feat(bot): export feeds

bot/bot.go

@@ -194,8 +194,33 @@ func makeHandle() {
 	})
 
 	B.Handle("/export", func(m *tb.Message) {
+		sourceList, err := model.GetSourcesByUserID(m.Chat.ID)
 
-		_, _ = B.Send(m.Chat, fmt.Sprintf("export"))
+		if err != nil {
+			log.Println(err.Error())
+			_, _ = B.Send(m.Chat, fmt.Sprintf("导出失败"))
+			return
+		}
+
+		if len(sourceList) == 0 {
+			_, _ = B.Send(m.Chat, fmt.Sprintf("订阅列表为空"))
+			return
+		}
+
+		opmlStr, err := ToOPML(sourceList)
+
+		if err != nil {
+			_, _ = B.Send(m.Chat, fmt.Sprintf("导出失败"))
+			return
+		}
+		opmlFile := &tb.Document{File: tb.FromReader(strings.NewReader(opmlStr))}
+		opmlFile.FileName = "subscriptions.opml"
+		_, err = B.Send(m.Chat, opmlFile)
+
+		if err != nil {
+			_, _ = B.Send(m.Chat, fmt.Sprintf("导出失败"))
+			log.Println("[export]", err)
+		}
 	})
 
 	B.Handle("/sub", func(m *tb.Message) {
@@ -445,7 +470,8 @@ func makeHandle() {
 /list 查看当前订阅源
 /set 设置订阅
 /help 帮助
-/import 导入OPML文件
+/import 导入 OPML 文件
+/export 导出 OPML 文件
 详细使用方法请看：https://github.com/indes/flowerss-bot
 `
 		_, _ = B.Send(m.Chat, message)

bot/opml.go

@@ -3,6 +3,7 @@ package bot
 import (
 	"crypto/tls"
 	"encoding/xml"
+	"github.com/indes/flowerss-bot/model"
 	"io/ioutil"
 	"net/http"
 	"net/url"
@@ -114,3 +115,20 @@ func (o OPML) XML() (string, error) {
 	b, err := xml.MarshalIndent(o, "", "\t")
 	return xml.Header + string(b), err
 }
+
+func ToOPML(sources []model.Source) (string, error) {
+	O := OPML{}
+	O.XMLName.Local = "opml"
+	O.Version = "2.0"
+	O.XMLName.Space = ""
+	O.Head.Title = "subscriptions in flowerss"
+	O.Head.DateCreated = time.Now().Format(time.RFC1123)
+	for _, s := range sources {
+		outline := Outline{}
+		outline.Text = s.Title
+		outline.Type = "rss"
+		outline.XMLURL = s.Link
+		O.Body.Outlines = append(O.Body.Outlines, outline)
+	}
+	return O.XML()
+}

model/source.go

@@ -136,6 +136,7 @@ func GetSourcesByUserID(userID int64) ([]Source, error) {
 
 	return sources, nil
 }
+
 func (s *Source) AddErrorCount() {
 	s.ErrorCount++
 	s.Save()