<?php
set_include_path('/zg/chonoles/public_html/site/php');
include('defaults.php');

$main_css = false;
$google_code_prettify = true;
$no_robots = true;

$page_id = "viewcode";
$page_title = "View Source Code";
$page_description = "View the source code behind my website.";
$page_keywords = "view code";

include('begin.php');


//   A general comment:
//
//   I am keeping this page, basically, as "dumb" as possible. I suppose a careless 
//   implementation of a page like this could create some security problems.
//   So please forgive the safer but low-brow "check a billion cases".
// 
//   On a related note, I was advised to hide the file path to my account,
//   which is why you will see the word CENSORED appear in its place.


//----------------------------//
//  WHAT CODE SHOULD WE GET?  //
//----------------------------//

$page = $_GET['page'];
$lang = $_GET['lang'];
$location = '';


// Allowed pages
$is_allowed_page = true;
switch($page)
{
  case 'home':                $append = '/';                             break;
  case 'research':            $append = '/research/';                    break;
  case 'teaching':            $append = '/teaching/';                    break;
  case 'expository-notes':    $append = '/expository-notes/';            break;
  case 'links':               $append = '/links/';                       break;
  case 'miscellany':          $append = '/miscellany/';                  break;
  case 'quotations':          $append = '/miscellany/quotations/';       break;
  case 'jokes':               $append = '/miscellany/jokes/';            break;
  case 'music':               $append = '/miscellany/music/';            break;
  case 'webcomics':           $append = '/miscellany/webcomics/';        break;
  case 'colophon':            $append = '/miscellany/colophon/';         break;
  case 'making-a-website':    $append = '/miscellany/making-a-website/'; break;
  default:                    $is_allowed_page = false;                  break;
}
// If getting PHP, get the file on the server.
// If getting HTML, get the finished output by making an HTTP request.
// Ignore any language other than PHP and HTML for these pages.
if($is_allowed_page && $lang == 'php')  { $location = '/zg/chonoles/public_html' . $append . 'index.php'; }
elseif($is_allowed_page) { $lang = 'html'; $location = 'http://math.uchicago.edu/~chonoles' . $append; }


// Allowed PHP files
$is_allowed_php = true;
switch($page)
{
  case 'defaults':            $append = '/defaults.php';            break;
  case 'begin':               $append = '/begin.php';               break;
  case 'end':                 $append = '/end.php';                 break;
  case 'header':              $append = '/header.php';              break;
  case 'footer':              $append = '/footer.php';              break;
  case 'gcp-css':             $append = '/gcp-css.php';             break;
  case 'gcp-js':              $append = '/gcp-js.php';              break;
  case 'mathjax':             $append = '/mathjax.php';             break;
  case 'main-css':            $append = '/main-css.php';            break;
  case 'no-robots':           $append = '/no-robots.php';           break;
  case 'section-begin':       $append = '/section-begin.php';       break;
  case 'section-end':         $append = '/section-end.php';         break;
  case 'subsection-begin':    $append = '/subsection-begin.php';    break;
  case 'subsection-end':      $append = '/subsection-end.php';      break;
  case 'course-toggle':       $append = '/course-toggle.php';       break;
  case 'viewcode-css':        $append = '/viewcode-css.php';        break;
  default:                    $is_allowed_php = false;              break;
}
// Ignore any language other than PHP for these files.
if($is_allowed_php) { $lang = 'php'; $location = '/zg/chonoles/public_html/site/php' . $append; }


// Misc allowed others
switch($page)
{
  case 'stylesheet':
    $location = 'http://math.uchicago.edu/~chonoles/site/css/main.css'; $lang='css'; break;
//  case 'viewcode':
//    $location = '/zg/chonoles/public_html/viewcode/index.php'; $lang='php'; break;
  default:
    if($location == '') exit("oops, that's not an allowed page");
}


//  Sets the Google Code Prettify language (there is no Prettify file for PHP yet).
if ($lang == 'css') { $prettify_languages = array('css'); $prettify_hint = ' lang-css'; }


//----------------------//
//  DISPLAY THAT CODE!  //
//----------------------//

//  Gets the raw contents of the relevant file.
$contents = file_get_contents($location);

//  Censors my file path.
$contents = str_replace('/zg/chonoles/public_html', 'CENSORED', $contents);

//  Converts ampersands, quotes, and < and > to their corresponding HTML entities.
$contents = htmlspecialchars($contents);

//  Turns URLs into links; but ignore "href" when this page is processing itself.
if ($page != 'viewcode') { $url_regex_pattern = '/(href|src|og:image&quot;\scontent|og:url&quot;\scontent)=&quot;([^#].+?)&quot;/'; }
else                     { $url_regex_pattern =      '/(src|og:image&quot;\scontent|og:url&quot;\scontent)=&quot;([^#].+?)&quot;/'; }
$contents = preg_replace($url_regex_pattern, '$1=&quot;<a href="$2">$2</a>&quot;', $contents);

//  Turns my PHP includes into links.
if ($lang == 'php') {
    $contents = preg_replace('/include\(\'(.+?)\.php/',
    'include(\'<a href="http://math.uchicago.edu/~chonoles/viewcode/?page=$1">$1.php</a>', $contents); }

//  Outputs the result, with the prettify language specified if necessary.
echo "\n", '<pre id="viewcode" class="prettyprint' , $prettify_hint , '">' , $contents;

//  Outputs the box in the lower left, unless this pages is processing itself.
//if ($page != 'viewcode') { echo '<a id="view_viewcode_code" href="http://math.uchicago.edu/~chonoles/' .
//                                'viewcode/?page=viewcode">Curious about how this page works?</a>'; }

//  Close the pre element.
echo '</pre>', "\n";

include('end.php');
?>