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<?php
/*
* This file belongs to the package "TYPO3 Fluid".
* See LICENSE.txt that was shipped with this package.
*/
namespace TYPO3Fluid\Fluid\Core\Variables;
/**
* Class JSONVariableProvider
*
* VariableProvider capable of using JSON files
* and streams as data source.
*/
class JSONVariableProvider extends StandardVariableProvider implements VariableProviderInterface
{
/**
* @var int
*/
protected $lastLoaded = 0;
/**
* Lifetime of fetched JSON sources before refetch. Using
* a hard value avoids the need to re-query using HEAD and
* should allow any HTTPD process to finish in time but make
* any CLI/infinite running scripts re-fetch JSON after this
* time has passed.
*
* @var int
*/
protected $ttl = 15;
/**
* JSON source. Either a complete JSON string with an object
* inside, or a reference to a JSON file either local or
* remote (supporting any stream types PHP supports).
*
* @var string
*/
protected $source;
/**
* @return mixed
*/
public function getSource()
{
return $this->source;
}
/**
* @param mixed $source
*/
public function setSource($source)
{
$this->source = $source;
}
/**
* @return array
*/
public function getAll()
{
$this->load();
return parent::getAll();
}
/**
* @param string $identifier
* @return mixed
*/
public function get($identifier)
{
$this->load();
return parent::get($identifier);
}
/**
* @param string $path
* @return mixed
*/
public function getByPath($path)
{
$this->load();
return parent::getByPath($path);
}
/**
* @return array
*/
public function getAllIdentifiers()
{
$this->load();
return parent::getAllIdentifiers();
}
protected function load()
{
if ($this->source !== null && time() > ($this->lastLoaded + $this->ttl)) {
if (!$this->isJSON($this->source)) {
$source = file_get_contents($this->source);
} else {
$source = $this->source;
}
$this->variables = json_decode($source, defined('JSON_OBJECT_AS_ARRAY') ? JSON_OBJECT_AS_ARRAY : 1);
$this->lastLoaded = time();
}
}
/**
* @param string $string
* @return bool
*/
protected function isJSON($string)
{
$string = trim($string);
return $string[0] === '{' && substr($string, -1) === '}';
}
}