Friendica Communications Platform (please note that this is a clone of the repository at github, issues are handled there) https://friendi.ca
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<?php
namespace Friendica\Util;
use Friendica\Core\Cache;
use Friendica\Core\Logger;
use Friendica\Core\System;
use Friendica\DI;
use Imagick;
/**
* Image utilities
*/
class Images
{
/**
* Maps Mime types to Imagick formats
*
* @return array
*/
public static function getFormatsMap()
{
$m = [
'image/jpeg' => 'JPG',
'image/png' => 'PNG',
'image/gif' => 'GIF'
];
return $m;
}
/**
* Returns supported image mimetypes and corresponding file extensions
*
* @return array
*/
public static function supportedTypes()
{
$types = [
'image/jpeg' => 'jpg'
];
if (class_exists('Imagick')) {
// Imagick::queryFormats won't help us a lot there...
// At least, not yet, other parts of friendica uses this array
$types += [
'image/png' => 'png',
'image/gif' => 'gif'
];
} elseif (imagetypes() & IMG_PNG) {
$types += [
'image/png' => 'png'
];
}
return $types;
}
/**
* Guess image mimetype from filename or from Content-Type header
*
* @param string $filename Image filename
* @param boolean $fromcurl Check Content-Type header from curl request
* @param string $header passed headers to take into account
*
* @return string|null
* @throws \Exception
*/
public static function guessType($filename, $fromcurl = false, $header = '')
{
Logger::info('Image: guessType: ' . $filename . ($fromcurl ? ' from curl headers' : ''));
$type = null;
if ($fromcurl) {
$headers = [];
$h = explode("\n", $header);
foreach ($h as $l) {
$data = array_map("trim", explode(":", trim($l), 2));
if (count($data) > 1) {
list($k, $v) = $data;
$headers[$k] = $v;
}
}
if (array_key_exists('Content-Type', $headers)) {
$type = $headers['Content-Type'];
}
}
if (is_null($type)) {
// Guessing from extension? Isn't that... dangerous?
if (class_exists('Imagick') && file_exists($filename) && is_readable($filename)) {
/**
* Well, this not much better,
* but at least it comes from the data inside the image,
* we won't be tricked by a manipulated extension
*/
$image = new Imagick($filename);
$type = $image->getImageMimeType();
} else {
$ext = pathinfo($filename, PATHINFO_EXTENSION);
$types = self::supportedTypes();
$type = 'image/jpeg';
foreach ($types as $m => $e) {
if ($ext == $e) {
$type = $m;
}
}
}
}
Logger::info('Image: guessType: type=' . $type);
return $type;
}
/**
* @param string $url
* @return array
* @throws \Friendica\Network\HTTPException\InternalServerErrorException
*/
public static function getInfoFromURLCached($url)
{
$data = [];
if (empty($url)) {
return $data;
}
$data = Cache::get($url);
if (empty($data) || !is_array($data)) {
$data = self::getInfoFromURL($url);
Cache::set($url, $data);
}
return $data;
}
/**
* @param string $url
* @return array
* @throws \Friendica\Network\HTTPException\InternalServerErrorException
*/
public static function getInfoFromURL($url)
{
$data = [];
if (empty($url)) {
return $data;
}
$img_str = Network::fetchUrl($url, true, 4);
if (!$img_str) {
return [];
}
$filesize = strlen($img_str);
try {
if (function_exists("getimagesizefromstring")) {
$data = @getimagesizefromstring($img_str);
} else {
$tempfile = tempnam(get_temppath(), "cache");
$stamp1 = microtime(true);
file_put_contents($tempfile, $img_str);
DI::profiler()->saveTimestamp($stamp1, "file", System::callstack());
$data = getimagesize($tempfile);
unlink($tempfile);
}
} catch (\Exception $e) {
return [];
}
if ($data) {
$data['size'] = $filesize;
}
return $data;
}
/**
* @param integer $width
* @param integer $height
* @param integer $max
* @return array
*/
public static function getScalingDimensions($width, $height, $max)
{
if ((!$width) || (!$height)) {
return ['width' => 0, 'height' => 0];
}
if ($width > $max && $height > $max) {
// very tall image (greater than 16:9)
// constrain the width - let the height float.
if ((($height * 9) / 16) > $width) {
$dest_width = $max;
$dest_height = intval(($height * $max) / $width);
} elseif ($width > $height) {
// else constrain both dimensions
$dest_width = $max;
$dest_height = intval(($height * $max) / $width);
} else {
$dest_width = intval(($width * $max) / $height);
$dest_height = $max;
}
} else {
if ($width > $max) {
$dest_width = $max;
$dest_height = intval(($height * $max) / $width);
} else {
if ($height > $max) {
// very tall image (greater than 16:9)
// but width is OK - don't do anything
if ((($height * 9) / 16) > $width) {
$dest_width = $width;
$dest_height = $height;
} else {
$dest_width = intval(($width * $max) / $height);
$dest_height = $max;
}
} else {
$dest_width = $width;
$dest_height = $height;
}
}
}
return ['width' => $dest_width, 'height' => $dest_height];
}
}