gnu-social/lib/imagefile.php

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<?php
/**
* StatusNet, the distributed open-source microblogging tool
*
* Abstraction for an image file
*
* PHP version 5
*
* LICENCE: 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 <http://www.gnu.org/licenses/>.
*
* @category Image
* @package StatusNet
* @author Evan Prodromou <evan@status.net>
* @author Zach Copley <zach@status.net>
* @copyright 2008-2009 StatusNet, Inc.
* @license http://www.fsf.org/licensing/licenses/agpl-3.0.html GNU Affero General Public License version 3.0
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* @link http://status.net/
*/
if (!defined('GNUSOCIAL')) { exit(1); }
/**
* A wrapper on uploaded files
*
* Makes it slightly easier to accept an image file from upload.
*
* @category Image
* @package StatusNet
* @author Evan Prodromou <evan@status.net>
* @author Zach Copley <zach@status.net>
* @license http://www.fsf.org/licensing/licenses/agpl-3.0.html GNU Affero General Public License version 3.0
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* @link http://status.net/
*/
class ImageFile
{
var $id;
var $filepath;
var $filename;
var $type;
var $height;
var $width;
var $rotate=0; // degrees to rotate for properly oriented image (extrapolated from EXIF etc.)
var $animated = null; // Animated image? (has more than 1 frame). null means untested
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var $mimetype = null; // The _ImageFile_ mimetype, _not_ the originating File object
protected $fileRecord = null;
function __construct($id, $filepath)
{
$this->id = $id;
if (!empty($this->id)) {
$this->fileRecord = new File();
$this->fileRecord->id = $this->id;
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if (!$this->fileRecord->find(true)) {
// If we have set an ID, we need that ID to exist!
throw new NoResultException($this->fileRecord);
}
}
// These do not have to be the same as fileRecord->filename for example,
// since we may have generated an image source file from something else!
$this->filepath = $filepath;
$this->filename = basename($filepath);
$info = @getimagesize($this->filepath);
if (!(
($info[2] == IMAGETYPE_GIF && function_exists('imagecreatefromgif')) ||
($info[2] == IMAGETYPE_JPEG && function_exists('imagecreatefromjpeg')) ||
$info[2] == IMAGETYPE_BMP ||
($info[2] == IMAGETYPE_WBMP && function_exists('imagecreatefromwbmp')) ||
($info[2] == IMAGETYPE_XBM && function_exists('imagecreatefromxbm')) ||
($info[2] == IMAGETYPE_PNG && function_exists('imagecreatefrompng')))) {
// TRANS: Exception thrown when trying to upload an unsupported image file format.
throw new UnsupportedMediaException(_('Unsupported image format.'), $this->filepath);
}
$this->width = $info[0];
$this->height = $info[1];
$this->type = $info[2];
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$this->mimetype = $info['mime'];
if ($this->type == IMAGETYPE_JPEG && function_exists('exif_read_data')) {
// Orientation value to rotate thumbnails properly
$exif = exif_read_data($this->filepath);
if (is_array($exif) && isset($exif['Orientation'])) {
switch ((int)$exif['Orientation']) {
case 1: // top is top
$this->rotate = 0;
break;
case 3: // top is bottom
$this->rotate = 180;
break;
case 6: // top is right
$this->rotate = -90;
break;
case 8: // top is left
$this->rotate = 90;
break;
}
// If we ever write this back, Orientation should be set to '1'
}
} elseif ($this->type === IMAGETYPE_GIF) {
$this->animated = $this->isAnimatedGif();
}
Event::handle('FillImageFileMetadata', array($this));
}
public static function fromFileObject(File $file)
{
$imgPath = null;
$media = common_get_mime_media($file->mimetype);
if (Event::handle('CreateFileImageThumbnailSource', array($file, &$imgPath, $media))) {
if (empty($file->filename)) {
throw new UnsupportedMediaException(_('File without filename could not get a thumbnail source.'));
}
// First some mimetype specific exceptions
switch ($file->mimetype) {
case 'image/svg+xml':
throw new UseFileAsThumbnailException($file->id);
}
// And we'll only consider it an image if it has such a media type
switch ($media) {
case 'image':
$imgPath = $file->getPath();
break;
default:
throw new UnsupportedMediaException(_('Unsupported media format.'), $file->getPath());
}
}
if (!file_exists($imgPath)) {
throw new ServerException(sprintf('Image not available locally: %s', $imgPath));
}
try {
$image = new ImageFile($file->id, $imgPath);
} catch (UnsupportedMediaException $e) {
// Avoid deleting the original
if ($imgPath != $file->getPath()) {
unlink($imgPath);
}
throw $e;
}
return $image;
}
public function getPath()
{
if (!file_exists($this->filepath)) {
throw new FileNotFoundException($this->filepath);
}
return $this->filepath;
}
static function fromUpload($param='upload')
{
switch ($_FILES[$param]['error']) {
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case UPLOAD_ERR_OK: // success, jump out
break;
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case UPLOAD_ERR_INI_SIZE:
case UPLOAD_ERR_FORM_SIZE:
// TRANS: Exception thrown when too large a file is uploaded.
