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Improved Mime Type detection

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Michael 2020-04-01 05:42:44 +00:00
parent 248a7fa48a
commit d3722c945b
9 changed files with 89 additions and 102 deletions
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107
src/Util/Images.php
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@ -24,7 +24,6 @@ namespace Friendica\Util;
use Friendica\Core\Logger;
use Friendica\Core\System;
use Friendica\DI;
use Imagick;
/**
* Image utilities
@ -74,61 +73,79 @@ class Images
}
/**
* Guess image mimetype from filename or from Content-Type header
* Fetch image mimetype from the image data or guessing from the file name
*
* @param string $filename Image filename
* @param boolean $fromcurl Check Content-Type header from curl request
* @param string $header passed headers to take into account
* @param string $image_data Image data
* @param string $filename File name (for guessing the type via the extension)
* @param string $mime default mime type
*
* @return string|null
* @return string
* @throws \Exception
*/
public static function guessType($filename, $fromcurl = false, $header = '')
public static function getMimeTypeByData(string $image_data, string $filename = '', string $mime = '')
{
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 = $headers['Content-Type'];
}
if (substr($mime, 0, 6) == 'image/') {
Logger::info('Using default mime type', ['filename' => $filename, 'mime' => $mime]);
return $mime;
}
if (is_null($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;
}
}
}
$image = @getimagesizefromstring($image_data);
if (!empty($image['mime'])) {
Logger::info('Mime type detected via data', ['filename' => $filename, 'default' => $mime, 'mime' => $image['mime']]);
return $image['mime'];
}
Logger::info('Image: guessType: type=' . $type);
return $type;
return self::guessTypeByExtension($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 $image['mime'];
}
return self::guessTypeByExtension($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;
}
}
Logger::info('Mime type guessed via extension', ['filename' => $filename, 'type' => $type]);
return $type;
}
/**
* @param string $url