mirror of
https://github.com/go-gitea/gitea
synced 2024-11-19 16:44:25 +00:00
641 lines
11 KiB
Go
Vendored
641 lines
11 KiB
Go
Vendored
package encoder
|
|
|
|
import (
|
|
"math/bits"
|
|
"reflect"
|
|
"unicode/utf8"
|
|
"unsafe"
|
|
)
|
|
|
|
const (
|
|
lsb = 0x0101010101010101
|
|
msb = 0x8080808080808080
|
|
)
|
|
|
|
var needEscapeWithHTML = [256]bool{
|
|
'"': true,
|
|
'&': true,
|
|
'<': true,
|
|
'>': true,
|
|
'\\': true,
|
|
0x00: true,
|
|
0x01: true,
|
|
0x02: true,
|
|
0x03: true,
|
|
0x04: true,
|
|
0x05: true,
|
|
0x06: true,
|
|
0x07: true,
|
|
0x08: true,
|
|
0x09: true,
|
|
0x0a: true,
|
|
0x0b: true,
|
|
0x0c: true,
|
|
0x0d: true,
|
|
0x0e: true,
|
|
0x0f: true,
|
|
0x10: true,
|
|
0x11: true,
|
|
0x12: true,
|
|
0x13: true,
|
|
0x14: true,
|
|
0x15: true,
|
|
0x16: true,
|
|
0x17: true,
|
|
0x18: true,
|
|
0x19: true,
|
|
0x1a: true,
|
|
0x1b: true,
|
|
0x1c: true,
|
|
0x1d: true,
|
|
0x1e: true,
|
|
0x1f: true,
|
|
/* 0x20 - 0x7f */
|
|
0x80: true,
|
|
0x81: true,
|
|
0x82: true,
|
|
0x83: true,
|
|
0x84: true,
|
|
0x85: true,
|
|
0x86: true,
|
|
0x87: true,
|
|
0x88: true,
|
|
0x89: true,
|
|
0x8a: true,
|
|
0x8b: true,
|
|
0x8c: true,
|
|
0x8d: true,
|
|
0x8e: true,
|
|
0x8f: true,
|
|
0x90: true,
|
|
0x91: true,
|
|
0x92: true,
|
|
0x93: true,
|
|
0x94: true,
|
|
0x95: true,
|
|
0x96: true,
|
|
0x97: true,
|
|
0x98: true,
|
|
0x99: true,
|
|
0x9a: true,
|
|
0x9b: true,
|
|
0x9c: true,
|
|
0x9d: true,
|
|
0x9e: true,
|
|
0x9f: true,
|
|
0xa0: true,
|
|
0xa1: true,
|
|
0xa2: true,
|
|
0xa3: true,
|
|
0xa4: true,
|
|
0xa5: true,
|
|
0xa6: true,
|
|
0xa7: true,
|
|
0xa8: true,
|
|
0xa9: true,
|
|
0xaa: true,
|
|
0xab: true,
|
|
0xac: true,
|
|
0xad: true,
|
|
0xae: true,
|
|
0xaf: true,
|
|
0xb0: true,
|
|
0xb1: true,
|
|
0xb2: true,
|
|
0xb3: true,
|
|
0xb4: true,
|
|
0xb5: true,
|
|
0xb6: true,
|
|
0xb7: true,
|
|
0xb8: true,
|
|
0xb9: true,
|
|
0xba: true,
|
|
0xbb: true,
|
|
0xbc: true,
|
|
0xbd: true,
|
|
0xbe: true,
|
|
0xbf: true,
|
|
0xc0: true,
|
|
0xc1: true,
|
|
0xc2: true,
|
|
0xc3: true,
|
|
0xc4: true,
|
|
0xc5: true,
|
|
0xc6: true,
|
|
0xc7: true,
|
|
0xc8: true,
|
|
0xc9: true,
|
|
0xca: true,
|
|
0xcb: true,
|
|
0xcc: true,
|
|
0xcd: true,
|
|
0xce: true,
|
|
0xcf: true,
|
|
0xd0: true,
|
|
0xd1: true,
|
|
0xd2: true,
|
|
0xd3: true,
|
|
0xd4: true,
|
|
0xd5: true,
|
|
0xd6: true,
|
|
0xd7: true,
|
|
0xd8: true,
|
|
0xd9: true,
|
|
0xda: true,
|
|
0xdb: true,
|
|
0xdc: true,
