1 files changed, 159 insertions, 0 deletions
diff --git a/vendor/spomky-labs/otphp/src/TOTP.php b/vendor/spomky-labs/otphp/src/TOTP.php
new file mode 100644
index 000000000..588b37f17
--- /dev/null
+++ b/vendor/spomky-labs/otphp/src/TOTP.php
@@ -0,0 +1,159 @@
+<?php
+
+declare(strict_types=1);
+
+/*
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2014-2019 Spomky-Labs
+ *
+ * This software may be modified and distributed under the terms
+ * of the MIT license.  See the LICENSE file for details.
+ */
+
+namespace OTPHP;
+
+use Assert\Assertion;
+use function Safe\ksort;
+
+final class TOTP extends OTP implements TOTPInterface
+{
+    protected function __construct(?string $secret, int $period, string $digest, int $digits, int $epoch = 0)
+    {
+        parent::__construct($secret, $digest, $digits);
+        $this->setPeriod($period);
+        $this->setEpoch($epoch);
+    }
+
+    public static function create(?string $secret = null, int $period = 30, string $digest = 'sha1', int $digits = 6, int $epoch = 0): TOTPInterface
+    {
+        return new self($secret, $period, $digest, $digits, $epoch);
+    }
+
+    protected function setPeriod(int $period): void
+    {
+        $this->setParameter('period', $period);
+    }
+
+    public function getPeriod(): int
+    {
+        return $this->getParameter('period');
+    }
+
+    private function setEpoch(int $epoch): void
+    {
+        $this->setParameter('epoch', $epoch);
+    }
+
+    public function getEpoch(): int
+    {
+        return $this->getParameter('epoch');
+    }
+
+    public function at(int $timestamp): string
+    {
+        return $this->generateOTP($this->timecode($timestamp));
+    }
+
+    public function now(): string
+    {
+        return $this->at(time());
+    }
+
+    /**
+     * If no timestamp is provided, the OTP is verified at the actual timestamp.
+     */
+    public function verify(string $otp, ?int $timestamp = null, ?int $window = null): bool
+    {
+        $timestamp = $this->getTimestamp($timestamp);
+
+        if (null === $window) {
+            return $this->compareOTP($this->at($timestamp), $otp);
+        }
+
+        return $this->verifyOtpWithWindow($otp, $timestamp, $window);
+    }
+
+    private function verifyOtpWithWindow(string $otp, int $timestamp, int $window): bool
+    {
+        $window = abs($window);
+
+        for ($i = 0; $i <= $window; ++$i) {
+            $next = $i * $this->getPeriod() + $timestamp;
+            $previous = -$i * $this->getPeriod() + $timestamp;
+            $valid = $this->compareOTP($this->at($next), $otp) ||
+                $this->compareOTP($this->at($previous), $otp);
+
+            if ($valid) {
+                return true;
+            }
+        }
+
+        return false;
+    }
+
+    private function getTimestamp(?int $timestamp): int
+    {
+        $timestamp = $timestamp ?? time();
+        Assertion::greaterOrEqualThan($timestamp, 0, 'Timestamp must be at least 0.');
+
+        return $timestamp;
+    }
+
+    public function getProvisioningUri(): string
+    {
+        $params = [];
+        if (30 !== $this->getPeriod()) {
+            $params['period'] = $this->getPeriod();
+        }
+
+        if (0 !== $this->getEpoch()) {
+            $params['epoch'] = $this->getEpoch();
+        }
+
+        return $this->generateURI('totp', $params);
+    }
+
+    private function timecode(int $timestamp): int
+    {
+        return (int) floor(($timestamp - $this->getEpoch()) / $this->getPeriod());
+    }
+
+    /**
+     * @return array<string, mixed>
+     */
+    protected function getParameterMap(): array
+    {
+        $v = array_merge(
+            parent::getParameterMap(),
+            [
+                'period' => function ($value): int {
+                    Assertion::greaterThan((int) $value, 0, 'Period must be at least 1.');
+
+                    return (int) $value;
+                },
+                'epoch' => function ($value): int {
+                    Assertion::greaterOrEqualThan((int) $value, 0, 'Epoch must be greater than or equal to 0.');
+
+                    return (int) $value;
+                },
+            ]
+        );
+
+        return $v;
+    }
+
+    /**
+     * @param array<string, mixed> $options
+     */
+    protected function filterOptions(array &$options): void
+    {
+        parent::filterOptions($options);
+
+        if (isset($options['epoch']) && 0 === $options['epoch']) {
+            unset($options['epoch']);
+        }
+
+        ksort($options);
+    }
+}