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golang验证代码

package main

import (
    "crypto/sha1"
    "fmt"
    "io"
    "log"
    "net/http"
    "sort"
    "strings"
)

const (
    token = "sixah" //设置token
)

func makeSignature(timestamp, nonce string) string { //本地计算signature
    si := []string{token, timestamp, nonce}
    sort.Strings(si)            //字典序排序
    str := strings.Join(si, "") //组合字符串
    s := sha1.New()             //返回一个新的使用SHA1校验的hash.Hash接口
    io.WriteString(s, str)      //WriteString函数将字符串数组str中的内容写入到s中
    return fmt.Sprintf("%x", s.Sum(nil))
}

func validateUrl(w http.ResponseWriter, r *http.Request) bool {
    timestamp := strings.Join(r.Form["timestamp"], "")
    nonce := strings.Join(r.Form["nonce"], "")
    signature := strings.Join(r.Form["signature"], "")
    echostr := strings.Join(r.Form["echostr"], "")
    signatureGen := makeSignature(timestamp, nonce)

    if signatureGen != signature {
        return false
    }
    fmt.Fprintf(w, echostr) //原样返回eechostr给微信服务器
    return true
}

func procSignature(w http.ResponseWriter, r *http.Request) {
    r.ParseForm() //Request需要解析
    if !validateUrl(w, r) {
        log.Println("Wechat Service: This http request is not from wechat platform")
        return
    }
    log.Println("validateUrl Ok")
}

func main() {
    log.Println("Wechat Service: Start!")
    http.HandleFunc("/", procSignature)
    err := http.ListenAndServe(":80", nil)
    if err != nil {
        log.Println("Wechat Service: ListenAndServe Error: ", err)
    }
    log.Println("Wechat Service: Stop!")
}