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https://we.phorge.it/source/phorge.git
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3cf9a5820f
Summary: Apply some autofix linter rules. Test Plan: `arc lint` and `arc unit` Reviewers: #blessed_reviewers, epriestley Reviewed By: #blessed_reviewers, epriestley Subscribers: epriestley, Korvin, hach-que Differential Revision: https://secure.phabricator.com/D10585
661 lines
17 KiB
PHP
661 lines
17 KiB
PHP
<?php
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/**
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* @task enormous Detecting Enormous Images
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* @task save Saving Image Data
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*/
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final class PhabricatorImageTransformer {
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public function executeMemeTransform(
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PhabricatorFile $file,
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$upper_text,
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$lower_text) {
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$image = $this->applyMemeToFile($file, $upper_text, $lower_text);
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return PhabricatorFile::newFromFileData(
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$image,
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array(
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'name' => 'meme-'.$file->getName(),
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'ttl' => time() + 60 * 60 * 24,
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'canCDN' => true,
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));
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}
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public function executeThumbTransform(
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PhabricatorFile $file,
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$x,
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$y) {
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$image = $this->crudelyScaleTo($file, $x, $y);
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return PhabricatorFile::newFromFileData(
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$image,
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array(
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'name' => 'thumb-'.$file->getName(),
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'canCDN' => true,
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));
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}
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public function executeProfileTransform(
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PhabricatorFile $file,
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$x,
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$min_y,
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$max_y) {
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$image = $this->crudelyCropTo($file, $x, $min_y, $max_y);
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return PhabricatorFile::newFromFileData(
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$image,
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array(
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'name' => 'profile-'.$file->getName(),
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'canCDN' => true,
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));
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}
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public function executePreviewTransform(
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PhabricatorFile $file,
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$size) {
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$image = $this->generatePreview($file, $size);
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return PhabricatorFile::newFromFileData(
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$image,
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array(
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'name' => 'preview-'.$file->getName(),
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'canCDN' => true,
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));
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}
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public function executeConpherenceTransform(
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PhabricatorFile $file,
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$top,
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$left,
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$width,
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$height) {
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$image = $this->crasslyCropTo(
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$file,
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$top,
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$left,
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$width,
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$height);
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return PhabricatorFile::newFromFileData(
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$image,
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array(
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'name' => 'conpherence-'.$file->getName(),
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'canCDN' => true,
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));
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}
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private function crudelyCropTo(PhabricatorFile $file, $x, $min_y, $max_y) {
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$data = $file->loadFileData();
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$img = imagecreatefromstring($data);
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$sx = imagesx($img);
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$sy = imagesy($img);
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$scaled_y = ($x / $sx) * $sy;
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if ($scaled_y > $max_y) {
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// This image is very tall and thin.
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$scaled_y = $max_y;
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} else if ($scaled_y < $min_y) {
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// This image is very short and wide.
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$scaled_y = $min_y;
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}
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$cropped = $this->applyScaleWithImagemagick($file, $x, $scaled_y);
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if ($cropped != null) {
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return $cropped;
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}
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$img = $this->applyScaleTo(
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$file,
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$x,
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$scaled_y);
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return self::saveImageDataInAnyFormat($img, $file->getMimeType());
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}
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private function crasslyCropTo(PhabricatorFile $file, $top, $left, $w, $h) {
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$data = $file->loadFileData();
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$src = imagecreatefromstring($data);
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$dst = $this->getBlankDestinationFile($w, $h);
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$scale = self::getScaleForCrop($file, $w, $h);
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$orig_x = $left / $scale;
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$orig_y = $top / $scale;
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$orig_w = $w / $scale;
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$orig_h = $h / $scale;
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imagecopyresampled(
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$dst,
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$src,
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0, 0,
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$orig_x, $orig_y,
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$w, $h,
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$orig_w, $orig_h);
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return self::saveImageDataInAnyFormat($dst, $file->getMimeType());
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}
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/**
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* Very crudely scale an image up or down to an exact size.
