Emit hook postUnshareFromSelf when the recipient of a share unshares it

- This kind of hook signal used to be emitted in the old Share library but it was missing from Share 2.0

Signed-off-by: Pauli Järvinen <pauli.jarvinen@gmail.com>

lib/private/Share20/LegacyHooks.php

@@ -40,6 +40,7 @@ class LegacyHooks {
 
 		$this->eventDispatcher->addListener('OCP\Share::preUnshare', [$this, 'preUnshare']);
 		$this->eventDispatcher->addListener('OCP\Share::postUnshare', [$this, 'postUnshare']);
+		$this->eventDispatcher->addListener('OCP\Share::postUnshareFromSelf', [$this, 'postUnshareFromSelf']);
 	}
 
 	/**
@@ -74,6 +75,20 @@ class LegacyHooks {
 		\OC_Hook::emit('OCP\Share', 'post_unshare', $formatted);
 	}
 
+	/**
+	 * @param GenericEvent $e
+	 */
+	public function postUnshareFromSelf(GenericEvent $e) {
+		/** @var IShare $share */
+		$share = $e->getSubject();
+
+		$formatted = $this->formatHookParams($share);
+		$formatted['itemTarget'] = $formatted['fileTarget'];
+		$formatted['unsharedItems'] = [$formatted];
+
+		\OC_Hook::emit('OCP\Share', 'post_unshareFromSelf', $formatted);
+	}
+
 	private function formatHookParams(IShare $share) {
 		// Prepare hook
 		$shareType = $share->getShareType();

lib/private/Share20/Manager.php

@@ -873,6 +873,8 @@ class Manager implements IManager {
 		$provider = $this->factory->getProvider($providerId);
 
 		$provider->deleteFromSelf($share, $recipientId);
+		$event = new GenericEvent($share);
+		$this->eventDispatcher->dispatch('OCP\Share::postUnshareFromSelf', $event);
 	}
 
 	/**

tests/lib/Share20/LegacyHooksTest.php

@@ -135,4 +135,56 @@ class LegacyHooksTest extends TestCase {
 		$event->setArgument('deletedShares', [$share]);
 		$this->eventDispatcher->dispatch('OCP\Share::postUnshare', $event);
 	}
+
+	public function testPostUnshareFromSelf() {
+		$path = $this->createMock(File::class);
+		$path->method('getId')->willReturn(1);
+
+		$share = $this->manager->newShare();
+		$share->setId(42)
+			->setProviderId('prov')
+			->setShareType(\OCP\Share::SHARE_TYPE_USER)
+			->setSharedWith('awesomeUser')
+			->setSharedBy('sharedBy')
+			->setNode($path)
+			->setTarget('myTarget');
+
+		$hookListner = $this->getMockBuilder('Dummy')->setMethods(['postFromSelf'])->getMock();
+		\OCP\Util::connectHook('OCP\Share', 'post_unshareFromSelf', $hookListner, 'postFromSelf');
+
+		$hookListnerExpectsPostFromSelf = [
+			'id' => 42,
+			'itemType' => 'file',
+			'itemSource' => 1,
+			'shareType' => \OCP\Share::SHARE_TYPE_USER,
+			'shareWith' => 'awesomeUser',
+			'itemparent' => null,
+			'uidOwner' => 'sharedBy',
+			'fileSource' => 1,
+			'fileTarget' => 'myTarget',
+			'itemTarget' => 'myTarget',
+			'unsharedItems' => [
+				[
+					'id' => 42,
+					'itemType' => 'file',
+					'itemSource' => 1,
+					'shareType' => \OCP\Share::SHARE_TYPE_USER,
+					'shareWith' => 'awesomeUser',
+					'itemparent' => null,
+					'uidOwner' => 'sharedBy',
+					'fileSource' => 1,
+					'fileTarget' => 'myTarget',
+					'itemTarget' => 'myTarget',
+				],
+			],
+		];
+
+		$hookListner
+			->expects($this->exactly(1))
+			->method('postFromSelf')
+			->with($hookListnerExpectsPostFromSelf);
+
+		$event = new GenericEvent($share);
+		$this->eventDispatcher->dispatch('OCP\Share::postUnshareFromSelf', $event);
+	}
 }

tests/lib/Share20/ManagerTest.php

@@ -332,6 +332,40 @@ class ManagerTest extends \Test\TestCase {
 		$manager->deleteShare($share1);
 	}
 
+	public function testDeleteFromSelf() {
+		$manager = $this->createManagerMock()
+			->setMethods(['getShareById'])
+			->getMock();
+
+		$recipientId = 'unshareFrom';
+		$share = $this->manager->newShare();
+		$share->setId(42)
+			->setProviderId('prov')
+			->setShareType(\OCP\Share::SHARE_TYPE_USER)
+			->setSharedWith('sharedWith')
+			->setSharedBy('sharedBy')
+			->setShareOwner('shareOwner')
+			->setTarget('myTarget')
+			->setNodeId(1)
+			->setNodeType('file');
+
+		$this->defaultProvider
+			->expects($this->once())
+			->method('deleteFromSelf')
+			->with($share, $recipientId);
+
+		$this->eventDispatcher->expects($this->at(0))
+			->method('dispatch')
+			->with(
+				'OCP\Share::postUnshareFromSelf',
+				$this->callBack(function(GenericEvent $e) use ($share) {
+					return $e->getSubject() === $share;
+				})
+			);
+
+		$manager->deleteFromSelf($share, $recipientId);
+	}
+
 	public function testDeleteChildren() {
 		$manager = $this->createManagerMock()
 			->setMethods(['deleteShare'])