JasonLeeForOnly's WebDAV sync failed with only "not a magpie backup" for
several versions, and nothing on the page got past it. A WebDAV GET of the
backup can come back as a body that isn't the file in several ways; each is
now reproduced with an httptest server that answers the way the real one
does:
Unpacked (WebDAV and S3): gzip with or without Content-Encoding (a proxy
that drops the header), x-gzip, zstd with or without the header, deflate
(zlib or raw), and a header that says gzip over a plain body. Bodies are
told by magic number; a backup is JSON, so either magic is never the file.
Brotli (br) can't be unpacked and is said as itself, with what to turn off.
Said, with no upload offered: an HTML page answered with 200 (Nextcloud
login after a redirect, Cloudflare Access, an AList/OpenList web app, an
rclone directory listing, a captive portal), with its <title> and the
host/path a redirect ended at (query, fragment and user dropped), and
where the WebDAV address is for 坚果云 and Nextcloud; an XML answer, by its
root element.
Said, with Upload as the way out: an empty (0-byte) file, a backup cut
short or damaged (the automatic rebuild is unchanged and still goes first
when its rules allow), another app's file ("format": "…"), other JSON,
and any other file by its content type. Messages carry the size, kind and a
page title only, never the file's contents.
backup.Open now tells ErrNotBackup (doesn't begin like a backup) from
ErrCorrupt (begins like one, cut short). The status carries the kind as
serverFile; Settings › Sync and backup says it in the reader's language,
wraps it whole, and shows "Upload this computer's setup" only when the file
may be replaced. davsync.Upload (POST /api/davsync/upload, `magpie webdav
upload`, `magpie s3 upload`) asks first in the GUI, re-reads the file,
refuses a backup this computer opens, one sealed with another passphrase,
a newer magpie's, a page and an XML answer, keeps the server's copy in the
sync folder (0600, newest 5) and writes nothing if that fails, then writes
with If-Match on the version read. New strings in en, zh, zh-TW, ja, de.
Verified: internal/davsync/not_backup_test.go (TestReadCompressedBackup,
TestReadBrotliSaid, TestServerAnswerSaid, TestCutBackupSaidAndUploaded,
TestS3ReadCompressedObject; Upload-only parts stripped to compile) fails
on e4a90aa6 for every compressed case but "gzip said", Brotli, every
server-answer case, the cut case and S3 gzip, and passes here. Dropping
the Replace check in Upload turns the page/XML cases red ("Upload wrote
over a page"). gofmt -l clean; go vet darwin, GOOS=linux and GOOS=windows
-tags nogui on ., davsync, backup, gui; full go test -tags nogui ./... ok;
-race on davsync and backup ok. GUI: sync-not-backup.test.cjs (en, zh,
zh-TW, ja, de; 900 and 440px), sync-*, s3-sync, gui-de, gui-ja, gui-zh-tw,
click-scroll in Chromium and WebKit, 81 pass. Not tried against a real
WebDAV server or on the Windows box; the reporter's server is unknown.
yetone
2018882e47