Encrypt Cookie

Encrypt middleware for Fiber which encrypts cookie values. Note: this middleware does not encrypt cookie names.

Signatures

// Intitializes the middleware
func New(config ...Config) fiber.Handler

// Returns a random 32 character long string
func GenerateKey() string

Examples

Import the middleware package that is part of the Fiber web framework

import (
  "github.com/gofiber/fiber/v2"
  "github.com/gofiber/fiber/v2/middleware/encryptcookie"
)

After you initiate your Fiber app, you can use the following possibilities:

// Provide a minimal config
// `Key` must be a 32 character string. It's used to encrypt the values, so make sure it is random and keep it secret.
// You can run `openssl rand -base64 32` or call `encryptcookie.GenerateKey()` to create a random key for you.
// Make sure not to set `Key` to `encryptcookie.GenerateKey()` because that will create a new key every run.
app.Use(encryptcookie.New(encryptcookie.Config{
    Key: "secret-thirty-2-character-string",
}))

// Get / reading out the encrypted cookie
app.Get("/", func(c *fiber.Ctx) error {
    return c.SendString("value=" + c.Cookies("test"))
})

// Post / create the encrypted cookie
app.Post("/", func(c *fiber.Ctx) error {
    c.Cookie(&fiber.Cookie{
        Name:  "test",
        Value: "SomeThing",
    })
    return nil
})

Config

// Config defines the config for middleware.
type Config struct {
    // Next defines a function to skip this middleware when returned true.
    //
    // Optional. Default: nil
    Next func(c *fiber.Ctx) bool

    // Array of cookie keys that should not be encrypted.
    //
    // Optional. Default: ["csrf_"]
    Except []string

    // Base64 encoded unique key to encode & decode cookies.
    //
    // Required. The key should be 32 bytes of random data in base64-encoded form.
    // You may run `openssl rand -base64 32` or use `encryptcookie.GenerateKey()` to generate a new key.
    Key string

    // Custom function to encrypt cookies.
    //
    // Optional. Default: EncryptCookie
    Encryptor func(decryptedString, key string) (string, error)

    // Custom function to decrypt cookies.
    //
    // Optional. Default: DecryptCookie
    Decryptor func(encryptedString, key string) (string, error)
}

Default Config

var ConfigDefault = Config{
    Next:      nil,
    Except:    []string{"csrf_"},
    Key:       "",
    Encryptor: EncryptCookie,
    Decryptor: DecryptCookie,
}

Usage of CSRF and Encryptcookie Middlewares with Custom Cookie Names

Normally, encryptcookie middleware skips csrf_ cookies. However, it won't work when you use custom cookie names for CSRF. You should update Except config to avoid this problem. For example:

app.Use(encryptcookie.New(encryptcookie.Config{
    Key: "secret-thirty-2-character-string",
    Except: []string{"csrf_1"}, // exclude CSRF cookie
}))
app.Use(csrf.New(csrf.Config{
    KeyLookup:      "form:test",
    CookieName:     "csrf_1", 
    CookieHTTPOnly: true,
}))