Implement mailer and add welcome email for POP account

.env.example

@@ -5,4 +5,11 @@ APP_LISTEN_PORT=3000
 APP_BEHIND_PROXY=false
 DATABASE_DSN="host=localhost user=camarades password=camarades dbname=camarades port=5432 sslmode=disable TimeZone=Europe/Zurich"
 SESSIONS_LOCATION=./sessions.db
-AUTHELIA_USERS_LOCATION=./users.yml
+AUTHELIA_USERS_LOCATION=./users.yml
+AUTHELIA_RESET_URL=https://login.popvaud.ch/reset-password/step1
+MAIL_HOST=mail.infomaniak.com
+MAIL_PORT=587
+MAIL_USERNAME=no-reply@popvaud.ch
+MAIL_PASSWORD=very-secure-password
+MAIL_FROM_NAME=POP Vaud
+MAIL_FROM_ADDRESS=no-reply@popvaud.ch

go.mod

@@ -1,6 +1,6 @@
 module git.readonly.ch/bouzoure/pop-camarades
 
-go 1.25.0
+go 1.25.3
 
 require (
 	github.com/alexedwards/argon2id v1.0.0
@@ -16,6 +16,7 @@ require (
 	github.com/google/uuid v1.6.0
 	github.com/pquerna/otp v1.5.0
 	github.com/sethvargo/go-password v0.3.1
+	github.com/wneessen/go-mail v0.7.2
 	github.com/yuin/goldmark v1.8.2
 	go.yaml.in/yaml/v4 v4.0.0-rc.4
 	golang.org/x/crypto v0.50.0

go.sum

@@ -222,6 +222,8 @@ github.com/valyala/bytebufferpool v1.0.0 h1:GqA5TC/0021Y/b9FG4Oi9Mr3q7XYx6Kllzaw
 github.com/valyala/bytebufferpool v1.0.0/go.mod h1:6bBcMArwyJ5K/AmCkWv1jt77kVWyCJ6HpOuEn7z0Csc=
 github.com/valyala/fasthttp v1.70.0 h1:LAhMGcWk13QZWm85+eg8ZBNbrq5mnkWFGbHMUJHIdXA=
 github.com/valyala/fasthttp v1.70.0/go.mod h1:oDZEHHkJ/Buyklg6uURmYs19442zFSnCIfX3j1FY3pE=
+github.com/wneessen/go-mail v0.7.2 h1:xxPnhZ6IZLSgxShebmZ6DPKh1b6OJcoHfzy7UjOkzS8=
+github.com/wneessen/go-mail v0.7.2/go.mod h1:+TkW6QP3EVkgTEqHtVmnAE/1MRhmzb8Y9/W3pweuS+k=
 github.com/x448/float16 v0.8.4 h1:qLwI1I70+NjRFUR3zs1JPUCgaCXSh3SW62uAKT1mSBM=
 github.com/x448/float16 v0.8.4/go.mod h1:14CWIYCyZA/cWjXOioeEpHeN/83MdbZDRQHoFcYsOfg=
 github.com/xo/terminfo v0.0.0-20220910002029-abceb7e1c41e h1:JVG44RsyaB9T2KIHavMF/ppJZNG9ZpyihvCd0w101no=

helpers/authelia/mail.go

@@ -0,0 +1,66 @@
+package authelia
+
+import (
+	ht "html/template"
+	tt "text/template"
+
+	"git.readonly.ch/bouzoure/pop-camarades/helpers"
+	"git.readonly.ch/bouzoure/pop-camarades/models"
+)
+
+type InputWelcomeMail struct {
+	Person   models.Person
+	ResetURL string
+}
+
+func SendWelcomeMail(person models.Person) error {
+	config, err := helpers.GetConfig()
+	if err != nil {
+		return err
+	}
+
+	mailer, err := helpers.GetMailer()
+	if err != nil {
+		return err
+	}
+
+	msg, err := helpers.NewMessage()
+	if err != nil {
+		return err
+	}
+
+	mailsFS, err := helpers.GetEmbeddedFS("mails")
+	if err != nil {
+		return err
+	}
+
+	inputValues := InputWelcomeMail{
+		Person:   person,
+		ResetURL: config.Authelia.ResetURL,
+	}
+
+	tplHTML, err := ht.ParseFS(mailsFS, "mails/welcome.html")
+	if err != nil {
+		return err
+	}
+
+	tplTXT, err := tt.ParseFS(mailsFS, "mails/welcome.txt")
+	if err != nil {
+		return err
+	}
+
+	msg.Subject("Ton compte POP Vaud")
+	msg.AddTo(person.Email)
+
+	err = msg.SetBodyHTMLTemplate(tplHTML, inputValues)
+	if err != nil {
+		return err
+	}
+
+	err = msg.AddAlternativeTextTemplate(tplTXT, inputValues)
+	if err != nil {
+		return err
+	}
+
+	return mailer.DialAndSend(msg)
+}

