code:
<?php
/**
 * StatusNet, the distributed open-source microblogging tool
 *
 * FIXME
 *
 * 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  Widget
 * @package   StatusNet
 * @author    Evan Prodromou <evan@status.net>
 * @copyright 2009 StatusNet, Inc.
 * @license   http://www.fsf.org/licensing/licenses/agpl-3.0.html GNU Affero General Public License version 3.0
 * @link      http://status.net/
 */

if (!defined('STATUSNET') && !defined('LACONICA')) {
    exit(1);
}

/**
 * FIXME
 *
 * These are the widgets that show interesting data about a person * group, or site.
 *
 * @category Widget
 * @package  StatusNet
 * @author   Evan Prodromou <evan@status.net>
 * @license  http://www.fsf.org/licensing/licenses/agpl-3.0.html GNU Affero General Public License version 3.0
 * @link     http://status.net/
 */
class AttachmentNoticeSection extends NoticeSection
{
    function showContent() {
        parent::showContent();
        return false;
    }

    function getNotices()
    {
        $notice = new Notice;

        $notice->joinAdd(array('id', 'file_to_post:post_id'));
        $notice->whereAdd(sprintf('file_to_post.file_id = %d', $this->out->attachment->id));

        $notice->orderBy('created desc');
        $notice->selectAdd('post_id as id');
        $notice->find();
        return $notice;
    }

    function title()
    {
        // TRANS: Title.
        return _('Notices where this attachment appears');
    }

    function divId()
    {
        return 'attachment_section';
    }
}


code:
<?php
/**
 * GNU social - a federating social network
 *
 * Abstraction for an image file
 *
 * 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   GNUsocial
 * @author    Evan Prodromou <evan@status.net>
 * @author    Zach Copley <zach@status.net>
 * @author    Mikael Nordfeldth <mmn@hethane.se>
 * @author    Miguel Dantas <biodantasgs@gmail.com>
 * @copyright 2008, 2019 Free Software Foundation http://fsf.org
 * @license   http://www.fsf.org/licensing/licenses/agpl-3.0.html GNU Affero General Public License version 3.0
 * @link      https://www.gnu.org/software/social/
 */

defined('GNUSOCIAL') || die();

use Intervention\Image\ImageManagerStatic as Image;

/**
 * A wrapper on uploaded images
 *
 * Makes it slightly easier to accept an image file from upload.
 *
 * @category Image
 * @package  GNUsocial
 * @license  http://www.fsf.org/licensing/licenses/agpl-3.0.html GNU Affero General Public License version 3.0
 * @author   Evan Prodromou <evan@status.net>
 * @author   Zach Copley <zach@status.net>
 * @link      https://www.gnu.org/software/social/
 */
class ImageFile extends MediaFile
{
    public $type;
    public $height;
    public $width;
    public $rotate   = 0;    // degrees to rotate for properly oriented image (extrapolated from EXIF etc.)
    public $animated = null; // Animated image? (has more than 1 frame). null means untested
    public $mimetype = null; // The _ImageFile_ mimetype, _not_ the originating File object

    public function __construct($id, string $filepath)
    {
        $old_limit = ini_set('memory_limit', common_config('attachments', 'memory_limit'));

        // 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);

        $img = Image::make($this->filepath);
        $this->mimetype = $img->mime();

        $cmp = function($obj, $type) {
            if ($obj->mimetype == image_type_to_mime_type($type)) {
                $obj->type = $type;
                return true;
            } else {
                return false;
            }
        };
        if (!(($cmp($this, IMAGETYPE_GIF)  && function_exists('imagecreatefromgif'))  ||
              ($cmp($this, IMAGETYPE_JPEG) && function_exists('imagecreatefromjpeg')) ||
              ($cmp($this, IMAGETYPE_BMP)  && function_exists('imagecreatefrombmp'))  ||
              ($cmp($this, IMAGETYPE_WBMP) && function_exists('imagecreatefromwbmp')) ||
              ($cmp($this, IMAGETYPE_XBM)  && function_exists('imagecreatefromxbm'))  ||
              ($cmp($this, IMAGETYPE_PNG)  && function_exists('imagecreatefrompng')))) {
            common_debug("Mimetype '{$this->mimetype}' was not recognized as a supported format");
            // TRANS: Exception thrown when trying to upload an unsupported image file format.
            throw new UnsupportedMediaException(_m('Unsupported image format.'), $this->filepath);
        }

        $this->width    = $img->width();
        $this->height   = $img->height();

        parent::__construct(
            $filepath,
            $this->mimetype,
            null /* filehash, MediaFile will calculate it */,
            $id
        );

        if ($this->type === IMAGETYPE_JPEG) {
            // Orientation value to rotate thumbnails properly
            $exif = @$img->exif();
            if (is_array($exif) && isset($exif['Orientation'])) {
                switch (intval($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));

        $img->destroy();
        ini_set('memory_limit', $old_limit); // Restore the old memory limit
    }

    /**
     * Create a thumbnail from a file object
     *
     * @return ImageFile
     */
    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) && !file_exists($imgPath)) {
                throw new FileNotFoundException($imgPath);
            }

            // First some mimetype specific exceptions
            switch ($file->mimetype) {
            case 'image/svg+xml':
                throw new UseFileAsThumbnailException($file);
            }

            // And we'll only consider it an image if it has such a media type
            if($media !== 'image') {
                throw new UnsupportedMediaException(_m('Unsupported media format.'), $file->getPath());
            } else if (!empty($file->filename)) {
                $imgPath = $file->getPath();
            }
        }

        if (!file_exists($imgPath)) {
            throw new FileNotFoundException($imgPath);
        }

        try {
            $image = new ImageFile($file->getID(), $imgPath);
        } catch (Exception $e) {
            // Avoid deleting the original
            try {
                if (strlen($imgPath) > 0 && $imgPath !== $file->getPath()) {
                    common_debug(__METHOD__.': Deleting temporary file that was created as image file' .
                                 'thumbnail source: '._ve($imgPath));
                    @unlink($imgPath);
                }
            } catch (FileNotFoundException $e) {
                // File reported (via getPath) that the original file
                // doesn't exist anyway, so it's safe to delete $imgPath
                @unlink($imgPath);
            }
            common_debug(sprintf(
                'Exception %s caught when creating ImageFile for File id==%s ' .
                                 'and imgPath==%s: %s',
                get_class($e),
                _ve($file->id),
                _ve($imgPath),
                _ve($e->getMessage())
            ));
            throw $e;
        }
        return $image;
    }

    public function getPath()
    {
        if (!file_exists($this->filepath)) {
            throw new FileNotFoundException($this->filepath);
        }

        return $this->filepath;
    }

    /**
     * Process a file upload
     *
     * Uses MediaFile's `fromUpload` to do the majority of the work and reencodes the image,
     * to mitigate injection attacks.
     * @param string $param
     * @param Profile|null $scoped
     * @return ImageFile|MediaFile
     * @throws ClientException
     * @throws NoResultException
     * @throws NoUploadedMediaException
     * @throws ServerException
     * @throws UnsupportedMediaException
     * @throws UseFileAsThumbnailException
     */
    public static function fromUpload(string $param='upload', Profile $scoped = null)
    {
        return parent::fromUpload($param, $scoped);
    }

