<?
/**
 * Session.php
 * 
 * The Session class is meant to simplify the task of keeping
 * track of logged in users and also guests.
 *
 * Written by: Jpmaster77 a.k.a. The Grandmaster of C++ (GMC)
 * Last Updated: August 19, 2004
 */
include("database.php");
include("mailer.php");
include("form.php");

class Session
{
   var $username;     //Username given on sign-up
   var $userid;       //Random value generated on current login
   var $userlevel;    //The level to which the user pertains
   var $first_name;
   var $time;         //Time user was last active (page loaded)
   var $logged_in;    //True if user is logged in, false otherwise
   var $userinfo = array();  //The array holding all user info
   var $url;          //The page url current being viewed
   var $referrer;     //Last recorded site page viewed
   /**
    * Note: referrer should really only be considered the actual
    * page referrer in process.php, any other time it may be
    * inaccurate.
    */

   /* Class constructor */
   function Session(){
      $this->time = time();
      $this->startSession();
   }

   /**
    * startSession - Performs all the actions necessary to 
    * initialize this session object. Tries to determine if the
    * the user has logged in already, and sets the variables 
    * accordingly. Also takes advantage of this page load to
    * update the active visitors tables.
    */
   function startSession(){
      global $database;  //The database connection
      session_start();   //Tell PHP to start the session

      /* Determine if user is logged in */
      $this->logged_in = $this->checkLogin();

      /**
       * Set guest value to users not logged in, and update
       * active guests table accordingly.
       */
      if(!$this->logged_in){
         $this->username = $_SESSION['username'] = GUEST_NAME;
         $this->userlevel = GUEST_LEVEL;
         $database->addActiveGuest($_SERVER['REMOTE_ADDR'], $this->time);
      }
      /* Update users last active timestamp */
      else{
         $database->addActiveUser($this->username, $this->time);
      }
      
      /* Remove inactive visitors from database */
      $database->removeInactiveUsers();
      $database->removeInactiveGuests();
      
      /* Set referrer page */
      if(isset($_SESSION['url'])){
         $this->referrer = $_SESSION['url'];
      }else{
         $this->referrer = "/";
      }

      /* Set current url */
      $this->url = $_SESSION['url'] = $_SERVER['PHP_SELF'];
   }

   /**
    * checkLogin - Checks if the user has already previously
    * logged in, and a session with the user has already been
    * established. Also checks to see if user has been remembered.
    * If so, the database is queried to make sure of the user's 
    * authenticity. Returns true if the user has logged in.
    */
   function checkLogin(){
      global $database;  //The database connection
      /* Check if user has been remembered */
      if(isset($_COOKIE['cookname']) && isset($_COOKIE['cookid'])){
         $this->username = $_SESSION['username'] = $_COOKIE['cookname'];
         $this->userid   = $_SESSION['userid']   = $_COOKIE['cookid'];
      }

      /* Username and userid have been set and not guest */
      if(isset($_SESSION['username']) && isset($_SESSION['userid']) &&
         $_SESSION['username'] != GUEST_NAME){
         /* Confirm that username and userid are valid */
         if($database->confirmUserID($_SESSION['username'], $_SESSION['userid']) != 0){
            /* Variables are incorrect, user not logged in */
            unset($_SESSION['username']);
            unset($_SESSION['userid']);
            return false;
         }

         /* User is logged in, set class variables */
         $this->userinfo  = $database->getUserInfo($_SESSION['username']);
         $this->username  = $this->userinfo['username'];
         $this->userid    = $this->userinfo['userid'];
         $this->userlevel = $this->userinfo['userlevel'];
		 $this->first_name = $this->userinfo['first_name'];
         return true;
      }
      /* User not logged in */
      else{
         return false;
      }
   }

   /**
    * login - The user has submitted his username and password
    * through the login form, this function checks the authenticity
    * of that information in the database and creates the session.
    * Effectively logging in the user if all goes well.
    */
   function login($subuser, $subpass, $subremember){
      global $database, $form;  //The database and form object

