added user plugin update mechanism

mobile/README.md

@@ -7,7 +7,7 @@ The Android App behaves like the desktop version, but uses the mobile view, whic
 
 - supports all official IITC plugins
 
-- easy installation of unofficial plugins (installation via plugin preference, click on *.user.js file or URL, email attachement etc.)
+- easy installation and update of unofficial plugins (installation via plugin preference, click on *.user.js file or URL, email attachement etc.)
 
 - show users current location
 
@@ -19,7 +19,7 @@ The Android App behaves like the desktop version, but uses the mobile view, whic
 
 - configurable fullscreen modes (includes immersive mode on Android 4.4+)
 
-- navigation drawers for IITC views, layer chooser and highlighters
+- navigation drawers for IITC panes, layer chooser and highlighters
 
 - in-app screenshots
 

mobile/src/com/cradle/iitc_mobile/IITC_FileManager.java

@@ -19,6 +19,7 @@ import android.webkit.WebResourceResponse;
 import android.widget.Toast;
 
 import com.cradle.iitc_mobile.IITC_Mobile.ResponseHandler;
+import com.cradle.iitc_mobile.async.UpdateScript;
 
 import org.json.JSONObject;
 
@@ -199,6 +200,7 @@ public class IITC_FileManager {
 
         final InputStream data = prepareUserScript(stream);
 
+        new UpdateScript(mActivity).execute(uri.getPath());
         return new WebResourceResponse("application/x-javascript", "UTF-8", data);
     }
 

mobile/src/com/cradle/iitc_mobile/async/UpdateScript.java

@@ -0,0 +1,90 @@
+package com.cradle.iitc_mobile.async;
+
+import android.app.Activity;
+import android.app.AlertDialog;
+import android.content.DialogInterface;
+import android.content.SharedPreferences;
+import android.os.AsyncTask;
+import android.preference.PreferenceManager;
+
+import com.cradle.iitc_mobile.IITC_FileManager;
+import com.cradle.iitc_mobile.Log;
+
+import java.io.File;
+import java.io.FileInputStream;
+import java.io.FileOutputStream;
+import java.io.IOException;
+import java.io.InputStream;
+import java.net.URL;
+
+public class UpdateScript extends AsyncTask<String, Void, Boolean> {
+
+    private final Activity mActivity;
+    // update interval is 2 days
+    private final long updateInterval = 1000*60*60*24*2;
+    private String mFilePath;
+    private String mScript;
+
+    public UpdateScript(final Activity activity) {
+        mActivity = activity;
+    }
+
+    @Override
+    protected Boolean doInBackground(final String... urls) {
+        try {
+            mFilePath = urls[0];
+            // check last script update
+            final SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(mActivity);
+            final long lastUpdated = prefs.getLong(mFilePath + "-update", 0);
+            final long now = System.currentTimeMillis();
+
+            // return if no update wanted
+            if (now - lastUpdated < updateInterval) return false;
+            prefs
+                    .edit()
+                    .putLong(mFilePath + "-update", now)
+                    .commit();
+
+            // get local script meta information
+            mScript = IITC_FileManager.readStream(new FileInputStream(new File(mFilePath)));
+            final String updateURL = IITC_FileManager.getScriptInfo(mScript).get("updateURL");
+            final String downloadURL = IITC_FileManager.getScriptInfo(mScript).get("downloadURL");
+
+            // get remote script meta information
+            final File file_old = new File(mFilePath);
+            final InputStream is = new URL(updateURL).openStream();
+            final String old_version = IITC_FileManager.getScriptInfo(mScript).get("version");
+            final String new_version = IITC_FileManager.getScriptInfo(IITC_FileManager.readStream(is)).get("version");
+
+            // update script if neccessary
+            if (old_version.compareTo(new_version) < 0) {
+                Log.d("plugin " + mFilePath + " outdated\n" + old_version + " vs " + new_version);
+                Log.d("updating file....");
+                IITC_FileManager.copyStream(new URL(downloadURL).openStream(), new FileOutputStream(file_old), true);
+                Log.d("...done");
+                return true;
+            }
+        } catch (final IOException e) {
+            return false;
+        }
+        return false;
+    }
+
+    protected void onPostExecute(Boolean updated) {
+        if (updated) {
+            final String name = IITC_FileManager.getScriptInfo(mScript).get("name");
+            new AlertDialog.Builder(mActivity)
+                    .setTitle("Plugin updated")
+                    .setMessage(name)
+                    .setCancelable(true)
+                    .setNeutralButton("OK", new DialogInterface.OnClickListener() {
+                        @Override
+                        public void onClick(DialogInterface dialog, int which) {
+                            dialog.cancel();
+                        }
+                    })
+                    .create()
+                    .show();
+        }
+    }
+}