package util
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import (
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"crypto/hmac"
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"crypto/md5"
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"crypto/sha256"
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"encoding/base64"
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"encoding/hex"
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"fmt"
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"math/rand"
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"strconv"
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"strings"
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"time"
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"unsafe"
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)
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func Sha256(message string) string {
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h := sha256.New()
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h.Write([]byte(message))
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res := h.Sum(nil)
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return hex.EncodeToString(res)
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}
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func ComputeHmacSha256Base64(message string, secret string) string {
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key := []byte(secret)
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h := hmac.New(sha256.New, key)
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h.Write([]byte(message))
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abs := h.Sum(nil)
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return base64.StdEncoding.EncodeToString(abs)
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}
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func Hik_ComputeSignatureBase64(appKey string, appSecret string, httpMethod string, accept string, contentType string, date string, url string) string {
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httpHeaders := httpMethod +"\n" + accept + "\n" + contentType + "\n"+ date +"\n"
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customHeaders := "x-ca-key:"+ appKey +"\n"
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msg := httpHeaders + customHeaders + url
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return ComputeHmacSha256Base64(msg, appSecret)
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}
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type SliceMock struct {
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addr uintptr
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len int
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cap int
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}
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func GetIBytes(v interface{}) []byte {
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len := unsafe.Sizeof(v)
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dataBytes := &SliceMock{
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addr: uintptr(unsafe.Pointer(&v)),
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cap: int(len),
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len: int(len),
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}
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b := *(*[]byte)(unsafe.Pointer(dataBytes))
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return b
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}
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func MD5Base64(s []byte) string {
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sum := md5.Sum(s)
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return base64.StdEncoding.EncodeToString(sum[:])
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}
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func GenValidateCode(width int) string {
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numeric := [10]byte{0,1,2,3,4,5,6,7,8,9}
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r := len(numeric)
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rand.Seed(time.Now().UnixNano())
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var sb strings.Builder
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for i := 0; i < width; i++ {
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fmt.Fprintf(&sb, "%d", numeric[ rand.Intn(r) ])
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}
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str := sb.String()
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if strings.HasPrefix(str, "0") {
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pI := RandInt(1,9)
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str = strconv.Itoa(pI) + str[1:]
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}
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return str
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}
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//生成区间随机数
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func RandInt(min, max int) int {
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if min >= max || min ==0 ||max == 0 {
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return max
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}
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return rand.Intn(max-min) + min
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}
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