예제 #1
0
/**
 *	clear the page's current background image
 *
 *	@param array $args arguments
 *		key 'page' is the page (i.e. page.rev)
 *	@return array response
 */
function page_clear_background_img($args)
{
    if (!isset($args['page'])) {
        return response('Required argument "page" missing', 400);
    }
    if (!page_exists($args['page'])) {
        return response('Page ' . quot($args['page']) . ' does not exist', 400);
    }
    load_modules('glue');
    $obj = load_object(array('name' => $args['page'] . '.page'));
    if ($obj['#error']) {
        // page object does not exist, hence no background image to clear
        return response(true);
    } else {
        $obj = $obj['#data'];
    }
    if (!empty($obj['page-background-file'])) {
        // delete file
        delete_upload(array('pagename' => array_shift(expl('.', $args['page'])), 'file' => $obj['page-background-file'], 'max_cnt' => 1));
        // and remove attributes
        return object_remove_attr(array('name' => $obj['name'], 'attr' => array('page-background-file', 'page-background-mime')));
    } else {
        return response(true);
    }
}
예제 #2
0
/**
 *	resize an image object
 *
 *	this function drops the reference to any currently resized version, 
 *	saves the resized image together with the original image in the page's 
 *	shared folder and updates the object file to use the resized version.
 *	@param array $args arguments
 *		key 'name' name of the objects
 *		key 'width' width in px
 *		key 'height' height in px
 *	@return array response
 *		true if the client is advised to reload the image, false if not
 */
function image_resize($args)
{
    // check for gd
    if (!_gd_available()) {
        return response('Host does not have gd', 500);
    }
    // set requested width & height
    if (($width = @intval($args['width'])) == 0) {
        return response('Required argument "width" is zero or does not exist', 400);
    }
    if (($height = @intval($args['height'])) == 0) {
        return response('Required argument "height" is zero or does not exist', 400);
    }
    load_modules('glue');
    // resolve symlinks
    $ret = object_get_symlink($args);
    if ($ret['#error']) {
        return $ret;
    } elseif ($ret['#data'] !== false) {
        log_msg('debug', 'image_resize: resolved object ' . quot($args['name']) . ' into ' . quot($ret['#data']));
        $args['name'] = $ret['#data'];
    }
    // load object
    $obj = load_object($args);
    if ($obj['#error']) {
        return $obj;
    } else {
        $obj = $obj['#data'];
    }
    if (@intval($obj['image-file-width']) == 0 || @intval($obj['image-file-height']) == 0) {
        return response('Original dimensions are not available', 500);
    }
    // set pagename
    $pn = array_shift(expl('.', $obj['name']));
    // resizing might not be necessary at all
    if (!empty($obj['image-resized-file']) && @intval($obj['image-resized-width']) == $width && @intval($obj['image-resized-height'] == $height)) {
        log_msg('debug', 'image_resize: width and height match the current resized file, no resize necessary');
        return response(false);
    }
    // else remove any currently resized file
    if (!empty($obj['image-resized-file'])) {
        log_msg('info', 'image_resize: dropping reference to previous resized file ' . quot($obj['image-resized-file']));
        delete_upload(array('pagename' => $pn, 'file' => $obj['image-resized-file'], 'max_cnt' => 1));
        unset($obj['image-resized-file']);
        unset($obj['image-resized-width']);
        unset($obj['image-resized-height']);
        // update object file as well
        $ret = object_remove_attr(array('name' => $obj['name'], 'attr' => array('image-resized-file', 'image-resized-width', 'image-resized-height')));
        if ($ret['#error']) {
            return $ret;
        }
        $was_resized = true;
    } else {
        $was_resized = false;
    }
    // check if width or height are larger than the original
    if (@intval($obj['image-file-width']) <= $width || @intval($obj['image-file-height']) <= $height) {
