1 files changed, 104 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/cors/CORSHeaderProcessor.java b/sca-java-2.x/tags/2.0.1-RC1/modules/common-http/src/main/java/org/apache/tuscany/sca/common/http/cors/CORSHeaderProcessor.java
new file mode 100644
index 0000000000..ffb92f520f
--- /dev/null
+++ b/sca-java-2.x/tags/2.0.1-RC1/modules/common-http/src/main/java/org/apache/tuscany/sca/common/http/cors/CORSHeaderProcessor.java
@@ -0,0 +1,104 @@
+/*
+ * 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.cors;
+
+import java.io.IOException;
+import java.util.List;
+
+import javax.servlet.http.HttpServletRequest;
+import javax.servlet.http.HttpServletResponse;
+
+public class CORSHeaderProcessor {
+    public static void processCORS(CORSConfiguration config, HttpServletRequest request, HttpServletResponse response)
+        throws IOException {
+
+        if (config == null) {
+            String allowHeaders = request.getHeader("Access-Control-Request-Headers");
+            if (allowHeaders == null) {
+                allowHeaders = "Content-Type, Accept, Origin, X-Requested-With";
+            }
+            String allowMethods = request.getHeader("Access-Control-Request-Method");
+            if (allowMethods == null) {
+                allowHeaders = "OPTIONS, HEAD, GET, POST, PUT, DELETE";
+            }
+
+            String allowOrigins = request.getHeader("Origin");
+            if (allowOrigins == null) {
+                allowOrigins = "*";
+            }
+
+            response.setHeader("Access-Control-Allow-Origin", allowOrigins);
+            response.setHeader("Access-Control-Allow-Headers", allowHeaders);
+            response.setHeader("Access-Control-Allow-Credentials", "true");
+            if ("OPTIONS".equalsIgnoreCase(request.getMethod())) {
+                response.setHeader("Access-Control-Allow-Methods", allowMethods);
+                response.setHeader("Access-Control-Max-Age", "1728000");
+            }
+            return;
+        }
+
+        if (config.isAllowCredentials()) {
+            response.setHeader("Access-Control-Allow-Credentials", "true");
+        }
+
+        if (config.getMaxAge() > 0) {
+            response.setHeader("Access-Control-Max-Age", Integer.toString(config.getMaxAge()));
+        }
+
+        response.setHeader("Access-Control-Allow-Origin", getAllowOrigins(config, request));
+        response.setHeader("Access-Control-Allow-Methods", getAllowMethods(config));
+        response.setHeader("Access-Control-Allow-Headers", getAllowHeaders(config));
+        response.setHeader("Access-Control-Expose-Headers", getExposeHeaders(config));
+    }
+
+    private static String getAllowOrigins(CORSConfiguration config, HttpServletRequest request) {
+        String allowOrigins = request.getHeader("Origin");
+        if (allowOrigins == null) {
+            allowOrigins = "*";
+        }
+        return getListValues(config.getAllowOrigins(), allowOrigins);
+    }
+
+    private static String getAllowMethods(CORSConfiguration config) {
+        return getListValues(config.getAllowMethods(), "OPTIONS, HEAD, GET, POST, PUT, DELETE");
+    }
+
+    private static String getAllowHeaders(CORSConfiguration config) {
+        return getListValues(config.getAllowHeaders(), "X-Requested-With, Content-Type, Accept, Origin");
+    }
+
+    private static String getExposeHeaders(CORSConfiguration config) {
+        return getListValues(config.getExposeHeaders(), "X-Requested-With, Content-Type");
+    }
+
+    private static String getListValues(List<String> list, String defaultValue) {
+        StringBuffer values = new StringBuffer();
+        if (list != null && list.isEmpty() == false) {
+            for (String value : list) {
+                values.append(value).append(",");
+            }
+            values.deleteCharAt(values.length());
+        } else {
+            values.append(defaultValue);
+        }
+
+        return values.toString();
+    }
+}