fix(PasswordSharePropertyType): Generate default password when passwords are required

core/Sharing/Property/PasswordSharePropertyType.php

@@ -10,20 +10,29 @@
 namespace OC\Core\Sharing\Property;
 
 use OC\Core\AppInfo\Application;
+use OCP\EventDispatcher\IEventDispatcher;
 use OCP\L10N\IFactory;
+use OCP\Security\Events\GenerateSecurePasswordEvent;
 use OCP\Security\IHasher;
+use OCP\Security\ISecureRandom;
+use OCP\Security\PasswordContext;
 use OCP\Share\IManager;
 use OCP\Sharing\Property\APasswordSharePropertyType;
 use OCP\Sharing\Property\ISharePropertyTypeFilter;
 use OCP\Sharing\Share;
 use OCP\Sharing\ShareAccessContext;
+use Random\Randomizer;
 
 final class PasswordSharePropertyType extends APasswordSharePropertyType implements ISharePropertyTypeFilter {
 
+	private readonly Randomizer $randomizer;
+
 	public function __construct(
 		private readonly IManager $legacyManager,
 		private readonly IHasher $hasher,
+		private readonly IEventDispatcher $eventDispatcher,
 	) {
+		$this->randomizer = new Randomizer();
 	}
 
 	#[\Override]
@@ -54,7 +63,13 @@ public function isRequired(): bool {
 
 	#[\Override]
 	public function getDefaultValue(): ?string {
-		return null;
+		if (!$this->isRequired()) {
+			return null;
+		}
+
+		$event = new GenerateSecurePasswordEvent(PasswordContext::SHARING);
+		$this->eventDispatcher->dispatchTyped($event);
+		return $event->getPassword() ?? $this->randomizer->getBytesFromString(ISecureRandom::CHAR_ALPHANUMERIC, 20);
 	}
 
 	#[\Override]

tests/Core/Sharing/Property/PasswordSharePropertyTypeTest.php

@@ -9,9 +9,13 @@
 
 namespace Tests\Core\Sharing\Property;
 
+use OC\Core\AppInfo\Application;
+use OC\Core\AppInfo\ConfigLexicon;
 use OC\Core\Sharing\Property\PasswordSharePropertyType;
+use OCP\IAppConfig;
 use OCP\IUser;
 use OCP\IUserManager;
+use OCP\L10N\IFactory;
 use OCP\Security\IHasher;
 use OCP\Server;
 use OCP\Sharing\Property\ShareProperty;
@@ -64,6 +68,23 @@ private function createDummyShare(?ShareProperty $property): Share {
 		);
 	}
 
+	public function testGetDefaultValue(): void {
+		$appConfig = Server::get(IAppConfig::class);
+		$appConfig->deleteKey(Application::APP_ID, ConfigLexicon::SHARE_LINK_PASSWORD_ENFORCED);
+
+		$this->assertNull($this->propertyType->getDefaultValue());
+
+		$appConfig->setValueBool(Application::APP_ID, ConfigLexicon::SHARE_LINK_PASSWORD_ENFORCED, true);
+
+		$value = $this->propertyType->getDefaultValue();
+		$this->assertNotNull($value);
+		/** @psalm-suppress RedundantCastGivenDocblockType psalm:strict and rector:strict fight over the cast -_- */
+		$this->assertGreaterThan(1, strlen((string)$value));
+		$this->assertTrue($this->propertyType->validateValue(Server::get(IFactory::class), $value));
+
+		$appConfig->deleteKey(Application::APP_ID, ConfigLexicon::SHARE_LINK_PASSWORD_ENFORCED);
+	}
+
 	public function testIsFiltered(): void {
 		$this->assertFalse($this->propertyType->isFiltered(new ShareAccessContext(arguments: [$this->propertyType::class => '123']), $this->createDummyShare(new ShareProperty($this->propertyType::class, Server::get(IHasher::class)->hash('123')))));
 		$this->assertFalse($this->propertyType->isFiltered(new ShareAccessContext(arguments: [$this->propertyType::class => '123']), $this->createDummyShare(new ShareProperty($this->propertyType::class, null))));