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client.go
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client.go
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// Copyright 2020 FastWeGo
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package wxpay
import (
"bytes"
"crypto/tls"
"encoding/pem"
"encoding/xml"
"errors"
"fmt"
"io/ioutil"
"net/http"
"github.com/fastwego/wxpay/util"
"golang.org/x/crypto/pkcs12"
)
/*
微信 api 服务器地址
*/
var WXPayServerUrl = "https://api.mch.weixin.qq.com"
// 获取RSA公钥API
var RSAServerUrl = "https://fraud.mch.weixin.qq.com"
/*
HttpClient 用于向接口发送请求
*/
type Client struct {
Ctx *WXPay
}
//HTTPPost POST 请求
func (client *Client) HTTPPost(uri string, params map[string]string, isCertificate bool) (resp []byte, err error) {
// 签名
sign, err := client.Ctx.Sign(params, params["sign_type"])
if err != nil {
return
}
params["sign"] = sign
body, err := util.Map2XML(params)
if err != nil {
return
}
// 特殊处理 rsa 接口服务器地址
ServerUrl := WXPayServerUrl
if uri == "/risk/getpublickey" {
ServerUrl = RSAServerUrl
}
// 是否沙箱
url := ServerUrl + uri
if client.Ctx.Config.IsSandboxMode {
url = ServerUrl + "/sandboxnew" + uri
}
if client.Ctx.Logger != nil {
client.Ctx.Logger.Printf("POST %s %s\n", url, string(body))
}
// 是否需要证书
var httpClient *http.Client
if isCertificate && client.Ctx.Config.Cert != "" {
httpClient, err = client.getHttpsClient()
if err != nil {
return
}
} else {
httpClient = http.DefaultClient
}
response, err := httpClient.Post(url, "application/xml;charset=utf-8", bytes.NewReader(body))
if err != nil {
return
}
defer response.Body.Close()
return client.responseFilter(response)
}
// 双向证书
func (client *Client) getHttpsClient() (c *http.Client, err error) {
certfile, err := ioutil.ReadFile(client.Ctx.Config.Cert)
if err != nil {
return
}
blocks, err := pkcs12.ToPEM(certfile, client.Ctx.Config.Mchid)
if err != nil {
return
}
var pemfile []byte
for _, b := range blocks {
pemfile = append(pemfile, pem.EncodeToMemory(b)...)
}
cert, err := tls.X509KeyPair(pemfile, pemfile)
if err != nil {
return
}
config := &tls.Config{
Certificates: []tls.Certificate{cert},
}
tr := &http.Transport{
TLSClientConfig: config,
DisableCompression: true,
}
return &http.Client{
Transport: tr,
}, nil
}
/*
筛查微信 api 服务器响应,判断以下错误:
- http 状态码 不为 200
- 接口响应错误码 ReturnCode/ResultCode == "FAIL"
*/
func (client *Client) responseFilter(response *http.Response) (resp []byte, err error) {
if response.StatusCode != http.StatusOK {
err = fmt.Errorf("Status %s", response.Status)
return
}
resp, err = ioutil.ReadAll(response.Body)
if err != nil {
return
}
if client.Ctx.Logger != nil {
client.Ctx.Logger.Printf("response %s", string(resp))
}
// 对于 下载类 接口 不返回 xml 内容
if bytes.HasPrefix(resp, []byte("<xml>")) {
errorResponse := struct {
ReturnCode string `xml:"return_code"`
ResultCode string `xml:"result_code"`
}{}
err = xml.Unmarshal(resp, &errorResponse)
if err != nil {
return
}
if errorResponse.ReturnCode == "FAIL" || errorResponse.ResultCode == "FAIL" {
err = errors.New(string(resp))
return
}
}
return
}