Home.java

package code;

import java.io.BufferedReader;
import java.io.FileNotFoundException;
import java.io.FileReader;
import java.io.IOException;
import java.io.OutputStream;
import java.net.URI;
import java.util.ArrayList;
import java.util.List;

import org.json.JSONException;
import org.json.JSONObject;

import com.sun.net.httpserver.HttpExchange;
import com.sun.net.httpserver.HttpHandler;

public class Home implements HttpHandler {

    @Override
    public void handle(HttpExchange exchange) throws IOException {
        URI requestURI = exchange.getRequestURI();
        boolean wantsHome = Helper.compareText(requestURI.toString(),URI.create("/").toString());
        boolean wantsKeycloak = Helper.compareText(requestURI.toString(),URI.create("/keycloak.json").toString());
        if(!wantsHome && !wantsKeycloak) {
            String error = "Invalid URI";
            OutputStream os = exchange.getResponseBody();
            exchange.sendResponseHeaders(400, error.getBytes().length);
            os.write(error.getBytes());
            os.close();
            return;
        }

        String requestMethod = exchange.getRequestMethod();
        if (Helper.compareText(requestMethod, "GET")) {
            List<String> strlist = new ArrayList<>();
            String response = null;
            if(wantsHome){
                response = getHomePage();
                strlist.add("text/html");
            } else if (wantsKeycloak){
                response = getKeycloak();
                strlist.add("text/json");
            }
            if(response != null && !Helper.compareText(response, "fail")){
                exchange.getResponseHeaders().put("content-type", strlist);
                exchange.sendResponseHeaders(200, response.getBytes().length);
                OutputStream os = exchange.getResponseBody();
                os.write(response.getBytes());
                os.close();
            } else {
                exchange.sendResponseHeaders(500, response.getBytes().length);
                OutputStream os = exchange.getResponseBody();
                os.write(response.getBytes());
                os.close();
            }
        } else {
            Helper.methodNotAllowed(exchange);
        }
    }

    private static String getHomePage() {
        String line;
//        String pageIDString = pageid.toString();
        String page = Server.CLIENT_PATH+"/index.html";// + pageIDString.substring(0, pageIDString.length() - 1) + ".txt";// entro nella cartella
        // html e leggo il file
        // txt

        StringBuilder answer = new StringBuilder();
        if (getExtension(page).length() == 0)
            page += ".html";

        BufferedReader bufferedReader = null;
        try {
            FileReader fileReader = new FileReader(page);

            bufferedReader = new BufferedReader(fileReader);
            boolean isComment = false;
            while ((line = bufferedReader.readLine()) != null) {
            	line = line.trim();

            	if(line.startsWith("<!--") && line.endsWith("-->")) {
            		continue;
            	}
            	if(line.startsWith("<!--")) {
            		isComment = true;
            		continue;
            	}
            	if(line.endsWith("-->")) {
            		isComment = false;
            		continue;
            	}

            	if(!isComment && line.length()>0)
                	answer.append(line).append("\n");
            }
        } catch (FileNotFoundException ex) {
            System.out.println("Unable to open file '" + page + "'");
            return "fail";
        } catch (IOException ex) {
            System.out.println("Error reading file '" + page + "'");
            return "fail";
        } finally {
            try{
                if(bufferedReader != null)
                    bufferedReader.close();
            } catch (IOException ex){
                System.out.println("Error closing bufferedReader");
            }
        }
        return answer.toString();
    }

    private static String getKeycloak(){
        String page = Server.CLIENT_PATH+"/keycloak.json";
        BufferedReader bufferedReader = null;
        StringBuilder answer = new StringBuilder();
        try {
            FileReader fileReader = new FileReader(page);
            bufferedReader = new BufferedReader(fileReader);
            String line;
            while ((line = bufferedReader.readLine()) != null) {
                answer.append(line.trim());
            }

            JSONObject js = new JSONObject(answer.toString());
            return js.toString();
        } catch (FileNotFoundException ex) {
            System.out.println("Unable to open file '" + page + "'");
            return "fail";
        } catch (IOException ex) {
            System.out.println("Error reading file '" + page + "'");
            return "fail";
        } catch (JSONException e) {
            System.out.println("The file doesn't contain a JSON '" + page + "'");
            return "fail";
        } finally {
            try{
                if(bufferedReader != null)
                    bufferedReader.close();
            } catch (IOException ex){
                System.out.println("Error closing bufferedReader");
            }
        }
    }

    private static String getExtension(String file) {
        int i = file.length() - 1;
        while (i > 0 && file.charAt(i) != '.' && file.charAt(i) != '/')
            i--;
        if (file.charAt(i) == '.')
            return file.substring(i + 1);
        else
            return "";
    }

}