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middleware.go
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middleware.go
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package auth
import (
"errors"
"fmt"
"strings"
"github.com/gofiber/fiber/v2"
)
type Middleware interface {
Handle(*fiber.Ctx) error
}
type NamedMiddleware interface {
Middleware
Name() string
}
type namedMiddlewareImpl struct {
Middleware
name string
}
func (nm *namedMiddlewareImpl) Name() string {
return nm.name
}
func namedMiddleware(name string, mw Middleware) NamedMiddleware {
return &namedMiddlewareImpl{
Middleware: mw,
name: name,
}
}
var (
authMiddlewares = make(map[string]Middleware)
ErrInvalidMiddlewareName = errors.New("invalid or empty auth middleware name")
ErrMiddlewareAlreadyExists = errors.New("auth middleware already exists")
ErrNilMiddleware = errors.New("auth middleware is nil")
ErrMiddlewareNotFound = errors.New("auth middleware not found")
)
func RegisterMiddleware(name string, m Middleware) error {
name = strings.TrimSpace(name)
if len(name) == 0 {
return ErrInvalidMiddlewareName
}
if _, ok := authMiddlewares[name]; ok {
return fmt.Errorf("%w: %s", ErrMiddlewareAlreadyExists, name)
}
if m == nil {
return ErrNilMiddleware
}
authMiddlewares[name] = m
return nil
}
func GetMiddleware(name string) (NamedMiddleware, error) {
if m, ok := authMiddlewares[name]; ok {
return namedMiddleware(name, m), nil
}
return nil, fmt.Errorf("%w: %s", ErrMiddlewareNotFound, name)
}
func ResetMiddlewares() {
authMiddlewares = make(map[string]Middleware)
}
func NamedMiddlewareAs[T Middleware](nmw NamedMiddleware) T {
return nmw.(*namedMiddlewareImpl).Middleware.(T)
}