Permutations are the possible combinations of elements in a set. In addition, I added a few enhancements, including the ability of the recursive algorithm to apply the permutations to a string of characters, input by the user, and return each permutation of the input string back to the user. To rewrite a word descrambler program in C# 3.0, originally created a number of years ago in VBA for Microsoft Excel, I used one of article’s three Java-based algorithms, the recursive algorithm, rewriting in C#. The article, from Interactive Mathematics Miscellany and Puzzles, introduces three separate algorithms all capable of generating a list of permutations for a given set of elements. For example, assuming a progressive web app is leveraging a SPA framework then it could store this in local storage while a traditional web app framework would store it in server-side session.Recently, while searching for a method to descramble a string of characters, I came across an article by Alexander Bogomolny, entitled ‘ Counting and Listing All Permutations’. Your application type determines the best place to keep the data that allows your app to validate the response. If you receive a response with a state that does not match, you were likely been the target of an attack because this is either a response for an unsolicited request or someone trying to forge the real response. Using this method, you send a random value when starting an authentication request and validate the received value when processing the response (this implies you store something on the client application side, in session or another medium, that allows you to perform the validation). To learn more, read Prevent Attacks and Redirect Users with OAuth0 2.0 State Parameters. This solution takes a little more work to implement but guarantees that the application has the information it needs once the redirect is complete.
Once your user has authenticated with Auth0 it is up to your application to determine how long it persists this session.Īs an alternative method, you can create a deep link using the state parameter which your callback would interpret to determine a forwarding path. You should store these tokens in your application and reference them using an identifier passed back to the browser using a secure cookie.
Throughout the user session, your application may need to request additional tokens or renew expired ones. These settings apply to all applications within your tenant and should be configured to align with the security model that matches your use case.Īpplication Session: Your application must also maintain a concept of a session. The session_lifetime is the maximum duration that the session is allowed to remain alive. The idle_session_lifetime is how long the session will remain alive without interaction. There are two tenant settings that determine the length of the Auth0 Session: This session is maintained by Auth0 and referenced as a cookie bound to your tenant domain (or CNAME). Each serves a separate purpose and requires some consideration to achieve the desired user experience.Īuth0-provided SSO Session: Auth0 provides a session for enabling Single Sign On (SSO) to allow your user to maintain an authentication session without being prompted for credentials more than once.
There are two separate user sessions initiated in this situation. This is a simple solution to implement, however, it can cause issues in cases where a cookie does not persist. You can use a cookie or the browser session to store a return URL value.
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