38ac387eac691a8dbd2177bf36a6bf7762100478
[racktables] / 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 ?>