Adds some integration with firefox.

This is still rather unstable, but it runs.

interface/src/main/java/edu/regis/universe_player/Player.java

@@ -0,0 +1,75 @@
+/*
+ * Copyright (c) 2021 William Hubbard. All Rights Reserved.
+ */
+
+package edu.regis.universe_player;
+
+import edu.regis.universe_player.data.Song;
+
+/**
+ * This interface serves as the connection to a music player of some sort, whether it be
+ * browser-based or from a file.
+ *
+ * @param <T> - The type of songs supported.
+ * @author William Hubbard
+ * @since 0.1
+ */
+public interface Player<T extends Song>
+{
+    /**
+     * Obtains the song currently playing.
+     *
+     * @return The current song, or null if none is playing.
+     */
+    Song getCurrentSong();
+
+    /**
+     * Loads up a song
+     *
+     * @param song - The song to load.
+     */
+    void play(T song);
+
+    /**
+     * Enables playback of the current song, if one is active.
+     */
+    void play();
+
+    /**
+     * Pauses playback of the current song.
+     */
+    void pause();
+
+    /**
+     * Toggles between playing and pausing the current song.
+     */
+    void togglePlayback();
+
+    /**
+     * Sets the current song time to the specified position.
+     *
+     * @param time - The specified time in the song, in seconds.
+     */
+    void seek(float time);
+
+    /**
+     * Checks to see if the song is paused.
+     *
+     * @return Whether or not the song is paused.
+     */
+    boolean isPaused();
+
+    /**
+     * Obtains the time we are currently at in the current song.
+     *
+     * @return - The current song position in seconds, or -1 if no song is playing.
+     */
+    float getCurrentTime();
+
+    /**
+     * Gets the length of the current song.
+     *
+     * @return The song length, in seconds.
+     */
+    float getLength();
+}

interface/src/main/java/edu/regis/universe_player/browser/Browser.java

@@ -0,0 +1,146 @@
+/*
+ * Copyright (c) 2021 William Hubbard. All Rights Reserved.
+ */
+
+package edu.regis.universe_player.browser;
+
+import com.google.gson.Gson;
+import com.google.gson.stream.JsonWriter;
+
+import java.io.File;
+import java.io.FileWriter;
+import java.io.IOException;
+import java.net.URL;
+
+/**
+ * This serves as a central point for controlling the browser process.
+ *
+ * @author William Hubbard
+ * @since 0.1
+ */
+public class Browser
+{
+    private static Process process;
+
+    /**
+     * Utility method for launching a browser instance
+     *
+     * @throws IOException
+     */
+    public static void launchBrowser() throws IOException
+    {
+        String os = System.getProperty("os.name").toLowerCase();
+        String arch = System.getProperty("os.arch").toLowerCase();
+        String args = " -profile browser/profile";
+        if (process != null && process.isAlive())
+        {
+            process.destroy();
+        }
+
+        if (os.contains("windows"))
+        {
+            setupWindows();
+            process = Runtime.getRuntime().exec("browser/windows/FirefoxPortable.exe" + args);
+        }
+        else if (os.contains("linux"))
+        {
+            setupLinux();
+            if (arch.contains("64"))
+            {
+                process = Runtime.getRuntime().exec("./browser/linux64/firefox" + args);
+            }
+            else
+            {
+                process = Runtime.getRuntime().exec("./browser/linux32/firefox" + args);
+            }
+        }
+
+        System.out.println(os);
+    }
+
+    /**
+     * Performs first-time setup for Windows applications.
+     */
+    private static void setupWindows()
+    {
+        try
+        {
+            Runtime.getRuntime()
+                   .exec("REG ADD HKEY_CURRENT_USER\\SOFTWARE\\Mozilla\\NativeMessagingHosts /v universal_music /d \"" + System
+                           .getProperty("user.dir") + "\\bin\\interface.bat\" ");
+        }
+        catch (IOException e)
+        {
+            System.err.println("Could not set Windows registry key.");
+            e.printStackTrace();
+        }
+    }
+
+    /**
+     * Performs first-time setup for OSX applications.
+     */
+    private static void setupMac()
+    {
+        Gson gson = new Gson();
+        try (JsonWriter writer = gson.newJsonWriter(new FileWriter(new File(System
+                .getProperty("user.home"), "Library/Application Support/Mozilla/NativeMessagingHosts/universal_music.json"))))
+        {
+            writeManifest(writer, System.getProperty("user.dir") + "/bin/interface");
+        }
+        catch (IOException e)
+        {
+            System.err.println("Could not set Mac application manifest.");
+            e.printStackTrace();
+        }
+    }
+
+    /**
+     * Performs first-time setup for Linux applications.
+     */
+    private static void setupLinux()
+    {
+        Gson gson = new Gson();
+        try (JsonWriter writer = gson.newJsonWriter(new FileWriter(new File(System
+                .getProperty("user.home"), ".mozilla/native-messaging-hosts/universal_music.json"))))
+        {
+            writeManifest(writer, System.getProperty("user.dir") + "/bin/interface");
+        }
+        catch (IOException e)
+        {
+            System.err.println("Could not set Linux application manifest.");
+            e.printStackTrace();
+        }
+    }
+
+    private static void writeManifest(JsonWriter writer, String path) throws IOException
+    {
+        writer.beginObject();
+
+        writer.name("name");
+        writer.value("universal_music");
+        writer.name("description");
+        writer.value("Universal Music Player");
+        writer.name("path");
+        writer.value(path);
+        writer.name("type");
+        writer.value("stdio");
+
+        writer.name("allowed_extensions");
+        writer.beginArray();
+        writer.value("universal_music@regis.edu");
+        writer.endArray();
+
+        writer.endObject();
+    }
+
+    /**
+     * Tells the browser process to shut down.
+     */
+    public static void closeBrowser()
+    {
+        if (process != null && process.isAlive())
+        {
+            process.destroy();
+        }
+    }
+}

