util/wechat/client.go

package wechat

import (
	"encoding/json"
	"net/url"
	"time"
)

// Client wechat
type Client struct {
	AppID          string `json:"appid"`
	AppSecret      string `json:"appsecret"`
	Token          string `json:"token"`
	EncodingAESKey string `json:"encodingaeskey"`

	AccessToken   string
	LastTokenTime int64
}

// FormAuthorize get code
type FormAuthorize struct {
	Code  string `form:"code"`
	State string `form:"state"`
	URL   string `form:"url"`
}

// FormOpenID openid
type FormOpenID struct {
	OpenID string `form:"openid"`
}

// FormMaterial Material
type FormMaterial struct {
	Type   string `form:"type"`
	Offset int    `form:"offset"`
	Count  int    `form:"count"`
}

// UserInfo userinfo
type UserInfo struct {
	SubScribe      int    `json:"subscribe"`
	OpenID         string `json:"openid"`
	NickName       string `json:"nickname"`
	Sex            int    `json:"sex"`
	Language       string `json:"language"`
	City           string `json:"city"`
	Province       string `json:"province"`
	Country        string `json:"country"`
	HeadImgURL     string `json:"headimgurl"`
	SubscribeTime  int    `json:"subscribe_time"`
	Remark         string `json:"remark"`
	GroupID        int    `json:"groupid"`
	TagidList      []int  `json:"tagid_list"`
	SubscribeScene string `json:"subscribe_scene"`
	QrScene        int    `json:"qr_scene"`
	QrSceneStr     string `json:"qr_scene_str"`
}

// List openid list
type List struct {
	OpenID []string `json:"openid"`
}

// UserList user list
type UserList struct {
	Total      int    `json:"total"`
	Count      int    `json:"count"`
	Data       List   `json:"data"`
	NextOpenID string `json:"next_openid"`
}

type newsitem struct {
	Title              string `json:"title"`
	Author             string `json:"author"`
	Digest             string `json:"digest"`
	Content            string `json:"content"`
	ContentSourceURL   string `json:"content_source_url"`
	ThumbMediaID       string `json:"thumb_media_id"`
	ShowCoverPic       int    `json:"show_cover_pic"`
	URL                string `json:"url"`
	ThumbURL           string `json:"thumb_url"`
	NeedOpenComment    int    `json:"need_open_comment"`
	OnlyFansCanComment int    `json:"only_fans_can_comment"`
}

type content struct {
	NewsItem   []*newsitem `json:"news_item,omitempty"`
	CreateTime int         `json:"create_time,omitempty"`
	UpdateTime int         `json:"update_time,omitempty"`
}

type item struct {
	MediaID    string   `json:"media_id"`
	Name       string   `json:"name,omitempty"`
	UpdateTime int      `json:"update_time"`
	URL        string   `json:"url,omitempty"`
	Content    *content `json:"content,omitempty"`
}

// Material 素材
type Material struct {
	TotalCount int    `json:"total_count"`
	ItemCount  int    `json:"item_count"`
	Item       []item `json:"item"`
}

// MiniProgramPage mini
type MiniProgramPage struct {
	AppID    string `json:"appid,omitempty"`
	PagePath string `json:"pagepath,omitempty"`
}

// ValueColor value color
type ValueColor struct {
	Value string `json:"value"`
	Color string `json:"color,omitempty"`
}

// TemplateData data
type TemplateData struct {
	First    *ValueColor `json:"first"`
	Keyword1 *ValueColor `json:"keyword1,omitempty"`
	Keyword2 *ValueColor `json:"keyword2,omitempty"`
	Keyword3 *ValueColor `json:"keyword3,omitempty"`
	Keyword4 *ValueColor `json:"keyword4,omitempty"`
	Keyword5 *ValueColor `json:"keyword5,omitempty"`
	Remark   *ValueColor `json:"remark,omitempty"`
}

// TemplateMessage template message
type TemplateMessage struct {
	ToUser      string           `json:"touser"`
	TemplateID  string           `json:"template_id"`
	URL         string           `json:"url"`
	MiniProgram *MiniProgramPage `json:"miniprogram,omitempty"`
	Data        TemplateData     `json:"data"`
}

func key(appid string) string {
	return "wechat:client:" + appid
}

// NewClient new client
func NewClient(appID, appSecret, token, encodingAESKey string) *Client {
	key := key(appID)
	if v, ok := cache.Load(key); ok {
		return v.(*Client)
	}
	c := &Client{AppID: appID, AppSecret: appSecret, Token: token, EncodingAESKey: encodingAESKey}
	cache.Store(key, c)
	return c
}

