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/*
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
 *
 * Copyright (c) 2010-2013 Oracle and/or its affiliates. All rights reserved.
 *
 * The contents of this file are subject to the terms of either the GNU
 * General Public License Version 2 only ("GPL") or the Common Development
 * and Distribution License("CDDL") (collectively, the "License").  You
 * may not use this file except in compliance with the License.  You can
 * obtain a copy of the License at
 * http://glassfish.java.net/public/CDDL+GPL_1_1.html
 * or packager/legal/LICENSE.txt.  See the License for the specific
 * language governing permissions and limitations under the License.
 *
 * When distributing the software, include this License Header Notice in each
 * file and include the License file at packager/legal/LICENSE.txt.
 *
 * GPL Classpath Exception:
 * Oracle designates this particular file as subject to the "Classpath"
 * exception as provided by Oracle in the GPL Version 2 section of the License
 * file that accompanied this code.
 *
 * Modifications:
 * If applicable, add the following below the License Header, with the fields
 * enclosed by brackets [] replaced by your own identifying information:
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 * If you wish your version of this file to be governed by only the CDDL or
 * only the GPL Version 2, indicate your decision by adding "[Contributor]
 * elects to include this software in this distribution under the [CDDL or GPL
 * Version 2] license."  If you don't indicate a single choice of license, a
 * recipient has the option to distribute your version of this file under
 * either the CDDL, the GPL Version 2 or to extend the choice of license to
 * its licensees as provided above.  However, if you add GPL Version 2 code
 * and therefore, elected the GPL Version 2 license, then the option applies
 * only if the new code is made subject to such option by the copyright
 * holder.
 */

package org.glassfish.jersey.server.oauth1.internal;

import java.net.MalformedURLException;
import java.net.URL;
import java.util.ArrayList;
import java.util.Collections;
import java.util.HashSet;
import java.util.List;
import java.util.Set;
import java.util.logging.Level;
import java.util.logging.Logger;

import javax.ws.rs.container.ContainerRequestContext;
import javax.ws.rs.core.Form;
import javax.ws.rs.core.MediaType;
import javax.ws.rs.core.MultivaluedMap;

import org.glassfish.jersey.internal.util.collection.Value;
import org.glassfish.jersey.internal.util.collection.Values;
import org.glassfish.jersey.oauth1.signature.OAuth1Request;
import org.glassfish.jersey.server.ContainerRequest;

/**
 * Wraps a Jersey {@link ContainerRequestContext} object, implementing the
 * OAuth signature library {@link org.glassfish.jersey.oauth1.signature.OAuth1Request} interface.
 *
 * @author Hubert A. Le Van Gong 
 * @author Paul C. Bryan 
 */
public class OAuthServerRequest implements OAuth1Request {

    private final ContainerRequestContext context;

    private static Set EMPTY_SET = Collections.emptySet();

    private static List EMPTY_LIST = Collections.emptyList();
    private final Value> formParams = Values.lazy(
            new Value>() {
                @Override
                public MultivaluedMap get() {
                    MultivaluedMap params = null;
                    final MediaType mediaType = context.getMediaType();
                    if (mediaType != null && mediaType.equals(MediaType.APPLICATION_FORM_URLENCODED_TYPE)) {
                        final ContainerRequest jerseyRequest = (ContainerRequest) context;
                        jerseyRequest.bufferEntity();
                        final Form form = jerseyRequest.readEntity(Form.class);
                        params = form.asMap();
                    }
                    return params;
                }
            });

    /**
     * Create a new instance.
     *
     * @param context Container request context.
     */
    public OAuthServerRequest(ContainerRequestContext context) {
        this.context = context;
    }

    @Override
    public String getRequestMethod() {
        return context.getMethod();
    }

    @Override
    public URL getRequestURL() {
        try {
            return context.getUriInfo().getRequestUri().toURL();
        } catch (MalformedURLException ex) {
            Logger.getLogger(OAuthServerRequest.class.getName()).log(Level.SEVERE, null, ex);
            return null;
        }
    }

    private static Set keys(MultivaluedMap mvm) {
        if (mvm == null) {
            return EMPTY_SET;
        }
        return mvm.keySet();
    }

    private static List values(MultivaluedMap mvm, String key) {
        if (mvm == null) {
            return EMPTY_LIST;
        }
        List v = mvm.get(key);
        if (v == null) {
            return EMPTY_LIST;
        }
        return v;
    }

    @Override
    public Set getParameterNames() {
        HashSet n = new HashSet();
        n.addAll(keys(context.getUriInfo().getQueryParameters()));
        n.addAll(keys(formParams.get()));

        return n;
    }

    @Override
    public List getParameterValues(String name) {
        ArrayList v = new ArrayList();
        v.addAll(values(context.getUriInfo().getQueryParameters(), name));
        v.addAll(values(formParams.get(), name));
        return v;
    }

    @Override
    public List getHeaderValues(String name) {
        return context.getHeaders().get(name);
    }

    @Override
    public void addHeaderValue(String name, String value) throws IllegalStateException {
        throw new IllegalStateException("Modifying OAuthServerRequest unsupported");
    }

}