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sign.go
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sign.go
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package common
import (
"bytes"
"crypto/hmac"
"crypto/sha1"
"crypto/sha256"
"encoding/base64"
"encoding/hex"
"hash"
"sort"
tchttp "github.com/tencentcloud/tencentcloud-sdk-go-intl-en/tencentcloud/common/http"
)
const (
SHA256 = "HmacSHA256"
SHA1 = "HmacSHA1"
)
func Sign(s, secretKey, method string) string {
var hashed hash.Hash
switch method {
case SHA256:
hashed = hmac.New(sha256.New, []byte(secretKey))
default:
hashed = hmac.New(sha1.New, []byte(secretKey))
}
hashed.Write([]byte(s))
return base64.StdEncoding.EncodeToString(hashed.Sum(nil))
}
func sha256hex(s string) string {
b := sha256.Sum256([]byte(s))
return hex.EncodeToString(b[:])
}
func hmacsha256(s, key string) string {
hashed := hmac.New(sha256.New, []byte(key))
hashed.Write([]byte(s))
return string(hashed.Sum(nil))
}
func signRequest(request tchttp.Request, credential CredentialIface, method string) (err error) {
if method != SHA256 {
method = SHA1
}
params := request.GetParams()
secId, secKey, token := credential.GetCredential()
params["SecretId"] = secId
if len(token) != 0 {
params["Token"] = token
}
params["SignatureMethod"] = method
delete(params, "Signature")
s := getStringToSign(request)
signature := Sign(s, secKey, method)
request.GetParams()["Signature"] = signature
return
}
func getStringToSign(request tchttp.Request) string {
method := request.GetHttpMethod()
domain := request.GetDomain()
path := request.GetPath()
var buf bytes.Buffer
buf.WriteString(method)
buf.WriteString(domain)
buf.WriteString(path)
buf.WriteString("?")
params := request.GetParams()
// sort params
keys := make([]string, 0, len(params))
for k := range params {
keys = append(keys, k)
}
sort.Strings(keys)
for i := range keys {
k := keys[i]
buf.WriteString(k)
buf.WriteString("=")
buf.WriteString(params[k])
buf.WriteString("&")
}
buf.Truncate(buf.Len() - 1)
return buf.String()
}