    /**
     * Several obscure file types should be normalized to PNG on resize.
     *
     * Keeps only PNG, JPEG and GIF
     *
     * @return int
     */
    public function preferredType()
    {
        // Keep only JPEG and GIF in their orignal format
        if ($this->type === IMAGETYPE_JPEG || $this->type === IMAGETYPE_GIF) {
            return $this->type;
        }
        // We don't want to save some formats as they are rare, inefficient and antiquated
        // thus we can't guarantee clients will support
        // So just save it as PNG
        return IMAGETYPE_PNG;
    }

    /**
     * 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 $outpath
     * @return ImageFile the image stored at target path
     * @throws ClientException
     * @throws NoResultException
     * @throws ServerException
     * @throws UnsupportedMediaException
     * @throws UseFileAsThumbnailException
     */
    public function copyTo($outpath)
    {
        return new ImageFile(null, $this->resizeTo($outpath));
    }

    /**
     * Create and save a thumbnail image.
     *
     * @param string $outpath
     * @param array $box width, height, boundary box (x,y,w,h) defaults to full image
     * @return string full local filesystem filename
     * @throws UnsupportedMediaException
     * @throws UseFileAsThumbnailException
     */
    public function resizeTo($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($this->filepath)) {
            // TRANS: Exception thrown during resize when image has been registered as present,
            // but is no longer there.
            throw new FileNotFoundException($this->filepath);
        }

        // 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    === $this->preferredType()) {
            if (abs($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))) {
            $outpath = $this->resizeToFile($outpath, $box);
        }

        if (!file_exists($outpath)) {
            if ($this->fileRecord instanceof File) {
                throw new UseFileAsThumbnailException($this->fileRecord);
            } else {
                throw new UnsupportedMediaException('No local File object exists for ImageFile.');
            }
        }

        return $outpath;
    }

    /**
     * Resizes a file. If $box is omitted, the size is not changed, but this is still useful,
     * because it will reencode the image in the `self::prefferedType()` format. This only
     * applies henceforward, not retroactively
     *
     * Increases the 'memory_limit' to the one in the 'attachments' section in the config, to
     * enable the handling of bigger images, which can cause a peak of memory consumption, while
     * encoding
     * @param $outpath
     * @param array $box
     * @throws Exception
     */
    protected function resizeToFile(string $outpath, array $box) : string
    {
        $old_limit = ini_set('memory_limit', common_config('attachments', 'memory_limit'));

        try {
            $img = Image::make($this->filepath);
        } catch (Exception $e) {
            common_log(LOG_ERR, __METHOD__ . ' ecountered exception: ' . print_r($e, true));
            // TRANS: Exception thrown when trying to resize an unknown file type.
            throw new Exception(_m('Unknown file type'));
        }

        if ($this->filepath === $outpath) {
            @unlink($outpath);
        }

        if ($this->rotate != 0) {
            $img = $img->orientate();
        }

        $img->fit($box['width'], $box['height'],
                  function ($constraint) {
                      if (common_config('attachments', 'upscale') !== true) {
                          $constraint->upsize(); // Prevent upscaling
                      }
                  }
        );

        // Ensure we save in the correct format and allow customization based on type
        $type = $this->preferredType();
        switch ($type) {
        case IMAGETYPE_GIF:
            $img->save($outpath, 100, 'gif');
            break;
        case IMAGETYPE_PNG:
            $img->save($outpath, 100, 'png');
            break;
         case IMAGETYPE_JPEG:
             $img->save($outpath, common_config('image', 'jpegquality'), 'jpg');
            break;
         default:
            // TRANS: Exception thrown when trying resize an unknown file type.
            throw new Exception(_m('Unknown file type'));
        }

        $img->destroy();

        ini_set('memory_limit', $old_limit); // Restore the old memory limit

        return $outpath;
    }

    public function unlink()
    {
        @unlink($this->filepath);
    }

    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)
     * @param int $rotate
     * @return array
     * @throws ServerException
     */
    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; // number of animated frames apart from the original image
    }

    public function getFileThumbnail($width, $height, $crop, $upscale=false)
    {
        if (!$this->fileRecord instanceof File) {
            throw new ServerException('No File object attached to this ImageFile object.');
        }

        // Throws FileNotFoundException or FileNotStoredLocallyException
        $this->filepath = $this->fileRecord->getFileOrThumbnailPath();
        $filename = basename($this->filepath);

        if ($width === null) {
            $width  = common_config('thumbnail', 'width');
            $height = common_config('thumbnail', 'height');
            $crop   = common_config('thumbnail', 'crop');
        }

        if (!$upscale) {
            if ($width > $this->width) {
                $width = $this->width;
            }
            if (!is_null($height) && $height > $this->height) {
                $height = $this->height;
            }
        }

        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->getID(),
                                            'width'  => $width,
                                            'height' => $height,
                                         ));
        if ($thumb instanceof File_thumbnail) {
            return $thumb;
        }

        $type = $this->preferredType();
        $ext = image_type_to_extension($type, true);
        // Decoding returns null if the file is in the old format
        $filename = MediaFile::decodeFilename(basename($this->filepath));
        // Encoding null makes the file use 'untitled', and also replaces the extension
        $outfilename = MediaFile::encodeFilename($filename, $this->filehash, $ext);

        // The boundary box for our resizing
        $box = [
            'width'=>$width, 'height'=>$height,
            'x'=>$x,         'y'=>$y,
            'w'=>$w,         'h'=>$h
        ];

        $outpath = File_thumbnail::path(
            "thumb-{$this->fileRecord->id}-{$box['width']}x{$box['height']}-{$outfilename}");

        // 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->getID(),
            $width,
            $height
        ));

        // Perform resize and store into file
        $outpath = $this->resizeTo($outpath, $box);
        $outname = basename($outpath);

        return File_thumbnail::saveThumbnail(
            $this->fileRecord->getID(),
            // no url since we generated it ourselves and can dynamically
            // generate the url
            null,
            $width,
            $height,
            $outname
        );
    }
}

repo_name: suraj/sloth

license: mit


code:
<?php
/**
 * StatusNet, the distributed open-source microblogging tool
 *
 * widget for displaying notice attachments thumbnails
 *
 * 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  UI
 * @package   StatusNet
 * @author    Brion Vibber <brion@status.net>
 * @copyright 2010 StatusNet, Inc.
 * @license   http://www.fsf.org/licensing/licenses/agpl-3.0.html GNU Affero General Public License version 3.0
 * @link      http://status.net/
 */

if (!defined('GNUSOCIAL')) { exit(1); }

class InlineAttachmentList extends AttachmentList
{
    function showListStart()
    {
        $this->out->element('h4', 'attachments-title', _('Attachments'));
        parent::showListStart();
    }

    /**
     * returns a new list item for the current attachment
     *
     * @param File $notice the current attachment
     *
     * @return ListItem a list item for displaying the attachment
     */
    function newListItem(File $attachment)
    {
        return new InlineAttachmentListItem($attachment, $this->out);
    }
}


code:
<?php
/**
 * StatusNet, the distributed open-source microblogging tool
 *
 * widget for displaying notice attachments thumbnails
 *
 * 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  UI
 * @package   StatusNet
 * @author    Brion Vibber <brion@status.net>
 * @copyright 2010 StatusNet, Inc.
 * @license   http://www.fsf.org/licensing/licenses/agpl-3.0.html GNU Affero General Public License version 3.0
 * @link      http://status.net/
 */

if (!defined('GNUSOCIAL')) { exit(1); }

class InlineAttachmentListItem extends AttachmentListItem
{
    /**
     * start a single notice.
     *
     * @return void
     */
    function showStart()
    {
        // XXX: RDFa
        // TODO: add notice_type class e.g., notice_video, notice_image
        $this->out->elementStart('li',
                    array('class' => 'inline-attachment',
                          'id' => 'attachment-' . $this->attachment->getID(),
                ));
    }

