RackTables git mirrors - racktables/blob - render_image.php

   1 <?php
   2
   3 require 'inc/init.php';
   4
   5 assertStringArg ('img', __FILE__);
   6 switch ($_REQUEST['img'])
   7 {
   8         case 'minirack': // rack security context
   9                 assertUIntArg ('rack_id', __FILE__);
  10                 $pageno = 'rack';
  11                 $tabno = 'default';
  12                 fixContext();
  13                 if (!permitted())
  14                         renderAccessDeniedImage();
  15                 else
  16                         renderRackThumb ($_REQUEST['rack_id']);
  17                 break;
  18         case 'progressbar': // no security context
  19                 assertUIntArg ('done', __FILE__, TRUE);
  20                 renderProgressBarImage ($_REQUEST['done']);
  21                 break;
  22         case 'view': // file security context
  23         case 'preview':
  24                 assertUIntArg ('file_id', __FILE__);
  25                 $pageno = 'file';
  26                 $tabno = 'default';
  27                 fixContext();
  28                 if (!permitted())
  29                         renderAccessDeniedImage();
  30                 else
  31                         renderFilePreview ($_REQUEST['file_id']);
  32                 break;
  33         default:
  34                 renderError();
  35 }
  36
  37 //------------------------------------------------------------------------
  38 function renderError ()
  39 {
  40         // A hardcoded value is worth of saving lots of code here.
  41         $img = imagecreatefrompng ('pix/error.png');
  42         header("Content-type: image/png");
  43         imagepng ($img);
  44         imagedestroy ($img);
  45 }
  46
  47 // Having a local caching array speeds things up. A little.
  48 function colorFromHex ($image, $hex)
  49 {
  50         static $colorcache = array ();
  51         if (isset ($colorcache[$hex]))
  52                 return $colorcache[$hex];
  53         $r = hexdec ('0x' . substr ($hex, 0, 2));
  54         $g = hexdec ('0x' . substr ($hex, 2, 2));
  55         $b = hexdec ('0x' . substr ($hex, 4, 2));
  56         $c = imagecolorallocate ($image, $r, $g, $b);
  57         $colorcache[$hex] = $c;
  58         return $c;
  59 }
  60
  61 function renderRackThumb ($rack_id = 0)
  62 {
  63         // Don't call DB extra times, hence we are most probably not the
  64         // only script wishing to acces the same data now.
  65         header("Content-type: image/png");
  66         $thumbcache = loadThumbCache ($rack_id);
  67         if ($thumbcache !== NULL)
  68                 echo $thumbcache;
  69         else
  70         {
  71                 ob_start();
  72                 generateMiniRack ($rack_id);
  73                 $capture = ob_get_contents();
  74                 ob_end_flush();
  75                 saveThumbCache ($rack_id, $capture);
  76         }
  77 }
  78
  79 // Output a binary string containing the PNG minirack.
