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 * and Distribution License("CDDL") (collectively, the "License").  You
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package com.sun.jersey.oauth.server.api.resources;

import com.sun.jersey.oauth.server.OAuthServerRequest;
import com.sun.jersey.api.core.HttpContext;
import com.sun.jersey.api.representation.Form;
import java.util.logging.Level;
import java.util.logging.Logger;
import javax.ws.rs.core.Context;
import javax.ws.rs.Path;
import javax.ws.rs.Consumes;
import javax.ws.rs.POST;
import javax.ws.rs.WebApplicationException;
import javax.ws.rs.core.Response;
import com.sun.jersey.oauth.signature.OAuthParameters;
import com.sun.jersey.oauth.signature.OAuthSecrets;
import com.sun.jersey.oauth.signature.OAuthSignature;
import com.sun.jersey.oauth.signature.OAuthSignatureException;
import com.sun.jersey.oauth.server.OAuthException;
import com.sun.jersey.oauth.server.spi.OAuthConsumer;
import com.sun.jersey.oauth.server.spi.OAuthProvider;
import com.sun.jersey.oauth.server.spi.OAuthToken;
import javax.ws.rs.Produces;
import javax.ws.rs.core.MediaType;
import javax.ws.rs.core.Request;

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

@Path("/accessToken")
public class AccessTokenRequest {
    private @Context OAuthProvider provider;

    /**
     * POST method for creating a request for Rquest Token
     * @param content representation for the resource
     * @return an HTTP response with content of the updated or created resource.
     */
    @POST
    @Consumes(MediaType.APPLICATION_FORM_URLENCODED)
    @Produces(MediaType.APPLICATION_FORM_URLENCODED)
    public Response postAccessTokenRequest(@Context HttpContext hc, @Context Request req) {
        try {
            boolean sigIsOk = false;
            OAuthServerRequest request = new OAuthServerRequest(hc.getRequest());
            OAuthParameters params = new OAuthParameters();
            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 OAuthException(Response.Status.BAD_REQUEST, null);
            }

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

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

            }

            OAuthSecrets secrets = new OAuthSecrets().consumerSecret(consumer.getSecret()).tokenSecret(rt.getSecret());
            try {
                sigIsOk = OAuthSignature.verify(request, params, secrets);
            } catch (OAuthSignatureException ex) {
                Logger.getLogger(AccessTokenRequest.class.getName()).log(Level.SEVERE, null, ex);
            }

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

            // We're good to go.
            OAuthToken at = provider.newAccessToken(rt, params.getVerifier());
            
            if(at == null) {
                throw new OAuthException(Response.Status.BAD_REQUEST, null);
            }

            // Preparing the response.
            Form resp = new Form();
            resp.putSingle(OAuthParameters.TOKEN, at.getToken());
            resp.putSingle(OAuthParameters.TOKEN_SECRET, at.getSecret());
            resp.putAll(at.getAttributes());
            return Response.ok(resp).build();
        } catch (OAuthException e) {
            // map the exception to avoid having to add the mapper to the providers
            return e.toResponse();
        }
    }
}