120 lines
3.8 KiB
Go
120 lines
3.8 KiB
Go
/*
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* Minio Cloud Storage, (C) 2015, 2016 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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"crypto/sha256"
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"encoding/hex"
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"net/http"
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"regexp"
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"strings"
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"unicode/utf8"
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)
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// isValidRegion - verify if incoming region value is valid with configured Region.
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func isValidRegion(reqRegion string, confRegion string) bool {
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if confRegion == "" || confRegion == "US" {
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confRegion = "us-east-1"
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}
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// Some older s3 clients set region as "US" instead of
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// "us-east-1", handle it.
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if reqRegion == "US" {
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reqRegion = "us-east-1"
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}
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return reqRegion == confRegion
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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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// extractSignedHeaders extract signed headers from Authorization header
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func extractSignedHeaders(signedHeaders []string, reqHeaders http.Header) http.Header {
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extractedSignedHeaders := make(http.Header)
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for _, header := range signedHeaders {
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val, ok := reqHeaders[http.CanonicalHeaderKey(header)]
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if !ok {
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// Golang http server strips off 'Expect' header, if the
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// client sent this as part of signed headers we need to
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// handle otherwise we would see a signature mismatch.
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// `aws-cli` sets this as part of signed headers.
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//
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// According to
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// http://www.w3.org/Protocols/rfc2616/rfc2616-sec14.html#sec14.20
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// Expect header is always of form:
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//
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// Expect = "Expect" ":" 1#expectation
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// expectation = "100-continue" | expectation-extension
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//
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// So it safe to assume that '100-continue' is what would
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// be sent, for the time being keep this work around.
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// Adding a *TODO* to remove this later when Golang server
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// doesn't filter out the 'Expect' header.
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if header == "expect" {
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extractedSignedHeaders[header] = []string{"100-continue"}
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}
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// If not found continue, we will fail later.
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continue
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}
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extractedSignedHeaders[header] = val
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}
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return extractedSignedHeaders
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}
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