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Project description

โ‡†๐ŸŽ‰ copyparty

  • http file sharing hub (py2/py3) (on PyPI)
  • MIT-Licensed, 2019-05-26, ed @ irc.rizon.net

summary

turn your phone or raspi into a portable file server with resumable uploads/downloads using IE6 or any other browser

  • server runs on anything with py2.7 or py3.3+
  • browse/upload with IE4 / netscape4.0 on win3.11 (heh)
  • resumable uploads need firefox 34+ / chrome 41+ / safari 7+ for full speed
  • code standard: black

๐Ÿ“ท screenshots: browser // upload // thumbnails // md-viewer // search // fsearch // zip-DL // ie4

readme toc

quickstart

download copyparty-sfx.py and you're all set!

running the sfx without arguments (for example doubleclicking it on Windows) will give everyone full access to the current folder; see -h for help if you want accounts and volumes etc

some recommended options:

  • -e2dsa enables general file indexing, see search configuration
  • -e2ts enables audio metadata indexing (needs either FFprobe or mutagen), see optional dependencies
  • -v /mnt/music:/music:r:afoo -a foo:bar shares /mnt/music as /music, readable by anyone, with user foo as admin (read/write), password bar
    • the syntax is -v src:dst:perm:perm:... so local-path, url-path, and one or more permissions to set
    • replace :r:afoo with :rfoo to only make the folder readable by foo and nobody else
    • in addition to read and admin, write makes a folder write-only, so cannot list/access files in it
  • --ls '**,*,ln,p,r' to crash on startup if any of the volumes contain a symlink which point outside the volume, as that could give users unintended access

you may also want these, especially on servers:

on debian

recommended steps to enable audio metadata and thumbnails (from images and videos):

  • as root, run the following:
    apt install python3 python3-pip python3-dev ffmpeg

  • then, as the user which will be running copyparty (so hopefully not root), run this:
    python3 -m pip install --user -U Pillow pillow-avif-plugin

(skipped pyheif-pillow-opener because apparently debian is too old to build it)

notes

general:

  • paper-printing is affected by dark/light-mode! use lightmode for color, darkmode for grayscale
    • because no browsers currently implement the media-query to do this properly orz

browser-specific:

  • iPhone/iPad: use Firefox to download files
  • Android-Chrome: increase "parallel uploads" for higher speed (android bug)
  • Android-Firefox: takes a while to select files (their fix for โ˜๏ธ)
  • Desktop-Firefox: may use gigabytes of RAM if your files are massive seems to be OK now
  • Desktop-Firefox: may stop you from deleting folders you've uploaded until you visit about:memory and click Minimize memory usage

status

summary: all planned features work! now please enjoy the bloatening

  • backend stuff
    • โ˜‘ sanic multipart parser
    • โ˜‘ multiprocessing (actual multithreading)
    • โ˜‘ volumes (mountpoints)
    • โ˜‘ accounts
  • upload
    • โ˜‘ basic: plain multipart, ie6 support
    • โ˜‘ up2k: js, resumable, multithreaded
    • โ˜‘ stash: simple PUT filedropper
    • โ˜‘ symlink/discard existing files (content-matching)
  • download
    • โ˜‘ single files in browser
    • โ˜‘ folders as zip / tar files
    • โ˜‘ FUSE client (read-only)
  • browser
    • โ˜‘ tree-view
    • โ˜‘ audio player (with OS media controls)
    • โ˜‘ thumbnails
      • โ˜‘ ...of images using Pillow
      • โ˜‘ ...of videos using FFmpeg
      • โ˜‘ cache eviction (max-age; maybe max-size eventually)
    • โ˜‘ image gallery with webm player
    • โ˜‘ SPA (browse while uploading)
      • if you use the file-tree on the left only, not folders in the file list
  • server indexing
    • โ˜‘ locate files by contents
    • โ˜‘ search by name/path/date/size
    • โ˜‘ search by ID3-tags etc.
  • markdown
    • โ˜‘ viewer
    • โ˜‘ editor (sure why not)

testimonials

small collection of user feedback

good enough, surprisingly correct, certified good software, just works, why

bugs

  • Windows: python 3.7 and older cannot read tags with ffprobe, so use mutagen or upgrade
  • Windows: python 2.7 cannot index non-ascii filenames with -e2d
  • Windows: python 2.7 cannot handle filenames with mojibake
  • --th-ff-jpg may fix video thumbnails on some FFmpeg versions

general bugs

  • all volumes must exist / be available on startup; up2k (mtp especially) gets funky otherwise
  • cannot mount something at /d1/d2/d3 unless d2 exists inside d1
  • dupe files will not have metadata (audio tags etc) displayed in the file listing
    • because they don't get up entries in the db (probably best fix) and tx_browser does not lstat
  • probably more, pls let me know

not my bugs

  • Windows: folders cannot be accessed if the name ends with .

