EWS: implement gzip encoding on response

git-svn-id: http://svn.code.sf.net/p/davmail/code/trunk@1705 3d1905a2-6b24-0410-a738-b14d5a86fcbd

src/java/davmail/exchange/dav/DavExchangeSession.java

@@ -1997,7 +1997,7 @@ public class DavExchangeSession extends ExchangeSession {
             InputStream inputStream = null;
             try {
                 DavGatewayHttpClientFacade.executeGetMethod(httpClient, method, true);
-                if (isGzipEncoded(method)) {
+                if (DavGatewayHttpClientFacade.isGzipEncoded(method)) {
                     inputStream = (new GZIPInputStream(method.getResponseBodyAsStream()));
                 } else {
                     inputStream = method.getResponseBodyAsStream();
@@ -2425,18 +2425,6 @@ public class DavExchangeSession extends ExchangeSession {
         }
     }
 
-    protected boolean isGzipEncoded(HttpMethod method) {
-        Header[] contentEncodingHeaders = method.getResponseHeaders("Content-Encoding");
-        if (contentEncodingHeaders != null) {
-            for (Header header : contentEncodingHeaders) {
-                if ("gzip".equals(header.getValue())) {
-                    return true;
-                }
-            }
-        }
-        return false;
-    }
-
     // wrong hostname fix flag
     protected boolean restoreHostName;
 
@@ -2568,7 +2556,7 @@ public class DavExchangeSession extends ExchangeSession {
         InputStream inputStream;
         try {
             DavGatewayHttpClientFacade.executeGetMethod(httpClient, method, true);
-            if (isGzipEncoded(method)) {
+            if (DavGatewayHttpClientFacade.isGzipEncoded(method)) {
                 inputStream = new GZIPInputStream(method.getResponseBodyAsStream());
             } else {
                 inputStream = method.getResponseBodyAsStream();

src/java/davmail/exchange/ews/EWSMethod.java

@@ -19,6 +19,7 @@
 package davmail.exchange.ews;
 
 import davmail.exchange.XMLStreamUtil;
+import davmail.http.DavGatewayHttpClientFacade;
 import davmail.util.StringUtil;
 import org.apache.commons.codec.binary.Base64;
 import org.apache.commons.httpclient.Header;
@@ -35,6 +36,7 @@ import javax.xml.stream.XMLStreamException;
 import javax.xml.stream.XMLStreamReader;
 import java.io.*;
 import java.util.*;
+import java.util.zip.GZIPInputStream;
 
 /**
  * EWS SOAP method.
@@ -102,6 +104,7 @@ public abstract class EWSMethod extends PostMethod {
         this.itemType = itemType;
         this.methodName = methodName;
         this.responseCollectionName = responseCollectionName;
+        setRequestHeader("Accept-Encoding", "gzip");
         setRequestEntity(new RequestEntity() {
             byte[] content;
 
@@ -988,7 +991,11 @@ public abstract class EWSMethod extends PostMethod {
         Header contentTypeHeader = getResponseHeader("Content-Type");
         if (contentTypeHeader != null && "text/xml; charset=utf-8".equals(contentTypeHeader.getValue())) {
             try {
+                if (DavGatewayHttpClientFacade.isGzipEncoded(this)) {
+                    processResponseStream(new GZIPInputStream(getResponseBodyAsStream()));
+                } else {
                     processResponseStream(getResponseBodyAsStream());
+                }
             } catch (IOException e) {
                 LOGGER.error("Error while parsing soap response: " + e, e);
             }

src/java/davmail/http/DavGatewayHttpClientFacade.java

@@ -663,6 +663,23 @@ public final class DavGatewayHttpClientFacade {
         }
     }
 
+    /**
+     * Test if the method response is gzip encoded
+     * @param method http method
+     * @return true if response is gzip encoded
+     */
+    public static boolean isGzipEncoded(HttpMethod method) {
+        Header[] contentEncodingHeaders = method.getResponseHeaders("Content-Encoding");
+        if (contentEncodingHeaders != null) {
+            for (Header header : contentEncodingHeaders) {
+                if ("gzip".equals(header.getValue())) {
+                    return true;
+                }
+            }
+        }
+        return false;
+    }
+
     /**
      * Stop HttpConnectionManager.
      */