package security

import (
	"io/ioutil"
	"os"
	"os/exec"
	"path/filepath"
	"regexp"
	"strings"
	"testing"
)

// TestGrantVmGroupAccess verifies for the three case of a file, a directory,
// and a file in a directory that the appropriate ACEs are set, including
// inheritance in the second two examples. These are the expected ACES. Is
// verified by running icacls and comparing output.
//
// File:
// S-1-15-3-1024-2268835264-3721307629-241982045-173645152-1490879176-104643441-2915960892-1612460704:(R,W)
// S-1-5-83-1-3166535780-1122986932-343720105-43916321:(R,W)
//
// Directory:
// S-1-15-3-1024-2268835264-3721307629-241982045-173645152-1490879176-104643441-2915960892-1612460704:(OI)(CI)(R,W)
// S-1-5-83-1-3166535780-1122986932-343720105-43916321:(OI)(CI)(R,W)
//
// File in directory (inherited):
// S-1-15-3-1024-2268835264-3721307629-241982045-173645152-1490879176-104643441-2915960892-1612460704:(I)(R,W)
// S-1-5-83-1-3166535780-1122986932-343720105-43916321:(I)(R,W)

func TestGrantVmGroupAccess(t *testing.T) {
	f, err := ioutil.TempFile("", "gvmgafile")
	if err != nil {
		t.Fatal(err)
	}
	defer func() {
		f.Close()
		os.Remove(f.Name())
	}()

	d, err := ioutil.TempDir("", "gvmgadir")
	if err != nil {
		t.Fatal(err)
	}
	defer os.RemoveAll(d)

	find, err := os.Create(filepath.Join(d, "find.txt"))
	if err != nil {
		t.Fatal(err)
	}

	if err := GrantVmGroupAccess(f.Name()); err != nil {
		t.Fatal(err)
	}

	if err := GrantVmGroupAccess(d); err != nil {
		t.Fatal(err)
	}

	verifyicacls(t,
		f.Name(),
		"S-1-15-3-1024-2268835264-3721307629-241982045-173645152-1490879176-104643441-2915960892-1612460704:(R,W)",
		"S-1-5-83-1-3166535780-1122986932-343720105-43916321:(R,W)",
	)

	verifyicacls(t,
		d,
		"S-1-15-3-1024-2268835264-3721307629-241982045-173645152-1490879176-104643441-2915960892-1612460704:(OI)(CI)(R,W)",
		"S-1-5-83-1-3166535780-1122986932-343720105-43916321:(OI)(CI)(R,W)",
	)

	verifyicacls(t,
		find.Name(),
		"S-1-15-3-1024-2268835264-3721307629-241982045-173645152-1490879176-104643441-2915960892-1612460704:(I)(R,W)",
		"S-1-5-83-1-3166535780-1122986932-343720105-43916321:(I)(R,W)",
	)

}

func verifyicacls(t *testing.T, name string, ace1 string, ace2 string) {
	cmd := exec.Command("icacls", name)
	outb, err := cmd.CombinedOutput()
	if err != nil {
		t.Fatal(err)
	}
	out := string(outb)

	// Avoid () being part of match groups
	ace1 = strings.Replace(ace1, "(", "\\(", -1)
	ace1 = strings.Replace(ace1, ")", "\\)", -1)
	ace2 = strings.Replace(ace2, "(", "\\(", -1)
	ace2 = strings.Replace(ace2, ")", "\\)", -1)

	rx1 := regexp.MustCompile(ace1)
	matches1 := rx1.FindAllStringIndex(out, -1)
	if len(matches1) != 1 {
		t.Fatalf("expected one match for %s got %d", ace1, len(matches1))
	}

	rx2 := regexp.MustCompile(ace1)
	matches2 := rx2.FindAllStringIndex(out, -1)
	if len(matches2) != 1 {
		t.Fatalf("expected one match for %s got %d", ace2, len(matches2))
	}
}