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*/
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private function crudelyScaleTo(PhabricatorFile $file, $dx, $dy) {
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$scaled = $this->applyScaleWithImagemagick($file, $dx, $dy);
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if ($scaled != null) {
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return $scaled;
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}
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$dst = $this->applyScaleTo($file, $dx, $dy);
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return self::saveImageDataInAnyFormat($dst, $file->getMimeType());
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}
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private function getBlankDestinationFile($dx, $dy) {
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$dst = imagecreatetruecolor($dx, $dy);
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imagesavealpha($dst, true);
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imagefill($dst, 0, 0, imagecolorallocatealpha($dst, 255, 255, 255, 127));
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return $dst;
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}
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private function applyScaleTo(PhabricatorFile $file, $dx, $dy) {
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$data = $file->loadFileData();
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$src = imagecreatefromstring($data);
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$x = imagesx($src);
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$y = imagesy($src);
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$scale = min(($dx / $x), ($dy / $y), 1);
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$sdx = $scale * $x;
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$sdy = $scale * $y;
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$dst = $this->getBlankDestinationFile($dx, $dy);
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imagesavealpha($dst, true);
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imagefill($dst, 0, 0, imagecolorallocatealpha($dst, 255, 255, 255, 127));
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imagecopyresampled(
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$dst,
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$src,
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($dx - $sdx) / 2, ($dy - $sdy) / 2,
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0, 0,
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$sdx, $sdy,
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$x, $y);
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return $dst;
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}
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public static function getPreviewDimensions(PhabricatorFile $file, $size) {
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$metadata = $file->getMetadata();
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$x = idx($metadata, PhabricatorFile::METADATA_IMAGE_WIDTH);
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$y = idx($metadata, PhabricatorFile::METADATA_IMAGE_HEIGHT);
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if (!$x || !$y) {
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$data = $file->loadFileData();
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$src = imagecreatefromstring($data);
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$x = imagesx($src);
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$y = imagesy($src);
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}
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$scale = min($size / $x, $size / $y, 1);
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$dx = max($size / 4, $scale * $x);
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$dy = max($size / 4, $scale * $y);
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$sdx = $scale * $x;
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$sdy = $scale * $y;
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return array(
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'x' => $x,
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'y' => $y,
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'dx' => $dx,
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'dy' => $dy,
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'sdx' => $sdx,
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'sdy' => $sdy,
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);
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}
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public static function getScaleForCrop(
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PhabricatorFile $file,
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$des_width,
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$des_height) {
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$metadata = $file->getMetadata();
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$width = $metadata[PhabricatorFile::METADATA_IMAGE_WIDTH];
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$height = $metadata[PhabricatorFile::METADATA_IMAGE_HEIGHT];
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if ($height < $des_height) {
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$scale = $height / $des_height;
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} else if ($width < $des_width) {
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$scale = $width / $des_width;
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} else {
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$scale_x = $des_width / $width;
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$scale_y = $des_height / $height;
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$scale = max($scale_x, $scale_y);
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}
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return $scale;
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}
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private function generatePreview(PhabricatorFile $file, $size) {
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$data = $file->loadFileData();
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$src = imagecreatefromstring($data);
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$dimensions = self::getPreviewDimensions($file, $size);
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$x = $dimensions['x'];
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$y = $dimensions['y'];
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$dx = $dimensions['dx'];
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$dy = $dimensions['dy'];
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$sdx = $dimensions['sdx'];
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$sdy = $dimensions['sdy'];
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$dst = $this->getBlankDestinationFile($dx, $dy);
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imagecopyresampled(
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$dst,
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$src,
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($dx - $sdx) / 2, ($dy - $sdy) / 2,
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0, 0,
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$sdx, $sdy,
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$x, $y);
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return self::saveImageDataInAnyFormat($dst, $file->getMimeType());
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}
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private function applyMemeToFile(
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PhabricatorFile $file,
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$upper_text,
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$lower_text) {
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$data = $file->loadFileData();
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$img_type = $file->getMimeType();
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$imagemagick = PhabricatorEnv::getEnvConfig('files.enable-imagemagick');
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if ($img_type != 'image/gif' || $imagemagick == false) {
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return $this->applyMemeTo(
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$data, $upper_text, $lower_text, $img_type);
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}
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$data = $file->loadFileData();
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$input = new TempFile();
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Filesystem::writeFile($input, $data);
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list($out) = execx('convert %s info:', $input);
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$split = phutil_split_lines($out);
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if (count($split) > 1) {
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return $this->applyMemeWithImagemagick(
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$input,
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$upper_text,
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$lower_text,
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count($split),
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$img_type);
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} else {
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return $this->applyMemeTo($data, $upper_text, $lower_text, $img_type);
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}
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}
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private function applyMemeTo(
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$data,
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$upper_text,
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$lower_text,
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$mime_type) {
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$img = imagecreatefromstring($data);
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// Some PNGs have color palettes, and allocating the dark border color
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// fails and gives us whatever's first in the color table. Copy the image
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// to a fresh truecolor canvas before working with it.
