OAuthRequestWrapper.java

/*
 * Copyright (c) 2013, WSO2 Inc. (http://www.wso2.org) All Rights Reserved.
 *
 * WSO2 Inc. 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.wso2.carbon.identity.oauth.endpoint;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletRequestWrapper;
import javax.ws.rs.core.MultivaluedMap;
import java.util.Collections;
import java.util.Enumeration;
import java.util.HashSet;
import java.util.Set;

public class OAuthRequestWrapper extends HttpServletRequestWrapper {
    private MultivaluedMap<String, String> form;
    private Enumeration<String> parameterNames;

    public OAuthRequestWrapper(HttpServletRequest request, MultivaluedMap<String, String> form) {
        super(request);
        this.form = form;

        Set<String> parameterNameSet = new HashSet<String>();
        // Add post parameters
        parameterNameSet.addAll(form.keySet());
        // Add servlet request parameters
        Enumeration<String> requestParameterNames = request.getParameterNames();
        while (requestParameterNames.hasMoreElements()) {
            parameterNameSet.add(requestParameterNames.nextElement());
        }

        this.parameterNames = Collections.enumeration(parameterNameSet);
    }

    @Override
    public String getParameter(String name) {
        String value = super.getParameter(name);
        if (value == null) {
            value = form.getFirst(name);
        }
        return value;
    }

    @Override
    public Enumeration<String> getParameterNames() {
        return parameterNames;
    }
}