Describe the issue:

When the hostname (Eg: "test.gov.rs") of WSO2 IS includes a domain that is in the Public Suffix List [1], the localization fails in the webapps. This is because the "ui_lang" cookie is not being set correctly due to browser restrictions [2] against setting cookies for domains in the Public Suffix List.

When the domain is extracted using the extractDomainFromHost() method [3] and if the domain is in the Public Suffix List (Eg: "gov.rs"), setting the cookie is restricted by the browser. We need to check if a domain is in the Public Suffix List before setting the cookie against it.

[1] https://publicsuffix.org/list/public_suffix_list.dat
[2] https://publicsuffix.org/learn/
[3] https://github.com/wso2/identity-apps/blob/d2b06cbf70f3ccf5857d17711f247715ba542783/identity-apps-core/apps/authentication-portal/src/main/webapp/includes/language-switcher.jsp#L66

How to reproduce:

1. Update the following configurations in the <IS_HOME>/repository/conf/deployment.toml file and start an IS 7.0.0 server:

[server]
hostname = "test.gov.rs"

[transport.https.properties]
proxyPort = "443" 
port = "443"

2. Add the following entry to the /etc/hosts file:

127.0.0.1 test.gov.rs

3. Open https://test.gov.rs/console in the browser and try to switch the language in the login page. The language switcher will not work since the "ui_lang" cookie is not being set.

Expected behavior:
The "ui_lang" cookie should be set correctly

Environment information:

• Product Version: IS 7.0.0
• OS: Mac
• Database: H2
• Userstore: JDBC

Optional Fields

Related issues:
#18315