// Copyright 2010 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.

package http

import (
	"encoding/json"
	"errors"
	"fmt"
	"log"
	"os"
	"reflect"
	"slices"
	"strings"
	"testing"
	"time"
)

var writeSetCookiesTests = []struct {
	Cookie *Cookie
	Raw    string
}{
	{
		&Cookie{Name: "cookie-1", Value: "v$1"},
		"cookie-1=v$1",
	},
	{
		&Cookie{Name: "cookie-2", Value: "two", MaxAge: 3600},
		"cookie-2=two; Max-Age=3600",
	},
	{
		&Cookie{Name: "cookie-3", Value: "three", Domain: ".example.com"},
		"cookie-3=three; Domain=example.com",
	},
	{
		&Cookie{Name: "cookie-4", Value: "four", Path: "/restricted/"},
		"cookie-4=four; Path=/restricted/",
	},
	{
		&Cookie{Name: "cookie-5", Value: "five", Domain: "wrong;bad.abc"},
		"cookie-5=five",
	},
	{
		&Cookie{Name: "cookie-6", Value: "six", Domain: "bad-.abc"},
		"cookie-6=six",
	},
	{
		&Cookie{Name: "cookie-7", Value: "seven", Domain: "127.0.0.1"},
		"cookie-7=seven; Domain=127.0.0.1",
	},
	{
		&Cookie{Name: "cookie-8", Value: "eight", Domain: "::1"},
		"cookie-8=eight",
	},
	{
		&Cookie{Name: "cookie-9", Value: "expiring", Expires: time.Unix(1257894000, 0)},
		"cookie-9=expiring; Expires=Tue, 10 Nov 2009 23:00:00 GMT",
	},
	// According to IETF 6265 Section 5.1.1.5, the year cannot be less than 1601
	{
		&Cookie{Name: "cookie-10", Value: "expiring-1601", Expires: time.Date(1601, 1, 1, 1, 1, 1, 1, time.UTC)},
		"cookie-10=expiring-1601; Expires=Mon, 01 Jan 1601 01:01:01 GMT",
	},
	{
		&Cookie{Name: "cookie-11", Value: "invalid-expiry", Expires: time.Date(1600, 1, 1, 1, 1, 1, 1, time.UTC)},
		"cookie-11=invalid-expiry",
	},
	{
		&Cookie{Name: "cookie-12", Value: "samesite-default", SameSite: SameSiteDefaultMode},
		"cookie-12=samesite-default",
	},
	{
		&Cookie{Name: "cookie-13", Value: "samesite-lax", SameSite: SameSiteLaxMode},
		"cookie-13=samesite-lax; SameSite=Lax",
	},
	{
		&Cookie{Name: "cookie-14", Value: "samesite-strict", SameSite: SameSiteStrictMode},
		"cookie-14=samesite-strict; SameSite=Strict",
	},
	{
		&Cookie{Name: "cookie-15", Value: "samesite-none", SameSite: SameSiteNoneMode},
		"cookie-15=samesite-none; SameSite=None",
	},
	{
		&Cookie{Name: "cookie-16", Value: "partitioned", SameSite: SameSiteNoneMode, Secure: true, Path: "/", Partitioned: true},
		"cookie-16=partitioned; Path=/; Secure; SameSite=None; Partitioned",
	},
	// The "special" cookies have values containing commas or spaces which
	// are disallowed by RFC 6265 but are common in the wild.
	{
		&Cookie{Name: "special-1", Value: "a z"},
		`special-1="a z"`,
	},
	{
		&Cookie{Name: "special-2", Value: " z"},
		`special-2=" z"`,
	},
	{
		&Cookie{Name: "special-3", Value: "a "},
		`special-3="a "`,
	},
	{
		&Cookie{Name: "special-4", Value: " "},
		`special-4=" "`,
	},
	{
		&Cookie{Name: "special-5", Value: "a,z"},
		`special-5="a,z"`,
	},
	{
		&Cookie{Name: "special-6", Value: ",z"},
		`special-6=",z"`,
	},
	{
		&Cookie{Name: "special-7", Value: "a,"},
		`special-7="a,"`,
	},
	{
		&Cookie{Name: "special-8", Value: ","},
		`special-8=","`,
	},
	{
		&Cookie{Name: "empty-value", Value: ""},
		`empty-value=`,
	},
	{
		nil,
		``,
	},
	{
		&Cookie{Name: ""},
		``,
	},
	{
		&Cookie{Name: "\t"},
		``,
	},
	{
		&Cookie{Name: "\r"},
		``,
	},
	{
		&Cookie{Name: "a\nb", Value: "v"},
		``,
	},
	{
		&Cookie{Name: "a\nb", Value: "v"},
		``,
	},
	{
		&Cookie{Name: "a\rb", Value: "v"},
		``,
	},
	// Quoted values (issue #46443)
	{
		&Cookie{Name: "cookie", Value: "quoted", Quoted: true},
		`cookie="quoted"`,
	},
	{
		&Cookie{Name: "cookie", Value: "quoted with spaces", Quoted: true},
		`cookie="quoted with spaces"`,
	},
	{
		&Cookie{Name: "cookie", Value: "quoted,with,commas", Quoted: true},
		`cookie="quoted,with,commas"`,
	},
}