      /* Username error checking */
      $field = "user";  //Use field name for username
      if(!$subuser || strlen($subuser = trim($subuser)) == 0){
         $form->setError($field, "* Username not entered");
      }
      else{
         /* Check if username is not alphanumeric */
         if(!eregi("^([0-9a-z.])*$", $subuser)){
            $form->setError($field, "* Username not alphanumeric");
         }
      }

      /* Password error checking */
      $field = "pass";  //Use field name for password
      if(!$subpass){
         $form->setError($field, "* Password not entered");
      }
      
      /* Return if form errors exist */
      if($form->num_errors > 0){
         return false;
      }

      /* Checks that username is in database and password is correct */
      $subuser = stripslashes($subuser);
      $result = $database->confirmUserPass($subuser, md5($subpass));

      /* Check error codes */
      if($result == 1){
         $field = "user";
         $form->setError($field, "* Username not found");
      }
      else if($result == 2){
         $field = "pass";
         $form->setError($field, "* Invalid password");
      }
      
      /* Return if form errors exist */
      if($form->num_errors > 0){
         return false;
      }

      /* Username and password correct, register session variables */
      $this->userinfo  = $database->getUserInfo($subuser);
      $this->username  = $_SESSION['username'] = $this->userinfo['username'];
      $this->userid    = $_SESSION['userid']   = $this->generateRandID();
      $this->userlevel = $this->userinfo['userlevel'];
      
      /* Insert userid into database and update active users table */
      $database->updateUserField($this->username, "userid", $this->userid);
      $database->addActiveUser($this->username, $this->time);
      $database->removeActiveGuest($_SERVER['REMOTE_ADDR']);

      /**
       * This is the cool part: the user has requested that we remember that
       * he's logged in, so we set two cookies. One to hold his username,
       * and one to hold his random value userid. It expires by the time
       * specified in constants.php. Now, next time he comes to our site, we will
       * log him in automatically, but only if he didn't log out before he left.
       */
      if($subremember){
         setcookie("cookname", $this->username, time()+COOKIE_EXPIRE, COOKIE_PATH);
         setcookie("cookid",   $this->userid,   time()+COOKIE_EXPIRE, COOKIE_PATH);
      }

      /* Login completed successfully */
      return true;
   }

   /**
    * logout - Gets called when the user wants to be logged out of the
    * website. It deletes any cookies that were stored on the users
    * computer as a result of him wanting to be remembered, and also
    * unsets session variables and demotes his user level to guest.
    */
   function logout(){
      global $database;  //The database connection
      /**
       * Delete cookies - the time must be in the past,
       * so just negate what you added when creating the
       * cookie.
       */
      if(isset($_COOKIE['cookname']) && isset($_COOKIE['cookid'])){
         setcookie("cookname", "", time()-COOKIE_EXPIRE, COOKIE_PATH);
         setcookie("cookid",   "", time()-COOKIE_EXPIRE, COOKIE_PATH);
      }

      /* Unset PHP session variables */
      unset($_SESSION['username']);
      unset($_SESSION['userid']);

      /* Reflect fact that user has logged out */
      $this->logged_in = false;
      
      /**
       * Remove from active users table and add to
       * active guests tables.
       */
      $database->removeActiveUser($this->username);
      $database->addActiveGuest($_SERVER['REMOTE_ADDR'], $this->time);
      
      /* Set user level to guest */
      $this->username  = GUEST_NAME;
      $this->userlevel = GUEST_LEVEL;
   }

   /**
    * register - Gets called when the user has just submitted the
    * registration form. Determines if there were any errors with
    * the entry fields, if so, it records the errors and returns
    * 1. If no errors were found, it registers the new user and
    * returns 0. Returns 2 if registration failed.
    */
   function register($subuser, $subpass, $subemail, $subemail_from, $first_name, $last_name, $gender, $home_page, $school, $phone, $fax, $address1, $address2, $city, $state, $zipcode, $country, $language, $time_zone){
      global $database, $form, $mailer;  //The database, form and mailer object
      
