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com.hfg xml, html, svg, and bioinformatics utility library
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package com.hfg.security;

import com.hfg.util.StringUtil;

import java.io.BufferedReader;
import java.io.File;
import java.io.FileReader;

//------------------------------------------------------------------------------
/**
 * Simple login store to keep passwords out of the source code.
 * Unless otherwise specified the default file is called '.credMgr' and is found
 * in the user's home directory. The file should only be readable by the account owner.
 * The contents lines are expected to be three whitespace-separated fields: the key, the login, and the password.
 *
 * @author J. Alex Taylor, hairyfatguy.com
 */
//------------------------------------------------------------------------------
// com.hfg XML/HTML Coding Library
//
// This library is free software; you can redistribute it and/or
// modify it under the terms of the GNU Lesser General Public
// License as published by the Free Software Foundation; either
// version 2.1 of the License, or (at your option) any later version.
//
// This library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
// Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public
// License along with this library; if not, write to the Free Software
// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
//
// J. Alex Taylor, President, Founder, CEO, COO, CFO, OOPS hairyfatguy.com
// [email protected]
//------------------------------------------------------------------------------

public class CredentialsMgr
{
   private File mFile;

   private static String sDefaultFilename = ".credMgr";

   //###########################################################################
   // CONSTRUCTORS
   //###########################################################################

   //---------------------------------------------------------------------------
   public CredentialsMgr()
   {
      this(new File(System.getProperty("user.home"), sDefaultFilename));
   }

   //---------------------------------------------------------------------------
   public CredentialsMgr(File inFile)
   {
      mFile = inFile;
   }

   //###########################################################################
   // PUBLIC METHODS
   //###########################################################################

   //---------------------------------------------------------------------------
   public File getFile()
   {
      return mFile;
   }

   //---------------------------------------------------------------------------
   public LoginCredentials get(String inKey)
      throws SecurityException
   {
      LoginCredentials credentials = null;

      if (! mFile.exists())
      {
         throw new SecurityException("The CredentialsMgr file " + StringUtil.singleQuote(mFile.getPath()) + " doesn't exist!");
      }
      else if (! mFile.canRead())
      {
         throw new SecurityException("No permissions for reading the CredentialsMgr file " + StringUtil.singleQuote(mFile.getPath()) + "!");
      }

      BufferedReader reader = null;
      try
      {
         try
         {
            reader = new BufferedReader(new FileReader(getFile()));
            String line;
            while ((line = reader.readLine()) != null)
            {
               line = line.trim();
               if (line.startsWith("#"))
               {
                  continue; // Allow comment lines
               }

               String fields[] = line.split("\\s+");
               if (fields.length >= 3
                   && fields[0].equals(inKey))
               {
                  credentials = new LoginCredentials(fields[1], fields[2].toCharArray());
                  break;
               }
            }
         }
         finally
         {
            if (reader != null)
            {
               reader.close();
            }
         }
      }
      catch (Exception e)
      {
         throw new SecurityException("Problem accessing the CredentialsMgr file " + StringUtil.singleQuote(mFile.getPath()) + "!", e);
      }

      if (null == credentials)
      {
         throw new SecurityException("The key " + StringUtil.singleQuote(inKey)
                                     + " couldn't be found in the CredentialsMgr file " + StringUtil.singleQuote(mFile.getPath()) + "!");
      }

      return credentials;
   }
}