func TestWriteSetCookies(t *testing.T) {
	defer log.SetOutput(os.Stderr)
	var logbuf strings.Builder
	log.SetOutput(&logbuf)

	for i, tt := range writeSetCookiesTests {
		if g, e := tt.Cookie.String(), tt.Raw; g != e {
			t.Errorf("Test %d, expecting:\n%s\nGot:\n%s\n", i, e, g)
		}
	}

	if got, sub := logbuf.String(), "dropping domain attribute"; !strings.Contains(got, sub) {
		t.Errorf("Expected substring %q in log output. Got:\n%s", sub, got)
	}
}

type headerOnlyResponseWriter Header

func (ho headerOnlyResponseWriter) Header() Header {
	return Header(ho)
}

func (ho headerOnlyResponseWriter) Write([]byte) (int, error) {
	panic("NOIMPL")
}

func (ho headerOnlyResponseWriter) WriteHeader(int) {
	panic("NOIMPL")
}

func TestSetCookie(t *testing.T) {
	m := make(Header)
	SetCookie(headerOnlyResponseWriter(m), &Cookie{Name: "cookie-1", Value: "one", Path: "/restricted/"})
	SetCookie(headerOnlyResponseWriter(m), &Cookie{Name: "cookie-2", Value: "two", MaxAge: 3600})
	if l := len(m["Set-Cookie"]); l != 2 {
		t.Fatalf("expected %d cookies, got %d", 2, l)
	}
	if g, e := m["Set-Cookie"][0], "cookie-1=one; Path=/restricted/"; g != e {
		t.Errorf("cookie #1: want %q, got %q", e, g)
	}
	if g, e := m["Set-Cookie"][1], "cookie-2=two; Max-Age=3600"; g != e {
		t.Errorf("cookie #2: want %q, got %q", e, g)
	}
}

var addCookieTests = []struct {
	Cookies []*Cookie
	Raw     string
}{
	{
		[]*Cookie{},
		"",
	},
	{
		[]*Cookie{{Name: "cookie-1", Value: "v$1"}},
		"cookie-1=v$1",
	},
	{
		[]*Cookie{
			{Name: "cookie-1", Value: "v$1"},
			{Name: "cookie-2", Value: "v$2"},
			{Name: "cookie-3", Value: "v$3"},
		},
		"cookie-1=v$1; cookie-2=v$2; cookie-3=v$3",
	},
	// Quoted values (issue #46443)
	{
		[]*Cookie{
			{Name: "cookie-1", Value: "quoted", Quoted: true},
			{Name: "cookie-2", Value: "quoted with spaces", Quoted: true},
			{Name: "cookie-3", Value: "quoted,with,commas", Quoted: true},
		},
		`cookie-1="quoted"; cookie-2="quoted with spaces"; cookie-3="quoted,with,commas"`,
	},
}

func TestAddCookie(t *testing.T) {
	for i, tt := range addCookieTests {
		req, _ := NewRequest("GET", "http://example.com/", nil)
		for _, c := range tt.Cookies {
			req.AddCookie(c)
		}
		if g := req.Header.Get("Cookie"); g != tt.Raw {
			t.Errorf("Test %d:\nwant: %s\n got: %s\n", i, tt.Raw, g)
		}
	}
}

