Mistune.util.escape_url is too aggressive #295
Merged
Conversation
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
This adds ';', '!', and '$' to the set of characters which will be passed unmolested by escape_url. These are all in RFC 3986 reserved character list — that is to say: escaping these may change the meaning of a URL.
bmwiedemann
pushed a commit
to bmwiedemann/openSUSE
that referenced
this pull request
Jan 8, 2022
https://build.opensuse.org/request/show/944542 by user mcepl + dimstar_suse - Add 295-overagreesive-escape_url.patch make mistune.util.escape_url less aggressive (gh#lepture/mistune#295).
|
As far as I can tell, the CI test failures are spurious. They are failing in the first "Set up job" step. |
|
Thanks. I'll make a new release. |
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment
Add this suggestion to a batch that can be applied as a single commit.
This suggestion is invalid because no changes were made to the code.
Suggestions cannot be applied while the pull request is closed.
Suggestions cannot be applied while viewing a subset of changes.
Only one suggestion per line can be applied in a batch.
Add this suggestion to a batch that can be applied as a single commit.
Applying suggestions on deleted lines is not supported.
You must change the existing code in this line in order to create a valid suggestion.
Outdated suggestions cannot be applied.
This suggestion has been applied or marked resolved.
Suggestions cannot be applied from pending reviews.
Suggestions cannot be applied on multi-line comments.
Suggestions cannot be applied while the pull request is queued to merge.
Suggestion cannot be applied right now. Please check back later.
This adds
';','!', and'$'to the set of characters which will be passed unmolested bymistune.util.escape_url. These are all in RFC 3986’s reserved character list — that is to say: escaping these may change the meaning of a URL.Bugs Fixed
I noticed this when a
data:URL was mangled by the escaping of a semicolon. The two URLs:data:text/plain;base64,d293anddata:text/plain%3Bbase64,d293are not equivalent (the first has content-typetext/plain, the second has content-typetext/plain;base64.)Further Discussion
There are three other characters in the RFC 3986 reserved character list which may be worth adding to the list of unescaped octets:
'[',']',"'".Escaping square brackets breaks URLs with numeric ipv6 addresses in the netloc (e.g.
http://[::1]/).However, I have not yet included these in this PR because doing so breaks the Backslash-escapes do not work inside autolinks test in
tests/fixtures/commonmark.txt, and I'm not quite sure how sacrosanct those tests are to you.As for single quotes, I can not come up with an example of a URL scheme that relies on them, but they are in the list of reserved characters, and it would probably be safer not to escape them.