✨ feat: add Delete method to Store struct in session middleware (#2655)

* ✨ feat: add Delete method to Store struct in session middleware

* ♻ refactor: enhance Delete method and test cases in session middleware

docs/api/middleware/session.md

@@ -16,6 +16,7 @@ This middleware uses our [Storage](https://github.com/gofiber/storage) package t
 func New(config ...Config) *Store
 func (s *Store) RegisterType(i interface{})
 func (s *Store) Get(c *fiber.Ctx) (*Session, error)
+func (s *Store) Delete(id string) error
 func (s *Store) Reset() error
 
 func (s *Session) Get(key string) interface{}

middleware/session/store.go

@@ -2,6 +2,7 @@ package session
 
 import (
 	"encoding/gob"
+	"errors"
 	"fmt"
 	"sync"
 
@@ -12,6 +13,9 @@ import (
 	"github.com/valyala/fasthttp"
 )
 
+// ErrEmptySessionID is an error that occurs when the session ID is empty.
+var ErrEmptySessionID = errors.New("session id cannot be empty")
+
 type Store struct {
 	Config
 }
@@ -140,3 +144,11 @@ func (s *Store) responseCookies(c *fiber.Ctx) (string, error) {
 func (s *Store) Reset() error {
 	return s.Storage.Reset()
 }
+
+// Delete deletes a session by its id.
+func (s *Store) Delete(id string) error {
+	if id == "" {
+		return ErrEmptySessionID
+	}
+	return s.Storage.Delete(id)
+}

middleware/session/store_test.go

@@ -85,3 +85,34 @@ func TestStore_Get(t *testing.T) {
 		utils.AssertEqual(t, unexpectedID, acquiredSession.ID())
 	})
 }
+
+// go test -run TestStore_DeleteSession
+func TestStore_DeleteSession(t *testing.T) {
+	t.Parallel()
+	// fiber instance
+	app := fiber.New()
+	// session store
+	store := New()
+
+	// fiber context
+	ctx := app.AcquireCtx(&fasthttp.RequestCtx{})
+	defer app.ReleaseCtx(ctx)
+
+	// Create a new session
+	session, err := store.Get(ctx)
+	utils.AssertEqual(t, err, nil)
+
+	// Save the session ID
+	sessionID := session.ID()
+
+	// Delete the session
+	err = store.Delete(sessionID)
+	utils.AssertEqual(t, err, nil)
+
+	// Try to get the session again
+	session, err = store.Get(ctx)
+	utils.AssertEqual(t, err, nil)
+
+	// The session ID should be different now, because the old session was deleted
+	utils.AssertEqual(t, session.ID() == sessionID, false)
+}