72 lines
2.2 KiB
Go
72 lines
2.2 KiB
Go
package auth
|
|
|
|
import (
|
|
"context"
|
|
"net/http"
|
|
"net/url"
|
|
|
|
"github.com/FAU-CDI/wisski-distillery/pkg/httpx"
|
|
)
|
|
|
|
// Permission represents a permission for a user
|
|
//
|
|
// The nil permission represents any authenticated user.
|
|
type Permission func(user *AuthUser, r *http.Request) (ok bool, err error)
|
|
|
|
// Protect returns a new handler which requires a user to be logged in and pass the perm function.
|
|
//
|
|
// If an unauthenticated user attempts to access the returned handler, they are redirected to the login endpoint.
|
|
// If an authenticated user is missing permissions, a Forbidden response is called.
|
|
// If an authenticated calls the endpoint, and they have the given permissions, the original handler is called.
|
|
func (auth *Auth) Protect(handler http.Handler, perm Permission) http.Handler {
|
|
return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
|
|
// load the user in the session
|
|
user, err := auth.UserOf(r)
|
|
if err != nil {
|
|
goto err
|
|
}
|
|
|
|
// if there is no user in the session
|
|
// we need to login the user
|
|
if user == nil {
|
|
// we can't redirect anything other than GET
|
|
// (because it might be a form)
|
|
// => so we just return a forbidden
|
|
if r.Method != http.MethodGet {
|
|
goto forbidden
|
|
}
|
|
|
|
// redirect the user to the login endpoint, with the original URI as a return
|
|
dest := "/auth/login?next=" + url.QueryEscape(r.URL.RequestURI())
|
|
http.Redirect(w, r, dest, http.StatusSeeOther)
|
|
return
|
|
}
|
|
|
|
// if we have a permission check, we need to call it
|
|
// to find out if the user is actually allowed to access the page
|
|
if perm != nil {
|
|
ok, err := perm(user, r)
|
|
if err != nil {
|
|
goto err
|
|
}
|
|
if !ok {
|
|
goto forbidden
|
|
}
|
|
}
|
|
|
|
// store the user into the session
|
|
r = r.WithContext(context.WithValue(r.Context(), ctxUserKey, user))
|
|
handler.ServeHTTP(w, r)
|
|
return
|
|
forbidden:
|
|
httpx.HTMLInterceptor.Intercept(w, r, httpx.ErrForbidden)
|
|
return
|
|
err:
|
|
httpx.HTMLInterceptor.Fallback.ServeHTTP(w, r)
|
|
})
|
|
}
|
|
|
|
// Admin represents a permission that checks if a user is an administrator and has totp enabled.
|
|
var Admin Permission = func(user *AuthUser, r *http.Request) (ok bool, err error) {
|
|
return user != nil && user.Admin && user.TOTPEnabled, nil
|
|
}
|