[WIP] Add Slack accestoken and code functions

src/Auth/OAuth/Slack.php

@@ -0,0 +1,125 @@
+<?php
+
+namespace Auth\OAuth;
+
+use Auth\OAuth;
+
+class Slack extends OAuth
+{
+    /**
+     * @var array
+     */
+    protected $user = [];
+
+    /**
+     * @return string
+     */
+    public function getName():string
+    {
+        return 'slack';
+    }
+
+    /**
+     * @return string
+     */
+    public function getLoginURL():string
+    {
+        return 'https://slack.com/oauth/authorize'.
+            '?client_id='.urlencode($this->appID).
+            '&scope='.urlencode("identity.avatar,identity.basic,identity.email,identity.team").
+            '&redirect_uri='.urlencode($this->callback);
+    }
+
+    /**
+     * @param string $code
+     *
+     * @return string
+     */
+    public function getAccessToken(string $code):string
+    {
+        $accessToken = $this->request(
+            'GET',
+            'https://slack.com/api/oauth.access'.
+            '?client_id='.urlencode($this->appID).
+            '&client_secret='.urlencode($this->appSecret).
+            '&redirect_uri='.urlencode($this->callback).
+            '&code='.urlencode($code)
+        );
+
+        $accessToken = json_decode($accessToken, true); //
+
+        if (isset($accessToken['access_token'])) {
+            return $accessToken['access_token'];
+        }
+
+        return '';
+    }
+
+    /**
+     * @param string $accessToken
+     *
+     * @return string
+     */
+    public function getUserID(string $accessToken):string
+    {
+        $user = $this->getUser($accessToken);
+
+        if (isset($user['user']['id'])) {
+            return $user['user']['id'];
+        }
+
+        return '';
+    }
+
+    /**
+     * @param string $accessToken
+     *
+     * @return string
+     */
+    public function getUserEmail(string $accessToken):string
+    {
+        $user = $this->getUser($accessToken);
+
+        if (isset($user['user']['email'])) {
+            return $user['user']['email'];
+        }
+
+        return '';
+    }
+
+    /**
+     * @param string $accessToken
+     *
+     * @return string
+     */
+    public function getUserName(string $accessToken):string
+    {
+        $user = $this->getUser($accessToken);
+
+        if (isset($user['user']['name'])) {
+            return $user['user']['name'];
+        }
+
+        return '';
+    }
+
+    /**
+     * @param string $accessToken
+     *
+     * @return array
+     */
+    protected function getUser(string $accessToken):array
+    {
+        if (empty($this->user)) {
+            $user = $this->request(
+                'GET',
+                'https://slack.com/api/users.identity&token='.urlencode($accessToken));
+
+            $this->user = json_decode($user, true);
+        }
+
+        return $this->user;
+    }
+}
+
+//http://localhost:8080/v1/auth/oauth/slack?project=5d94eda5e2b8a&success=http://localhost:8080/?success=1&failure=http://localhost:8080/auth/signin?failure=2