1 files changed, 247 insertions, 0 deletions
diff --git a/sandbox/sebastien/java/extend/modules/host-webapp/src/main/java/org/apache/tuscany/sca/host/webapp/WebAppHelper.java b/sandbox/sebastien/java/extend/modules/host-webapp/src/main/java/org/apache/tuscany/sca/host/webapp/WebAppHelper.java
new file mode 100644
index 0000000000..655e19c88c
--- /dev/null
+++ b/sandbox/sebastien/java/extend/modules/host-webapp/src/main/java/org/apache/tuscany/sca/host/webapp/WebAppHelper.java
@@ -0,0 +1,247 @@
+/*
+ * 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.host.webapp;
+
+import java.io.File;
+import java.io.IOException;
+import java.net.URI;
+import java.net.URISyntaxException;
+import java.net.URL;
+import java.util.Enumeration;
+
+import javax.servlet.ServletConfig;
+import javax.servlet.ServletContext;
+import javax.servlet.ServletException;
+
+import org.apache.tuscany.sca.core.ExtensionPointRegistry;
+import org.apache.tuscany.sca.host.http.ServletHost;
+import org.apache.tuscany.sca.host.http.ServletHostExtensionPoint;
+import org.apache.tuscany.sca.node.Node;
+import org.apache.tuscany.sca.node.NodeFactory;
+import org.apache.tuscany.sca.node.configuration.NodeConfiguration;
+
+public class WebAppHelper {
+    private static final String ROOT = "/";
+    // The prefix for the parameters in web.xml which configure the folders that contain SCA contributions
+    private static final String CONTRIBUTIONS = "contributions";
+    // The prefix for the parameters in web.xml which configure the individual SCA contributions
+    private static final String CONTRIBUTION = "contribution";
+    private static final String NODE_CONFIGURATION = "node.configuration";
+    private static final String WEB_COMPOSITE = "/WEB-INF/web.composite";
+    private static final String DOMAIN_URI = "domain.uri";
+    private static final String NODE_URI = "node.uri";
+    public static final String DOMAIN_NAME_ATTR = "org.apache.tuscany.sca.domain.name";
+    public static final String SCA_NODE_ATTRIBUTE = Node.class.getName();
+    private static NodeFactory factory;
+    private static WebAppServletHost host;
+
+    private static URL getResource(ServletContext servletContext, String location) throws IOException {
+        URI uri = URI.create(location);
+        if (uri.isAbsolute()) {
+            return uri.toURL();
+        } else {
+            String path = location;
+            if (!path.startsWith(ROOT)) {
+                path = ROOT + path;
+            }
+            URL url = servletContext.getResource(path);
+            if (url != null && url.getProtocol().equals("jndi")) {
+                //this is Tomcat case, we should use getRealPath
+                File warRootFile = new File(servletContext.getRealPath(path));
+                return warRootFile.toURI().toURL();
+            } else {
+                //this is Jetty case
+                return url;
+            }
+        }
+    }
+
+    @SuppressWarnings("unchecked")
+    private static NodeConfiguration getNodeConfiguration(ServletContext servletContext) throws IOException,
+        URISyntaxException {
+        NodeConfiguration configuration = null;
+        String nodeConfigURI = (String)servletContext.getAttribute(NODE_CONFIGURATION);
+        if (nodeConfigURI != null) {
+            URL url = getResource(servletContext, nodeConfigURI);
+            configuration = factory.loadConfiguration(url.openStream(), url);
+        } else {
+            configuration = factory.createNodeConfiguration();
+            Enumeration<String> names = servletContext.getAttributeNames();
+            while (names.hasMoreElements()) {
+                String name = names.nextElement();
+                if (name.equals(CONTRIBUTION) || name.startsWith(CONTRIBUTION + ".")) {
+                    // We need to have a way to select one or more folders within the webapp as the contributions
+                    String contrib = (String)servletContext.getAttribute(name);
+                    if (contrib != null) {
+                        File f = new File(getResource(servletContext, contrib).toURI());
+                        configuration.addContribution(f.toURI().toURL());
+                    }
+                } else if (name.equals(CONTRIBUTIONS) || name.startsWith(CONTRIBUTIONS + ".")) {
+                    String contrib = (String)servletContext.getAttribute(name);
+                    if (contrib != null) {
+                        File f = new File(getResource(servletContext, contrib).toURI());
+                        if (f.isDirectory()) {
+                            for (File n : f.listFiles()) {
+                                configuration.addContribution(n.toURI().toURL());
+                            }
+                        } else {
+                            configuration.addContribution(f.toURI().toURL());
+                        }
+                    }
+                }
+            }
+
+            if (configuration.getContributions().isEmpty()) {
+                // TODO: Which path should be the default root
+                configuration.addContribution(getResource(servletContext, ROOT));
+            }
+            URL composite = getResource(servletContext, WEB_COMPOSITE);
+            if (composite != null) {
+                configuration.getContributions().get(0).addDeploymentComposite(composite);
+            }
+            String nodeURI = (String)servletContext.getAttribute(NODE_URI);
+            if (nodeURI == null) {
+                nodeURI = new File(servletContext.getRealPath(ROOT)).getName();
+            }
+            configuration.setURI(nodeURI);
+            String domainURI = (String)servletContext.getAttribute(DOMAIN_URI);
+            if (domainURI != null) {
+                configuration.setDomainURI(domainURI);
+            } else {
+                domainURI = servletContext.getInitParameter("org.apache.tuscany.sca.defaultDomainURI");
+                if (domainURI != null) {
+                    configuration.setDomainURI(getDomainName(domainURI));
+                    configuration.setDomainRegistryURI(domainURI);
+                }
+            }
+        }
+        return configuration;
+    }
+
+    // TODO: Temp for now to get the old samples working till i clean up all the domain uri/name after the ML discussion.