      /* Username error checking */
      $field = "user";  //Use field name for username
      if(!$subuser || strlen($subuser = trim($subuser)) == 0){
         $form->setError($field, "* Username not entered");
      }
      else{
         /* Spruce up username, check length */
         $subuser = stripslashes($subuser);
         if(strlen($subuser) < 4){
            $form->setError($field, "* Username below 4 characters");
         }
         else if(strlen($subuser) > 30){
            $form->setError($field, "* Username above 30 characters");
         }
         /* Check if username is not alphanumeric */
         else if(!eregi("^([0-9a-z.])+$", $subuser)){
            $form->setError($field, "* Username not alphanumeric");
         }
         /* Check if username is reserved */
         else if(strcasecmp($subuser, GUEST_NAME) == 0){
            $form->setError($field, "* Username reserved word");
         }
         /* Check if username is already in use */
         else if($database->usernameTaken($subuser)){
            $form->setError($field, "* Username already in use");
         }
         /* Check if username is banned */
         else if($database->usernameBanned($subuser)){
            $form->setError($field, "* Username banned");
         }
      }

      /* Password error checking */
      $field = "pass";  //Use field name for password
      if(!$subpass){
         $form->setError($field, "* Password not entered");
      }
      else{
         /* Spruce up password and check length*/
         $subpass = stripslashes($subpass);
         if(strlen($subpass) < 4){
            $form->setError($field, "* Password too short");
         }
         /* Check if password is not alphanumeric */
         else if(!eregi("^([0-9a-z])+$", ($subpass = trim($subpass)))){
            $form->setError($field, "* Password not alphanumeric");
         }
         /**
          * Note: I trimmed the password only after I checked the length
          * because if you fill the password field up with spaces
          * it looks like a lot more characters than 4, so it looks
          * kind of stupid to report "password too short".
          */
      }
      
      /* Email error checking */
      $field = "email";  //Use field name for email
      if(!$subemail || strlen($subemail = trim($subemail)) == 0){
         $form->setError($field, "* Email not entered");
      }
      else{
         /* Check if valid email address */
         $regex = "^[_+a-z0-9-]+(\.[_+a-z0-9-]+)*"
                 ."@[a-z0-9-]+(\.[a-z0-9-]{1,})*"
                 ."\.([a-z]{2,}){1}$";
         if(!eregi($regex,$subemail)){
            $form->setError($field, "* Email invalid");
         }
         $subemail = stripslashes($subemail);
      }
	  
	  /* Make state code uppercase */
	  $state = strtoupper($state);

      /* Errors exist, have user correct them */
      if($form->num_errors > 0){
         return 1;  //Errors with form
      }
      /* No errors, add the new account to the */
      else{
         if($database->addNewUser($subuser, md5($subpass), $subemail, $subemail_from, $first_name, $last_name, $gender, $home_page, $school, $phone, $fax, $address1, $address2, $city, $state, $zipcode, $country, $language, $time_zone)){
            if(EMAIL_WELCOME){
               $mailer->sendWelcome($subuser,$subemail,$subpass);
            }
            return 0;  //New user added succesfully
         }else{
            return 2;  //Registration attempt failed
         }
      }
   }
   
   /**
    * editAccount - Attempts to edit the user's account information
    * including the password, which it first makes sure is correct
    * if entered, if so and the new password is in the right
    * format, the change is made. All other fields are changed
    * automatically.
    */
   function editAccount($subcurpass, $subnewpass, $subemail, $subemail_from, $subfirst_name, $sublast_name, $subgender, $subhome_page, $subschool, $subphone, $subfax, $subaddress1, $subaddress2, $subcity, $substate, $subzipcode, $subcountry, $sublanguage, $subtime_zone, $subphoto){
      global $database, $form;  //The database and form object
      /* New password entered */
      if($subnewpass){
         /* Current Password error checking */
         $field = "curpass";  //Use field name for current password
         if(!$subcurpass){
            $form->setError($field, "* Current Password not entered");
         }
         else{
            /* Check if password too short or is not alphanumeric */
            $subcurpass = stripslashes($subcurpass);
            if(strlen($subcurpass) < 4 ||
               !eregi("^([0-9a-z])+$", ($subcurpass = trim($subcurpass)))){
               $form->setError($field, "* Current Password incorrect");
            }
            /* Password entered is incorrect */
            if($database->confirmUserPass($this->username,md5($subcurpass)) != 0){
               $form->setError($field, "* Current Password incorrect");
            }
         }
         