  80 function generateMiniRack ($rack_id = 0)
  81 {
  82         if (($rackData = getRackData ($rack_id, TRUE)) == NULL)
  83         {
  84                 renderError();
  85                 return;
  86         }
  87         markupObjectProblems ($rackData);
  88         global $rtwidth;
  89         $rtdepth = 9;
  90         $offset[0] = 3;
  91         $offset[1] = 3 + $rtwidth[0];
  92         $offset[2] = 3 + $rtwidth[0] + $rtwidth[1];
  93         $totalheight = 3 + 3 + $rackData['height'] * 2;
  94         $totalwidth = $offset[2] + $rtwidth[2] + 3;
  95         $img = @imagecreatetruecolor ($totalwidth, $totalheight)
  96                 or die("Cannot Initialize new GD image stream");
  97         // cache our palette as well
  98         $color = array();
  99         foreach (array ('F', 'A', 'U', 'T', 'Th', 'Tw', 'Thw') as $statecode)
 100                 $color[$statecode] = colorFromHex ($img, getConfigVar ('color_' . $statecode));
 101         $color['black'] = colorFromHex ($img, '000000');
 102         $color['gray'] = colorFromHex ($img, 'c0c0c0');
 103         imagerectangle ($img, 0, 0, $totalwidth - 1, $totalheight - 1, $color['black']);
 104         imagerectangle ($img, 1, 1, $totalwidth - 2, $totalheight - 2, $color['gray']);
 105         imagerectangle ($img, 2, 2, $totalwidth - 3, $totalheight - 3, $color['black']);
 106         for ($unit_no = 1; $unit_no <= $rackData['height']; $unit_no++)
 107         {
 108                 for ($locidx = 0; $locidx < 3; $locidx++)
 109                 {
 110                         $colorcode = $rackData[$unit_no][$locidx]['state'];
 111                         if (isset ($rackData[$unit_no][$locidx]['hl']))
 112                                 $colorcode = $colorcode . $rackData[$unit_no][$locidx]['hl'];
 113                         imagerectangle
 114                         (
 115                                 $img,
 116                                 $offset[$locidx],
 117                                 3 + ($rackData['height'] - $unit_no) * 2,
 118                                 $offset[$locidx] + $rtwidth[$locidx] - 1,
 119                                 3 + ($rackData['height'] - $unit_no) * 2 + 1,
 120                                 $color[$colorcode]
 121                         );
 122                 }
 123         }
 124         imagepng ($img);
 125         imagedestroy ($img);
 126 }
 127
 128 function renderProgressBarImage ($done)
 129 {
 130         $img = @imagecreatetruecolor (100, 10);
 131         switch (isset ($_REQUEST['theme']) ? $_REQUEST['theme'] : 'rackspace')
 132         {
 133                 case 'sparenetwork':
 134                         $color['T'] = colorFromHex ($img, '808080');
 135                         $color['F'] = colorFromHex ($img, 'c0c0c0');
 136                         break;
 137                 case 'rackspace': // teal
 138                 default:
 139                         $color['T'] = colorFromHex ($img, getConfigVar ('color_T'));
 140                         $color['F'] = colorFromHex ($img, getConfigVar ('color_F'));
 141         }
 142         imagefilledrectangle ($img, 0, 0, $done, 10, $color['T']);
 143         imagefilledrectangle ($img, $done, 0, 100, 10, $color['F']);
 144         header("Content-type: image/png");
 145         imagepng ($img);
 146         imagedestroy ($img);
 147 }
 148
 149 function renderAccessDeniedImage ()
 150 {
 151         $img = @imagecreatetruecolor (1, 1);
 152         imagefilledrectangle ($img, 0, 0, 1, 1, colorFromHex ($img, '000000'));
 153         header("Content-type: image/png");
 154         imagepng ($img);
 155         imagedestroy ($img);
 156 }
 157
 158 function renderFilePreview ($file_id = 0)
 159 {
 160         $file = getFile ($file_id);
 161         $image = imagecreatefromstring ($file['contents']);
 162         $width = imagesx ($image);
 163         $height = imagesy ($image);
 164         if ($_REQUEST['img'] == 'preview' and ($width > getConfigVar ('PREVIEW_IMAGE_MAXPXS') or $height > getConfigVar ('PREVIEW_IMAGE_MAXPXS')))
 165         {
 166                 // TODO: cache thumbs for faster page generation
 167                 $ratio = getConfigVar ('PREVIEW_IMAGE_MAXPXS') / max ($width, $height);
 168                 $newwidth = $width * $ratio;
 169                 $newheight = $height * $ratio;
 170                 $resampled = imagecreatetruecolor ($newwidth, $newheight);
 171                 imagecopyresampled ($resampled, $image, 0, 0, 0, 0, $newwidth, $newheight, $width, $height);
 172                 imagedestroy ($image);
 173                 $image = $resampled;
 174                 unset ($resampled);
 175         }
 176         header("Content-type: image/png"); // don't announce content-length, it may have changed after resampling
 177         imagepng ($image);
 178         imagedestroy ($image);
 179 }
 180
 181 ?>