it.bz.tis.integreen.carsharingbzit.api.ApiClient.java Source code

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Here is the source code for it.bz.tis.integreen.carsharingbzit.api.ApiClient.java

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/*
carsharing-ds: car sharing datasource for the integreen cloud
    
Copyright (C) 2015 TIS Innovation Park - Bolzano/Bozen - Italy
    
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU Affero General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
    
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU Affero General Public License for more details.
    
You should have received a copy of the GNU Affero General Public License
along with this program.  If not, see <http://www.gnu.org/licenses/>.
*/

package it.bz.tis.integreen.carsharingbzit.api;

import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.io.StringReader;
import java.io.StringWriter;
import java.net.URL;
import javax.net.ssl.HttpsURLConnection;
import org.apache.logging.log4j.LogManager;
import org.apache.logging.log4j.Logger;
import com.fasterxml.jackson.annotation.JsonAutoDetect.Visibility;
import com.fasterxml.jackson.annotation.PropertyAccessor;
import com.fasterxml.jackson.databind.DeserializationFeature;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.fasterxml.jackson.databind.SerializationFeature;

/**
 * 
 * @author Davide Montesin <d@vide.bz>
 */
public class ApiClient {
    static final Logger logger = LogManager.getLogger(ApiClient.class);

    String endpoint;
    String user;
    String password;

    public ApiClient(String endpoint, String user, String password) {
        this.endpoint = endpoint;
        this.user = user;
        this.password = password;
    }

    public <T> T callWebService(ServiceRequest request, Class<T> clazz) throws IOException {

        request.request.technicalUser.username = this.user;
        request.request.technicalUser.password = this.password;

        ObjectMapper mapper = new ObjectMapper();
        mapper.setVisibility(PropertyAccessor.FIELD, Visibility.NONE)
                .setVisibility(PropertyAccessor.IS_GETTER, Visibility.PUBLIC_ONLY)
                .setVisibility(PropertyAccessor.GETTER, Visibility.PUBLIC_ONLY)
                .setVisibility(PropertyAccessor.SETTER, Visibility.PUBLIC_ONLY);
        mapper.enable(SerializationFeature.INDENT_OUTPUT);

        StringWriter sw = new StringWriter();
        mapper.writeValue(sw, request);

        String requestJson = sw.getBuffer().toString();

        logger.debug("callWebService(): jsonRequest:" + requestJson);

        URL url = new URL(this.endpoint);
        HttpsURLConnection conn = (HttpsURLConnection) url.openConnection();
        conn.setRequestMethod("POST");
        conn.setDoOutput(true);
        OutputStream out = conn.getOutputStream();
        out.write(requestJson.getBytes("UTF-8"));
        out.flush();
        int responseCode = conn.getResponseCode();

        InputStream input = conn.getInputStream();

        ByteArrayOutputStream data = new ByteArrayOutputStream();
        int len;
        byte[] buf = new byte[50000];
        while ((len = input.read(buf)) > 0) {
            data.write(buf, 0, len);
        }
        conn.disconnect();
        String jsonResponse = new String(data.toByteArray(), "UTF-8");

        if (responseCode != 200) {
            throw new IOException(jsonResponse);
        }

        logger.debug("callWebService(): jsonResponse:" + jsonResponse);

        mapper.configure(DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES, false);
        T response = mapper.readValue(new StringReader(jsonResponse), clazz);

        mapper.configure(SerializationFeature.FAIL_ON_EMPTY_BEANS, false);
        sw = new StringWriter();
        mapper.writeValue(sw, response);
        logger.debug(
                "callWebService(): parsed response into " + response.getClass().getName() + ":" + sw.toString());

        return response;
    }
}