From 47b7344e2efd3da385161d1a253ad139f95734c8 Mon Sep 17 00:00:00 2001
From: yggverse <yggverse@project>
Date: Fri, 2 Aug 2024 21:07:06 +0300
Subject: [PATCH] implement identity model

---
 src/Abstract/Model/Identity.php  | 77 +++++++++++++++++++++++++++++++
 src/Interface/Model/Identity.php | 40 ++++++++++++++++
 src/Model/Identity/Gemini.php    | 78 ++++++++++++++++++++++++++++++++
 3 files changed, 195 insertions(+)
 create mode 100644 src/Abstract/Model/Identity.php
 create mode 100644 src/Interface/Model/Identity.php
 create mode 100644 src/Model/Identity/Gemini.php

diff --git a/src/Abstract/Model/Identity.php b/src/Abstract/Model/Identity.php
new file mode 100644
index 00000000..cf6027b7
--- /dev/null
+++ b/src/Abstract/Model/Identity.php
@@ -0,0 +1,77 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Yggverse\Yoda\Abstract\Model;
+
+use \Exception;
+use \OpenSSLAsymmetricKey;
+use \OpenSSLCertificate;
+use \OpenSSLCertificateSigningRequest;
+
+abstract class Identity implements \Yggverse\Yoda\Interface\Model\Identity
+{
+    // Generate a new private key
+    public static function new(
+        int $bits = self::PRIVATE_KEY_BITS,
+        int $type = self::PRIVATE_KEY_TYPE
+    ): OpenSSLAsymmetricKey
+    {
+        $key = openssl_pkey_new(
+            [
+                'private_key_bits' => $bits,
+                'private_key_type' => $type
+            ]
+        );
+
+        if ($key)
+        {
+            return $key;
+        }
+
+        throw new Exception;
+    }
+
+    // Generate a new certificate signing request (CSR)
+    public static function csr(
+        OpenSSLAsymmetricKey $key
+    ): OpenSSLCertificateSigningRequest
+    {
+        $csr = openssl_csr_new(
+            [
+                // 'commonName' => $commonName @TODO
+            ],
+            $key
+        );
+
+        if ($csr)
+        {
+            return $csr;
+        }
+
+        throw new Exception;
+    }
+
+    // Sign the CSR
+    public static function sign(
+        OpenSSLCertificateSigningRequest $csr,
+        OpenSSLCertificate|OpenSSLAsymmetricKey|array|string $key,
+        OpenSSLCertificate|string|null $crt = null, // self-signed
+        int $days = self::CSR_SIGN_DAYS
+    ):  OpenSSLCertificate
+    {
+        $x509 = openssl_csr_sign(
+            $csr,
+            $crt,
+            $key,
+            $days
+        );
+
+        if ($x509)
+        {
+            return $x509;
+        }
+
+        throw new Exception;
+    }
+}
\ No newline at end of file
diff --git a/src/Interface/Model/Identity.php b/src/Interface/Model/Identity.php
new file mode 100644
index 00000000..4cc06cd9
--- /dev/null
+++ b/src/Interface/Model/Identity.php
@@ -0,0 +1,40 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Yggverse\Yoda\Interface\Model;
+
+use \OpenSSLAsymmetricKey;
+use \OpenSSLCertificate;
+use \OpenSSLCertificateSigningRequest;
+
+/*
+ * Certificate-based Identity API
+ *
+ */
+interface Identity
+{
+    public const CSR_SIGN_DAYS = 365;
+
+    public const PRIVATE_KEY_BITS = 2048;
+    public const PRIVATE_KEY_TYPE = OPENSSL_KEYTYPE_RSA;
+
+    // Generate new private key
+    public static function new(
+        int $bits = self::PRIVATE_KEY_BITS,
+        int $type = self::PRIVATE_KEY_TYPE
+    ): OpenSSLAsymmetricKey;
+
+    // Generate certificate signing request (CSR)
+    public static function csr(
+        OpenSSLAsymmetricKey $key
+    ): OpenSSLCertificateSigningRequest;
+
+    // Sign the CSR
+    public static function sign(
+        OpenSSLCertificateSigningRequest $csr,
+        OpenSSLCertificate|OpenSSLAsymmetricKey|array|string $key,
+        OpenSSLCertificate|string|null $crt = null, // self-signed
+        int $days = self::CSR_SIGN_DAYS
+    ):  OpenSSLCertificate;
+}
\ No newline at end of file
diff --git a/src/Model/Identity/Gemini.php b/src/Model/Identity/Gemini.php
new file mode 100644
index 00000000..4c4e413d
--- /dev/null
+++ b/src/Model/Identity/Gemini.php
@@ -0,0 +1,78 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Yggverse\Yoda\Model\Identity;
+
+use \Exception;
+use \OpenSSLAsymmetricKey;
+use \OpenSSLCertificate;
+
+class Gemini extends \Yggverse\Yoda\Abstract\Model\Identity
+{
+    // Update defaults
+    public const CSR_SIGN_DAYS = 365 * 1965; // @TODO
+
+    // Init identity variables
+    protected OpenSSLAsymmetricKey $_key;
+    protected OpenSSLCertificate $_crt;
+
+    // Init new identity
+    public function __construct(
+        ?OpenSSLAsymmetricKey $key = null,
+        ?OpenSSLCertificate $crt = null
+    ) {
+        // Init private key
+        $this->_key = $key ? $key : self::new();
+
+        // Init self-signed certificate
+        $this->_crt = $crt ? $crt : self::sign(
+            self::csr(
+                $this->_key
+            ),
+            $this->_key,
+            null,
+            self::CSR_SIGN_DAYS
+        );
+    }
+
+    // Get certificate
+    public function crt(
+        ?OpenSSLCertificate $crt = null
+    ): string
+    {
+        $pem = '';
+
+        $result = openssl_x509_export(
+            $crt ? $crt : $this->_crt,
+            $pem
+        );
+
+        if ($result)
+        {
+            return $pem;
+        }
+
+        throw new Exception;
+    }
+
+    // Get private key
+    public function key(
+        ?OpenSSLAsymmetricKey $key = null
+    ): string
+    {
+        $pem = '';
+
+        $result = openssl_pkey_export(
+            $key ? $key : $this->_key,
+            $pem
+        );
+
+        if ($result)
+        {
+            return $pem;
+        }
+
+        throw new Exception;
+    }
+}
\ No newline at end of file