BookStack/app/Entities/SlugGenerator.php

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<?php namespace BookStack\Entities;
class SlugGenerator
{
protected $entity;
/**
* SlugGenerator constructor.
* @param $entity
*/
public function __construct(Entity $entity)
{
$this->entity = $entity;
}
/**
* Generate a fresh slug for the given entity.
* The slug will generated so it does not conflict within the same parent item.
*/
public function generate(): string
{
$slug = $this->formatNameAsSlug($this->entity->name);
while ($this->slugInUse($slug)) {
$slug .= '-' . substr(md5(rand(1, 500)), 0, 3);
}
return $slug;
}
/**
* Format a name as a url slug.
*/
protected function formatNameAsSlug(string $name): string
{
$slug = preg_replace('/[\+\/\\\?\@\}\{\.\,\=\[\]\#\&\!\*\'\;\:\$\%]/', '', mb_strtolower($name));
$slug = preg_replace('/\s{2,}/', ' ', $slug);
$slug = str_replace(' ', '-', $slug);
if ($slug === "") {
$slug = substr(md5(rand(1, 500)), 0, 5);
}
return $slug;
}
/**
* Check if a slug is already in-use for this
* type of model within the same parent.
*/
protected function slugInUse(string $slug): bool
{
$query = $this->entity->newQuery()->where('slug', '=', $slug);
if ($this->entity instanceof BookChild) {
$query->where('book_id', '=', $this->entity->book_id);
}
if ($this->entity->id) {
$query->where('id', '!=', $this->entity->id);
}
return $query->count() > 0;
}
}