mirror of
https://github.com/cwinfo/matterbridge.git
synced 2024-11-10 09:50:27 +00:00
54 lines
1.4 KiB
Go
54 lines
1.4 KiB
Go
|
// Copyright 2015 The 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 mdurl
|
||
|
|
|
||
|
|
import (
|
||
|
|
"bytes"
|
||
|
|
"strings"
|
||
|
|
"unicode/utf8"
|
||
|
|
)
|
||
|
|
|
||
|
|
// Encode percent-encodes rawurl, avoiding double encoding.
|
||
|
|
// It doesn't touch:
|
||
|
|
// - alphanumeric characters ([0-9a-zA-Z]);
|
||
|
|
// - percent-encoded characters (%[0-9a-fA-F]{2});
|
||
|
|
// - excluded characters ([;/?:@&=+$,-_.!~*'()#]).
|
||
|
|
// Invalid UTF-8 sequences are replaced with U+FFFD.
|
||
|
|
func Encode(rawurl string) string {
|
||
|
|
const hexdigit = "0123456789ABCDEF"
|
||
|
|
var buf bytes.Buffer
|
||
|
|
i := 0
|
||
|
|
for i < len(rawurl) {
|
||
|
|
r, rlen := utf8.DecodeRuneInString(rawurl[i:])
|
||
|
|
if r >= 0x80 {
|
||
|
|
for j, n := i, i+rlen; j < n; j++ {
|
||
|
|
b := rawurl[j]
|
||
|
|
buf.WriteByte('%')
|
||
|
|
buf.WriteByte(hexdigit[(b>>4)&0xf])
|
||
|
|
buf.WriteByte(hexdigit[b&0xf])
|
||
|
|
}
|
||
|
|
} else if r == '%' {
|
||
|
|
if i+2 < len(rawurl) &&
|
||
|
|
hexDigit(rawurl[i+1]) &&
|
||
|
|
hexDigit(rawurl[i+2]) {
|
||
|
|
buf.WriteByte('%')
|
||
|
|
buf.WriteByte(byteToUpper(rawurl[i+1]))
|
||
|
|
buf.WriteByte(byteToUpper(rawurl[i+2]))
|
||
|
|
i += 2
|
||
|
|
} else {
|
||
|
|
buf.WriteString("%25")
|
||
|
|
}
|
||
|
|
} else if strings.IndexByte("!#$&'()*+,-./0123456789:;=?@ABCDEFGHIJKLMNOPQRSTUVWXYZ_abcdefghijklmnopqrstuvwxyz~", byte(r)) == -1 {
|
||
|
|
buf.WriteByte('%')
|
||
|
|
buf.WriteByte(hexdigit[(r>>4)&0xf])
|
||
|
|
buf.WriteByte(hexdigit[r&0xf])
|
||
|
|
} else {
|
||
|
|
buf.WriteByte(byte(r))
|
||
|
|
}
|
||
|
|
i += rlen
|
||
|
|
}
|
||
|
|
return buf.String()
|
||
|
|
}
|