forked from aliyun/aliyun-oss-go-sdk
/
auth.go
190 lines (162 loc) · 5.88 KB
/
auth.go
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package oss
import (
"bytes"
"crypto/hmac"
"crypto/sha1"
"crypto/sha256"
"encoding/base64"
"fmt"
"hash"
"io"
"net/http"
"sort"
"strconv"
"strings"
)
// headerSorter defines the key-value structure for storing the sorted data in signHeader.
type headerSorter struct {
Keys []string
Vals []string
}
// getAdditionalHeaderKeys get exist key in http header
func (conn Conn) getAdditionalHeaderKeys(req *http.Request) ([]string, map[string]string) {
var keysList []string
keysMap := make(map[string]string)
srcKeys := make(map[string]string)
for k := range req.Header {
srcKeys[strings.ToLower(k)] = ""
}
for _, v := range conn.config.AdditionalHeaders {
if _, ok := srcKeys[strings.ToLower(v)]; ok {
keysMap[strings.ToLower(v)] = ""
}
}
for k := range keysMap {
keysList = append(keysList, k)
}
sort.Strings(keysList)
return keysList, keysMap
}
// signHeader signs the header and sets it as the authorization header.
func (conn Conn) signHeader(req *http.Request, canonicalizedResource string) {
akIf := conn.config.GetCredentials()
authorizationStr := ""
if conn.config.AuthVersion == AuthV2 {
additionalList, _ := conn.getAdditionalHeaderKeys(req)
if len(additionalList) > 0 {
authorizationFmt := "OSS2 AccessKeyId:%v,AdditionalHeaders:%v,Signature:%v"
additionnalHeadersStr := strings.Join(additionalList, ";")
authorizationStr = fmt.Sprintf(authorizationFmt, akIf.GetAccessKeyID(), additionnalHeadersStr, conn.getSignedStr(req, canonicalizedResource, akIf.GetAccessKeySecret()))
} else {
authorizationFmt := "OSS2 AccessKeyId:%v,Signature:%v"
authorizationStr = fmt.Sprintf(authorizationFmt, akIf.GetAccessKeyID(), conn.getSignedStr(req, canonicalizedResource, akIf.GetAccessKeySecret()))
}
} else {
// Get the final authorization string
authorizationStr = "OSS " + akIf.GetAccessKeyID() + ":" + conn.getSignedStr(req, canonicalizedResource, akIf.GetAccessKeySecret())
}
// Give the parameter "Authorization" value
req.Header.Set(HTTPHeaderAuthorization, authorizationStr)
}
func (conn Conn) getSignedStr(req *http.Request, canonicalizedResource string, keySecret string) string {
// Find out the "x-oss-"'s address in header of the request
ossHeadersMap := make(map[string]string)
additionalList, additionalMap := conn.getAdditionalHeaderKeys(req)
for k, v := range req.Header {
if strings.HasPrefix(strings.ToLower(k), "x-oss-") {
ossHeadersMap[strings.ToLower(k)] = v[0]
} else if conn.config.AuthVersion == AuthV2 {
if _, ok := additionalMap[strings.ToLower(k)]; ok {
ossHeadersMap[strings.ToLower(k)] = v[0]
}
}
}
hs := newHeaderSorter(ossHeadersMap)
// Sort the ossHeadersMap by the ascending order
hs.Sort()
// Get the canonicalizedOSSHeaders
canonicalizedOSSHeaders := ""
for i := range hs.Keys {
canonicalizedOSSHeaders += hs.Keys[i] + ":" + hs.Vals[i] + "\n"
}
// Give other parameters values
// when sign URL, date is expires
date := req.Header.Get(HTTPHeaderDate)
contentType := req.Header.Get(HTTPHeaderContentType)
contentMd5 := req.Header.Get(HTTPHeaderContentMD5)
// default is v1 signature
signStr := req.Method + "\n" + contentMd5 + "\n" + contentType + "\n" + date + "\n" + canonicalizedOSSHeaders + canonicalizedResource
h := hmac.New(func() hash.Hash { return sha1.New() }, []byte(keySecret))
// v2 signature
if conn.config.AuthVersion == AuthV2 {
signStr = req.Method + "\n" + contentMd5 + "\n" + contentType + "\n" + date + "\n" + canonicalizedOSSHeaders + strings.Join(additionalList, ";") + "\n" + canonicalizedResource
h = hmac.New(func() hash.Hash { return sha256.New() }, []byte(keySecret))
}
// convert sign to log for easy to view
if conn.config.LogLevel >= Debug {
var signBuf bytes.Buffer
for i := 0; i < len(signStr); i++ {
if signStr[i] != '\n' {
signBuf.WriteByte(signStr[i])
} else {
signBuf.WriteString("\\n")
}
}
conn.config.WriteLog(Debug, "[Req:%p]signStr:%s\n", req, signBuf.String())
}
io.WriteString(h, signStr)
signedStr := base64.StdEncoding.EncodeToString(h.Sum(nil))
return signedStr
}
func (conn Conn) getRtmpSignedStr(bucketName, channelName, playlistName string, expiration int64, keySecret string, params map[string]interface{}) string {
if params[HTTPParamAccessKeyID] == nil {
return ""
}
canonResource := fmt.Sprintf("/%s/%s", bucketName, channelName)
canonParamsKeys := []string{}
for key := range params {
if key != HTTPParamAccessKeyID && key != HTTPParamSignature && key != HTTPParamExpires && key != HTTPParamSecurityToken {
canonParamsKeys = append(canonParamsKeys, key)
}
}
sort.Strings(canonParamsKeys)
canonParamsStr := ""
for _, key := range canonParamsKeys {
canonParamsStr = fmt.Sprintf("%s%s:%s\n", canonParamsStr, key, params[key].(string))
}
expireStr := strconv.FormatInt(expiration, 10)
signStr := expireStr + "\n" + canonParamsStr + canonResource
h := hmac.New(func() hash.Hash { return sha1.New() }, []byte(keySecret))
io.WriteString(h, signStr)
signedStr := base64.StdEncoding.EncodeToString(h.Sum(nil))
return signedStr
}
// newHeaderSorter is an additional function for function SignHeader.
func newHeaderSorter(m map[string]string) *headerSorter {
hs := &headerSorter{
Keys: make([]string, 0, len(m)),
Vals: make([]string, 0, len(m)),
}
for k, v := range m {
hs.Keys = append(hs.Keys, k)
hs.Vals = append(hs.Vals, v)
}
return hs
}
// Sort is an additional function for function SignHeader.
func (hs *headerSorter) Sort() {
sort.Sort(hs)
}
// Len is an additional function for function SignHeader.
func (hs *headerSorter) Len() int {
return len(hs.Vals)
}
// Less is an additional function for function SignHeader.
func (hs *headerSorter) Less(i, j int) bool {
return bytes.Compare([]byte(hs.Keys[i]), []byte(hs.Keys[j])) < 0
}
// Swap is an additional function for function SignHeader.
func (hs *headerSorter) Swap(i, j int) {
hs.Vals[i], hs.Vals[j] = hs.Vals[j], hs.Vals[i]
hs.Keys[i], hs.Keys[j] = hs.Keys[j], hs.Keys[i]
}