Changed autoloading from PSR-0 to PSR-4

CloudObjects/SDK/AccountGateway/AccountContext.php

@@ -40,7 +40,7 @@ class AccountContext {
 	/**
 	 * Create a new context using an AAUID and an OAuth 2.0 bearer access token.
 	 */
-	public function __construct(IRI $aauid, $accessToken, DataLoader $dataLoader = null) {
+	public function __construct(IRI $aauid, $accessToken, ?DataLoader $dataLoader = null) {
 		if (AAUIDParser::getType($aauid) != AAUIDParser::AAUID_ACCOUNT)
 			throw new \Exception("Not a valid AAUID");
 

CloudObjects/SDK/CloudObject.php

@@ -85,7 +85,7 @@ class CloudObject {
      * Get the value of a property as a string.
      * If the property has multiple values, only the first is returned.
      */
-    public function getString($property, string $default = null) : ?string {
+    public function getString($property, ?string $default = null) : ?string {
         return $this->getReader()->getFirstValueString($this->node, $property, $default);
     }
 
@@ -93,7 +93,7 @@ class CloudObject {
      * Get the value of a property as an integer.
      * If the property has multiple values, only the first is returned.
      */
-    public function getInt($property, int $default = null) : ?int {
+    public function getInt($property, ?int $default = null) : ?int {
         return $this->getReader()->getFirstValueInt($this->node, $property, $default);
     }
 
@@ -101,7 +101,7 @@ class CloudObject {
      * Get the value of a property as a float.
      * If the property has multiple values, only the first is returned.
      */
-    public function getFloat($property, float $default = null) : ?float {
+    public function getFloat($property, ?float $default = null) : ?float {
         return $this->getReader()->getFirstValueFloat($this->node, $property, $default);
     }
 
@@ -109,7 +109,7 @@ class CloudObject {
      * Get the value of a property as a boolean.
      * If the property has multiple values, only the first is returned.
      */
-    public function getBool($property, bool $default = null) : ?bool {
+    public function getBool($property, ?bool $default = null) : ?bool {
         return $this->getReader()->getFirstValueBool($this->node, $property, $default);
     }
 
@@ -117,7 +117,7 @@ class CloudObject {
      * Get the value of a property as an IRI.
      * If the property has multiple values, only the first is returned.
      */
-    public function getIRI($property, IRI $default = null) : ?IRI {
+    public function getIRI($property, ?IRI $default = null) : ?IRI {
         return $this->getReader()->getFirstValueIRI($this->node, $property, $default);
     }
 
@@ -125,7 +125,7 @@ class CloudObject {
      * Get the value of a property as a Node.
      * If the property has multiple values, only the first is returned.
      */
-    public function getNode($property, Node $default = null) : ?Node {
+    public function getNode($property, ?Node $default = null) : ?Node {
         return $this->getReader()->getFirstValueNode($this->node, $property, $default);
     }
 
@@ -166,4 +166,11 @@ class CloudObject {
         return $this->getString(Constants::PROPERTY_REVISION);
     }
 
+    /**
+     * Get the label of the object.
+     */
+    public function getLabel() : ?string {
+        return $this->getString(Constants::RDFS_LABEL);
+    }
+
 }

CloudObjects/SDK/Common/CryptoHelper.php

@@ -53,7 +53,7 @@ class CryptoHelper {
      * @param ObjectRetriever $objectRetriever An initialized and authenticated object retriever.
      * @param IRI|null $namespaceCoid The namespace used to retrieve keys. If this parameter is not provided, the namespace provided with the "auth_ns" configuration option from the object retriever is used.
      */
-    public function __construct(ObjectRetriever $objectRetriever, IRI $namespaceCoid = null) {
+    public function __construct(ObjectRetriever $objectRetriever, ?IRI $namespaceCoid = null) {
         if (!class_exists('Defuse\Crypto\Crypto'))
             throw new Exception("Run composer require defuse/php-encryption before using CryptoHelper.");
 

CloudObjects/SDK/Constants.php

@@ -9,5 +9,6 @@ namespace CloudObjects\SDK;
 class Constants {
 
     const PROPERTY_REVISION = 'coid://cloudobjects.io/isAtRevision';
+    const RDFS_LABEL = 'http://www.w3.org/2000/01/rdf-schema#label';
 
 }

CloudObjects/SDK/Helpers/SDKLoader.php

@@ -7,6 +7,7 @@
 namespace CloudObjects\SDK\Helpers;
 
 use Exception;
+use CloudObjects\SDK\Exceptions\InvalidSDKConfigurationException;
 use CloudObjects\SDK\NodeReader, CloudObjects\SDK\ObjectRetriever;
 