         /* New Password error checking */
         $field = "newpass";  //Use field name for new password
         /* Spruce up password and check length*/
         $subpass = stripslashes($subnewpass);
         if(strlen($subnewpass) < 4){
            $form->setError($field, "* New Password too short");
         }
         /* Check if password is not alphanumeric */
         else if(!eregi("^([0-9a-z])+$", ($subnewpass = trim($subnewpass)))){
            $form->setError($field, "* New Password not alphanumeric");
         }
      }
      /* Change password attempted */
      else if($subcurpass){
         /* New Password error reporting */
         $field = "newpass";  //Use field name for new password
         $form->setError($field, "* New Password not entered");
      }
      
      /* Email error checking */
      $field = "email";  //Use field name for email
      if($subemail && strlen($subemail = trim($subemail)) > 0){
         /* Check if valid email address */
         $regex = "^[_+a-z0-9-]+(\.[_+a-z0-9-]+)*"
                 ."@[a-z0-9-]+(\.[a-z0-9-]{1,})*"
                 ."\.([a-z]{2,}){1}$";
         if(!eregi($regex,$subemail)){
            $form->setError($field, "* Email invalid");
         }
         $subemail = stripslashes($subemail);
      }
	  
      /* Check image for errors */
	  $field = "photo";
      if($subphoto > 0){
	  	switch($subphoto) {
		case 1:
		case 2:
		$error_reason = "Image is too large.";
		break;
		case 3:
		$error_reason = "Image was only partially uploaded.";
		break;
		case 4:
		$error_reason = "No file was uploaded.";
		break;
		case 6:
		$error_reason = "Missing a temporary folder.";
		break;
		case 7:
		$error_reason = "Failed to write image to disk.";
		break;
		default:
		$error_reason = "File was not a valid image format.";
		break;
		}
        $form->setError($field, "* ".$error_reason);
      }
      
      /* Errors exist, have user correct them */
      if($form->num_errors > 0){
         return false;  //Errors with form
      }
      
      /* Update password since there were no errors */
      if($subcurpass && $subnewpass){
         $database->updateUserField($this->username,"password",md5($subnewpass));
      }
      
      /* Change Email */
      if($subemail){
         $database->updateUserField($this->username,"email",$subemail);
      }
	  
	  $database->subtractFromCountryTable($this->username);

$database->query("UPDATE ".TBL_USERS." SET email_from= '" .$subemail_from. "', first_name= '" .$subfirst_name."', last_name= '" .$sublast_name."', gender= '" .$subgender."', home_page= '" .$subhome_page."', school= '" .$subschool."', phone= '" .$subphone."', fax= '" .$subfax."', address1= '" .$subaddress1."', address2= '" .$subaddress2."', city= '" .$subcity."', state= '" .$substate."', zipcode= '" .$subzipcode."', country= '" .$subcountry."', language_id= '" .$sublanguage."', time_zone= '" .$subtime_zone."', photo= '" .$subphoto. "' WHERE username = '" .$this->username . "'");

	  $database->addToCountryTable($subcountry);
      
      /* Success! */
      return true;
   }
   
   /**
    * isAdmin - Returns true if currently logged in user is
    * an administrator, false otherwise.
    */
   function isAdmin(){
      return ($this->userlevel == ADMIN_LEVEL ||
              $this->username  == ADMIN_NAME);
   }
   
   /**
    * generateRandID - Generates a string made up of randomized
    * letters (lower and upper case) and digits and returns
    * the md5 hash of it to be used as a userid.
    */
   function generateRandID(){
      return md5($this->generateRandStr(16));
   }
   
   /**
    * generateRandStr - Generates a string made up of randomized
    * letters (lower and upper case) and digits, the length
    * is a specified parameter.
    */
   function generateRandStr($length){
      $randstr = "";
      for($i=0; $i<$length; $i++){
         $randnum = mt_rand(0,61);
         if($randnum < 10){
            $randstr .= chr($randnum+48);
         }else if($randnum < 36){
            $randstr .= chr($randnum+55);
         }else{
            $randstr .= chr($randnum+61);
         }
      }
      return $randstr;
   }
   
};


