diff --git a/lib/componentlib.class.php b/lib/componentlib.class.php
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+<?php  //$Id$
+
+///////////////////////////////////////////////////////////////////////////
+//                                                                       //
+// NOTICE OF COPYRIGHT                                                   //
+//                                                                       //
+// Moodle - Modular Object-Oriented Dynamic Learning Environment         //
+//          http://moodle.com                                            //
+//                                                                       //
+// Copyright (C) 2001-3001 Martin Dougiamas        http://dougiamas.com  //
+//           (C) 2001-3001 Eloy Lafuente (stronk7) http://contiento.com  //
+//                                                                       //
+// This program is free software; you can redistribute it and/or modify  //
+// it under the terms of the GNU General Public License as published by  //
+// the Free Software Foundation; either version 2 of the License, or     //
+// (at your option) any later version.                                   //
+//                                                                       //
+// This program 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 General Public License for more details:                          //
+//                                                                       //
+//          http://www.gnu.org/copyleft/gpl.html                         //
+//                                                                       //
+///////////////////////////////////////////////////////////////////////////
+
+// This library includes all the necessary stuff to use the one-click
+// download and install feature of Moodle, used to keep updated some
+// items like languages, pear, enviroment... i.e, components.
+// 
+// It has been developed harcoding some important limits that are 
+// explained below:
+//    - It only can check, download and install items under moodledata.
+//    - Every downloadeable item must be one zip file.
+//    - The zip file root content must be 1 directory, i.e, everything
+//      stored under 1 directory.
+//    - Zip file name and root directory must have the same name (but 
+//      the .zip, of course).
+//    - Every .zip file must be defined in one .md5 file that will be
+//      stored in the same remote directory that the .zip file.
+//    - The name of such .md5 file is free, although it's recommended
+//      to use the same name than the .zip (that's the default 
+//      assumption if no specified).
+//    - Every .md5 file will be a comma separated (CVS) file where each
+//      line will follow this formar:
+//        - Field 1: name of the zip file (without extension). Mandatory.
+//        - Field 2: md5 of the zip file. Mandatory.
+//        - Field 3: whatever you want. Optional.
+// With all these details present, the process will perform this tasks:
+//    - Perform security checks. Only admins are allowed to use this.
+//    - Perform server checks. fopen must allow to open remote URLs.
+//    - Read the .md5 file from source (1).
+//    - Extract the correct line for the .zip being requested.
+//    - Compare it with the local .md5 file (2).
+//    - If different:
+//        - Download the newer .zip file from source.
+//        - Calculate its md5 (3).
+//        - Compare (1) and (3).
+//        - If equal:
+//            - Delete old directory.
+//            - Uunzip the newer .zip file.
+//            - Create the new local .md5 file.
+//            - Delete the .zip file.
+//        - If different:
+//            - ERROR. Old package won't be modified. We shouldn't
+//              reach here ever.
+//    - If fopen is not available, a message text about how to do
+//      the process manually will be generated.
+// That's all!
+
+/**
+ * This class is used to chack, download and install items from
+ * download.moodle.org to the moodledata directory. It always
+ * return true/false in all their public methods to say if
+ * execution has ended succesfuly or not. If there is any problem
+ * its getError() method can be called, returning one error string
+ * to be used with the standard get/print_string() functions.
+ */
+class component_installer {
+
+    var $sourcebase;   /// Full http URL, base for downloadeable items
+    var $zippath;      /// Relative path (from sourcebase) where the 
+                       /// downloadeable item resides.
+    var $zipfilename;  /// Name of the .zip file to be downloaded
+    var $md5filename;  /// Name of the .md5 file to be read
+    var $componentname;/// Name of the component. Must be the zip name without
+                       /// the extension. And it defines a lot of things:
+                       /// the md5 line to search for, the default m5 file name
+                       /// and the name of the root dir stored inside the zip file
+    var $destpath;     /// Relative path (from moodledata) where the .zip
+                       /// file will be expanded.
+    var $errorstring;  /// Latest error produced. It will contain one lang string key.
+    var $extramd5info; /// Contents of the optional third field in the .md5 file.
+    var $requisitesok; /// Flag to see if requisites check has been passed ok.
