flaskapp.py

@@ -33,6 +33,9 @@ def register():
             flash("Illegal Character in Username. Please choose a different one one.")
         elif response == "ERR_NICKNAMEINUSE":
             flash("Username already taken. Please choose a different one!")
+        elif response == "CAP_REFUSED":
+            flash("This IRCd doesn't support the draft/account-registration capability")
+            return redirect(webchat_url)
         elif response == "SUCCESS":
             return redirect(webchat_url)
         else:

forms.py

@@ -4,6 +4,7 @@ from wtforms.validators import DataRequired, Length, EqualTo
 
 
 class RegistrationForm(FlaskForm):
+    # clarify that it conforms with casemapping on ircd.
     username = StringField('Username', validators=[DataRequired(), Length(min=1, max=32)])
     password = PasswordField('Password', validators=[DataRequired()])
     confirm_password = PasswordField('Confirm Password', validators=[DataRequired(), EqualTo('password')])

irc_register.py

@@ -59,7 +59,7 @@ def ircregister(userip, username, password, email="*"):
                 return "ERR_NICKNAMEINUSE"
             _send(irctokens.build("CAP", ["REQ", "draft/account-registration"]))
             if line.command == "CAP" and ("NAK" in line.params):
-                return "cap refused"
+                return "CAP_REFUSED"
             elif line.command == "CAP" and ("ACK" in line.params):
                 to_send = irctokens.build("CAP", ["END"])
                 _send(to_send)