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package cnp

import (
	"bytes"
	"strconv"
	"strings"
	"testing"
	"time"
)

type requestTest struct {
	h, s string
	p    Parameters
	e, v error
}

var requestTests = []requestTest{
	// invalid intent
	{"", "", nil, ErrorInvalid{}, nil},
	{"", "foo/bar", nil, ErrorInvalid{}, nil},
	{"foo/", "bar", nil, ErrorInvalid{}, nil},
	{"foo/", "/bar", nil, ErrorInvalid{}, nil},

	// invalid request params
	{"", "/", Parameters{"length": "w"}, nil, ErrorInvalid{}},
	{"", "/", Parameters{"length": "-1"}, nil, ErrorInvalid{}},
	{"", "/", Parameters{"length": "03"}, nil, ErrorInvalid{}},
	{"", "/", Parameters{"name": "foo/bar"}, nil, ErrorInvalid{}},
	{"", "/", Parameters{"name": "foo\x00bar"}, nil, ErrorInvalid{}},
	{"", "/", Parameters{"type": "foo"}, nil, ErrorInvalid{}},
	{"", "/", Parameters{"type": "\x00"}, nil, ErrorInvalid{}},
	{"", "/", Parameters{"type": "text/plain\x00"}, nil, ErrorInvalid{}},
	{"", "/", Parameters{"type": "foo/bar "}, nil, ErrorInvalid{}},
	{"", "/", Parameters{"type": " foo/bar"}, nil, ErrorInvalid{}},
	{"", "/", Parameters{"type": "foo /bar"}, nil, ErrorInvalid{}},
	{"", "/", Parameters{"type": "foo/ bar"}, nil, ErrorInvalid{}},
	{"", "/", Parameters{"type": "foo/bar\n"}, nil, ErrorInvalid{}},
	{"", "/", Parameters{"type": "foo/b(r"}, nil, ErrorInvalid{}},
	{"", "/", Parameters{"if_modified": "0"}, nil, ErrorInvalid{}},
	{"", "/", Parameters{"if_modified": "now"}, nil, ErrorInvalid{}},
	{"", "/", Parameters{"if_modified": "today"}, nil, ErrorInvalid{}},
	{"", "/", Parameters{"if_modified": "Thu Jan  1 00:00:00 UTC 1970"}, nil, ErrorInvalid{}},
	{"", "/", Parameters{"if_modified": "1970-01-01 00:00:00+00:00"}, nil, ErrorInvalid{}},
	{"", "/", Parameters{"if_modified": "1970-01-01 00:00:00 UTC"}, nil, ErrorInvalid{}},
	{"", "/", Parameters{"if_modified": "1970-01-01 00:00:00+0000"}, nil, ErrorInvalid{}},
	{"", "/", Parameters{"if_modified": "1970-01-01 00:00:00+00"}, nil, ErrorInvalid{}},
	{"", "/", Parameters{"if_modified": "1970-01-01T00:00:00+00:00"}, nil, ErrorInvalid{}},
	{"", "/", Parameters{"if_modified": "1970-01-01T00:00:00 UTC"}, nil, ErrorInvalid{}},
	{"", "/", Parameters{"if_modified": "1970-01-01T00:00:00+0000"}, nil, ErrorInvalid{}},
	{"", "/", Parameters{"if_modified": "1970-01-01T00:00:00+00"}, nil, ErrorInvalid{}},
	{"", "/", Parameters{"if_modified": "0000-00-01T00:00:00Z"}, nil, ErrorInvalid{}},
	{"", "/", Parameters{"if_modified": "0000-01-00T00:00:00Z"}, nil, ErrorInvalid{}},
	{"", "/", Parameters{"if_modified": "0000-01-01T24:00:00Z"}, nil, ErrorInvalid{}},
	{"", "/", Parameters{"if_modified": "0000-01-01T00:60:00Z"}, nil, ErrorInvalid{}},
	{"", "/", Parameters{"if_modified": "0000-01-01T00:00:60Z"}, nil, ErrorInvalid{}},
	{"", "/", Parameters{"if_modified": "0000-11-31T00:00:00Z"}, nil, ErrorInvalid{}},
	{"", "/", Parameters{"if_modified": "0001-02-29T00:00:00Z"}, nil, ErrorInvalid{}},
	{"", "/", Parameters{"if_modified": "0002-02-29T00:00:00Z"}, nil, ErrorInvalid{}},
	{"", "/", Parameters{"if_modified": "0003-02-29T00:00:00Z"}, nil, ErrorInvalid{}},
	{"", "/", Parameters{"if_modified": "0005-02-29T00:00:00Z"}, nil, ErrorInvalid{}},
	{"", "/", Parameters{"if_modified": "0100-02-29T00:00:00Z"}, nil, ErrorInvalid{}},
	{"", "/", Parameters{"if_modified": "1000-02-29T00:00:00Z"}, nil, ErrorInvalid{}},
	{"", "/", Parameters{"if_modified": "123-01-01T00:00:00Z"}, nil, ErrorInvalid{}},
	{"", "/", Parameters{"if_modified": "12345-01-01T00:00:00Z"}, nil, ErrorInvalid{}},
	{"", "/", Parameters{"if_modified": "-5-01-01T00:00:00Z"}, nil, ErrorInvalid{}},
	{"", "/", Parameters{"if_modified": "-2005-01-01T00:00:00Z"}, nil, ErrorInvalid{}},
	{"", "/", Parameters{"select": "w"}, nil, ErrorInvalid{}},
	{"", "/", Parameters{"select": " "}, nil, ErrorInvalid{}},
	{"", "/", Parameters{"select": ":"}, nil, ErrorInvalid{}},
	{"", "/", Parameters{"select": ":foobar"}, nil, ErrorInvalid{}},