/**
 * Initialize session object - This must be initialized before
 * the form object because the form uses session variables,
 * which cannot be accessed unless the session has started.
 */
$session = new Session;

/* Initialize form object */
$form = new Form;


/* Language Check */
$lang = 'en';
$no_translation = true;

if (isset($_GET['lang'])) {
  $lang = preg_replace('/[^a-z0-9_-]/i', '', $_GET['lang']);
}

$lang_file_default = DIR_LANGUAGES.$lang.".php";
$lang_file = DIR_LANGUAGES.$lang.'/'.basename($_SERVER['PHP_SELF']);

// var_dump($lang_file);

if (file_exists($lang_file_default)) {
  include($lang_file_default);
} else if (file_exists(DIR_LANGUAGES.'en.php')) {
    include(DIR_LANGUAGES.'en.php');
}

if (file_exists($lang_file)) {
  include($lang_file);
  $no_translation = false;
} else if (file_exists(DIR_LANGUAGES.'en/'.basename($_SERVER['PHP_SELF']))) {
    include(DIR_LANGUAGES.'en/'.basename($_SERVER['PHP_SELF']));
} else {
    $no_translation = false;
}

?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Language" content="en-us" />
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1" />
<title>The SWOT Satellite Mission</title>
<link rel="stylesheet" media="screen" title="Default" href="style.css" />
<link rel="stylesheet" media="print" title="Printable" href="print.css" />
<link rel="shortcut icon" href="http://bprc.osu.edu/water/favicon.ico" />
<meta name="robots" content="index,follow">
<meta name="keywords" content="surface water elevation recovery satellite mission nasa">
<meta name="description" content="The Ohio State University Surface Water Elevation Recovery Satellite Mission.">

<!--[if lt IE 7]>
<link type="text/css" media="all" rel="stylesheet" href="main_IE.css" />
<![endif]-->

</head>
<body>

<div id="container">

<?
if ($no_translation) {
  echo '<p class="language_error"><strong>Note:</strong> This page is not currently translated in the language you requested. If you would like to help with our translation efforts, please contact <a href="mailto:toomey.10@osu.edu">Kevin Toomey</a>.</p>';
}
?>

<div id="header">
  <span id="logo"><img style="z-index: 0; position: absolute; left: 0px; top: 0px;" src="water_bg_flip.png" /><center><img src="water.png" alt="WATER: Water Elevation Recovery Satellite Mission" height="100" /></center></span>
  
  <div id="top_menu">
    <ul>
      <li id="navhome"><a href="index.php"><? echo Home; ?></a></li>
      <li id="navmission"><a href="mission_overview.php"><? echo Mission; ?></a></li>
      <li id="navscience"><a href="science.php"><? echo Science; ?></a></li>
      <li id="navgallery"><a href="gallery.php"><? echo Gallery; ?></a></li>
      <li id="navmeetings"><a href="meet.php"><? echo Meetings; ?></a></li>
      <li id="navpeople"><a href="people.php"><? echo People; ?></a></li>
      <li id="navdiscussion"><a href="discussion.php"><? echo Discussion; ?></a></li>
      <li id="navparticipate"><a href="participate.php"><? echo Participate; ?></a></li>
    </ul>
  </div>

</div>

<div id="content">

<div id="content_swothasmoved" class="content_box">
	<h1>SWOT Has Moved!</h1/
<p>We are grateful to the Byrd Polar Research Center for hosting the WATER HM and follow-on SWOT web pages.  The SWOT mission has now been approved by NASA as one of its decadal survey missions.  Thus, we are pleased that JPL is now the official home for SWOT.  Please point your browser to <a href="http://swot.jpl.nasa.gov/">http://swot.jpl.nasa.gov/</a>.</p>
</div>


<div id="content_main" class="content_box">
    <h1>WELCOME</h1>
	
<?

