增加shortlink.generate (#467)

* init

* init

* init

* 小程序 shortLink

miniprogram/miniprogram.go

@@ -10,6 +10,7 @@ import (
 	"github.com/silenceper/wechat/v2/miniprogram/encryptor"
 	"github.com/silenceper/wechat/v2/miniprogram/message"
 	"github.com/silenceper/wechat/v2/miniprogram/qrcode"
+	"github.com/silenceper/wechat/v2/miniprogram/shortlink"
 	"github.com/silenceper/wechat/v2/miniprogram/subscribe"
 	"github.com/silenceper/wechat/v2/miniprogram/tcb"
 	"github.com/silenceper/wechat/v2/miniprogram/werun"
@@ -84,3 +85,8 @@ func (miniProgram *MiniProgram) GetWeRun() *werun.WeRun {
 func (miniProgram *MiniProgram) GetContentSecurity() *content.Content {
 	return content.NewContent(miniProgram.ctx)
 }
+
+// GetShortLink 小程序短链接口
+func (miniProgram *MiniProgram) GetShortLink() *shortlink.ShortLink {
+	return shortlink.NewShortLink(miniProgram.ctx)
+}

miniprogram/shortlink/shortlink.go

@@ -0,0 +1,86 @@
+package shortlink
+
+import (
+	"fmt"
+
+	"github.com/silenceper/wechat/v2/miniprogram/context"
+	"github.com/silenceper/wechat/v2/util"
+)
+
+const (
+	generateShortLinkURL = "https://api.weixin.qq.com/wxa/genwxashortlink?access_token=%s"
+)
+
+// ShortLink 短链接
+type ShortLink struct {
+	*context.Context
+}
+
+// NewShortLink 实例
+func NewShortLink(ctx *context.Context) *ShortLink {
+	return &ShortLink{ctx}
+}
+
+// ShortLinker 请求结构体
+type ShortLinker struct {
+
+	// pageUrl 通过 Short Link 进入的小程序页面路径，必须是已经发布的小程序存在的页面，可携带 query，最大1024个字符
+	PageURL string `json:"page_url"`
+
+	// pageTitle 页面标题，不能包含违法信息，超过20字符会用... 截断代替
+	PageTitle string `json:"page_title"`
+
+	// isPermanent 生成的 Short Link 类型，短期有效：false，永久有效：true
+	IsPermanent bool `json:"is_permanent,omitempty"`
+}
+
+// resShortLinker 返回结构体
+type resShortLinker struct {
+	// 通用错误
+	*util.CommonError
+
+	// 返回的 shortLink
+	Link string `json:"link"`
+}
+
+// Generate 生成 shortLink
+func (shortLink *ShortLink) generate(shortLinkParams ShortLinker) (string, error) {
+	var accessToken string
+	accessToken, err := shortLink.GetAccessToken()
+	if err != nil {
+		return "", err
+	}
+
+	urlStr := fmt.Sprintf(generateShortLinkURL, accessToken)
+	response, err := util.PostJSON(urlStr, shortLinkParams)
+	if err != nil {
+		return "", err
+	}
+
+	// 使用通用方法返回错误
+	var res resShortLinker
+	err = util.DecodeWithError(response, &res, "GenerateShortLink")
+	if err != nil {
+		return "", err
+	}
+
+	return res.Link, nil
+}
+
+// GenerateShortLinkPermanent 生成永久shortLink
+func (shortLink *ShortLink) GenerateShortLinkPermanent(PageURL, pageTitle string) (string, error) {
+	return shortLink.generate(ShortLinker{
+		PageURL:     PageURL,
+		PageTitle:   pageTitle,
+		IsPermanent: true,
+	})
+}
+
+// GenerateShortLinkTemp 生成临时shortLink
+func (shortLink *ShortLink) GenerateShortLinkTemp(PageURL, pageTitle string) (string, error) {
+	return shortLink.generate(ShortLinker{
+		PageURL:     PageURL,
+		PageTitle:   pageTitle,
+		IsPermanent: false,
+	})
+}