/**
    * Copyright 2014 Internet2
    *
    * Licensed under the Apache License, Version 2.0 (the "License");
    * you may not use this file except in compliance with the License.
    * You may obtain a copy of the License at
    *
    *   http://www.apache.org/licenses/LICENSE-2.0
    *
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS,
   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   * See the License for the specific language governing permissions and
   * limitations under the License.
   */
  /*
   * $Id: Morph.java,v 1.3 2008-10-29 05:32:23 mchyzer Exp $
   * 
   * Copyright University of Pennsylvania 2004
   */
  package edu.internet2.middleware.grouperInstaller.morphString;
  
  import java.io.File;
  import java.io.IOException;
  import java.util.Properties;
  
  import edu.internet2.middleware.grouperInstaller.util.GrouperInstallerUtils;
  
  /**
   * @author Chris Hyzer
   */
  public class Morph {
  
    /**
     * 
     */
    public static final String ENCRYPT_KEY = "encrypt.key";
  
    /**
     * strip the prefix off
     * @param string
     * @param prefix
     * @return the string without the prefix
     */
    public static String stripPrefix(String string, String prefix) {
      if (string == null || prefix == null) {
        return string;
      }
      if (string.startsWith(prefix)) {
        return string.substring(prefix.length(), string.length());
      }
      return string;
    }
    
    
    /**
     * 
     * @param file
     *          is the file to read into a string
     * 
     * @return String
     */
    public static String readFileIntoStringUtf8(File file) {
    
      if (file == null) {
        return null;
      }
      try {
        return GrouperInstallerUtils.readFileToString(file, "UTF-8");
      } catch (IOException ioe) {
        throw new RuntimeException(ioe);
      }
    }
    
    
    public static String readFromFileIfFileUtf8(String in, boolean disableExternalFileLookup) {
      
      if (in == null || "".equals(in)) {
        return in;
      }
      
      boolean isFile = false;
      if (in.startsWith("file:")) {
        isFile = true;
        in = stripPrefix(in, "file:");
        File file = new File(in);
        if (!file.exists() || !file.isFile()) {
          throw new RuntimeException("Cant find or read file: '" + in + "'");
        }
      } else {
        if (!disableExternalFileLookup) {
          File file = new File(in);
          if (file.exists() && file.isFile()) {
            isFile = true;
          }
        }
      }
      
      //see if it is a file reference
     if (isFile) {
       //read the contents of the file into a string
       return readFileIntoStringUtf8(new File(in));
     }
     return in;
   
   }
 
   /** if testing, and not relying on morph key being there, use this */
   public static String testMorphKey = null;
 
   /**
    * Constructor for Morph.
    */
   private Morph() {
   }
 
 }