Uassets: TFC.TV Anti adblock

[Markastil]

Replace the bracketed [...] placeholders with your own information.

URL(s) where the issue occurs

TFC.TV

Describe the issue

Videos will not play with ublock enabled.

Screenshot(s)

https://imgur.com/a/71yqFoD

Versions

• Browser/version: Version 66.0.3359.139 (Official Build) (64-bit)

• uBlock Origin version: 1.16.2

  Settings

• [Default]

Notes

I want to learn how to create an anti adblock for specific websites that prevent videos from playing. Can anyone show me the ropes?

Is there a filter that I can add to prevent this from happening?

Thank you.

[geoffdutton]

Try adding tfc.tv##script:inject(fuckadblock.js-3.2.0)

The blockadblock script is normally an internal redirect, but I'm seeing this:
Access to Script at 'data:application/javascript;base64,KGZ1bmN0aW9....pOyB9Cn0pKCk7' from origin 'null' has been blocked by CORS policy: Invalid response. Origin 'null' is therefore not allowed access.

So the fuckadblock-3.2.0 wasn't being evaluated.

Edit: It's because the script has the crossorigin attribute
<script type="text/javascript" crossorigin="anonymous" src="//gtcdn.azureedge.net/assets/js/blockadblock.js"></script>

[mapx-]

@Markastil probably to fully test your issue I need an account ?!

Could you test
tfc.tv##script:inject(abort-on-property-write.js, adBlockDetected)

[Markastil]

Sadly, both those filters do not work.

Here is more information about the problem. I included a log before the play button is loaded. Also, what type of language is ublock using? I'd like to learn more about it. It's really starting to interest me. I want to practice and start making anti adblockers.

https://imgur.com/a/eiUfxFU

[mapx-]

What filter lists are enabled in uBo ?

[Markastil]

I've tried both default, and all.

[okiehsch]

@Markastil are you logged in while testing the filters?

[okiehsch]

By the way I can see from your screenshot https://imgur.com/a/eiUfxFU that you added
tfc.tv##script:inject(abort-on-property-write.js, adBlockDetecte) not
tfc.tv##script:inject(abort-on-property-write.js, adBlockDetected)

[mapx-]

other working filter ?
tfc.tv##script:inject(set-constant.js, blockAdBlock, true)

[Markastil]

@okiehsch Yes I am. Also, fixed that too.
` @mapxtfc.tv##script:inject(set-constant.js, blockAdBlock, true)` also does not work.

[mapx-]

test these "classic" filters

@@||tfc.tv^$generichide
@@||gtcdn.azureedge.net/assets/js/blockadblock.js$script,domain=tfc.tv

[Markastil]

@mapx- also doesn't work.

Here is a log of
@@||tfc.tv^$generichide
@@||gtcdn.azureedge.net/assets/js/blockadblock.js$script,domain=tfc.tv

https://i.imgur.com/OupayUZ.png

[mapx-]

probably we need a full account

[Markastil]

@mapx- Darn. Thanks for the help though. I wish I knew more about this. Seems really fun to figure out.

[geoffdutton]

@Markastil If you don't add any custom filters and open the Chrome Dev Console, do you see the following error?

Access to Script at 'data:application/javascript;base64,KGZ1bmN0aW9....pOyB9Cn0pKCk7' from origin 'null' has been blocked by CORS policy: Invalid response. Origin 'null' is therefore not allowed access.

From the logs in your screen shot (https://imgur.com/a/eiUfxFU), it shows gtcdn.azureedge.net/assets/js/blockadblock.js is being internally redirected to fuckadblock-3.2.0, and that works in most cases except when the script tag contains the attribute crossorigin="anonymous".

[jspenguin2017]

It works fine for me:
http://tfc.tv/episode/details/155055/the-world-tonight-april-28-2018

Note that you need Flash, which could be the problem.

[geoffdutton]

@jspenguin2017 With what filter(s)?

[jspenguin2017]

Default of Nano plus a regional filters.

@mapx- set-constant.js will bail out if the variable is assigned to data of different type.

[mapx-]

tfc.tv##script:inject(abort-on-property-write.js, adBlockDetected)
working for me as well

[Markastil]

Tried
tfc.tv##script:inject(abort-on-property-write.js, adBlockDetected)
without logging in, it works. However if you do have an account it doesn't work.

[mapx-]

If you'll send me your account ( if you confirm I'll post here an email address) I can test again the issue

[Markastil]

@geoffdutton Here is what the console says https://i.imgur.com/YDCHLns.png
@mapx- I'll think about it, not comfortable with that option unless I give up on the problem.

[mapx-]

I used a basic account and I was able to start a show using this filter too:
@@||tfc.tv/Scripts/amp-ads.js

[Markastil]

@mapx got a discord? maybe I can share my screen and you can see what's happening.

[mapx-]

Did you test my last filter too ?

these 2:

tfc.tv##script:inject(abort-on-property-write.js, adBlockDetected)
@@||tfc.tv/Scripts/amp-ads.js

tested show (using a basic free account):
http://tfc.tv/episode/details/155090/the-bottomline-with-boy-abunda-april-28-2018

[Markastil]

@mapx- Yes. Here are the logs and consoles. https://imgur.com/a/98Xzxly

Video if you're curious. https://streamable.com/knv02

[mapx-]

use this filter replacing the second 1
@@||tfc.tv/Scripts/*ads.js

[geoffdutton]

@Markastil You need to also use @@||tfc.tv/Scripts/amp-full-ads.js.

I'd guess they use tfc.tv/Scripts/amp-full-ads.js when you have a premium account, and that's the code that needs to evaluate in order for the play button to actually start the video.

So try something like

tfc.tv##script:inject(abort-on-property-write.js, adBlockDetected)
@@||tfc.tv/Scripts/amp-*.js

[Markastil]

@mapx- For a second I thought it was almost working! However it ends up buffering indefinitely.

https://streamable.com/0yenh

[Markastil]

@geoffdutton just like @mapx- 's the player now tries to buffer the ad indefinitely. https://imgur.com/a/k1wPkq1

[mapx-]

nothing to do, you have a full (premium) account, cannot help you further

You could try whitelisting the object entry in your logger .. but probably you'll get video ads

[Markastil]

The filter does work!
tfc.tv##script:inject(abort-on-property-write.js, adBlockDetected)
@@||tfc.tv/Scripts/amp-*.js
I had to to fully reset ublock and tried the filter again, it works! Thank you very much for the help.

[Markastil]

If you guys don't mind explaining, I want to learn more about this stuff.

1. Where do you find the available scripts? Like ((abort-on-property-write.js, adBlockDetected))

2. Why did this work
   @@||tfc.tv/Scripts/*ads.js

but not
@@||tfc.tv/Scripts/amp-ads.js

[mapx-]

all the scriptlets uBo can use:
https://github.com/uBlockOrigin/uAssets/blob/master/filters/resources.txt

examine the page (press ctrl-u) and you'll find adBlockDetected

the basic account uses tfc.tv/Scripts/amp-ads.js, the full one tfc.tv/Scripts/amp-full-ads.js