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$truecolor = imagecreatetruecolor(imagesx($img), imagesy($img));
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imagecopy($truecolor, $img, 0, 0, 0, 0, imagesx($img), imagesy($img));
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$img = $truecolor;
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$phabricator_root = dirname(phutil_get_library_root('phabricator'));
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$font_root = $phabricator_root.'/resources/font/';
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$font_path = $font_root.'tuffy.ttf';
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if (Filesystem::pathExists($font_root.'impact.ttf')) {
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$font_path = $font_root.'impact.ttf';
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}
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$text_color = imagecolorallocate($img, 255, 255, 255);
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$border_color = imagecolorallocatealpha($img, 0, 0, 0, 110);
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$border_width = 4;
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$font_max = 200;
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$font_min = 5;
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for ($i = $font_max; $i > $font_min; $i--) {
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$fit = $this->doesTextBoundingBoxFitInImage(
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$img,
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$upper_text,
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$i,
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$font_path);
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if ($fit['doesfit']) {
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$x = ($fit['imgwidth'] - $fit['txtwidth']) / 2;
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$y = $fit['txtheight'] + 10;
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$this->makeImageWithTextBorder($img,
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$i,
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$x,
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$y,
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$text_color,
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$border_color,
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$border_width,
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$font_path,
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$upper_text);
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break;
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}
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}
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for ($i = $font_max; $i > $font_min; $i--) {
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$fit = $this->doesTextBoundingBoxFitInImage($img,
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$lower_text, $i, $font_path);
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if ($fit['doesfit']) {
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$x = ($fit['imgwidth'] - $fit['txtwidth']) / 2;
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$y = $fit['imgheight'] - 10;
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$this->makeImageWithTextBorder(
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$img,
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$i,
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$x,
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$y,
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$text_color,
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$border_color,
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$border_width,
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$font_path,
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$lower_text);
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break;
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}
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}
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return self::saveImageDataInAnyFormat($img, $mime_type);
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}
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private function makeImageWithTextBorder($img, $font_size, $x, $y,
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$color, $stroke_color, $bw, $font, $text) {
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$angle = 0;
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$bw = abs($bw);
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for ($c1 = $x - $bw; $c1 <= $x + $bw; $c1++) {
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for ($c2 = $y - $bw; $c2 <= $y + $bw; $c2++) {
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if (!(($c1 == $x - $bw || $x + $bw) &&
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$c2 == $y - $bw || $c2 == $y + $bw)) {
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$bg = imagettftext($img, $font_size,
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$angle, $c1, $c2, $stroke_color, $font, $text);
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}
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}
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}
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imagettftext($img, $font_size, $angle,
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$x , $y, $color , $font, $text);
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}
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private function doesTextBoundingBoxFitInImage($img,
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$text, $font_size, $font_path) {
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// Default Angle = 0
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$angle = 0;
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$bbox = imagettfbbox($font_size, $angle, $font_path, $text);
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$text_height = abs($bbox[3] - $bbox[5]);
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$text_width = abs($bbox[0] - $bbox[2]);
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return array(
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'doesfit' => ($text_height * 1.05 <= imagesy($img) / 2
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&& $text_width * 1.05 <= imagesx($img)),
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'txtwidth' => $text_width,
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'txtheight' => $text_height,
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'imgwidth' => imagesx($img),
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'imgheight' => imagesy($img),
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);
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}
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private function applyScaleWithImagemagick(PhabricatorFile $file, $dx, $dy) {
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$img_type = $file->getMimeType();
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$imagemagick = PhabricatorEnv::getEnvConfig('files.enable-imagemagick');
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if ($img_type != 'image/gif' || $imagemagick == false) {
