91 lines
2.8 KiB
Go
91 lines
2.8 KiB
Go
package auth
|
|
|
|
import (
|
|
"context"
|
|
"net/http"
|
|
"net/url"
|
|
|
|
"github.com/FAU-CDI/wisski-distillery/pkg/httpx"
|
|
)
|
|
|
|
// 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) {
|
|
var grant Grant
|
|
|
|
// load the user in the session
|
|
user, err := auth.UserOf(r)
|
|
if err != nil {
|
|
goto err
|
|
}
|
|
|
|
// if there is no user in the session, they need to login first!
|
|
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
|
|
}
|
|
|
|
{
|
|
var err error
|
|
// call the permission check
|
|
grant, err = perm.Permit(user, r)
|
|
if err != nil {
|
|
goto err
|
|
}
|
|
if !grant.Granted() {
|
|
goto forbidden
|
|
}
|
|
}
|
|
|
|
// store the user into the session, and then return the new session
|
|
r = r.WithContext(context.WithValue(r.Context(), ctxUserKey, user))
|
|
handler.ServeHTTP(w, r)
|
|
return
|
|
forbidden:
|
|
{
|
|
message := "Forbidden"
|
|
if grant != nil {
|
|
message = grant.Denied()
|
|
}
|
|
httpx.Response{
|
|
ContentType: "text/plain",
|
|
StatusCode: http.StatusForbidden,
|
|
Body: []byte(message),
|
|
}.ServeHTTP(w, r)
|
|
return
|
|
}
|
|
err:
|
|
httpx.TextInterceptor.Fallback.ServeHTTP(w, r)
|
|
})
|
|
}
|
|
|
|
// Require returns a slice containing one decorator that acts like Protect(perm) on every request.
|
|
// It returns
|
|
func (auth *Auth) Require(perm Permission) func(http.Handler) http.Handler {
|
|
return func(h http.Handler) http.Handler {
|
|
return auth.Protect(h, perm)
|
|
}
|
|
}
|
|
|
|
// 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 Grant, err error) {
|
|
return Bool2Grant(user != nil && user.IsAdmin() && user.IsTOTPEnabled(), "user needs to have admin permissions and passcode enabled"), nil
|
|
}
|
|
|
|
// User represents a permission that checks if a user has totp enabled.
|
|
var User Permission = func(user *AuthUser, r *http.Request) (ok Grant, err error) {
|
|
return Bool2Grant(user != nil && user.IsEnabled() && user.IsTOTPEnabled(), "user needs to have passcode enabled"), nil
|
|
}
|