(to),
)
console.Info("Mail subscriber '%s' about comment notification on '%s'", email.To, c.Thread)
SendEmail(email)
}
}
}
// ParseAddress parses an email address.
func ParseAddress(addr string) (*mail.Address, error) {
return mail.ParseAddress(addr)
}