112 lines
1.9 KiB
Go
112 lines
1.9 KiB
Go
package handler
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import (
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"strings"
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)
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type encoding int
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const (
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encodePathSegment encoding = iota
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encodeQueryComponent
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)
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const (
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urlEncodingType = "url"
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upperhex = "0123456789ABCDEF"
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)
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func shouldEscape(c byte) bool {
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if 'A' <= c && c <= 'Z' || 'a' <= c && c <= 'z' || '0' <= c && c <= '9' {
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return false
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}
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switch c {
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case '-', '_', '.', '/', '*':
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return false
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}
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return true
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}
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// s3URLEncode is based on url.QueryEscape() code
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// while considering some S3 exceptions.
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func s3URLEncode(s string, mode encoding) string {
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spaceCount, hexCount := 0, 0
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for i := 0; i < len(s); i++ {
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c := s[i]
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if shouldEscape(c) {
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if c == ' ' && mode == encodeQueryComponent {
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spaceCount++
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} else {
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hexCount++
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}
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}
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}
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if spaceCount == 0 && hexCount == 0 {
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return s
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}
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var buf [64]byte
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var t []byte
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required := len(s) + 2*hexCount
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if required <= len(buf) {
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t = buf[:required]
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} else {
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t = make([]byte, required)
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}
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if hexCount == 0 {
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copy(t, s)
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for i := 0; i < len(s); i++ {
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if s[i] == ' ' {
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t[i] = '+'
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}
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}
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return string(t)
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}
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j := 0
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for i := 0; i < len(s); i++ {
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switch c := s[i]; {
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case c == ' ' && mode == encodeQueryComponent:
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t[j] = '+'
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j++
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case shouldEscape(c):
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t[j] = '%'
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t[j+1] = upperhex[c>>4]
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t[j+2] = upperhex[c&15]
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j += 3
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default:
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t[j] = s[i]
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j++
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}
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}
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return string(t)
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}
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func s3QueryEncode(name string, encodingType string) (result string) {
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if encodingType == "" {
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return name
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}
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encodingType = strings.ToLower(encodingType)
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switch encodingType {
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case urlEncodingType:
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return s3URLEncode(name, encodeQueryComponent)
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}
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return name
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}
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func s3PathEncode(name string, encodingType string) (result string) {
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if encodingType == "" {
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return name
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}
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encodingType = strings.ToLower(encodingType)
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switch encodingType {
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case urlEncodingType:
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return s3URLEncode(name, encodePathSegment)
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}
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return name
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}
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