XOOPS 2.5.6  Final
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data.php
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1 <?php
2 
7 
8  public $browsable = true;
9  public $allowed_types = array(
10  // you better write validation code for other types if you
11  // decide to allow them
12  'image/jpeg' => true,
13  'image/gif' => true,
14  'image/png' => true,
15  );
16  // this is actually irrelevant since we only write out the path
17  // component
18  public $may_omit_host = true;
19 
20  public function doValidate(&$uri, $config, $context) {
21  $result = explode(',', $uri->path, 2);
22  $is_base64 = false;
23  $charset = null;
24  $content_type = null;
25  if (count($result) == 2) {
26  list($metadata, $data) = $result;
27  // do some legwork on the metadata
28  $metas = explode(';', $metadata);
29  while(!empty($metas)) {
30  $cur = array_shift($metas);
31  if ($cur == 'base64') {
32  $is_base64 = true;
33  break;
34  }
35  if (substr($cur, 0, 8) == 'charset=') {
36  // doesn't match if there are arbitrary spaces, but
37  // whatever dude
38  if ($charset !== null) continue; // garbage
39  $charset = substr($cur, 8); // not used
40  } else {
41  if ($content_type !== null) continue; // garbage
42  $content_type = $cur;
43  }
44  }
45  } else {
46  $data = $result[0];
47  }
48  if ($content_type !== null && empty($this->allowed_types[$content_type])) {
49  return false;
50  }
51  if ($charset !== null) {
52  // error; we don't allow plaintext stuff
53  $charset = null;
54  }
55  $data = rawurldecode($data);
56  if ($is_base64) {
57  $raw_data = base64_decode($data);
58  } else {
59  $raw_data = $data;
60  }
61  // XXX probably want to refactor this into a general mechanism
62  // for filtering arbitrary content types
63  $file = tempnam("/tmp", "");
64  file_put_contents($file, $raw_data);
65  if (function_exists('exif_imagetype')) {
66  $image_code = exif_imagetype($file);
67  } elseif (function_exists('getimagesize')) {
68  set_error_handler(array($this, 'muteErrorHandler'));
69  $info = getimagesize($file);
70  restore_error_handler();
71  if ($info == false) return false;
72  $image_code = $info[2];
73  } else {
74  trigger_error("could not find exif_imagetype or getimagesize functions", E_USER_ERROR);
75  }
76  $real_content_type = image_type_to_mime_type($image_code);
77  if ($real_content_type != $content_type) {
78  // we're nice guys; if the content type is something else we
79  // support, change it over
80  if (empty($this->allowed_types[$real_content_type])) return false;
81  $content_type = $real_content_type;
82  }
83  // ok, it's kosher, rewrite what we need
84  $uri->userinfo = null;
85  $uri->host = null;
86  $uri->port = null;
87  $uri->fragment = null;
88  $uri->query = null;
89  $uri->path = "$content_type;base64," . base64_encode($raw_data);
90  return true;
91  }
92 
93  public function muteErrorHandler($errno, $errstr) {}
94 
95 }
96