B4J Question serve specific site to each user

ilan · Jul 5, 2021

hi

lately, i am working on several b4j web apps (and also other platforms). my question is more a technical question than related to b4j.
i made a media center web app where users can enter the site and watch a movie. i did it for my own needs (for my kids at home) so it is something like Netflix. you can filter categories for each user according to his age and so on.

so i came into the following issue (that i have already solved but not sure in the correct way).

i will explain.

so first there is the login page. after login, you are directed to the main page where you can browse between the movies. after you choose a movie you are directed to a site that is auto-generated that holds the movie description and the movie itself. let's call it movie.html
my problem was that all movies were redirected to this page and let say if i was watching the movie and another user would open in another browser a different movie and I would press F5 (refresh my page) then i would now watch the movie the other user was watching.

i solved it by generating for each user a new website -> save it on the server and redirect to it. now everyone has a unique site where he can watch his movie.

my question is what would be the right way to solve such an issue?

thanx, ilan

EnriqueGonzalez · Jul 5, 2021

B4j can serve static pages .html and dynamic pages,

The best approach for your issue is to build the page everytime someone access the the url/endpoint

Instead of serving the html file directly, build it as a string and pass it to the method resp.write that receives a string, that string is shown in the browser

To do so just add the /endpoint to the handlers of the servers

ilan · Jul 5, 2021

Enrique Gonzalez R said:
B4j can serve static pages .html and dynamic pages,

The best approach for your issue is to build the page everytime someone access the the url/endpoint

Instead of serving the html file directly, build it as a string and pass it to the method resp. write that receives a string, that string is shown in the browser

To do so just add the /endpoint to the handlers of the servers

so you are saying it would be better to respond to the request with an HTML string instead of redirecting to the newly created HTML page?
but why is that better? it seems like to be the same approach, isn't it?

i am using the same technique as EJS where you have a template and fill the parts that are changing. this is what i do now and serve the site.

EnriqueGonzalez · Jul 5, 2021

ilan said:
but why is that better?

Each user of your app will have a personalized version of the site

ilan said:
technique as EJS

I don't know what is JES

ilan said:
this is what i do now and serve the site.

Do the same but serve it as a string and not from a file.

TILogistic · Jul 5, 2021

You do not need to create pages for each user.

it only controls the user's session through a cookie

HTTP cookie - Wikipedia

en.wikipedia.org

EnriqueGonzalez · Jul 5, 2021

oparra said:
it only controls the user's session through a cookie

This is partially correct. Its better to use variable sessions than cookies because the formers are not send to the client

TILogistic · Jul 5, 2021

Enrique Gonzalez R said:
This is partially correct. Its better to use variable sessions than cookies because the formers are not send to the client

or token the session

ilan · Jul 5, 2021

Is there a simple example for b4j to creating cookies and read them?

EnriqueGonzalez · Jul 5, 2021

How to add cookies in a ws thread?

Hi, In B4J server filter and handler threads, I can add cookie Dim addcookie As Cookie addcookie.Initialize("key","value") resp.addcookie(addcookie) In websocket thread, I am using jquery.cookie plugin on the client side to add cookie. Is it possible to make it on the server...

www.b4x.com

This is how you write a cookie. Read a cookie is similiar just look in req

I advice you that your problem will not be solved with cookies. Or better said cookies is an overengineering in this case

Xandoca · Jul 5, 2021

ilan said:
Is there a simple example for b4j to creating cookies and read them?

If you are using Websocket take a look here
Specially GetAttribute2 and SetAttribute:

B4X:

Private Sub WebSocket_Connected (WebSocket1 As WebSocket)
    ws = WebSocket1
    name = ws.Session.GetAttribute2("name", "")
    If name = "" Then
        'name not found. Go to the login page. This will happen if the user goes to the chat page directly.
        WebUtils.RedirectTo(ws, "index.html")
    Else
        'remove the attribute
        'the user will be redirected to the login page next time.
        ws.Session.SetAttribute("name", "")
        CallSubDelayed3(ChatShared, "NewConnection", Me, name)
        txt.RunMethod("select", Null)
    End If
End Sub

ilan · Jul 5, 2021

Xandoca said:

If you are using Websocket take a look here
Specially GetAttribute2 and SetAttribute:

B4X:

Private Sub WebSocket_Connected (WebSocket1 As WebSocket)
    ws = WebSocket1
    name = ws.Session.GetAttribute2("name", "")
    If name = "" Then
        'name not found. Go to the login page. This will happen if the user goes to the chat page directly.
        WebUtils.RedirectTo(ws, "index.html")
    Else
        'remove the attribute
        'the user will be redirected to the login page next time.
        ws.Session.SetAttribute("name", "")
        CallSubDelayed3(ChatShared, "NewConnection", Me, name)
        txt.RunMethod("select", Null)
    End If
End Sub

but this is stored only as long the session is active. with cookies, i can store data and even if the user will get back in few days he will see those data. and everything is hashed.
like if he adds products to the chart i can store those in a cookie and later when he return to my page the chart will hold those products.

so how to create/read cookies when using WebSocket?