    /**
     * finish the notice
     *
     * Close the last elements in the notice list item
     *
     * @return void
     */
    function showEnd()
    {
        $this->out->elementEnd('li');
    }
}


code:
<?php
/**
 * GNU social - a federating social network
 *
 * Abstraction for media files
 *
 * 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  Media
 * @package   GNUsocial
 * @author    Robin Millette <robin@millette.info>
 * @author    Miguel Dantas <biodantas@gmail.com>
 * @author    Zach Copley <zach@status.net>
 * @author    Mikael Nordfeldth <mmn@hethane.se>
 * @copyright 2008-2009, 2019 Free Software Foundation http://fsf.org
 * @license   http://www.fsf.org/licensing/licenses/agpl-3.0.html GNU Affero General Public License version 3.0
 * @link      https://www.gnu.org/software/social/
 */

defined('GNUSOCIAL') || die();

/**
 * Class responsible for abstracting media files
 */
class MediaFile
{
    public $id            = null;
    public $filepath      = null;
    public $filename      = null;
    public $fileRecord    = null;
    public $fileurl       = null;
    public $short_fileurl = null;
    public $mimetype      = null;

    /**
     * @param string $filepath The path of the file this media refers to. Required
     * @param string $mimetype The mimetype of the file. Required
     * @param $filehash        The hash of the file, if known. Optional
     * @param int|null $id     The DB id of the file. Int if known, null if not.
     *                         If null, it searches for it. If -1, it skips all DB
     *                         interactions (useful for temporary objects)
     * @throws ClientException
     * @throws NoResultException
     * @throws ServerException
     */
    public function __construct(string $filepath, string $mimetype, $filehash = null, $id = null)
    {
        $this->filepath = $filepath;
        $this->filename = basename($this->filepath);
        $this->mimetype = $mimetype;
        $this->filehash = self::getHashOfFile($this->filepath, $filehash);
        $this->id       = $id;

        // If id is -1, it means we're dealing with a temporary object and don't want to store it in the DB,
        // or add redirects
        if ($this->id !== -1) {
            if (!empty($this->id)) {
                // If we have an id, load it
                $this->fileRecord = new File();
                $this->fileRecord->id = $this->id;
                if (!$this->fileRecord->find(true)) {
                    // If we have set an ID, we need that ID to exist!
                    throw new NoResultException($this->fileRecord);
                }
            } else {
                // Otherwise, store it
                $this->fileRecord = $this->storeFile();
            }

            $this->fileurl = common_local_url(
                'attachment',
                array('attachment' => $this->fileRecord->id)
            );

            $this->short_fileurl = common_shorten_url($this->fileurl);
        }
    }

    public function attachToNotice(Notice $notice)
    {
        File_to_post::processNew($this->fileRecord, $notice);
    }

    public function getPath()
    {
        return File::path($this->filename);
    }

    public function shortUrl()
    {
        return $this->short_fileurl;
    }

    public function getEnclosure()
    {
        return $this->getFile()->getEnclosure();
    }

    public function delete()
    {
        @unlink($this->filepath);
    }

    public function getFile()
    {
        if (!$this->fileRecord instanceof File) {
            throw new ServerException('File record did not exist for MediaFile');
        }

        return $this->fileRecord;
    }

    /**
     * Calculate the hash of a file.
     *
     * This won't work for files >2GiB because PHP uses only 32bit.
     * @param string $filepath
     * @param string|null $filehash
     * @return string
     * @throws ServerException
     */
    public static function getHashOfFile(string $filepath, $filehash = null)
    {
        assert(!empty($filepath), __METHOD__ . ": filepath cannot be null");
        if ($filehash === null) {
            // Calculate if we have an older upload method somewhere (Qvitter) that
            // doesn't do this before calling new MediaFile on its local files...
            $filehash = hash_file(File::FILEHASH_ALG, $filepath);
            if ($filehash === false) {
                throw new ServerException('Could not read file for hashing');
            }
        }
        return $filehash;
    }

    /**
     * Retrieve or insert as a file in the DB
     *
     * @return object File
     * @throws ClientException
     * @throws ServerException
     */
    protected function storeFile()
    {
        try {
            $file = File::getByHash($this->filehash);
            // We're done here. Yes. Already. We assume sha256 won't collide on us anytime soon.
            return $file;
        } catch (NoResultException $e) {
            // Well, let's just continue below.
        }

        $fileurl = common_local_url('attachment_view', array('filehash' => $this->filehash));

        $file = new File;

        $file->filename = $this->filename;
        $file->urlhash  = File::hashurl($fileurl);
        $file->url      = $fileurl;
        $file->filehash = $this->filehash;
        $file->size     = filesize($this->filepath);
        if ($file->size === false) {
            throw new ServerException('Could not read file to get its size');
        }
        $file->date     = time();
        $file->mimetype = $this->mimetype;

        $file_id = $file->insert();

        if ($file_id===false) {
            common_log_db_error($file, "INSERT", __FILE__);
            // TRANS: Client exception thrown when a database error was thrown during a file upload operation.
            throw new ClientException(_m('There was a database error while saving your file. Please try again.'));
        }

        // Set file geometrical properties if available
        try {
            $image = ImageFile::fromFileObject($file);
            $orig = clone($file);
            $file->width = $image->width;
            $file->height = $image->height;
            $file->update($orig);

            // We have to cleanup after ImageFile, since it
            // may have generated a temporary file from a
            // video support plugin or something.
            // FIXME: Do this more automagically.
            if ($image->getPath() != $file->getPath()) {
                $image->unlink();
            }
        } catch (ServerException $e) {
            // We just couldn't make out an image from the file. This
            // does not have to be UnsupportedMediaException, as we can
            // also get ServerException from files not existing etc.
        }

        return $file;
    }

    /**
     * The maximum allowed file size, as a string
     */
    public static function maxFileSize()
    {
        $value = self::maxFileSizeInt();
        if ($value > 1024 * 1024) {
            $value = $value/(1024*1024);
            // TRANS: Number of megabytes. %d is the number.
            return sprintf(_m('%dMB', '%dMB', $value), $value);
        } elseif ($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);
        }
    }

    /**
     * The maximum allowed file size, as an int
     */
    public static function maxFileSizeInt() : int
    {
        return common_config('attachments', 'file_quota');
    }

    /**
     * Encodes a file name and a file hash in the new file format, which is used to avoid
     * having an extension in the file, removing trust in extensions, while keeping the original name
     * @throws ClientException
     */
    public static function encodeFilename($original_name, string $filehash, $ext = null) : string
    {
        if (empty($original_name)) {
            $original_name = _m('Untitled attachment');
        }

