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| 1 | <?php |
| 2 | |
| 3 | declare(strict_types=1); |
| 4 | |
| 5 | namespace Cosray\Security; |
| 6 | |
| 7 | use Cosray\User; |
| 8 | |
| 9 | final class Policy |
| 10 | { |
| 11 | public const string EVERYONE = 'everyone'; |
| 12 | public const string AUTHENTICATED = 'authenticated'; |
| 13 | |
| 14 | /** @var array<string, string> */ |
| 15 | private array $roles = []; |
| 16 | |
| 17 | public function __construct( |
| 18 | private readonly Acl $acl = new Acl(), |
| 19 | ) {} |
| 20 | |
| 21 | public static function withDefaults(): self |
| 22 | { |
| 23 | $policy = new self(); |
| 24 | |
| 25 | $policy->role('superuser', 'Superuser'); |
| 26 | $policy->role('admin', 'Administrator'); |
| 27 | $policy->role('editor', 'Editor'); |
| 28 | |
| 29 | $policy->allow( |
| 30 | 'role:superuser', |
| 31 | 'panel', |
| 32 | 'read-nodes', |
| 33 | 'edit-nodes', |
| 34 | 'edit-menus', |
| 35 | 'manage-menus', |
| 36 | 'edit-users', |
| 37 | 'edit-settings', |
| 38 | ); |
| 39 | $policy->allow('role:admin', 'panel', 'read-nodes', 'edit-nodes', 'edit-menus', 'edit-users'); |
| 40 | $policy->allow('role:editor', 'panel', 'read-nodes', 'edit-nodes'); |
| 41 | // What the website shows anyone: published nodes of routable types. |
| 42 | $policy->allow(self::EVERYONE, 'read-pages'); |
| 43 | |
| 44 | return $policy; |
| 45 | } |
| 46 | |
| 47 | public function role(string $name, string $label): void |
| 48 | { |
| 49 | $this->roles[$name] = $label; |
| 50 | } |
| 51 | |
| 52 | /** @return array<string, string> */ |
| 53 | public function roles(): array |
| 54 | { |
| 55 | return $this->roles; |
| 56 | } |
| 57 | |
| 58 | public function allow(string $principal, string ...$permissions): void |
| 59 | { |
| 60 | $this->acl->allow($principal, ...$permissions); |
| 61 | } |
| 62 | |
| 63 | /** |
| 64 | * A stored role the app no longer defines grants nothing. |
| 65 | * |
| 66 | * @return list<string> |
| 67 | */ |
| 68 | public function principals(?User $user): array |
| 69 | { |
| 70 | if ($user === null) { |
| 71 | return [self::EVERYONE]; |
| 72 | } |
| 73 | |
| 74 | $principals = [self::EVERYONE, self::AUTHENTICATED, "user:{$user->uid}", "type:{$user->type}"]; |
| 75 | |
| 76 | foreach ($user->roles as $role) { |
| 77 | if (isset($this->roles[$role])) { |
| 78 | $principals[] = "role:{$role}"; |
| 79 | } |
| 80 | } |
| 81 | |
| 82 | return $principals; |
| 83 | } |
| 84 | |
| 85 | public function permits(?User $user, string $permission): bool |
| 86 | { |
| 87 | return $this->acl->permits($this->principals($user), $permission); |
| 88 | } |
| 89 | |
| 90 | /** |
| 91 | * Whether the user holds everything the given roles grant. Managing an |
| 92 | * account or handing out a role must never reach beyond one's own |
| 93 | * permissions. |
| 94 | */ |
| 95 | public function covers(User $user, string ...$roles): bool |
| 96 | { |
| 97 | foreach ($roles as $role) { |
| 98 | foreach ($this->acl->permissions("role:{$role}") as $permission) { |
| 99 | if (!$this->permits($user, $permission)) { |
| 100 | return false; |
| 101 | } |
| 102 | } |
| 103 | } |
| 104 | |
| 105 | return true; |
| 106 | } |
| 107 | } |