WIP: Create classes for SAML entities + metadata

phpcs.xml

@@ -36,6 +36,7 @@
         <exclude-pattern>**/HTTPRedirectTest.php</exclude-pattern>
         <exclude-pattern>**/SOAPTest.php</exclude-pattern>
         <exclude-pattern>tests/SAML2/Assertion/Validation/AssertionValidatorTest.php</exclude-pattern>
+        <exclude-pattern>tests/SAML2/Entity/ServiceProviderTest.php</exclude-pattern>
         <exclude-pattern>tests/SAML2/XML/saml/AssertionTest.php</exclude-pattern>
         <exclude-pattern>tests/SAML2/XML/saml/AttributeValueTest.php</exclude-pattern>
         <exclude-pattern>tests/SAML2/XML/saml/AuthnContextTest.php</exclude-pattern>

src/Exception/ConstraintValidationFailedException.php

@@ -0,0 +1,12 @@
+<?php
+
+declare(strict_types=1);
+
+namespace SimpleSAML\SAML2\Exception;
+
+/**
+ * Exception to be raised when validation of a constraint fails.
+ */
+class ConstraintViolationFailedException extends RuntimeException
+{
+}

src/Exception/MetadataNotFoundException.php

@@ -0,0 +1,12 @@
+<?php
+
+declare(strict_types=1);
+
+namespace SimpleSAML\SAML2\Exception;
+
+/**
+ * Exception to be raised when no metadata was found for a specific entityID
+ */
+class MetadataNotFoundException extends RuntimeException
+{
+}