better error messages for invalid regions, urltypes and service names

Signed-off-by: Robin Appelman <robin@icewind.nl>

lib/private/Files/ObjectStore/Swift.php

@@ -27,7 +27,11 @@ namespace OC\Files\ObjectStore;
 use Guzzle\Http\Exception\ClientErrorResponseException;
 use OCP\Files\ObjectStore\IObjectStore;
 use OCP\Files\StorageAuthException;
+use OCP\Files\StorageNotAvailableException;
 use OpenCloud\Common\Exceptions\EndpointError;
+use OpenCloud\Common\Service\Catalog;
+use OpenCloud\Common\Service\CatalogItem;
+use OpenCloud\ObjectStore\Service;
 use OpenCloud\OpenStack;
 use OpenCloud\Rackspace;
 
@@ -91,16 +95,32 @@ class Swift implements IObjectStore {
 			}
 		}
 
-		// the OpenCloud client library will default to 'cloudFiles' if $serviceName is null
-		$serviceName = null;
+		/** @var Catalog $catalog */
+		$catalog = $this->client->getCatalog();
+
 		if (isset($this->params['serviceName'])) {
 			$serviceName = $this->params['serviceName'];
+		} else {
+			$serviceName = Service::DEFAULT_NAME;
 		}
 
-		// the OpenCloud client library will default to 'publicURL' if $urlType is null
-		$urlType = null;
 		if (isset($this->params['urlType'])) {
 			$urlType = $this->params['urlType'];
+			if ($urlType !== 'internalURL' && $urlType !== 'publicURL') {
+				throw new StorageNotAvailableException('Invalid url type');
+			}
+		} else {
+			$urlType = Service::DEFAULT_URL_TYPE;
+		}
+
+		$catalogItem = $this->getCatalogForService($catalog, $serviceName);
+		if (!$catalogItem) {
+			$available = implode(', ', $this->getAvailableServiceNames($catalog));
+			throw new StorageNotAvailableException(
+				"Service $serviceName not found in service catalog, available services: $available"
+			);
+		} else if (isset($this->params['region'])) {
+			$this->validateRegion($catalogItem, $this->params['region']);
 		}
 
 		$this->objectStoreService = $this->client->objectStoreService($serviceName, $this->params['region'], $urlType);
@@ -117,6 +137,45 @@ class Swift implements IObjectStore {
 		}
 	}
 
+	/**
+	 * @param Catalog $catalog
+	 * @param $name
+	 * @return null|CatalogItem
+	 */
+	private function getCatalogForService(Catalog $catalog, $name) {
+		foreach ($catalog->getItems() as $item) {
+			/** @var CatalogItem $item */
+			if ($item->hasType(Service::DEFAULT_TYPE) && $item->hasName($name)) {
+				return $item;
+			}
+		}
+
+		return null;
+	}
+
+	private function validateRegion(CatalogItem $item, $region) {
+		$endPoints = $item->getEndpoints();
+		foreach ($endPoints as $endPoint) {
+			if ($endPoint->region === $region) {
+				return;
+			}
+		}
+
+		$availableRegions = implode(', ', array_map(function ($endpoint) {
+			return $endpoint->region;
+		}, $endPoints));
+
+		throw new StorageNotAvailableException("Invalid region '$region', available regions: $availableRegions");
+	}
+
+	private function getAvailableServiceNames(Catalog $catalog) {
+		return array_map(function (CatalogItem $item) {
+			return $item->getName();
+		}, array_filter($catalog->getItems(), function (CatalogItem $item) {
+			return $item->hasType(Service::DEFAULT_TYPE);
+		}));
+	}
+
 	/**
 	 * @return string the container name where objects are stored
 	 */