// getToken get token
func (wc *Client) getToken() (token string, err error) {
	now := time.Now().Unix()
	if wc.LastTokenTime > 0 {
		if now-wc.LastTokenTime < TokenExpires {
			token = wc.AccessToken
			return
		}
	}
	uri := BaseURL + "/cgi-bin/token?"

	args := url.Values{}
	args.Add("grant_type", "client_credential")
	args.Add("appid", wc.AppID)
	args.Add("secret", wc.AppSecret)

	uri += args.Encode()
	var res Response
	if res, err = getJSON(uri); err == nil {
		wc.LastTokenTime = now
		wc.AccessToken = res.AccessToken
		token = wc.AccessToken
		key := key(wc.AppID)
		cache.Store(key, wc)
	}
	return
}

// GetCodeURL get code 授权获取 OpenID URL
// /connect/oauth2/authorize?appid=APPID&redirect_uri=REDIRECT_URI&response_type=code&scope=SCOPE&state=STATE#wechat_redirect
// 转向到
// redirect_uri/?code=CODE&state=STATE
func (wc Client) GetCodeURL(redirectURL, state string) (uri string) {
	uri = OpenURL + "/connect/oauth2/authorize?"
	args := url.Values{}
	args.Add("appid", wc.AppID)
	args.Add("redirect_uri", redirectURL)
	args.Add("response_type", "code")
	args.Add("scope", "snsapi_base")
	args.Add("state", state)

	uri += args.Encode()
	uri += "#wechat_redirect"

	return
}

// GetOpenID 获取 OpenID
// /sns/oauth2/access_token?appid=APPID&secret=SECRET&code=CODE&grant_type=authorization_code
func (wc Client) GetOpenID(code string) (res Response, err error) {
	uri := BaseURL + "/sns/oauth2/access_token?"

	if wc.AccessToken, err = wc.getToken(); err != nil {
		return
	}
	args := url.Values{}
	args.Add("access_token", wc.AccessToken)
	args.Add("appid", wc.AppID)
	args.Add("secret", wc.AppSecret)
	args.Add("code", code)
	args.Add("grant_type", "authorization_code")

	uri += args.Encode()
	res, err = getJSON(uri)

	return
}

// GetUserInfo user info
func (wc Client) GetUserInfo(openid string) (res UserInfo, err error) {
	uri := BaseURL + "/cgi-bin/user/info?"

	if wc.AccessToken, err = wc.getToken(); err != nil {
		return
	}
	args := url.Values{}
	args.Add("access_token", wc.AccessToken)
	args.Add("openid", openid)
	args.Add("lang", "zh_CN")

	uri += args.Encode()
	var body []byte
	body, err = getBody(uri)
	if err == nil {
		err = json.Unmarshal(body, &res)
	}

	return
}

// GetUserList user list
func (wc Client) GetUserList(nextOpenID string) (res UserList, err error) {
	uri := BaseURL + "/cgi-bin/user/get?"

	if wc.AccessToken, err = wc.getToken(); err != nil {
		return
	}
	args := url.Values{}
	args.Add("access_token", wc.AccessToken)
	args.Add("next_openid", nextOpenID)

	uri += args.Encode()
	var body []byte
	body, err = getBody(uri)
	if err == nil {
		err = json.Unmarshal(body, &res)
	}

	return
}

// GetMaterial 永久资料
func (wc Client) GetMaterial(mtype string, offset, count int) (res Material, err error) {
	uri := BaseURL + "/cgi-bin/material/batchget_material?"

	if wc.AccessToken, err = wc.getToken(); err != nil {
		return
	}

	args := url.Values{}
	data := make(map[string]interface{})

	args.Add("access_token", wc.AccessToken)

	data["type"] = mtype
	data["offset"] = offset
	data["count"] = count

	uri += args.Encode()
	var body []byte

	params, err := json.Marshal(data)
	body, err = postBody(uri, params)
	if err == nil {
		err = json.Unmarshal(body, &res)
	}

	return
}

// SendTemplateMessage send template message
// POST /cgi-bin/message/template/send?access_token=ACCESS_TOKEN
func (wc Client) SendTemplateMessage(template TemplateMessage) (res Response, err error) {
	uri := BaseURL + "/cgi-bin/message/template/send?"

	if wc.AccessToken, err = wc.getToken(); err != nil {
		return
	}
	args := url.Values{}
	args.Add("access_token", wc.AccessToken)

	uri += args.Encode()
	data, err := json.Marshal(template)
	if err != nil {
		return
	}
	res, err = postJSON(uri, data)
	return
}