package util

import (
	"crypto/hmac"
	"crypto/md5"
	"crypto/sha256"
	"encoding/base64"
	"unsafe"
)
func ComputeHmacSha256Base64(message string, secret string) string {
	key := []byte(secret)
	h := hmac.New(sha256.New, key)
	h.Write([]byte(message))
	abs := h.Sum(nil)

	return base64.StdEncoding.EncodeToString(abs)
}

func Hik_ComputeSignatureBase64(appKey string, appSecret string, httpMethod string, accept string, contentType string, date string, url string) string {
	httpHeaders := httpMethod +"\n" + accept + "\n" + contentType + "\n"+ date +"\n"
	customHeaders := "x-ca-key:"+ appKey +"\n"
	msg := httpHeaders + customHeaders + url
	return ComputeHmacSha256Base64(msg, appSecret)
}

type SliceMock struct {
	addr uintptr
	len int
	cap int
}

func GetIBytes(v interface{}) []byte {
	len := unsafe.Sizeof(v)
	dataBytes := &SliceMock{
		addr: uintptr(unsafe.Pointer(&v)),
		cap: int(len),
		len: int(len),
	}
	b := *(*[]byte)(unsafe.Pointer(dataBytes))
	return b
}

func MD5Base64(s []byte) string {
	sum := md5.Sum(s)
	return base64.StdEncoding.EncodeToString(sum[:])
}