|
|
0xdd: true,
|
|
0xde: true,
|
|
0xdf: true,
|
|
0xe0: true,
|
|
0xe1: true,
|
|
0xe2: true,
|
|
0xe3: true,
|
|
0xe4: true,
|
|
0xe5: true,
|
|
0xe6: true,
|
|
0xe7: true,
|
|
0xe8: true,
|
|
0xe9: true,
|
|
0xea: true,
|
|
0xeb: true,
|
|
0xec: true,
|
|
0xed: true,
|
|
0xee: true,
|
|
0xef: true,
|
|
0xf0: true,
|
|
0xf1: true,
|
|
0xf2: true,
|
|
0xf3: true,
|
|
0xf4: true,
|
|
0xf5: true,
|
|
0xf6: true,
|
|
0xf7: true,
|
|
0xf8: true,
|
|
0xf9: true,
|
|
0xfa: true,
|
|
0xfb: true,
|
|
0xfc: true,
|
|
0xfd: true,
|
|
0xfe: true,
|
|
0xff: true,
|
|
}
|
|
|
|
var needEscape = [256]bool{
|
|
'"': true,
|
|
'\\': true,
|
|
0x00: true,
|
|
0x01: true,
|
|
0x02: true,
|
|
0x03: true,
|
|
0x04: true,
|
|
0x05: true,
|
|
0x06: true,
|
|
0x07: true,
|
|
0x08: true,
|
|
0x09: true,
|
|
0x0a: true,
|
|
0x0b: true,
|
|
0x0c: true,
|
|
0x0d: true,
|
|
0x0e: true,
|
|
0x0f: true,
|
|
0x10: true,
|
|
0x11: true,
|
|
0x12: true,
|
|
0x13: true,
|
|
0x14: true,
|
|
0x15: true,
|
|
0x16: true,
|
|
0x17: true,
|
|
0x18: true,
|
|
0x19: true,
|
|
0x1a: true,
|
|
0x1b: true,
|
|
0x1c: true,
|
|
0x1d: true,
|
|
0x1e: true,
|
|
0x1f: true,
|
|
/* 0x20 - 0x7f */
|
|
0x80: true,
|
|
0x81: true,
|
|
0x82: true,
|
|
0x83: true,
|
|
0x84: true,
|
|
0x85: true,
|
|
0x86: true,
|
|
0x87: true,
|
|
0x88: true,
|
|
0x89: true,
|
|
0x8a: true,
|
|
0x8b: true,
|
|
0x8c: true,
|
|
0x8d: true,
|
|
0x8e: true,
|
|
0x8f: true,
|
|
0x90: true,
|
|
0x91: true,
|
|
0x92: true,
|
|
0x93: true,
|
|
0x94: true,
|
|
0x95: true,
|
|
0x96: true,
|
|
0x97: true,
|
|
0x98: true,
|
|
0x99: true,
|
|
0x9a: true,
|
|
0x9b: true,
|
|
0x9c: true,
|
|
0x9d: true,
|
|
0x9e: true,
|
|
0x9f: true,
|
|
0xa0: true,
|
|
0xa1: true,
|
|
0xa2: true,
|
|
0xa3: true,
|
|
0xa4: true,
|
|
0xa5: true,
|
|
0xa6: true,
|
|
0xa7: true,
|
|
0xa8: true,
|
|
0xa9: true,
|
|
0xaa: true,
|
|
0xab: true,
|
|
0xac: true,
|
|
0xad: true,
|
|
0xae: true,
|
|
0xaf: true,
|
|
0xb0: true,
|
|
0xb1: true,
|
|
0xb2: true,
|
|
0xb3: true,
|
|
0xb4: true,
|
|
0xb5: true,
|
|
0xb6: true,
|
|
0xb7: true,
|
|
0xb8: true,
|
|
0xb9: true,
|
|
0xba: true,
|
|
0xbb: true,
|
|
0xbc: true,
|
|
0xbd: true,
|
|
0xbe: true,
|
|
0xbf: true,
|
|
0xc0: true,
|
|
0xc1: true,
|
|
0xc2: true,
|
|
0xc3: true,
|
|
0xc4: true,
|
|
0xc5: true,
|
|
0xc6: true,
|
|
0xc7: true,
|
|
0xc8: true,
|
|
0xc9: true,
|
|
0xca: true,
|
|
0xcb: true,
|
|
0xcc: true,
|
|
0xcd: true,
|
|
0xce: true,
|
|
0xcf: true,
|
|
0xd0: true,