interface/src/main/java/edu/regis/universe_player/browser/MessageManager.java

@@ -0,0 +1,121 @@
+/*
+ * Copyright (c) 2021 William Hubbard. All Rights Reserved.
+ */
+
+package edu.regis.universe_player.browser;
+
+import com.google.gson.Gson;
+import com.google.gson.stream.JsonReader;
+import com.google.gson.stream.JsonToken;
+import com.google.gson.stream.JsonWriter;
+
+import java.io.BufferedInputStream;
+import java.io.BufferedReader;
+import java.io.Closeable;
+import java.io.IOException;
+import java.io.InputStreamReader;
+import java.io.OutputStreamWriter;
+import java.io.PrintStream;
+import java.io.Reader;
+import java.util.Scanner;
+
+/**
+ * This class will send messages to the
+ */
+public class MessageManager implements Closeable
+{
+    private final JsonReader in;
+    private final JsonWriter out;
+    private final Gson gson;
+
+    public MessageManager() throws IOException
+    {
+        this.gson = new Gson();
+        this.in = this.gson.newJsonReader(new InputStreamReader(System.in));
+        this.out = this.gson.newJsonWriter(new OutputStreamWriter(System.out));
+    }
+
+    /**
+     * Retrieves an object from the browser.
+     *
+     * @return - A parsed object. What it is depends on the browser.
+     */
+    public Object getMessage() throws IOException
+    {
+        Object value = null;
+        this.in.beginObject();
+        while (this.in.hasNext())
+        {
+            switch (this.in.nextName())
+            {
+            case "response":
+                switch (this.in.peek())
+                {
+                case STRING:
+                    value = this.in.nextString();
+                    break;
+                case NUMBER:
+                    value = this.in.nextDouble();
+                    break;
+                case BOOLEAN:
+                    value = this.in.nextBoolean();
+                    break;
+                case NULL:
+                    this.in.nextNull();
+                    break;
+                default:
+                    throw new IOException("Unexpected JSON type" + this.in.peek());
+                }
+                break;
+            }
+        }
+        this.in.endObject();
+
+        return value;
+    }
+
+    /**
+     * Sends a string message to the browser.
+     *
+     * @param message - The message to send.
+     */
+    public void writeMessage(String message)
+    {
+        String value = null;
+        String type = null;
+        try
+        {
+            this.out.beginObject();
+            this.out.name("message");
+            this.out.value(message);
+            this.out.endObject();
+        }
+        catch (IOException e)
+        {
+        }
+    }
+
+    /**
+     * Pings the browser.
+     */
+    public void ping()
+    {
+        try
+        {
+            this.out.beginObject();
+            this.out.name("command");
+            this.out.value("ping");
+            this.out.endObject();
+        }
+        catch (IOException e)
+        {
+        }
+    }
+
+    @Override
+    public void close() throws IOException
+    {
+        this.in.close();
+        this.out.close();
+    }
+}

