Change post request body and then proxy pass

[Georgios Papageorgiou]

Hello,

I want to create this scenario.

1)Client make a post request to nginx (e.g a json object)                                       !Done

2)Nginx clojure get the request with an NginxJavaRingHandler                             !Done

3)Nginx clojure change the body of the request(e.g add a new property to json)   !Done

4)Set the new body to request                                                                                !Done

5)Send the new body to proxy pass...                                                                     !Not done. Every time the first request body is passed to proxy. Is like the 4th step not                                                                                                                                         take  effect.

Above are the rewrite handler i use and the nginx.conf.

public class HelloGroovy implements NginxJavaRingHandler {

private static final String HOST_NAME = "{my proxy pass url to make the post}"

private String uri = "";

public Object[] invoke(Map<String, Object> request){

uri = (String) request.get("uri")

NginxJavaRequest r = (NginxJavaRequest) request

String enchancedJson = getEnchancedJson((InputStream) request.get("body"))

/**

* Important...

* Those are the same ? 

* 1) r.put(NginxClojureRT.BODY, enchancedJson)

* 2) r.setVariable(NginxClojureRT.BODY, enchancedJson)

*/

r.put(NginxClojureRT.BODY, enchancedJson)

String url = HOST_NAME.concat(uri)

r.setVariable("mytarget", url)

return PHASE_DONE

}

def getEnchancedJson(InputStream input){

if (input != null) {

def jsonRequest = input.text

def slurper = new JsonSlurper()

def result = slurper.parseText(jsonRequest)

def builder = new JsonBuilder()

def root = builder.test{

id  "1"

time new Timestamp(System.currentTimeMillis())

}

result.test = root.test

return new JsonBuilder(result).toPrettyString()

}

return null

}

}

listen 8080;
server_name localhost;
set $mytarget "";  

location / {

  resolver 8.8.8.8;

  always_read_body on;

                  rewrite_handler_type 'groovy';

                  rewrite_handler_name 'gr.test.HelloGroovy';

  proxy_pass $mytarget;

}

Thanks in advance for the help.

[Yuexiang Zhang]

Hi, rewrite handle can not change request body directly but we can do it by nginx variable and proxy_set_body;

e.g.

set $mytarget "";

set $mybody "";  

location / {

  resolver 8.8.8.8;

  always_read_body on;

                  rewrite_handler_type 'groovy';

                  rewrite_handler_name 'gr.test.HelloGroovy';

                  proxy_set_body $mybody;

  proxy_pass $mytarget;

}

In rewrite handler 

r.setVariable("mybody", new-body-here);

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[Georgios Papageorgiou]

Thanks.... that was what i was looking for...

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