var readSetCookiesTests = []struct {
	header  Header
	cookies []*Cookie
	godebug string
}{
	{
		header:  Header{"Set-Cookie": {"Cookie-1=v$1"}},
		cookies: []*Cookie{{Name: "Cookie-1", Value: "v$1", Raw: "Cookie-1=v$1"}},
	},
	{
		header: Header{"Set-Cookie": {"NID=99=YsDT5i3E-CXax-; expires=Wed, 23-Nov-2011 01:05:03 GMT; path=/; domain=.google.ch; HttpOnly"}},
		cookies: []*Cookie{{
			Name:       "NID",
			Value:      "99=YsDT5i3E-CXax-",
			Path:       "/",
			Domain:     ".google.ch",
			HttpOnly:   true,
			Expires:    time.Date(2011, 11, 23, 1, 5, 3, 0, time.UTC),
			RawExpires: "Wed, 23-Nov-2011 01:05:03 GMT",
			Raw:        "NID=99=YsDT5i3E-CXax-; expires=Wed, 23-Nov-2011 01:05:03 GMT; path=/; domain=.google.ch; HttpOnly",
		}},
	},
	{
		header: Header{"Set-Cookie": {".ASPXAUTH=7E3AA; expires=Wed, 07-Mar-2012 14:25:06 GMT; path=/; HttpOnly"}},
		cookies: []*Cookie{{
			Name:       ".ASPXAUTH",
			Value:      "7E3AA",
			Path:       "/",
			Expires:    time.Date(2012, 3, 7, 14, 25, 6, 0, time.UTC),
			RawExpires: "Wed, 07-Mar-2012 14:25:06 GMT",
			HttpOnly:   true,
			Raw:        ".ASPXAUTH=7E3AA; expires=Wed, 07-Mar-2012 14:25:06 GMT; path=/; HttpOnly",
		}},
	},
	{
		header: Header{"Set-Cookie": {"ASP.NET_SessionId=foo; path=/; HttpOnly"}},
		cookies: []*Cookie{{
			Name:     "ASP.NET_SessionId",
			Value:    "foo",
			Path:     "/",
			HttpOnly: true,
			Raw:      "ASP.NET_SessionId=foo; path=/; HttpOnly",
		}},
	},
	{
		header: Header{"Set-Cookie": {"samesitedefault=foo; SameSite"}},
		cookies: []*Cookie{{
			Name:     "samesitedefault",
			Value:    "foo",
			SameSite: SameSiteDefaultMode,
			Raw:      "samesitedefault=foo; SameSite",
		}},
	},
	{
		header: Header{"Set-Cookie": {"samesiteinvalidisdefault=foo; SameSite=invalid"}},
		cookies: []*Cookie{{
			Name:     "samesiteinvalidisdefault",
			Value:    "foo",
			SameSite: SameSiteDefaultMode,
			Raw:      "samesiteinvalidisdefault=foo; SameSite=invalid",
		}},
	},
	{
		header: Header{"Set-Cookie": {"samesitelax=foo; SameSite=Lax"}},
		cookies: []*Cookie{{
			Name:     "samesitelax",
			Value:    "foo",
			SameSite: SameSiteLaxMode,
			Raw:      "samesitelax=foo; SameSite=Lax",
		}},
	},
	{
		header: Header{"Set-Cookie": {"samesitestrict=foo; SameSite=Strict"}},
		cookies: []*Cookie{{
			Name:     "samesitestrict",
			Value:    "foo",
			SameSite: SameSiteStrictMode,
			Raw:      "samesitestrict=foo; SameSite=Strict",
		}},
	},
	{
		header: Header{"Set-Cookie": {"samesitenone=foo; SameSite=None"}},
		cookies: []*Cookie{{
			Name:     "samesitenone",
			Value:    "foo",
			SameSite: SameSiteNoneMode,
			Raw:      "samesitenone=foo; SameSite=None",
		}},
	},
	// Make sure we can properly read back the Set-Cookie headers we create
	// for values containing spaces or commas:
	{
		header:  Header{"Set-Cookie": {`special-1=a z`}},
		cookies: []*Cookie{{Name: "special-1", Value: "a z", Raw: `special-1=a z`}},
	},
	{
		header:  Header{"Set-Cookie": {`special-2=" z"`}},
		cookies: []*Cookie{{Name: "special-2", Value: " z", Quoted: true, Raw: `special-2=" z"`}},
	},
	{
		header:  Header{"Set-Cookie": {`special-3="a "`}},
		cookies: []*Cookie{{Name: "special-3", Value: "a ", Quoted: true, Raw: `special-3="a "`}},
	},
	{
		header:  Header{"Set-Cookie": {`special-4=" "`}},
		cookies: []*Cookie{{Name: "special-4", Value: " ", Quoted: true, Raw: `special-4=" "`}},
	},
	{
		header:  Header{"Set-Cookie": {`special-5=a,z`}},
		cookies: []*Cookie{{Name: "special-5", Value: "a,z", Raw: `special-5=a,z`}},
	},
	{
		header:  Header{"Set-Cookie": {`special-6=",z"`}},
		cookies: []*Cookie{{Name: "special-6", Value: ",z", Quoted: true, Raw: `special-6=",z"`}},
	},
	{
		header:  Header{"Set-Cookie": {`special-7=a,`}},
		cookies: []*Cookie{{Name: "special-7", Value: "a,", Raw: `special-7=a,`}},
	},
	{
		header:  Header{"Set-Cookie": {`special-8=","`}},
		cookies: []*Cookie{{Name: "special-8", Value: ",", Quoted: true, Raw: `special-8=","`}},
	},
	// Make sure we can properly read back the Set-Cookie headers
	// for names containing spaces:
	{
		header:  Header{"Set-Cookie": {`special-9 =","`}},
		cookies: []*Cookie{{Name: "special-9", Value: ",", Quoted: true, Raw: `special-9 =","`}},
	},
	// Quoted values (issue #46443)
	{
		header:  Header{"Set-Cookie": {`cookie="quoted"`}},
		cookies: []*Cookie{{Name: "cookie", Value: "quoted", Quoted: true, Raw: `cookie="quoted"`}},
	},
	{
		header:  Header{"Set-Cookie": slices.Repeat([]string{"a="}, defaultCookieMaxNum+1)},
		cookies: []*Cookie{},
	},
	{
		header:  Header{"Set-Cookie": slices.Repeat([]string{"a="}, 10)},
		cookies: []*Cookie{},
		godebug: "httpcookiemaxnum=5",
	},
	{
		header:  Header{"Set-Cookie": strings.Split(strings.Repeat(";a=", defaultCookieMaxNum+1)[1:], ";")},
		cookies: slices.Repeat([]*Cookie{{Name: "a", Value: "", Quoted: false, Raw: "a="}}, defaultCookieMaxNum+1),
		godebug: "httpcookiemaxnum=0",
	},
	{
		header:  Header{"Set-Cookie": strings.Split(strings.Repeat(";a=", defaultCookieMaxNum+1)[1:], ";")},
		cookies: slices.Repeat([]*Cookie{{Name: "a", Value: "", Quoted: false, Raw: "a="}}, defaultCookieMaxNum+1),
		godebug: fmt.Sprintf("httpcookiemaxnum=%v", defaultCookieMaxNum+1),
	},