 /**
@@ -27,20 +28,53 @@ class SDKLoader {
         $this->reader = new NodeReader;
     }
 
+    /**
+     * Initialize the SDK with the given name and options; used for
+     * SDKs that are initialized with a function and not a class name.
+     *
+     * @param string $sdkName The name of the SDK to initialize.
+     * @param array $options Additional options for the SDK (if necessary).
+     * @return mixed The return value of the SDK initialization, which may vary depending on the SDK.
+     * @throws Exception If the SDK is not supported or cannot be initialized.
+     */
+    public function init(string $sdkName, array $options = []) : mixed {
+        $namespace = $this->objectRetriever->getAuthenticatingNamespaceCloudObject();
+
+        if (!$namespace)
+            throw new InvalidSDKConfigurationException("The authenticating namespace object could not be retrieved.");
+
+        switch (strtolower($sdkName)) {
+            case "sentry":
+                // --- Sentry (https://sentry.io/) ---
+                $initFunction = '\Sentry\init';
+                return $initFunction(array_merge([
+                    'dsn' => $namespace->getString('coid://sentry.io.3rd-party.co/DSN')
+                ], $options));
+
+            default:
+                throw new Exception("No rules defined to initialize SDK with name <".$sdkName.">.");
+        }
+    }
+
     /**
      * Initialize and return the SDK with the given classname.
      * Throws Exception if the SDK is not supported.
      * 
-     * @param $classname Classname for the SDK's main class
-     * @param array $options Additional options for the SDK (if necessary)
+     * @param string $classname Classname for the SDK's main class.
+     * @param array $options Additional options for the SDK (if necessary).
+     * @return mixed The initialized SDK instance.
+     * @throws Exception If the SDK is not supported or cannot be initialized.
      */
-    public function get($classname, array $options) {
+    public function get(string $classname, array $options) : mixed {
         if (!class_exists($classname))
             throw new Exception("<".$classname."> is not a valid classname.");
 
         $hashkey = md5($classname.serialize($options));
         if (!isset($this->classes[$hashkey])) {
-            $nsNode = $this->objectRetriever->getAuthenticatingNamespaceObject();
+            $nsNode = $this->objectRetriever->getAuthenticatingNamespaceObjectNode();
+
+            if (!$nsNode)
+                throw new InvalidSDKConfigurationException("The authenticating namespace object could not be retrieved.");
 
             // --- Amazon Web Services (https://aws.amazon.com/) ---
             // has multiple classnames, so check for common superclass

CloudObjects/SDK/NodeReader.php

@@ -38,7 +38,7 @@ class NodeReader {
      * @param string|object $type The type to check for.
      * @return boolean
      */
-    public function hasType(Node $node = null, $type) {
+    public function hasType(?Node $node = null, $type) {
         if (!isset($node))
             return false;
         $type = $this->expand($type);
@@ -60,7 +60,7 @@ class NodeReader {
         return false;
     }
 
