// Copyright 2019 Drone.IO Inc. All rights reserved.
// Use of this source code is governed by the Drone Non-Commercial License
// that can be found in the LICENSE file.

package acl

import (
	"net/http"

	"github.com/drone/drone/handler/api/errors"
	"github.com/drone/drone/handler/api/render"
	"github.com/drone/drone/handler/api/request"
	"github.com/drone/drone/logger"
)

// AuthorizeUser returns an http.Handler middleware that authorizes only
// authenticated users to proceed to the next handler in the chain. Guest users
// are rejected with a 401 unauthorized error.
func AuthorizeUser(next http.Handler) http.Handler {
	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		_, ok := request.UserFrom(r.Context())
		if !ok {
			render.Unauthorized(w, errors.ErrUnauthorized)
			logger.FromRequest(r).
				Debugln("api: authentication required")
		} else {
			next.ServeHTTP(w, r)
		}
	})
}

// AuthorizeAdmin returns an http.Handler middleware that authorizes only
// system administrators to proceed to the next handler in the chain.
func AuthorizeAdmin(next http.Handler) http.Handler {
	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		user, ok := request.UserFrom(r.Context())
		if !ok {
			render.Unauthorized(w, errors.ErrUnauthorized)
			logger.FromRequest(r).
				Debugln("api: authentication required")
		} else if !user.Admin {
			render.Forbidden(w, errors.ErrForbidden)
			logger.FromRequest(r).
				Debugln("api: administrative access required")
		} else {
			next.ServeHTTP(w, r)
		}
	})
}