/*

 * Copyright (c) 1994, 1998, Oracle and/or its affiliates. All rights reserved.

 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

 *

 * This code is free software; you can redistribute it and/or modify it

 * under the terms of the GNU General Public License version 2 only, as

 * published by the Free Software Foundation.  Oracle designates this

 * particular file as subject to the "Classpath" exception as provided

 * by Oracle in the LICENSE file that accompanied this code.

 *

 * This code 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

 * version 2 for more details (a copy is included in the LICENSE file that

 * accompanied this code).

 *

 * You should have received a copy of the GNU General Public License version

 * 2 along with this work; if not, write to the Free Software Foundation,

 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

 *

 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

 * or visit www.oracle.com if you need additional information or have any

 * questions.

 */

package sun.net.www;

import java.net.URL;

import java.io.*;

import java.util.StringTokenizer;

class MimeLauncher extends Thread {

    java.net.URLConnection uc;

    MimeEntry m;

    String genericTempFileTemplate;

    InputStream is;

    String execPath;

    MimeLauncher (MimeEntry M, java.net.URLConnection uc,

                  InputStream is, String tempFileTemplate, String threadName) throws ApplicationLaunchException {

        super(null, null, threadName, 0, false);

        m = M;

        this.uc = uc;

        this.is = is;

        genericTempFileTemplate = tempFileTemplate;

        /* get the application to launch */

        String launchString = m.getLaunchString();

        /* get a valid path to launch application - sets

           the execPath instance variable with the correct path.

         */

        if (!findExecutablePath(launchString)) {

            /* strip off parameters i.e %s */

            String appName;

            int index = launchString.indexOf(' ');

            if (index != -1) {

                appName = launchString.substring(0, index);

            }

            else {

                appName = launchString;

            }

            throw new ApplicationLaunchException(appName);

        }

    }

    protected String getTempFileName(URL url, String template) {

        String tempFilename = template;

        // Replace all but last occurrance of "%s" with timestamp to insure

        // uniqueness.  There's a subtle behavior here: if there is anything

        // _after_ the last "%s" we need to append it so that unusual launch

        // strings that have the datafile in the middle can still be used.

        int wildcard = tempFilename.lastIndexOf("%s");

        String prefix = tempFilename.substring(0, wildcard);

        String suffix = "";

        if (wildcard < tempFilename.length() - 2) {

            suffix = tempFilename.substring(wildcard + 2);

        }

        long timestamp = System.currentTimeMillis()/1000;

        int argIndex = 0;

        while ((argIndex = prefix.indexOf("%s")) >= 0) {

            prefix = prefix.substring(0, argIndex)

                + timestamp

                + prefix.substring(argIndex + 2);

        }

        // Add a file name and file-extension if known

        String filename = url.getFile();

        String extension = "";

        int dot = filename.lastIndexOf('.');

        // BugId 4084826:  Temp MIME file names not always valid.

        // Fix:  don't allow slashes in the file name or extension.

        if (dot >= 0 && dot > filename.lastIndexOf('/')) {

            extension = filename.substring(dot);

        }

        filename = "HJ" + url.hashCode();

        tempFilename = prefix + filename + timestamp + extension + suffix;

        return tempFilename;

    }

    public void run() {

        try {

            String ofn = m.getTempFileTemplate();

            if (ofn == null) {

                ofn = genericTempFileTemplate;

            }

            ofn = getTempFileName(uc.getURL(), ofn);

            try {

                OutputStream os = new FileOutputStream(ofn);

                byte buf[] = new byte[2048];

                int i = 0;

                try {

                    while ((i = is.read(buf)) >= 0) {

                        os.write(buf, 0, i);

                    }

                } catch(IOException e) {

                  //System.err.println("Exception in write loop " + i);

                  //e.printStackTrace();

                } finally {

                    os.close();

                    is.close();

                }

            } catch(IOException e) {

              //System.err.println("Exception in input or output stream");

              //e.printStackTrace();

            }

            int inx = 0;

            String c = execPath;

            while ((inx = c.indexOf("%t")) >= 0) {

                c = c.substring(0, inx) + uc.getContentType()

                    + c.substring(inx + 2);

            }

            boolean substituted = false;

            while ((inx = c.indexOf("%s")) >= 0) {

                c = c.substring(0, inx) + ofn + c.substring(inx + 2);

                substituted = true;

            }

            if (!substituted)

                c = c + " <" + ofn;

            // System.out.println("Execing " +c);

            Runtime.getRuntime().exec(c);

        } catch(IOException e) {

        }

    }

    /* This method determines the path for the launcher application

       and sets the execPath instance variable.  It uses the exec.path

       property to obtain a list of paths that is in turn used to

       location the application.  If a valid path is not found, it

       returns false else true.  */

    private boolean findExecutablePath(String str) {

        if (str == null || str.length() == 0) {

            return false;

        }

        String command;

        int index = str.indexOf(' ');

        if (index != -1) {

            command = str.substring(0, index);

        }

        else {

            command = str;

        }

        File f = new File(command);

        if (f.isFile()) {

            // Already executable as it is

            execPath = str;

            return true;

        }

        String execPathList;

        if (execPathList == null) {

            // exec.path property not set

            return false;

        }

        StringTokenizer iter = new StringTokenizer(execPathList, "|");

        while (iter.hasMoreElements()) {

            String prefix = (String)iter.nextElement();

            String fullCmd = prefix + File.separator + command;

            f = new File(fullCmd);

            if (f.isFile()) {

                execPath = prefix + File.separator + str;

                return true;

            }

        }

        return false; // application not found in exec.path

    }

}