	// valid simple requests
	{"", "/", nil, nil, nil},
	{"", "/foo/bar", nil, nil, nil},
	{"cnp.example.com", "/", nil, nil, nil},
	{"foo", "/bar", nil, nil, nil},
	{"example.com", "/ f=#\\oo///.././.../~/\x01/\xff/ba\nr", nil, nil, nil},

	// valid request params
	{"", "/", Parameters{"length": "", "name": "", "type": "", "if_modified": "", "select": "", "": "", "q\x00we": "=a s\nd"}, nil, nil},
	{"", "/", Parameters{"length": "0"}, nil, nil},
	{"", "/", Parameters{"length": "1"}, nil, nil},
	{"", "/", Parameters{"length": "12345670089000000"}, nil, nil},
	{"", "/", Parameters{"name": "foobar"}, nil, nil},
	{"", "/", Parameters{"name": "x"}, nil, nil},
	{"", "/", Parameters{"name": "..-~!foo bar\nbaz\rquux=qwe\\asd"}, nil, nil},
	{"", "/", Parameters{"name": strings.Repeat("w", 1024*8)}, nil, nil},
	{"", "/", Parameters{"type": "qwe/asd"}, nil, nil},
	{"", "/", Parameters{"type": "qwe+asd/foo"}, nil, nil},
	{"", "/", Parameters{"type": "qwe-asd/foo"}, nil, nil},
	{"", "/", Parameters{"if_modified": "1970-01-01T00:00:00Z"}, nil, nil},
	{"", "/", Parameters{"if_modified": "0000-01-01T00:00:00Z"}, nil, nil},
	{"", "/", Parameters{"if_modified": "9999-12-31T23:59:59Z"}, nil, nil},
	{"", "/", Parameters{"if_modified": "0123-05-06T07:08:09Z"}, nil, nil},
	{"", "/", Parameters{"if_modified": "0000-02-29T00:00:00Z"}, nil, nil},
	{"", "/", Parameters{"if_modified": "2000-02-29T00:00:00Z"}, nil, nil},
	{"", "/", Parameters{"select": "\x00:\x00"}, nil, nil},
	{"", "/", Parameters{"select": "foo:bar:baz"}, nil, nil},
	{"", "/", Parameters{"select": "byte:5-"}, nil, nil},
	{"", "/", Parameters{"select": "cnm:#/foo/bar"}, nil, nil},
}

func TestNewRequest(t *testing.T) {
	for _, tst := range requestTests {
		req, err := NewRequest(tst.h, tst.s, []byte{})
		if !errorEqual(tst.e, err) {
			t.Errorf("NewRequest(%q, %q): expected error %+v, got %+v (%v)", tst.h, tst.s, tst.e, err, err)
			continue
		}
		if tst.e == nil {
			if tst.h != req.Host() {
				t.Errorf("NewRequest(%q: %q): got unexpected host %q", tst.h, tst.s, req.Host())
			} else if Clean(tst.s) != req.Path() {
				t.Errorf("NewRequest(%q: %q): got unexpected path %q", tst.h, tst.s, req.Path())
			}
		}
	}
}

type requestURLTest struct {
	u    string
	h, p string
	e    error
}

var requestURLTests = []requestURLTest{
	// invalid
	{"cnp:example.com/path/to/file", "", "", ErrorURL{}},
	{"http://example.com/path/to/file", "", "", ErrorURL{}},
	{"cnp://foo@bar:example.com/path/to/file", "", "", ErrorURL{}},
	{"cnp://foo:example.com/path/to/file", "", "", ErrorURL{}},
	{"", "", "/", ErrorURL{}},
	{"cnp://example.com/%5", "", "", ErrorURL{}},
	//{"cnp://example.com/?%5", "", "", ErrorURL{}},

