// 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 (
"bytes"
"math"
"strings"
"testing"
)
func TestNextJsCtx(t *testing.T) {
tests := []struct {
jsCtx jsCtx
s string
}{
// Statement terminators precede regexps.
{jsCtxRegexp, ";"},
// This is not airtight.
// ({ valueOf: function () { return 1 } } / 2)
// is valid JavaScript but in practice, devs do not do this.
// A block followed by a statement starting with a RegExp is
// much more common:
// while (x) {...} /foo/.test(x) || panic()
{jsCtxRegexp, "}"},
// But member, call, grouping, and array expression terminators
// precede div ops.
{jsCtxDivOp, ")"},
{jsCtxDivOp, "]"},
// At the start of a primary expression, array, or expression
// statement, expect a regexp.
{jsCtxRegexp, "("},
{jsCtxRegexp, "["},
{jsCtxRegexp, "{"},
// Assignment operators precede regexps as do all exclusively
// prefix and binary operators.
{jsCtxRegexp, "="},
{jsCtxRegexp, "+="},
{jsCtxRegexp, "*="},
{jsCtxRegexp, "*"},
{jsCtxRegexp, "!"},
// Whether the + or - is infix or prefix, it cannot precede a
// div op.
{jsCtxRegexp, "+"},
{jsCtxRegexp, "-"},
// An incr/decr op precedes a div operator.
// This is not airtight. In (g = ++/h/i) a regexp follows a
// pre-increment operator, but in practice devs do not try to
// increment or decrement regular expressions.
// (g++/h/i) where ++ is a postfix operator on g is much more
// common.
{jsCtxDivOp, "--"},
{jsCtxDivOp, "++"},
{jsCtxDivOp, "x--"},
// When we have many dashes or pluses, then they are grouped
// left to right.
{jsCtxRegexp, "x---"}, // A postfix -- then a -.
// return followed by a slash returns the regexp literal or the
// slash starts a regexp literal in an expression statement that
// is dead code.
{jsCtxRegexp, "return"},
{jsCtxRegexp, "return "},
{jsCtxRegexp, "return\t"},
{jsCtxRegexp, "return\n"},
{jsCtxRegexp, "return\u2028"},
// Identifiers can be divided and cannot validly be preceded by
// a regular expressions. Semicolon insertion cannot happen
// between an identifier and a regular expression on a new line
// because the one token lookahead for semicolon insertion has
// to conclude that it could be a div binary op and treat it as
// such.
{jsCtxDivOp, "x"},
{jsCtxDivOp, "x "},
{jsCtxDivOp, "x\t"},
{jsCtxDivOp, "x\n"},
{jsCtxDivOp, "x\u2028"},
{jsCtxDivOp, "preturn"},
// Numbers precede div ops.
{jsCtxDivOp, "0"},
// Dots that are part of a number are div preceders.
{jsCtxDivOp, "0."},
}
for _, test := range tests {
if nextJSCtx([]byte(test.s), jsCtxRegexp) != test.jsCtx {
t.Errorf("want %s got %q", test.jsCtx, test.s)
}
if nextJSCtx([]byte(test.s), jsCtxDivOp) != test.jsCtx {
t.Errorf("want %s got %q", test.jsCtx, test.s)
}
}
if nextJSCtx([]byte(" "), jsCtxRegexp) != jsCtxRegexp {
t.Error("Blank tokens")
}
if nextJSCtx([]byte(" "), jsCtxDivOp) != jsCtxDivOp {
t.Error("Blank tokens")
}
}
func TestJSValEscaper(t *testing.T) {
tests := []struct {
x interface{}
js string
}{
{int(42), " 42 "},
{uint(42), " 42 "},
{int16(42), " 42 "},
{uint16(42), " 42 "},
{int32(-42), " -42 "},
{uint32(42), " 42 "},
{int16(-42), " -42 "},
{uint16(42), " 42 "},
{int64(-42), " -42 "},
{uint64(42), " 42 "},
{uint64(1) << 53, " 9007199254740992 "},
// ulp(1 << 53) > 1 so this loses precision in JS
// but it is still a representable integer literal.
