org.dmfs.oauth2.client.http.responsehandlers.TokenResponseHandler Maven / Gradle / Ivy

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An OAuth2 client implementation based on http-client-essentials.

There is a newer version: 0.22.1

/*
 * Copyright 2016 dmfs GmbH
 *
 * Licensed 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.dmfs.oauth2.client.http.responsehandlers;

import org.dmfs.httpessentials.client.HttpResponse;
import org.dmfs.httpessentials.client.HttpResponseHandler;
import org.dmfs.httpessentials.exceptions.ProtocolError;
import org.dmfs.httpessentials.exceptions.ProtocolException;
import org.dmfs.httpessentials.responsehandlers.StringResponseHandler;
import org.dmfs.httpessentials.types.MediaType;
import org.dmfs.httpessentials.types.StructuredMediaType;
import org.dmfs.oauth2.client.OAuth2AccessToken;
import org.dmfs.oauth2.client.OAuth2Scope;
import org.dmfs.oauth2.client.tokens.JsonAccessToken;
import org.json.JSONException;
import org.json.JSONObject;

import java.io.IOException;


/**
 * {@link HttpResponseHandler} for OAuth2 token responses.
 *
 * @author Marten Gajda
 */
public final class TokenResponseHandler implements HttpResponseHandler
{
    private final static MediaType APPLICATION_JSON = new StructuredMediaType("application", "json");

    private final OAuth2Scope mScope;


    public TokenResponseHandler(OAuth2Scope scope)
    {
        mScope = scope;
    }


    @Override
    public OAuth2AccessToken handleResponse(HttpResponse response) throws IOException, ProtocolError, ProtocolException
    {
        if (!APPLICATION_JSON.equals(response.responseEntity().contentType().value()))
        {
            throw new ProtocolException(
                String.format("Illegal response content-type %s, exected %s",
                    response.responseEntity().contentType().value(), APPLICATION_JSON));
        }

        String responseString = new StringResponseHandler("UTF-8").handleResponse(response);
        try
        {
            return new JsonAccessToken(new JSONObject(responseString), mScope);
        }
        catch (JSONException e)
        {
            throw new ProtocolException(String.format("Can't decode JSON response %s", responseString), e);
        }
    }
}