source: greenstone3/trunk/src/java/org/greenstone/server/BrowserLauncher.java@ 20918

package org.greenstone.server;

import java.io.BufferedReader;
import java.io.InputStream;
import java.io.InputStreamReader;

import org.greenstone.gsdl3.util.Misc;
import org.apache.log4j.*;

public class BrowserLauncher 
    extends Thread {
    private String url = "about:blank" ;
    static Logger logger = Logger.getLogger(org.greenstone.server.BrowserLauncher.class.getName());
    private String[] default_browsers = new String[]{"firefox","mozilla"};
    private String command = "";
    private int state = -1; //0: launch success, 1: launch failed 
    public final  static int LAUNCHSUCCESS = 0;
    public final static int LAUNCHFAILED = 1;
    private String browserPath = ""; 

    public BrowserLauncher(String browserPath, String url) {
    this.url = url;
        this.browserPath = browserPath;
        //use the default browser
    if (this.browserPath.equals("")){
        setBrowserCommand();
    }
    else{
        this.command = this.browserPath + " " + this.url;
    }
    }

    public BrowserLauncher(){

    }

    // we should try and use settings from the settings panel??
    protected void setBrowserCommand() {
    if(Misc.isWindows()) {
        // we use cmd and start
        if (Misc.isWindows9x()) {
        this.command = BaseServer.Property.WIN_9X_OPEN_COMMAND;//"command.com /c start \""+url+"\"";
        } else {
        this.command = BaseServer.Property.WIN_OPEN_COMMAND;//"cmd.exe /c start \"\" \""+url+"\"";
        }
    } else if (Misc.isMac()) {
        this.command = BaseServer.Property.MAC_OPEN_COMMAND; // "open %1"
    } else {
         // we try to look for a browser
        for (int i=0; i<default_browsers.length; i++) {
        if (isAvailable(default_browsers[i])) {
            this.command = default_browsers[i] + " %1";
            break;
        }
        }
    }

    this.command = this.command.replaceAll("%1",this.url);
    }

    protected boolean isAvailable(String program) {
    try {
             Runtime run = Runtime.getRuntime();
             Process process = run.exec("which "+ program);
             BufferedReader br = new BufferedReader(new InputStreamReader(process.getInputStream()));
         String line = null;
         while ((line = br.readLine()) != null){
         if (line.indexOf("no "+program) !=-1){
             return false;
         }
         }      
         
        return true;
    } catch (Exception e) {
        return false;
    }
    }

    public  int getBrowserState(){
    return state;
    }
    
    public void run() {
    // Call an external process using the args.
    if(command.equals("")) {
        state = LAUNCHFAILED;
            logger.error("launching command is empty: no browser found.");
        return;
    }
    
        try {
        int exitCode = 0;
        String prog_name = this.command.substring(0,this.command.indexOf(" "));
        String lower_name = prog_name.toLowerCase();
        if (lower_name.indexOf("mozilla") != -1 || lower_name.indexOf("firefox") != -1) { 
        logger.info("found mozilla or firefox, trying to remotely launch it");
                // mozilla and netscape, try using a remote command to get things in the same window
        String new_command = prog_name +" -raise -remote openURL("+url+",new-tab)";
        logger.info(new_command);
        Runtime rt = Runtime.getRuntime();
        Process process = rt.exec(new_command);
                state = LAUNCHSUCCESS;
        exitCode = process.waitFor();
        logger.info("ExitCode:" + exitCode);              
        if (exitCode != 0) { // if Netscape or mozilla was not open
            logger.info("couldn't do remote, trying original command");
                    logger.info(this.command);
            process = rt.exec(this.command); // try the original command
                    state = LAUNCHSUCCESS;
            //for some reason the following part is not executed sometimes.
                    exitCode = process.waitFor();
        }
        } else {
        logger.info(this.command);
                Runtime rt = Runtime.getRuntime();
        Process process = rt.exec(this.command);
                state = LAUNCHSUCCESS;
                //for some reason the following part is not executed sometimes.
                exitCode = process.waitFor();
        }

        logger.info("ExitCode:" + exitCode);
        if (exitCode != 0) { // if trying to launch the browser above failed
           state = LAUNCHFAILED;
           logger.error("Failed to launch web browser when running command:");
           logger.error("\t" + this.command);       
        }
    }
    catch (Exception e) {
        logger.error(e);
            state = LAUNCHFAILED;
    }
    
    }
}