Finish the feature of share and bridge.

code/rest/matter_service.go

@@ -797,6 +797,10 @@ func (this *MatterService) AtomicCrawl(url string, filename string, user *User,
 		panic("资源url必填，并且应该以http://或者https://开头")
 	}
 
+	if filename == "" {
+		panic(result.BadRequest("filename cannot be null."))
+	}
+
 	//从指定的url下载一个文件。参考：https://golangcode.com/download-a-file-from-a-url/
 	resp, err := http.Get(url)
 	this.PanicError(err)