chore: smtp template

pkg/smtpclient/smtpclient.go

@@ -1,12 +1,61 @@
 package smtpclient
 
-import "errors"
+import (
+	"bytes"
+	"embed"
+	"errors"
+	"fmt"
+	"html/template"
+	"strings"
+)
 
 type SMTPClient struct{}
 
+//go:embed template/*
+var templates embed.FS
+
 func (s SMTPClient) SendMail(templateName string, to string, data any) error {
 	if to == "error@error.error" {
 		return errors.New("error mail send")
 	}
 	return nil
 }
+
+func NewDummySMTPClient() SMTPClient {
+	s := SMTPClient{}
+	return s
+}
+
+func (s SMTPClient) renderTemplates(templateName string, data any) (string, string, string, error) {
+	subject, err := s.renderFile(fmt.Sprintf("%v.subject", templateName), data)
+	if err != nil {
+		return "", "", "", err
+	}
+	txt, err := s.renderFile(fmt.Sprintf("%v.txt", templateName), data)
+	if err != nil {
+		return "", "", "", err
+	}
+
+	html, err := s.renderFile(fmt.Sprintf("%v.html", templateName), data)
+	if err != nil {
+		return "", "", "", err
+	}
+
+	return subject, txt, html, nil
+}
+
+func (s SMTPClient) renderFile(filename string, data any) (string, error) {
+	tmpl, err := template.ParseFS(templates, "template/"+filename)
+	if err != nil {
+		return "", err
+	}
+
+	var buf bytes.Buffer
+	err = tmpl.Execute(&buf, data)
+	if err != nil {
+		return "", err
+	}
+
+	renderedString := buf.String()
+	return strings.Trim(renderedString, "\n"), nil
+}

pkg/smtpclient/smtpclient_test.go

@@ -0,0 +1,29 @@
+package smtpclient
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+)
+
+func TestRenderFile(t *testing.T) {
+	smtp := NewDummySMTPClient()
+	subject, err := smtp.renderFile("register.subject", nil)
+
+	assert.Nil(t, err)
+	assert.Equal(t, "Bestätige deine E-Mail Adresse", subject)
+}
+
+func TestRenderTemplate(t *testing.T) {
+	smtp := NewDummySMTPClient()
+
+	subject, txt, html, err := smtp.renderTemplates("register", map[string]string{"Name": "Test Account Service", "Link": "http://www.google.de"})
+	assert.Nil(t, err)
+	assert.Equal(t, "Bestätige deine E-Mail Adresse", subject)
+	assert.Equal(t, "Hallo,\n\num deinen Account auf Test Account Service zu aktivieren klicke auf folgenden Link http://www.google.de.\n\nViele Grüße,", txt)
+	htmlContent := `Hello, <br><br>
+to activate your Acount at Test Account Service please click <a href="http://www.google.de">this link.</a>
+<br><br>
+Best regards,<br>`
+	assert.Equal(t, htmlContent, html)
+}

pkg/smtpclient/template/register.html

@@ -0,0 +1,5 @@
+Hello, <br><br>
+to activate your Acount at {{ .Name }} please click <a href="{{ .Link }}">this link.</a>
+<br><br>
+Best regards,<br>
+

pkg/smtpclient/template/register.subject

@@ -0,0 +1 @@
+Bestätige deine E-Mail Adresse

pkg/smtpclient/template/register.txt

@@ -0,0 +1,5 @@
+Hallo,
+
+um deinen Account auf {{ .Name }} zu aktivieren klicke auf folgenden Link {{ .Link }}.
+
+Viele Grüße,