$id = mt_rand(1, 8);

switch ($id) {

case 1:
$image = 'waitangi_river_bank.jpg';
$caption = 'Waitangi River Bank';
break;

case 2:
$image = 'wetland01.jpg';
$caption = 'Russia Wetlands';
break;

case 3:
$image = 'iquitos_river.jpg';
$caption = 'Iquitos River';
break;

case 4:
$image = 'cosumnes_river.jpg';
$caption = 'Cosumnes River';
break;

case 5:
$image = 'okavango.jpg';
$caption = 'Okavango Flood Plain';
break;

case 6:
$image = 'amazon_sunset.jpg';
$caption = 'Amazon @ Sunset';
break;

case 7:
$image = 'amazon_river.jpg';
$caption = 'Amazon River';
break;

case 8:
$image = 'nile_river.jpg';
$caption = 'Nile River';
break;

case 9:
$image = 'nile_river.jpg';
$caption = 'Nile River';
break;

default:

break;

}

echo '
  <div class="picture"><img class="randomImage" src="images/'.$image.'" alt="'.$caption.'" width="200" height="225" />
  <p>'.$caption.'</p>
  </div>
';

?>	
<p>Welcome to the <b>SWOT satellite mission</b> concept.  Please feel free to contact us with your questions and comments.<br /><br />
 
The <u>S</u>urface <u>W</u>ater <u>O</u>cean <u>T</u>opography mission brings together two communities focused on a better understanding of the world's oceans and its terrestrial surface waters. Our understanding of the oceanic circulation at mesoscales and smaller, where most of the ocean's kinetic energy and its dissipation takes place, is poor.  Likewise, the role of internal tides as sources of mixing as well as coastal processes such as upwelling, jets, and fronts are not well understood. Given our basic need for fresh water, the most important hydrologic observations that can be made in a basin are of the temporal and spatial variations in water volumes stored in rivers, lakes, and wetlands. Unfortunately, we have poor knowledge of the global dynamics of terrestrial surface waters as well as their interactions with coastal oceans in estuaries.<br /> <br />

Thus, we propose the SWOT Satellite Mission and its wide-swath altimetry technology as a means of completely covering the world's oceans and freshwater bodies with repeated elevation measurements. SWOT is a truly cooperative and collegial joint international effort consisting of researchers worldwide. A hallmark of SWOT is our welcoming of everyone interested in solving ocean and water related problems. </p> 
 </div>
<!-- Please feel free to become a participant by clicking on the "Participate" link in the upper right of the main page. -->
	
	<div id="content_important" class="content_box">
	<h1>Important Links</h1>
	
	<ul>
	<li><a href="http://www.redding.com/news/2008/oct/14/scientists-take-experiment-to-river/">Redding Newspaper, the Record Searchlight, feature on SWOT and field work (October 2008)</a></li>
	<li><a href="http://www.khsltv.com/news/local/story.aspx?content_id=8f0eb43f-b579-4a62-b523-0156a61d2ded">KHSL TV Coverage (October 2008): Link to KHSL web page and to video of Ernesto Rodriguez</a></li>
	<li><a href="http://bprc.osu.edu/water/publications/JeffersonExchange_Alsdorf_Interview.mp3">NPR Interview with Doug Alsdorf (October 2008): 50Mb mp3 file. Scroll to time mark 54:24 to hear beginning of interview.</a></li>
        <li><a href="http://www.ostp.gov/galleries/Budget09/EarthObs1pager.pdf">OSTP requests significant funding for first 7 Decadal Survey Missions (Feb. 2008)</a></li>
        <li><a href="http://www.rules.house.gov/110/text/omni/jes/jesdivb.pdf">Decadal Survey missions in Congressional budgeting (Page 107, Dec. 2007)</a></li>
        <li><a href="http://thomas.loc.gov/cgi-bin/cpquery/T?&report=hr240&dbname=110&">Original Congressional bill naming SWOT in first 7 Decadal Survey missions (search for "SWOT", July 2007)</a></li>
	<li><a href="http://sealevel.jpl.nasa.gov/">Ocean Surface Topography from Space</a></li>
        <li><a href="http://www.legos.obs-mip.fr/recherches/missions/water/">European WatER Site</a></li>
    </ul>	
	
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	<div id="content_important" class="content_box">
	<h1>SWOT and WATER HM</h1>
	<p>In February 2008 we adopted the name SWOT, replacing the original name WATER HM.  The name change keeps the consistency with the SWOT name created by the NRC Decadal Survey.  This name change is necessary for tracing the mission to other government documents such as those indicating U.S. Congressional budgeting actions.</p>
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