* Security: refuse email links that attach or insert a local file
Follow-up to #104. A document's mailto: link could ask the email app to
attach a file from the user's computer (Evolution, KMail and Claws Mail
honour attach=, Evolution and KMail also attachment=) or read one into
the body (Claws Mail's insert=).
document_url now refuses a mailto: address in which any word starting
with attach or insert (any case) is followed by =, wherever it stands
and after each layer of percent-decoding. It also refuses text that
some email tools decode before reading the address: RFC 2047 encoded
words, which KMail decodes across the whole address, and backslash
escapes, which xdg-email's echo decodes. The link is refused rather
than rewritten: PdfCraft doesn't change what a document asks to open,
and the email apps' parsers disagree with one another.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
* Security: show a link's host as the browser receives it, in punycode
Follow-up to #104. The link prompt's host now comes from
links::display_host, which reads it with url::Url: the webbrowser crate
hands the OS that crate's serialisation, and the web build's browser
parses by the same WHATWG standard. International hosts are shown in
punycode with a note, a label mixing writing systems (UTS #39 resolved
script sets) gets a red warning, numeric hosts such as 3232235777 show
as 192.168.1.1, and a host the browser would reject is refused as
malformed. The Unicode form isn't repeated in the prompt, so a
whole-script lookalike can't read as the real site.
url, idna and icu_properties become direct dependencies of
pdfcraft-engine; all three were already in the graph.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
* Security: refuse document addresses the URL parser rejects
Follow-up to #104. egui opens links through the webbrowser crate, which
parses the address with url::Url and, when that fails, treats it as a
local file path and opens file:///<cwd>/<address> in the browser.
document_url accepted addresses that don't parse, such as
mailto://a^b/x or https://a^b/ (a forbidden host code point), so a
document could still get the browser to open a local path.
document_url now also requires url::Url to accept the address with the
same scheme, which is exactly the parse webbrowser does first.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
---------
Co-authored-by: Claude Opus 5.5 <noreply@anthropic.com>
Co-authored-by: Brandon Thomas <echelon@gmail.com>
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