Add class for Server configuration.

Author: Potherca

src/Config/Server.php

@@ -0,0 +1,91 @@
+<?php declare(strict_types=1);
+
+namespace Pdsinterop\Solid\Auth\Config;
+
+use JsonSerializable;
+use Pdsinterop\Solid\Auth\Enum\OpenId\OpenIdConnectMetadata as OidcMeta;
+use Pdsinterop\Solid\Auth\Exception\LogicException;
+
+class Server implements JsonSerializable
+{
+    ////////////////////////////// CLASS PROPERTIES \\\\\\\\\\\\\\\\\\\\\\\\\\\\
+
+    /** @var array */
+    private $data;
+    /** @var bool */
+    private $strict;
+
+    //////////////////////////// GETTERS AND SETTERS \\\\\\\\\\\\\\\\\\\\\\\\\\\
+
+    private function getRecommended() : array
+    {
+        return [
+            OidcMeta::CLAIMS_SUPPORTED,
+            OidcMeta::REGISTRATION_ENDPOINT,
+            OidcMeta::SCOPES_SUPPORTED,
+            OidcMeta::USERINFO_ENDPOINT,
+        ];
+    }
+
+    private function getRequired() : array
+    {
+        $required = [
+            OidcMeta::AUTHORIZATION_ENDPOINT,
+            OidcMeta::ID_TOKEN_SIGNING_ALG_VALUES_SUPPORTED,
+            OidcMeta::ISSUER,
+            OidcMeta::JWKS_URI,
+            OidcMeta::RESPONSE_TYPES_SUPPORTED,
+            OidcMeta::SUBJECT_TYPES_SUPPORTED,
+        ];
+
+        if ($this->strict === true) {
+            $required = array_merge($required, $this->getRecommended());
+        }
+
+        return $required;
+    }
+
+    //////////////////////////////// PUBLIC API \\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\
+
+    final public function __construct(array $data, bool $strict = false)
+    {
+        $this->data = array_filter($data, [OidcMeta::class, 'has']);
+        $this->strict = $strict;
+    }
+
+    final public function __toString() : string
+    {
+        return (string) json_encode($this);
+    }
+
+    /**
+     * @return array
+     *
+     * @throws LogicException for missing required properties
+     */
+    final public function jsonSerialize() : array
+    {
+        $data = $this->data;
+
+        if ($this->validate() === false) {
+            $missing = $this->checkForMissing($data, $this->getRequired());
+            throw new LogicException('Required properties have not been set: ' . implode(', ', $missing));
+        }
+
+        return $data;
+    }
+
+    final public function validate() : bool
+    {
+        return $this->checkForMissing($this->data, $this->getRequired()) === [];
+    }
+
+    ////////////////////////////// UTILITY METHODS \\\\\\\\\\\\\\\\\\\\\\\\\\\\\
+
+    private function checkForMissing(array $data, array $required) : array
+    {
+        $available = array_keys($data);
+
+        return array_diff($required, $available);
+    }
+}