eta_task/services/hz_data_api.go

package services

import (
	"bytes"
	"crypto/md5"
	"encoding/json"
	"errors"
	"eta/eta_task/utils"
	"fmt"
	"github.com/shopspring/decimal"
	"io/ioutil"
	"net/http"
	"reflect"
	"sort"
	"strings"
	"time"
)

const (
	HZ_DATA_API = "https://hzdataapi.hzinsights.com/hzdataapi/"
)

func HttpPost(method string, postDataMap map[string]interface{}) (result string, err error) {
	bytesData, err := handlePostData(postDataMap)
	if err != nil {
		return
	}

	client := &http.Client{}
	req, err := http.NewRequest("POST", HZ_DATA_API+method, bytes.NewReader(bytesData))
	if err != nil {
		return "", err
	}
	req.Header.Set("content-type", "application/json")
	resp, err := client.Do(req)
	if err != nil {
		return "", err
	}
	body, err := ioutil.ReadAll(resp.Body)
	if err != nil {
		return "", err
	}
	result = string(body)
	return
}

// handlePostData 处理post请求数据
func handlePostData(postDataMap map[string]interface{}) (bytesData []byte, err error) {
	postDataMap["nonce_str"] = utils.GetRandString(16) // 随机字符串
	postDataMap["timestamp"] = time.Now().Unix()       //当前格林威治时间，int64类型
	postDataMap["appid"] = utils.APPID                 //当前格林威治时间，int64类型
	// 待签名数据
	signData := convertParamInterface(postDataMap)
	sign, err := getSignData(signData)
	if err != nil {
		return
	}
	postDataMap["sign"] = sign //签名

	bytesData, err = json.Marshal(postDataMap)

	return
}

// 将请求传入的数据格式转换成签名需要的格式（目前只能处理简单的类型，数组、对象暂不支持）
func convertParamInterface(params map[string]interface{}) (signData map[string]string) {
	signData = make(map[string]string)
	for key := range params {
		val := ``
		//fmt.Println("key", key, ";val:", params[key], ";type:", reflect.TypeOf(params[key]))
		//signData[key] = params[key][0]
		tmpVal := params[key]
		switch reflect.TypeOf(tmpVal).Kind() {
		case reflect.String:
			val = fmt.Sprint(tmpVal)
		case reflect.Int, reflect.Int16, reflect.Int64, reflect.Int32, reflect.Int8:
			val = fmt.Sprint(tmpVal)
		case reflect.Uint, reflect.Uint32, reflect.Uint16, reflect.Uint8, reflect.Uint64:
			val = fmt.Sprint(tmpVal)
		case reflect.Bool:
			val = fmt.Sprint(tmpVal)
		case reflect.Float64:
			decimalNum := decimal.NewFromFloat(tmpVal.(float64))
			val = decimalNum.String()
			//val = strconv.FormatFloat(tmpVal.(float64), 'E', -1, 64) //float64
		case reflect.Float32:
			decimalNum := decimal.NewFromFloat32(tmpVal.(float32))
			val = decimalNum.String()
		}
		signData[key] = val
	}
	return signData
}

// getSignData 获取参数签名
func getSignData(postData map[string]string) (sign string, err error) {
	appid := utils.APPID
	if appid == "" {
		err = errors.New("参数异常，缺少appid")
		return
	}

	secret := utils.SECRET
	if secret == "" {
		err = errors.New("参数异常，缺少secret")
		return
	}

	if postData["nonce_str"] == "" {
		err = errors.New("参数异常，缺少随机字符串")
		return
	}
	if postData["timestamp"] == "" {
		err = errors.New("参数异常，缺少时间戳")
		return
	}

	//先取出除sign外的所有的提交的参数key
	var keys []string
	for k := range postData {
		if k != "sign" {
			keys = append(keys, k)
		}
	}

	//1,根据参数名称的ASCII码表的顺序排序
	sort.Strings(keys)

	//2 根据排序后的参数名称，取出对应的值，并拼接字符串
	var signStr string
	for _, v := range keys {
		signStr += v + "=" + postData[v] + "&"
	}
	//3,全转小写(md5(拼装的字符串后+分配给你的app_secret))
	//sign := strings.ToLower(fmt.Sprintf("%x", md5.Sum([]byte(strings.Trim(signStr, "&")+key))))

	//md5.Sum([]byte(signStr+"key="+key))  这是md5加密出来后的每个字符的ascall码，需要再转换成对应的字符
	//3,全转大写(md5(拼装的字符串后+分配给你的app_secret))
	sign = strings.ToUpper(fmt.Sprintf("%x", md5.Sum([]byte(signStr+"secret="+secret))))

	return
}