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HasHashSlug.php
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HasHashSlug.php
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<?php
/*
Laravel HashSlug: Package providing a trait to use Hashids on a model
Copyright (C) 2017 Balázs Dura-Kovács
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http:https://www.gnu.org/licenses/>.
*/
namespace Balping\HashSlug;
trait HasHashSlug {
/**
* Cached hashslug
* @var null|string
*/
private $slug = null;
/**
* Cached HashIds instance
* @var null|\Hashids\Hashids
*/
private static $hashIds = null;
/**
* Returns a chached Hashids instanse
* or initialises it with salt
*
* @return \Hashids\Hashids
*/
private static function getHashids(){
if (is_null(static::$hashIds)){
$minSlugLength = 5;
if(isset(static::$minSlugLength)) {
$minSlugLength = static::$minSlugLength;
}
if(isset(static::$modelSalt)) {
$modelSalt = static::$modelSalt;
}else{
$modelSalt = get_called_class();
}
if(isset(static::$alphabet)) {
$alphabet = static::$alphabet;
}else{
$alphabet = 'abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ1234567890';
}
$salt = config('hashslug.appsalt', env('APP_KEY')) . $modelSalt;
// This is impotant!
// Don't use a weak hash, otherwise
// your app key can be exposed
// http:https://carnage.github.io/2015/08/cryptanalysis-of-hashids
$salt = hash('sha256', $salt);
static::$hashIds = new \Hashids\Hashids($salt, $minSlugLength, $alphabet);
}
return static::$hashIds;
}
/**
* Hashslug calculated from id
* @return string
*/
public function slug(){
if (is_null($this->slug)){
$hashids = $this->getHashids();
$this->slug = $hashids->encode($this->{$this->getKeyName()});
}
return $this->slug;
}
public function getRouteKeyName(){
return 'hashslug';
}
public function getRouteKey() {
return $this->slug();
}
/**
* Used in explicit model binding if no callback
* is specified, eg: Route::model('post', Post::class)
*
* @param string $slug
* @return \Illuminate\Database\Eloquent\Model
*/
public function resolveRouteBinding($slug){
$id = static::decodeSlug($slug);
return parent::where($this->getKeyName(), $id)->first();
}
/**
* Terrible hack to make automatic implicit route model binding possible
*
* @see \Illuminate\Routing\RouteBinding@forModel
*
* @param string|array|\Closure $column
* @param string $operator
* @param mixed $value
* @param string $boolean
* @return \Illuminate\Database\Query\Builder
*/
public function where(... $arguments){
if($arguments[0] == 'hashslug'){
$id = static::decodeSlug($arguments[1]);
return parent::where($this->getKeyName(), $id);
}else{
return parent::where(... $arguments);
}
}
/**
* Decodes slug to id
* @param string $slug
* @return int
*/
private static function decodeSlug($slug){
$hashids = static::getHashids();
$id = (int) $hashids->decode($slug)[0];
return $id;
}
/**
* Wrapper around Model::findOrFail
*
* @param string $slug
* @return \Illuminate\Database\Eloquent\Model
*/
public static function findBySlugOrFail($slug){
$id = static::decodeSlug($slug);
return static::findOrFail($id);
}
/**
* Wrapper around Model::find
*
* @param string $slug
* @return \Illuminate\Database\Eloquent\Model
*/
public static function findBySlug($slug){
$id = static::decodeSlug($slug);
return static::find($id);
}
}