        // If we're given an extension explicitly, use it, otherwise...
        $ext = $ext ?:
             // get a replacement extension if configured, returns false if it's blocked,
             // null if no extension
             File::getSafeExtension($original_name);
        if ($ext === false) {
            throw new ClientException(_m('Blacklisted file extension.'));
        }

        if (!empty($ext)) {
            // Remove dots if we have them (make sure they're not repeated)
            $ext = preg_replace('/^\.+/', '', $ext);
            $original_name = preg_replace('/\.+.+$/i', ".{$ext}", $original_name);
        }

        $enc_name = bin2hex($original_name);
        return "{$enc_name}-{$filehash}";
    }

    /**
     * Decode the new filename format
     * @return false | null | string on failure, no match (old format) or original file name, respectively
     */
    public static function decodeFilename(string $encoded_filename)
    {
        // Should match:
        //   hex-hash
        //   thumb-id-widthxheight-hex-hash
        // And return the `hex` part
        $ret = preg_match('/^(.*-)?([^-]+)-[^-]+$/', $encoded_filename, $matches);
        if ($ret === false) {
            return false;
        } elseif ($ret === 0 || !ctype_xdigit($matches[2])) {
            return null; // No match
        } else {
            $filename = hex2bin($matches[2]);

            // Matches extension
            if (preg_match('/^(.+?)\.(.+)$/', $filename, $sub_matches) === 1) {
                $ext = $sub_matches[2];
                // Previously, there was a blacklisted extension array, which could have an alternative
                // extension, such as phps, to replace php. We want to turn it back (this is deprecated,
                // as it no longer makes sense, since we don't trust trust files based on extension,
                // but keep the feature)
                $blacklist = common_config('attachments', 'extblacklist');
                if (is_array($blacklist)) {
                    foreach ($blacklist as $upload_ext => $safe_ext) {
                        if ($ext === $safe_ext) {
                            $ext = $upload_ext;
                            break;
                        }
                    }
                }
                return "{$sub_matches[1]}.{$ext}";
            } else {
                // No extension, don't bother trying to replace it
                return $filename;
            }
        }
    }

    /**
     * Create a new MediaFile or ImageFile object from an upload
     *
     * Tries to set the mimetype correctly, using the most secure method available and rejects the file otherwise.
     * In case the upload is an image, this function returns an new ImageFile (which extends MediaFile)
     * The filename has a new format:
     *   bin2hex("{$original_name}.{$ext}")."-{$filehash}"
     * This format should be respected. Notice the dash, which is important to distinguish it from the previous
     * format ("{$hash}.{$ext}")
     *
     * @param string $param Form name
     * @param Profile|null $scoped
     * @return ImageFile|MediaFile
     * @throws ClientException
     * @throws NoResultException
     * @throws NoUploadedMediaException
     * @throws ServerException
     * @throws UnsupportedMediaException
     * @throws UseFileAsThumbnailException
     */
    public static function fromUpload(string $param='media', Profile $scoped=null)
    {
        // The existence of the "error" element means PHP has processed it properly even if it was ok.
        if (!(isset($_FILES[$param]) && isset($_FILES[$param]['error']))) {
            throw new NoUploadedMediaException($param);
        }

        switch ($_FILES[$param]['error']) {
            case UPLOAD_ERR_OK: // success, jump out
                break;
            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 ClientException(sprintf(
                    _m('That file is too big. The maximum file size is %s.'),
                    self::maxFileSize()
                ));
            case UPLOAD_ERR_PARTIAL:
                @unlink($_FILES[$param]['tmp_name']);
                // TRANS: Client exception.
                throw new ClientException(_m('The uploaded file was only partially uploaded.'));
            case UPLOAD_ERR_NO_FILE:
                // No file; probably just a non-AJAX submission.
                throw new NoUploadedMediaException($param);
            case UPLOAD_ERR_NO_TMP_DIR:
                // TRANS: Client exception thrown when a temporary folder is not present to store a file upload.
                throw new ClientException(_m('Missing a temporary folder.'));
            case UPLOAD_ERR_CANT_WRITE:
                // TRANS: Client exception thrown when writing to disk is not possible during a file upload operation.
                throw new ClientException(_m('Failed to write file to disk.'));
            case UPLOAD_ERR_EXTENSION:
                // TRANS: Client exception thrown when a file upload operation has been stopped by an extension.
                throw new ClientException(_m('File upload stopped by extension.'));
            default:
                common_log(LOG_ERR, __METHOD__ . ": Unknown upload error " . $_FILES[$param]['error']);
                // TRANS: Client exception thrown when a file upload operation has failed with an unknown reason.
                throw new ClientException(_m('System error uploading file.'));
        }

        $filehash = strtolower(self::getHashOfFile($_FILES[$param]['tmp_name']));

        try {
            $file = File::getByHash($filehash);
            // If no exception is thrown the file exists locally, so we'll use that and just add redirections.
            // but if the _actual_ locally stored file doesn't exist, getPath will throw FileNotFoundException
            $filepath = $file->getPath();
            $mimetype = $file->mimetype;
        } catch (FileNotFoundException | NoResultException $e) {
            // We have to save the upload as a new local file. This is the normal course of action.
            if ($scoped instanceof Profile) {
                // Throws exception if additional size does not respect quota
                // This test is only needed, of course, if we're uploading something new.
                File::respectsQuota($scoped, $_FILES[$param]['size']);
            }

            $mimetype = self::getUploadedMimeType($_FILES[$param]['tmp_name'], $_FILES[$param]['name']);
            $media = common_get_mime_media($mimetype);

            $basename = basename($_FILES[$param]['name']);

            if ($media == 'image') {
                // Use -1 for the id to avoid adding this temporary file to the DB
                $img = new ImageFile(-1, $_FILES[$param]['tmp_name']);
                // Validate the image by re-encoding it. Additionally normalizes old formats to PNG,
                // keeping JPEG and GIF untouched
                $outpath = $img->resizeTo($img->filepath);
                $ext = image_type_to_extension($img->preferredType(), false);
            }
            $filename = self::encodeFilename($basename, $filehash, isset($ext) ? $ext : File::getSafeExtension($basename));

            $filepath = File::path($filename);

            if ($media == 'image') {
                $result = rename($outpath, $filepath);
            } else {
                $result = move_uploaded_file($_FILES[$param]['tmp_name'], $filepath);
            }
            if (!$result) {
                // TRANS: Client exception thrown when a file upload operation fails because the file could
                // TRANS: not be moved from the temporary folder to the permanent file location.
                // UX: too specific
                throw new ClientException(_m('File could not be moved to destination directory.'));
            }

            if ($media == 'image') {
                return new ImageFile(null, $filepath);
            }
        }
        return new MediaFile($filepath, $mimetype, $filehash);
    }

    public static function fromFilehandle($fh, Profile $scoped=null)
    {
        $stream = stream_get_meta_data($fh);
        // So far we're only handling filehandles originating from tmpfile(),
        // so we can always do hash_file on $stream['uri'] as far as I can tell!
        $filehash = hash_file(File::FILEHASH_ALG, $stream['uri']);

        try {
            $file = File::getByHash($filehash);
            // Already have it, so let's reuse the locally stored File
            // by using getPath we also check whether the file exists
            // and throw a FileNotFoundException with the path if it doesn't.
            $filename = basename($file->getPath());
            $mimetype = $file->mimetype;
        } catch (FileNotFoundException $e) {
            // This happens if the file we have uploaded has disappeared
            // from the local filesystem for some reason. Since we got the
            // File object from a sha256 check in fromFilehandle, it's safe
            // to just copy the uploaded data to disk!

