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I am working on a "system requirements" project - where I need to know my visitors system hardware. It must work online. I know I can get the visitors GPU info but can't get CPU, RAM, HDD, etc.
Is it possible to obtain a visitor's hardware information?
In short, no.
PHP runs on the server and only has access to it and data sent to it.
Javascript runs on the client but is sandboxed and has no direct access to the hardware layer (just limited information about the GPU).
All services that do offer this kind of "scanning" (nVidia, etc) - use a downloadable application that scans the hardware for that platform then returns the result to the web service.
So you can do it, but you would need some additional software that can run on the client machine that can access the data you require.
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I am building a PWA and I have got restrictions that cached data have to be secure in some way, so I was wondering where the Cache API stores the data.
Since this feature is only available in Secure Contexts (HTTPS), we are protected against man in the middle attacks.
My main concern is that the cache could be accessible by other domains or through the users filesystem, where i suppose the data is stored. Sadly there is no documentation about this.
To provide more insight into my application:
PWA running on a nginx
.NET Backend running on the same domain and is accessible by appending "/api"
I am aware that I can navigate to the Cache Storage in the Chrome Dev Tools for example, but I do not know where they are stored, and whether they are encrypted or not.
Thanks in advance
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I want to buy a DVB-T stick which gets connect to PC and laptop by USB and has a software to play live TV on windows. What I want to do with that is to show the live TV stream from that stick on a web browser instead of the original windows software. The reason behind that is I need to use it in a digital signage program which only supports web platform for these kind of medias.
As far as I know, if I could make a html page which contains the player to show the live stream from the USB stick, the job is done, but my question is how to write that html page exactly. Any suggestion?
Thanks for paying attention to my question and helping me in advance.
This is not possible with HTML. Also PHP and JavaScript will not fit this problem. Because that are web based languages. You can not access plugin devices in any way.
The only way you can do is to write an application in C#/C++/Java which will read the usb and open it in a webview to show.
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I need to create a page which can be shared across multiple users. Means while doing some stuff on my page, that should be broadcast to all the users who are joining me that time. At the same time they can also do some stuff. Something like web conferencing. I need to either use javascript or C#. Is there any API or javascript plugins or any other libraries that I can use? If there then please tell me. I don't need to share desktop just need to share only one part of a web page or only one section only like you can assume I have a particular division, there I have a canvas. On that canvas, I will type or draw something that should be broadcast to everyone.
SignalR is an open source technology built by two Microsoft employees and leverages C# and JavaScript (there is a jQuery plugin for the script side).
A good example to get you rolling would be ASP.NET MVC 3 Real Time Collaborative Apps with SignalR.
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I had idea to compute big data by client browser when they're visiting web sites with web worker.
as you know web worker run safe thread in back end of browser which doesn't affect on main web site, so web site can use client processors to compute somethings like cracking or ext.
I'm trying to implement it as free and open source service with web sites get code (something like google analytics or ...) so when user click on use my processor during my visit of this site web workers starts ,get data from server,compute and send result to server.
Now I have two questions about this:
first: What do you think about this idea? Is it can be useful?
sencod: How can I determine cpu usage in web worker?is it possible?(maybe some one has core i7 so more web worker on his browser can be run)
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If I were malicious (or malicious and thoughtless) I could add some PHP to websites I'm working (or back-end web applications I'm building) that can send some data I'm not authorised to have to my remote server. There are numerous ways to achieve that.
I was wondering: can Javascript do something similar?
For example, is it possible to be spied by using some html/css/javascript web template which will disclose informations from(about) my website - send any kind of information from my website/web app to remote server of malicious developer?
Thanks in advance.
Yes, of course you can send data to other servers using javascript. The difference to your PHP-snippet approach is only that it is executed client-side, at the user's view of the application. So, you can only leak data that the current user is knowing, and you can only compromise the application with the rights of the current user (and his credentials).
However, it would be more difficult to detect javascript injections (which can also happen clientside or during the transfer) than malicious PHP snippets.