	// TODO(bradfitz): users have reported seeing this in the
	// wild, but do browsers handle it? RFC 6265 just says "don't
	// do that" (section 3) and then never mentions header folding
	// again.
	// Header{"Set-Cookie": {"ASP.NET_SessionId=foo; path=/; HttpOnly, .ASPXAUTH=7E3AA; expires=Wed, 07-Mar-2012 14:25:06 GMT; path=/; HttpOnly"}},
}

func toJSON(v any) string {
	b, err := json.Marshal(v)
	if err != nil {
		return fmt.Sprintf("%#v", v)
	}
	return string(b)
}

func TestReadSetCookies(t *testing.T) {
	for i, tt := range readSetCookiesTests {
		t.Setenv("GODEBUG", tt.godebug)
		for n := 0; n < 2; n++ { // to verify readSetCookies doesn't mutate its input
			c := readSetCookies(tt.header)
			if !reflect.DeepEqual(c, tt.cookies) {
				t.Errorf("#%d readSetCookies: have\n%s\nwant\n%s\n", i, toJSON(c), toJSON(tt.cookies))
			}
		}
	}
}

var readCookiesTests = []struct {
	header  Header
	filter  string
	cookies []*Cookie
	godebug string
}{
	{
		header: Header{"Cookie": {"Cookie-1=v$1", "c2=v2"}},
		filter: "",
		cookies: []*Cookie{
			{Name: "Cookie-1", Value: "v$1"},
			{Name: "c2", Value: "v2"},
		},
	},
	{
		header: Header{"Cookie": {"Cookie-1=v$1", "c2=v2"}},
		filter: "c2",
		cookies: []*Cookie{
			{Name: "c2", Value: "v2"},
		},
	},
	{
		header: Header{"Cookie": {"Cookie-1=v$1; c2=v2"}},
		filter: "",
		cookies: []*Cookie{
			{Name: "Cookie-1", Value: "v$1"},
			{Name: "c2", Value: "v2"},
		},
	},
	{
		header: Header{"Cookie": {"Cookie-1=v$1; c2=v2"}},
		filter: "c2",
		cookies: []*Cookie{
			{Name: "c2", Value: "v2"},
		},
	},
	{
		header: Header{"Cookie": {`Cookie-1="v$1"; c2="v2"`}},
		filter: "",
		cookies: []*Cookie{
			{Name: "Cookie-1", Value: "v$1", Quoted: true},
			{Name: "c2", Value: "v2", Quoted: true},
		},
	},
	{
		header: Header{"Cookie": {`Cookie-1="v$1"; c2=v2;`}},
		filter: "",
		cookies: []*Cookie{
			{Name: "Cookie-1", Value: "v$1", Quoted: true},
			{Name: "c2", Value: "v2"},
		},
	},
	{
		header:  Header{"Cookie": {``}},
		filter:  "",
		cookies: []*Cookie{},
	},
	// GODEBUG=httpcookiemaxnum should work regardless if all cookies are sent
	// via one "Cookie" field, or multiple fields.
	{
		header:  Header{"Cookie": {strings.Repeat(";a=", defaultCookieMaxNum+1)[1:]}},
		cookies: []*Cookie{},
	},
	{
		header:  Header{"Cookie": slices.Repeat([]string{"a="}, 10)},
		cookies: []*Cookie{},
		godebug: "httpcookiemaxnum=5",
	},
	{
		header:  Header{"Cookie": {strings.Repeat(";a=", defaultCookieMaxNum+1)[1:]}},
		cookies: slices.Repeat([]*Cookie{{Name: "a", Value: "", Quoted: false}}, defaultCookieMaxNum+1),
		godebug: "httpcookiemaxnum=0",
	},
	{
		header:  Header{"Cookie": slices.Repeat([]string{"a="}, defaultCookieMaxNum+1)},
		cookies: slices.Repeat([]*Cookie{{Name: "a", Value: "", Quoted: false}}, defaultCookieMaxNum+1),
		godebug: fmt.Sprintf("httpcookiemaxnum=%v", defaultCookieMaxNum+1),
	},
}

func TestReadCookies(t *testing.T) {
	for i, tt := range readCookiesTests {
		t.Setenv("GODEBUG", tt.godebug)
		for n := 0; n < 2; n++ { // to verify readCookies doesn't mutate its input
			c := readCookies(tt.header, tt.filter)
			if !reflect.DeepEqual(c, tt.cookies) {
				t.Errorf("#%d readCookies:\nhave: %s\nwant: %s\n", i, toJSON(c), toJSON(tt.cookies))
			}
		}
	}
}

func TestSetCookieDoubleQuotes(t *testing.T) {
	res := &Response{Header: Header{}}
	res.Header.Add("Set-Cookie", `quoted0=none; max-age=30`)
	res.Header.Add("Set-Cookie", `quoted1="cookieValue"; max-age=31`)
	res.Header.Add("Set-Cookie", `quoted2=cookieAV; max-age="32"`)
	res.Header.Add("Set-Cookie", `quoted3="both"; max-age="33"`)
	got := res.Cookies()
	want := []*Cookie{
		{Name: "quoted0", Value: "none", MaxAge: 30},
		{Name: "quoted1", Value: "cookieValue", MaxAge: 31},
		{Name: "quoted2", Value: "cookieAV"},
		{Name: "quoted3", Value: "both"},
	}
	if len(got) != len(want) {
		t.Fatalf("got %d cookies, want %d", len(got), len(want))
	}
	for i, w := range want {
		g := got[i]
		if g.Name != w.Name || g.Value != w.Value || g.MaxAge != w.MaxAge {
			t.Errorf("cookie #%d:\ngot  %v\nwant %v", i, g, w)
		}
	}
}

