* Move to goldmark
Markdown rendering moved from blackfriday to the goldmark.
Multiple subtle changes required to the goldmark extensions to keep
current rendering and defaults.
Can go further with goldmark linkify and have this work within markdown
rendering making the link processor unnecessary.
Need to think about how to go about allowing extensions - at present it
seems that these would be hard to do without recompilation.
* linter fixes
Co-authored-by: Lauris BH <lauris@nix.lv>
* Support custom sanitization policy
Allowing the gitea administrator to configure sanitization policy allows
them to couple external renders and custom templates to support more
markup. In particular, the `pandoc` renderer allows generating KaTeX
annotations, wrapping them in `<span>` elements with class `math` and
either `inline` or `display` (depending on whether or not inline or
block mode was requested).
This iteration gives the administrator whitelisting powers; carefully
crafted regexes will thus let through only the desired attributes
necessary to support their custom markup.
Resolves: #9054
Signed-off-by: Alexander Scheel <alexander.m.scheel@gmail.com>
* Document new sanitization configuration
- Adds basic documentation to app.ini.sample,
- Adds an example to the Configuration Cheat Sheet, and
- Adds extended information to External Renderers section.
Signed-off-by: Alexander Scheel <alexander.m.scheel@gmail.com>
* Drop extraneous length check in newMarkupSanitizer(...)
Signed-off-by: Alexander Scheel <alexander.m.scheel@gmail.com>
* Fix plural ELEMENT and ALLOW_ATTR in docs
These were left over from their initial names. Make them singular to
conform with the current expectations.
Signed-off-by: Alexander Scheel <alexander.m.scheel@gmail.com>
* restructure markup & markdown to prepare for multiple markup languages support
* adjust some functions between markdown and markup
* fix tests
* improve the comments
