support reset password by email reset link

pkg/templates/template_cache.go

@@ -0,0 +1,42 @@
+package templates
+
+import (
+	"fmt"
+	"html/template"
+	"path/filepath"
+)
+
+const templateBasePath = "templates"
+const templateFileExtension = "tmpl"
+
+var templateCache = make(map[string]*CachedTemplate)
+
+// CachedTemplate represents a cached template
+type CachedTemplate struct {
+	templateName    string
+	templateContent *template.Template
+}
+
+// GetTemplate returns a cached template instance according to the template name
+func GetTemplate(templateName string) (*template.Template, error) {
+	fullPath := filepath.Join(templateBasePath, fmt.Sprintf("%s.%s", templateName, templateFileExtension))
+
+	cachedTemplate, exists := templateCache[templateName]
+
+	if exists {
+		return cachedTemplate.templateContent, nil
+	}
+
+	tmpl, err := template.ParseFiles(fullPath)
+
+	if err != nil {
+		return nil, err
+	}
+
+	templateCache[templateName] = &CachedTemplate{
+		templateName:    templateName,
+		templateContent: tmpl,
+	}
+
+	return tmpl, err
+}