interface/src/main/java/edu/regis/universe_player/player/Interface.java

@@ -8,11 +8,17 @@ import java.awt.BorderLayout;
 import java.awt.Dimension;
 import java.awt.event.ComponentEvent;
 import java.awt.event.ComponentListener;
+import java.awt.event.WindowEvent;
+import java.awt.event.WindowListener;
+import java.io.IOException;
 import java.util.Collection;
 
 import javax.swing.JFrame;
+import javax.swing.JOptionPane;
 import javax.swing.JScrollPane;
 
+import edu.regis.universe_player.browser.Browser;
+import edu.regis.universe_player.browser.MessageManager;
 import edu.regis.universe_player.data.CollectionType;
 import edu.regis.universe_player.data.Song;
 
@@ -22,7 +28,7 @@ import edu.regis.universe_player.data.Song;
  * @author William Hubbard
  * @version 0.1
  */
-public class Interface extends JFrame implements SongDisplayListener, ComponentListener
+public class Interface extends JFrame implements SongDisplayListener, ComponentListener, WindowListener, PlaybackCommandListener
 {
     /**
      * A reference to the panel containing links to different collection views.
@@ -41,9 +47,32 @@ public class Interface extends JFrame implements SongDisplayListener, ComponentL
      */
     private JScrollPane centerView;
 
+    /**
+     * A link to the browser.
+     */
+    private MessageManager browser;
+
     public static void main(String[] args)
     {
+        try
+        {
+            Browser.launchBrowser();
+        }
+        catch (IOException e)
+        {
+            e.printStackTrace();
+            JOptionPane.showMessageDialog(null, e, "Could not open browser background", JOptionPane.ERROR_MESSAGE);
+        }
         Interface inter = new Interface();
+        try
+        {
+            inter.browser = new MessageManager();
+        }
+        catch (IOException e)
+        {
+            e.printStackTrace();
+            JOptionPane.showMessageDialog(null, e, "Could not open browser communication", JOptionPane.ERROR_MESSAGE);
+        }
         inter.pack();
         inter.setVisible(true);
     }
@@ -54,12 +83,16 @@ public class Interface extends JFrame implements SongDisplayListener, ComponentL
     public Interface()
     {
         super();
+        PlayerControls controls;
+
         this.setTitle("Universal Music Player");
         this.getContentPane().setLayout(new BorderLayout());
         this.getContentPane()
             .add(this.collectionTypes = new Collections(), BorderLayout.LINE_START);
         this.collectionTypes.addSongDisplayListener(this);
-        this.getContentPane().add(new PlayerControls(), BorderLayout.PAGE_END);
+        controls = new PlayerControls();
+        controls.addCommandListener(this);
+        this.getContentPane().add(controls, BorderLayout.PAGE_END);
 
         this.songList = new SongList();
         this.collectionList = new CollectionList();
@@ -70,6 +103,7 @@ public class Interface extends JFrame implements SongDisplayListener, ComponentL
         this.componentResized(null);
 
         this.addComponentListener(this);
+        this.addWindowListener(this);
 
         this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
     }
@@ -130,4 +164,91 @@ public class Interface extends JFrame implements SongDisplayListener, ComponentL
     {
 
