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27 package org.apache.hc.core5.http.nio.support;
28
29 import java.io.IOException;
30
31 import org.apache.hc.core5.annotation.Contract;
32 import org.apache.hc.core5.annotation.ThreadingBehavior;
33 import org.apache.hc.core5.http.EntityDetails;
34 import org.apache.hc.core5.http.HttpException;
35 import org.apache.hc.core5.http.HttpRequest;
36 import org.apache.hc.core5.http.HttpResponse;
37 import org.apache.hc.core5.http.HttpStatus;
38 import org.apache.hc.core5.http.message.BasicHttpResponse;
39 import org.apache.hc.core5.http.nio.AsyncDataConsumer;
40 import org.apache.hc.core5.http.nio.AsyncEntityProducer;
41 import org.apache.hc.core5.http.nio.AsyncFilterChain;
42 import org.apache.hc.core5.http.nio.AsyncFilterHandler;
43 import org.apache.hc.core5.http.support.ExpectSupport;
44 import org.apache.hc.core5.http.support.Expectation;
45 import org.apache.hc.core5.http.protocol.HttpContext;
46
47
48
49
50 @Contract(threading = ThreadingBehavior.STATELESS)
51 public class AsyncServerExpectationFilter implements AsyncFilterHandler {
52
53 protected boolean verify(final HttpRequest request, final HttpContext context) throws HttpException {
54 return true;
55 }
56
57 protected AsyncEntityProducer generateResponseContent(final HttpResponse expectationFailed) throws HttpException {
58 return null;
59 }
60
61 @Override
62 public final AsyncDataConsumer handle(
63 final HttpRequest request,
64 final EntityDetails entityDetails,
65 final HttpContext context,
66 final AsyncFilterChain.ResponseTrigger responseTrigger,
67 final AsyncFilterChain chain) throws HttpException, IOException {
68 final Expectation expectation = ExpectSupport.parse(request, entityDetails);
69 if (expectation == Expectation.CONTINUE) {
70 final boolean verified = verify(request, context);
71 if (verified) {
72 responseTrigger.sendInformation(new BasicHttpResponse(HttpStatus.SC_CONTINUE));
73 } else {
74 final HttpResponse expectationFailed = new BasicHttpResponse(HttpStatus.SC_EXPECTATION_FAILED);
75 final AsyncEntityProducer responseContentProducer = generateResponseContent(expectationFailed);
76 responseTrigger.submitResponse(expectationFailed, responseContentProducer);
77 return null;
78 }
79 } else if (expectation == Expectation.UNKNOWN) {
80 final HttpResponse expectationFailed = new BasicHttpResponse(HttpStatus.SC_EXPECTATION_FAILED);
81 final AsyncEntityProducer responseContentProducer = generateResponseContent(expectationFailed);
82 responseTrigger.submitResponse(expectationFailed, responseContentProducer);
83 return null;
84 }
85 return chain.proceed(request, entityDetails, context, responseTrigger);
86 }
87
88 }