226 lines
9.2 KiB
PHP
226 lines
9.2 KiB
PHP
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<?php
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namespace Kirby\Plugins\ImageKit;
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use Response;
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use Thumb;
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use Str;
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/**
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* An extended version of Kirby’s thumb class which is able
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* to throw an error, if thumbs are resized with the
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* GD Library and PHP’s memory limit is exceeded or if
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* thumbnail creation failed for another reason.
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*/
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class ComplainingThumb extends Thumb {
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private static $_errorData = [];
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private static $_errorFormat = 'image';
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private static $_errorListening = false;
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private static $_creating = false;
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private static $_errorReporting;
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private static $_displayErrors;
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private static $_targetDimensions;
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private static $_sendError = false;
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private static $_reservedMemory;
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public static function setErrorFormat($format = null) {
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if (!is_null($format)) static::$_errorFormat = $format;
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static::$_errorFormat;
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}
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public static function enableSendError() {
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static::$_sendError = true;
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}
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public function create() {
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if(!static::$_sendError) {
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// Don’t setup a error handlers, if complaining is
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// not enabled and just return the result of create().
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return parent::create();
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}
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$this->prepareErrorHandler();
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$result = parent::create();
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$this->restoreErrorHandler();
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if(!file_exists($this->destination->root)) {
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$message = str::template('Thumbnail creation for "{file}" failed. Please ensure, that the thumbs directory is writable and your driver configuration is correct.', [
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'file' => static::$_errorData['file'],
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]);
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static::sendErrorResponse($message);
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exit;
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}
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return $result;
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}
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private function prepareErrorHandler() {
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// Reserve one additional megabyte of memory to make
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// catching of out-of-memory errors more reliable.
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// The variable’s content is deleted in the shutdown
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// function to have more available memory to prepare an
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// error.
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static::$_reservedMemory = str_repeat('#', 1024 * 1024);
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$dimensions = $this->source->dimensions();
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$filename = str_replace(kirby()->roots()->index() . DS, '', $this->source->root());
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$asset = new ProxyAsset($this->destination->root);
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$asset->options($this->options);
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$asset->original($this->source);
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$targetDimensions = $asset->dimensions();
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static::$_errorData = [
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'file' => $filename,
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'width' => $dimensions->width,
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'height' => $dimensions->height,
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'size' => $this->source->size(),
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'targetWidth' => $targetDimensions->width,
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'targetHeight' => $targetDimensions->height,
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];
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static::$_displayErrors = ini_get('display_errors');
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static::$_errorReporting = error_reporting();
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error_reporting(E_ALL);
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ini_set('display_errors', 0);
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if (!static::$_errorListening) {
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// As of PHP 7.0 there is not way of de-registering a
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// shutdown callback. So we only register it once at
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// the first time, this method is called.
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static::$_errorListening = true;
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register_shutdown_function([__CLASS__, 'shutdownCallback']);
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}
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static::$_creating = true;
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}
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private function restoreErrorHandler() {
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// Delete the reserved memory, because if thumbnail
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// creation succeeded, it is not needed any more.
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static::$_reservedMemory = null;
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ini_set('display_errors', static::$_displayErrors);
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error_reporting(static::$_errorReporting);
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static::$_creating = false;
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}
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public static function shutdownCallback() {
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// Delete the reserved memory to have more memory for
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// preparing an error message.
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static::$_reservedMemory = null;
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$error = error_get_last();
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if(!$error) return;
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if($error['type'] == E_ERROR || $error['type'] === E_WARNING) {
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if(str::contains($error['message'], 'Allowed Memory Size')) {
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$message = str::template('Thumbnail creation for "{file}" failed, because source image is probably too large ({width} × {height} pixels / {size}) To fix this issue, increase the memory limit of PHP or upload a smaller version of this image.', [
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'file' => static::$_errorData['file'],
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'width' => number_format(static::$_errorData['width']),
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'height' => number_format(static::$_errorData['height']),
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'size' => number_format(static::$_errorData['size'] / (1024 * 1024), 2) . " MB",
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]);
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static::sendErrorResponse($message);
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} else {
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static::sendErrorResponse($error['message']);
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}
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}
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}
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public static function sendErrorResponse($message = '') {
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// Make sure, that the error message is non-cachable
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header("Cache-Control: no-store, no-cache, must-revalidate, max-age=0");
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header("Cache-Control: post-check=0, pre-check=0", false);
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header("Pragma: no-cache");
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if(static::$_errorFormat === 'image') {
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// The returned error image is an SVG file, because it
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// can be created just by joined a couple of XML tags
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// together and is supported by every modern browser,
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// starting with IE 9 (which is of course not
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// modern any more …).