    • python or windows bug
  • Windows: msys2-python 3.8.6 occasionally throws RuntimeError: release unlocked lock when leaving a scoped mutex in up2k

    • this is an msys2 bug, the regular windows edition of python is fine

the browser

copyparty-browser-fs8

tabs

  • [๐Ÿ”Ž] search by size, date, path/name, mp3-tags ... see searching
  • [๐Ÿš€] and [๐ŸŽˆ] are the uploaders, see uploading
  • [๐Ÿ“‚] mkdir, create directories
  • [๐Ÿ“] new-md, create a new markdown document
  • [๐Ÿ“Ÿ] send-msg, either to server-log or into textfiles if --urlform save
  • [๐ŸŽบ] audio-player config options
  • [โš™๏ธ] general client config options

hotkeys

the browser has the following hotkeys (assumes qwerty, ignores actual layout)

  • B toggle breadcrumbs / directory tree
  • I/K prev/next folder
  • M parent folder (or unexpand current)
  • G toggle list / grid view
  • T toggle thumbnails / icons
  • when playing audio:
    • J/L prev/next song
    • U/O skip 10sec back/forward
    • 0..9 jump to 0%..90%
    • P play/pause (also starts playing the folder)
  • when viewing images / playing videos:
    • J/L, Left/Right prev/next file
    • Home/End first/last file
    • Esc close viewer
    • videos:
      • U/O skip 10sec back/forward
      • P/K/Space play/pause
      • F fullscreen
      • C continue playing next video
      • R loop
      • M mute
  • when tree-sidebar is open:
    • A/D adjust tree width
  • in the grid view:
    • S toggle multiselect
    • shift+A/D zoom
  • in the markdown editor:
    • ^s save
    • ^h header
    • ^k autoformat table
    • ^u jump to next unicode character
    • ^e toggle editor / preview
    • ^up, ^down jump paragraphs

tree-mode

by default there's a breadcrumbs path; you can replace this with a tree-browser sidebar thing by clicking the ๐ŸŒฒ or pressing the B hotkey

click [-] and [+] (or hotkeys A/D) to adjust the size, and the [a] toggles if the tree should widen dynamically as you go deeper or stay fixed-size

thumbnails

copyparty-thumbs-fs8

it does static images with Pillow and uses FFmpeg for video files, so you may want to --no-thumb or maybe just --no-vthumb depending on how dangerous your users are

images with the following names (see --th-covers) become the thumbnail of the folder they're in: folder.png, folder.jpg, cover.png, cover.jpg

in the grid/thumbnail view, if the audio player panel is open, songs will start playing when clicked

zip downloads

the zip link next to folders can produce various types of zip/tar files using these alternatives in the browser settings tab:

name url-suffix description
tar ?tar plain gnutar, works great with curl | tar -xv
zip ?zip=utf8 works everywhere, glitchy filenames on win7 and older
zip_dos ?zip traditional cp437 (no unicode) to fix glitchy filenames
zip_crc ?zip=crc cp437 with crc32 computed early for truly ancient software
  • hidden files (dotfiles) are excluded unless -ed
    • up2k.db and dir.txt is always excluded
  • zip_crc will take longer to download since the server has to read each file twice
    • this is only to support MS-DOS PKZIP v2.04g (october 1993) and older
      • how are you accessing copyparty actually

you can also zip a selection of files or folders by clicking them in the browser, that brings up a selection editor and zip button in the bottom right

copyparty-zipsel-fs8

uploading

two upload methods are available in the html client:

  • ๐ŸŽˆ bup, the basic uploader, supports almost every browser since netscape 4.0
  • ๐Ÿš€ up2k, the fancy one

up2k has several advantages:

  • you can drop folders into the browser (files are added recursively)
  • files are processed in chunks, and each chunk is checksummed
    • uploads autoresume if they are interrupted by network issues
    • uploads resume if you reboot your browser or pc, just upload the same files again
    • server detects any corruption; the client reuploads affected chunks
    • the client doesn't upload anything that already exists on the server
  • much higher speeds than ftp/scp/tarpipe on some internet connections (mainly american ones) thanks to parallel connections
  • the last-modified timestamp of the file is preserved

see up2k for details on how it works

copyparty-upload-fs8

protip: you can avoid scaring away users with docs/minimal-up2k.html which makes it look much simpler

the up2k UI is the epitome of polished inutitive experiences:

  • "parallel uploads" specifies how many chunks to upload at the same time
  • [๐Ÿƒ] analysis of other files should continue while one is uploading
  • [๐Ÿ’ญ] ask for confirmation before files are added to the list
  • [๐Ÿ’ค] sync uploading between other copyparty tabs so only one is active
  • [๐Ÿ”Ž] switch between upload and file-search mode

and then theres the tabs below it,

  • [ok] is uploads which completed successfully
  • [ng] is the uploads which failed / got rejected (already exists, ...)
  • [done] shows a combined list of [ok] and [ng], chronological order
  • [busy] files which are currently hashing, pending-upload, or uploading
    • plus up to 3 entries each from [done] and [que] for context
  • [que] is all the files that are still queued

file-search

copyparty-fsearch-fs8

in the [๐Ÿš€ up2k] tab, after toggling the [๐Ÿ”Ž] switch green, any files/folders you drop onto the dropzone will be hashed on the client-side. Each hash is sent to the server which checks if that file exists somewhere already

files go into [ok] if they exist (and you get a link to where it is), otherwise they land in [ng]