+    private static String getDomainName(String configURI) {
+        String domainName;
+        if (configURI.startsWith("tuscany:vm:")) {
+            domainName = configURI.substring("tuscany:vm:".length());
+        } else if (configURI.startsWith("tuscany:")) {
+            int i = configURI.indexOf('?');
+            if (i == -1) {
+                domainName = configURI.substring("tuscany:".length());
+            } else {
+                domainName = configURI.substring("tuscany:".length(), i);
+            }
+        } else {
+            domainName = configURI;
+        }
+        return domainName;
+    }
+
+    public synchronized static ServletHost init(final ServletContext servletContext) {
+        if (host == null) {
+            try {
+
+                String configValue = servletContext.getInitParameter("org.apache.tuscany.sca.config");
+                if (configValue != null) {
+                    factory = NodeFactory.newInstance(configValue);
+                } else {
+                    factory = NodeFactory.newInstance();
+                }
+                ExtensionPointRegistry registry = factory.getExtensionPointRegistry();
+                ServletHostExtensionPoint servletHosts = registry.getExtensionPoint(ServletHostExtensionPoint.class);
+                servletHosts.setWebApp(true);
+
+                // TODO: why are the init parameters copied to the attributes?
+                for (Enumeration<?> e = servletContext.getInitParameterNames(); e.hasMoreElements();) {
+                    String name = (String)e.nextElement();
+                    String value = servletContext.getInitParameter(name);
+                    servletContext.setAttribute(name, value);
+                }
+
+                host = getServletHost(servletContext);
+
+            } catch (ServletException e) {
+                throw new RuntimeException(e);
+            }
+        }
+        Node node = (Node)servletContext.getAttribute(SCA_NODE_ATTRIBUTE);
+        if (node == null) {
+            try {
+                node = createAndStartNode(servletContext);
+            } catch (ServletException e) {
+                throw new RuntimeException(e);
+            }
+            servletContext.setAttribute(SCA_NODE_ATTRIBUTE, node);
+        }
+
+        return host;
+    }
+
+    private static WebAppServletHost getServletHost(final ServletContext servletContext) throws ServletException {
+        WebAppServletHost host = getServletHost(factory);
+        host.init(new ServletConfig() {
+            public String getInitParameter(String name) {
+                return servletContext.getInitParameter(name);
+            }
+
+            public Enumeration<?> getInitParameterNames() {
+                return servletContext.getInitParameterNames();
+            }
+
+            public ServletContext getServletContext() {
+                return servletContext;
+            }
+
+            public String getServletName() {
+                return servletContext.getServletContextName();
+            }
+        });
+        return host;
+    }
+
+    private static WebAppServletHost getServletHost(NodeFactory factory) {
+        ExtensionPointRegistry registry = factory.getExtensionPointRegistry();
+        return (WebAppServletHost)org.apache.tuscany.sca.host.http.ServletHostHelper.getServletHost(registry);
+    }
+
+    private static Node createAndStartNode(final ServletContext servletContext) throws ServletException {
+        NodeConfiguration configuration;
+        try {
+            configuration = getNodeConfiguration(servletContext);
+        } catch (IOException e) {
+            throw new ServletException(e);
+        } catch (URISyntaxException e) {
+            throw new ServletException(e);
+        }
+        Node node = factory.createNode(configuration).start();
+        return node;
+    }
+
+    public static void stop(ServletContext servletContext) {
+        Node node = (Node)servletContext.getAttribute(SCA_NODE_ATTRIBUTE);
+        if (node != null) {
+            node.stop();
+            servletContext.setAttribute(SCA_NODE_ATTRIBUTE, null);
+        }
+    }
+
+    public static NodeFactory getNodeFactory() {
+        return factory;
+    }
+}