golang按key值进行升序排序（ksort），对字符串进行sha1哈希

在对接PHP语言实现的签名的时候，看见对方用了ksort，由于golang里面对map的遍历是无序的，所以用golang实现了对map按key值进行升序排序：

package main

import (
    "crypto/sha1"
    "encoding/hex"
    "fmt"
    "sort"
    "strconv"
    "time"
)

func main() {
    timeStamp := time.Now().Unix()
    params := map[string]string{
        "staff_name": "hhh",
        "client_id":  "123",
        "staff_id":   "114",
        "time":       strconv.FormatInt(timeStamp, 10),
        "secret":     "aaa-999",
        "sign":       "",
    }

    var dataParams string
    //ksort
    var keys []string
    for k := range params {
        keys = append(keys, k)
    }
    sort.Strings(keys)

    //拼接
    for _, k := range keys {
        fmt.Println("key:", k, "Value:", params[k])
        dataParams = dataParams + k + "=" + params[k] + "&"
    }
    fmt.Println(dataParams)
    ff := dataParams[0 : len(dataParams)-1]
    fmt.Println("去掉最后一个&：", ff)

    //对字符串进行sha1哈希
    h := sha1.New()
    h.Write([]byte(dataParams))
    bs := h.Sum(nil)
    sign := hex.EncodeToString(bs)

    //拼接请求参数
    dataPost := dataParams + "&sign" + "=" + sign
    fmt.Println(dataPost)
}

排序结果如下：

key: client_id Value: 123
key: secret Value: aaa-999
key: sign Value: 
key: staff_id Value: 114
key: staff_name Value: hhh
key: time Value: 1554100502

sh1哈希结果：

3c8cfd20311b2ac0c74df290686e34a61a55ad71