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sign.go
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sign.go
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package base
import (
"bytes"
"crypto/hmac"
"crypto/md5"
"crypto/sha256"
"encoding/base64"
"encoding/hex"
"fmt"
"io/ioutil"
"net/http"
"net/url"
"sort"
"strings"
"time"
)
func (c Credentials) Sign(request *http.Request) *http.Request {
query := request.URL.Query()
request.URL.RawQuery = query.Encode()
if request.URL.Path == "" {
request.URL.Path += "/"
}
requestParam := RequestParam{
IsSignUrl: false,
Body: readAndReplaceBody(request),
Host: request.Host,
Path: request.URL.Path,
Method: request.Method,
Date: now(),
QueryList: query,
Headers: request.Header,
}
signRequest := GetSignRequest(requestParam, c)
request.Header.Set("Host", signRequest.Host)
request.Header.Set("Content-Type", signRequest.ContentType)
request.Header.Set("X-Date", signRequest.XDate)
request.Header.Set("X-Content-Sha256", signRequest.XContentSha256)
request.Header.Set("Authorization", signRequest.Authorization)
if signRequest.XSecurityToken != "" {
request.Header.Set("X-Security-Token", signRequest.XSecurityToken)
}
return request
}
func (c Credentials) SignUrl(request *http.Request) string {
query := request.URL.Query()
requestParam := RequestParam{
IsSignUrl: true,
Body: readAndReplaceBody(request),
Host: request.Host,
Path: request.URL.Path,
Method: request.Method,
Date: now(),
QueryList: query,
Headers: request.Header,
}
signRequest := GetSignRequest(requestParam, c)
query.Set("X-Date", signRequest.XDate)
query.Set("X-NotSignBody", signRequest.XNotSignBody)
query.Set("X-Credential", signRequest.XCredential)
query.Set("X-Algorithm", signRequest.XAlgorithm)
query.Set("X-SignedHeaders", signRequest.XSignedHeaders)
query.Set("X-SignedQueries", signRequest.XSignedQueries)
query.Set("X-Signature", signRequest.XSignature)
if signRequest.XSecurityToken != "" {
query.Set("X-Security-Token", signRequest.XSecurityToken)
}
return query.Encode()
}
func GetSignRequest(requestParam RequestParam, credentials Credentials) SignRequest {
formatDate := appointTimestampV4(requestParam.Date)
meta := getMetaData(credentials, tsDateV4(formatDate))
requestSignMap := make(map[string][]string)
if credentials.SessionToken != "" {
requestSignMap["X-Security-Token"] = []string{credentials.SessionToken}
}
signRequest := SignRequest{
XDate: formatDate,
XSecurityToken: credentials.SessionToken,
}
var bodyHash string
if requestParam.IsSignUrl {
for k, v := range requestParam.QueryList {
requestSignMap[k] = v
}
requestSignMap["X-Date"], requestSignMap["X-NotSignBody"], requestSignMap["X-Credential"], requestSignMap["X-Algorithm"], requestSignMap["X-SignedHeaders"], requestSignMap["X-SignedQueries"] =
[]string{formatDate}, []string{""}, []string{credentials.AccessKeyID + "/" + meta.credentialScope}, []string{meta.algorithm}, []string{meta.signedHeaders}, []string{""}
keys := make([]string, 0, len(requestSignMap))
for k := range requestSignMap {
keys = append(keys, k)
}
sort.Strings(keys)
requestSignMap["X-SignedQueries"] = []string{strings.Join(keys, ";")}
signRequest.XNotSignBody, signRequest.XCredential, signRequest.XAlgorithm, signRequest.XSignedHeaders, signRequest.XSignedQueries =
"", credentials.AccessKeyID+"/"+meta.credentialScope, meta.algorithm, meta.signedHeaders, strings.Join(keys, ";")
bodyHash = hashSHA256([]byte{})
} else {
for k, v := range requestParam.Headers {
requestSignMap[k] = v
}
if requestSignMap["Content-Type"] == nil {
signRequest.ContentType = "application/x-www-form-urlencoded; charset=utf-8"
} else {
signRequest.ContentType = requestSignMap["Content-Type"][0]
}
requestSignMap["X-Date"], requestSignMap["Host"], requestSignMap["Content-Type"] = []string{formatDate}, []string{requestParam.Host}, []string{signRequest.ContentType}
if len(requestParam.Body) == 0 {
bodyHash = hashSHA256([]byte{})
} else {
bodyHash = hashSHA256(requestParam.Body)
}
requestSignMap["X-Content-Sha256"] = []string{bodyHash}
signRequest.Host, signRequest.XContentSha256 = requestParam.Host, bodyHash
}
signature := getSignatureStr(requestParam, meta, credentials.SecretAccessKey, formatDate, requestSignMap, bodyHash)
if requestParam.IsSignUrl {
signRequest.XSignature = signature
} else {
signRequest.Authorization = buildAuthHeaderV4(signature, meta, credentials)
}
return signRequest
}
func getSignatureStr(requestParam RequestParam, meta *metadata, secretAccessKey string,
formatDate string, requestSignMap map[string][]string, bodyHash string) string {
// Task 1
hashedCanonReq := hashedCanonicalRequestV4(requestParam, meta, requestSignMap, bodyHash)
// Task 2
stringToSign := concat("\n", meta.algorithm, formatDate, meta.credentialScope, hashedCanonReq)
// Task 3
signingKey := signingKeyV4(secretAccessKey, meta.date, meta.region, meta.service)
return signatureV4(signingKey, stringToSign)
}
func hashedCanonicalRequestV4(param RequestParam, meta *metadata, requestSignMap map[string][]string, bodyHash string) string {
var canonicalRequest string
if param.IsSignUrl {
queryList := make(url.Values)
for k, v := range requestSignMap {
for i := range v {
queryList.Set(k, v[i])
}
}
canonicalRequest = concat("\n", param.Method, normuri(param.Path), normquery(queryList), "\n", meta.signedHeaders, bodyHash)
} else {
canonicalHeaders := getCanonicalHeaders(param, meta, requestSignMap)
canonicalRequest = concat("\n", param.Method, normuri(param.Path), normquery(param.QueryList), canonicalHeaders, meta.signedHeaders, bodyHash)
}
return hashSHA256([]byte(canonicalRequest))
}
func getCanonicalHeaders(param RequestParam, meta *metadata, requestSignMap map[string][]string) string {
signMap := make(map[string][]string)
signedHeaders := sortHeaders(requestSignMap, signMap)
if !param.IsSignUrl {
meta.signedHeaders = concat(";", signedHeaders...)
