feat: 0.0.1

internal/mailer/gmail.go

@@ -0,0 +1,72 @@
+package mailer
+
+import (
+	"bytes"
+	"fmt"
+	"net/smtp"
+	"text/template"
+
+	"github.com/jordan-wright/email"
+)
+
+const (
+	smtpAuthAddress   = "smtp.gmail.com"
+	smtpServerAddress = "smtp.gmail.com:587"
+)
+
+type GmailSender struct {
+	name              string
+	fromEmailAddress  string
+	fromEmailPassword string
+}
+
+func NewGmailSender(name, fromEmailAddress, fromEmailPassword string) MailSender {
+	return &GmailSender{
+		name:              name,
+		fromEmailAddress:  fromEmailAddress,
+		fromEmailPassword: fromEmailPassword,
+	}
+}
+
+func (s *GmailSender) Send(
+	mailTemplate string,
+	vars any,
+	to []string,
+	cc []string,
+	bcc []string,
+	attachFiles []string,
+) error {
+	e := email.NewEmail()
+	e.From = fmt.Sprintf("%s <%s>", s.name, s.fromEmailAddress)
+	e.To = to
+	e.Cc = cc
+	e.Bcc = bcc
+
+	tmpl, err := template.ParseFS(FS, "templates/"+mailTemplate)
+	if err != nil {
+		return fmt.Errorf("failed to parse email template: %w", err)
+	}
+
+	subject := new(bytes.Buffer)
+	if err := tmpl.ExecuteTemplate(subject, "subject", vars); err != nil {
+		return fmt.Errorf("failed to execute subject template: %w", err)
+	}
+
+	body := new(bytes.Buffer)
+	if err := tmpl.ExecuteTemplate(body, "body", vars); err != nil {
+		return fmt.Errorf("failed to execute body template: %w", err)
+	}
+
+	e.Subject = subject.String()
+	e.HTML = body.Bytes()
+
+	for _, file := range attachFiles {
+		_, err := e.AttachFile(file)
+		if err != nil {
+			return fmt.Errorf("failed to attach file %s: %w", file, err)
+		}
+	}
+
+	smtpAuth := smtp.PlainAuth("", s.fromEmailAddress, s.fromEmailPassword, smtpAuthAddress)
+	return e.Send(smtpServerAddress, smtpAuth)
+}

internal/mailer/sender.go

@@ -0,0 +1,23 @@
+// Package mailer provides functionalities for sending emails using predefined templates.
+package mailer
+
+import "embed"
+
+//go:embed "templates"
+var FS embed.FS
+
+const (
+	UserWelcomeTemplate = "user_activation.tmpl"
+	TestEmailTemplate   = "test_email.tmpl"
+)
+
+type MailSender interface {
+	Send(
+		mailTemplate string,
+		vars any,
+		to []string,
+		cc []string,
+		bcc []string,
+		attachFiles []string,
+	) error
+}

internal/mailer/sender_test.go

@@ -0,0 +1,32 @@
+package mailer
+
+import (
+	"testing"
+
+	"github.com/FernandoJVideira/simple_bank/internal/config"
+	"github.com/stretchr/testify/require"
+)
+
+func TestSendEmailWithGmail(t *testing.T) {
+	if testing.Short() {
+		t.Skip("skipping test in short mode.")
+	}
+
+	config, err := config.LoadTestConfig("../..")
+	require.NoError(t, err)
+
+	sender := NewGmailSender(config.EmailSenderName, config.EmailSender, config.EmailPassword)
+
+	vars := struct {
+		ServiceName string
+	}{
+		ServiceName: "Simple Bank",
+	}
+
+	to := []string{"[email protected]"}
+
+	attatchFiles := []string{"../README.md"}
+
+	err = sender.Send(TestEmailTemplate, vars, to, nil, nil, attatchFiles)
+	require.NoError(t, err)
+}

internal/mailer/templates/test_email.tmpl

@@ -0,0 +1,16 @@
+{{define "subject"}} Test Email From {{.ServiceName}} {{end}}
+
+{{define "body"}}
+<!doctype html>
+<html>
+  <head>
+    <meta name="viewport" content="width=device-width" />
+    <meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
+  </head>
+  <body>
+    <h1>Hello World!</h1>
+    <p>This is a test email from {{.ServiceName}}.</p>
+</body>
+</html>
+
+{{end}}

internal/mailer/templates/user_activation.tmpl

@@ -0,0 +1,22 @@
+{{define "subject"}} Finish Registration with {{.ServiceName}} {{end}}
+
+{{define "body"}}
+<!doctype html>
+<html>
+  <head>
+    <meta name="viewport" content="width=device-width" />
+    <meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
+  </head>
+  <body> <p>Hi {{.Username}},</p>
+    <p>Thanks for signing up for {{.ServiceName}}. We're excited to have you on board!</p></p>
+    <p>Before you can start using {{.ServiceName}}, you need to confirm your email address. Click the link below to confirm your email address:</p>
+    <p><a href="{{.ActivationURL}}">{{.ActivationURL}}</a></p>
+    <p>If you want to activate your account manually copy and paste the code from the link above</p>
+    <p>If you didn't sign up for {{.ServiceName}}, you can safely ignore this email.</p>
+
+    <p>Thanks,</p>
+    <p>The {{.ServiceName}} Team</p>
+  </body>
+</html>
+
+{{end}}