{uint64(1)<<53 + 1, " 9007199254740993 "},
{float32(1.0), " 1 "},
{float32(-1.0), " -1 "},
{float32(0.5), " 0.5 "},
{float32(-0.5), " -0.5 "},
{float32(1.0) / float32(256), " 0.00390625 "},
{float32(0), " 0 "},
{math.Copysign(0, -1), " -0 "},
{float64(1.0), " 1 "},
{float64(-1.0), " -1 "},
{float64(0.5), " 0.5 "},
{float64(-0.5), " -0.5 "},
{float64(0), " 0 "},
{math.Copysign(0, -1), " -0 "},
{"", `""`},
{"foo", `"foo"`},
// Newlines.
{"\r\n\u2028\u2029", `"\r\n\u2028\u2029"`},
// "\v" == "v" on IE 6 so use "\x0b" instead.
{"\t\x0b", `"\t\u000b"`},
{struct{ X, Y int }{1, 2}, `{"X":1,"Y":2}`},
{[]interface{}{}, "[]"},
{[]interface{}{42, "foo", nil}, `[42,"foo",null]`},
{[]string{"<!--", "</script>", "-->"}, `["\u003c!--","\u003c/script\u003e","--\u003e"]`},
{"<!--", `"\u003c!--"`},
{"-->", `"--\u003e"`},
{"<![CDATA[", `"\u003c![CDATA["`},
{"]]>", `"]]\u003e"`},
{"</script", `"\u003c/script"`},
{"\U0001D11E", "\"\U0001D11E\""}, // or "\uD834\uDD1E"
{nil, " null "},
}
for _, test := range tests {
if js := jsValEscaper(test.x); js != test.js {
t.Errorf("%+v: want\n\t%q\ngot\n\t%q", test.x, test.js, js)
}
// Make sure that escaping corner cases are not broken
// by nesting.
a := []interface{}{test.x}
want := "[" + strings.TrimSpace(test.js) + "]"
if js := jsValEscaper(a); js != want {
t.Errorf("%+v: want\n\t%q\ngot\n\t%q", a, want, js)
}
}
}
func TestJSStrEscaper(t *testing.T) {
tests := []struct {
x interface{}
esc string
}{
{"", ``},
{"foo", `foo`},
{"\u0000", `\0`},
{"\t", `\t`},
{"\n", `\n`},
{"\r", `\r`},
{"\u2028", `\u2028`},
{"\u2029", `\u2029`},
{"\\", `\\`},
{"\\n", `\\n`},
{"foo\r\nbar", `foo\r\nbar`},
// Preserve attribute boundaries.
{`"`, `\x22`},
{`'`, `\x27`},
// Allow embedding in HTML without further escaping.
{`&`, `\x26amp;`},
// Prevent breaking out of text node and element boundaries.
{"</script>", `\x3c\/script\x3e`},
{"<![CDATA[", `\x3c![CDATA[`},
{"]]>", `]]\x3e`},
// https://dev.w3.org/html5/markup/aria/syntax.html#escaping-text-span
// "The text in style, script, title, and textarea elements
// must not have an escaping text span start that is not
// followed by an escaping text span end."
// Furthermore, spoofing an escaping text span end could lead
// to different interpretation of a </script> sequence otherwise
// masked by the escaping text span, and spoofing a start could
// allow regular text content to be interpreted as script
// allowing script execution via a combination of a JS string
// injection followed by an HTML text injection.