}
if param.Path == "" {
param.Path = "/"
}
var headersToSign string
for _, key := range signedHeaders {
value := strings.TrimSpace(signMap[key][0])
if key == "host" {
if strings.Contains(value, ":") {
split := strings.Split(value, ":")
port := split[1]
if port == "80" || port == "443" {
value = split[0]
}
}
}
headersToSign += key + ":" + value + "\n"
}
return headersToSign
}
func sortHeaders(requestSignMap map[string][]string, signMap map[string][]string) []string {
var sortedHeaderKeys []string
for k, v := range requestSignMap {
signMap[strings.ToLower(k)] = v
switch k {
case "Content-Type", "Content-Md5", "Host", "X-Security-Token":
default:
if !strings.HasPrefix(k, "X-") {
continue
}
}
sortedHeaderKeys = append(sortedHeaderKeys, strings.ToLower(k))
}
sort.Strings(sortedHeaderKeys)
return sortedHeaderKeys
}
func getMetaData(credentials Credentials, date string) *metadata {
meta := new(metadata)
meta.date, meta.service, meta.region, meta.signedHeaders, meta.algorithm = date, credentials.Service, credentials.Region, "", "HMAC-SHA256"
meta.credentialScope = concat("/", meta.date, meta.region, meta.service, "request")
return meta
}
func signatureV4(signingKey []byte, stringToSign string) string {
return hex.EncodeToString(hmacSHA256(signingKey, stringToSign))
}
func signingKeyV4(secretKey, date, region, service string) []byte {
kDate := hmacSHA256([]byte(secretKey), date)
kRegion := hmacSHA256(kDate, region)
kService := hmacSHA256(kRegion, service)
kSigning := hmacSHA256(kService, "request")
return kSigning
}
func buildAuthHeaderV4(signature string, meta *metadata, keys Credentials) string {
credential := keys.AccessKeyID + "/" + meta.credentialScope
return meta.algorithm +
" Credential=" + credential +
", SignedHeaders=" + meta.signedHeaders +
", Signature=" + signature
}
func timestampV4() string {
return now().Format(timeFormatV4)
}
func appointTimestampV4(date time.Time) string {
return date.Format(timeFormatV4)
}
func tsDateV4(timestamp string) string {
return timestamp[:8]
}
func hmacSHA256(key []byte, content string) []byte {
mac := hmac.New(sha256.New, key)
mac.Write([]byte(content))
return mac.Sum(nil)
}
func hashSHA256(content []byte) string {
h := sha256.New()
h.Write(content)
return fmt.Sprintf("%x", h.Sum(nil))
}
func hashMD5(content []byte) string {
h := md5.New()
h.Write(content)
return base64.StdEncoding.EncodeToString(h.Sum(nil))
}
func readAndReplaceBody(request *http.Request) []byte {
if request.Body == nil {
return []byte{}
}
payload, _ := ioutil.ReadAll(request.Body)
request.Body = ioutil.NopCloser(bytes.NewReader(payload))
return payload
}
func concat(delim string, str ...string) string {
return strings.Join(str, delim)
}
var now = func() time.Time {
return time.Now().UTC()
}
func normuri(uri string) string {
parts := strings.Split(uri, "/")
for i := range parts {
parts[i] = encodePathFrag(parts[i])
}
return strings.Join(parts, "/")
}
func encodePathFrag(s string) string {
hexCount := 0
for i := 0; i < len(s); i++ {
c := s[i]
if shouldEscape(c) {
hexCount++
}
}
t := make([]byte, len(s)+2*hexCount)
j := 0
for i := 0; i < len(s); i++ {
c := s[i]
if shouldEscape(c) {
t[j] = '%'
t[j+1] = "0123456789ABCDEF"[c>>4]
t[j+2] = "0123456789ABCDEF"[c&15]
j += 3
} else {
t[j] = c
j++
}
}
return string(t)
}
func shouldEscape(c byte) bool {
if 'a' <= c && c <= 'z' || 'A' <= c && c <= 'Z' {
return false
}
if '0' <= c && c <= '9' {
return false
}
if c == '-' || c == '_' || c == '.' || c == '~' {
return false
}
return true
}
func normquery(v url.Values) string {
queryString := v.Encode()
return strings.Replace(queryString, "+", "%20", -1)
}