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<?php |
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declare(strict_types=1); |
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namespace Arcanedev\LaravelPolicies; |
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use Arcanedev\LaravelPolicies\Contracts\Ability as AbilityContract; |
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use Arcanedev\LaravelPolicies\Contracts\Policy as PolicyContract; |
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use Arcanedev\LaravelPolicies\Contracts\PolicyManager as PolicyManagerContract; |
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use Illuminate\Contracts\Auth\Access\Gate; |
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use Illuminate\Contracts\Foundation\Application; |
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use Illuminate\Support\Collection; |
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/** |
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* Class PolicyManager |
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* |
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* @author ARCANEDEV <[email protected]> |
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*/ |
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class PolicyManager implements PolicyManagerContract |
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{ |
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/* ----------------------------------------------------------------- |
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| Properties |
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| ----------------------------------------------------------------- |
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*/ |
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/** @var \Illuminate\Contracts\Foundation\Application */ |
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protected $app; |
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/** @var \Illuminate\Support\Collection */ |
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protected $policies; |
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/** @var \Illuminate\Support\Collection */ |
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protected $abilities; |
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/* ----------------------------------------------------------------- |
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| Constructor |
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| ----------------------------------------------------------------- |
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*/ |
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/** |
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* PolicyManager constructor. |
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* |
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* @param \Illuminate\Contracts\Foundation\Application $app |
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*/ |
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public function __construct(Application $app) |
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{ |
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$this->app = $app; |
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$this->policies = new Collection; |
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$this->abilities = new Collection; |
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} |
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/* ----------------------------------------------------------------- |
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| Getters |
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| ----------------------------------------------------------------- |
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*/ |
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/** |
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* Get the registered policies. |
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* |
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* @return \Arcanedev\LaravelPolicies\Contracts\Policy[]|\Illuminate\Support\Collection |
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*/ |
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public function policies(): Collection |
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{ |
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return $this->policies; |
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} |
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/** |
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* Get the registered abilities. |
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* |
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* @return \Arcanedev\LaravelPolicies\Ability[]|\Illuminate\Support\Collection |
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*/ |
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public function abilities(): Collection |
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{ |
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return $this->abilities; |
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} |
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/* ----------------------------------------------------------------- |
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| Main Methods |
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| ----------------------------------------------------------------- |
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*/ |
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/** |
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* Parse policies classes. |
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* |
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* @param iterable $classes |
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* |
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* @return \Illuminate\Support\Collection |
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*/ |
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public function parsePolicies(iterable $classes): Collection |
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{ |
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return Collection::make($classes)->transform(function (string $class) { |
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return $this->parsePolicy($class); |
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}); |
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} |
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/** |
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* Parse the class into a policy instance. |
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* |
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* @param string $class |
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* |
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* @return \Arcanedev\LaravelPolicies\Contracts\Policy|mixed |
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*/ |
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public function parsePolicy(string $class): PolicyContract |
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{ |
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return $this->app->make($class); |
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} |
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/** |
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* Register a policy class. |
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* |
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* @param string $class |
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* |
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* @return \Arcanedev\LaravelPolicies\Contracts\PolicyManager |
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*/ |
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public function registerClass(string $class): PolicyManagerContract |
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{ |
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return $this->register( |
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$this->parsePolicy($class) |
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); |
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} |
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/** |
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* Register a policy instance. |
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* |
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* @param \Arcanedev\LaravelPolicies\Contracts\Policy $policy |
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* |
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* @return \Arcanedev\LaravelPolicies\Contracts\PolicyManager |
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*/ |
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public function register(PolicyContract $policy): PolicyManagerContract |
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{ |
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$this->policies->put(get_class($policy), $policy); |
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foreach ($this->app->call([$policy, 'abilities']) as $ability) { |
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$this->registerAbility($ability); |
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} |
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return $this; |
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} |
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/* ----------------------------------------------------------------- |
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| Other Methods |
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| ----------------------------------------------------------------- |
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*/ |
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/** |
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* Register the ability object. |
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* |
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* @param \Arcanedev\LaravelPolicies\Contracts\Ability $ability |
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* |
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* @return $this |
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*/ |
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protected function registerAbility(AbilityContract $ability) |
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{ |
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$this->abilities->put($ability->key(), $ability); |
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$this->gate()->define($ability->key(), $ability->method()); |
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return $this; |
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} |
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/** |
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* Get the gate access instance. |
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* |
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* @return \Illuminate\Contracts\Auth\Access\Gate|mixed |
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*/ |
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private function gate(): Gate |
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{ |
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return $this->app->make(Gate::class); |
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} |
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} |
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If you return a value from a function or method, it should be a sub-type of the type that is given by the parent type f.e. an interface, or abstract method. This is more formally defined by the Lizkov substitution principle, and guarantees that classes that depend on the parent type can use any instance of a child type interchangably. This principle also belongs to the SOLID principles for object oriented design.
Let’s take a look at an example:
Our function
my_function
expects aPost
object, and outputs the author of the post. The base classPost
returns a simple string and outputting a simple string will work just fine. However, the child classBlogPost
which is a sub-type ofPost
instead decided to return anobject
, and is therefore violating the SOLID principles. If aBlogPost
were passed tomy_function
, PHP would not complain, but ultimately fail when executing thestrtoupper
call in its body.