199 lines
4.1 KiB
Go
199 lines
4.1 KiB
Go
// Copyright 2016 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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// Copied and modified from Go 1.8 stdlib's encoding/json/#safeSet
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package json
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import (
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"bytes"
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"unicode/utf8"
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)
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// safeSet holds the value true if the ASCII character with the given array
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// position can be represented inside a JSON string without any further
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// escaping.
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//
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// All values are true except for the ASCII control characters (0-31), the
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// double quote ("), and the backslash character ("\").
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var safeSet = [utf8.RuneSelf]bool{
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' ': true,
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'!': true,
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'"': false,
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'#': true,
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'$': true,
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'%': true,
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'&': true,
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'\'': true,
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'(': true,
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')': true,
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'*': true,
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'+': true,
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',': true,
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'-': true,
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'.': true,
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'/': true,
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'0': true,
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'1': true,
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'2': true,
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'3': true,
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'4': true,
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'5': true,
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'6': true,
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'7': true,
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'8': true,
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'9': true,
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':': true,
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';': true,
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'<': true,
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'=': true,
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'>': true,
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'?': true,
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'@': true,
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'A': true,
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'B': true,
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'C': true,
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'D': true,
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'E': true,
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'F': true,
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'G': true,
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'H': true,
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'I': true,
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'J': true,
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'K': true,
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'L': true,
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'M': true,
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'N': true,
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'O': true,
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'P': true,
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'Q': true,
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'R': true,
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'S': true,
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'T': true,
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'U': true,
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'V': true,
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'W': true,
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'X': true,
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'Y': true,
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'Z': true,
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'[': true,
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'\\': false,
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']': true,
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'^': true,
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'_': true,
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'`': true,
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'a': true,
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'b': true,
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'c': true,
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'd': true,
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'e': true,
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'f': true,
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'g': true,
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'h': true,
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'i': true,
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'j': true,
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'k': true,
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'l': true,
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'm': true,
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'n': true,
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'o': true,
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'p': true,
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'q': true,
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'r': true,
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's': true,
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't': true,
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'u': true,
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'v': true,
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'w': true,
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'x': true,
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'y': true,
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'z': true,
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'{': true,
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'|': true,
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'}': true,
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'~': true,
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'\u007f': true,
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}
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// copied from Go 1.8 stdlib's encoding/json/#hex
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var hex = "0123456789abcdef"
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// escapeStringBytes escapes and writes the passed in string bytes to the dst
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// buffer
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//
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// Copied and modifed from Go 1.8 stdlib's encodeing/json/#encodeState.stringBytes
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func escapeStringBytes(e *bytes.Buffer, s []byte) {
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e.WriteByte('"')
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start := 0
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for i := 0; i < len(s); {
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if b := s[i]; b < utf8.RuneSelf {
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if safeSet[b] {
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i++
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continue
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}
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if start < i {
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e.Write(s[start:i])
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}
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switch b {
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case '\\', '"':
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e.WriteByte('\\')
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e.WriteByte(b)
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case '\n':
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e.WriteByte('\\')
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e.WriteByte('n')
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case '\r':
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e.WriteByte('\\')
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e.WriteByte('r')
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case '\t':
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e.WriteByte('\\')
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e.WriteByte('t')
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default:
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// This encodes bytes < 0x20 except for \t, \n and \r.
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// If escapeHTML is set, it also escapes <, >, and &
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// because they can lead to security holes when
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// user-controlled strings are rendered into JSON
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// and served to some browsers.
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e.WriteString(`\u00`)
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e.WriteByte(hex[b>>4])
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e.WriteByte(hex[b&0xF])
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}
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i++
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start = i
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continue
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}
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c, size := utf8.DecodeRune(s[i:])
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if c == utf8.RuneError && size == 1 {
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if start < i {
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e.Write(s[start:i])
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}
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e.WriteString(`\ufffd`)
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i += size
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start = i
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continue
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}
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// U+2028 is LINE SEPARATOR.
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// U+2029 is PARAGRAPH SEPARATOR.
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// They are both technically valid characters in JSON strings,
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// but don't work in JSONP, which has to be evaluated as JavaScript,
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// and can lead to security holes there. It is valid JSON to
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// escape them, so we do so unconditionally.
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// See http://timelessrepo.com/json-isnt-a-javascript-subset for discussion.
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if c == '\u2028' || c == '\u2029' {
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if start < i {
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e.Write(s[start:i])
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}
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e.WriteString(`\u202`)
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e.WriteByte(hex[c&0xF])
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i += size
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start = i
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continue
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}
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i += size
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}
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if start < len(s) {
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e.Write(s[start:])
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}
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e.WriteByte('"')
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}
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