1 files changed, 110 insertions, 0 deletions
diff --git a/sca-java-2.x/tags/2.0.1-RC1/modules/common-http/src/main/java/org/apache/tuscany/sca/common/http/HTTPUtils.java b/sca-java-2.x/tags/2.0.1-RC1/modules/common-http/src/main/java/org/apache/tuscany/sca/common/http/HTTPUtils.java
new file mode 100644
index 0000000000..6ab6216522
--- /dev/null
+++ b/sca-java-2.x/tags/2.0.1-RC1/modules/common-http/src/main/java/org/apache/tuscany/sca/common/http/HTTPUtils.java
@@ -0,0 +1,110 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+
+package org.apache.tuscany.sca.common.http;
+
+import java.math.BigInteger;
+import java.security.MessageDigest;
+
+import javax.servlet.http.HttpServletRequest;
+import javax.servlet.http.HttpServletResponse;
+
+/**
+ *
+ *  @tuscany.spi.extension.asclient
+ *
+ */
+public class HTTPUtils {
+
+    /**
+     * Utility method to set common http headers and other stuff in a
+     * default http response. Applications / Extensions can then override and
+     * tweak as they see fit.
+     *
+     * @param response
+     */
+    public static void prepareHTTPResponse(HttpServletResponse response) {
+        response.setDateHeader("Date", System.currentTimeMillis());
+    }
+
+    /**
+     * Calculate the relative request path taking in consideration if
+     * the application is running in a embedded webContatiner or from
+     * within a web application server host environment
+     *
+     * @param request The http request
+     * @return the relative path
+     */
+    public static String getRequestPath(HttpServletRequest request) {
+        // Get the request path
+        String contextPath = request.getContextPath();
+        String servletPath = request.getServletPath();
+        String requestURI = request.getRequestURI();
+
+        int contextPathLength = contextPath.length();
+        int servletPathLenght = servletPath.contains(contextPath) ? servletPath.length() - contextPath.length() : servletPath.length();
+
+        String requestPath = requestURI.substring(contextPathLength + servletPathLenght);
+
+        return requestPath;
+    }
+
+    /**
+     * Calculate the context root for an application taking in consideration if
+     * the application is running in a embedded webContatiner or from
+     * within a web application server host environment.
+     *
+     * In the case of webContainer the contextRoot will always be a empty string.
+     *
+     * @param request The http request
+     * @return the contextRoot
+     */
+    public static String getContextRoot(HttpServletRequest request) {
+        // Get the request path
+        String contextPath = request.getContextPath();
+        String requestURI = request.getRequestURI();
+
+        int contextPathLength = contextPath.length();
+
+        String contextRoot = requestURI.substring(0, contextPathLength);
+
+        return contextRoot;
+    }
+
+    /**
+     * Calculate the ETag using MD5 Hash Algorithm
+     * @param content the content to hash
+     * @return
+     */
+    public static String calculateHashETag(byte[] content) {
+        String eTag = "invalid";
+        try {
+            MessageDigest messageDigest = MessageDigest.getInstance("MD5");
+            byte[] digest = messageDigest.digest(content);
+            BigInteger number = new BigInteger(1, digest);
+            StringBuffer sb = new StringBuffer('0');
+            sb.append(number.toString(16));
+            eTag = sb.toString();
+        } catch(Exception e) {
+            //ignore, we will return random etag
+            eTag =  Integer.toString((new java.util.Random()).nextInt(Integer.MAX_VALUE));
+        }
+        return eTag;
+    }
+}