chooseSendFormat() routes markdown containing a raw http(s) URL through
spectrum-ts' text() builder, because the markdown builder's iMessage data
detection 500s on those messages (#73615). text() ships the payload
verbatim, and nothing strips the markers on the way down, so any reply
that mentions a link arrives in iMessage as literal markdown source:
**Release 1.2.0** is out
- **EUR 5** off this month
https://example.com/releases/1.2.0
Every ** is visible in the bubble. Remove the URL from that same reply
and it renders correctly, which is what makes the URL the trigger rather
than the content.
spectrum-ts documents markdown() as degrading to readable plain text on
platforms without native support "instead of surfacing raw ** markers".
Selecting text() ourselves opts out of that guarantee, so the adapter has
to honour it instead.
Strip in _sidecar_send() when the payload is markdown and the sidecar will
downgrade it. The format key is deliberately preserved: the sidecar owns
the builder choice (test_rich_links.py pins that contract), and an older
sidecar without chooseSendFormat must keep rendering natively.
_send_plain_fallback() selects the text builder explicitly via
markdown=False and had the same leak, so it strips too.
Reuses the shared strip_markdown() helper rather than adding a second
implementation, so the PHOTON_MARKDOWN=false path and this path produce
identical output and both inherit any future fix to that helper.
Diagnosis previously reported in #85733, which was closed unmerged.
Stripping must not take the URL with it, though. The shared helper
collapsed [label](url) to label alone, which on this path is worse than
raw markdown: iMessage auto-links bare URLs and nothing else, so the
reply arrives with a description and no way to reach the link.
Open the itinerary on Google Flights <- URL gone entirely
So strip_markdown() takes keep_link_targets, which rewrites
[label](https://url) as "label\nurl" (own line, because these URLs are
often long) and leaves non-http targets such as mailto: or relative
paths label-only, since iMessage won't linkify those either. The default
is unchanged, so the SMS, IRC, Feishu and QQ callers keep dropping the
target as before.
plugins/platforms/line/adapter.py already carries a private
strip_markdown_preserving_urls() for exactly this reason ("LINE
auto-links bare URLs only"). This moves the behaviour behind the shared
helper instead, so Photon's three plain-text paths -- the downgrade,
_send_plain_fallback(), and PHOTON_MARKDOWN=false -- all agree.
gateway/platforms/bluebubbles.py is the same iMessage surface with the
same loss; left alone here to keep this change to one platform.
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