|
|
0xd1: true,
|
|
0xd2: true,
|
|
0xd3: true,
|
|
0xd4: true,
|
|
0xd5: true,
|
|
0xd6: true,
|
|
0xd7: true,
|
|
0xd8: true,
|
|
0xd9: true,
|
|
0xda: true,
|
|
0xdb: true,
|
|
0xdc: true,
|
|
0xdd: true,
|
|
0xde: true,
|
|
0xdf: true,
|
|
0xe0: true,
|
|
0xe1: true,
|
|
0xe2: true,
|
|
0xe3: true,
|
|
0xe4: true,
|
|
0xe5: true,
|
|
0xe6: true,
|
|
0xe7: true,
|
|
0xe8: true,
|
|
0xe9: true,
|
|
0xea: true,
|
|
0xeb: true,
|
|
0xec: true,
|
|
0xed: true,
|
|
0xee: true,
|
|
0xef: true,
|
|
0xf0: true,
|
|
0xf1: true,
|
|
0xf2: true,
|
|
0xf3: true,
|
|
0xf4: true,
|
|
0xf5: true,
|
|
0xf6: true,
|
|
0xf7: true,
|
|
0xf8: true,
|
|
0xf9: true,
|
|
0xfa: true,
|
|
0xfb: true,
|
|
0xfc: true,
|
|
0xfd: true,
|
|
0xfe: true,
|
|
0xff: true,
|
|
}
|
|
|
|
var hex = "0123456789abcdef"
|
|
|
|
// escapeIndex finds the index of the first char in `s` that requires escaping.
|
|
// A char requires escaping if it's outside of the range of [0x20, 0x7F] or if
|
|
// it includes a double quote or backslash.
|
|
// If no chars in `s` require escaping, the return value is -1.
|
|
func escapeIndex(s string) int {
|
|
chunks := stringToUint64Slice(s)
|
|
for _, n := range chunks {
|
|
// combine masks before checking for the MSB of each byte. We include
|
|
// `n` in the mask to check whether any of the *input* byte MSBs were
|
|
// set (i.e. the byte was outside the ASCII range).
|
|
mask := n | below(n, 0x20) | contains(n, '"') | contains(n, '\\')
|
|
if (mask & msb) != 0 {
|
|
return bits.TrailingZeros64(mask&msb) / 8
|
|
}
|
|
}
|
|
|
|
valLen := len(s)
|
|
for i := len(chunks) * 8; i < valLen; i++ {
|
|
if needEscape[s[i]] {
|
|
return i
|
|
}
|
|
}
|
|
|
|
return -1
|
|
}
|
|
|
|
// below return a mask that can be used to determine if any of the bytes
|
|
// in `n` are below `b`. If a byte's MSB is set in the mask then that byte was
|
|
// below `b`. The result is only valid if `b`, and each byte in `n`, is below
|
|
// 0x80.
|
|
func below(n uint64, b byte) uint64 {
|
|
return n - expand(b)
|
|
}
|
|
|
|
// contains returns a mask that can be used to determine if any of the
|
|
// bytes in `n` are equal to `b`. If a byte's MSB is set in the mask then
|
|
// that byte is equal to `b`. The result is only valid if `b`, and each
|
|
// byte in `n`, is below 0x80.
|
|
func contains(n uint64, b byte) uint64 {
|
|
return (n ^ expand(b)) - lsb
|
|
}
|
|
|
|
// expand puts the specified byte into each of the 8 bytes of a uint64.
