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decouple email content from sender to ensure thread safety

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If two emails fired off at once, they would previously replace each
other's content and possibly send the wrong email to the wrong person.
construct* methods now return the email content, which is sent
separately.
This commit is contained in:
Harvey Tindall
2020-09-13 21:18:47 +01:00
parent 51839b5942
commit b8dfb5d6a3
3 changed files with 60 additions and 47 deletions
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email.go
+45 -37
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@@ -17,14 +17,14 @@ import (
// implements email sending, right now via smtp or mailgun.
type emailClient interface {
send(address, fromName, fromAddr string, email email) error
send(address, fromName, fromAddr string, email *Email) error
}
type Mailgun struct {
client *mailgun.MailgunImpl
}
func (mg *Mailgun) send(address, fromName, fromAddr string, email email) error {
func (mg *Mailgun) send(address, fromName, fromAddr string, email *Email) error {
message := mg.client.NewMessage(
fmt.Sprintf("%s <%s>", fromName, fromAddr),
email.subject,
@@ -45,7 +45,7 @@ type Smtp struct {
auth smtp.Auth
}
func (sm *Smtp) send(address, fromName, fromAddr string, email email) error {
func (sm *Smtp) send(address, fromName, fromAddr string, email *Email) error {
e := jEmail.NewEmail()
e.Subject = email.subject
e.From = fmt.Sprintf("%s <%s>", fromName, fromAddr)
@@ -68,12 +68,12 @@ func (sm *Smtp) send(address, fromName, fromAddr string, email email) error {
// Emailer contains the email sender, email content, and methods to construct message content.
type Emailer struct {
content email
fromAddr, fromName string
sender emailClient
}
type email struct {
// Email stores content.
type Email struct {
subject string
html, text string
}
@@ -140,10 +140,12 @@ func (emailer *Emailer) NewSMTP(server string, port int, password, host string,
}
}
func (email *Emailer) constructInvite(code string, invite Invite, app *appContext) error {
email.content.subject = app.config.Section("invite_emails").Key("subject").String()
func (emailer *Emailer) constructInvite(code string, invite Invite, app *appContext) (*Email, error) {
email := &Email{
subject: app.config.Section("invite_emails").Key("subject").String(),
}
expiry := invite.ValidTill
d, t, expires_in := email.formatExpiry(expiry, false, app.datePattern, app.timePattern)
d, t, expires_in := emailer.formatExpiry(expiry, false, app.datePattern, app.timePattern)
message := app.config.Section("email").Key("message").String()
invite_link := app.config.Section("invite_emails").Key("url_base").String()
invite_link = fmt.Sprintf("%s/%s", invite_link, code)
@@ -152,7 +154,7 @@ func (email *Emailer) constructInvite(code string, invite Invite, app *appContex
fpath := app.config.Section("invite_emails").Key("email_" + key).String()
tpl, err := template.ParseFiles(fpath)
if err != nil {
return err
return nil, err
}
var tplData bytes.Buffer
err = tpl.Execute(&tplData, map[string]string{
@@ -163,25 +165,27 @@ func (email *Emailer) constructInvite(code string, invite Invite, app *appContex
"message": message,
})
if err != nil {
return err
return nil, err
}
if key == "html" {
email.content.html = tplData.String()
email.html = tplData.String()
} else {
email.content.text = tplData.String()
email.text = tplData.String()
}
}
return nil
return email, nil
}
func (email *Emailer) constructExpiry(code string, invite Invite, app *appContext) error {
email.content.subject = "Notice: Invite expired"
func (emailer *Emailer) constructExpiry(code string, invite Invite, app *appContext) (*Email, error) {
email := &Email{
subject: "Notice: Invite expired",
}
expiry := app.formatDatetime(invite.ValidTill)
for _, key := range []string{"html", "text"} {
fpath := app.config.Section("notifications").Key("expiry_" + key).String()
tpl, err := template.ParseFiles(fpath)
if err != nil {
return err
return nil, err
}
var tplData bytes.Buffer
err = tpl.Execute(&tplData, map[string]string{
@@ -189,19 +193,21 @@ func (email *Emailer) constructExpiry(code string, invite Invite, app *appContex
"expiry": expiry,
})
if err != nil {
return err
return nil, err
}
if key == "html" {
email.content.html = tplData.String()
email.html = tplData.String()
} else {
email.content.text = tplData.String()
email.text = tplData.String()
}
}
return nil
return email, nil
}
func (email *Emailer) constructCreated(code, username, address string, invite Invite, app *appContext) error {
email.content.subject = "Notice: User created"
func (emailer *Emailer) constructCreated(code, username, address string, invite Invite, app *appContext) (*Email, error) {
email := &Email{
subject: "Notice: User created",
}
created := app.formatDatetime(invite.Created)
var tplAddress string
if app.config.Section("email").Key("no_username").MustBool(false) {
@@ -213,7 +219,7 @@ func (email *Emailer) constructCreated(code, username, address string, invite In
fpath := app.config.Section("notifications").Key("created_" + key).String()
tpl, err := template.ParseFiles(fpath)
if err != nil {
return err
return nil, err
}
var tplData bytes.Buffer
err = tpl.Execute(&tplData, map[string]string{
@@ -223,26 +229,28 @@ func (email *Emailer) constructCreated(code, username, address string, invite In
"time": created,
})
if err != nil {
return err
return nil, err
}
if key == "html" {
email.content.html = tplData.String()
email.html = tplData.String()
} else {
email.content.text = tplData.String()
email.text = tplData.String()
}
}
return nil
return email, nil
}
func (email *Emailer) constructReset(pwr Pwr, app *appContext) error {
email.content.subject = app.config.Section("password_resets").Key("subject").MustString("Password reset - Jellyfin")
d, t, expires_in := email.formatExpiry(pwr.Expiry, true, app.datePattern, app.timePattern)
func (emailer *Emailer) constructReset(pwr Pwr, app *appContext) (*Email, error) {
email := &Email{
subject: app.config.Section("password_resets").Key("subject").MustString("Password reset - Jellyfin"),
}
d, t, expires_in := emailer.formatExpiry(pwr.Expiry, true, app.datePattern, app.timePattern)
message := app.config.Section("email").Key("message").String()
for _, key := range []string{"html", "text"} {
fpath := app.config.Section("password_resets").Key("email_" + key).String()
tpl, err := template.ParseFiles(fpath)
if err != nil {
return err
return nil, err
}
var tplData bytes.Buffer
err = tpl.Execute(&tplData, map[string]string{
@@ -254,17 +262,17 @@ func (email *Emailer) constructReset(pwr Pwr, app *appContext) error {
"message": message,
})
if err != nil {
return err
return nil, err
}
if key == "html" {
email.content.html = tplData.String()
email.html = tplData.String()
} else {
email.content.text = tplData.String()
email.text = tplData.String()
}
}
return nil
return email, nil
}
func (emailer *Emailer) send(address string) error {
return emailer.sender.send(address, emailer.fromName, emailer.fromAddr, emailer.content)
func (emailer *Emailer) send(address string, email *Email) error {
return emailer.sender.send(address, emailer.fromName, emailer.fromAddr, email)
}