// 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.

package template

import (
	"testing"
)

func TestURLNormalizer(t *testing.T) {
	tests := []struct {
		url, want string
	}{
		{"", ""},
		{
			"http://example.com:80/foo/bar?q=foo%20&bar=x+y#frag",
			"http://example.com:80/foo/bar?q=foo%20&bar=x+y#frag",
		},
		{" ", "%20"},
		{"%7c", "%7c"},
		{"%7C", "%7C"},
		{"%2", "%252"},
		{"%", "%25"},
		{"%z", "%25z"},
		{"/foo|bar/%5c\u1234", "/foo%7cbar/%5c%e1%88%b4"},
	}
	for _, test := range tests {
		if got := urlNormalizer(test.url); test.want != got {
			t.Errorf("%q: want\n\t%q\nbut got\n\t%q", test.url, test.want, got)
		}
		if test.want != urlNormalizer(test.want) {
			t.Errorf("not idempotent: %q", test.want)
		}
	}
}

func TestURLFilters(t *testing.T) {
	input := ("\x00\x01\x02\x03\x04\x05\x06\x07\x08\t\n\x0b\x0c\r\x0e\x0f" +
		"\x10\x11\x12\x13\x14\x15\x16\x17\x18\x19\x1a\x1b\x1c\x1d\x1e\x1f" +
		` !"#$%&'()*+,-./` +
		`0123456789:;<=>?` +
		`@ABCDEFGHIJKLMNO` +
		`PQRSTUVWXYZ[\]^_` +
		"`abcdefghijklmno" +
		"pqrstuvwxyz{|}~\x7f" +
		"\u00A0\u0100\u2028\u2029\ufeff\U0001D11E")

	tests := []struct {
		name    string
		escaper func(...any) string
		escaped string
	}{
		{
			"urlEscaper",
			urlEscaper,
			"%00%01%02%03%04%05%06%07%08%09%0a%0b%0c%0d%0e%0f" +
				"%10%11%12%13%14%15%16%17%18%19%1a%1b%1c%1d%1e%1f" +
				"%20%21%22%23%24%25%26%27%28%29%2a%2b%2c-.%2f" +
				"0123456789%3a%3b%3c%3d%3e%3f" +
				"%40ABCDEFGHIJKLMNO" +
				"PQRSTUVWXYZ%5b%5c%5d%5e_" +
				"%60abcdefghijklmno" +
				"pqrstuvwxyz%7b%7c%7d~%7f" +
				"%c2%a0%c4%80%e2%80%a8%e2%80%a9%ef%bb%bf%f0%9d%84%9e",
		},
		{
			"urlNormalizer",
			urlNormalizer,
			"%00%01%02%03%04%05%06%07%08%09%0a%0b%0c%0d%0e%0f" +
				"%10%11%12%13%14%15%16%17%18%19%1a%1b%1c%1d%1e%1f" +
				"%20!%22#$%25&%27%28%29*+,-./" +
				"0123456789:;%3c=%3e?" +
				"@ABCDEFGHIJKLMNO" +
				"PQRSTUVWXYZ[%5c]%5e_" +
				"%60abcdefghijklmno" +
				"pqrstuvwxyz%7b%7c%7d~%7f" +
				"%c2%a0%c4%80%e2%80%a8%e2%80%a9%ef%bb%bf%f0%9d%84%9e",
		},
	}

	for _, test := range tests {
		if s := test.escaper(input); s != test.escaped {
			t.Errorf("%s: want\n\t%q\ngot\n\t%q", test.name, test.escaped, s)
			continue
		}
	}
}

func TestSrcsetFilter(t *testing.T) {
	tests := []struct {
		name  string
		input string
		want  string
	}{
		{
			"one ok",
			"http://example.com/img.png",
			"http://example.com/img.png",
		},
		{
			"one ok with metadata",
			" /img.png 200w",
			" /img.png 200w",
		},
		{
			"one bad",
			"javascript:alert(1) 200w",
			"#ZgotmplZ",
		},
		{
			"two ok",
			"foo.png, bar.png",
			"foo.png, bar.png",
		},
		{
			"left bad",
			"javascript:alert(1), /foo.png",
			"#ZgotmplZ, /foo.png",
		},
		{
			"right bad",
			"/bogus#, javascript:alert(1)",
			"/bogus#,#ZgotmplZ",
		},
	}

	for _, test := range tests {
		if got := srcsetFilterAndEscaper(test.input); got != test.want {
			t.Errorf("%s: srcsetFilterAndEscaper(%q) want %q != %q", test.name, test.input, test.want, got)
		}
	}
}

func BenchmarkURLEscaper(b *testing.B) {
	for i := 0; i < b.N; i++ {
		urlEscaper("http://example.com:80/foo?q=bar%20&baz=x+y#frag")
	}
}

func BenchmarkURLEscaperNoSpecials(b *testing.B) {
	for i := 0; i < b.N; i++ {
		urlEscaper("TheQuickBrownFoxJumpsOverTheLazyDog.")
	}
}

func BenchmarkURLNormalizer(b *testing.B) {
	for i := 0; i < b.N; i++ {
		urlNormalizer("The quick brown fox jumps over the lazy dog.\n")
	}
}

func BenchmarkURLNormalizerNoSpecials(b *testing.B) {
	for i := 0; i < b.N; i++ {
		urlNormalizer("http://example.com:80/foo?q=bar%20&baz=x+y#frag")
	}
}

func BenchmarkSrcsetFilter(b *testing.B) {
	for i := 0; i < b.N; i++ {
		srcsetFilterAndEscaper(" /foo/bar.png 200w, /baz/boo(1).png")
	}
}

func BenchmarkSrcsetFilterNoSpecials(b *testing.B) {
	for i := 0; i < b.N; i++ {
		srcsetFilterAndEscaper("http://example.com:80/foo?q=bar%20&baz=x+y#frag")
	}
}