+
+    /**
+     * Standard constructor of the class. It will initialize all attributes.
+     * without performing any check at all.
+     *
+     * @param string Full http URL, base for downloadeable items
+     * @param string Relative path (from sourcebase) where the 
+     *               downloadeable item resides
+     * @param string Name of the .zip file to be downloaded
+     * @param string Name of the .md5 file to be read (default '' = same 
+     *               than zipfilename)
+     * @param string Relative path (from moodledata) where the .zip file will 
+     *               be expanded (default='' = moodledataitself)
+     * @return object
+     */
+    function component_installer ($sourcebase, $zippath, $zipfilename, $md5filename='', $destpath='') {
+
+        $this->sourcebase   = $sourcebase;
+        $this->zippath      = $zippath;
+        $this->zipfilename  = $zipfilename;
+        $this->md5filename  = $md5filename;
+        $this->componentname= '';
+        $this->destpath     = $destpath;
+        $this->errorstring  = '';
+        $this->extramd5info = '';
+        $this->requisitesok = false;
+    }
+
+    /**
+     * This function will check if everything is properly set to begin
+     * one installation. It'll check for fopen wrappers enabled and
+     * admin privileges. Also, it will check for required settings
+     * and will fill everything as needed.
+     *
+     * @return boolean true/false (plus detailed error in errorstring)
+     */
+    function check_requisites() {
+
+    /// Check for admin (this will be out in the future)
+        if (!isadmin()) {
+            $this->errorstring='onlyadmicaninstallcomponents';
+            return false;
+        } else {
+        /// Check for fopen remote enabled
+            if (!ini_get('allow_url_fopen')) {
+                $this->errorstring='remotedownloadnotallowed';
+                return false;
+            }
+        }
+    /// Check that everything we need is present
+        if (empty($this->sourcebase) || empty($this->zippath) || empty($this->zipfilename)) {
+            $this->errorstring='missingrequiredfield';
+            return false;
+        }
+    /// Check for correct sourcebase (this will be out in the future)
+        if ($this->sourcebase != 'http://download.moodle.org') {
+            $this->errorstring='wrongsourcebase';
+            return false;
+        }
+    /// Check the zip file is a correct one (by extension)
+        if (stripos($this->zipfilename, '.zip') === false) {
+            $this->errorstring='wrongzipfilename';
+            return false;
+        }
+    /// Calculate the componentnamea
+        $pos = stripos($this->zipfilename, '.zip');
+        $this->componentname = substr($this->zipfilename, 0, $pos+1);
+    /// Calculate md5filename if it's empty
+        if (empty($this->md5filename)) {
+            $this->md5filename = $this->componentname.'md5';
+        }
+    /// Set the requisites passed flag
+        $this->requisitesok = true;
+        return true;
+    }
+
+    /**
+     * This function will download the specified md5 file, looking for the
+     * current componentname, returning its md5 field and storing extramd5info
+     * if present
+     *
+     * @return mixed md5 present in server (or false if error)
+     */
+    function get_remote_md5() {
+
+    /// Check requisites are passed
+        if (!$this->requisitesok) {
+            $this->errorstring='requisitesnotpassed';
+            return false;
+        }
+
+    /// Define and retrieve the full md5 file
+        $source = $this->sourcebase.'/'.$this->zippath.'/'.$this->md5filename;
+        $availablecomponents = array();
+        if ($fp = fopen($source, 'r')) {
+        /// Read from URL, each line will be one component
+            while(!feof ($fp)) {
+                $availablecomponents[] = split(',', fgets($fp,1024));
+            }
+            fclose($fp);
+        /// If no components have been found, return error
+            if (empty($availablecomponents)) {
+                $this->errorstring='cannotdownloadmd5file';
+                return false;
+            }
+        /// Build an associative array of components, storing it in the 
+        /// Look for our expected componentname
+            
+            print_object($availablecomponents);
+            
+        } else {
+        /// Return error
+            $this->errorstring='cannotdownloadcomponent';
+            return false;
+        }
+
+    }
+
+    /**
+     * This function returns the errorstring
+     *
+     * @return string the error string
+     */
+    function get_error_string() {
+        return $this->errorstring;
+    }
+
+
+} /// End of component_installer class
+
+?>
+