{"<!--", `\x3c!--`},
{"-->", `--\x3e`},
// From https://code.google.com/p/doctype/wiki/ArticleUtf7
{"+ADw-script+AD4-alert(1)+ADw-/script+AD4-",
`\x2bADw-script\x2bAD4-alert(1)\x2bADw-\/script\x2bAD4-`,
},
// Invalid UTF-8 sequence
{"foo\xA0bar", "foo\xA0bar"},
// Invalid unicode scalar value.
{"foo\xed\xa0\x80bar", "foo\xed\xa0\x80bar"},
}
for _, test := range tests {
esc := jsStrEscaper(test.x)
if esc != test.esc {
t.Errorf("%q: want %q got %q", test.x, test.esc, esc)
}
}
}
func TestJSRegexpEscaper(t *testing.T) {
tests := []struct {
x interface{}
esc string
}{
{"", `(?:)`},
{"foo", `foo`},
{"\u0000", `\0`},
{"\t", `\t`},
{"\n", `\n`},
{"\r", `\r`},
{"\u2028", `\u2028`},
{"\u2029", `\u2029`},
{"\\", `\\`},
{"\\n", `\\n`},
{"foo\r\nbar", `foo\r\nbar`},
// Preserve attribute boundaries.
{`"`, `\x22`},
{`'`, `\x27`},
// Allow embedding in HTML without further escaping.
{`&`, `\x26amp;`},
// Prevent breaking out of text node and element boundaries.
{"</script>", `\x3c\/script\x3e`},
{"<![CDATA[", `\x3c!\[CDATA\[`},
{"]]>", `\]\]\x3e`},
// Escaping text spans.
{"<!--", `\x3c!\-\-`},
{"-->", `\-\-\x3e`},
{"*", `\*`},
{"+", `\x2b`},
{"?", `\?`},
{"[](){}", `\[\]\(\)\{\}`},
{"$foo|x.y", `\$foo\|x\.y`},
{"x^y", `x\^y`},
}
for _, test := range tests {
esc := jsRegexpEscaper(test.x)
if esc != test.esc {
t.Errorf("%q: want %q got %q", test.x, test.esc, esc)
}
}
}
func TestEscapersOnLower7AndSelectHighCodepoints(t *testing.T) {
input := ("\x00\x01\x02\x03\x04\x05\x06\x07\x08\t\n\x0b\x0c\r\x0e\x0f" +
"\x10\x11\x12\x13\x14\x15\x16\x17\x18\x19\x1a\x1b\x1c\x1d\x1e\x1f" +
` !"#$%&'()*+,-./` +
`0123456789:;<=>?` +
`@ABCDEFGHIJKLMNO` +
`PQRSTUVWXYZ[\]^_` +
"`abcdefghijklmno" +
"pqrstuvwxyz{|}~\x7f" +
"\u00A0\u0100\u2028\u2029\ufeff\U0001D11E")
tests := []struct {
name string
escaper func(...interface{}) string
escaped string
}{
{
"jsStrEscaper",
jsStrEscaper,
"\\0\x01\x02\x03\x04\x05\x06\x07" +
"\x08\\t\\n\\x0b\\f\\r\x0E\x0F" +
"\x10\x11\x12\x13\x14\x15\x16\x17" +
"\x18\x19\x1a\x1b\x1c\x1d\x1e\x1f" +
` !\x22#$%\x26\x27()*\x2b,-.\/` +
`0123456789:;\x3c=\x3e?` +
`@ABCDEFGHIJKLMNO` +
`PQRSTUVWXYZ[\\]^_` +
"`abcdefghijklmno" +
"pqrstuvwxyz{|}~\x7f" +
"\u00A0\u0100\\u2028\\u2029\ufeff\U0001D11E",
},
{
"jsRegexpEscaper",
jsRegexpEscaper,
"\\0\x01\x02\x03\x04\x05\x06\x07" +
"\x08\\t\\n\\x0b\\f\\r\x0E\x0F" +
"\x10\x11\x12\x13\x14\x15\x16\x17" +
"\x18\x19\x1a\x1b\x1c\x1d\x1e\x1f" +
` !\x22#\$%\x26\x27\(\)\*\x2b,\-\.\/` +
`0123456789:;\x3c=\x3e\?` +
`@ABCDEFGHIJKLMNO` +
`PQRSTUVWXYZ\[\\\]\^_` +
"`abcdefghijklmno" +
`pqrstuvwxyz\{\|\}~` + "\u007f" +
"\u00A0\u0100\\u2028\\u2029\ufeff\U0001D11E",
},
}
for _, test := range tests {
if s := test.escaper(input); s != test.escaped {
t.Errorf("%s once: want\n\t%q\ngot\n\t%q", test.name, test.escaped, s)
continue
}
// Escape it rune by rune to make sure that any
// fast-path checking does not break escaping.
