自定义JWT插件转化算法

说明

• 用户可以自定义JWT插件中转化算法

扩展

转化算法的默认实现为 org.apache.shenyu.plugin.jwt.strategy.DefaultJwtConvertStrategy，采用的是SPI机制进行扩展，步骤如下:

1. 实现接口org.apache.shenyu.plugin.jwt.strategy.JwtConvertStrategy

   /**
    * Represents a conversion strategy that convert jwt to some attributes of
    * serverWebExchange, especially attributes of the request header.
    */
   @SPI
   public interface JwtConvertStrategy {
   
       /**
        * HandleJson needs to be parsed into jwtRuleHandle in order to
        * specify how to convert jwt.
        *
        * @param handleJson handleJson from rule
        * @return jwtRuleHandle
        */
       JwtRuleHandle parseHandleJson(String handleJson);
   
       /**
        * Converts jwt to some attributes of serverWebExchange based on jwtRuleHandle.
        *
        * @param jwtRuleHandle jwtRuleHandle
        * @param exchange      exchange
        * @param jwtBody       jwtBody
        * @return serverWebExchange
        */
       ServerWebExchange convert(JwtRuleHandle jwtRuleHandle, ServerWebExchange exchange, Map<String, Object> jwtBody);
   
   }

   @Join
   public class CustomJwtConvertStrategy implements JwtConvertStrategy {
   
       @Override
       public CustomJwtRuleHandle parseHandleJson(final String handleJson) {
   
           return GsonUtils.getInstance().fromJson(handleJson, CustomJwtRuleHandle.class);
       }
   
       @Override
       public ServerWebExchange convert(final JwtRuleHandle jwtRuleHandle, final ServerWebExchange exchange, final Map<String, Object> jwtBody) {
           final CustomJwtRuleHandle customJwtRuleHandle = (CustomJwtRuleHandle) jwtRuleHandle;
           String customConvert = customJwtRuleHandle.getCustomConvert();
           ServerHttpRequest modifiedRequest =
                   exchange.getRequest().mutate().header("custom", customConvert).build();
   
           return exchange.mutate().request(modifiedRequest).build();
       }
   }
   

2. 配置SPI

   custom=org.apache.shenyu.plugin.jwt.strategy.CustomJwtConvertStrategy

说明：系统会根据JwtRuleHandle的handleType参数来使用不同转化策略，比如下面的JwtRuleHandle系统会使用我们上面自定义的CustomJwtConvertStrategy。（注意：handleType为default或者不存在handleType属性，系统默认使用DefaultJwtConvertStrategy）

{
    "handleType":"custom",
 	"customConvert":"customConvert"
}

案例代码可查看org.apache.shenyu.plugin.jwt.strategy.CustomJwtConvertStrategy