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title: Custom Jwt convert Algorithm keywords: [“Custom Jwt Convert”] description: Custom Jwt convert Algorithm

Description

• Users can customize the convert algorithm of Jwt-plugin to achieve convert.

Extension

The default implementation is org.apache.shenyu.plugin.jwt.strategy.DefaultJwtConvertStrategy. The SPI mechanism is adopted for extension, and the steps are as follows:

1. Implements interface 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. Configures SPI

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

The project would use different conversion strategies based on thehandleType parameter of JwtRuleHandle . For example, for the following JwtRuleHandle,the project would use our above CustomJwtConvertStrategy . (Note: handleType is default or nonexistent, the project would use default DefaultJwtConvertStrategy)

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

The case code is available for viewing in org.apache.shenyu.plugin.jwt.strategy.CustomJwtConvertStrategy