// Copyright 2011 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.

// +build dragonfly freebsd linux nacl netbsd openbsd solaris

package x509

import "io/ioutil"

// Possible certificate files; stop after finding one.
var certFiles = []string{
	"/etc/ssl/certs/ca-certificates.crt",     // Debian/Ubuntu/Gentoo etc.
	"/etc/pki/tls/certs/ca-bundle.crt",       // Fedora/RHEL
	"/etc/ssl/ca-bundle.pem",                 // OpenSUSE
	"/etc/ssl/cert.pem",                      // OpenBSD
	"/usr/local/share/certs/ca-root-nss.crt", // FreeBSD/DragonFly
	"/etc/pki/tls/cacert.pem",                // OpenELEC
}

// Possible directories with certificate files; stop after successfully
// reading at least one file from a directory.
var certDirectories = []string{
	"/system/etc/security/cacerts", // Android

}

func (c *Certificate) systemVerify(opts *VerifyOptions) (chains [][]*Certificate, err error) {
	return nil, nil
}

func initSystemRoots() {
	roots := NewCertPool()
	for _, file := range certFiles {
		data, err := ioutil.ReadFile(file)
		if err == nil {
			roots.AppendCertsFromPEM(data)
			systemRoots = roots
			return
		}
	}

	for _, directory := range certDirectories {
		fis, err := ioutil.ReadDir(directory)
		if err != nil {
			continue
		}
		rootsAdded := false
		for _, fi := range fis {
			data, err := ioutil.ReadFile(directory + "/" + fi.Name())
			if err == nil && roots.AppendCertsFromPEM(data) {
				rootsAdded = true
			}
		}
		if rootsAdded {
			systemRoots = roots
			return
		}
	}

	// All of the files failed to load. systemRoots will be nil which will
	// trigger a specific error at verification time.
}
