From e113e2c37ed5eeaed7592f866e9cb7be1bacc5c1 Mon Sep 17 00:00:00 2001
From: Ben Klang <bklang@mojolingo.com>
Date: Fri, 27 Nov 2015 18:12:40 -0500
Subject: [PATCH] Allow restricting login to a specific team ID

---
 README.md                       | 13 +++++++++++++
 lib/ueberauth/strategy/slack.ex |  3 +++
 2 files changed, 16 insertions(+)

diff --git a/README.md b/README.md
index 7f5c84c..bfb9641 100644
--- a/README.md
+++ b/README.md
@@ -31,6 +31,19 @@
       ]
     ```
 
+    You can optionally restrict authentication by providing your team ID. [Find your Slack team ID here](https://api.slack.com/methods/auth.test/test). Note that this is NOT your team's Slack domain name!
+
+    ```elixir
+    config :ueberauth, Ueberauth,
+      providers: [
+        slack: [
+          {Ueberauth.Strategy.Slack, [
+            team: "0ABCDEF"
+          ]}
+        ]
+      ]
+    ```
+
 1.  Update your provider configuration:
 
     ```elixir
diff --git a/lib/ueberauth/strategy/slack.ex b/lib/ueberauth/strategy/slack.ex
index c92eab8..bfdee2f 100644
--- a/lib/ueberauth/strategy/slack.ex
+++ b/lib/ueberauth/strategy/slack.ex
@@ -31,6 +31,9 @@ defmodule Ueberauth.Strategy.Slack do
     if conn.params["state"], do: opts = Keyword.put(opts, :state, conn.params["state"])
     callback_url = callback_url(conn)
 
+    team = option(conn, :team)
+    if team, do: opts = Keyword.put(opts, :team, team)
+
     if String.ends_with?(callback_url, "?"), do: callback_url = String.slice(callback_url, 0..-2)
 
     opts = Keyword.put(opts, :redirect_uri, callback_url)