prompt 4

internal/mailer/templates.go

@@ -0,0 +1,94 @@
+package mailer
+
+import (
+	"bytes"
+	htmltemplate "html/template"
+	"os"
+	"path/filepath"
+	texttemplate "text/template"
+)
+
+const defaultEmailTemplateDir = "web/emails/templates"
+
+type TemplateData struct {
+	AppName   string
+	BaseURL   string
+	VerifyURL string
+	ResetURL  string
+	UserEmail string
+}
+
+type TemplateRenderer struct {
+	templatesDir string
+}
+
+func NewTemplateRenderer(templatesDir string) *TemplateRenderer {
+	if templatesDir == "" {
+		templatesDir = defaultEmailTemplateDir
+	}
+
+	return &TemplateRenderer{templatesDir: templatesDir}
+}
+
+func (r *TemplateRenderer) RenderVerifyEmail(data TemplateData) (htmlBody string, textBody string, err error) {
+	return r.render("verify_email", data)
+}
+
+func (r *TemplateRenderer) RenderResetPassword(data TemplateData) (htmlBody string, textBody string, err error) {
+	return r.render("reset_password", data)
+}
+
+func (r *TemplateRenderer) render(baseName string, data TemplateData) (string, string, error) {
+	htmlPath := filepath.Join(r.templatesDir, baseName+".html")
+	textPath := filepath.Join(r.templatesDir, baseName+".txt")
+
+	htmlBody, err := renderHTMLFile(htmlPath, data)
+	if err != nil {
+		return "", "", err
+	}
+
+	textBody, err := renderTextFile(textPath, data)
+	if err != nil {
+		return "", "", err
+	}
+
+	return htmlBody, textBody, nil
+}
+
+func renderHTMLFile(path string, data TemplateData) (string, error) {
+	content, err := os.ReadFile(path)
+	if err != nil {
+		return "", err
+	}
+
+	tmpl, err := htmltemplate.New(filepath.Base(path)).Parse(string(content))
+	if err != nil {
+		return "", err
+	}
+
+	var buf bytes.Buffer
+	if err := tmpl.Execute(&buf, data); err != nil {
+		return "", err
+	}
+
+	return buf.String(), nil
+}
+
+func renderTextFile(path string, data TemplateData) (string, error) {
+	content, err := os.ReadFile(path)
+	if err != nil {
+		return "", err
+	}
+
+	tmpl, err := texttemplate.New(filepath.Base(path)).Parse(string(content))
+	if err != nil {
+		return "", err
+	}
+
+	var buf bytes.Buffer
+	if err := tmpl.Execute(&buf, data); err != nil {
+		return "", err
+	}
+
+	return buf.String(), nil
+}