// TRANS: %s is the maximum file size, for example "500b", "10kB" or "2MB".
throw new Exception(sprintf(_('That file is too big. The maximum file size is %s.'), ImageFile::maxFileSize()));
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case UPLOAD_ERR_PARTIAL:
@unlink($_FILES[$param]['tmp_name']);
// TRANS: Exception thrown when uploading an image and that action could not be completed.
throw new Exception(_('Partial upload.'));
case UPLOAD_ERR_NO_FILE:
// No file; probably just a non-AJAX submission.
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default:
common_log(LOG_ERR, __METHOD__ . ": Unknown upload error " . $_FILES[$param]['error']);
// TRANS: Exception thrown when uploading an image fails for an unknown reason.
throw new Exception(_('System error uploading file.'));
}
$info = @getimagesize($_FILES[$param]['tmp_name']);
if (!$info) {
@unlink($_FILES[$param]['tmp_name']);
// TRANS: Exception thrown when uploading a file as image that is not an image or is a corrupt file.
throw new UnsupportedMediaException(_('Not an image or corrupt file.'), '[deleted]');
}
return new ImageFile(null, $_FILES[$param]['tmp_name']);
}
/**
* Copy the image file to the given destination.
*
* This function may modify the resulting file. Please use the
* returned ImageFile object to read metadata (width, height etc.)
*
* @param string $outpath
* @return ImageFile the image stored at target path
*/
function copyTo($outpath)
{
return new ImageFile(null, $this->resizeTo($outpath));
}
/**
* Create and save a thumbnail image.
*
* @param string $outpath
* @param array $box width, height, boundary box (x,y,w,h) defaults to full image
* @return string full local filesystem filename
*/
function resizeTo($outpath, array $box=array())
{
$box['width'] = isset($box['width']) ? intval($box['width']) : $this->width;
$box['height'] = isset($box['height']) ? intval($box['height']) : $this->height;
$box['x'] = isset($box['x']) ? intval($box['x']) : 0;
$box['y'] = isset($box['y']) ? intval($box['y']) : 0;
$box['w'] = isset($box['w']) ? intval($box['w']) : $this->width;
$box['h'] = isset($box['h']) ? intval($box['h']) : $this->height;
if (!file_exists($this->filepath)) {
// TRANS: Exception thrown during resize when image has been registered as present, but is no longer there.
throw new Exception(_('Lost our file.'));
}
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// Don't rotate/crop/scale if it isn't necessary
if ($box['width'] === $this->width
&& $box['height'] === $this->height
&& $box['x'] === 0
&& $box['y'] === 0
&& $box['w'] === $this->width
&& $box['h'] === $this->height
&& $this->type == $this->preferredType()) {
if ($this->rotate == 0) {
// No rotational difference, just copy it as-is
@copy($this->filepath, $outpath);
return $outpath;
} elseif (abs($this->rotate) == 90) {
// Box is rotated 90 degrees in either direction,
// so we have to redefine x to y and vice versa.
$tmp = $box['width'];
$box['width'] = $box['height'];
$box['height'] = $tmp;
$tmp = $box['x'];
$box['x'] = $box['y'];
$box['y'] = $tmp;
$tmp = $box['w'];
$box['w'] = $box['h'];
$box['h'] = $tmp;
}
}
if (Event::handle('StartResizeImageFile', array($this, $outpath, $box))) {
$this->resizeToFile($outpath, $box);
}
if (!file_exists($outpath)) {
throw new UseFileAsThumbnailException($this->id);
}
return $outpath;
}
protected function resizeToFile($outpath, array $box)
{
switch ($this->type) {
case IMAGETYPE_GIF:
$image_src = imagecreatefromgif($this->filepath);
break;
case IMAGETYPE_JPEG:
$image_src = imagecreatefromjpeg($this->filepath);
break;
case IMAGETYPE_PNG:
$image_src = imagecreatefrompng($this->filepath);
break;
case IMAGETYPE_BMP:
$image_src = imagecreatefrombmp($this->filepath);
break;
case IMAGETYPE_WBMP:
$image_src = imagecreatefromwbmp($this->filepath);
break;
case IMAGETYPE_XBM:
$image_src = imagecreatefromxbm($this->filepath);
break;
default:
// TRANS: Exception thrown when trying to resize an unknown file type.