|
|
func expand(b byte) uint64 {
|
|
return lsb * uint64(b)
|
|
}
|
|
|
|
//nolint:govet
|
|
func stringToUint64Slice(s string) []uint64 {
|
|
return *(*[]uint64)(unsafe.Pointer(&reflect.SliceHeader{
|
|
Data: ((*reflect.StringHeader)(unsafe.Pointer(&s))).Data,
|
|
Len: len(s) / 8,
|
|
Cap: len(s) / 8,
|
|
}))
|
|
}
|
|
|
|
func AppendString(ctx *RuntimeContext, buf []byte, s string) []byte {
|
|
if ctx.Option.Flag&HTMLEscapeOption == 0 {
|
|
return appendString(buf, s)
|
|
}
|
|
valLen := len(s)
|
|
if valLen == 0 {
|
|
return append(buf, `""`...)
|
|
}
|
|
buf = append(buf, '"')
|
|
var (
|
|
i, j int
|
|
)
|
|
if valLen >= 8 {
|
|
chunks := stringToUint64Slice(s)
|
|
for _, n := range chunks {
|
|
// combine masks before checking for the MSB of each byte. We include
|
|
// `n` in the mask to check whether any of the *input* byte MSBs were
|
|
// set (i.e. the byte was outside the ASCII range).
|
|
mask := n | (n - (lsb * 0x20)) |
|
|
((n ^ (lsb * '"')) - lsb) |
|
|
((n ^ (lsb * '\\')) - lsb) |
|
|
((n ^ (lsb * '<')) - lsb) |
|
|
((n ^ (lsb * '>')) - lsb) |
|
|
((n ^ (lsb * '&')) - lsb)
|
|
if (mask & msb) != 0 {
|
|
j = bits.TrailingZeros64(mask&msb) / 8
|
|
goto ESCAPE_END
|
|
}
|
|
}
|
|
for i := len(chunks) * 8; i < valLen; i++ {
|
|
if needEscapeWithHTML[s[i]] {
|
|
j = i
|
|
goto ESCAPE_END
|
|
}
|
|
}
|
|
// no found any escape characters.
|
|
return append(append(buf, s...), '"')
|
|
}
|
|
ESCAPE_END:
|
|
for j < valLen {
|
|
c := s[j]
|
|
|
|
if !needEscapeWithHTML[c] {
|
|
// fast path: most of the time, printable ascii characters are used
|
|
j++
|
|
continue
|
|
}
|
|
|
|
switch c {
|
|
case '\\', '"':
|
|
buf = append(buf, s[i:j]...)
|
|
buf = append(buf, '\\', c)
|
|
i = j + 1
|
|
j = j + 1
|
|
continue
|
|
|
|
case '\n':
|
|
buf = append(buf, s[i:j]...)
|
|
buf = append(buf, '\\', 'n')
|
|
i = j + 1
|
|
j = j + 1
|
|
continue
|
|
|
|
case '\r':
|
|
buf = append(buf, s[i:j]...)
|
|
buf = append(buf, '\\', 'r')
|
|
i = j + 1
|
|
j = j + 1
|
|
continue
|
|
|
|
case '\t':
|
|
buf = append(buf, s[i:j]...)
|
|
buf = append(buf, '\\', 't')
|
|
i = j + 1
|
|
j = j + 1
|
|
continue
|
|
|
|
case '<', '>', '&':
|
|
buf = append(buf, s[i:j]...)
|
|
buf = append(buf, `\u00`...)
|
|
buf = append(buf, hex[c>>4], hex[c&0xF])
|
|
i = j + 1
|
|
j = j + 1
|
|
continue
|
|
}
|
|
|
|
// This encodes bytes < 0x20 except for \t, \n and \r.
|
|
if c < 0x20 {
|
|
buf = append(buf, s[i:j]...)
|
|
buf = append(buf, `\u00`...)
|
|
buf = append(buf, hex[c>>4], hex[c&0xF])
|
|
i = j + 1
|
|
j = j + 1
|
|
continue
|
|
}
|
|
|
|
r, size := utf8.DecodeRuneInString(s[j:])
|
|
|
|
if r == utf8.RuneError && size == 1 {
|
|
buf = append(buf, s[i:j]...)
|
|
buf = append(buf, `\ufffd`...)
|
|
i = j + size
|
|
j = j + size
|
|
continue
|
|
}
|
|
|
|
switch r {
|
|
case '\u2028', '\u2029':
|
|
// U+2028 is LINE SEPARATOR.
|
|
// U+2029 is PARAGRAPH SEPARATOR.
