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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:
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 * exception as provided by Oracle in the GPL Version 2 section of the License
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package org.glassfish.jersey.server.oauth1.internal;

import java.util.logging.Level;
import java.util.logging.Logger;

import javax.inject.Inject;
import javax.ws.rs.Consumes;
import javax.ws.rs.POST;
import javax.ws.rs.Path;
import javax.ws.rs.Produces;
import javax.ws.rs.WebApplicationException;
import javax.ws.rs.container.ContainerRequestContext;
import javax.ws.rs.core.Context;
import javax.ws.rs.core.Form;
import javax.ws.rs.core.MediaType;
import javax.ws.rs.core.Request;
import javax.ws.rs.core.Response;

import org.glassfish.jersey.oauth1.signature.OAuth1Parameters;
import org.glassfish.jersey.oauth1.signature.OAuth1Secrets;
import org.glassfish.jersey.oauth1.signature.OAuth1Signature;
import org.glassfish.jersey.oauth1.signature.OAuth1SignatureException;
import org.glassfish.jersey.server.oauth1.OAuth1Consumer;
import org.glassfish.jersey.server.oauth1.OAuth1Exception;
import org.glassfish.jersey.server.oauth1.OAuth1Provider;
import org.glassfish.jersey.server.oauth1.OAuth1Token;
import org.glassfish.jersey.server.oauth1.TokenResource;


/**
 * Resource handling access token requests.
 *
 * @author Hubert A. Le Van Gong 
 * @author Martin Matula
 */

@Path("/accessToken")
public class AccessTokenResource {
    @Inject
    private OAuth1Provider provider;

    @Inject
    private OAuth1Signature oAuth1Signature;

    /**
     * POST method for creating a request for Request Token.
     * @return an HTTP response with content of the updated or created resource.
     */
    @POST
    @Consumes(MediaType.APPLICATION_FORM_URLENCODED)
    @Produces(MediaType.APPLICATION_FORM_URLENCODED)
    @TokenResource
    public Response postAccessTokenRequest(@Context ContainerRequestContext requestContext, @Context Request req) {
        boolean sigIsOk = false;
        OAuthServerRequest request = new OAuthServerRequest(requestContext);
        OAuth1Parameters params = new OAuth1Parameters();
        params.readRequest(request);

        if (params.getToken() == null) {
            throw new WebApplicationException(new Throwable("oauth_token MUST be present."), 400);
        }

        String consKey = params.getConsumerKey();
        if (consKey == null) {
            throw new OAuth1Exception(Response.Status.BAD_REQUEST, null);
        }

        OAuth1Token rt = provider.getRequestToken(params.getToken());
        if (rt == null) {
            // token invalid
            throw new OAuth1Exception(Response.Status.BAD_REQUEST, null);
        }

        OAuth1Consumer consumer = rt.getConsumer();
        if (consumer == null || !consKey.equals(consumer.getKey())) {
            // token invalid
            throw new OAuth1Exception(Response.Status.BAD_REQUEST, null);

        }

        OAuth1Secrets secrets = new OAuth1Secrets().consumerSecret(consumer.getSecret()).tokenSecret(rt.getSecret());
        try {
            sigIsOk = oAuth1Signature.verify(request, params, secrets);
        } catch (OAuth1SignatureException ex) {
            Logger.getLogger(AccessTokenResource.class.getName()).log(Level.SEVERE, null, ex);
        }

        if (!sigIsOk) {
            // signature invalid
            throw new OAuth1Exception(Response.Status.BAD_REQUEST, null);
        }

        // We're good to go.
        OAuth1Token at = provider.newAccessToken(rt, params.getVerifier());

        if (at == null) {
            throw new OAuth1Exception(Response.Status.BAD_REQUEST, null);
        }

        // Preparing the response.
        Form resp = new Form();
        resp.param(OAuth1Parameters.TOKEN, at.getToken());
        resp.param(OAuth1Parameters.TOKEN_SECRET, at.getSecret());
        resp.asMap().putAll(at.getAttributes());
        return Response.ok(resp).build();
    }
}