-    private function getFirstValue(Node $node = null, $property, $default = null) {
+    private function getFirstValue(?Node $node = null, $property, $default = null) {
         if (!isset($node))
             return $default;
         $valueFromNode = $node->getProperty($this->expand($property));
@@ -82,7 +82,7 @@ class NodeReader {
      * @param $default The default that is returned if no value for the property exists on the node.
      * @return string|null
      */
-    public function getFirstValueString(Node $node = null, $property, $default = null) {
+    public function getFirstValueString(?Node $node = null, $property, $default = null) {
         $valueFromNode = $this->getFirstValue($node, $property, $default);
         if ($valueFromNode == $default)
             return $default;
@@ -103,7 +103,7 @@ class NodeReader {
      * @param $default The default that is returned if no value for the property exists on the node.
      * @return bool|null
      */
-    public function getFirstValueBool(Node $node = null, $property, $default = null) {
+    public function getFirstValueBool(?Node $node = null, $property, $default = null) {
         return (in_array(
             $this->getFirstValueString($node, $property, $default),
             [ '1', 'true' ]
@@ -120,7 +120,7 @@ class NodeReader {
      * @param $default The default that is returned if no value for the property exists on the node.
      * @return int|null
      */
-    public function getFirstValueInt(Node $node = null, $property, $default = null) {
+    public function getFirstValueInt(?Node $node = null, $property, $default = null) {
         $value = $this->getFirstValueString($node, $property);
         if (is_numeric($value))
             return (int)($value);
@@ -138,7 +138,7 @@ class NodeReader {
      * @param $default The default that is returned if no value for the property exists on the node.
      * @return float|null
      */
-    public function getFirstValueFloat(Node $node = null, $property, $default = null) {
+    public function getFirstValueFloat(?Node $node = null, $property, $default = null) {
         $value = $this->getFirstValueString($node, $property);
         if (is_numeric($value))
             return (float)($value);
@@ -156,7 +156,7 @@ class NodeReader {
      * @param $default The default that is returned if no value for the property exists on the node.
      * @return string|null
      */
-    public function getFirstValueIRI(Node $node = null, $property, IRI $default = null) {
+    public function getFirstValueIRI(?Node $node = null, $property, ?IRI $default = null) {
         $valueFromNode = $this->getFirstValue($node, $property, $default);
         if ($valueFromNode == $default)
             return $default;
@@ -177,7 +177,7 @@ class NodeReader {
      * @param $default The default that is returned if no value for the property exists on the node.
      * @return string|null
      */
-    public function getFirstValueNode(Node $node = null, $property, Node $default = null) {
+    public function getFirstValueNode(?Node $node = null, $property, ?Node $default = null) {
         $valueFromNode = $this->getFirstValue($node, $property, $default);
         if ($valueFromNode == $default)
             return $default;
@@ -196,7 +196,7 @@ class NodeReader {
      * @param string|object $value The expected value.
      * @return boolean
      */
-    public function hasPropertyValue(Node $node = null, $property, $value) {
+    public function hasPropertyValue(?Node $node = null, $property, $value) {
         if (!isset($node))
             return false;
         $valuesFromNode = $node->getProperty($this->expand($property));
@@ -225,14 +225,14 @@ class NodeReader {
      * @param string|object $property The property to read.
      * @return boolean
      */
-    public function hasProperty(Node $node = null, $property) {
+    public function hasProperty(?Node $node = null, $property) {
         if (!isset($node))
             return false;
         
         return ($node->getProperty($this->expand($property)) != null);
     }
 
-    private function getAllValues(Node $node = null, $property) {
+    private function getAllValues(?Node $node = null, $property) {
         if (!isset($node))
             return [];
 
@@ -248,7 +248,7 @@ class NodeReader {
      * Get the language-tagged-string for the property in the specified language.
      * If no value is found for the specified language, the default is returned.
      */
-    public function getLocalizedString(Node $node = null, $property, $language, $default = null) {
+    public function getLocalizedString(?Node $node = null, $property, $language, $default = null) {
         $values = $this->getAllValues($node, $property);
         foreach ($values as $v) {
             if (is_a($v, 'ML\JsonLD\LanguageTaggedString') && $v->getLanguage() == $language)
@@ -265,7 +265,7 @@ class NodeReader {
      * @param string|object $property The property to read.
      * @return array<string>
      */
-    public function getAllValuesString(Node $node = null, $property) {
+    public function getAllValuesString(?Node $node = null, $property) {
         $allValues = $this->getAllValues($node, $property);
         $output = [];
         foreach ($allValues as $a)
@@ -284,7 +284,7 @@ class NodeReader {
      * @param string|object $property The property to read.
      * @return array<bool>
      */
-    public function getAllValuesBool(Node $node = null, $property) {
+    public function getAllValuesBool(?Node $node = null, $property) {
         $allValues = $this->getAllValuesString($node, $property);
         $output = [];
         foreach ($allValues as $a)
@@ -300,7 +300,7 @@ class NodeReader {
      * @param string|object $property The property to read.
      * @return array<bool>
      */
-    public function getAllValuesInt(Node $node = null, $property) {
+    public function getAllValuesInt(?Node $node = null, $property) {
         $allValues = $this->getAllValuesString($node, $property);
         $output = [];
         foreach ($allValues as $a)
@@ -316,7 +316,7 @@ class NodeReader {
      * @param string|object $property The property to read.
      * @return array<bool>
      */
-    public function getAllValuesFloat(Node $node = null, $property) {
+    public function getAllValuesFloat(?Node $node = null, $property) {
         $allValues = $this->getAllValuesString($node, $property);
         $output = [];
         foreach ($allValues as $a)
@@ -333,7 +333,7 @@ class NodeReader {
      * @param string|object $property The property to read.
      * @return array<IRI>
      */
-    public function getAllValuesIRI(Node $node = null, $property) {
+    public function getAllValuesIRI(?Node $node = null, $property) {
         $allValues = $this->getAllValues($node, $property);
         $output = [];
         foreach ($allValues as $a)
@@ -351,7 +351,7 @@ class NodeReader {
      * @param string|object $property The property to read.
      * @return array<Node>
      */
-    public function getAllValuesNode(Node $node = null, $property) {
+    public function getAllValuesNode(?Node $node = null, $property) {
         $allValues = $this->getAllValues($node, $property);
         $output = [];
         foreach ($allValues as $a)

