A pending shares overview

Now that we accept shares we should show an overview of shares that are
pending. This first part is the small API to get a list of the currently
pending shares.

Signed-off-by: Roeland Jago Douma <roeland@famdouma.nl>

apps/files_sharing/appinfo/routes.php

@@ -75,6 +75,11 @@ return [
 			'url'  => '/api/v1/shares',
 			'verb' => 'POST',
 		],
+		[
+			'name' => 'ShareAPI#pendingShares',
+			'url'  => '/api/v1/shares/pending',
+			'verb' => 'GET',
+		],
 		[
 			'name' => 'ShareAPI#getShare',
 			'url'  => '/api/v1/shares/{id}',

apps/files_sharing/lib/Controller/ShareAPIController.php

@@ -1079,6 +1079,36 @@ class ShareAPIController extends OCSController {
 		return new DataResponse($this->formatShare($share));
 	}
 
+	/**
+	 * @NoAdminRequired
+	 */
+	public function pendingShares(): DataResponse {
+		$pendingShares = [];
+
+		$shareTypes = [
+			IShare::TYPE_USER,
+			IShare::TYPE_GROUP
+		];
+
+		foreach ($shareTypes as $shareType) {
+			$shares = $this->shareManager->getSharedWith($this->currentUser, $shareType, null, -1, 0);
+
+			foreach ($shares as $share) {
+				if ($share->getStatus() === IShare::STATUS_PENDING || $share->getStatus() === IShare::STATUS_REJECTED) {
+					$pendingShares[] = $share;
+				}
+			}
+		}
+
+		$result = array_map(function (IShare $share) {
+			return [
+				'id' => $share->getFullId(),
+			];
+		}, $pendingShares);
+
+		return new DataResponse($result);
+	}
+
 	/**
 	 * @NoAdminRequired
 	 *