Partial fix for AWC-999: Content upload guesses character encoding and offers the user the chance to change it.

TODO: Fix the "Modify Content Properties" to include the encoding as a changeable option.

Modified other entry points of content into the system.  All calls to ContentWriter.setEncoding("UTF-8") need some serious examination.
It is no longer necessary to assume anything about the encoding.  The worst case scenario is that we guess the encoding from the stream
without giving the user the chance to change it.  This works for most non-interactive scenarios like CIFS, WebDAV and FTP, now.


git-svn-id: https://svn.alfresco.com/repos/alfresco-enterprise/alfresco/HEAD/root@6113 c4b6b30b-aa2e-2d43-bbcb-ca4b014f7261

source/java/org/alfresco/web/bean/repository/Repository.java

@@ -22,7 +22,9 @@
  * http://www.alfresco.com/legal/licensing" */
 package org.alfresco.web.bean.repository;
 
+import java.io.InputStream;
 import java.io.Serializable;
+import java.nio.charset.Charset;
 import java.text.MessageFormat;
 import java.util.ArrayList;
 import java.util.Collections;
@@ -37,6 +39,7 @@ import org.alfresco.error.AlfrescoRuntimeException;
 import org.alfresco.model.ContentModel;
 import org.alfresco.repo.configuration.ConfigurableService;
 import org.alfresco.repo.content.MimetypeMap;
+import org.alfresco.repo.content.encoding.ContentCharsetFinder;
 import org.alfresco.repo.content.metadata.MetadataExtracter;
 import org.alfresco.repo.content.metadata.MetadataExtracterRegistry;
 import org.alfresco.repo.transaction.RetryingTransactionHelper;
@@ -507,6 +510,21 @@ public final class Repository
           return false;
       }
    }
+   
+   /**
+    * Extract the characterset from the stream
+    * 
+    * @param context       the Faces Context
+    * @param is            the stream of characters or data
+    * @param mimetype      the stream's mimetype, or <tt>null</tt> if unknown
+    * @return              Returns the guessed characterset and never <tt>null</tt>
+    */
+   public static String guessEncoding(FacesContext context, InputStream is, String mimetype)
+   {
+      ContentCharsetFinder charsetFinder = getServiceRegistry(context).getMimetypeService().getContentCharsetFinder();
+      Charset charset = charsetFinder.getCharset(is, mimetype);
+      return charset.name();
+   }
 
    /**
     * Query a list of Person type nodes from the repo