            fseek($fh, 0);  // just to be sure, go to the beginning
            // dump the contents of our filehandle to the path from our exception
            // and report error if it failed.
            if (false === file_put_contents($e->path, fread($fh, filesize($stream['uri'])))) {
                // TRANS: Client exception thrown when a file upload operation fails because the file could
                // TRANS: not be moved from the temporary folder to the permanent file location.
                throw new ClientException(_m('File could not be moved to destination directory.'));
            }
            if (!chmod($e->path, 0664)) {
                common_log(LOG_ERR, 'Could not chmod uploaded file: '._ve($e->path));
            }

            $filename = basename($file->getPath());
            $mimetype = $file->mimetype;
        } catch (NoResultException $e) {
            if ($scoped instanceof Profile) {
                File::respectsQuota($scoped, filesize($stream['uri']));
            }

            $mimetype = self::getUploadedMimeType($stream['uri']);

            $filename = strtolower($filehash) . '.' . File::guessMimeExtension($mimetype);
            $filepath = File::path($filename);

            $result = copy($stream['uri'], $filepath) && chmod($filepath, 0664);

            if (!$result) {
                common_log(LOG_ERR, 'File could not be moved (or chmodded) from '._ve($stream['uri']) . ' to ' . _ve($filepath));
                // TRANS: Client exception thrown when a file upload operation fails because the file could
                // TRANS: not be moved from the temporary folder to the permanent file location.
                throw new ClientException(_m('File could not be moved to destination directory.'));
            }
        }

        return new MediaFile($filename, $mimetype, $filehash);
    }

    /**
     * Attempt to identify the content type of a given file.
     *
     * @param string $filepath filesystem path as string (file must exist)
     * @param bool $originalFilename (optional) for extension-based detection
     * @return string
     *
     * @throws ClientException if type is known, but not supported for local uploads
     * @throws ServerException
     * @fixme this seems to tie a front-end error message in, kinda confusing
     *
     */
    public static function getUploadedMimeType(string $filepath, $originalFilename=false)
    {
        // We only accept filenames to existing files

        $mimetype = null;

        // From CodeIgniter
        // We'll need this to validate the MIME info string (e.g. text/plain; charset=us-ascii)
        $regexp = '/^([a-z\-]+\/[a-z0-9\-\.\+]+)(;\s[^\/]+)?$/';
        /**
         * Fileinfo extension - most reliable method
         *
         * Apparently XAMPP, CentOS, cPanel and who knows what
         * other PHP distribution channels EXPLICITLY DISABLE
         * ext/fileinfo, which is otherwise enabled by default
         * since PHP 5.3 ...
         */
        if (function_exists('finfo_file')) {
            $finfo = @finfo_open(FILEINFO_MIME);
            // It is possible that a FALSE value is returned, if there is no magic MIME database
            // file found on the system
            if (is_resource($finfo)) {
                $mime = @finfo_file($finfo, $filepath);
                finfo_close($finfo);
                /* According to the comments section of the PHP manual page,
                 * it is possible that this function returns an empty string
                 * for some files (e.g. if they don't exist in the magic MIME database)
                 */
                if (is_string($mime) && preg_match($regexp, $mime, $matches)) {
                    $mimetype = $matches[1];
                }
            }
        }
        /* This is an ugly hack, but UNIX-type systems provide a "native" way to detect the file type,
         * which is still more secure than depending on the value of $_FILES[$field]['type'], and as it
         * was reported in issue #750 (https://github.com/EllisLab/CodeIgniter/issues/750) - it's better
         * than mime_content_type() as well, hence the attempts to try calling the command line with
         * three different functions.
         *
         * Notes:
         *  - the DIRECTORY_SEPARATOR comparison ensures that we're not on a Windows system
         *  - many system admins would disable the exec(), shell_exec(), popen() and similar functions
         *    due to security concerns, hence the function_usable() checks
         */
        if (DIRECTORY_SEPARATOR !== '\\') {
            $cmd = 'file --brief --mime '.escapeshellarg($filepath).' 2>&1';
            if (empty($mimetype) && function_exists('exec')) {
                /* This might look confusing, as $mime is being populated with all of the output
                 * when set in the second parameter. However, we only need the last line, which is
                 * the actual return value of exec(), and as such - it overwrites anything that could
                 * already be set for $mime previously. This effectively makes the second parameter a
                 * dummy value, which is only put to allow us to get the return status code.
                 */
                $mime = @exec($cmd, $mime, $return_status);
                if ($return_status === 0 && is_string($mime) && preg_match($regexp, $mime, $matches)) {
                    $mimetype = $matches[1];
                }
            }
            if (empty($mimetype) && function_exists('shell_exec')) {
                $mime = @shell_exec($cmd);
                if (strlen($mime) > 0) {
                    $mime = explode("\n", trim($mime));
                    if (preg_match($regexp, $mime[(count($mime) - 1)], $matches)) {
                        $mimetype = $matches[1];
                    }
                }
            }
            if (empty($mimetype) && function_exists('popen')) {
                $proc = @popen($cmd, 'r');
                if (is_resource($proc)) {
                    $mime = @fread($proc, 512);
                    @pclose($proc);
                    if ($mime !== false) {
                        $mime = explode("\n", trim($mime));
                        if (preg_match($regexp, $mime[(count($mime) - 1)], $matches)) {
                            $mimetype = $matches[1];
                        }
                    }
                }
            }
        }
        // Fall back to mime_content_type(), if available (still better than $_FILES[$field]['type'])
        if (empty($mimetype) && function_exists('mime_content_type')) {
            $mimetype = @mime_content_type($filepath);
            // It's possible that mime_content_type() returns FALSE or an empty string
            if ($mimetype == false && strlen($mimetype) > 0) {
                throw new ServerException(_m('Could not determine file\'s MIME type.'));
            }
        }

        // Unclear types are such that we can't really tell by the auto
        // detect what they are (.bin, .exe etc. are just "octet-stream")
        $unclearTypes = array('application/octet-stream',
                              'application/vnd.ms-office',
                              'application/zip',
                              'text/plain',
                              'text/html',  // Ironically, Wikimedia Commons' SVG_logo.svg is identified as text/html
                              // TODO: for XML we could do better content-based sniffing too
                              'text/xml');

        $supported = common_config('attachments', 'supported');

        // If we didn't match, or it is an unclear match
        if ($originalFilename && (!$mimetype || in_array($mimetype, $unclearTypes))) {
            try {
                $type = common_supported_filename_to_mime($originalFilename);
                return $type;
            } catch (UnknownExtensionMimeException $e) {
                // FIXME: I think we should keep the file extension here (supported should be === true here)
            } catch (Exception $e) {
                // Extension parsed but no connected mimetype, so $mimetype is our best guess
            }
        }

        // If $config['attachments']['supported'] equals boolean true, accept any mimetype
        if ($supported === true || array_key_exists($mimetype, $supported)) {
            // FIXME: Don't know if it always has a mimetype here because
            // finfo->file CAN return false on error: http://php.net/finfo_file
            // so if $supported === true, this may return something unexpected.
            return $mimetype;
        }