func TestCookieSanitizeValue(t *testing.T) {
	defer log.SetOutput(os.Stderr)
	var logbuf strings.Builder
	log.SetOutput(&logbuf)

	tests := []struct {
		in     string
		quoted bool
		want   string
	}{
		{"foo", false, "foo"},
		{"foo;bar", false, "foobar"},
		{"foo\\bar", false, "foobar"},
		{"foo\"bar", false, "foobar"},
		{"\x00\x7e\x7f\x80", false, "\x7e"},
		{`withquotes`, true, `"withquotes"`},
		{`"withquotes"`, true, `"withquotes"`}, // double quotes are not valid octets
		{"a z", false, `"a z"`},
		{" z", false, `" z"`},
		{"a ", false, `"a "`},
		{"a,z", false, `"a,z"`},
		{",z", false, `",z"`},
		{"a,", false, `"a,"`},
		{"", true, `""`},
	}
	for _, tt := range tests {
		if got := sanitizeCookieValue(tt.in, tt.quoted); got != tt.want {
			t.Errorf("sanitizeCookieValue(%q) = %q; want %q", tt.in, got, tt.want)
		}
	}

	if got, sub := logbuf.String(), "dropping invalid bytes"; !strings.Contains(got, sub) {
		t.Errorf("Expected substring %q in log output. Got:\n%s", sub, got)
	}
}

func TestCookieSanitizePath(t *testing.T) {
	defer log.SetOutput(os.Stderr)
	var logbuf strings.Builder
	log.SetOutput(&logbuf)

	tests := []struct {
		in, want string
	}{
		{"/path", "/path"},
		{"/path with space/", "/path with space/"},
		{"/just;no;semicolon\x00orstuff/", "/justnosemicolonorstuff/"},
	}
	for _, tt := range tests {
		if got := sanitizeCookiePath(tt.in); got != tt.want {
			t.Errorf("sanitizeCookiePath(%q) = %q; want %q", tt.in, got, tt.want)
		}
	}

	if got, sub := logbuf.String(), "dropping invalid bytes"; !strings.Contains(got, sub) {
		t.Errorf("Expected substring %q in log output. Got:\n%s", sub, got)
	}
}

func TestCookieValid(t *testing.T) {
	tests := []struct {
		cookie *Cookie
		valid  bool
	}{
		{nil, false},
		{&Cookie{Name: ""}, false},
		{&Cookie{Name: "invalid-value", Value: "foo\"bar"}, false},
		{&Cookie{Name: "invalid-path", Path: "/foo;bar/"}, false},
		{&Cookie{Name: "invalid-secure-for-partitioned", Value: "foo", Path: "/", Secure: false, Partitioned: true}, false},
		{&Cookie{Name: "invalid-domain", Domain: "example.com:80"}, false},
		{&Cookie{Name: "invalid-expiry", Value: "", Expires: time.Date(1600, 1, 1, 1, 1, 1, 1, time.UTC)}, false},
		{&Cookie{Name: "valid-empty"}, true},
		{&Cookie{Name: "valid-expires", Value: "foo", Path: "/bar", Domain: "example.com", Expires: time.Unix(0, 0)}, true},
		{&Cookie{Name: "valid-max-age", Value: "foo", Path: "/bar", Domain: "example.com", MaxAge: 60}, true},
		{&Cookie{Name: "valid-all-fields", Value: "foo", Path: "/bar", Domain: "example.com", Expires: time.Unix(0, 0), MaxAge: 0}, true},
		{&Cookie{Name: "valid-partitioned", Value: "foo", Path: "/", Secure: true, Partitioned: true}, true},
	}

	for _, tt := range tests {
		err := tt.cookie.Valid()
		if err != nil && tt.valid {
			t.Errorf("%#v.Valid() returned error %v; want nil", tt.cookie, err)
		}
		if err == nil && !tt.valid {
			t.Errorf("%#v.Valid() returned nil; want error", tt.cookie)
		}
	}
}

func BenchmarkCookieString(b *testing.B) {
	const wantCookieString = `cookie-9=i3e01nf61b6t23bvfmplnanol3; Path=/restricted/; Domain=example.com; Expires=Tue, 10 Nov 2009 23:00:00 GMT; Max-Age=3600`
	c := &Cookie{
		Name:    "cookie-9",
		Value:   "i3e01nf61b6t23bvfmplnanol3",
		Expires: time.Unix(1257894000, 0),
		Path:    "/restricted/",
		Domain:  ".example.com",
		MaxAge:  3600,
	}
	var benchmarkCookieString string
	b.ReportAllocs()
	b.ResetTimer()
	for i := 0; i < b.N; i++ {
		benchmarkCookieString = c.String()
	}
	if have, want := benchmarkCookieString, wantCookieString; have != want {
		b.Fatalf("Have: %v Want: %v", have, want)
	}
}

