https://id.so-net.ne.jp/iam/auth/resources/erbjw/login/so-net/js/error_page_handler.js

1function isAlreadyLoggedInPage() {
2    let title = document.querySelector('.theme-main__title');
3    if (title != null) {
4        if (title.textContent.includes("既にログインしています")) {
5            return true
6        }
7    }
8    return false
9}
10
11function getRedirectUri() {
12    console.log("Running getSonetUrlParam");
13    let state = new URLSearchParams(window.location.search).get('state');
14    console.log(state);
15    const sonetLoginSession = JSON.parse(sessionStorage.getItem("sonet_login_session"));
16    if (state == null) {
17        state = sonetLoginSession.state;
18    }
19    if (sonetLoginSession != null) {
20        if (sonetLoginSession.redirect_uri != null && state != null) {
21            return sonetLoginSession.redirect_uri + "?alreadyloggedin=true&state=" + state;
22        }
23    }
24    return null;
25}
26
27function redirect(url) {
28    console.log("Redirect:" + url);
29    if (url != null) location.href = url;
30}
31
32function handleErrorPage() {
33    if (isAlreadyLoggedInPage()) {
34        setTimeout(function() {
35            redirect(getRedirectUri());
36        }, 5000);
37    }
38}