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* fix: make memcache concurrency-safe and stamp the version at link time
memcache was a crash waiting for traffic. Readers touched tempFS without
holding mx, while a per-entry goroutine deleted from it under the lock: a
concurrent map read and map write, which the runtime treats as a fatal error
that recover cannot catch. The option ships in config.example.json and was the
one cache key SETUP.md never documented, so it read like a free win to enable.
Put every map and field access behind the mutex, and age the whole map from one
janitor instead of a goroutine per cached file, each of which looped forever
holding its entry alive. mx is now a plain Mutex: every operation here mutates
something, and the old code took an RLock to write. Document the option, and
cover it with tests that run the readers, writers and janitor concurrently.
Split the disk/origin fetch out of DownloadAndSendMedia while there, so the
error path returns instead of falling through to write an empty body after the
error page.
Release.Version was hardcoded to 1.3.2, so images tagged v1.3.6 reported 1.3.2
from --help and /api/instance, and --help linked to the wrong release. Take it
from a main.version string the release workflow links in from the git tag.
* fix: reject forged subdomains in the media proxy
DownloadAndSendMedia built its upstream URL by concatenation, pasting the
subdomain segment of the request path straight into the host position. That
segment reaches the handler already percent-decoded, so it can carry "@", "#",
"?" and "/" — the characters that end a host. A request for
/media/file/[email protected]:8080%2F/f/x.jpg
built a URL whose host parsed as 127.0.0.1:8080, with images-wixmp-x demoted to
userinfo, letting any caller aim the instance's fetcher at any address it could
reach, including services behind the firewall.
Validate the label against ^[a-zA-Z0-9-]+$ and refuse anything else with a 400.
Rejecting rather than escaping is what closes this: the label is the host, and
url.URL passes a host through verbatim, so building the URL structurally is not
sufficient on its own. DeviantArt's own media URLs use a hex-and-dash label, and
ParseMedia already splits on the first dot, so a legitimate label cannot contain
one.
Build the URL from url.URL fields as well, which escapes the path, and encode
the token argument, which reached the request unescaped.
Reported by CodeQL as go/request-forgery (CWE-918).
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An unwritable cache directory degraded silently: media still served, because
the download succeeds before the cache write is attempted, so the only symptom
was one "permission denied" line per request and a cache that never filled.
Every request re-fetched from the CDN.
Probe the directory at startup and exit with the uid and the chown that fixes
it. The container image runs as uid 10000, which is the usual cause with a
bind-mounted cache, so say so in the message and in both compose examples.
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Two independent faults made every image fail while pages still rendered.
config.example.json shipped download-proxy=http://127.0.0.1:8080. Only media
fetches go through that proxy — pages reach DeviantArt via devianter on the
default transport — so when nothing listens there, images 502 and the rest of
the page looks fine. In a scratch container 127.0.0.1 is the container itself,
so the default could never work under Docker. Unset it and document that it must
stay empty unless an operator really runs a proxy.
Host was a package global reassigned by every request, so a concurrent request
could overwrite it mid-render and emit URLs on another origin's host and port.
The instance's own default-src 'self' CSP then blocked those images. Thread the
request's host through skunkyart instead, and take it as an explicit argument in
URLBuilder, ParseMedia, ParseDescription, BuildUserPlate and
ConvertDeviantArtURLToSkunkyArt. Feeds keep their absolute URLs.
Also start RefreshInstances after ExecuteConfig rather than before it: the
goroutine read CFG while json.Unmarshal was writing it (a race the detector
flags), and its fetch escaped both the throttle and the configured User-Agent.
Verified: 300 concurrent requests with distinct Host headers now round-trip
their own host (was 1 leak per 300), go test -race is clean, and
cache+proxy both enabled serves 200 image/jpeg cold and from cache.
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Upstream references still pointed at git.macaw.me, which is unmaintained
and whose instances.json is a dead link. Repoint them at this repo:
- RefreshInstances now fetches instances.json from raw.githubusercontent
- source/version links in index.htm, about.htm, and CLI help use the
GitHub releases tag URL
- SETUP.md/SETUP-RU.md language switch links were Gitea-absolute paths
that 404 on GitHub; make them relative
- --add-instance message says 'main' branch, matching this repo
The fork attribution in README.md is left as-is: it credits upstream
rather than pointing at the source.
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система кеша
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