throw new Exception(_('Unknown file type'));
}
if ($this->rotate != 0) {
$image_src = imagerotate($image_src, $this->rotate, 0);
}
$image_dest = imagecreatetruecolor($box['width'], $box['height']);
if ($this->type == IMAGETYPE_GIF || $this->type == IMAGETYPE_PNG || $this->type == IMAGETYPE_BMP) {
$transparent_idx = imagecolortransparent($image_src);
if ($transparent_idx >= 0) {
$transparent_color = imagecolorsforindex($image_src, $transparent_idx);
$transparent_idx = imagecolorallocate($image_dest, $transparent_color['red'], $transparent_color['green'], $transparent_color['blue']);
imagefill($image_dest, 0, 0, $transparent_idx);
imagecolortransparent($image_dest, $transparent_idx);
} elseif ($this->type == IMAGETYPE_PNG) {
imagealphablending($image_dest, false);
$transparent = imagecolorallocatealpha($image_dest, 0, 0, 0, 127);
imagefill($image_dest, 0, 0, $transparent);
imagesavealpha($image_dest, true);
}
}
imagecopyresampled($image_dest, $image_src, 0, 0, $box['x'], $box['y'], $box['width'], $box['height'], $box['w'], $box['h']);
switch ($this->preferredType()) {
case IMAGETYPE_GIF:
imagegif($image_dest, $outpath);
break;
case IMAGETYPE_JPEG:
imagejpeg($image_dest, $outpath, common_config('image', 'jpegquality'));
break;
case IMAGETYPE_PNG:
imagepng($image_dest, $outpath);
break;
default:
// TRANS: Exception thrown when trying resize an unknown file type.
throw new Exception(_('Unknown file type'));
}
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imagedestroy($image_src);
imagedestroy($image_dest);
}
/**
* Several obscure file types should be normalized to PNG on resize.
*
* @fixme consider flattening anything not GIF or JPEG to PNG
* @return int
*/
function preferredType()
{
if($this->type == IMAGETYPE_BMP) {
//we don't want to save BMP... it's an inefficient, rare, antiquated format
//save png instead
return IMAGETYPE_PNG;
} else if($this->type == IMAGETYPE_WBMP) {
//we don't want to save WBMP... it's a rare format that we can't guarantee clients will support
//save png instead
return IMAGETYPE_PNG;
} else if($this->type == IMAGETYPE_XBM) {
//we don't want to save XBM... it's a rare format that we can't guarantee clients will support
//save png instead
return IMAGETYPE_PNG;
}
return $this->type;
}
function unlink()
{
@unlink($this->filepath);
}
static function maxFileSize()
{
$value = ImageFile::maxFileSizeInt();
if ($value > 1024 * 1024) {
$value = $value/(1024*1024);
// TRANS: Number of megabytes. %d is the number.
return sprintf(_m('%dMB','%dMB',$value),$value);
} else if ($value > 1024) {
$value = $value/1024;
// TRANS: Number of kilobytes. %d is the number.
return sprintf(_m('%dkB','%dkB',$value),$value);
} else {
// TRANS: Number of bytes. %d is the number.
return sprintf(_m('%dB','%dB',$value),$value);
}
}
static function maxFileSizeInt()
{
return min(ImageFile::strToInt(ini_get('post_max_size')),
ImageFile::strToInt(ini_get('upload_max_filesize')),
ImageFile::strToInt(ini_get('memory_limit')));
}
static function strToInt($str)
{
$unit = substr($str, -1);
$num = substr($str, 0, -1);
switch(strtoupper($unit)){
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case 'G':
$num *= 1024;
case 'M':
$num *= 1024;
case 'K':
$num *= 1024;
}
return $num;
}
public function scaleToFit($maxWidth=null, $maxHeight=null, $crop=null)
{
return self::getScalingValues($this->width, $this->height,
$maxWidth, $maxHeight, $crop, $this->rotate);
}
/*
* Gets scaling values for images of various types. Cropping can be enabled.