func BenchmarkReadSetCookies(b *testing.B) {
	header := Header{
		"Set-Cookie": {
			"NID=99=YsDT5i3E-CXax-; expires=Wed, 23-Nov-2011 01:05:03 GMT; path=/; domain=.google.ch; HttpOnly",
			".ASPXAUTH=7E3AA; expires=Wed, 07-Mar-2012 14:25:06 GMT; path=/; HttpOnly",
		},
	}
	wantCookies := []*Cookie{
		{
			Name:       "NID",
			Value:      "99=YsDT5i3E-CXax-",
			Path:       "/",
			Domain:     ".google.ch",
			HttpOnly:   true,
			Expires:    time.Date(2011, 11, 23, 1, 5, 3, 0, time.UTC),
			RawExpires: "Wed, 23-Nov-2011 01:05:03 GMT",
			Raw:        "NID=99=YsDT5i3E-CXax-; expires=Wed, 23-Nov-2011 01:05:03 GMT; path=/; domain=.google.ch; HttpOnly",
		},
		{
			Name:       ".ASPXAUTH",
			Value:      "7E3AA",
			Path:       "/",
			Expires:    time.Date(2012, 3, 7, 14, 25, 6, 0, time.UTC),
			RawExpires: "Wed, 07-Mar-2012 14:25:06 GMT",
			HttpOnly:   true,
			Raw:        ".ASPXAUTH=7E3AA; expires=Wed, 07-Mar-2012 14:25:06 GMT; path=/; HttpOnly",
		},
	}
	var c []*Cookie
	b.ReportAllocs()
	b.ResetTimer()
	for i := 0; i < b.N; i++ {
		c = readSetCookies(header)
	}
	if !reflect.DeepEqual(c, wantCookies) {
		b.Fatalf("readSetCookies:\nhave: %s\nwant: %s\n", toJSON(c), toJSON(wantCookies))
	}
}

func BenchmarkReadCookies(b *testing.B) {
	cookie := `de=; client_region=0; rpld1=0:hispeed.ch|20:che|21:zh|22:zurich|23:47.36|24:8.53|; rpld0=1:08|; backplane-channel=newspaper.com:1471; devicetype=0; osfam=0; rplmct=2; s_pers=%20s_vmonthnum%3D1472680800496%2526vn%253D1%7C1472680800496%3B%20s_nr%3D1471686767664-New%7C1474278767664%3B%20s_lv%3D1471686767669%7C1566294767669%3B%20s_lv_s%3DFirst%2520Visit%7C1471688567669%3B%20s_monthinvisit%3Dtrue%7C1471688567677%3B%20gvp_p5%3Dsports%253Ablog%253Aearly-lead%2520-%2520184693%2520-%252020160820%2520-%2520u-s%7C1471688567681%3B%20gvp_p51%3Dwp%2520-%2520sports%7C1471688567684%3B; s_sess=%20s_wp_ep%3Dhomepage%3B%20s._ref%3Dhttps%253A%252F%252Fwww.google.ch%252F%3B%20s_cc%3Dtrue%3B%20s_ppvl%3Dsports%25253Ablog%25253Aearly-lead%252520-%252520184693%252520-%25252020160820%252520-%252520u-lawyer%252C12%252C12%252C502%252C1231%252C502%252C1680%252C1050%252C2%252CP%3B%20s_ppv%3Dsports%25253Ablog%25253Aearly-lead%252520-%252520184693%252520-%25252020160820%252520-%252520u-s-lawyer%252C12%252C12%252C502%252C1231%252C502%252C1680%252C1050%252C2%252CP%3B%20s_dslv%3DFirst%2520Visit%3B%20s_sq%3Dwpninewspapercom%253D%252526pid%25253Dsports%2525253Ablog%2525253Aearly-lead%25252520-%25252520184693%25252520-%2525252020160820%25252520-%25252520u-s%252526pidt%25253D1%252526oid%25253Dhttps%2525253A%2525252F%2525252Fwww.newspaper.com%2525252F%2525253Fnid%2525253Dmenu_nav_homepage%252526ot%25253DA%3B`
	header := Header{"Cookie": {cookie}}
	wantCookies := []*Cookie{
		{Name: "de", Value: ""},
		{Name: "client_region", Value: "0"},
		{Name: "rpld1", Value: "0:hispeed.ch|20:che|21:zh|22:zurich|23:47.36|24:8.53|"},
		{Name: "rpld0", Value: "1:08|"},
		{Name: "backplane-channel", Value: "newspaper.com:1471"},
		{Name: "devicetype", Value: "0"},
		{Name: "osfam", Value: "0"},
		{Name: "rplmct", Value: "2"},
		{Name: "s_pers", Value: "%20s_vmonthnum%3D1472680800496%2526vn%253D1%7C1472680800496%3B%20s_nr%3D1471686767664-New%7C1474278767664%3B%20s_lv%3D1471686767669%7C1566294767669%3B%20s_lv_s%3DFirst%2520Visit%7C1471688567669%3B%20s_monthinvisit%3Dtrue%7C1471688567677%3B%20gvp_p5%3Dsports%253Ablog%253Aearly-lead%2520-%2520184693%2520-%252020160820%2520-%2520u-s%7C1471688567681%3B%20gvp_p51%3Dwp%2520-%2520sports%7C1471688567684%3B"},
		{Name: "s_sess", Value: "%20s_wp_ep%3Dhomepage%3B%20s._ref%3Dhttps%253A%252F%252Fwww.google.ch%252F%3B%20s_cc%3Dtrue%3B%20s_ppvl%3Dsports%25253Ablog%25253Aearly-lead%252520-%252520184693%252520-%25252020160820%252520-%252520u-lawyer%252C12%252C12%252C502%252C1231%252C502%252C1680%252C1050%252C2%252CP%3B%20s_ppv%3Dsports%25253Ablog%25253Aearly-lead%252520-%252520184693%252520-%25252020160820%252520-%252520u-s-lawyer%252C12%252C12%252C502%252C1231%252C502%252C1680%252C1050%252C2%252CP%3B%20s_dslv%3DFirst%2520Visit%3B%20s_sq%3Dwpninewspapercom%253D%252526pid%25253Dsports%2525253Ablog%2525253Aearly-lead%25252520-%25252520184693%25252520-%2525252020160820%25252520-%25252520u-s%252526pidt%25253D1%252526oid%25253Dhttps%2525253A%2525252F%2525252Fwww.newspaper.com%2525252F%2525253Fnid%2525253Dmenu_nav_homepage%252526ot%25253DA%3B"},
	}
	var c []*Cookie

