I am using Struts2 framework to implement the MVC architecture in my Web application. While allowing the user to obtain an ID-specific session, I need to take the username and password from a JSP form. Instead of passing this data to the Action class directly, I want to check the validity of the values in an Interceptor and then check or continue the flow depending on business logic-specific criteria.
Hence, my quest is to obtain the user data from the JSP form in the Interceptor. What is (if there's any) way to do that?
Thanks in advance!
If you are validating the username and password through a call to a DB or another service,it would be better to have a separate action for it.
However subsequent calls to business logic can be prehandled via the request context in the interceptor itself.
Related
I have a web app that uses a Java Bean for login functions right now and all of the JSP pages check the Bean to make sure the user is logged in. I am also introducing some AJAX functionality now with servlets and I see that of course those exchanges don't check authentication. I'm wondering how I should handle this. For example, I don't want someone to be able to logout, hit back button, then submit something with the AJAX functions successfully.
I can't access the bean from the servlet to check the login (totally wrong context and static vs non-static). I guess I could set a flag with the user entry in the database table denoting logged in or not. Then I can detect timeout logoffs and update the flag as well. But that way would require extra database accesses every time something is done. It would duplicate functionality in some way, but I guess I could perhaps use that just for the AJAX stuff. One difference with that would be the user would not be able to be logged in on multiple places at once as currently.
How is this kind of thing normally done?
Thanks for any help!
You could use session to store that flag instead of the database, and when the user logs out you should remove that flag and destroy the session. In login method
HttpSession session = req.getSession(true);
session.setAttribute("loggedIn",true)
And in your AJAX code
if(eq.getSession(true).getAttribute("loggedIn")==true)
doWork();
else
error("not logged in");
The webcontainer will handle timeouts for you, keep track of each user and his session, and so on.
But I would recommend that you use a standard for managing authntication
I have different mappings that start with \mobile or contain \mobile. Is there a way to catch all these mappings?
My Mappings are:
\mobile\login.mvc
\mobile\profile\details.mvc
\secure\mobile\profile\edit.mvc
Now I want that for all "\mobile" mappings one function oder mapping is called, and then the call mapping.
Background: I want to check with every call, whether the user is logged in and sign him if necessary. But I would not query at every mapping the parameters username and password but all in one place.
If you want to authenticate user in every controller then Spring AOP will be a good choice.
You can write a single authentication method and invoke it before controller using AOP.
This might help http://tedone.typepad.com/blog/2011/05/using-aop-easily-with-aspectj-and-spring.html
I'm using spring MVC, and I have a custom authentication/security system that I had to build.
NOTE: I know of spring security, but my requirements were to do this in a custom way so please not looking for suggestions about using spring's security modules.
When the user logs into the system, it creates a session cookie. When the user visits a page, a interceptor looks for the existance of that cookie, and looks up the session guid in mysql and if it is present that it loads some data and stores it in the request's attributes.
Now for pages where the user has to be logged in, how can I restrict access at the controller level?
I could do this in an interceptor:
if url.contains("projects/") ...
If I want to restrict access to only logged in users in the ProjectController, but this isn't really something I want to do.
But I am looking for maybe a annotation I could add at the controller level, or maybe somehow create a BaseController that all controllers that require a loggedin user will inherit from.
What are my options for something like this?
In ASP.NET, I created a baseController, and the controller has an event cycle, and in the before-action fired event I checked to see if the user was logged in.
So looking for suggestions for spring mvc?
Update
For example, in ASP.NET you have 2 methods, 1 that fires just before the controller's action method and one that fires after:
Controller.OnActionExecuting
Controller.OnActionExecuted
http://msdn.microsoft.com/en-us/library/system.web.mvc.controller.onactionexecuting.aspx
So in the OnActionExecuting, I can actually see exactly which controller I am in, and which action is about to get called in a programatic way, not by looking at the request URL and then doing string compares to see if it is a particular controller etc.
So in this event, I can simply check for things in cookies or in my request attributes etc.
This is a much more stable way to do it, does spring have anything similiar?
If you need this at the controller level, you could:
1) declare a java.security.Principal parameter in the controller method signature, which Spring will fill in with a Principal object, or
2) implement a PermissionEvaluator, which can be called on a controller method using the #PreAuthorize annotation, and which would have access to a Authentication object.
Similar to what you did in ASP.NET, you can take advantage of OncePerRequestFilter and chain it to the chain of filters you have in web.xml or Spring application context. The good point about this filter is that it's independent of the MVC approach that you take and no need for a "base controller".
On the other hand, if you're also using Spring security module, you can use a custom filter configuration and place it in the correct place that it should be.
If the check fails, then you'd probably want to raise exceptions or redirect user to the correct navigation.
Based on the last comment, you can also use mapped interceptors:
<mvc:interceptors>
<mvc:interceptor>
<mapping path="/myFirstPath/*"/>
<mapping path="/mySecondPath/*"/>
<bean class="org.example.SomeInteceptor" />
</mvc:interceptor>
<mvc:interceptor>another one</mvc:interceptor>
</mvc:interceptors>
I want to secure (temporarily) my application by create front page with captcha and simple form. I suppose Spring Security is too complicated for this task. How can I catch all requests and check if some attribute in session is set? If it is set then all these #RequestMapping methods should be executed, otherwise redirect to one front page.
Have a handler interceptor defined and applied to all the handlers. The example in that link shows you also how to perform the redirect. Also check the mvc:interceptors for the Spring 3 - like configuration.
You can simply configure a Filter for this
I'm using Spring for my web app. I have used several SimpleFormControllers. I've created a session in the first SimpleFormController for the login page using:
HttpSession session = request.getSession(true);
How can I protect other SimpleFormControllers using Sessions, i.e. so that other controllers won't load if the user is not loged in.
Thank you
You probably want to use Spring Security.
It's flexible and allows restrictions based on roles.
Without it, you will need to manually check in every controller whether the user logged in or not. Or you'll have to "reinvent" a security framework by adding filter to the webapp.
If you only want to protect the operation of getting the session, you need to write a filter that wraps the original request and overrides the getSession methods. There you can check for login data using the original request's getSession().
BTW, getSession() is equivalent to getSession(true)
To protect the Controller from access outside of the intended Session, you may want to compare the Scoping rules you need with this clearly written Guide.
How to get Session Object In Spring MVC
The author gives an example of creating a Controller annotated with #Scope("session")