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header('Content-Type: image/svg+xml');
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// Although this is technically not correct, we have
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// to send status code 200, otherwise the image does
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// not show up in Firefox and Safari, although it
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// works with code 500 in Chrome and Edge. Also tested
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// in IE 10, IE 11
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http_response_code(200);
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$width = static::$_errorData['targetWidth'];
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$height = static::$_errorData['targetHeight'];
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// Return an SVG File with the thumb’s dimensions
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// Icon Credit: fontawesome.io
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?><svg version="1.1" xmlns="http://www.w3.org/2000/svg"
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xmlns:xlink="http://www.w3.org/1999/xlink"
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width="<?= $width ?>" height="<?= $height ?>"
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viewBox="0 0 <?= $width ?> <?= $height ?>"
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preserveAspectRatio="none">
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<symbol id="icon">
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<svg viewBox="0 0 48 44.52" width="48" height="44.52" preserveAspectRatio="xMinYMax meet">
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<path d="M27.425,36.789V31.705a0.854,0.854,0,0,0-.254-0.629,0.823,0.823,0,0,0-.6-0.254H21.431a0.823,0.823,0,0,0-.6.254,0.854,0.854,0,0,0-.254.629v5.084a0.854,0.854,0,0,0,.254.629,0.823,0.823,0,0,0,.6.254h5.137a0.823,0.823,0,0,0,.6-0.254A0.854,0.854,0,0,0,27.425,36.789ZM27.371,26.782L27.853,14.5a0.589,0.589,0,0,0-.268-0.508,1.034,1.034,0,0,0-.642-0.294H21.057a1.034,1.034,0,0,0-.642.294,0.64,0.64,0,0,0-.268.562L20.6,26.782a0.514,0.514,0,0,0,.268.441,1.152,1.152,0,0,0,.642.174h4.95a1.088,1.088,0,0,0,.629-0.174A0.6,0.6,0,0,0,27.371,26.782ZM27,1.793L47.545,39.464a3.192,3.192,0,0,1-.054,3.371,3.422,3.422,0,0,1-2.943,1.686H3.452A3.422,3.422,0,0,1,.509,42.835a3.192,3.192,0,0,1-.054-3.371L21,1.793A3.417,3.417,0,0,1,22.261.482a3.381,3.381,0,0,1,3.478,0A3.417,3.417,0,0,1,27,1.793Z" fill="#ffffff"/>
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</svg>
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</symbol>
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<rect width="100%" height="100%" fill="#F4999D" />
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<switch>
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<foreignObject width="100%" height="100%" requiredExtensions="http://www.w3.org/1999/xhtml">
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<body xmlns="http://www.w3.org/1999/xhtml" style="background:#F4999D;text-align:center;color:#fff;box-sizing:border-box;margin:0;padding:0;font-size:12px;font-family:-apple-system,BlinkMacSystemFont,'Segoe UI',Roboto,Oxygen,Ubuntu,Cantarell,'Open Sans','Helvetica Neue',sans-serif">
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<p style="margin:0;word-wrap:break-word;position:absolute;top:50%;transform:translateY(-50%);width: 100%;box-sizing:border-box;padding: 0 1em;">
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<svg viewBox="0 0 48 44.52" width="24" height="22.125" xmlns="http://www.w3.org/2000/svg" style="display: block; margin: 0 auto 12px;"><path d="M27.425,36.789V31.705a0.854,0.854,0,0,0-.254-0.629,0.823,0.823,0,0,0-.6-0.254H21.431a0.823,0.823,0,0,0-.6.254,0.854,0.854,0,0,0-.254.629v5.084a0.854,0.854,0,0,0,.254.629,0.823,0.823,0,0,0,.6.254h5.137a0.823,0.823,0,0,0,.6-0.254A0.854,0.854,0,0,0,27.425,36.789ZM27.371,26.782L27.853,14.5a0.589,0.589,0,0,0-.268-0.508,1.034,1.034,0,0,0-.642-0.294H21.057a1.034,1.034,0,0,0-.642.294,0.64,0.64,0,0,0-.268.562L20.6,26.782a0.514,0.514,0,0,0,.268.441,1.152,1.152,0,0,0,.642.174h4.95a1.088,1.088,0,0,0,.629-0.174A0.6,0.6,0,0,0,27.371,26.782ZM27,1.793L47.545,39.464a3.192,3.192,0,0,1-.054,3.371,3.422,3.422,0,0,1-2.943,1.686H3.452A3.422,3.422,0,0,1,.509,42.835a3.192,3.192,0,0,1-.054-3.371L21,1.793A3.417,3.417,0,0,1,22.261.482a3.381,3.381,0,0,1,3.478,0A3.417,3.417,0,0,1,27,1.793Z" fill="#ffffff"/></svg>
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<?= $message ?>
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</p>
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</body>
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</foreignObject>
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<!-- Fallback -->
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<use xlink:href="#icon" transform="translate(<?= number_format($width / 2 - 48 / 2,1,'.','') ?>, <?= number_format($height / 2 - 44.52 / 2,1,'.','') ?>)" />
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</switch>
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</svg><?php
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} else {
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// If error format has been set to JSON, return JSON ;-)
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header('Content-Type: application/json; charset=utf-8');
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http_response_code(500);
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echo json_encode([
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'status' => '',
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'code' => 500,
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'message' => $message,
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'data' => [
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'file' => static::$_errorData,
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],
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]);
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}
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exit;
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}
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}
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