Re: Privoxy-users Digest, Vol 25, Issue 2

What makes filters and blocks unreliable for blocking Javascript?

Can you add something to the documentation that actually explains how 
to construct filters? You've listed an example filter here and there 
are examples in the Privoxy documentation, but it's difficult to figure 
out the actual structure of filters from examples alone. When you say 
"use a filter like," that tells me nothing because I'm not sure what 
the individual parts of your example do, so I don't know which parts of 
it to use in my own filter. I can refresh my knowledge of regular 
expressions by myself, but it would be nice to know what to apply the 
regular expressions to.

On Wed, Nov 28, 2018 at 4:00 AM, 
[email protected] wrote:
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> Today's Topics:
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>    1. How to Block/Allow Javascript? (H. Hodges)
>    2. Re: How to Block/Allow Javascript? (Fabian Keil)
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> ----------------------------------------------------------------------
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> Message: 1
> Date: Mon, 12 Nov 2018 14:12:02 -0800
> From: "H. Hodges" <[email protected]>
> To: [email protected]
> Subject: [Privoxy-users] How to Block/Allow Javascript?
> Message-ID: <[email protected]>
> Content-Type: text/plain; charset=utf-8; format=flowed
> 
> I want to block Javascript by default and whitelist some scripts. I
> assume that I need to use filters, but I don't know how to refer to
> Javascript in the rules (for example, *.js or ^script).
> 
> Thanks for any help.
> 
> 
> ------------------------------
> 
> Message: 2
> Date: Tue, 27 Nov 2018 16:25:00 +0100
> From: Fabian Keil <[email protected]>
> To: "H. Hodges" <[email protected]>, [email protected]
> Subject: Re: [Privoxy-users] How to Block/Allow Javascript?
> Message-ID: <[email protected]>
> Content-Type: text/plain; charset="us-ascii"
> 
> "H. Hodges" <[email protected]> wrote:
> 
>>  I want to block Javascript by default and whitelist some scripts. I
>>  assume that I need to use filters, but I don't know how to refer to
>>  Javascript in the rules (for example, *.js or ^script).
> 
> You can use both a filter and blocks, however this will
> not work 100% reliable.
> 
> To remove script regions you can use a filter like:
> 
> FILTER: remove-scripts Remove script tags
> s@<script[^>]*>.*</script>@@Ugis
> 
> Additionally you can block URLs ending with js:
> 
> {+block{JavaScript is disabled}}
> /.*\.js
> 
> Some sites embed JavaScript in other tags using event attributes:
> https://en.wikipedia.org/wiki/HTML_attribute#Event_attributes
> 
> Preventing this requires additional filter rules.
> 
> Fabian
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