var buf bytes.Buffer
for _, c := range input {
buf.WriteString(test.escaper(string(c)))
}
if s := buf.String(); s != test.escaped {
t.Errorf("%s rune-wise: want\n\t%q\ngot\n\t%q", test.name, test.escaped, s)
continue
}
}
}
func TestIsJsMimeType(t *testing.T) {
tests := []struct {
in string
out bool
}{
{"application/javascript;version=1.8", true},
{"application/javascript;version=1.8;foo=bar", true},
{"application/javascript/version=1.8", false},
{"text/javascript", true},
{"application/json", true},
{"application/ld+json", true},
{"module", true},
}
for _, test := range tests {
if isJSType(test.in) != test.out {
t.Errorf("isJSType(%q) = %v, want %v", test.in, !test.out, test.out)
}
}
}
func BenchmarkJSValEscaperWithNum(b *testing.B) {
for i := 0; i < b.N; i++ {
jsValEscaper(3.141592654)
}
}
func BenchmarkJSValEscaperWithStr(b *testing.B) {
for i := 0; i < b.N; i++ {
jsValEscaper("The <i>quick</i>,\r\n<span style='color:brown'>brown</span> fox jumps\u2028over the <canine class=\"lazy\">dog</canine>")
}
}
func BenchmarkJSValEscaperWithStrNoSpecials(b *testing.B) {
for i := 0; i < b.N; i++ {
jsValEscaper("The quick, brown fox jumps over the lazy dog")
}
}
func BenchmarkJSValEscaperWithObj(b *testing.B) {
o := struct {
S string
N int
}{
"The <i>quick</i>,\r\n<span style='color:brown'>brown</span> fox jumps\u2028over the <canine class=\"lazy\">dog</canine>\u2028",
42,
}
for i := 0; i < b.N; i++ {
jsValEscaper(o)
}
}
func BenchmarkJSValEscaperWithObjNoSpecials(b *testing.B) {
o := struct {
S string
N int
}{
"The quick, brown fox jumps over the lazy dog",
42,
}
for i := 0; i < b.N; i++ {
jsValEscaper(o)
}
}
func BenchmarkJSStrEscaperNoSpecials(b *testing.B) {
for i := 0; i < b.N; i++ {
jsStrEscaper("The quick, brown fox jumps over the lazy dog.")
}
}
func BenchmarkJSStrEscaper(b *testing.B) {
for i := 0; i < b.N; i++ {
jsStrEscaper("The <i>quick</i>,\r\n<span style='color:brown'>brown</span> fox jumps\u2028over the <canine class=\"lazy\">dog</canine>")
}
}
func BenchmarkJSRegexpEscaperNoSpecials(b *testing.B) {
for i := 0; i < b.N; i++ {
jsRegexpEscaper("The quick, brown fox jumps over the lazy dog")
}
}
func BenchmarkJSRegexpEscaper(b *testing.B) {
for i := 0; i < b.N; i++ {
jsRegexpEscaper("The <i>quick</i>,\r\n<span style='color:brown'>brown</span> fox jumps\u2028over the <canine class=\"lazy\">dog</canine>")
}
}
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