*
* Values will scale _up_ to fit max values if cropping is enabled!
* With cropping disabled, the max value of each axis will be respected.
*
* @param $width int Original width
* @param $height int Original height
* @param $maxW int Resulting max width
* @param $maxH int Resulting max height
* @param $crop int Crop to the size (not preserving aspect ratio)
*/
public static function getScalingValues($width, $height,
$maxW=null, $maxH=null,
$crop=null, $rotate=0)
{
$maxW = $maxW ?: common_config('thumbnail', 'width');
$maxH = $maxH ?: common_config('thumbnail', 'height');
if ($maxW < 1 || ($maxH !== null && $maxH < 1)) {
throw new ServerException('Bad parameters for ImageFile::getScalingValues');
} elseif ($maxH === null) {
// if maxH is null, we set maxH to equal maxW and enable crop
$maxH = $maxW;
$crop = true;
}
// Because GD doesn't understand EXIF orientation etc.
if (abs($rotate) == 90) {
$tmp = $width;
$width = $height;
$height = $tmp;
}
// Cropping data (for original image size). Default values, 0 and null,
// imply no cropping and with preserved aspect ratio (per axis).
$cx = 0; // crop x
$cy = 0; // crop y
$cw = null; // crop area width
$ch = null; // crop area height
if ($crop) {
$s_ar = $width / $height;
$t_ar = $maxW / $maxH;
$rw = $maxW;
$rh = $maxH;
// Source aspect ratio differs from target, recalculate crop points!
if ($s_ar > $t_ar) {
$cx = floor($width / 2 - $height * $t_ar / 2);
$cw = ceil($height * $t_ar);
} elseif ($s_ar < $t_ar) {
$cy = floor($height / 2 - $width / $t_ar / 2);
$ch = ceil($width / $t_ar);
}
} else {
$rw = $maxW;
$rh = ceil($height * $rw / $width);
// Scaling caused too large height, decrease to max accepted value
if ($rh > $maxH) {
$rh = $maxH;
$rw = ceil($width * $rh / $height);
}
}
return array(intval($rw), intval($rh),
intval($cx), intval($cy),
is_null($cw) ? $width : intval($cw),
is_null($ch) ? $height : intval($ch));
}
/**
* Animated GIF test, courtesy of frank at huddler dot com et al:
* http://php.net/manual/en/function.imagecreatefromgif.php#104473
* Modified so avoid landing inside of a header (and thus not matching our regexp).
*/
protected function isAnimatedGif()
{
if (!($fh = @fopen($this->filepath, 'rb'))) {
return false;
}
$count = 0;
//an animated gif contains multiple "frames", with each frame having a
//header made up of:
// * a static 4-byte sequence (\x00\x21\xF9\x04)
// * 4 variable bytes
// * a static 2-byte sequence (\x00\x2C)
// In total the header is maximum 10 bytes.
// We read through the file til we reach the end of the file, or we've found
// at least 2 frame headers
while(!feof($fh) && $count < 2) {
$chunk = fread($fh, 1024 * 100); //read 100kb at a time
$count += preg_match_all('#\x00\x21\xF9\x04.{4}\x00\x2C#s', $chunk, $matches);
// rewind in case we ended up in the middle of the header, but avoid
// infinite loop (i.e. don't rewind if we're already in the end).
if (!feof($fh) && ftell($fh) >= 9) {
fseek($fh, -9, SEEK_CUR);
}
}
fclose($fh);
return $count > 1;
}
public function getFileThumbnail($width, $height, $crop)
{
if (!$this->fileRecord instanceof File) {
throw new ServerException('No File object attached to this ImageFile object.');
}
if ($width === null) {
$width = common_config('thumbnail', 'width');
$height = common_config('thumbnail', 'height');
$crop = common_config('thumbnail', 'crop');
}
if ($height === null) {
$height = $width;
$crop = true;
}
// Get proper aspect ratio width and height before lookup
// We have to do it through an ImageFile object because of orientation etc.