|
|
// They are both technically valid characters in JSON strings,
|
|
// but don't work in JSONP, which has to be evaluated as JavaScript,
|
|
// and can lead to security holes there. It is valid JSON to
|
|
// escape them, so we do so unconditionally.
|
|
// See http://timelessrepo.com/json-isnt-a-javascript-subset for discussion.
|
|
buf = append(buf, s[i:j]...)
|
|
buf = append(buf, `\u202`...)
|
|
buf = append(buf, hex[r&0xF])
|
|
i = j + size
|
|
j = j + size
|
|
continue
|
|
}
|
|
|
|
j += size
|
|
}
|
|
|
|
return append(append(buf, s[i:]...), '"')
|
|
}
|
|
|
|
func appendString(buf []byte, s string) []byte {
|
|
valLen := len(s)
|
|
if valLen == 0 {
|
|
return append(buf, `""`...)
|
|
}
|
|
buf = append(buf, '"')
|
|
var escapeIdx int
|
|
if valLen >= 8 {
|
|
if escapeIdx = escapeIndex(s); escapeIdx < 0 {
|
|
return append(append(buf, s...), '"')
|
|
}
|
|
}
|
|
|
|
i := 0
|
|
j := escapeIdx
|
|
for j < valLen {
|
|
c := s[j]
|
|
|
|
if c >= 0x20 && c <= 0x7f && c != '\\' && c != '"' {
|
|
// fast path: most of the time, printable ascii characters are used
|
|
j++
|
|
continue
|
|
}
|
|
|
|
switch c {
|
|
case '\\', '"':
|
|
buf = append(buf, s[i:j]...)
|
|
buf = append(buf, '\\', c)
|
|
i = j + 1
|
|
j = j + 1
|
|
continue
|
|
|
|
case '\n':
|
|
buf = append(buf, s[i:j]...)
|
|
buf = append(buf, '\\', 'n')
|
|
i = j + 1
|
|
j = j + 1
|
|
continue
|
|
|
|
case '\r':
|
|
buf = append(buf, s[i:j]...)
|
|
buf = append(buf, '\\', 'r')
|
|
i = j + 1
|
|
j = j + 1
|
|
continue
|
|
|
|
case '\t':
|
|
buf = append(buf, s[i:j]...)
|
|
buf = append(buf, '\\', 't')
|
|
i = j + 1
|
|
j = j + 1
|
|
continue
|
|
|
|
case '<', '>', '&':
|
|
buf = append(buf, s[i:j]...)
|
|
buf = append(buf, `\u00`...)
|
|
buf = append(buf, hex[c>>4], hex[c&0xF])
|
|
i = j + 1
|
|
j = j + 1
|
|
continue
|
|
}
|
|
|
|
// This encodes bytes < 0x20 except for \t, \n and \r.
|
|
if c < 0x20 {
|
|
buf = append(buf, s[i:j]...)
|
|
buf = append(buf, `\u00`...)
|
|
buf = append(buf, hex[c>>4], hex[c&0xF])
|
|
i = j + 1
|
|
j = j + 1
|
|
continue
|
|
}
|
|
|
|
r, size := utf8.DecodeRuneInString(s[j:])
|
|
|
|
if r == utf8.RuneError && size == 1 {
|
|
buf = append(buf, s[i:j]...)
|
|
buf = append(buf, `\ufffd`...)
|
|
i = j + size
|
|
j = j + size
|
|
continue
|
|
}
|
|
|
|
switch r {
|
|
case '\u2028', '\u2029':
|
|
// U+2028 is LINE SEPARATOR.
|
|
// U+2029 is PARAGRAPH SEPARATOR.
|
|
// They are both technically valid characters in JSON strings,
|
|
// but don't work in JSONP, which has to be evaluated as JavaScript,
|
|
// and can lead to security holes there. It is valid JSON to
|
|
// escape them, so we do so unconditionally.
|
|
// See http://timelessrepo.com/json-isnt-a-javascript-subset for discussion.
|
|
buf = append(buf, s[i:j]...)
|
|
buf = append(buf, `\u202`...)
|
|
buf = append(buf, hex[r&0xF])
|
|
i = j + size
|
|
j = j + size
|
|
continue
|
|
}
|
|
|
|
j += size
|
|
}
|
|
|
|
return append(append(buf, s[i:]...), '"')
|
|
}
|