silverstripe-framework/filesystem/Image.php
2016-06-29 10:02:32 +12:00

135 lines
4.1 KiB
PHP

<?php
/**
* Represents an Image
*
* @package framework
* @subpackage filesystem
*/
class Image extends File implements ShortcodeHandler {
public function __construct($record = null, $isSingleton = false, $model = null, $queryParams = array()) {
parent::__construct($record, $isSingleton, $model, $queryParams);
$this->File->setAllowedCategories('image/supported');
}
public function getCMSFields() {
$fields = parent::getCMSFields();
$fields->insertAfter(
'LastEdited',
new ReadonlyField("Dimensions", _t('AssetTableField.DIM','Dimensions') . ':')
);
return $fields;
}
public function getIsImage() {
return true;
}
/**
* Replace"[image id=n]" shortcode with an image reference.
* Permission checks will be enforced by the file routing itself.
*
* @param array $args Arguments passed to the parser
* @param string $content Raw shortcode
* @param ShortcodeParser $parser Parser
* @param string $shortcode Name of shortcode used to register this handler
* @param array $extra Extra arguments
* @return string Result of the handled shortcode
*/
public static function handle_shortcode($args, $content, $parser, $shortcode, $extra = array()) {
// Find appropriate record, with fallback for error handlers
$record = static::find_shortcode_record($args, $errorCode);
if($errorCode) {
$record = static::find_error_record($errorCode);
}
if (!$record) {
return null; // There were no suitable matches at all.
}
// Check if a resize is required
$src = $record->Link();
if($record instanceof Image) {
$width = isset($args['width']) ? $args['width'] : null;
$height = isset($args['height']) ? $args['height'] : null;
$hasCustomDimensions = ($width && $height);
if ($hasCustomDimensions && (($width != $record->getWidth()) || ($height != $record->getHeight()))) {
$resized = $record->ResizedImage($width, $height);
// Make sure that the resized image actually returns an image
if($resized) {
$src = $resized->getURL();
}
}
}
// Build the HTML tag
$attrs = array_merge(
// Set overrideable defaults
['src' => '', 'alt' => $record->Title],
// Use all other shortcode arguments
$args,
// But enforce some values
['id' => '', 'src' => $src]
);
// Clean out any empty attributes
$attrs = array_filter($attrs, function($v) {return (bool)$v;});
// Condense to HTML attribute string
$attrsStr = join(' ', array_map(function($name) use ($attrs) {
return Convert::raw2att($name) . '="' . Convert::raw2att($attrs[$name]) . '"';
}, array_keys($attrs)));
return '<img ' . $attrsStr . ' />';
}
/**
* Regenerates "[image id=n]" shortcode with new src attribute prior to being edited within the CMS.
*
* @param array $args Arguments passed to the parser
* @param string $content Raw shortcode
* @param ShortcodeParser $parser Parser
* @param string $shortcode Name of shortcode used to register this handler
* @param array $extra Extra arguments
* @return string Result of the handled shortcode
*/
public static function regenerate_shortcode($args, $content, $parser, $shortcode, $extra = array()) {
// Check if there is a suitable record
$record = static::find_shortcode_record($args);
if($record) {
$args['src'] = $record->getURL();
}
// Rebuild shortcode
$parts = array();
foreach($args as $name => $value) {
$htmlValue = Convert::raw2att($value ?: $name);
$parts[] = sprintf('%s="%s"', $name, $htmlValue);
}
return sprintf("[%s %s]", $shortcode, implode(' ', $parts));
}
/**
* Helper method to regenerate all shortcode links.
*
* @param string $value HTML value
* @return string value with links resampled
*/
public static function regenerate_html_links($value) {
// Create a shortcode generator which only regenerates links
$regenerator = ShortcodeParser::get('regenerator');
return $regenerator->parse($value);
}
public function PreviewLink($action = null) {
// Since AbsoluteLink can whitelist protected assets,
// do permission check first
if(!$this->canView()) {
return false;
}
$link = $this->AbsoluteLink();
$this->extend('updatePreviewLink', $link, $action);
return $link;
}
}