        // We can conclude that we have failed to get the MIME type
        $media = common_get_mime_media($mimetype);
        if ('application' !== $media) {
            // TRANS: Client exception thrown trying to upload a forbidden MIME type.
            // TRANS: %1$s is the file type that was denied, %2$s is the application part of
            // TRANS: the MIME type that was denied.
            $hint = sprintf(_m('"%1$s" is not a supported file type on this server. ' .
            'Try using another %2$s format.'), $mimetype, $media);
        } else {
            // TRANS: Client exception thrown trying to upload a forbidden MIME type.
            // TRANS: %s is the file type that was denied.
            $hint = sprintf(_m('"%s" is not a supported file type on this server.'), $mimetype);
        }
        throw new ClientException($hint);
    }

    /**
     * Title for a file, to display in the interface (if there's no better title) and
     * for download filenames
     * @param $file File object
     * @returns string
     */
    public static function getDisplayName(File $file) : string {
        if (empty($file->filename)) {
            return _m('Untitled attachment');
        }

        // New file name format is "{bin2hex(original_name.ext)}-{$hash}"
        $filename = self::decodeFilename($file->filename);

        // If there was an error in the match, something's wrong with some piece
        // of code (could be a file with utf8 chars in the name)
        $log_error_msg = "Invalid file name for File with id={$file->id} " .
                       "({$file->filename}). Some plugin probably did something wrong.";
        if ($filename === false) {
            common_log(LOG_ERR, $log_error_msg);
        } elseif ($filename === null) {
            // The old file name format was "{hash}.{ext}" so we didn't have a name
            // This extracts the extension
            $ret = preg_match('/^.+?\.+?(.+)$/', $file->filename, $matches);
            if ($ret !== 1) {
                common_log(LOG_ERR, $log_error_msg);
                return _m('Untitled attachment');
            }
            $ext = $matches[1];
            // There's a blacklisted extension array, which could have an alternative
            // extension, such as phps, to replace php. We want to turn it back
            // (currently defaulted to empty, but let's keep the feature)
            $blacklist = common_config('attachments', 'extblacklist');
            if (is_array($blacklist)) {
                foreach ($blacklist as $upload_ext => $safe_ext) {
                    if ($ext === $safe_ext) {
                        $ext = $upload_ext;
                        break;
                    }
                }
            }
            $filename = "untitled.{$ext}";
        }
        return $filename;
    }
}


code:
<?php
// This file is part of GNU social - https://www.gnu.org/software/social
//
// GNU social 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.
//
// GNU social 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 GNU social.  If not, see <http://www.gnu.org/licenses/>.

/**
 * @package   GNUsocial
 * @author    Mikael Nordfeldth <mmn@hethane.se>
 * @copyright 2014 Free Software Foundation, Inc http://www.fsf.org
 * @license   https://www.gnu.org/licenses/agpl.html GNU AGPL v3 or later
 */

defined('GNUSOCIAL') || die();

/**
 * Superclass for plugins which add Activity types and such
 *
 * @category  Activity
 * @package   GNUsocial
 * @author    Mikael Nordfeldth <mmn@hethane.se>
 * @copyright 2014 Free Software Foundation, Inc http://www.fsf.org
 * @license   https://www.gnu.org/licenses/agpl.html GNU AGPL v3 or later
 */
abstract class ActivityHandlerModule extends Module
{
    /**
     * Returns a key string which represents this activity in HTML classes,
     * ids etc, as when offering selection of what type of post to make.
     * In MicroAppPlugin, this is paired with the user-visible localizable appTitle().
     *
     * @return string (compatible with HTML classes)
     */
    abstract public function tag();

    /**
     * Return a list of ActivityStreams object type IRIs
     * which this micro-app handles. Default implementations
     * of the base class will use this list to check if a
     * given ActivityStreams object belongs to us, via
     * $this->isMyNotice() or $this->isMyActivity.
     *
     * An empty list means any type is ok. (Favorite verb etc.)
     *
     * @return array of strings
     */
    abstract public function types();

    /**
     * Return a list of ActivityStreams verb IRIs which
     * this micro-app handles. Default implementations
     * of the base class will use this list to check if a
     * given ActivityStreams verb belongs to us, via
     * $this->isMyNotice() or $this->isMyActivity.
     *
     * All micro-app classes must override this method.
     *
     * @return array of strings
     */
    public function verbs()
    {
        return array(ActivityVerb::POST);
    }

    /**
     * Check if a given ActivityStreams activity should be handled by this
     * micro-app plugin.
     *
     * The default implementation checks against the activity type list
     * returned by $this->types(), and requires that exactly one matching
     * object be present. You can override this method to expand
     * your checks or to compare the activity's verb, etc.
     *
     * @param Activity $activity
     * @return boolean
     */
    public function isMyActivity(Activity $act)
    {
        return (count($act->objects) == 1
            && ($act->objects[0] instanceof ActivityObject)
            && $this->isMyVerb($act->verb)
            && $this->isMyType($act->objects[0]->type));
    }

    /**
     * Check if a given notice object should be handled by this micro-app
     * plugin.
     *
     * The default implementation checks against the activity type list
     * returned by $this->types(). You can override this method to expand
     * your checks, but follow the execution chain to get it right.
     *
     * @param Notice $notice
     * @return boolean
     */
    public function isMyNotice(Notice $notice)
    {
        return $this->isMyVerb($notice->verb) && $this->isMyType($notice->object_type);
    }

    public function isMyVerb($verb)
    {
        $verb = $verb ?: ActivityVerb::POST;    // post is the default verb
        return ActivityUtils::compareVerbs($verb, $this->verbs());
    }

    public function isMyType($type)
    {
        // Third argument to compareTypes is true, to allow for notices with empty object_type for example (verb-only)
        return count($this->types()) === 0 || ActivityUtils::compareTypes($type, $this->types());
    }

    /**
     * Given a parsed ActivityStreams activity, your plugin
     * gets to figure out how to actually save it into a notice
     * and any additional data structures you require.
     *
     * This function is deprecated and in the future, Notice::saveActivity
     * should be called from onStartHandleFeedEntryWithProfile in this class
     * (which instead turns to saveObjectFromActivity).
     *
     * @param Activity $activity
     * @param Profile $actor
     * @param array $options = []
     *
     * @return Notice the resulting notice
     */
    public function saveNoticeFromActivity(Activity $activity, Profile $actor, array $options = [])
    {
        // Any plugin which has not implemented saveObjectFromActivity _must_
        // override this function until they are migrated (this function will
        // be deleted when all plugins are migrated to saveObjectFromActivity).

        if (isset($this->oldSaveNew)) {
            throw new ServerException('A function has been called for new saveActivity functionality, but is still set with an oldSaveNew configuration');
        }

        return Notice::saveActivity($activity, $actor, $options);
    }

    /**
     * Given a parsed ActivityStreams activity, your plugin gets
     * to figure out itself how to store the additional data into
     * the database, besides the base data stored by the core.
     *
     * This will handle just about all events where an activity
     * object gets saved, whether it is via AtomPub, OStatus
     * (WebSub and Salmon transports), or ActivityStreams-based
     * backup/restore of account data.
     *
     * You should be able to accept as input the output from an
     * asActivity() call on the stored object. Where applicable,
     * try to use existing ActivityStreams structures and object
     * types, and be liberal in accepting input from what might
     * be other compatible apps.
     *
     * All micro-app classes must override this method.
     *
     * @fixme are there any standard options?
     *
     * @param Activity $activity
     * @param Notice $stored The notice in our database for this certain object
     * @param array $options = []
     *
     * @return object    If the verb handling plugin creates an object, it can be returned here (otherwise true)
     * @throws exception On any error.
     */
    protected function saveObjectFromActivity(Activity $activity, Notice $stored, array $options = [])
    {
        throw new ServerException('This function should be abstract when all plugins have migrated to saveObjectFromActivity');
    }

