Added basic Subsonic interface

app/src/main/java/com/cappielloantonio/play/subsonic/SubsonicPreferences.java

@@ -0,0 +1,73 @@
+package com.cappielloantonio.play.subsonic;
+
+import com.cappielloantonio.play.subsonic.utils.StringUtil;
+
+import java.security.MessageDigest;
+import java.security.NoSuchAlgorithmException;
+import java.util.UUID;
+
+public class SubsonicPreferences {
+    private String serverUrl;
+    private String username;
+    private String clientName = "SubsonicJavaClient";
+    private int streamBitRate = 192;
+    private String streamFormat = "mp3";
+
+    private final SubsonicAuthentication authentication;
+
+    public SubsonicPreferences(String serverUrl, String username, String password) {
+        this.serverUrl = serverUrl;
+        this.username = username;
+        this.authentication = new SubsonicAuthentication(password);
+    }
+
+    public String getServerUrl() {
+        return serverUrl;
+    }
+
+    public String getUsername() {
+        return username;
+    }
+
+    public String getClientName() {
+        return clientName;
+    }
+
+    public int getStreamBitRate() {
+        return streamBitRate;
+    }
+
+    public String getStreamFormat() {
+        return streamFormat;
+    }
+
+    public SubsonicAuthentication getAuthentication() {
+        return authentication;
+    }
+
+    public void setPassword(String password) {
+        authentication.update(password);
+    }
+
+    public static class SubsonicAuthentication {
+        private String salt;
+        private String token;
+
+        public SubsonicAuthentication(String password) {
+            update(password);
+        }
+
+        public String getSalt() {
+            return salt;
+        }
+
+        public String getToken() {
+            return token;
+        }
+
+        void update(String password) {
+            this.salt = UUID.randomUUID().toString();
+            this.token = StringUtil.tokenize(password + salt);
+        }
+    }
+}