Why are my session variables not being preserved using Gorilla Sessions?

Sessions Variables Not Preserved Using Gorilla Sessions

In your request for assistance with session handling using Gorilla Sessions, you described an issue where session values were not being maintained across requests.

One potential issue lies in the path you're setting for the session store. By setting the Path to /loginSession, you're limiting the session's validity to that specific path. To ensure sessions are consistent across all paths, you should set the Path to / instead:

store.Options = &sessions.Options{
    Domain:   "localhost",
    Path:     "/",
    MaxAge:   3600 * 8,
    HttpOnly: true,
}

Another point to consider is the way you're checking session values. Instead of using session.Values["email"] == nil, you should type assert the value to a string to correctly handle empty values:

if val, ok := session.Values["email"].(string); ok {
    // if val is a string
    switch val {
        case "":
            http.Redirect(res, req, "html/login.html", http.StatusFound)
        default:
            http.Redirect(res, req, "html/home.html", http.StatusFound)
    }
} else {
    // if val is not a string type
    http.Redirect(res, req, "html/login.html", http.StatusFound)
}

You should also check for errors when saving sessions:

err := sessionNew.Save(req, res)
if err != nil {
    // handle the error case
}

Finally, ensure that you're getting and validating the session before serving static files in the SessionHandler function:

func SessionHandler(res http.ResponseWriter, req *http.Request) {
    session, err := store.Get(req, "loginSession")
    if err != nil {
        // Handle the error
    }

    if session.Values["email"] == nil {
        http.Redirect(res, req, "html/login.html", http.StatusFound)
    } else {
        http.Redirect(res, req, "html/home.html", http.StatusFound)
    }
}

By addressing these issues, you should be able to ensure that session variables are correctly preserved across requests using Gorilla Sessions.

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