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app/interface/main/web-goblin/dao/wechat/qrcode.go

@@ -0,0 +1,137 @@
+package wechat
+
+import (
+	"context"
+	"encoding/json"
+	"net/http"
+	"net/url"
+	"strings"
+
+	"go-common/app/interface/main/web-goblin/model/wechat"
+	"go-common/library/cache/redis"
+	"go-common/library/ecode"
+	"go-common/library/log"
+)
+
+const (
+	_accessTokenKey = "a_t_k"
+	_accessTokenURI = "/cgi-bin/token"
+	_qrcodeURI      = "/wxa/getwxacodeunlimit"
+)
+
+// RawAccessToken get wechat access token.
+func (d *Dao) RawAccessToken(c context.Context) (data *wechat.AccessToken, err error) {
+	params := url.Values{}
+	params.Set("grant_type", "client_credential")
+	params.Set("appid", d.c.Wechat.AppID)
+	params.Set("secret", d.c.Wechat.Secret)
+	var req *http.Request
+	if req, err = http.NewRequest(http.MethodGet, d.wxAccessTokenURL+"?"+params.Encode(), nil); err != nil {
+		log.Error("AccessToken http.NewRequest error(%v)", err)
+		return
+	}
+	var res struct {
+		Errcode     int    `json:"errcode"`
+		Errmsg      string `json:"errmsg"`
+		AccessToken string `json:"access_token"`
+		ExpiresIN   int64  `json:"expires_in"`
+	}
+	if err = d.httpClient.Do(c, req, &res); err != nil {
+		log.Error("AccessToken d.httpClient.Do error(%v)", err)
+		return
+	}
+	if res.Errcode != ecode.OK.Code() {
+		log.Error("AccessToken errcode error(%d) msg(%s)", res.Errcode, res.Errmsg)
+		err = ecode.RequestErr
+		return
+	}
+	data = &wechat.AccessToken{AccessToken: res.AccessToken, ExpiresIn: res.ExpiresIN}
+	return
+}
+
+// Qrcode get qrcode.
+func (d *Dao) Qrcode(c context.Context, accessToken, arg string) (qrcode []byte, err error) {
+	var (
+		req     *http.Request
+		bs      []byte
+		jsonErr error
+	)
+	params := url.Values{}
+	params.Set("access_token", accessToken)
+	if req, err = http.NewRequest(http.MethodPost, d.wxQrcodeURL+"?"+params.Encode(), strings.NewReader(arg)); err != nil {
+		log.Error("Qrcode http.NewRequest error(%v)", err)
+		return
+	}
+	if bs, err = d.httpClient.Raw(c, req); err != nil {
+		log.Error("Qrcode d.httpClient.Do error(%v)", err)
+		return
+	}
+	var res struct {
+		Errcode int    `json:"errcode"`
+		Errmsg  string `json:"errmsg"`
+	}
+	if jsonErr = json.Unmarshal(bs, &res); jsonErr == nil && res.Errcode != ecode.OK.Code() {
+		log.Error("Qrcode errcode error(%d) msg(%s)", res.Errcode, res.Errmsg)
+		err = ecode.RequestErr
+		return
+	}
+	qrcode = bs
+	return
+}
+
+// CacheAccessToken cache access token
+func (d *Dao) CacheAccessToken(c context.Context) (data *wechat.AccessToken, err error) {
+	var (
+		value []byte
+		key   = _accessTokenKey
+		conn  = d.redis.Get(c)
+	)
+	defer conn.Close()
+	if value, err = redis.Bytes(conn.Do("GET", key)); err != nil {
+		if err == redis.ErrNil {
+			err = nil
+		} else {
+			log.Error("CacheAccessToken conn.Do(GET, %s) error(%v)", key, err)
+		}
+		return
+	}
+	data = new(wechat.AccessToken)
+	if err = json.Unmarshal(value, &data); err != nil {
+		log.Error("CacheAccessToken json.Unmarshal(%v) error(%v)", value, err)
+	}
+	return
+}
+
+// AddCacheAccessToken add access token cache
+func (d *Dao) AddCacheAccessToken(c context.Context, data *wechat.AccessToken) (err error) {
+	var (
+		bs   []byte
+		key  = _accessTokenKey
+		conn = d.redis.Get(c)
+	)
+	defer conn.Close()
+	if bs, err = json.Marshal(data); err != nil {
+		log.Error("AddCacheAccessToken json.Marshal(%v) error (%v)", data, err)
+		return
+	}
+	if err = conn.Send("SET", key, bs); err != nil {
+		log.Error("conn.Send(SET, %s, %s) error(%v)", key, string(bs), err)
+		return
+	}
+	expire := data.ExpiresIn - 60
+	if err = conn.Send("EXPIRE", key, expire); err != nil {
+		log.Error("conn.Send(Expire, %s, %d) error(%v)", key, expire, err)
+		return
+	}
+	if err = conn.Flush(); err != nil {
+		log.Error("conn.Flush error(%v)", err)
+		return
+	}
+	for i := 0; i < 2; i++ {
+		if _, err = conn.Receive(); err != nil {
+			log.Error("conn.Receive() error(%v)", err)
+			return
+		}
+	}
+	return
+}