    /*
     * This usually gets called from Notice::saveActivity after a Notice object has been created,
     * so it contains a proper id and a uri for the object to be saved.
     */
    public function onStoreActivityObject(Activity $act, Notice $stored, array $options, &$object)
    {
        // $this->oldSaveNew is there during a migration period of plugins, to start using
        // Notice::saveActivity instead of Notice::saveNew
        if (!$this->isMyActivity($act) || isset($this->oldSaveNew)) {
            return true;
        }
        $object = $this->saveObjectFromActivity($act, $stored, $options);
        return false;
    }

    /**
     * Given an existing Notice object, your plugin gets to
     * figure out how to arrange it into an ActivityStreams
     * object.
     *
     * This will be how your specialized notice gets output in
     * Atom feeds and JSON-based ActivityStreams output, including
     * account backup/restore and OStatus (WebSub and Salmon transports).
     *
     * You should be able to round-trip data from this format back
     * through $this->saveNoticeFromActivity(). Where applicable, try
     * to use existing ActivityStreams structures and object types,
     * and consider interop with other compatible apps.
     *
     * All micro-app classes must override this method.
     *
     * @fixme this outputs an ActivityObject, not an Activity. Any compat issues?
     *
     * @param Notice $notice
     *
     * @return ActivityObject
     */
    abstract public function activityObjectFromNotice(Notice $notice);

    /**
     * When a notice is deleted, you'll be called here for a chance
     * to clean up any related resources.
     *
     * All micro-app classes must override this method.
     *
     * @param Notice $notice
     */
    abstract public function deleteRelated(Notice $notice);

    protected function notifyMentioned(Notice $stored, array &$mentioned_ids)
    {
        // pass through silently by default

        // If we want to stop any other plugin from notifying based on this activity, return false instead.
        return true;
    }

    /**
     * Called when generating Atom XML ActivityStreams output from an
     * ActivityObject belonging to this plugin. Gives the plugin
     * a chance to add custom output.
     *
     * Note that you can only add output of additional XML elements,
     * not change existing stuff here.
     *
     * If output is already handled by the base Activity classes,
     * you can leave this base implementation as a no-op.
     *
     * @param ActivityObject $obj
     * @param XMLOutputter $out to add elements at end of object
     */
    public function activityObjectOutputAtom(ActivityObject $obj, XMLOutputter $out)
    {
        // default is a no-op
    }

    /**
     * Called when generating JSON ActivityStreams output from an
     * ActivityObject belonging to this plugin. Gives the plugin
     * a chance to add custom output.
     *
     * Modify the array contents to your heart's content, and it'll
     * all get serialized out as JSON.
     *
     * If output is already handled by the base Activity classes,
     * you can leave this base implementation as a no-op.
     *
     * @param ActivityObject $obj
     * @param array &$out JSON-targeted array which can be modified
     */
    public function activityObjectOutputJson(ActivityObject $obj, array &$out)
    {
        // default is a no-op
    }

    /**
     * When a notice is deleted, delete the related objects
     * by calling the overridable $this->deleteRelated().
     *
     * @param Notice $notice Notice being deleted
     *
     * @return boolean hook value
     */
    public function onNoticeDeleteRelated(Notice $notice)
    {
        if ($this->isMyNotice($notice)) {
            try {
                $this->deleteRelated($notice);
            } catch (NoProfileException $e) {
                // we failed because of database lookup failure, Notice has no recognized profile as creator
                // so we skip this. If we want to remove missing notices we should do a SQL constraints check
                // in the affected plugin.
            } catch (AlreadyFulfilledException $e) {
                // Nothing to see here, it's obviously already gone...
            }
        }

        // Always continue this event in our activity handling plugins.
        return true;
    }

    /**
     * @param Notice $stored The notice being distributed
     * @param array  &$mentioned_ids List of profiles (from $stored->getReplies())
     */
    public function onStartNotifyMentioned(Notice $stored, array &$mentioned_ids)
    {
        if (!$this->isMyNotice($stored)) {
            return true;
        }

        return $this->notifyMentioned($stored, $mentioned_ids);
    }

    /**
     * Render a notice as one of our objects
     *
     * @param Notice $notice Notice to render
     * @param ActivityObject &$object Empty object to fill
     *
     * @return boolean hook value
     */
    public function onStartActivityObjectFromNotice(Notice $notice, &$object)
    {
        if (!$this->isMyNotice($notice)) {
            return true;
        }

        $object = $this->activityObjectFromNotice($notice);
        return false;
    }

    /**
     * Handle a posted object from WebSub
     *
     * @param Activity $activity activity to handle
     * @param Profile $actor Profile for the feed
     *
     * @return boolean hook value
     */
    public function onStartHandleFeedEntryWithProfile(Activity $activity, Profile $profile, &$notice)
    {
        if (!$this->isMyActivity($activity)) {
            return true;
        }

        // We are guaranteed to get a Profile back from checkAuthorship (or it throws an exception)
        $profile = ActivityUtils::checkAuthorship($activity, $profile);

        $object = $activity->objects[0];

        $options = [
            'uri'      => $object->id,
            'url'      => $object->link,
            'self'     => $object->selfLink,
            'is_local' => Notice::REMOTE,
            'source'   => 'ostatus',
        ];

        if (!isset($this->oldSaveNew)) {
            $notice = Notice::saveActivity($activity, $profile, $options);
        } else {
            $notice = $this->saveNoticeFromActivity($activity, $profile, $options);
        }

        return false;
    }

    /**
     * Handle a posted object from Salmon
     *
     * @param Activity $activity activity to handle
     * @param mixed $target user or group targeted
     *
     * @return boolean hook value
     */

    public function onStartHandleSalmonTarget(Activity $activity, $target)
    {
        if (!$this->isMyActivity($activity)) {
            return true;
        }
        if (!isset($this->oldSaveNew)) {
            // Handle saveActivity in OStatus class for incoming salmon, remove this event
            // handler when all plugins have gotten rid of "oldSaveNew".
            return true;
        }

        $this->log(LOG_INFO, get_called_class() . " checking {$activity->id} as a valid Salmon slap.");

        if ($target instanceof User_group || $target->isGroup()) {
            $uri = $target->getUri();
            if (!array_key_exists($uri, $activity->context->attention)) {
                // @todo FIXME: please document (i18n).
                // TRANS: Client exception thrown when ...
                throw new ClientException(_('Object not posted to this group.'));
            }
        } elseif ($target instanceof Profile && $target->isLocal()) {
            $original = null;
            // FIXME: Shouldn't favorites show up with a 'target' activityobject?
            if (!ActivityUtils::compareVerbs($activity->verb, array(ActivityVerb::POST)) && isset($activity->objects[0])) {
                // If this is not a post, it's a verb targeted at something (such as a Favorite attached to a note)
                if (!empty($activity->objects[0]->id)) {
                    $activity->context->replyToID = $activity->objects[0]->id;
                }
            }
            if (!empty($activity->context->replyToID)) {
                $original = Notice::getKV('uri', $activity->context->replyToID);
            }
            if ((!$original instanceof Notice || $original->profile_id != $target->id)
                && !array_key_exists($target->getUri(), $activity->context->attention)) {
                // @todo FIXME: Please document (i18n).
                // TRANS: Client exception when ...
                throw new ClientException(_('Object not posted to this user.'));
            }
        } else {
            // TRANS: Server exception thrown when a micro app plugin uses a target that cannot be handled.
            throw new ServerException(_('Do not know how to handle this kind of target.'));
        }