     }
+
+    @Override
+    public void windowOpened(WindowEvent windowEvent)
+    {
+
+    }
+
+    @Override
+    public void windowClosing(WindowEvent windowEvent)
+    {
+        Browser.closeBrowser();
+        if (this.browser != null)
+        {
+            try
+            {
+                this.browser.close();
+            }
+            catch (IOException e)
+            {
+                e.printStackTrace();
+            }
+        }
+    }
+
+    @Override
+    public void windowClosed(WindowEvent windowEvent)
+    {
+    }
+
+    @Override
+    public void windowIconified(WindowEvent windowEvent)
+    {
+
+    }
+
+    @Override
+    public void windowDeiconified(WindowEvent windowEvent)
+    {
+
+    }
+
+    @Override
+    public void windowActivated(WindowEvent windowEvent)
+    {
+
+    }
+
+    @Override
+    public void windowDeactivated(WindowEvent windowEvent)
+    {
+
+    }
+
+    /**
+     * Called when a playback command is issued.
+     *
+     * @param command - The command issued.
+     * @param data    - Additional data relevent to the command.
+     */
+    @Override
+    public void onCommand(PlaybackCommand command, Object data)
+    {
+        Object message = null;
+        if (this.browser != null)
+        {
+            synchronized (this.browser)
+            {
+                try
+                {
+                    this.browser.ping();
+                    message = this.browser.getMessage();
+                }
+                catch (IOException e)
+                {
+                    e.printStackTrace();
+                    JOptionPane.showMessageDialog(this, e, "Could not send message to browser", JOptionPane.ERROR_MESSAGE);
+                }
+            }
+        }
+        if (message != null)
+        {
+            if ("ping".equals(message))
+            {
+                JOptionPane.showMessageDialog(this, "Ping received!");
+            }
+        }
+    }
 }

interface/src/main/java/edu/regis/universe_player/player/PlaybackCommand.java

@@ -0,0 +1,16 @@
+/*
+ * Copyright (c) 2021 William Hubbard. All Rights Reserved.
+ */
+
+package edu.regis.universe_player.player;
+
+/**
+ * Contains possible playback commands that the play can send.
+ *
+ * @author William Hubbard
+ * @version 0.1
+ */
+public enum PlaybackCommand
+{
+    PLAY, PAUSE, NEXT, PREVIOUS, SEEK
+}

interface/src/main/java/edu/regis/universe_player/player/PlaybackCommandListener.java

@@ -0,0 +1,24 @@
+/*
+ * Copyright (c) 2021 William Hubbard. All Rights Reserved.
+ */
+
+package edu.regis.universe_player.player;
+
+import java.util.EventListener;
+
+/**
+ * A listener that allows objects to observe when playback commands are triggered.
+ *
+ * @author William Hubbard
+ * @version 0.1
+ */
+public interface PlaybackCommandListener extends EventListener
+{
+    /**
+     * Called when a playback command is issued.
+     *
+     * @param command - The command issued.
+     * @param data    - Additional data relevent to the command.
+     */
+    void onCommand(PlaybackCommand command, Object data);
+}

interface/src/main/java/edu/regis/universe_player/player/PlayerControls.java

@@ -6,6 +6,7 @@ package edu.regis.universe_player.player;
 
 import java.awt.Dimension;
 import java.awt.FlowLayout;
+import java.util.LinkedList;
 
 import javax.swing.ImageIcon;
 import javax.swing.JButton;
@@ -26,12 +27,16 @@ public class PlayerControls extends JPanel
     private JButton prevButton;
     private JSlider progress;
 
+    /**
+     * A list of all things interested in knowing when we trigger a command.
+     */
+    private LinkedList<PlaybackCommandListener> listeners = new LinkedList<>();
+
     public PlayerControls()
     {
         final Dimension BUTTON_SIZE = new Dimension(32, 32);
         final Dimension ICON_SIZE = new Dimension(16, 16);
         ImageIcon icon;
-        JButton button;
         JPanel buttonCont, progressCont;
         FlowLayout buttonLayout;
         SpringLayout progressLayout;
@@ -43,36 +48,45 @@ public class PlayerControls extends JPanel
         buttonCont = new JPanel(buttonLayout);
         this.add(buttonCont);
 
