43 lines
885 B
Go
43 lines
885 B
Go
// based on https://github.com/golang/go/blob/master/src/net/url/url.go
|
|
// Copyright 2009 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 util
|
|
|
|
func shouldEscape(c byte) bool {
|
|
if 'A' <= c && c <= 'Z' || 'a' <= c && c <= 'z' || '0' <= c && c <= '9' || c == '_' || c == '-' || c == '~' || c == '.' {
|
|
return false
|
|
}
|
|
return true
|
|
}
|
|
func escape(s string) string {
|
|
hexCount := 0
|
|
for i := 0; i < len(s); i++ {
|
|
c := s[i]
|
|
if shouldEscape(c) {
|
|
hexCount++
|
|
}
|
|
}
|
|
|
|
if hexCount == 0 {
|
|
return s
|
|
}
|
|
|
|
t := make([]byte, len(s)+2*hexCount)
|
|
j := 0
|
|
for i := 0; i < len(s); i++ {
|
|
switch c := s[i]; {
|
|
case shouldEscape(c):
|
|
t[j] = '%'
|
|
t[j+1] = "0123456789ABCDEF"[c>>4]
|
|
t[j+2] = "0123456789ABCDEF"[c&15]
|
|
j += 3
|
|
default:
|
|
t[j] = s[i]
|
|
j++
|
|
}
|
|
}
|
|
return string(t)
|
|
}
|