        $oactor = Ostatus_profile::ensureActivityObjectProfile($activity->actor);
        $actor = $oactor->localProfile();

        // FIXME: will this work in all cases? I made it work for Favorite...
        if (ActivityUtils::compareVerbs($activity->verb, array(ActivityVerb::POST))) {
            $object = $activity->objects[0];
        } else {
            $object = $activity;
        }

        $options = [
            'uri'      => $object->id,
            'url'      => $object->link,
            'self'     => $object->selfLink,
            'is_local' => Notice::REMOTE,
            'source'   => 'ostatus',
        ];

        $notice = $this->saveNoticeFromActivity($activity, $actor, $options);

        return false;
    }

    /**
     * Handle object posted via AtomPub
     *
     * @param Activity $activity Activity that was posted
     * @param Profile $scoped Profile of user posting
     * @param Notice   &$notice Resulting notice
     *
     * @return boolean hook value
     */
    public function onStartAtomPubNewActivity(Activity $activity, Profile $scoped, Notice &$notice = null)
    {
        if (!$this->isMyActivity($activity)) {
            return true;
        }

        $options = array('source' => 'atompub');

        $notice = $this->saveNoticeFromActivity($activity, $scoped, $options);

        return false;
    }

    /**
     * Handle object imported from a backup file
     *
     * @param User $user User to import for
     * @param ActivityObject $author Original author per import file
     * @param Activity $activity Activity to import
     * @param boolean $trusted Is this a trusted user?
     * @param boolean        &$done Is this done (success or unrecoverable error)
     *
     * @return boolean hook value
     */
    public function onStartImportActivity($user, $author, Activity $activity, $trusted, &$done)
    {
        if (!$this->isMyActivity($activity)) {
            return true;
        }

        $obj = $activity->objects[0];

        $options = [
            'uri'    => $object->id,
            'url'    => $object->link,
            'self'   => $object->selfLink,
            'source' => 'restore',
        ];

        // $user->getProfile() is a Profile
        $saved = $this->saveNoticeFromActivity(
            $activity,
            $user->getProfile(),
            $options
        );

        if (!empty($saved)) {
            $done = true;
        }

        return false;
    }

    /**
     * Event handler gives the plugin a chance to add custom
     * Atom XML ActivityStreams output from a previously filled-out
     * ActivityObject.
     *
     * The atomOutput method is called if it's one of
     * our matching types.
     *
     * @param ActivityObject $obj
     * @param XMLOutputter $out to add elements at end of object
     * @return boolean hook return value
     */
    public function onEndActivityObjectOutputAtom(ActivityObject $obj, XMLOutputter $out)
    {
        if (in_array($obj->type, $this->types())) {
            $this->activityObjectOutputAtom($obj, $out);
        }
        return true;
    }

    /**
     * Event handler gives the plugin a chance to add custom
     * JSON ActivityStreams output from a previously filled-out
     * ActivityObject.
     *
     * The activityObjectOutputJson method is called if it's one of
     * our matching types.
     *
     * @param ActivityObject $obj
     * @param array &$out JSON-targeted array which can be modified
     * @return boolean hook return value
     */
    public function onEndActivityObjectOutputJson(ActivityObject $obj, array &$out)
    {
        if (in_array($obj->type, $this->types())) {
            $this->activityObjectOutputJson($obj, $out);
        }
        return true;
    }

    public function onStartOpenNoticeListItemElement(NoticeListItem $nli)
    {
        if (!$this->isMyNotice($nli->notice)) {
            return true;
        }

        $this->openNoticeListItemElement($nli);

        Event::handle('EndOpenNoticeListItemElement', [$nli]);
        return false;
    }

    public function onStartCloseNoticeListItemElement(NoticeListItem $nli)
    {
        if (!$this->isMyNotice($nli->notice)) {
            return true;
        }

        $this->closeNoticeListItemElement($nli);

        Event::handle('EndCloseNoticeListItemElement', [$nli]);
        return false;
    }

    protected function openNoticeListItemElement(NoticeListItem $nli)
    {
        // Build up the attributes
        $attrs = [];

        // -> The id
        $id = (empty($nli->repeat)) ? $nli->notice->id : $nli->repeat->id;
        $id_decl = "notice-{$id}";
        $attrs['id'] = $id_decl;

        // -> The class
        $class = 'h-entry notice ' . $this->tag();
        if ($nli->notice->scope != 0 && $nli->notice->scope != 1) {
            $class .= ' limited-scope';
        }
        try {
            $class .= ' notice-source-' . common_to_alphanumeric($nli->notice->source);
        } catch (Exception $e) {
            // either source or what we filtered out was a zero-length string
        }
        $attrs['class'] = $class;

        // -> Robots
        if (!$nli->notice->isLocal()) {
            $attrs['data-nosnippet'] = 'true';
        }

        $nli->out->elementStart('li', $attrs);
    }

    protected function closeNoticeListItemElement(NoticeListItem $nli)
    {
        $nli->out->elementEnd('li');
    }

    // FIXME: This is overriden in MicroAppPlugin but shouldn't have to be
    public function onStartShowNoticeItem(NoticeListItem $nli)
    {
        if (!$this->isMyNotice($nli->notice)) {
            return true;
        }

        try {
            $this->showNoticeListItem($nli);
        } catch (Exception $e) {
            common_log(LOG_ERR, 'Error showing notice ' . $nli->getNotice()->getID() . ': ' . $e->getMessage());
            $nli->out->element('p', 'error', sprintf(_('Error showing notice: %s'), $e->getMessage()));
        }

        Event::handle('EndShowNoticeItem', array($nli));
        return false;
    }

    protected function showNoticeListItem(NoticeListItem $nli)
    {
        $nli->showNoticeHeaders();
        $nli->showContent();
        $nli->showNoticeFooter();
    }

    public function onStartShowNoticeItemNotice(NoticeListItem $nli)
    {
        if (!$this->isMyNotice($nli->notice)) {
            return true;
        }

        $this->showNoticeItemNotice($nli);

        Event::handle('EndShowNoticeItemNotice', array($nli));
        return false;
    }

    protected function showNoticeItemNotice(NoticeListItem $nli)
    {
        $nli->showNoticeTitle();
        $nli->showAuthor();
        $nli->showAddressees();
        $nli->showContent();
    }

    public function onStartShowNoticeContent(Notice $stored, HTMLOutputter $out, Profile $scoped = null)
    {
        if (!$this->isMyNotice($stored)) {
            return true;
        }

        try {
            $this->showNoticeContent($stored, $out, $scoped);
        } catch (Exception $e) {
            $out->element('div', 'error', $e->getMessage());
        }
        return false;
    }

    protected function showNoticeContent(Notice $stored, HTMLOutputter $out, Profile $scoped = null)
    {
        $out->text($stored->getContent());
    }
}