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 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
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 *
 *     http://www.apache.org/licenses/LICENSE-2.0
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package io.undertow.server.handlers;

import java.util.Collections;
import java.util.Map;
import java.util.Set;

import org.xnio.conduits.StreamSinkConduit;
import io.undertow.conduits.StoredResponseStreamSinkConduit;
import io.undertow.server.ConduitWrapper;
import io.undertow.server.HandlerWrapper;
import io.undertow.server.HttpHandler;
import io.undertow.server.HttpServerExchange;
import io.undertow.server.handlers.builder.HandlerBuilder;
import io.undertow.util.ConduitFactory;

A handler that buffers the full response and attaches it to the exchange. This makes use of StoredResponseStreamSinkConduit 
 This will be made available once the response is fully complete, so should generally be read in an ExchangeCompletionListener 
Author:
Stuart Douglas/**
 * A handler that buffers the full response and attaches it to the exchange. This makes use of
 * {@link StoredResponseStreamSinkConduit}
 * <p>
 * This will be made available once the response is fully complete, so should generally
 * be read in an {@link io.undertow.server.ExchangeCompletionListener}
 *
 * @author Stuart Douglas
 */
public class StoredResponseHandler implements HttpHandler {

    private final HttpHandler next;

    public StoredResponseHandler(HttpHandler next) {
        this.next = next;
    }

    @Override
    public void handleRequest(HttpServerExchange exchange) throws Exception {
        exchange.addResponseWrapper(new ConduitWrapper<StreamSinkConduit>() {
            @Override
            public StreamSinkConduit wrap(ConduitFactory<StreamSinkConduit> factory, HttpServerExchange exchange) {
                return new StoredResponseStreamSinkConduit(factory.create(), exchange);
            }
        });
        next.handleRequest(exchange);
    }

    public static class Builder implements HandlerBuilder {

        @Override
        public String name() {
            return "store-response";
        }

        @Override
        public Map<String, Class<?>> parameters() {
            return Collections.emptyMap();
        }

        @Override
        public Set<String> requiredParameters() {
            return Collections.emptySet();
        }

        @Override
        public String defaultParameter() {
            return null;
        }

        @Override
        public HandlerWrapper build(Map<String, Object> config) {
            return new HandlerWrapper() {
                @Override
                public HttpHandler wrap(HttpHandler handler) {
                    return new StoredResponseHandler(handler);
                }
            };
        }
    }

}