Created entity to persist rest tokens

.env.dist

@@ -8,3 +8,7 @@ SHORTCODE_CHARS=
 DB_USER=
 DB_PASSWORD=
 DB_NAME=
+
+# Rest authentication
+REST_USER=
+REST_PASSWORD=

config/autoload/rest.global.php

@@ -0,0 +1,9 @@
+<?php
+return [
+
+    'rest' => [
+        'username' => getenv('REST_USER'),
+        'password' => getenv('REST_PASSWORD'),
+    ],
+
+];

src/Entity/RestToken.php

@@ -0,0 +1,89 @@
+<?php
+namespace Acelaya\UrlShortener\Entity;
+
+use Doctrine\ORM\Mapping as ORM;
+
+/**
+ * Class RestToken
+ * @author
+ * @link
+ *
+ * @ORM\Entity()
+ * @ORM\Table(name="rest_tokens")
+ */
+class RestToken extends AbstractEntity
+{
+    /**
+     * The default interval is 20 minutes
+     */
+    const DEFAULT_INTERVAL = 'PT20M';
+
+    /**
+     * @var \DateTime
+     * @ORM\Column(type="datetime", name="expiration_date", nullable=false)
+     */
+    protected $expirationDate;
+    /**
+     * @var string
+     * @ORM\Column(nullable=false)
+     */
+    protected $token;
+
+    public function __construct()
+    {
+        $this->updateExpiration();
+    }
+
+    /**
+     * @return \DateTime
+     */
+    public function getExpirationDate()
+    {
+        return $this->expirationDate;
+    }
+
+    /**
+     * @param \DateTime $expirationDate
+     * @return $this
+     */
+    public function setExpirationDate($expirationDate)
+    {
+        $this->expirationDate = $expirationDate;
+        return $this;
+    }
+
+    /**
+     * @return string
+     */
+    public function getToken()
+    {
+        return $this->token;
+    }
+
+    /**
+     * @param string $token
+     * @return $this
+     */
+    public function setToken($token)
+    {
+        $this->token = $token;
+        return $this;
+    }
+
+    /**
+     * @return bool
+     */
+    public function isExpired()
+    {
+        return new \DateTime() > $this->expirationDate;
+    }
+
+    /**
+     * Updates the expiration of the token, setting it to the default interval in the future
+     * @return $this
+     */
+    public function updateExpiration()
+    {
+        return $this->setExpirationDate((new \DateTime())->add(new \DateInterval(self::DEFAULT_INTERVAL)));
+    }
+}