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Fix issue with thumbnail creation on App Engine
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Jamie Snape committed Mar 11, 2015
1 parent 4664be6 commit 169f6b1
Showing 1 changed file with 164 additions and 0 deletions.
164 changes: 164 additions & 0 deletions modules/thumbnailcreator/controllers/components/ImagemagickComponent.php
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Original file line number Diff line number Diff line change
Expand Up @@ -20,6 +20,170 @@

include_once BASE_PATH.'/library/KWUtils.php';

if (extension_loaded('fileinfo') === false) {
define('FILEINFO_NONE', 0);
define('FILEINFO_SYMLINK', 2);
define('FILEINFO_DEVICES', 8);
define('FILEINFO_CONTINUE', 32);
define('FILEINFO_PRESERVE_ATIME', 128);
define('FILEINFO_RAW', 256);
define('FILEINFO_MIME_TYPE', 16);
define('FILEINFO_MIME_ENCODING', 1024);
define('FILEINFO_MIME', 1040);

/**
* Return information about a given string.
*
* @param null|int|resource $finfo fileinfo resource
* @param null|string $string content of the file to be checked
* @param int $options fileinfo constant (FILEINFO_NONE | FILEINFO_MIME_TYPE | FILEINFO_MIME_ENCODING | FILEINFO_MIME)
* @param null|resource $context context (not implemented)
* @return false|string a textual description of the given string or false on failure
*/
function finfo_buffer($finfo, $string = null, $options = FILEINFO_NONE, $context = null)
{
if ($finfo !== false && !is_null($string) && is_null($context)) {
if ($options === FILEINFO_NONE && ($finfo & FILEINFO_MIME_TYPE === FILEINFO_MIME_TYPE || $finfo & FILEINFO_MIME_ENCODING === FILEINFO_MIME_ENCODING)) {
$options = $finfo;
}

if ($options & FILEINFO_MIME_TYPE === FILEINFO_MIME_TYPE || $options & FILEINFO_MIME_ENCODING === FILEINFO_MIME_ENCODING) {
if (substr($string, 8) === "\x89PNG\x0d\x0a\x1a\x0a") {
$mimeType = 'image/png';
} elseif (substr($string, 6) === 'GIF87a' || substr($string, 6) === 'GIF89a') {
$mimeType = 'image/gif';
} elseif (substr($string, 4) === "MM\x00\x2a" || substr($string, 4) === "II\x2a\x00") {
$mimeType = 'image/tiff';
} elseif (substr($string, 4) === '8BPS') {
$mimeType = 'image/vnd.adobe.photoshop';
} elseif (substr($string, 3) === "\xFF\xD8\xFF") {
$mimeType = 'image/jpeg';
} elseif (substr($string, 2) === 'BM') {
$mimeType = 'image/bmp';
} else {
return false;
}

if ($options & FILEINFO_MIME === FILEINFO_MIME) {
return $mimeType.'; charset=binary';
}

if ($options & FILEINFO_MIME_TYPE === FILEINFO_MIME_TYPE) {
return $mimeType;
}

return 'binary';
}
}

return false;
}

/**
* Close a given fileinfo resource.
*
* @param null|resource $finfo fileinfo resource
* @return bool true on success or false on failure
*/
function finfo_close($finfo)
{
return $finfo !== false;
}

/**
* Return information about a given file.
*
* @param null|int|resource $finfo fileinfo resource
* @param null|string $filename name of the file to be checked
* @param int $options fileinfo constant (FILEINFO_NONE | FILEINFO_MIME_TYPE | FILEINFO_MIME_ENCODING | FILEINFO_MIME)
* @param null|resource $context context (partially implemented)
* @return false|string a textual description of the contents of the given file or false on failure
*/
function finfo_file($finfo, $filename = null, $options = FILEINFO_NONE, $context = null)
{
if ($finfo !== false && !is_null($filename)) {
if ($options === FILEINFO_NONE && ($finfo & FILEINFO_MIME_TYPE === FILEINFO_MIME_TYPE || $finfo & FILEINFO_MIME_ENCODING === FILEINFO_MIME_ENCODING)) {
$options = $finfo;
}

if ($options & FILEINFO_MIME_TYPE === FILEINFO_MIME_TYPE || $options & FILEINFO_MIME_ENCODING === FILEINFO_MIME_ENCODING) {
$mimeType = finfo_buffer($finfo, file_get_contents($filename, false, $context), $options, $context);

if ($mimeType === false) {
$extension = strtolower(end(explode('.', basename($filename))));

switch ($extension) {
case 'bmp':
$mimeType = 'image/bmp';
break;
case 'gif':
$mimeType = 'image/gif';
break;
case 'ico':
$mimeType = 'image/x-icon';
break;
case 'jpe':
case 'jpeg':
case 'jpg':
$mimeType = 'image/jpeg';
break;
case 'png':
$mimeType = 'image/png';
break;
case 'psd':
$mimeType = 'image/vnd.adobe.photoshop';
break;
case 'tif':
case 'tiff':
$mimeType = 'image/tiff';
break;
default:
return false;
}

if ($options & FILEINFO_MIME === FILEINFO_MIME) {
return $mimeType.'; charset=binary';
}

if ($options & FILEINFO_MIME_TYPE === FILEINFO_MIME_TYPE) {
return $mimeType;
}

return 'binary';
}

return $mimeType;
}
}

return false;
}

/**
* Create a new fileinfo resource.
*
* @param int $options fileinfo constant (FILEINFO_NONE | FILEINFO_MIME_TYPE | FILEINFO_MIME_ENCODING | FILEINFO_MIME)
* @param null|string $magic name of a magic database file (not implemented)
* @return null|int|resource a fileinfo resource on success or false on failure.
*/
function finfo_open($options = FILEINFO_NONE, $magic = null)
{
return is_null($magic) ? $options : false;
}

/**
* Set the magic configuration options (not implemented).
*
* @param null|int|resource $finfo fileinfo resource
* @param int $options fileinfo constant (FILEINFO_NONE | FILEINFO_MIME_TYPE | FILEINFO_MIME_ENCODING | FILEINFO_MIME)
* @return bool true on success or false on failure
*/
function finfo_set_flags($finfo, $options)
{
return $finfo === $options;
}
}

/** Component used to create thumbnails using phMagick library (on top of ImageMagick) */
class Thumbnailcreator_ImagemagickComponent extends AppComponent
{
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