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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 wxopen
import (
"encoding/json"
"errors"
"fmt"
"io"
"io/ioutil"
"net/http"
"strings"
)
var (
WXServerUrl = "https://api.weixin.qq.com" // 微信 api 服务器地址
UserAgent = "fastwego/wxopen"
ErrorComponentAccessTokenExpire = errors.New("component_access_token expire")
ErrorSystemBusy = errors.New("system busy")
)
/*
Client 用于向微信接口发送请求
*/
type Client struct {
Ctx *Platform
}
// HTTPGet GET 请求
func (client *Client) HTTPGet(uri string) (resp []byte, err error) {
newUrl, err := client.applyComponentAccessToken(uri)
if err != nil {
return
}
req, err := http.NewRequest(http.MethodGet, WXServerUrl+newUrl, nil)
if err != nil {
return
}
return client.httpDo(req)
}
//HTTPPost POST 请求
func (client *Client) HTTPPost(uri string, payload io.Reader, contentType string) (resp []byte, err error) {
newUrl, err := client.applyComponentAccessToken(uri)
if err != nil {
return
}
req, err := http.NewRequest(http.MethodPost, WXServerUrl+newUrl, payload)
if err != nil {
return
}
req.Header.Add("Content-Type", contentType)
return client.httpDo(req)
}
//httpDo 执行 请求
func (client *Client) httpDo(req *http.Request) (resp []byte, err error) {
req.Header.Add("User-Agent", UserAgent)
if client.Ctx.Logger != nil {
client.Ctx.Logger.Printf("%s %s Headers %v", req.Method, req.URL.String(), req.Header)
}
response, err := http.DefaultClient.Do(req)
if err != nil {
return
}
defer response.Body.Close()
resp, err = responseFilter(response)
// 发现 component_access_token 过期
if err == ErrorComponentAccessTokenExpire {
// 主动 通知 component_access_token 过期
err = client.Ctx.NoticeComponentAccessTokenExpireHandler(client.Ctx)
if err != nil {
return
}
// 通知到位后 component_access_token 会被刷新,那么可以 retry 了
var accessToken string
accessToken, err = client.Ctx.GetComponentAccessTokenHandler(client.Ctx)
if err != nil {
return
}
// 换新
q := req.URL.Query()
q.Set("component_access_token", accessToken)
req.URL.RawQuery = q.Encode()
if client.Ctx.Logger != nil {
client.Ctx.Logger.Printf("%v retry %s %s Headers %v", ErrorComponentAccessTokenExpire, req.Method, req.URL.String(), req.Header)
}
response, err = http.DefaultClient.Do(req)
if err != nil {
return
}
defer response.Body.Close()
resp, err = responseFilter(response)
}
// -1 系统繁忙,此时请开发者稍候再试
// 重试一次
if err == ErrorSystemBusy {
if client.Ctx.Logger != nil {
client.Ctx.Logger.Printf("%v : retry %s %s Headers %v", ErrorSystemBusy, req.Method, req.URL.String(), req.Header)
}
response, err = http.DefaultClient.Do(req)
if err != nil {
return
}
defer response.Body.Close()
resp, err = responseFilter(response)
}
return
}
/*
在请求地址上附加上 component_access_token
*/
func (client *Client) applyComponentAccessToken(oldUrl string) (newUrl string, err error) {
accessToken, err := client.Ctx.GetComponentAccessTokenHandler(client.Ctx)
if err != nil {
return
}
if strings.Contains(oldUrl, "?") {
newUrl = oldUrl + "&component_access_token=" + accessToken
} else {
newUrl = oldUrl + "?component_access_token=" + accessToken
}
return
}
/*
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 errcode 不为 0
*/
func 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
}
errorResponse := struct {
Errcode int64 `json:"errcode"`
Errmsg string `json:"errmsg"`
}{}
err = json.Unmarshal(resp, &errorResponse)
if err != nil {
return
}
// 40001(覆盖刷新超过5min后,使用旧 access_token 报错) 获取 access_token 时 AppSecret 错误,或者 access_token 无效。请开发者认真比对 AppSecret 的正确性,或查看是否正在为恰当的公众号调用接口
// 42001(超过 7200s 后 报错) - access_token 超时,请检查 access_token 的有效期,请参考基础支持 - 获取 access_token 中,对 access_token 的详细机制说明
if errorResponse.Errcode == 42001 || errorResponse.Errcode == 40001 {
err = ErrorComponentAccessTokenExpire
return
}
// -1 系统繁忙,此时请开发者稍候再试
if errorResponse.Errcode == -1 {
err = ErrorSystemBusy
return
}
if errorResponse.Errcode != 0 {
err = errors.New(string(resp))
return
}
return
}