com.web.mavenproject6.controller.VKController.java Source code

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Here is the source code for com.web.mavenproject6.controller.VKController.java

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package com.web.mavenproject6.controller;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.apache.http.HttpResponse;
import org.apache.http.client.HttpClient;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.impl.client.DefaultHttpClient;
import org.json.JSONException;
import org.json.JSONObject;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.context.annotation.PropertySource;
import org.springframework.stereotype.Controller;
import org.springframework.ui.ModelMap;
import org.springframework.util.StringUtils;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RequestParam;

/**
 *
 * @author Aleks
 */
@Controller
@PropertySource("resources/application.properties")
public class VKController {

    @Value("${vkapi.connection.url}")
    private String connectonUrl;
    @Value("${vkapi.api.url}")
    private String apiUrl;
    @Value("${vkapi.connection.url.accessToken}")
    private String accessTokenUrl;
    @Value("${vkapi.id}")
    private String clientId;
    @Value("${vkapi.secret}")
    private String apiSecret;
    @Value("${vkapi.redirect}")
    private String redirectUrl;

    private String accessToken;

    private class Param {

        private String name;
        private String value;

        public Param() {
            this.name = "";
            this.value = "";
        }

        public String getName() {
            return name;
        }

        public void setName(String name) {
            this.name = name;
        }

        public String getValue() {
            return value;
        }

        public void setValue(String value) {
            this.value = value;
        }

    }

    @RequestMapping(value = "/vk_connection_url")
    public void vkConnectionUrl(HttpServletResponse response) throws IOException {
        response.sendRedirect(connectonUrl);
    }

    @RequestMapping(value = "/vk_callback", method = RequestMethod.GET)
    public void vkCallback(@RequestParam("code") String code, HttpServletRequest r, HttpServletResponse response,
            ModelMap model) throws IOException, JSONException {

        HttpClient client = new DefaultHttpClient();
        HttpGet method = new HttpGet(accessTokenUrl.concat("client_id=").concat(clientId).concat("&client_secret=")
                .concat(apiSecret).concat("&code=").concat(code).concat("&redirect_uri=").concat(redirectUrl));

        HttpResponse resp = client.execute(method);
        BufferedReader reader = new BufferedReader(new InputStreamReader(resp.getEntity().getContent()));
        JSONObject json = new JSONObject(reader.readLine());
        accessToken = json.get("access_token").toString();
        reader.close();
    }

    private JSONObject execute(String apiMethod, Param... params) throws IOException, JSONException {
        if (accessToken != null || StringUtils.isEmpty(accessToken)) {
            return new JSONObject();
        }

        String paramString = "?".concat(accessToken);
        if (params != null) {
            for (Param p : params) {
                paramString = paramString.concat("&").concat(p.getName()).concat("=").concat(p.getValue());
            }
        }

        HttpClient client = new DefaultHttpClient();
        HttpGet method = new HttpGet(apiUrl.concat(apiMethod).concat(paramString));

        HttpResponse resp = client.execute(method);
        BufferedReader reader = new BufferedReader(new InputStreamReader(resp.getEntity().getContent()));
        JSONObject json = new JSONObject(reader.readLine());
        reader.close();
        return json;
    }

}