	// valid
	{"cnp://example.com/path/to/file", "example.com", "/path/to/file", nil},
	{"cnp://2130706433/", "2130706433", "/", nil},
	//{"cnp://02130706433/", "2130706433", "/", nil},
	{"cnp://127.0.0.1/", "127.0.0.1", "/", nil},
	//{"cnp://0127.0.00.01/", "127.0.0.1", "/", nil},
	{"cnp://localhost", "localhost", "/", nil},
	{"cnp://[::1]/foo%20bar", "[::1]", "/foo bar", nil},
	{"cnp://[2001:db8::7334]/foo%0abar", "[2001:db8::7334]", "/foo\nbar", nil},
	//{"cnp://[2001:0db8:0000::7334]/foo%0abar", "[2001:db8::7334]", "/foo\nbar", nil},
	//{"cnp://example.com/qwe%20asd?foo=bar&baz=qu%20ux", "example.com", "/qwe asd?foo=bar&baz=qu ux", nil},
	{"cnp://example.com/qwe%20asd?foo=bar&baz=qu%20ux", "example.com", "/qwe asd", nil},
	{"cnp://localhost:25454", "localhost", "/", nil},
	{"cnp://localhost:12345/foo/bar", "localhost:12345", "/foo/bar", nil},
	{"cnp://localhost:25454/foo/bar", "localhost", "/foo/bar", nil},
	{"cnp://2130706433:12345/foo/bar", "2130706433:12345", "/foo/bar", nil},
	{"cnp://2130706433:25454/foo/bar", "2130706433", "/foo/bar", nil},
	{"cnp://127.0.0.1:12345/foo/bar", "127.0.0.1:12345", "/foo/bar", nil},
	{"cnp://127.0.0.1:25454/foo/bar", "127.0.0.1", "/foo/bar", nil},
	{"cnp://[::1]:12345/foo/bar", "[::1]:12345", "/foo/bar", nil},
	{"cnp://[::1]:25454/foo/bar", "[::1]", "/foo/bar", nil},
	{"//example.com/path/", "example.com", "/path/", nil},
	{"/example.com/path/", "", "/example.com/path/", nil},
	{"/foo/bar", "", "/foo/bar", nil},
	{"/", "", "/", nil},
	{"cnp://example.com/ ™☺)\n", "example.com", "/ ™☺)\n", nil},
	{"cnp://œ¤å₥¶ḹə.©°ɱ/baz/../foo/.//bar////.//../bar//", "œ¤å₥¶ḹə.©°ɱ", "/foo/bar/", nil},
	{"cnp://foo/bar/", "foo", "/bar/", nil},
	{"cnp:///foo/bar/", "", "/foo/bar/", nil},
	{"cnp:////////foo/bar/", "", "/foo/bar/", nil},
}

func TestNewRequestURL(t *testing.T) {
	for _, tst := range requestURLTests {
		req, err := NewRequestURL(tst.u, nil)
		if !errorEqual(tst.e, err) {
			t.Errorf("NewRequestURL(%q, nil): expected error %+v, got %+v (%v)", tst.u, tst.e, err, err)
			continue
		}
		if tst.e == nil {
			if req.Host() != tst.h {
				t.Errorf("NewRequestURL(%q, nil): expected host %q, got %q", tst.u, tst.h, req.Host())
			} else if req.Path() != tst.p {
				t.Errorf("NewRequestURL(%q, nil): expected path %q, got %q", tst.u, tst.p, req.Path())
			}
		}
	}
}

func TestWriteParseRequest(t *testing.T) {
	for _, tst := range requestTests {
		if tst.e != nil {
			continue // skip syntax errors but not invalid params
		}
		req := &Request{Message{Header{0, 3, "/", Parameters{}}, nil, nil}}
		if err := req.SetHost(tst.h); err != nil {
			t.Errorf("SetHost(%q) error: %v", tst.h, err)
			continue
		}
		if err := req.SetPath(tst.s); err != nil {
			t.Errorf("SetPath(%q) error: %v", tst.s, err)
			continue
		}
		for k, v := range tst.p {
			req.SetParam(k, v)
		}

		var buf bytes.Buffer
		if err := req.Write(&buf); err != nil {
			t.Errorf("%+v.Write: error %v", req, err)
			continue
		}

		s := buf.String()
		req2, err := ParseRequest(strings.NewReader(s))
		if err != nil {
			t.Errorf("ParseRequest(%q) error: %v", s, err)
			continue
		}
		if !msgEqual(&req.Message, &req2.Message) {
			t.Errorf("Write/Parse: expected %+v, got %+v", req, req2)
			continue
		}
	}
}

func TestRequestValidate(t *testing.T) {
	for _, tst := range requestTests {
		if tst.e != nil {
			continue
		}
		req := &Request{Message{Header{Intent: tst.h + tst.s, Parameters: tst.p}, nil, nil}}
		if err := req.Validate(); !errorEqual(tst.v, err) {
			t.Errorf("%+v.Validate(): expected error %+v, got %+v (%v)", req, tst.v, err, err)
		}
	}
}

