mirror of
https://github.com/minio/minio.git
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140 lines
4.2 KiB
Go
140 lines
4.2 KiB
Go
/*
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* Minio Cloud Storage, (C) 2015 Minio, Inc.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package main
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import (
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"crypto/hmac"
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"encoding/hex"
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"io"
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"regexp"
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"strings"
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"unicode/utf8"
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"github.com/minio/minio/pkg/crypto/sha256"
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)
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///
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/// Excerpts from @lsegal - https://github.com/aws/aws-sdk-js/issues/659#issuecomment-120477258
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///
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/// User-Agent:
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///
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/// This is ignored from signing because signing this causes problems with generating pre-signed URLs
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/// (that are executed by other agents) or when customers pass requests through proxies, which may
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/// modify the user-agent.
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///
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/// Content-Length:
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///
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/// This is ignored from signing because generating a pre-signed URL should not provide a content-length
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/// constraint, specifically when vending a S3 pre-signed PUT URL. The corollary to this is that when
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/// sending regular requests (non-pre-signed), the signature contains a checksum of the body, which
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/// implicitly validates the payload length (since changing the number of bytes would change the checksum)
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/// and therefore this header is not valuable in the signature.
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///
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/// Content-Type:
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///
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/// Signing this header causes quite a number of problems in browser environments, where browsers
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/// like to modify and normalize the content-type header in different ways. There is more information
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/// on this in https://github.com/aws/aws-sdk-js/issues/244. Avoiding this field simplifies logic
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/// and reduces the possibility of future bugs
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///
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/// Authorization:
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///
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/// Is skipped for obvious reasons
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///
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var ignoredHeaders = map[string]bool{
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"Authorization": true,
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"Content-Type": true,
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"Content-Length": true,
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"User-Agent": true,
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}
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// sum256Reader calculate sha256 sum for an input read seeker
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func sum256Reader(reader io.ReadSeeker) ([]byte, error) {
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h := sha256.New()
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var err error
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start, _ := reader.Seek(0, 1)
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defer reader.Seek(start, 0)
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for err == nil {
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length := 0
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byteBuffer := make([]byte, 1024*1024)
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length, err = reader.Read(byteBuffer)
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byteBuffer = byteBuffer[0:length]
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h.Write(byteBuffer)
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}
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if err != io.EOF {
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return nil, err
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}
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return h.Sum(nil), nil
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}
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// sum256 calculate sha256 sum for an input byte array
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func sum256(data []byte) []byte {
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hash := sha256.New()
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hash.Write(data)
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return hash.Sum(nil)
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}
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// sumHMAC calculate hmac between two input byte array
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func sumHMAC(key []byte, data []byte) []byte {
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hash := hmac.New(sha256.New, key)
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hash.Write(data)
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return hash.Sum(nil)
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}
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// getURLEncodedName encode the strings from UTF-8 byte representations to HTML hex escape sequences
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//
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// This is necessary since regular url.Parse() and url.Encode() functions do not support UTF-8
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// non english characters cannot be parsed due to the nature in which url.Encode() is written
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//
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// This function on the other hand is a direct replacement for url.Encode() technique to support
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// pretty much every UTF-8 character.
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func getURLEncodedName(name string) string {
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// if object matches reserved string, no need to encode them
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reservedNames := regexp.MustCompile("^[a-zA-Z0-9-_.~/]+$")
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if reservedNames.MatchString(name) {
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return name
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}
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var encodedName string
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for _, s := range name {
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if 'A' <= s && s <= 'Z' || 'a' <= s && s <= 'z' || '0' <= s && s <= '9' { // §2.3 Unreserved characters (mark)
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encodedName = encodedName + string(s)
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continue
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}
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switch s {
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case '-', '_', '.', '~', '/': // §2.3 Unreserved characters (mark)
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encodedName = encodedName + string(s)
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continue
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default:
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len := utf8.RuneLen(s)
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if len < 0 {
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return name
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}
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u := make([]byte, len)
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utf8.EncodeRune(u, s)
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for _, r := range u {
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hex := hex.EncodeToString([]byte{r})
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encodedName = encodedName + "%" + strings.ToUpper(hex)
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}
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}
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}
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return encodedName
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}
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