Java: introducing websocket support.

1 files changed, 196 insertions, 0 deletions

diff --git a/src/java/nginx/unit/websocket/server/WsHandshakeRequest.java b/src/java/nginx/unit/websocket/server/WsHandshakeRequest.java
new file mode 100644
index 00000000..fa774302
--- /dev/null
+++ b/src/java/nginx/unit/websocket/server/WsHandshakeRequest.java
@@ -0,0 +1,196 @@
+/*
+ * 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 nginx.unit.websocket.server;
+
+import java.net.URI;
+import java.net.URISyntaxException;
+import java.security.Principal;
+import java.util.Arrays;
+import java.util.Collections;
+import java.util.Enumeration;
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+import java.util.Map.Entry;
+
+import javax.servlet.http.HttpServletRequest;
+import javax.websocket.server.HandshakeRequest;
+
+import org.apache.tomcat.util.collections.CaseInsensitiveKeyMap;
+import org.apache.tomcat.util.res.StringManager;
+
+/**
+ * Represents the request that this session was opened under.
+ */
+public class WsHandshakeRequest implements HandshakeRequest {
+
+    private static final StringManager sm = StringManager.getManager(WsHandshakeRequest.class);
+
+    private final URI requestUri;
+    private final Map<String,List<String>> parameterMap;
+    private final String queryString;
+    private final Principal userPrincipal;
+    private final Map<String,List<String>> headers;
+    private final Object httpSession;
+
+    private volatile HttpServletRequest request;
+
+
+    public WsHandshakeRequest(HttpServletRequest request, Map<String,String> pathParams) {
+
+        this.request = request;
+
+        queryString = request.getQueryString();
+        userPrincipal = request.getUserPrincipal();
+        httpSession = request.getSession(false);
+        requestUri = buildRequestUri(request);
+
+        // ParameterMap
+        Map<String,String[]> originalParameters = request.getParameterMap();
+        Map<String,List<String>> newParameters =
+                new HashMap<>(originalParameters.size());
+        for (Entry<String,String[]> entry : originalParameters.entrySet()) {
+            newParameters.put(entry.getKey(),
+                    Collections.unmodifiableList(
+                            Arrays.asList(entry.getValue())));
+        }
+        for (Entry<String,String> entry : pathParams.entrySet()) {
+            newParameters.put(entry.getKey(),
+                    Collections.unmodifiableList(
+                            Collections.singletonList(entry.getValue())));
+        }
+        parameterMap = Collections.unmodifiableMap(newParameters);
+
+        // Headers
+        Map<String,List<String>> newHeaders = new CaseInsensitiveKeyMap<>();
+
+        Enumeration<String> headerNames = request.getHeaderNames();
+        while (headerNames.hasMoreElements()) {
+            String headerName = headerNames.nextElement();
+
+            newHeaders.put(headerName, Collections.unmodifiableList(
+                    Collections.list(request.getHeaders(headerName))));
+        }
+
+        headers = Collections.unmodifiableMap(newHeaders);
+    }
+
+    @Override
+    public URI getRequestURI() {
+        return requestUri;
+    }
+
+    @Override
+    public Map<String,List<String>> getParameterMap() {
+        return parameterMap;
+    }
+
+    @Override
+    public String getQueryString() {
+        return queryString;
+    }
+
+    @Override
+    public Principal getUserPrincipal() {
+        return userPrincipal;
+    }
+
+    @Override
+    public Map<String,List<String>> getHeaders() {
+        return headers;
+    }
+
+    @Override
+    public boolean isUserInRole(String role) {
+        if (request == null) {
+            throw new IllegalStateException();
+        }
+
+        return request.isUserInRole(role);
+    }
+
+    @Override
+    public Object getHttpSession() {
+        return httpSession;
+    }
+
+    /**
+     * Called when the HandshakeRequest is no longer required. Since an instance
+     * of this class retains a reference to the current HttpServletRequest that
+     * reference needs to be cleared as the HttpServletRequest may be reused.
+     *
+     * There is no reason for instances of this class to be accessed once the
+     * handshake has been completed.
+     */
+    void finished() {
+        request = null;
+    }
+
+
+    /*
+     * See RequestUtil.getRequestURL()
+     */
+    private static URI buildRequestUri(HttpServletRequest req) {
+
+        StringBuffer uri = new StringBuffer();
+        String scheme = req.getScheme();
+        int port = req.getServerPort();
+        if (port < 0) {
+            // Work around java.net.URL bug
+            port = 80;
+        }
+
+        if ("http".equals(scheme)) {
+            uri.append("ws");
+        } else if ("https".equals(scheme)) {
+            uri.append("wss");
+        } else {
+            // Should never happen
+            throw new IllegalArgumentException(
+                    sm.getString("wsHandshakeRequest.unknownScheme", scheme));
+        }
+
+        uri.append("://");
+        uri.append(req.getServerName());
+
+        if ((scheme.equals("http") && (port != 80))
+            || (scheme.equals("https") && (port != 443))) {
+            uri.append(':');
+            uri.append(port);
+        }
+
+        uri.append(req.getRequestURI());
+
+        if (req.getQueryString() != null) {
+            uri.append("?");
+            uri.append(req.getQueryString());
+        }
+
+        try {
+            return new URI(uri.toString());
+        } catch (URISyntaxException e) {
+            // Should never happen
+            throw new IllegalArgumentException(
+                    sm.getString("wsHandshakeRequest.invalidUri", uri.toString()), e);
+        }
+    }
+
+    public Object getAttribute(String name)
+    {
+        return request != null ? request.getAttribute(name) : null;
+    }
+}