CloudObjects/SDK/ObjectRetriever.php

@@ -206,7 +206,7 @@ class ObjectRetriever implements CustomCacheAndLogInterface {
 	/**
 	 * Get an object description and return a CloudObject.
 	 */
-	public function getCloudObject(IRI $coid) : CloudObject {
+	public function getCloudObject(IRI $coid) : ?CloudObject {
 		$node = $this->getObjectNode($coid);
 		if (!$node) {
 			// Object not found
@@ -239,7 +239,7 @@ class ObjectRetriever implements CustomCacheAndLogInterface {
 	 * @param IRI $coid COID of the object
 	 * @return Node|null
 	 */
-	public function getObjectNode(IRI $coid) : Node {
+	public function getObjectNode(IRI $coid) : ?Node {
 		if (!COIDParser::isValidCOID($coid))
 			throw new Exception("Not a valid COID.");
 
@@ -536,7 +536,7 @@ class ObjectRetriever implements CustomCacheAndLogInterface {
 	 * @deprecated Use getAuthenticatingNamespaceObjectNode() instead
 	 * @return Node
 	 */
-	public function getAuthenticatingNamespaceObject() : Node {
+	public function getAuthenticatingNamespaceObject() : ?Node {
 		return $this->getObject($this->assertAuthenticatingNamespaceAndGetId());
 	}
 
@@ -546,7 +546,7 @@ class ObjectRetriever implements CustomCacheAndLogInterface {
 	 * 
 	 * @return Node
 	 */
-	public function getAuthenticatingNamespaceObjectNode() : Node {
+	public function getAuthenticatingNamespaceObjectNode() : ?Node {
 		return $this->getObject($this->assertAuthenticatingNamespaceAndGetId());
 	}
 
@@ -556,7 +556,7 @@ class ObjectRetriever implements CustomCacheAndLogInterface {
 	 * 
 	 * @return CloudObject
 	 */
-	public function getAuthenticatingNamespaceCloudObject() : CloudObject {
+	public function getAuthenticatingNamespaceCloudObject() : ?CloudObject {
 		return $this->getCloudObject($this->assertAuthenticatingNamespaceAndGetId());
 	}
 

CloudObjects/SDK/ObjectRetrieverFacade.php

@@ -0,0 +1,80 @@
+<?php
+
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+namespace CloudObjects\SDK;
+
+use Exception;
+use ML\IRI\IRI;
+use ML\JsonLD\Node;
+
+/**
+ * Static facade for ObjectRetriever. Call setObjectRetriever() once to
+ * initialize; all subsequent static calls are forwarded to that instance.
+ */
+class ObjectRetrieverFacade {
+
+	private static ?ObjectRetriever $instance = null;
+
+	public static function setObjectRetriever(ObjectRetriever $retriever) : void {
+		self::$instance = $retriever;
+	}
+
+	private static function getInstance() : ObjectRetriever {
+		if (self::$instance === null)
+			throw new Exception('ObjectRetrieverFacade has not been initialized. Call setObjectRetriever() first.');
+
+		return self::$instance;
+	}
+
+	public static function setDefaultReader(NodeReader $reader) : ObjectRetriever {
+		return self::getInstance()->setDefaultReader($reader);
+	}
+
+	public static function getDefaultReader() : NodeReader {
+		return self::getInstance()->getDefaultReader();
+	}
+
+	public static function getClient() {
+		return self::getInstance()->getClient();
+	}
+
+	public static function getCloudObject(IRI $coid) : ?CloudObject {
+		return self::getInstance()->getCloudObject($coid);
+	}
+
+	public static function getObjectNode(IRI $coid) : ?Node {
+		return self::getInstance()->getObjectNode($coid);
+	}
+
+	public static function fetchObjectsInNamespaceWithType(IRI $namespaceCoid, $type) : array {
+		return self::getInstance()->fetchObjectsInNamespaceWithType($namespaceCoid, $type);
+	}
+
+	public static function fetchAllObjectsInNamespace(IRI $namespaceCoid) : array {
+		return self::getInstance()->fetchAllObjectsInNamespace($namespaceCoid);
+	}
+
+	public static function getCOIDListForNamespace(IRI $namespaceCoid) : array {
+		return self::getInstance()->getCOIDListForNamespace($namespaceCoid);
+	}
+
+	public static function getCOIDListForNamespaceWithType(IRI $namespaceCoid, $type) : array {
+		return self::getInstance()->getCOIDListForNamespaceWithType($namespaceCoid, $type);
+	}
+
+	public static function getAttachment(IRI $coid, $filename) {
+		return self::getInstance()->getAttachment($coid, $filename);
+	}
+
+	public static function getAuthenticatingNamespaceObjectNode() : ?Node {
+		return self::getInstance()->getAuthenticatingNamespaceObjectNode();
+	}
+
+	public static function getAuthenticatingNamespaceCloudObject() : ?CloudObject {
+		return self::getInstance()->getAuthenticatingNamespaceCloudObject();
+	}
+
+}

