From 2c79a945b66b44a749276f75263915e8c8a5fe18 Mon Sep 17 00:00:00 2001
From: Cyril David <cyril.david@auth0.com>
Date: Wed, 24 Mar 2021 16:54:18 -0700
Subject: [PATCH] rules: add simple domain allow list

Closes #187
---
 .../rule-template-simple-domain-allow-list.js | 28 +++++++++++++++++++
 internal/cli/rules.go                         |  1 +
 internal/cli/rules_embed.go                   |  3 ++
 3 files changed, 32 insertions(+)
 create mode 100644 internal/cli/data/rule-template-simple-domain-allow-list.js

diff --git a/internal/cli/data/rule-template-simple-domain-allow-list.js b/internal/cli/data/rule-template-simple-domain-allow-list.js
new file mode 100644
index 000000000..b2c3f29ae
--- /dev/null
+++ b/internal/cli/data/rule-template-simple-domain-allow-list.js
@@ -0,0 +1,28 @@
+/**
+ * @title Email domain allow list
+ * @overview Only allow access to users with specific allow list email domains.
+ * @gallery true
+ * @category access control
+ *
+ * This rule will only allow access to users with specific email domains.
+ *
+ */
+
+function emailDomainAllowList(user, context, callback) {
+  // Access should only be granted to verified users.
+  if (!user.email || !user.email_verified) {
+    return callback(new UnauthorizedError('Access denied.'));
+  }
+
+  const allowList = ['example.com', 'example.org']; //authorized domains
+  const userHasAccess = allowList.some(function (domain) {
+    const emailSplit = user.email.split('@');
+    return emailSplit[emailSplit.length - 1].toLowerCase() === domain;
+  });
+
+  if (!userHasAccess) {
+    return callback(new UnauthorizedError('Access denied.'));
+  }
+
+  return callback(null, user, context);
+}
diff --git a/internal/cli/rules.go b/internal/cli/rules.go
index dd647ac7c..e1713c858 100644
--- a/internal/cli/rules.go
+++ b/internal/cli/rules.go
@@ -43,6 +43,7 @@ var (
 		{"Empty rule", ruleTemplateEmptyRule},
 		{"Add email to access token", ruleTemplateAddEmailToAccessToken},
 		{"Check last password reset", ruleTemplateCheckLastPasswordReset},
+		{"Simple domain allow list", ruleTemplateSimpleDomainAllowList},
 		{"IP address allow list", ruleTemplateIPAddressAllowList},
 		{"IP address deny list", ruleTemplateIPAddressDenyList},
 	}
diff --git a/internal/cli/rules_embed.go b/internal/cli/rules_embed.go
index 14fc553b0..45c20f120 100644
--- a/internal/cli/rules_embed.go
+++ b/internal/cli/rules_embed.go
@@ -19,4 +19,7 @@ var (
 
 	//go:embed data/rule-template-ip-address-deny-list.js
 	ruleTemplateIPAddressDenyList string
+
+	//go:embed data/rule-template-simple-domain-allow-list.js
+	ruleTemplateSimpleDomainAllowList string
 )