func TestRequestGetSet(t *testing.T) {
	e := func(k, v string, expect, err error) {
		if !errorEqual(err, expect) {
			t.Errorf("setting param %q to %q: expected %+v, got %+v (%v)", k, v, expect, err, err)
		}
	}
	c := func(k, v string, expect error, p string) {
		if expect == nil && v != p {
			t.Errorf("getting param %q: expected %q, got %q", k, v, p)
		}
	}

	for _, tst := range requestTests {
		if tst.e != nil {
			continue
		}
		req, _ := NewRequest(tst.h, tst.s, nil)
		for k, v := range tst.p {
			switch k {
			case "length":
				n, _ := strconv.ParseUint(v, 10, 63)
				req.SetLength(int64(n))
				s := strconv.FormatInt(req.Length(), 10)
				if s == "0" && v == "" {
					s = ""
				}
				c(k, v, tst.v, s)
			case "name":
				e(k, v, tst.v, req.SetName(v))
				c(k, v, tst.v, req.Name())
			case "type":
				e(k, v, tst.v, req.SetType(v))
				t := req.Type()
				if t == "application/octet-stream" && v == "" {
					t = ""
				}
				c(k, v, tst.v, t)
			case "if_modified":
				if tst.v != nil {
					continue // invalid time format, can't even parse
				}
				var tm time.Time
				if v != "" {
					tm, _ = time.Parse(time.RFC3339, v)
				}
				req.SetIfModified(tm)
				tm2 := ""
				if !req.IfModified().IsZero() {
					tm2 = req.IfModified().Format(time.RFC3339)
				}
				c(k, v, tst.v, tm2)
			case "select":
				if tst.v != nil {
					continue
				}
				sel := ""
				ss := strings.SplitN(v, ":", 2)
				if len(ss) == 2 {
					req.SetSelect(ss[0], ss[1])
					a, b := req.Select()
					if a != "" {
						sel = a + ":" + b
					}
				}
				c(k, v, tst.v, sel)
			default:
				req.SetParam(k, v)
				c(k, v, tst.v, req.Param(k))
			}
		}
	}
}

var urlTests = map[string]string{
	"œ¤å₥¶ḹə.©°ɱ/foo/bar":       "cnp://%C5%93%C2%A4%C3%A5%E2%82%A5%C2%B6%E1%B8%B9%C9%99.%C2%A9%C2%B0%C9%B1/foo/bar",
	"2130706433/":               "cnp://2130706433/",
	"example.com/path/to/file/": "cnp://example.com/path/to/file/",
	"[::1]/foo bar":             "cnp://[::1]/foo%20bar",
	"[2001:db8::7334]/foo\nbar": "cnp://[2001:db8::7334]/foo%0Abar",
	"example.com/qwe asd":       "cnp://example.com/qwe%20asd",
	"example.com/ ™☺)\n":        "cnp://example.com/%20%E2%84%A2%E2%98%BA%29%0A",
}

func TestRequestURL(t *testing.T) {
	for k, v := range urlTests {
		t.Run(v, func(t *testing.T) {
			req, err := NewRequestURL(v, nil)
			if err != nil {
				t.Fatalf("NewRequestURL(%q): error: %v", v, err)
			}
			if req.Intent() != k {
				t.Fatalf("NewRequestURL(%q).Intent(): expected %q, got %q", v, k, req.Intent())
			}
			if req.URL().String() != v {
				t.Fatalf("NewRequestURL(%q).URL(): expected %q, got %q", v, v, req.URL())
			}
		})
	}
}

var cleanTests = map[string]string{
	"/../.././//foo/bar/..":               "/foo",
	"//foo/bar/../":                       "/foo/",
	"/":                                   "/",
	"//":                                  "/",
	"/..":                                 "/",
	"/../..":                              "/",
	"/../":                                "/",
	"/.":                                  "/",
	"/./":                                 "/",
	"/./.":                                "/",
	"/././":                               "/",
	"/./../":                              "/",
	"/.././":                              "/",
	"/foo/bar/../baz":                     "/foo/baz",
	"/foo/bar/../baz/":                    "/foo/baz/",
	"/foo/../foo/bar/../bar/baz/quux/../": "/foo/bar/baz/",
	"/foo/../foo/bar/../bar/baz/quux/..":  "/foo/bar/baz",
}

func TestClean(t *testing.T) {
	for k, v := range cleanTests {
		t.Run(k, func(t *testing.T) {
			c := Clean(k)
			if c != v {
				t.Fatalf("Clean(%q): expected %q, got %q", k, v, c)
			}
		})
	}
}