Add a redirectable script that sets canRunAds true

[Yuki2718]

Related discussion: uBlockOrigin/uAssets@036e131
If this is added, we can add following very wide rules safely:

/prebid-ads.js$script,redirect=canrunads
/ads-prebid.js$script,redirect=canrunads

These should cover not only bigbtc.win but many more: https://publicwww.com/?q=%22%2Fprebid-ads.js%22+depth%3Aall See how many /prebid-ads.js or /ads-prebid.js rules are in Base filters.

[slavaleleka]

so this redirect should simply set constant?

canRunAds = true

[Yuki2718]

so this redirect should simply set constant?

Yes. Here's an actual bait path: https://bigbtc.win/js/ads-prebid.js. Not all /prebid-ads.js or /ads-prebid.js work in this way but many.

[slavaleleka]

there are a lot of prebid-ads scripts where different constant are used, so it might be overkill, don't you think?

just few of none-canrunads ones:

checkfresh.com/js/prebid-ads.js
playshakespeare.com/modules/mod_antiadblocker/assets/js/prebid-ads.js
techilife.com/wp-content/plugins/ad-blocker/assets/js/prebid-ads.js
leaklinks.com/js/prebid-ads.js
chipverify.com/modules/mod_ablockdetector/js/prebid-ads.js
note.sieuthuthuat.com/js/prebid-ads.js

[Yuki2718]

Whoa, that is what I certainly missed. It needs evaluation then.

From recent Base entries:
Works

playerdrive.me/assets/js/prebid-ads.js
swnovels.com/assets/js/prebid-ads.js
player.oyasumi.me/assets/js/prebid-ads.js
mangaalarab.com/app/js/ads-prebid.js

Doesn't work

zeroupload.com/js/js/prebid-ads.js
checkfresh.com/js/prebid-ads.js
www.playshakespeare.com/modules/mod_antiadblocker/assets/js/prebid-ads.js?2fb1b1cb4260432a28de51cf238b11c6
zerodmca.com/js/js/prebid-ads.js
sanctuary.moe/js/ads-prebid.js
lootup.me/assets/js/ads-prebid.js
universalfreecourse.com/ads-prebid.js
downloadfreecourse.com/ads-prebid.js

Looks worse than 50:50...

[Yuki2718]

A few more working cases:

hideandseek.world/js/prebid-ads.js
timebucks.com/publishers/js/prebid-ads.js
true-gaming.net/home/wp-content/themes/TrueGaming2021/js/prebid-ads.js
playmyopinion.com/assets/developer/js/prebid-ads.js

I think the resource is still overall worth, we just need to avoid $important so that non-working cases will not be affected if an exception is added. It won't negatively affect in those cases. Many of them create a random-id div or use an unique variable, but I found another commonly used variable of isAdBlockActive:

note.sieuthuthuat.com/js/prebid-ads.js
leaklinks.com/js/prebid-ads.js
getpaste.link/js/prebid-ads.js
sharetext.me/js/prebid-ads.js
vippaste.xyz/js/prebid-ads.js

Probably setting isAdBlockActive to false too will improve its usefulness.
cc @gorhill

[ameshkov]

Okay, there're two possible approaches:

1. One redirect stub that combines many constants in it (constant-detection-stubs)
2. Multiple stubs, one per constant (constant-canrunads, constant-isadblockactive)

Which one do you think is better?

CC @AdguardTeam/filters-maintainers

[Yuki2718]

I emphasize that the actual use will be generic filter. There's not much sense to use this only for specific domain as we can use and has been using scriptlet for that.

[AdamWr]

I would prefer one redirect (constant-detection-stubs) with two or few most popular/used constants, so it could cover more cases if it would be used as a generic rule.

[gorhill]

Personally I prefer one constant per stub, otherwise this causes a user to stand out as using a content blocker . i.e. a site could load a script which set canRunAds and then test if isAdblockActive is true to find out that the visitor is most certainly using a content blocker -- which then defeat the purpose of the stub.

[Yuki2718]

I actually considered about that but that's no worse than not using stub (no fix) - detected by blocking prebid-ads. Also such detection can be done even with one-constant stub (a website can use a constant inversely - check whether canRunAds is true to detect). We anyway can't hide the fact user is using content blocker as long as it blocks something.

[gorhill]

Ok I see, the same script file name is used as bait for either sentinel variables, and it wouldn't be possible to create a generic filter that set both variables with one single redirection.

[slavaleleka]

@gorhill I see you've already created a single redirect for few variables

[Yuki2718]

I made commits after the comment: gorhill/uBlock@ef25f30