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return null;
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}
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$data = $file->loadFileData();
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$src = imagecreatefromstring($data);
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$x = imagesx($src);
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$y = imagesy($src);
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if (self::isEnormousGIF($x, $y)) {
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return null;
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}
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$scale = min(($dx / $x), ($dy / $y), 1);
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$sdx = $scale * $x;
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$sdy = $scale * $y;
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$input = new TempFile();
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Filesystem::writeFile($input, $data);
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$resized = new TempFile();
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$future = new ExecFuture(
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'convert %s -coalesce -resize %sX%s%s %s',
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$input,
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$sdx,
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$sdy,
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'!',
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$resized);
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// Don't spend more than 10 seconds resizing; just fail if it takes longer
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// than that.
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$future->setTimeout(10)->resolvex();
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return Filesystem::readFile($resized);
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}
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private function applyMemeWithImagemagick(
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$input,
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$above,
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$below,
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$count,
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$img_type) {
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$output = new TempFile();
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$future = new ExecFuture(
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'convert %s -coalesce +adjoin %s_%s',
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$input,
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$input,
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'%09d');
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$future->setTimeout(10)->resolvex();
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$output_files = array();
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for ($ii = 0; $ii < $count; $ii++) {
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$frame_name = sprintf('%s_%09d', $input, $ii);
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$output_name = sprintf('%s_%09d', $output, $ii);
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$output_files[] = $output_name;
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$frame_data = Filesystem::readFile($frame_name);
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$memed_frame_data = $this->applyMemeTo(
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$frame_data,
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$above,
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$below,
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$img_type);
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Filesystem::writeFile($output_name, $memed_frame_data);
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}
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$future = new ExecFuture('convert -loop 0 %Ls %s', $output_files, $output);
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$future->setTimeout(10)->resolvex();
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return Filesystem::readFile($output);
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}
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/* -( Detecting Enormous Files )------------------------------------------- */
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/**
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* Determine if an image is enormous (too large to transform).
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*
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* Attackers can perform a denial of service attack by uploading highly
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* compressible images with enormous dimensions but a very small filesize.
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* Transforming them (e.g., into thumbnails) may consume huge quantities of
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* memory and CPU relative to the resources required to transmit the file.
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*
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* In general, we respond to these images by declining to transform them, and
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* using a default thumbnail instead.
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*
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* @param int Width of the image, in pixels.
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* @param int Height of the image, in pixels.
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* @return bool True if this image is enormous (too large to transform).
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* @task enormous
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*/
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public static function isEnormousImage($x, $y) {
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// This is just a sanity check, but if we don't have valid dimensions we
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// shouldn't be trying to transform the file.
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if (($x <= 0) || ($y <= 0)) {
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return true;
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}
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return ($x * $y) > (4096 * 4096);
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}
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/**
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* Determine if a GIF is enormous (too large to transform).
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*
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* For discussion, see @{method:isEnormousImage}. We need to be more
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* careful about GIFs, because they can also have a large number of frames
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* despite having a very small filesize. We're more conservative about
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* calling GIFs enormous than about calling images in general enormous.
