add signup ip support

README.md

@@ -18,6 +18,8 @@ By default publapi listens on 127.0.0.1:3000. You can change the port with the e
 
 Additionally, you need to set the variable PUBLAPI_EMAIL_SHOUTRRRURL and PUBLAPI_NOTIFY_SHOUTRRRURL in order for signup notifications to work. URL Format can be found at https://containrrr.dev/shoutrrr/v0.5.
 
+You can also set PUBLAPI_SIGNUP_IP to make sure signup requests can only be made from one IP.
+
 ## Usage
 Currently, PublAPI has only two routes, /users and /signup.
 

pages/signup.go

@@ -11,7 +11,13 @@ import (
 
 // SignupPage is the signup page handler
 func SignupPage(c *fiber.Ctx) error {
-
+	SignupIP, SignupIPExists := os.LookupEnv("PUBLAPI_SIGNUP_IP")
+	if SignupIPExists == true {
+		if c.IP() != SignupIP {
+			log.Info("Request made from invalid IP: ", c.IP())
+			return c.SendStatus(fiber.StatusForbidden)
+		}
+	}
 	username := c.FormValue("username")
 	email := c.FormValue("email")
 	ssh := c.FormValue("ssh")