        log_msg('debug', 'image_resize: dimensions requested are larger or equal than the original file is, no resize necessary');
        // the client need not reload the the image if we were using the
        // original before
        if (!$was_resized) {
            return response(false);
        } else {
            return response(true);
        }
    }
    // check if we really have a source image
    if (empty($obj['image-file-mime']) && empty($obj['image-file'])) {
        return response(false);
    }
    // TODO (later): make this a generic function
    // load source file
    $ext = filext($obj['image-file']);
    $fn = CONTENT_DIR . '/' . $pn . '/shared/' . $obj['image-file'];
    if ($obj['image-file-mime'] == 'image/jpeg' || in_array($ext, array('jpg', 'jpeg'))) {
        $orig = @imagecreatefromjpeg($fn);
        $dest_ext = 'jpg';
    } elseif ($obj['image-file-mime'] == 'image/png' || $ext == 'png') {
        $orig = @imagecreatefrompng($fn);
        $dest_ext = 'png';
    } elseif (is_ani($fn)) {
        // animated images shall not be resized
        log_msg('debug', 'image_resize: animated image, not resizing');
        return response(true);
    } elseif ($obj['image-file-mime'] == 'image/gif' || $ext == 'gif') {
        $orig = @imagecreatefromgif($fn);
        // save gifs as png
        // TODO (later): check for animated gif (see php.net/manual/en/function.imagecreatefromgif.php)
        $dest_ext = 'png';
    } else {
        return response('Unsupported source file format ' . quot($obj['image-file']), 500);
    }
    if ($orig === false) {
        return response('Error loading source file ' . quot($obj['image-file']), 500);
    }
    // get source file dimensions
    $orig_size = @getimagesize($fn);
    // create resized image
    if (($resized = @imagecreatetruecolor($width, $height)) === false) {
        @imagedestroy($orig);
        return response('Error creating the resized image', 500);
    }
    // preserve any alpha channel
    @imagealphablending($resized, false);
    @imagesavealpha($resized, true);
    // try to resize
    if (!@imagecopyresampled($resized, $orig, 0, 0, 0, 0, $width, $height, $orig_size[0], $orig_size[1])) {
        @imagedestroy($resized);
        @imagedestroy($orig);
        return response('Error resizing the source image', 500);
    }
    // setup destination filename
    $a = expl('.', $obj['image-file']);
    if (1 < count($a)) {
        // throw the previous extension away
        $fn = CONTENT_DIR . '/' . $pn . '/shared/' . implode('.', array_slice($a, 0, -1)) . '-' . $width . 'x' . $height . '.' . $dest_ext;
    } else {
        $fn = CONTENT_DIR . '/' . $pn . '/shared/' . $a[0] . '-' . $width . 'x' . $height . '.' . $dest_ext;
    }
    $m = umask(0111);
    if ($dest_ext == 'jpg') {
        $ret = @imagejpeg($resized, $fn, IMAGE_JPEG_QUAL);
    } else {
        if ($dest_ext == 'png') {
            // preserve any alpha channel
            @imagealphablending($resized, false);
            @imagesavealpha($resized, true);
            $ret = @imagepng($resized, $fn, IMAGE_PNG_QUAL);
        }
    }
    umask($m);
    // destroy images again
    @imagedestroy($resized);
    @imagedestroy($orig);
    if (!$ret) {
        return response('Error saving the resized image', 500);
    } else {
        log_msg('info', 'image_resize: created a resized image of ' . quot($obj['name']) . ' -> ' . quot(basename($fn)));
    }
    // the code above can take a while, so read in the object anew via
    // update_object()
    $update = array();
    $update['name'] = $obj['name'];
    $update['image-resized-file'] = basename($fn);
    $update['image-resized-width'] = $width;
    $update['image-resized-height'] = $height;
    // we change width and height here as well since we are racing with the
    // save_object from the frontend after resize
    $update['object-width'] = $width . 'px';
    $update['object-height'] = $height . 'px';
    return update_object($update);
}