ADD 获取红包封面

miniprogram/miniprogram.go

@@ -15,6 +15,7 @@ import (
 	"github.com/silenceper/wechat/v2/miniprogram/order"
 	"github.com/silenceper/wechat/v2/miniprogram/privacy"
 	"github.com/silenceper/wechat/v2/miniprogram/qrcode"
+	"github.com/silenceper/wechat/v2/miniprogram/redpacketcover"
 	"github.com/silenceper/wechat/v2/miniprogram/riskcontrol"
 	"github.com/silenceper/wechat/v2/miniprogram/security"
 	"github.com/silenceper/wechat/v2/miniprogram/shortlink"
@@ -155,3 +156,8 @@ func (miniProgram *MiniProgram) GetShipping() *order.Shipping {
 func (miniProgram *MiniProgram) GetMiniDrama() *minidrama.MiniDrama {
 	return minidrama.NewMiniDrama(miniProgram.ctx)
 }
+
+// GetRedPacketCover 小程序微信红包封面 API
+func (miniProgram *MiniProgram) GetRedPacketCover() *redpacketcover.RedPacketCover {
+	return redpacketcover.NewRedPacketCover(miniProgram.ctx)
+}

miniprogram/redpacketcover/redpacketcover.go

@@ -0,0 +1,69 @@
+package redpacketcover
+
+import (
+	"encoding/json"
+	"fmt"
+	"strings"
+
+	"github.com/silenceper/wechat/v2/miniprogram/context"
+	"github.com/silenceper/wechat/v2/util"
+)
+
+const (
+	getRedPacketCoverUrl = "https://api.weixin.qq.com/redpacketcover/wxapp/cover_url/get_by_token?access_token=%s"
+)
+
+// RedPacketCover struct
+type RedPacketCover struct {
+	*context.Context
+}
+
+// NewRedPacketCover 实例
+func NewRedPacketCover(context *context.Context) *RedPacketCover {
+	redPacketCover := new(RedPacketCover)
+	redPacketCover.Context = context
+	return redPacketCover
+}
+
+// CoverParma 小程序码参数
+type CoverParma struct {
+	// openid 可领取用户的openid
+	OpenID string `json:"openid"`
+	// ctoken 在红包封面平台获取发放ctoken（需要指定可以发放的appid）
+	CToken string `json:"ctoken"`
+}
+
+// fetchCode 请求并返回二维码二进制数据
+func (qrCode *RedPacketCover) fetchCode(urlStr string, body interface{}) (response []byte, err error) {
+	var accessToken string
+	accessToken, err = qrCode.GetAccessToken()
+	if err != nil {
+		return
+	}
+
+	urlStr = fmt.Sprintf(urlStr, accessToken)
+	var contentType string
+	response, contentType, err = util.PostJSONWithRespContentType(urlStr, body)
+	if err != nil {
+		return
+	}
+	if strings.HasPrefix(contentType, "application/json") {
+		// 返回错误信息
+		var result util.CommonError
+		err = json.Unmarshal(response, &result)
+		if err == nil && result.ErrCode != 0 {
+			err = fmt.Errorf("error : errcode=%v , errmsg=%v", result.ErrCode, result.ErrMsg)
+			return nil, err
+		}
+
+		return response, nil
+	}
+	err = fmt.Errorf("error : unknown response content type - %v", contentType)
+	return nil, err
+}
+
+// GetRedPacketCoverUrl 获得指定用户可以领取的红包封面链接。获取参数ctoken参考微信红包封面开放平台
+// 文档地址： https://developers.weixin.qq.com/miniprogram/dev/OpenApiDoc/red-packet-cover/getRedPacketCoverUrl.html
+func (qrCode *RedPacketCover) GetRedPacketCoverUrl(coderParams CoverParma) (response []byte, err error) {
+	return qrCode.fetchCode(getRedPacketCoverUrl, coderParams)
+}