friendica/src/Util/Images.php

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<?php
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/**
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* @copyright Copyright (C) 2010-2021, the Friendica project
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*
* @license GNU AGPL version 3 or any later version
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as
* published by the Free Software Foundation, either version 3 of the
* License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <https://www.gnu.org/licenses/>.
*
*/
namespace Friendica\Util;
use Friendica\Core\Logger;
use Friendica\Core\System;
use Friendica\DI;
/**
* 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;
}
/**
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* Fetch image mimetype from the image data or guessing from the file name
*
* @param string $image_data Image data
* @param string $filename File name (for guessing the type via the extension)
* @param string $mime default mime type
*
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* @return string
* @throws \Exception
*/
public static function getMimeTypeByData(string $image_data, string $filename = '', string $mime = '')
{
if (substr($mime, 0, 6) == 'image/') {
Logger::info('Using default mime type', ['filename' => $filename, 'mime' => $mime]);
return $mime;
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}
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$image = @getimagesizefromstring($image_data);
if (!empty($image['mime'])) {
Logger::info('Mime type detected via data', ['filename' => $filename, 'default' => $mime, 'mime' => $image['mime']]);
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return $image['mime'];
}
return self::guessTypeByExtension($filename);
}
/**
* Fetch image mimetype from the image data or guessing from the file name
*
* @param string $sourcefile Source file of the image
* @param string $filename File name (for guessing the type via the extension)
* @param string $mime default mime type
*
* @return string
* @throws \Exception
*/
public static function getMimeTypeBySource(string $sourcefile, string $filename = '', string $mime = '')
{
if (substr($mime, 0, 6) == 'image/') {
Logger::info('Using default mime type', ['filename' => $filename, 'mime' => $mime]);
return $mime;
}
$image = @getimagesize($sourcefile);
if (!empty($image['mime'])) {
Logger::info('Mime type detected via file', ['filename' => $filename, 'default' => $mime, 'image' => $image]);
return $image['mime'];
}
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return self::guessTypeByExtension($filename);
}
/**
* Guess image mimetype from the filename
*
* @param string $filename Image filename
*
* @return string
* @throws \Exception
*/
public static function guessTypeByExtension(string $filename)
{
$ext = pathinfo(parse_url($filename, PHP_URL_PATH), PATHINFO_EXTENSION);
$types = self::supportedTypes();
$type = 'image/jpeg';
foreach ($types as $m => $e) {
if ($ext == $e) {
$type = $m;
}
}
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Logger::info('Mime type guessed via extension', ['filename' => $filename, '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;
}
$data = DI::cache()->get($url);
if (empty($data) || !is_array($data)) {
$data = self::getInfoFromURL($url);
DI::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;
}
$img_str = DI::httpRequest()->fetch($url, 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");
$data = getimagesize($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];
}
}