// Only other solution would've been to rotate + rewrite uploaded files
// which we don't want to do because we like original, untouched data!
list($width, $height, $x, $y, $w, $h) = $this->scaleToFit($width, $height, $crop);
$thumb = File_thumbnail::pkeyGet(array(
'file_id'=> $this->fileRecord->id,
'width' => $width,
'height' => $height,
));
if ($thumb instanceof File_thumbnail) {
return $thumb;
}
$filename = $this->fileRecord->filehash ?: $this->filename; // Remote files don't have $this->filehash
$extension = File::guessMimeExtension($this->mimetype);
$outname = "thumb-{$this->fileRecord->id}-{$width}x{$height}-{$filename}." . $extension;
$outpath = File_thumbnail::path($outname);
// The boundary box for our resizing
$box = array('width'=>$width, 'height'=>$height,
'x'=>$x, 'y'=>$y,
'w'=>$w, 'h'=>$h);
// Doublecheck that parameters are sane and integers.
if ($box['width'] < 1 || $box['width'] > common_config('thumbnail', 'maxsize')
|| $box['height'] < 1 || $box['height'] > common_config('thumbnail', 'maxsize')
|| $box['w'] < 1 || $box['x'] >= $this->width
|| $box['h'] < 1 || $box['y'] >= $this->height) {
// Fail on bad width parameter. If this occurs, it's due to algorithm in ImageFile->scaleToFit
common_debug("Boundary box parameters for resize of {$this->filepath} : ".var_export($box,true));
throw new ServerException('Bad thumbnail size parameters.');
}
common_debug(sprintf('Generating a thumbnail of File id==%u of size %ux%u', $this->fileRecord->id, $width, $height));
// Perform resize and store into file
$this->resizeTo($outpath, $box);
// Avoid deleting the original
if ($this->getPath() != File_thumbnail::path($this->filename)) {
$this->unlink();
}
return File_thumbnail::saveThumbnail($this->fileRecord->id,
File_thumbnail::url($outname),
$width, $height,
$outname);
}
}
//PHP doesn't (as of 2/24/2010) have an imagecreatefrombmp so conditionally define one
if(!function_exists('imagecreatefrombmp')){
//taken shamelessly from http://www.php.net/manual/en/function.imagecreatefromwbmp.php#86214
function imagecreatefrombmp($p_sFile)
{
// Load the image into a string
$file = fopen($p_sFile,"rb");
$read = fread($file,10);
while(!feof($file)&&($read<>""))
$read .= fread($file,1024);
$temp = unpack("H*",$read);
$hex = $temp[1];
$header = substr($hex,0,108);
// Process the header
// Structure: http://www.fastgraph.com/help/bmp_header_format.html
if (substr($header,0,4)=="424d")
{
// Cut it in parts of 2 bytes
$header_parts = str_split($header,2);
// Get the width 4 bytes
$width = hexdec($header_parts[19].$header_parts[18]);
// Get the height 4 bytes
$height = hexdec($header_parts[23].$header_parts[22]);
// Unset the header params
unset($header_parts);
}
// Define starting X and Y
$x = 0;
$y = 1;
// Create newimage
$image = imagecreatetruecolor($width,$height);
// Grab the body from the image
$body = substr($hex,108);
// Calculate if padding at the end-line is needed
// Divided by two to keep overview.
// 1 byte = 2 HEX-chars
$body_size = (strlen($body)/2);
$header_size = ($width*$height);
// Use end-line padding? Only when needed
$usePadding = ($body_size>($header_size*3)+4);
// Using a for-loop with index-calculation instaid of str_split to avoid large memory consumption
// Calculate the next DWORD-position in the body
for ($i=0;$i<$body_size;$i+=3)
{
// Calculate line-ending and padding
if ($x>=$width)
{
// If padding needed, ignore image-padding
// Shift i to the ending of the current 32-bit-block
if ($usePadding)
$i += $width%4;
// Reset horizontal position
$x = 0;
// Raise the height-position (bottom-up)
$y++;
// Reached the image-height? Break the for-loop
if ($y>$height)
break;
}
// Calculation of the RGB-pixel (defined as BGR in image-data)
// Define $i_pos as absolute position in the body
$i_pos = $i*2;
$r = hexdec($body[$i_pos+4].$body[$i_pos+5]);
$g = hexdec($body[$i_pos+2].$body[$i_pos+3]);
$b = hexdec($body[$i_pos].$body[$i_pos+1]);
// Calculate and draw the pixel
$color = imagecolorallocate($image,$r,$g,$b);
imagesetpixel($image,$x,$height-$y,$color);
// Raise the horizontal position
$x++;
}
// Unset the body / free the memory
unset($body);
// Return image-object
return $image;
}
} // if(!function_exists('imagecreatefrombmp'))