helpers/authelia/users.go

@@ -101,7 +101,10 @@ func SyncUsers() error {
 
 		account.UpdateNeeded = false
 		if !account.AccountCreated.Valid {
-			// TODO: send email
+			err := SendWelcomeMail(account.Person)
+			if err != nil {
+				log.Error(err)
+			}
 			account.AccountCreated.Scan(time.Now())
 		}
 

helpers/config.go

@@ -22,6 +22,15 @@ type Config struct {
 	}
 	Authelia struct {
 		UsersLocation string `env:"AUTHELIA_USERS_LOCATION"`
+		ResetURL      string `env:"AUTHELIA_RESET_URL"`
+	}
+	Mail struct {
+		Host        string `env:"MAIL_HOST"`
+		Port        int    `env:"MAIL_PORT"`
+		Username    string `env:"MAIL_USERNAME"`
+		Password    string `env:"MAIL_PASSWORD"`
+		FromName    string `env:"MAIL_FROM_NAME"`
+		FromAddress string `env:"MAIL_FROM_ADDRESS"`
 	}
 }
 

helpers/mailer.go

@@ -0,0 +1,49 @@
+package helpers
+
+import (
+	"github.com/wneessen/go-mail"
+)
+
+var mailer *mail.Client
+var mailerSet bool
+
+func GetMailer() (*mail.Client, error) {
+	if mailerSet {
+		return mailer, nil
+	}
+
+	config, err := GetConfig()
+	if err != nil {
+		return mailer, err
+	}
+
+	mailer, err = mail.NewClient(
+		config.Mail.Host,
+		mail.WithPort(config.Mail.Port),
+		mail.WithSMTPAuth(mail.SMTPAuthAutoDiscover),
+		mail.WithUsername(config.Mail.Username),
+		mail.WithPassword(config.Mail.Password),
+	)
+	if err != nil {
+		return mailer, err
+	}
+
+	mailerSet = true
+	return mailer, nil
+}
+
+func NewMessage() (*mail.Msg, error) {
+	msg := mail.NewMsg()
+
+	config, err := GetConfig()
+	if err != nil {
+		return msg, err
+	}
+
+	msg.FromFormat(
+		config.Mail.FromName,
+		config.Mail.FromAddress,
+	)
+
+	return msg, nil
+}

mails/welcome.html

@@ -0,0 +1,19 @@
+<!DOCTYPE html>
+<html lang="fr">
+<head>
+	<meta charset="UTF-8">
+	<meta name="viewport" content="width=device-width, initial-scale=1.0">
+</head>
+<body>
+	<h1>Ton compte POP Vaud</h1>
+	<div>
+		Camarade,<br>
+		<br>
+		Ton compte POP Vaud a été créé.<br>
+		Tu peux désormais réinitialiser ton mot de passe pour t'y connecter.<br>
+		<br>
+		Nom d'utilisateur: {{ .Person.Email }}<br>
+		Mot de passe: <a href="{{ .ResetURL }}">{{ .ResetURL }}</a>
+	</div>
+</body>
+</html>

mails/welcome.txt

@@ -0,0 +1,7 @@
+Camarade,
+
+Ton compte POP Vaud a été créé.
+Tu peux désormais réinitialiser ton mot de passe pour t'y connecter.
+
+Nom d'utilisateur: {{ .Person.Email }}
+Mot de passe: {{ .ResetURL }}

main.go

@@ -26,12 +26,16 @@ var embedStatic embed.FS
 //go:embed views
 var embedViews embed.FS
 
+//go:embed mails
+var embedMails embed.FS
+
 func main() {
 	log := helpers.GetLogger()
 
 	// Add embedded filesystems to shared state
 	helpers.AddEmbeddedFS("static", &embedStatic)
 	helpers.AddEmbeddedFS("views", &embedViews)
+	helpers.AddEmbeddedFS("mails", &embedMails)
 
 	// Fetch app config
 	config, err := helpers.GetConfig()