<?php
namespace Livewire\HydrationMiddleware;
use Illuminate\Support\Arr;
class HashDataPropertiesForDirtyDetection implements HydrationMiddleware
{
protected static $propertyHashesByComponentId = [];
public static function hydrate($instance, $request)
{
$data = data_get($request, 'memo.data', []);
collect($data)->each(function ($value, $key) use ($instance) {
if (is_array($value)) {
foreach (Arr::dot($value, $key.'.') as $dottedKey => $value) {
static::rehashProperty($dottedKey, $value, $instance);
}
} else {
static::rehashProperty($key, $value, $instance);
}
});
}
public static function dehydrate($instance, $response)
{
$data = data_get($response, 'memo.data', []);
$dirtyProps = collect(static::$propertyHashesByComponentId[$instance->id] ?? [])
->filter(function ($hash, $key) use ($data) {
// Only return the propertyHashes/props that have changed.
return static::hash(data_get($data, $key)) !== $hash;
})
->keys()
->toArray();
data_set($response, 'effects.dirty', $dirtyProps);
}
public static function rehashProperty($name, $value, $component)
{
static::$propertyHashesByComponentId[$component->id][$name] = static::hash($value);
}
public static function hash($value)
{
if (! is_null($value) && ! is_string($value) && ! is_numeric($value) && ! is_bool($value)) {
if (is_array($value)) {
return json_encode($value);
}
$value = method_exists($value, '__toString')
? (string) $value
: json_encode($value);
}
// Using crc32 because it's fast, and this doesn't have to be secure.
return crc32($value ?? '');
}
}