	b.Run("readCookies", func(b *testing.B) {
		b.ReportAllocs()
		for i := 0; i < b.N; i++ {
			c = readCookies(header, "")
		}
	})
	if !reflect.DeepEqual(c, wantCookies) {
		b.Fatalf("readCookies:\nhave: %s\nwant: %s\n", toJSON(c), toJSON(wantCookies))
	}

	b.Run("ParseCookie", func(b *testing.B) {
		b.ReportAllocs()
		for i := 0; i < b.N; i++ {
			c, _ = ParseCookie(cookie)
		}
	})
	if !reflect.DeepEqual(c, wantCookies) {
		b.Fatalf("ParseCookie:\nhave: %s\nwant: %s\n", toJSON(c), toJSON(wantCookies))
	}
}

func TestParseCookie(t *testing.T) {
	tests := []struct {
		line    string
		cookies []*Cookie
		err     error
		godebug string
	}{
		{
			line:    "Cookie-1=v$1",
			cookies: []*Cookie{{Name: "Cookie-1", Value: "v$1"}},
		},
		{
			line:    "Cookie-1=v$1;c2=v2",
			cookies: []*Cookie{{Name: "Cookie-1", Value: "v$1"}, {Name: "c2", Value: "v2"}},
		},
		{
			line:    `Cookie-1="v$1";c2="v2"`,
			cookies: []*Cookie{{Name: "Cookie-1", Value: "v$1", Quoted: true}, {Name: "c2", Value: "v2", Quoted: true}},
		},
		{
			line:    "k1=",
			cookies: []*Cookie{{Name: "k1", Value: ""}},
		},
		{
			line: "",
			err:  errBlankCookie,
		},
		{
			line: "equal-not-found",
			err:  errEqualNotFoundInCookie,
		},
		{
			line: "=v1",
			err:  errInvalidCookieName,
		},
		{
			line: "k1=\\",
			err:  errInvalidCookieValue,
		},
		{
			line: strings.Repeat(";a=", defaultCookieMaxNum+1)[1:],
			err:  errCookieNumLimitExceeded,
		},
		{
			line:    strings.Repeat(";a=", 10)[1:],
			err:     errCookieNumLimitExceeded,
			godebug: "httpcookiemaxnum=5",
		},
		{
			line:    strings.Repeat(";a=", defaultCookieMaxNum+1)[1:],
			cookies: slices.Repeat([]*Cookie{{Name: "a", Value: "", Quoted: false}}, defaultCookieMaxNum+1),
			godebug: "httpcookiemaxnum=0",
		},
		{
			line:    strings.Repeat(";a=", defaultCookieMaxNum+1)[1:],
			cookies: slices.Repeat([]*Cookie{{Name: "a", Value: "", Quoted: false}}, defaultCookieMaxNum+1),
			godebug: fmt.Sprintf("httpcookiemaxnum=%v", defaultCookieMaxNum+1),
		},
	}
	for i, tt := range tests {
		t.Setenv("GODEBUG", tt.godebug)
		gotCookies, gotErr := ParseCookie(tt.line)
		if !errors.Is(gotErr, tt.err) {
			t.Errorf("#%d ParseCookie got error %v, want error %v", i, gotErr, tt.err)
		}
		if !reflect.DeepEqual(gotCookies, tt.cookies) {
			t.Errorf("#%d ParseCookie:\ngot cookies: %s\nwant cookies: %s\n", i, toJSON(gotCookies), toJSON(tt.cookies))
		}
	}
}

