ClientAuthInterceptor.java

/*
 * Copyright 2015 Google Inc.
 *
 * 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 io.plaidapp.data.api;

import android.support.annotation.NonNull;
import android.support.annotation.Nullable;
import android.text.TextUtils;

import java.io.IOException;

import okhttp3.HttpUrl;
import okhttp3.Interceptor;
import okhttp3.Request;
import okhttp3.Response;

/**
 * An {@see Interceptor} that adds an auth token to requests if one is provided, otherwise
 * adds a client id.
 */
public class ClientAuthInterceptor implements Interceptor {

    private final String accessToken;
    private final String clientId;
    private final boolean hasAccessToken;

    public ClientAuthInterceptor(@Nullable String accessToken, @NonNull String clientId) {
        if (!TextUtils.isEmpty(accessToken)) {
            this.accessToken = accessToken;
            hasAccessToken = true;
        } else {
            this.accessToken = null;
            hasAccessToken = false;
        }
        this.clientId = clientId;
    }

    @Override
    public Response intercept(Chain chain) throws IOException {
        final Request.Builder requestBuilder = chain.request().newBuilder();
        if (hasAccessToken) {
            requestBuilder.addHeader("Authorization", "Bearer " + accessToken);
        } else {
            final HttpUrl url = chain.request().url().newBuilder()
                    .addQueryParameter("client_id", clientId).build();
            requestBuilder.url(url);
        }
        return chain.proceed(requestBuilder.build());
    }
}