package dnssec

import (
	"context"
	"strings"
	"testing"

	"github.com/coredns/coredns/plugin/file"
	"github.com/coredns/coredns/plugin/pkg/cache"
	"github.com/coredns/coredns/plugin/pkg/dnstest"
	"github.com/coredns/coredns/plugin/test"

	"github.com/miekg/dns"
)

var dnssecTestCases = []test.Case{
	{
		Qname: "miek.nl.", Qtype: dns.TypeDNSKEY,
		Answer: []dns.RR{
			test.DNSKEY("miek.nl.	3600	IN	DNSKEY	257 3 13 0J8u0XJ9GNGFEBXuAmLu04taHG4"),
		},
	},
	{
		Qname: "miek.nl.", Qtype: dns.TypeDNSKEY, Do: true,
		Answer: []dns.RR{
			test.DNSKEY("miek.nl.	3600	IN	DNSKEY	257 3 13 0J8u0XJ9GNGFEBXuAmLu04taHG4"),
			test.RRSIG("miek.nl.	3600	IN	RRSIG	DNSKEY 13 2 3600 20160503150844 20160425120844 18512 miek.nl. Iw/kNOyM"),
		},
		/* Extra: []dns.RR{test.OPT(4096, true)}, this has moved to the server and can't be test here */
	},
}

var dnsTestCases = []test.Case{
	{
		Qname: "miek.nl.", Qtype: dns.TypeDNSKEY,
		Answer: []dns.RR{
			test.DNSKEY("miek.nl.	3600	IN	DNSKEY	257 3 13 0J8u0XJ9GNGFEBXuAmLu04taHG4"),
		},
	},
	{
		Qname: "miek.nl.", Qtype: dns.TypeMX,
		Answer: []dns.RR{
			test.MX("miek.nl.	1800	IN	MX	1 aspmx.l.google.com."),
		},
		Ns: []dns.RR{
			test.NS("miek.nl.	1800	IN	NS	linode.atoom.net."),
		},
	},
	{
		Qname: "miek.nl.", Qtype: dns.TypeMX, Do: true,
		Answer: []dns.RR{
			test.MX("miek.nl.	1800	IN	MX	1 aspmx.l.google.com."),
			test.RRSIG("miek.nl.	1800	IN	RRSIG	MX 13 2 3600 20160503192428 20160425162428 18512 miek.nl. 4nxuGKitXjPVA9zP1JIUvA09"),
		},
		Ns: []dns.RR{
			test.NS("miek.nl.	1800	IN	NS	linode.atoom.net."),
			test.RRSIG("miek.nl.	1800	IN	RRSIG	NS 13 2 3600 20161217114912 20161209084912 18512 miek.nl. ad9gA8VWgF1H8ze9/0Rk2Q=="),
		},
	},
	{
		Qname: "www.miek.nl.", Qtype: dns.TypeAAAA, Do: true,
		Answer: []dns.RR{
			test.AAAA("a.miek.nl.	1800	IN	AAAA	2a01:7e00::f03c:91ff:fef1:6735"),
			test.RRSIG("a.miek.nl.	1800	IN	RRSIG	AAAA 13 3 3600 20160503193047 20160425163047 18512 miek.nl. UAyMG+gcnoXW3"),
			test.CNAME("www.miek.nl.	1800	IN	CNAME	a.miek.nl."),
			test.RRSIG("www.miek.nl.	1800	IN	RRSIG	CNAME 13 3 3600 20160503193047 20160425163047 18512 miek.nl. E3qGZn"),
		},
		Ns: []dns.RR{
			test.NS("miek.nl.	1800	IN	NS	linode.atoom.net."),
			test.RRSIG("miek.nl.	1800	IN	RRSIG	NS 13 2 3600 20161217114912 20161209084912 18512 miek.nl. ad9gA8VWgF1H8ze9/0Rk2Q=="),
		},
	},
	{
		Qname: "wwwww.miek.nl.", Qtype: dns.TypeAAAA, Do: true,
		Ns: []dns.RR{
			test.RRSIG("miek.nl.	1800	IN	RRSIG	SOA 13 2 3600 20171220135446 20171212105446 18512 miek.nl. hCRzzjYz6w=="),
			test.SOA("miek.nl.	1800	IN	SOA	linode.atoom.net. miek.miek.nl. 1282630057 14400 3600 604800 14400"),
			test.NSEC("wwwww.miek.nl.	1800	IN	NSEC	\\000.wwwww.miek.nl. A HINFO TXT LOC SRV CERT SSHFP RRSIG NSEC TLSA HIP OPENPGPKEY SPF"),
			test.RRSIG("wwwww.miek.nl.	1800	IN	RRSIG	NSEC 13 3 3600 20171220135446 20171212105446 18512 miek.nl. cVUQWs8xw=="),
		},
	},
	{
		Qname: "miek.nl.", Qtype: dns.TypeHINFO, Do: true,
		Ns: []dns.RR{
			test.NSEC("miek.nl.	1800	IN	NSEC	\\000.miek.nl. A NS SOA MX TXT AAAA LOC SRV CERT SSHFP RRSIG NSEC DNSKEY TLSA HIP OPENPGPKEY SPF"),
			test.RRSIG("miek.nl.	1800	IN	RRSIG	NSEC 13 2 3600 20171220141741 20171212111741 18512 miek.nl. GuXROL7Uu+UiPcg=="),
			test.RRSIG("miek.nl.	1800	IN	RRSIG	SOA 13 2 3600 20171220141741 20171212111741 18512 miek.nl. 8bLTReqmuQtw=="),
			test.SOA("miek.nl.	1800	IN	SOA	linode.atoom.net. miek.miek.nl. 1282630057 14400 3600 604800 14400"),
		},
	},
	{
		Qname: "www.example.org.", Qtype: dns.TypeAAAA, Do: true,
		Rcode: dns.RcodeServerFailure,
	},
}