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*
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* @param int Width of the GIF, in pixels.
|
|
* @param int Height of the GIF, in pixels.
|
|
* @return bool True if this image is enormous (too large to transform).
|
|
* @task enormous
|
|
*/
|
|
public static function isEnormousGIF($x, $y) {
|
|
if (self::isEnormousImage($x, $y)) {
|
|
return true;
|
|
}
|
|
|
|
return ($x * $y) > (800 * 800);
|
|
}
|
|
|
|
|
|
/* -( Saving Image Data )-------------------------------------------------- */
|
|
|
|
|
|
/**
|
|
* Save an image resource to a string representation suitable for storage or
|
|
* transmission as an image file.
|
|
*
|
|
* Optionally, you can specify a preferred MIME type like `"image/png"`.
|
|
* Generally, you should specify the MIME type of the original file if you're
|
|
* applying file transformations. The MIME type may not be honored if
|
|
* Phabricator can not encode images in the given format (based on available
|
|
* extensions), but can save images in another format.
|
|
*
|
|
* @param resource GD image resource.
|
|
* @param string? Optionally, preferred mime type.
|
|
* @return string Bytes of an image file.
|
|
* @task save
|
|
*/
|
|
public static function saveImageDataInAnyFormat($data, $preferred_mime = '') {
|
|
$preferred = null;
|
|
switch ($preferred_mime) {
|
|
case 'image/gif':
|
|
$preferred = self::saveImageDataAsGIF($data);
|
|
break;
|
|
case 'image/png':
|
|
$preferred = self::saveImageDataAsPNG($data);
|
|
break;
|
|
}
|
|
|
|
if ($preferred !== null) {
|
|
return $preferred;
|
|
}
|
|
|
|
$data = self::saveImageDataAsJPG($data);
|
|
if ($data !== null) {
|
|
return $data;
|
|
}
|
|
|
|
$data = self::saveImageDataAsPNG($data);
|
|
if ($data !== null) {
|
|
return $data;
|
|
}
|
|
|
|
$data = self::saveImageDataAsGIF($data);
|
|
if ($data !== null) {
|
|
return $data;
|
|
}
|
|
|
|
throw new Exception(pht('Failed to save image data into any format.'));
|
|
}
|
|
|
|
|
|
/**
|
|
* Save an image in PNG format, returning the file data as a string.
|
|
*
|
|
* @param resource GD image resource.
|
|
* @return string|null PNG file as a string, or null on failure.
|
|
* @task save
|
|
*/
|
|
private static function saveImageDataAsPNG($image) {
|
|
if (!function_exists('imagepng')) {
|
|
return null;
|
|
}
|
|
|
|
ob_start();
|
|
$result = imagepng($image, null, 9);
|
|
$output = ob_get_clean();
|
|
|
|
if (!$result) {
|
|
return null;
|
|
}
|
|
|
|
return $output;
|
|
}
|
|
|
|
|
|
/**
|
|
* Save an image in GIF format, returning the file data as a string.
|
|
*
|
|
* @param resource GD image resource.
|
|
* @return string|null GIF file as a string, or null on failure.
|
|
* @task save
|
|
*/
|
|
private static function saveImageDataAsGIF($image) {
|
|
if (!function_exists('imagegif')) {
|
|
return null;
|
|
}
|
|
|
|
ob_start();
|
|
$result = imagegif($image);
|
|
$output = ob_get_clean();
|
|
|
|
if (!$result) {
|
|
return null;
|
|
}
|
|
|
|
return $output;
|
|
}
|
|
|
|
|
|
/**
|
|
* Save an image in JPG format, returning the file data as a string.
|
|
*
|
|
* @param resource GD image resource.
|
|
* @return string|null JPG file as a string, or null on failure.
|
|
* @task save
|
|
*/
|
|
private static function saveImageDataAsJPG($image) {
|
|
if (!function_exists('imagejpeg')) {
|
|
return null;
|
|
}
|
|
|
|
ob_start();
|
|
$result = imagejpeg($image);
|
|
$output = ob_get_clean();
|
|
|
|
if (!$result) {
|
|
return null;
|
|
}
|
|
|
|
return $output;
|
|
}
|
|
|
|
|
|
}
|