109 lines
2.3 KiB
Go
109 lines
2.3 KiB
Go
// Copyright (c) 2015-2021 MinIO, Inc.
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//
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// This file is part of MinIO Object Storage stack
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//
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// This program is free software: you can redistribute it and/or modify
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// it under the terms of the GNU Affero General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// This program is distributed in the hope that it will be useful
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU Affero General Public License for more details.
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//
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// You should have received a copy of the GNU Affero General Public License
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// along with this program. If not, see <http://www.gnu.org/licenses/>.
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package cmd
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import (
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"strings"
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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 Golang's url.QueryEscape() code,
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// while considering some S3 exceptions:
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// - Avoid encoding '/' and '*'
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// - Force encoding of '~'
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func s3URLEncode(s string) 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 == ' ' {
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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 == ' ':
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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] = "0123456789ABCDEF"[c>>4]
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t[j+2] = "0123456789ABCDEF"[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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// s3EncodeName encodes string in response when encodingType is specified in AWS S3 requests.
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func s3EncodeName(name string, encodingType string) (result string) {
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// Quick path to exit
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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 "url":
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return s3URLEncode(name)
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}
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return name
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}
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