feat: implement telegram bot plugin (#1740)

plugin/telegram/api_get_file.go

@@ -0,0 +1,21 @@
+package telegram
+
+import (
+	"context"
+	"net/url"
+)
+
+// GetFile get download info of File by fileID from Telegram.
+func (r *Robot) GetFile(ctx context.Context, fileID string) (*File, error) {
+	formData := url.Values{
+		"file_id": {fileID},
+	}
+
+	var result File
+	err := r.postForm(ctx, "/getFile", formData, &result)
+	if err != nil {
+		return nil, err
+	}
+
+	return &result, nil
+}