TILogistic · Jul 5, 2021

see:

[Server] Login System & Filters Tutorial

Try it online: https://www.b4x.com:51042/login_example/ Note that it is not connected to the forum database. Feel free to test it and register new users. Its only purpose is to demonstrate this solution. Login Example A typical web solution consists of several folders. In this case the...

www.b4x.com

http://www.b4x.com:51042/login_example/signin.html

Xandoca · Jul 5, 2021

ilan said:
but this is stored only as long the session is active. with cookies, i can store data and even if the user will get back in few days he will see those data. and everything is hashed.
like if he adds products to the chart i can store those in a cookie and later when he return to my page the chart will hold those products.

so how to create/read cookies when using WebSocket?

I think you're right about the session cookies.
I will make some tests and let you know.
Regards

Xandoca · Jul 5, 2021

Xandoca said:
I think you're right about the session cookies.
I will make some tests and let you know.
Regards

Ilan,

Attached an example on how to do it with Websocket and without Websocket.
1) With WebSockets
Add a filter at main class. In filter class, add the cookies you want for specific pages or for all pages. (Class Module SetCookies)
Maybe there are other ways to do it.

2) Without WebSockes
Same as With WebSockets ...
Or
You can the the following code inside the class module:

B4X:

Sub Handle(req As ServletRequest, resp As ServletResponse)
'...
    Dim c As Cookie
    c.Initialize("cookiename","cookvalue")
    c.MaxAge = 3600
    resp.AddCookie(c)
'...
End Sub

I made a test and works fine.

Regards

ilan · Jul 5, 2021

Xandoca said:
Ilan,

Attached an example on how to do it with Websocket and without Websocket.
1) With WebSockets
Add a filter at main class. In filter class, add the cookies you want for specific pages or for all pages. (Class Module SetCookies)
Maybe there are other ways to do it.

2) Without WebSockes
Same as With WebSockets ...
Or
You can the the following code inside the class module:

B4X:

Sub Handle(req As ServletRequest, resp As ServletResponse) '... Dim c As Cookie c.Initialize("cookiename","cookvalue") c.MaxAge = 3600 resp.AddCookie(c) '... End Sub

I made a test and works fine.

Regards

thank you very much @Xandoca for taking the time and making this example. i will have a look at it. although I will not use cookies to solve the issue posted in post #1 but working with cookies is very important for every web developer so I will need them for a different purpose (then eating them ?)

Xandoca · Jul 5, 2021

ilan said:
thank you very much @Xandoca for taking the time and making this example. i will have a look at it. although I will not use cookies to solve the issue posted in post #1 but working with cookies is very important for every web developer so I will need them for a different purpose (then eating them ?)

It's my pleasure. This is nothing compared to the time and work you spent at Game Tutorial (I've enjoyed so much).
Regards.

ilan · Jul 5, 2021

Xandoca said:
It's my pleasure. This is nothing compared to the time and work you spent at Game Tutorial (I've enjoyed so much).
Regards.

btw i am just getting ready to record part 5 (collision detection) i hope i can do it in 1 run and not 10 recording attempts

TILogistic · Jul 5, 2021

ilan said:
thank you very much @Xandoca for taking the time and making this example. i will have a look at it. although I will not use cookies to solve the issue posted in post #1 but working with cookies is very important for every web developer so I will need them for a different purpose (then eating them ?)

????????????

very very good

tchart · Jul 6, 2021

Enrique Gonzalez R said:
This is partially correct. Its better to use variable sessions than cookies because the formers are not send to the client

^ This

It is better to store the data in the session as the user cannot forge them.

One of my web apps is multi-tenant app - meaning it supports many organisations under the same app. Their data is segregated.

During the authentication I store their details;

B4X:

req.GetSession.SetAttribute("registered", True)
req.GetSession.SetAttribute("fullName", fullName)
req.GetSession.SetAttribute("orgId", orgId)
req.GetSession.SetAttribute("username", username)

Then later when they make another request I can retrieve these attributes and apply to SQL queries etc

B4X:

Dim fullName As String = req.GetSession.GetAttribute2("fullName", "")
Dim orgId As String = req.GetSession.GetAttribute2("orgId", "")

B4J Question serve specific site to each user

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