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util.go
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util.go
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package sign
import (
"bytes"
"context"
"crypto/hmac"
"crypto/md5"
"crypto/sha256"
"encoding/base64"
"fmt"
"io/ioutil"
"net/http"
"sort"
"strconv"
"time"
"github.com/google/uuid"
)
var signHeaders = map[string]struct{}{
http.CanonicalHeaderKey(HTTPHeaderCAKey): {},
http.CanonicalHeaderKey(HTTPHeaderCANonce): {},
http.CanonicalHeaderKey(HTTPHeaderCASignatureMethod): {},
http.CanonicalHeaderKey(HTTPHeaderCATimestamp): {},
}
func getSortKeys(m map[string][]string, needFormat ...bool) []string {
nf := false
if len(needFormat) > 0 {
nf = needFormat[0]
}
keys := make([]string, 0, len(m))
for key := range m {
if nf {
key = http.CanonicalHeaderKey(key)
}
keys = append(keys, key)
}
sort.Strings(keys)
return keys
}
// copyRequest returns the copied request.
func copyRequest(r *http.Request) (*http.Request, error) {
clone := r.Clone(context.Background())
if r.Body == nil {
clone.Body = nil
} else if r.Body == http.NoBody {
clone.Body = http.NoBody
} else if r.GetBody != nil {
body, err := r.GetBody()
if err != nil {
return nil, fmt.Errorf("request get body err: %w", err)
}
clone.Body = body
} else {
var buf bytes.Buffer
if _, err := buf.ReadFrom(r.Body); err != nil {
return nil, fmt.Errorf("read from request body err: %w", err)
}
if err := r.Body.Close(); err != nil {
return nil, fmt.Errorf("request body close err: %w", err)
}
r.Body = ioutil.NopCloser(&buf)
clone.Body = ioutil.NopCloser(bytes.NewBuffer(buf.Bytes()))
}
return clone, nil
}
// CurrentTimeMillis returns the millisecond representation of the current time.
func CurrentTimeMillis() string {
t := time.Now().UnixNano() / 1000000
return strconv.FormatInt(t, 10)
}
// CurrentGMTDate returns the GMT date representation of the current time.
func CurrentGMTDate() string {
return time.Now().UTC().Format(http.TimeFormat)
}
// UUID4 returns random generated UUID string.
func UUID4() string {
u, err := uuid.NewRandom()
if err != nil {
return ""
}
return u.String()
}
// HmacSHA256 returns the string encrypted with HmacSHA256 method.
func HmacSHA256(b, key []byte) string {
h := hmac.New(sha256.New, key)
h.Write(b)
return base64.StdEncoding.EncodeToString(h.Sum(nil))
}
// MD5 returns the string hashed with MD5 method.
func MD5(b []byte) string {
m := md5.New()
m.Write(b)
return base64.StdEncoding.EncodeToString(m.Sum(nil))
}