Rename file to upload to avoid overwrites in server

AndroidManifest.xml

@@ -18,7 +18,7 @@
  -->
 <manifest package="eu.alefzero.owncloud"
     android:versionCode="1"
-    android:versionName="0.1.171B" xmlns:android="http://schemas.android.com/apk/res/android">
+    android:versionName="0.1.172B" xmlns:android="http://schemas.android.com/apk/res/android">
 
     <uses-permission android:name="android.permission.GET_ACCOUNTS" />
     <uses-permission android:name="android.permission.USE_CREDENTIALS" />

src/eu/alefzero/owncloud/files/services/FileUploader.java

@@ -2,6 +2,9 @@ package eu.alefzero.owncloud.files.services;
 
 import java.io.File;
 
+import org.apache.commons.httpclient.methods.GetMethod;
+import org.apache.commons.httpclient.methods.HeadMethod;
+
 import android.accounts.Account;
 import android.accounts.AccountManager;
 import android.app.Notification;
@@ -168,7 +171,8 @@ public class FileUploader extends Service implements OnDatatransferProgressListe
                 mimeType = "application/octet-stream";
             
             mCurrentIndexUpload = i;
-            if (wc.putFile(mLocalPaths[i], mRemotePaths[i], mimeType)) {
+            mRemotePaths[i] = getAvailableRemotePath(wc, mRemotePaths[i]);
+            if (mRemotePaths[i] != null && wc.putFile(mLocalPaths[i], mRemotePaths[i], mimeType)) {
                 mSuccessCounter++;
                 OCFile new_file = new OCFile(mRemotePaths[i]);
                 new_file.setMimetype(mimeType);
@@ -191,6 +195,46 @@ public class FileUploader extends Service implements OnDatatransferProgressListe
         run();
     }
 
+    /**
+     * Checks if remotePath does not exist in the server and returns it, or adds a suffix to it in order to avoid the server
+     * file is overwritten.
+     * 
+     * @param string
+     * @return
+     */
+    private String getAvailableRemotePath(WebdavClient wc, String remotePath) {
+        Boolean check = wc.existsFile(remotePath);
+        if (check == null) {    // null means fail
+            return null;
+        } else if (!check) {
+            return remotePath;
+        }
+    
+        int pos = remotePath.lastIndexOf(".");
+        String suffix = "";
+        String extension = "";
+        if (pos >= 0) {
+            extension = remotePath.substring(pos+1);
+            remotePath = remotePath.substring(0, pos);
+        }
+        int count = 2;
+        while (check != null && check) {
+            suffix = " (" + count + ")";
+            if (pos >= 0)
+                check = wc.existsFile(remotePath + suffix + "." + extension);
+            else
+                check = wc.existsFile(remotePath + suffix);
+            count++;
+        }
+        if (check == null) {
+            return null;
+        } else if (pos >=0) {
+            return remotePath + suffix + "." + extension;
+        } else {
+            return remotePath + suffix;
+        }
+    }
+
     @Override
     public void transferProgress(long progressRate) {
         mSendData += progressRate;

src/eu/alefzero/webdav/WebdavClient.java

@@ -252,6 +252,23 @@ Log.e("ASD", ""+username);
         }
         return true;
     }
+    
+    
+    /**
+     * Check if a file exists in the OC server
+     * 
+     * @return      'Boolean.TRUE' if the file exists; 'Boolean.FALSE' it doesn't exist; NULL if couldn't be checked
+     */
+    public Boolean existsFile(String path) {
+        try {
+            HeadMethod head = new HeadMethod(mUri.toString() + WebdavUtils.encodePath(path));
+            int status = executeMethod(head);
+            return (status == HttpStatus.SC_OK);
+        } catch (Exception e) {
+            e.printStackTrace();
+            return null;
+        }
+    }
 
 
     /**