com.feedeo.shopify.web.client.rest.ShopifyOAuth2RestClient.java Source code

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Here is the source code for com.feedeo.shopify.web.client.rest.ShopifyOAuth2RestClient.java

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/*
 * The MIT License (MIT)
 *
 * Copyright (c) 2016, Feedeo AB <hugo@feedeo.io>.
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in all
 * copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 */

package com.feedeo.shopify.web.client.rest;

import com.feedeo.rest.client.AbstractOAuth2RestClient;
import com.google.common.io.ByteSource;
import com.google.common.io.Resources;
import org.springframework.http.client.ClientHttpRequest;
import org.springframework.security.oauth2.client.OAuth2ClientContext;
import org.springframework.security.oauth2.client.OAuth2RequestAuthenticator;
import org.springframework.security.oauth2.client.OAuth2RestTemplate;
import org.springframework.security.oauth2.client.http.AccessTokenRequiredException;
import org.springframework.security.oauth2.client.resource.OAuth2ProtectedResourceDetails;
import org.springframework.security.oauth2.common.OAuth2AccessToken;

import java.io.IOException;
import java.io.InputStream;
import java.net.URL;
import java.util.Properties;

import static com.google.common.base.Preconditions.checkArgument;
import static com.google.common.base.Strings.isNullOrEmpty;

public class ShopifyOAuth2RestClient extends AbstractOAuth2RestClient {
    private static ShopifyOAuth2RestClient instance = null;

    private ShopifyOAuth2RestClient(String clientId, String clientSecret) {
        super(clientId, clientSecret);
    }

    public static ShopifyOAuth2RestClient getInstance() {
        if (instance == null) {
            synchronized (ShopifyOAuth2RestClient.class) {
                if (instance == null) {
                    instance = createSingleton();
                }
            }
        }
        return instance;
    }

    private static ShopifyOAuth2RestClient createSingleton() {
        Properties properties = getProperties();

        String clientId = getClientIdFromProperties(properties);
        String clientSecret = getClientSecretFromProperties(properties);

        ShopifyOAuth2RestClient client = new ShopifyOAuth2RestClient(clientId, clientSecret);

        OAuth2RestTemplate restOperations = (OAuth2RestTemplate) client.getRestOperations();
        restOperations.setAuthenticator(new ShopifyOAuth2RequestAuthenticator());

        return client;
    }

    private static Properties getProperties() {
        final Properties properties = new Properties();

        final URL url = Resources.getResource("jopify.properties");
        final ByteSource byteSource = Resources.asByteSource(url);

        InputStream inputStream = null;
        try {
            inputStream = byteSource.openBufferedStream();
            properties.load(inputStream);
        } catch (final IOException ioException) {
            ioException.printStackTrace();
        } finally {
            if (inputStream != null) {
                try {
                    inputStream.close();
                } catch (final IOException ioException) {
                    ioException.printStackTrace();
                }
            }
        }

        return properties;
    }

    private static String getClientIdFromProperties(Properties properties) {
        String clientId = properties.getProperty("jopify.client_id");

        checkArgument(!isNullOrEmpty(clientId), "Client ID is not set in properties file");

        return clientId;
    }

    private static String getClientSecretFromProperties(Properties properties) {
        String clientSecret = properties.getProperty("jopify.client_secret");

        checkArgument(!isNullOrEmpty(clientSecret), "Client secret is not set in properties file");

        return properties.getProperty("jopify.client_secret");
    }

    private static class ShopifyOAuth2RequestAuthenticator implements OAuth2RequestAuthenticator {

        @Override
        public void authenticate(OAuth2ProtectedResourceDetails resource, OAuth2ClientContext clientContext,
                ClientHttpRequest request) {
            OAuth2AccessToken accessToken = clientContext.getAccessToken();
            if (accessToken == null) {
                throw new AccessTokenRequiredException(resource);
            }

            request.getHeaders().set("X-Shopify-Access-Token", accessToken.getValue());
        }

    }
}