func TestParseSetCookie(t *testing.T) {
	tests := []struct {
		line   string
		cookie *Cookie
		err    error
	}{
		{
			line:   "Cookie-1=v$1",
			cookie: &Cookie{Name: "Cookie-1", Value: "v$1", Raw: "Cookie-1=v$1"},
		},
		{
			line: "NID=99=YsDT5i3E-CXax-; expires=Wed, 23-Nov-2011 01:05:03 GMT; path=/; domain=.google.ch; HttpOnly",
			cookie: &Cookie{
				Name:       "NID",
				Value:      "99=YsDT5i3E-CXax-",
				Path:       "/",
				Domain:     ".google.ch",
				HttpOnly:   true,
				Expires:    time.Date(2011, 11, 23, 1, 5, 3, 0, time.UTC),
				RawExpires: "Wed, 23-Nov-2011 01:05:03 GMT",
				Raw:        "NID=99=YsDT5i3E-CXax-; expires=Wed, 23-Nov-2011 01:05:03 GMT; path=/; domain=.google.ch; HttpOnly",
			},
		},
		{
			line: ".ASPXAUTH=7E3AA; expires=Wed, 07-Mar-2012 14:25:06 GMT; path=/; HttpOnly",
			cookie: &Cookie{
				Name:       ".ASPXAUTH",
				Value:      "7E3AA",
				Path:       "/",
				Expires:    time.Date(2012, 3, 7, 14, 25, 6, 0, time.UTC),
				RawExpires: "Wed, 07-Mar-2012 14:25:06 GMT",
				HttpOnly:   true,
				Raw:        ".ASPXAUTH=7E3AA; expires=Wed, 07-Mar-2012 14:25:06 GMT; path=/; HttpOnly",
			},
		},
		{
			line: "ASP.NET_SessionId=foo; path=/; HttpOnly",
			cookie: &Cookie{
				Name:     "ASP.NET_SessionId",
				Value:    "foo",
				Path:     "/",
				HttpOnly: true,
				Raw:      "ASP.NET_SessionId=foo; path=/; HttpOnly",
			},
		},
		{
			line: "samesitedefault=foo; SameSite",
			cookie: &Cookie{
				Name:     "samesitedefault",
				Value:    "foo",
				SameSite: SameSiteDefaultMode,
				Raw:      "samesitedefault=foo; SameSite",
			},
		},
		{
			line: "samesiteinvalidisdefault=foo; SameSite=invalid",
			cookie: &Cookie{
				Name:     "samesiteinvalidisdefault",
				Value:    "foo",
				SameSite: SameSiteDefaultMode,
				Raw:      "samesiteinvalidisdefault=foo; SameSite=invalid",
			},
		},
		{
			line: "samesitelax=foo; SameSite=Lax",
			cookie: &Cookie{
				Name:     "samesitelax",
				Value:    "foo",
				SameSite: SameSiteLaxMode,
				Raw:      "samesitelax=foo; SameSite=Lax",
			},
		},
		{
			line: "samesitestrict=foo; SameSite=Strict",
			cookie: &Cookie{
				Name:     "samesitestrict",
				Value:    "foo",
				SameSite: SameSiteStrictMode,
				Raw:      "samesitestrict=foo; SameSite=Strict",
			},
		},
		{
			line: "samesitenone=foo; SameSite=None",
			cookie: &Cookie{
				Name:     "samesitenone",
				Value:    "foo",
				SameSite: SameSiteNoneMode,
				Raw:      "samesitenone=foo; SameSite=None",
			},
		},
		// Make sure we can properly read back the Set-Cookie headers we create
		// for values containing spaces or commas:
		{
			line:   `special-1=a z`,
			cookie: &Cookie{Name: "special-1", Value: "a z", Raw: `special-1=a z`},
		},
		{
			line:   `special-2=" z"`,
			cookie: &Cookie{Name: "special-2", Value: " z", Quoted: true, Raw: `special-2=" z"`},
		},
		{
			line:   `special-3="a "`,
			cookie: &Cookie{Name: "special-3", Value: "a ", Quoted: true, Raw: `special-3="a "`},
		},
		{
			line:   `special-4=" "`,
			cookie: &Cookie{Name: "special-4", Value: " ", Quoted: true, Raw: `special-4=" "`},
		},
		{
			line:   `special-5=a,z`,
			cookie: &Cookie{Name: "special-5", Value: "a,z", Raw: `special-5=a,z`},
		},
		{
			line:   `special-6=",z"`,
			cookie: &Cookie{Name: "special-6", Value: ",z", Quoted: true, Raw: `special-6=",z"`},
		},
		{
			line:   `special-7=a,`,
			cookie: &Cookie{Name: "special-7", Value: "a,", Raw: `special-7=a,`},
		},
		{
			line:   `special-8=","`,
			cookie: &Cookie{Name: "special-8", Value: ",", Quoted: true, Raw: `special-8=","`},
		},
		// Make sure we can properly read back the Set-Cookie headers
		// for names containing spaces:
		{
			line:   `special-9 =","`,
			cookie: &Cookie{Name: "special-9", Value: ",", Quoted: true, Raw: `special-9 =","`},
		},
		{
			line: "",
			err:  errBlankCookie,
		},
		{
			line: "equal-not-found",
			err:  errEqualNotFoundInCookie,
		},
		{
			line: "=v1",
			err:  errInvalidCookieName,
		},
		{
			line: "k1=\\",
			err:  errInvalidCookieValue,
		},
	}
	for i, tt := range tests {
		gotCookie, gotErr := ParseSetCookie(tt.line)
		if !errors.Is(gotErr, tt.err) {
			t.Errorf("#%d ParseSetCookie got error %v, want error %v", i, gotErr, tt.err)
			continue
		}
		if !reflect.DeepEqual(gotCookie, tt.cookie) {
			t.Errorf("#%d ParseSetCookie:\ngot cookie: %s\nwant cookie: %s\n", i, toJSON(gotCookie), toJSON(tt.cookie))
		}
	}
}