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Fix sanitizer config - multiple rules (#11133)

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In #9888, it was reported that my earlier pull request #9075 didn't quite function as expected. I was quite hopeful the `ValuesWithShadow()` worked as expected (and, I thought my testing showed it did) but I guess not. @zeripath proposed an alternative syntax which I like:

```ini
[markup.sanitizer.1]
ELEMENT=a
ALLOW_ATTR=target
REGEXP=something
[markup.sanitizer.2]
ELEMENT=a
ALLOW_ATTR=target
REGEXP=something
```

This was quite easy to adopt into the existing code. I've done so in a semi-backwards-compatible manner:

 - The value from `.Value()` is used for each element.
 - We parse `[markup.sanitizer]` and all `[markup.sanitizer.*]` sections and add them as rules.

This means that existing configs will load one rule (not all rules). It also means people can use string identifiers (`[markup.sanitiser.KaTeX]`) if they prefer, instead of numbered ones.

Co-authored-by: Andrew Thornton <art27@cantab.net>
Co-authored-by: guillep2k <18600385+guillep2k@users.noreply.github.com>
This commit is contained in:
Alexander Scheel
2020-04-29 07:34:59 -04:00
committed by GitHub
parent 6b6f20b6d4
commit 1bf9e44bda
4 changed files with 39 additions and 40 deletions
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6
custom/conf/app.ini.sample
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@@ -976,8 +976,10 @@ SHOW_FOOTER_VERSION = true
; Show template execution time in the footer
SHOW_FOOTER_TEMPLATE_LOAD_TIME = true
[markup.sanitizer]
; The following keys can be used multiple times to define sanitation policy rules.
[markup.sanitizer.1]
; The following keys can appear once to define a sanitation policy rule.
; This section can appear multiple times by adding a unique alphanumeric suffix to define multiple rules.
; e.g., [markup.sanitizer.1] -> [markup.sanitizer.2] -> [markup.sanitizer.TeX]
;ELEMENT = span
;ALLOW_ATTR = class
;REGEXP = ^(info|warning|error)$