🧽 clean code structure

middleware/csrf/csrf.go

@@ -49,29 +49,29 @@ func New(config ...Config) fiber.Handler {
 	dummyVal := []byte{'+'}
 
 	// Return new handler
-	return func(c *fiber.Ctx) error {
+	return func(c *fiber.Ctx) (err error) {
 		// Don't execute middleware if Next returns true
 		if cfg.Next != nil && cfg.Next(c) {
 			return c.Next()
 		}
 
+		var token string
+
 		// Action depends on the HTTP method
 		switch c.Method() {
 		case fiber.MethodGet:
 			// Generate CSRF token if not exist
 
 			// Declare empty token and try to get existing CSRF from cookie
-			token, key := "", c.Cookies(cfg.Cookie.Name)
+			token = c.Cookies(cfg.Cookie.Name)
 
 			// Do we have an existing CSRF token?
-			if key != "" {
-				token = key
-			} else {
+			if token == "" {
 				// Generate new CSRF token
 				token = cfg.KeyGenerator()
 
 				// Add token to Storage
-				if err := cfg.Storage.Set(token, dummyVal, cfg.Expiration); err != nil {
+				if err = cfg.Storage.Set(token, dummyVal, cfg.Expiration); err != nil {
 					fmt.Println("[CSRF]", err.Error())
 				}
 			}
@@ -90,27 +90,17 @@ func New(config ...Config) fiber.Handler {
 
 			// Set cookie to response
 			c.Cookie(cookie)
-
-			// Protect clients from caching the response by telling the browser
-			// a new header value is generated
-			c.Vary(fiber.HeaderCookie)
-
-			// Store token in context if set
-			if cfg.ContextKey != "" {
-				c.Locals(cfg.ContextKey, token)
-			}
-
 		case fiber.MethodPost, fiber.MethodDelete, fiber.MethodPatch, fiber.MethodPut:
 			// Verify CSRF token
 			// Extract token from client request i.e. header, query, param, form or cookie
-			csrf, err := extractor(c)
+			token, err = extractor(c)
 			if err != nil {
 				return fiber.ErrForbidden
 			}
 			// We have a problem extracting the csrf token from Storage
-			if _, err = cfg.Storage.Get(csrf); err != nil {
+			if _, err = cfg.Storage.Get(token); err != nil {
 				// The token is invalid, let client generate a new one
-				if err = cfg.Storage.Delete(csrf); err != nil {
+				if err = cfg.Storage.Delete(token); err != nil {
 					fmt.Println("[CSRF]", err.Error())
 				}
 				// Expire cookie
@@ -127,6 +117,15 @@ func New(config ...Config) fiber.Handler {
 			}
 		}
 
+		// Protect clients from caching the response by telling the browser
+		// a new header value is generated
+		c.Vary(fiber.HeaderCookie)
+
+		// Store token in context if set
+		if cfg.ContextKey != "" {
+			c.Locals(cfg.ContextKey, token)
+		}
+
 		// Continue stack
 		return c.Next()
 	}