%25foo is a legal article title, but %25bar is not
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	dchan
	Jun 14 2016, 9:57 PM

Description

Steps to reproduce:

Browse to https://cy.wikipedia.org/wiki/%25foo .
Then browse to https://cy.wikipedia.org/wiki/%25bar .

Expected behaviour: Both titles should be illegal. (Or both should be legal, but I guess that's messier).

Observed behaviour: %25foo , but %25bar is not.

It seems titles containing %25 are illegal if they match /%25[0-9A-Fa-f][0-9A-Fa-f]/ . I guess this prohibition may be because parts of mediawiki are rather fluid about transparently encoding/decoding URI components, in which case this might not be easy to fix.

Event Timeline

dchan created this task.Jun 14 2016, 9:57 PM

Restricted Application added subscribers: Zppix, Aklapper. · View Herald TranscriptJun 14 2016, 9:57 PM

Aklapper triaged this task as Low priority.Jun 15 2016, 12:41 PM

Works as designed (see MediaWikiTitleCodec::getTitleInvalidRegex)

			# Matching titles will be held as illegal.
			$rxTc = '/' .
				# Any character not allowed is forbidden...
				'[^' . Title::legalChars() . ']' .
				# URL percent encoding sequences interfere with the ability
				# to round-trip titles -- you can't link to them consistently.
				'|%[0-9A-Fa-f]{2}' .
				# XML/HTML character references produce similar issues.
				'|&[A-Za-z0-9\x80-\xff]+;' .
				'|&#[0-9]+;' .
				'|&#x[0-9A-Fa-f]+;' .
				'/S';

Why change this?

In T137847#2391624, @Umherirrender wrote:

Why change this?

No reply, hence closing as declined.

%25foo is a legal article title, but %25bar is notClosed, DeclinedPublicActions

Description

Event Timeline

%25foo is a legal article title, but %25bar is not
Closed, DeclinedPublic
Actions