-        button = new JButton();
+        this.prevButton = new JButton();
         icon = new ImageIcon(this.getClass()
                                  .getResource("/gui/icons/skipPrev.png"), "Previous Button");
         icon.setImage(icon.getImage().getScaledInstance(ICON_SIZE.width, ICON_SIZE.height, 0));
-        button.setIcon(icon);
-        button.setPreferredSize(BUTTON_SIZE);
-        buttonCont.add(button);
-        this.prevButton = button;
+        this.prevButton.setIcon(icon);
+        this.prevButton.setPreferredSize(BUTTON_SIZE);
+        this.prevButton.addActionListener(actionEvent -> {
+            this.triggerCommandListeners(PlaybackCommand.PREVIOUS, null);
+        });
+        buttonCont.add(this.prevButton);
 
-        button = new JButton();
+        this.playButton = new JButton();
         icon = new ImageIcon(this.getClass().getResource("/gui/icons/play.png"), "Play Button");
         icon.setImage(icon.getImage().getScaledInstance(ICON_SIZE.width, ICON_SIZE.height, 0));
-        button.setIcon(icon);
-        button.setPreferredSize(BUTTON_SIZE);
-        buttonCont.add(button);
-        this.playButton = button;
+        this.playButton.setIcon(icon);
+        this.playButton.setPreferredSize(BUTTON_SIZE);
+        this.playButton.addActionListener(actionEvent -> {
+            this.triggerCommandListeners(PlaybackCommand.PLAY, null);
+        });
+        buttonCont.add(this.playButton);
 
-        button = new JButton();
+        this.nextButton = new JButton();
         icon = new ImageIcon(this.getClass().getResource("/gui/icons/skipNext.png"), "Next Button");
         icon.setImage(icon.getImage().getScaledInstance(ICON_SIZE.width, ICON_SIZE.height, 0));
-        button.setIcon(icon);
-        button.setPreferredSize(BUTTON_SIZE);
-        buttonCont.add(button);
-        this.nextButton = button;
+        this.nextButton.setIcon(icon);
+        this.nextButton.setPreferredSize(BUTTON_SIZE);
+        this.nextButton.addActionListener(actionEvent -> {
+            this.triggerCommandListeners(PlaybackCommand.NEXT, null);
+        });
+        buttonCont.add(this.nextButton);
 
         progressLayout = new SpringLayout();
         progressCont = new JPanel(progressLayout);
         this.add(progressCont);
 
         this.progress = new JSlider();
+        this.progress.addChangeListener(changeEvent -> {
+            this.triggerCommandListeners(PlaybackCommand.SEEK, this.progress.getValue());
+        });
         this.add(this.progress);
 
         layout.putConstraint(SpringLayout.NORTH, buttonCont, 0, SpringLayout.NORTH, this);
@@ -83,4 +97,38 @@ public class PlayerControls extends JPanel
         layout.putConstraint(SpringLayout.SOUTH, this, 5, SpringLayout.SOUTH, this.progress);
         layout.putConstraint(SpringLayout.EAST, buttonCont, 0, SpringLayout.EAST, this);
     }
+
+    /**
+     * Adds a listener for playback commands.
+     *
+     * @param listener - The listener to add.
+     */
+    public void addCommandListener(PlaybackCommandListener listener)
+    {
+        this.listeners.add(listener);
+    }
+
+    /**
+     * Removes a playback listener.
+     *
+     * @param listener - The listener to remove.
+     */
+    public void removeCommandListener(PlaybackCommandListener listener)
+    {
+        this.listeners.remove(listener);
+    }
+
+    /**
+     * Triggers all the command listeners.
+     *
+     * @param command - The command to trigger.
+     * @param data    - Extra command data.
+     */
+    protected void triggerCommandListeners(PlaybackCommand command, Object data)
+    {
+        for (PlaybackCommandListener listener : this.listeners)
+        {
+            listener.onCommand(command, data);
+        }
+    }
 }