httpserver/auth/auth.go

package auth

import (
	"net/http"

	"github.com/gin-gonic/gin"
	"go.sebtobie.de/httpserver/constants"
)

// AuthenticationHandler is an interface that is used to give the account of the request.
// it is set into the context using gin.Context.Set.
// The context  must be reused for the redirect.
// Account NEVER returns nil.
// Not loggedin Users have return Anonymous() = true and get() = nil and List() = []string{}
type AuthenticationHandler interface {
	Account(*gin.Context) Account
}

// Account is an interface that gives the application access to infos about the user.
type Account interface {
	Get(constants.AccountConstant) any
	List() []constants.AccountConstant
	Anonymous() bool
	Redirect(c *gin.Context)
}

// AnonAccountHandler is an simple struct that fullfills the AuthenticationHandler Interface
type AnonAccountHandler struct{}

// Account is an simple method that returns an Account that is always anonymous.
func (*AnonAccountHandler) Account(*gin.Context) Account {
	return &AnonAccount{}
}

// AnonAccount is an simple Account-interface implementation.
// It is always Anonymous
type AnonAccount struct{}

// Get returns only AccountAnon = true
func (*AnonAccount) Get(key constants.AccountConstant) (in any) {
	if key == constants.AccountAnon {
		return true
	}
	return
}

// List return only AccountAnon as the only Listitem
func (*AnonAccount) List() []constants.AccountConstant {
	return []constants.AccountConstant{constants.AccountAnon}
}

// Anonymous is always true
func (*AnonAccount) Anonymous() bool {
	return true
}

// Redirect should point to an login, but since its not possible for this handler it sends an 401 Page
func (*AnonAccount) Redirect(c *gin.Context) {
	c.AbortWithStatus(http.StatusForbidden)
}