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   1 /**
   2  * Copyright (c) 2010-2021 Contributors to the openHAB project
   3  *
   4  * See the NOTICE file(s) distributed with this work for additional
   5  * information.
   6  *
   7  * This program and the accompanying materials are made available under the
   8  * terms of the Eclipse Public License 2.0 which is available at
   9  * http://www.eclipse.org/legal/epl-2.0
  10  *
  11  * SPDX-License-Identifier: EPL-2.0
  12  */
  13 package org.openhab.binding.http.internal.http;
  14
  15 import java.nio.charset.StandardCharsets;
  16 import java.util.concurrent.CompletableFuture;
  17 import java.util.stream.Collectors;
  18
  19 import org.eclipse.jdt.annotation.NonNullByDefault;
  20 import org.eclipse.jdt.annotation.Nullable;
  21 import org.eclipse.jetty.client.api.Request;
  22 import org.eclipse.jetty.client.api.Response;
  23 import org.eclipse.jetty.client.api.Result;
  24 import org.eclipse.jetty.client.util.BufferingResponseListener;
  25 import org.eclipse.jetty.http.HttpField;
  26 import org.eclipse.jetty.http.HttpStatus;
  27 import org.slf4j.Logger;
  28 import org.slf4j.LoggerFactory;
  29
  30 /**
  31  * The {@link HttpResponseListener} is responsible for processing the result of a HTTP request
  32  *
  33  * @author Jan N. Klug - Initial contribution
  34  */
  35 @NonNullByDefault
  36 public class HttpResponseListener extends BufferingResponseListener {
  37     private final Logger logger = LoggerFactory.getLogger(HttpResponseListener.class);
  38     private final CompletableFuture<@Nullable Content> future;
  39     private final String fallbackEncoding;
  40
  41     /**
  42      * the HttpResponseListener is responsible
  43      *
  44      * @param future Content future to complete with the result of the request
  45      * @param fallbackEncoding a fallback encoding for the content (UTF-8 if null)
  46      * @param bufferSize the buffer size for the content in kB (default 2048 kB)
  47      */
  48     public HttpResponseListener(CompletableFuture<@Nullable Content> future, @Nullable String fallbackEncoding,
  49             int bufferSize) {
  50         super(bufferSize * 1024);
  51         this.future = future;
  52         this.fallbackEncoding = fallbackEncoding != null ? fallbackEncoding : StandardCharsets.UTF_8.name();
  53     }
  54
  55     @Override
  56     public void onComplete(@NonNullByDefault({}) Result result) {
  57         Response response = result.getResponse();
  58         if (logger.isTraceEnabled()) {
  59             logger.trace("Received from '{}': {}", result.getRequest().getURI(), responseToLogString(response));
  60         }
  61         Request request = result.getRequest();
  62         if (result.isFailed()) {
  63             logger.warn("Requesting '{}' (method='{}', content='{}') failed: {}", request.getURI(), request.getMethod(),
  64                     request.getContent(), result.getFailure().getMessage());
  65             future.complete(null);
  66         } else {
  67             switch (response.getStatus()) {
  68                 case HttpStatus.OK_200:
  69                     byte[] content = getContent();
  70                     String encoding = getEncoding();
  71                     if (content != null) {
  72                         future.complete(
  73                                 new Content(content, encoding == null ? fallbackEncoding : encoding, getMediaType()));
  74                     } else {
  75                         future.complete(null);
  76                     }
  77                     break;
  78                 case HttpStatus.UNAUTHORIZED_401:
  79                     logger.debug("Requesting '{}' (method='{}', content='{}') failed: Authorization error",
  80                             request.getURI(), request.getMethod(), request.getContent());
  81                     future.completeExceptionally(new HttpAuthException());
  82                     break;
  83                 default:
  84                     logger.warn("Requesting '{}' (method='{}', content='{}') failed: {} {}", request.getURI(),
  85                             request.getMethod(), request.getContent(), response.getStatus(), response.getReason());
  86                     future.completeExceptionally(new IllegalStateException("Response - Code" + response.getStatus()));
  87             }
  88         }
  89     }
  90
  91     private String responseToLogString(Response response) {
  92         String logString = "Code = {" + response.getStatus() + "}, Headers = {"
  93                 + response.getHeaders().stream().map(HttpField::toString).collect(Collectors.joining(", "))
  94                 + "}, Content = {" + getContentAsString() + "}";
  95         return logString;
  96     }
  97 }