CloudObjects/SDK/WebAPI/APIClientFactory.php

@@ -217,7 +217,7 @@ class APIClientFactory {
      * @param ObjectRetriever $objectRetriever An initialized and authenticated object retriever.
      * @param IRI|null $namespaceCoid The namespace of the API client. Used to retrieve credentials. If this parameter is not provided, the namespace provided with the "auth_ns" configuration option from the object retriever is used.
      */
-    public function __construct(ObjectRetriever $objectRetriever, IRI $namespaceCoid = null) {
+    public function __construct(ObjectRetriever $objectRetriever, ?IRI $namespaceCoid = null) {
         $this->objectRetriever = $objectRetriever;
         $this->namespace = isset($namespaceCoid)
             ? $objectRetriever->getObjectNode($namespaceCoid)

composer.json

@@ -19,9 +19,12 @@
 		}
 	],
 	"autoload": {
-		"psr-0": {
-			"CloudObjects\\SDK" : ""
-		}
+		"psr-4": {
+			"CloudObjects\\SDK\\" : "CloudObjects/SDK/"
+		},
+		"files": [
+			"functions.php"
+		]
 	},
 	"require-dev" : {
 		"phpunit/phpunit": "^10",

functions.php

@@ -0,0 +1,23 @@
+<?php
+
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+use ML\IRI\IRI;
+use CloudObjects\SDK\CloudObject,
+    CloudObjects\SDK\ObjectRetrieverFacade;
+
+if (!function_exists('cloudobjects_get_object')) {
+    /**
+     * Retrieve a CloudObject by COID. Accepts a COID as an IRI object or a string.
+     */
+    function cloudobjects_get_object($coid) : ?CloudObject {
+        if (is_string($coid))
+            $coid = new IRI($coid);
+        elseif (!($coid instanceof IRI))
+            throw new InvalidArgumentException('COID must be a string or an IRI object.');
+
+        return ObjectRetrieverFacade::getCloudObject($coid);
+    }
+}

tests/OfflineTests/FunctionsTest.php

@@ -0,0 +1,63 @@
+<?php
+
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+namespace CloudObjects\SDK;
+
+use ML\IRI\IRI;
+use ReflectionProperty,
+    InvalidArgumentException;
+
+class FunctionsTest extends \PHPUnit\Framework\TestCase {
+
+    protected function setUp(): void {
+        $prop = new ReflectionProperty(ObjectRetrieverFacade::class, 'instance');
+        $prop->setAccessible(true);
+        $prop->setValue(null, null);
+    }
+
+    private function makeMockRetrieverReturning(?CloudObject $object) : ObjectRetriever {
+        $mock = $this->createMock(ObjectRetriever::class);
+        $mock->method('getCloudObject')->willReturn($object);
+        return $mock;
+    }
+
+    public function testAcceptsIRI(): void {
+        $coid = new IRI('coid://cloudobjects.io');
+        $mockObject = $this->createMock(CloudObject::class);
+
+        $mockRetriever = $this->createMock(ObjectRetriever::class);
+        $mockRetriever->expects($this->once())
+            ->method('getCloudObject')
+            ->with($coid)
+            ->willReturn($mockObject);
+
+        ObjectRetrieverFacade::setObjectRetriever($mockRetriever);
+
+        $this->assertSame($mockObject, cloudobjects_get_object($coid));
+    }
+
+    public function testConvertsStringToIRI(): void {
+        $mockObject = $this->createMock(CloudObject::class);
+
+        $mockRetriever = $this->createMock(ObjectRetriever::class);
+        $mockRetriever->expects($this->once())
+            ->method('getCloudObject')
+            ->with($this->callback(fn($arg) => $arg instanceof IRI && (string)$arg === 'coid://cloudobjects.io'))
+            ->willReturn($mockObject);
+
+        ObjectRetrieverFacade::setObjectRetriever($mockRetriever);
+
+        $this->assertSame($mockObject, cloudobjects_get_object('coid://cloudobjects.io'));
+    }
+
+    public function testThrowsOnInvalidArgumentType(): void {
+        ObjectRetrieverFacade::setObjectRetriever($this->makeMockRetrieverReturning(null));
+
+        $this->expectException(InvalidArgumentException::class);
+        cloudobjects_get_object(42);
+    }
+
+}

