-1package de.juplo.facebook.client;
-2
-3import de.juplo.facebook.exceptions.GraphApiException;
-4import java.io.ByteArrayInputStream;
-5import java.io.IOException;
-6import java.io.InputStream;
-7import java.nio.charset.Charset;
-8import org.slf4j.Logger;
-9import org.slf4j.LoggerFactory;
-10import org.springframework.http.HttpHeaders;
-11import org.springframework.http.HttpStatus;
-12import org.springframework.http.client.ClientHttpResponse;
-13import org.springframework.util.FileCopyUtils;
-14import org.springframework.web.client.ResponseErrorHandler;
-15
-16
-17
-18/**
-19 * Error-Handler for error-messages from the Facebook Graph-API.
-20 * <p>
-21 * This error-handler handels responses withe the HTTP-status code
-22 * {@code 400 BAD REQUEST}. It tries to extract and parse the error-message
-23 * from the HTTP-body. Successfully extracted and parsed messages are mapped
-24 * to a hierarchy of exceptions, that reflects the hierarchy of the error-
-25 * codes and -types.
-26 * <p>
-27 * If the HTTP-status-code of the response is not {@code 400 BAD REQUEST} or
-28 * the HTTP-body could not be extracted or parsed, this error-handler
-29 * delegates the handling to its parent.
-30 *
-31 * @see <a href="https://developers.facebook.com/docs/graph-api/using-graph-api/v2.5#errors">Graph-API Documentation</a>
-32 * @see <a href="http://fbdevwiki.com/wiki/Error_codes">Inofficial Wiki For Facebook-Developers</a>
-33 * @author Kai Moritz
-34 */
-35publicclassGraphApiErrorHandlerimplements ResponseErrorHandler
-36 {
-37privatefinalstatic Logger LOG =
-38 LoggerFactory.getLogger(GraphApiErrorHandler.class);
-39
-40privatefinal ResponseErrorHandler parent;
-41
-42
-43publicGraphApiErrorHandler(ResponseErrorHandler errorHandler)
-44 {
-45this.parent = errorHandler;
-46 }
-47
-48
-49 @Override
-50publicboolean hasError(ClientHttpResponse response) throws IOException
-51 {
-52return
-53 HttpStatus.Series.CLIENT_ERROR.equals(response.getStatusCode().series())
-54 || this.parent.hasError(response);
-55 }
-56
-57 @Override
-58publicvoid handleError(final ClientHttpResponse response) throws IOException
-59 {
-60if (!HttpStatus.BAD_REQUEST.equals(response.getStatusCode()))
-61 {
-62// We will only handle 400 BAD REQUEST
-63 LOG.debug("ignoring response with status-code {}.", response.getStatusCode());
-64 parent.handleError(response);
-65return;
-66 }
-67
-68
-69if (response.getBody() == null)
-70 {
-71// There is no body to interpret in the HTTP-message
-72 LOG.warn("Could not convert the response into an exception, because there is no message-body.");
-73 parent.handleError(response);
-74return;
-75 }
-76
-77final byte[] body = FileCopyUtils.copyToByteArray(response.getBody());
-78GraphApiException error;
-79
-80try
-81 {
-82 error = GraphApiException.create(body);
-83if (LOG.isInfoEnabled())
-84 LOG.info("error-response: {}", new String(body, Charset.forName("UTF-8")));
-85 }
-86catch (Exception e)
-87 {
-88// The body of the HTTP-message could not be parsed.
-89// Let the parent error-handler try to handle the response.
-90
-91 LOG.warn("Could not convert the response into an exception, because the body is unparsable: {}", body);
-92
-93// To do so, we have to wrap the original response to fill in
-94// the buffered body, if needed
-95 ClientHttpResponse buffered = new ClientHttpResponse()
-96 {
-97 @Override
-98public HttpStatus getStatusCode() throws IOException
-99 {
-100return response.getStatusCode();
-101 }
-102
-103 @Override
-104publicsynchronized InputStream getBody() throws IOException
-105 {
-106returnnew ByteArrayInputStream(body);
-107 }
-108
-109 @Override
-110public HttpHeaders getHeaders()
-111 {
-112return response.getHeaders();
-113 }
-114
-115 @Override
-116public String getStatusText() throws IOException
-117 {
-118return response.getStatusText();
-119 }
-120
-121 @Override
-122publicvoid close()
-123 {
-124 response.close();
-125 }
-126
-127 @Override
-128publicint getRawStatusCode() throws IOException
-129 {
-130return response.getRawStatusCode();
-131 }
-132 };
-133
-134 parent.handleError(buffered);
-135return;
-136 }
-137
-138throw error;
-139 }
-140 }
-