From 74f438afad4d51793ee1eed272167f70d871585a Mon Sep 17 00:00:00 2001
From: Ben Visness <ben@bvisness.me>
Date: Mon, 21 Aug 2023 21:19:35 -0400
Subject: [PATCH] miscellaneous characters from my keyboard

---
 src/website/auth.go | 14 +++++++++++---
 1 file changed, 11 insertions(+), 3 deletions(-)

diff --git a/src/website/auth.go b/src/website/auth.go
index 274cdf2..117c82c 100644
--- a/src/website/auth.go
+++ b/src/website/auth.go
@@ -202,9 +202,7 @@ func RegisterNewUserSubmit(c *RequestContext) ResponseData {
 	}
 
 	c.Perf.StartBlock("SQL", "Check blacklist")
-	// TODO(asaf): Check email against blacklist
-	blacklisted := false
-	if blacklisted {
+	if emailIsBlacklisted(emailAddress) {
 		// NOTE(asaf): Silent rejection so we don't allow attackers to harvest emails.
 		return c.Redirect(hmnurl.BuildRegistrationSuccess(), http.StatusSeeOther)
 	}
@@ -882,3 +880,13 @@ func validateUsernameAndToken(c *RequestContext, username string, token string,
 func urlIsLocal(url string) bool {
 	return strings.HasPrefix(url, config.Config.BaseUrl)
 }
+
+func emailIsBlacklisted(email string) bool {
+	if strings.Count(email, ".") > 5 {
+		return true
+	}
+
+	// TODO(asaf): Actually check email against blacklist
+
+	return false
+}