tests/OfflineTests/NodeReaderMockTest.php

@@ -126,6 +126,15 @@ class NodeReaderMockTest extends \PHPUnit\Framework\TestCase {
         $this->assertEquals('coid://cloudobjects.io/Public', $object->getNode('co:isVisibleTo')->getId());
     }
 
+    public function testConstants() {
+        $coid = new IRI('coid://cloudobjects.io');
+        $this->useRootResourceMock();
+        $object = $this->retriever->getCloudObject($coid);
+
+        $this->assertEquals('6-fbea0c90b2c5e5300e4039ed99be9b2d', $object->getRevision());
+        $this->assertEquals('CloudObjects', $object->getLabel());
+    }
+
     public function testGetAllValuesString1() {
         $coid = new IRI('coid://cloudobjects.io');
         $this->useRootResourceMock();

tests/OfflineTests/ObjectRetrieverFacadeTest.php

@@ -0,0 +1,76 @@
+<?php
+
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+namespace CloudObjects\SDK;
+
+use Exception;
+use ML\IRI\IRI;
+use ML\JsonLD\Node;
+use ReflectionProperty;
+
+class ObjectRetrieverFacadeTest extends \PHPUnit\Framework\TestCase {
+
+    protected function setUp(): void {
+        $prop = new ReflectionProperty(ObjectRetrieverFacade::class, 'instance');
+        $prop->setAccessible(true);
+        $prop->setValue(null, null);
+    }
+
+    public function testThrowsExceptionBeforeInitialization(): void {
+        $this->expectException(Exception::class);
+        ObjectRetrieverFacade::getObjectNode(new IRI('coid://cloudobjects.io'));
+    }
+
+    public function testForwardsGetObjectNodeToInstance(): void {
+        $coid = new IRI('coid://cloudobjects.io');
+        $mockNode = $this->createMock(Node::class);
+
+        $mockRetriever = $this->createMock(ObjectRetriever::class);
+        $mockRetriever->expects($this->once())
+            ->method('getObjectNode')
+            ->with($coid)
+            ->willReturn($mockNode);
+
+        ObjectRetrieverFacade::setObjectRetriever($mockRetriever);
+
+        $this->assertSame($mockNode, ObjectRetrieverFacade::getObjectNode($coid));
+    }
+
+    public function testForwardsGetCloudObjectToInstance(): void {
+        $coid = new IRI('coid://cloudobjects.io');
+        $mockCloudObject = $this->createMock(CloudObject::class);
+
+        $mockRetriever = $this->createMock(ObjectRetriever::class);
+        $mockRetriever->expects($this->once())
+            ->method('getCloudObject')
+            ->with($coid)
+            ->willReturn($mockCloudObject);
+
+        ObjectRetrieverFacade::setObjectRetriever($mockRetriever);
+
+        $this->assertSame($mockCloudObject, ObjectRetrieverFacade::getCloudObject($coid));
+    }
+
+    public function testReplacingRetrieverUsesNewInstance(): void {
+        $coid = new IRI('coid://cloudobjects.io');
+        $mockNode = $this->createMock(Node::class);
+
+        $firstRetriever = $this->createMock(ObjectRetriever::class);
+        $firstRetriever->expects($this->never())->method('getObjectNode');
+
+        $secondRetriever = $this->createMock(ObjectRetriever::class);
+        $secondRetriever->expects($this->once())
+            ->method('getObjectNode')
+            ->with($coid)
+            ->willReturn($mockNode);
+
+        ObjectRetrieverFacade::setObjectRetriever($firstRetriever);
+        ObjectRetrieverFacade::setObjectRetriever($secondRetriever);
+
+        $this->assertSame($mockNode, ObjectRetrieverFacade::getObjectNode($coid));
+    }
+
+}