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<?php |
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namespace Sco\Admin\Component\Concerns; |
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use Illuminate\Support\Collection; |
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use Illuminate\Support\Str; |
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trait HasAccess |
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{ |
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/** |
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* @var \Illuminate\Support\Collection |
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*/ |
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protected $abilities; |
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/** |
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* Access observer class |
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* |
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* @var string |
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*/ |
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protected $observer = \Sco\Admin\Component\Observer::class; |
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/** |
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* User exposed observable abilities. |
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* |
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* @var array |
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*/ |
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protected $observables = []; |
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public function bootHasAccess() |
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{ |
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$this->abilities = new Collection(); |
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$this->observe($this->observer); |
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} |
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public function isView() |
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{ |
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return method_exists($this, 'callView') && $this->can('view'); |
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} |
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public function isCreate() |
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{ |
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return method_exists($this, 'callCreate') && $this->can('create'); |
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} |
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public function isEdit() |
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{ |
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return method_exists($this, 'callEdit') && $this->can('edit'); |
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} |
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public function isDelete() |
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{ |
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return $this->can('delete'); |
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} |
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public function isDestroy() |
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{ |
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return $this->isRestorableModel() && $this->can('destroy'); |
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} |
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public function isRestore() |
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{ |
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return $this->isRestorableModel() && $this->can('restore'); |
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} |
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protected function isRestorableModel() |
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{ |
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return $this->getRepository()->isRestorable(); |
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} |
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/** |
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* Register an observer with the Component. |
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* |
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* @param $class |
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*/ |
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public function observe($class) |
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{ |
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$className = is_string($class) ? $class : get_class($class); |
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foreach ($this->getObservableAbilities() as $ability) { |
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if (method_exists($class, $ability)) { |
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$this->registerAbility( |
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$ability, |
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$className . '@' . $ability |
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); |
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} |
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} |
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} |
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/** |
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* Get the observable ability names. |
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* |
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* @return array |
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*/ |
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public function getObservableAbilities() |
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{ |
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return array_merge( |
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[ |
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'view', 'create', 'edit', 'delete', |
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'destroy', 'restore', |
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], |
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$this->observables |
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); |
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} |
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public function registerAbility($ability, $callback) |
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{ |
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$this->abilities->put($ability, $this->makeAbilityCallback($callback)); |
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} |
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protected function makeAbilityCallback($callback) |
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{ |
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return function ($component) use ($callback) { |
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if (is_callable($callback)) { |
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return $callback($component); |
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} |
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if (is_string($callback)) { |
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list($class, $method) = Str::parseCallback($callback); |
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return call_user_func([$this->app->make($class), $method], $component); |
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} |
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}; |
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} |
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/** |
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* @param string $ability |
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* |
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* @return mixed |
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*/ |
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final public function can($ability) |
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{ |
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if (!$this->abilities->has($ability)) { |
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return false; |
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} |
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$value = $this->abilities->get($ability); |
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return $value($this) ? true : false; |
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} |
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public function getAccesses() |
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{ |
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return $this->abilities->mapWithKeys(function ($item, $key) { |
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return [$key => $this->can($key)]; |
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}); |
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} |
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} |
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This check looks for methods that are used by a trait but not required by it.
To illustrate, let’s look at the following code example
The trait
Idable
provides a methodequalsId
that in turn relies on the methodgetId()
. If this method does not exist on a class mixing in this trait, the method will fail.Adding the
getId()
as an abstract method to the trait will make sure it is available.