func TestLookupZone(t *testing.T) {
	zone, err := file.Parse(strings.NewReader(dbMiekNL), "miek.nl.", "stdin", 0)
	if err != nil {
		return
	}
	fm := file.File{Next: test.ErrorHandler(), Zones: file.Zones{Z: map[string]*file.Zone{"miek.nl.": zone}, Names: []string{"miek.nl."}}}
	dnskey, rm1, rm2 := newKey(t)
	defer rm1()
	defer rm2()
	c := cache.New(defaultCap)
	dh := New([]string{"miek.nl."}, []*DNSKEY{dnskey}, false, fm, c)

	for _, tc := range dnsTestCases {
		m := tc.Msg()

		rec := dnstest.NewRecorder(&test.ResponseWriter{})
		_, err := dh.ServeDNS(context.TODO(), rec, m)
		if err != nil {
			t.Errorf("Expected no error, got %v", err)
			return
		}

		if err := test.SortAndCheck(rec.Msg, tc); err != nil {
			t.Error(err)
		}
	}
}

func TestLookupDNSKEY(t *testing.T) {
	dnskey, rm1, rm2 := newKey(t)
	defer rm1()
	defer rm2()
	c := cache.New(defaultCap)
	dh := New([]string{"miek.nl."}, []*DNSKEY{dnskey}, false, test.ErrorHandler(), c)

	for _, tc := range dnssecTestCases {
		m := tc.Msg()

		rec := dnstest.NewRecorder(&test.ResponseWriter{})
		_, err := dh.ServeDNS(context.TODO(), rec, m)
		if err != nil {
			t.Errorf("Expected no error, got %v", err)
			return
		}

		resp := rec.Msg
		if !resp.Authoritative {
			t.Errorf("Authoritative Answer should be true, got false")
		}

		if err := test.SortAndCheck(resp, tc); err != nil {
			t.Error(err)
		}

		// If there is an NSEC present in authority section check if the bitmap does not have the qtype set.
		for _, rr := range resp.Ns {
			if n, ok := rr.(*dns.NSEC); ok {
				for i := range n.TypeBitMap {
					if n.TypeBitMap[i] == tc.Qtype {
						t.Errorf("Bitmap contains qtype: %d", tc.Qtype)
					}
				}
			}
		}
	}
}

const dbMiekNL = `
$TTL    30M
$ORIGIN miek.nl.
@       IN      SOA     linode.atoom.net. miek.miek.nl. (
                             1282630057 ; Serial
                             4H         ; Refresh
                             1H         ; Retry
                             7D         ; Expire
                             4H )       ; Negative Cache TTL
                IN      NS      linode.atoom.net.

                IN      MX      1  aspmx.l.google.com.

                IN      A       139.162.196.78
                IN      AAAA    2a01:7e00::f03c:91ff:fef1:6735

a               IN      A       139.162.196.78
                IN      AAAA    2a01:7e00::f03c:91ff:fef1:6735
www             IN      CNAME   a`