FacePlusPlusUtils.java

/*******************************************************************************
 * Copyright (C) 2020 Ram Sadasiv
 * 
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU 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 General Public License for more details.
 * 
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 ******************************************************************************/
package io.outofprintmagazine.nlp.utils;

import java.io.IOException;
import java.net.URISyntaxException;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

import org.apache.http.NameValuePair;
import org.apache.http.client.entity.UrlEncodedFormEntity;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.message.BasicNameValuePair;
import org.apache.logging.log4j.LogManager;
import org.apache.logging.log4j.Logger;

import com.fasterxml.jackson.databind.JsonNode;

import io.outofprintmagazine.util.IParameterStore;
/**
 * <p>You will need to set faceplusplus_apiKey and faceplusplus_secret in your IParameterStore.</p>
 * <p>Visit: <a href="https://www.faceplusplus.com/face-detection/">Faceplusplus</a> to sign up.</p> 
 * @author Ram Sadasiv
 */
public class FacePlusPlusUtils {
	
	private static final Logger logger = LogManager.getLogger(FacePlusPlusUtils.class);
	
	@SuppressWarnings("unused")
	private Logger getLogger() {
		return logger;
	}
	
	private IParameterStore parameterStore = null;

	private FacePlusPlusUtils(IParameterStore parameterStore) throws IOException {
		this.parameterStore = parameterStore;
	}
	
	private static Map<IParameterStore, FacePlusPlusUtils> instances = new HashMap<IParameterStore, FacePlusPlusUtils>();
	
    public static FacePlusPlusUtils getInstance(IParameterStore parameterStore) throws IOException { 
        if (instances.get(parameterStore) == null) {
        	FacePlusPlusUtils instance = new FacePlusPlusUtils(parameterStore);
            instances.put(parameterStore, instance);
        }
        return instances.get(parameterStore); 
    }
    
    public JsonNode imageHasOneFace(String imageUrl) throws IOException, URISyntaxException {
        HttpPost http = new HttpPost("https://api-us.faceplusplus.com/facepp/v3/detect");
        List<NameValuePair> nvps = new ArrayList<NameValuePair>();
        nvps.add(new BasicNameValuePair("api_key", parameterStore.getProperty("faceplusplus_apiKey")));
        nvps.add(new BasicNameValuePair("api_secret", parameterStore.getProperty("faceplusplus_secret")));
        nvps.add(new BasicNameValuePair("image_url", imageUrl));
        http.setEntity(new UrlEncodedFormEntity(nvps));

    	JsonNode doc = HttpUtils.getInstance(parameterStore).httpPostJson(http);
    	if (doc.get("face_num").asInt() == 1) {
    		return doc.get("faces").get(0).get("face_rectangle");
    	}
    	else {
    		return null;
    	}
    }      
}