  • the main reason filesearch is combined with the uploader is cause the code was too spaghetti to separate it out somewhere else, this is no longer the case but now i've warmed up to the idea too much

adding the same file multiple times is blocked, so if you first search for a file and then decide to upload it, you have to click the [cleanup] button to discard [done] files (or just refresh the page)

note that since up2k has to read the file twice, [๐ŸŽˆ bup] can be up to 2x faster in extreme cases (if your internet connection is faster than the read-speed of your HDD)

up2k has saved a few uploads from becoming corrupted in-transfer already; caught an android phone on wifi redhanded in wireshark with a bitflip, however bup with https would probably have noticed as well (thanks to tls also functioning as an integrity check)

markdown viewer

copyparty-md-read-fs8

  • the document preview has a max-width which is the same as an A4 paper when printed

other tricks

  • you can link a particular timestamp in an audio file by adding it to the URL, such as &20 / &20s / &1m20 / &t=1:20 after the .../#af-c8960dab

  • if you are using media hotkeys to switch songs and are getting tired of seeing the OSD popup which Windows doesn't let you disable, consider https://ocv.me/dev/?media-osd-bgone.ps1

searching

copyparty-search-fs8

when started with -e2dsa copyparty will scan/index all your files. This avoids duplicates on upload, and also makes the volumes searchable through the web-ui:

  • make search queries by size/date/directory-path/filename, or...
  • drag/drop a local file to see if the same contents exist somewhere on the server, see file-search

path/name queries are space-separated, AND'ed together, and words are negated with a - prefix, so for example:

  • path: shibayan -bossa finds all files where one of the folders contain shibayan but filters out any results where bossa exists somewhere in the path
  • name: demetori styx gives you good stuff

add -e2ts to also scan/index tags from music files:

search configuration

searching relies on two databases, the up2k filetree (-e2d) and the metadata tags (-e2t). Configuration can be done through arguments, volume flags, or a mix of both.

through arguments:

  • -e2d enables file indexing on upload
  • -e2ds scans writable folders for new files on startup
  • -e2dsa scans all mounted volumes (including readonly ones)
  • -e2t enables metadata indexing on upload
  • -e2ts scans for tags in all files that don't have tags yet
  • -e2tsr deletes all existing tags, does a full reindex

the same arguments can be set as volume flags, in addition to d2d and d2t for disabling:

  • -v ~/music::r:ce2dsa:ce2tsr does a full reindex of everything on startup
  • -v ~/music::r:cd2d disables all indexing, even if any -e2* are on
  • -v ~/music::r:cd2t disables all -e2t* (tags), does not affect -e2d*

note:

  • e2tsr is probably always overkill, since e2ds/e2dsa would pick up any file modifications and e2ts would then reindex those, unless there is a new copyparty version with new parsers and the release note says otherwise
  • the rescan button in the admin panel has no effect unless the volume has -e2ds or higher

you can choose to only index filename/path/size/last-modified (and not the hash of the file contents) by setting --no-hash or the volume-flag cdhash, this has the following consequences:

  • initial indexing is way faster, especially when the volume is on a network disk
  • makes it impossible to file-search
  • if someone uploads the same file contents, the upload will not be detected as a dupe, so it will not get symlinked or rejected

if you set --no-hash, you can enable hashing for specific volumes using flag cehash

database location

copyparty creates a subfolder named .hist inside each volume where it stores the database, thumbnails, and some other stuff

this can instead be kept in a single place using the --hist argument, or the hist= volume flag, or a mix of both:

  • --hist ~/.cache/copyparty -v ~/music::r:chist=- sets ~/.cache/copyparty as the default place to put volume info, but ~/music gets the regular .hist subfolder (- restores default behavior)

note:

  • markdown edits are always stored in a local .hist subdirectory
  • on windows the volflag path is cyglike, so /c/temp means C:\temp but use regular paths for --hist
    • you can use cygpaths for volumes too, -v C:\Users::r and -v /c/users::r both work

metadata from audio files

-mte decides which tags to index and display in the browser (and also the display order), this can be changed per-volume:

  • -v ~/music::r:cmte=title,artist indexes and displays title followed by artist

if you add/remove a tag from mte you will need to run with -e2tsr once to rebuild the database, otherwise only new files will be affected

-mtm can be used to add or redefine a metadata mapping, say you have media files with foo and bar tags and you want them to display as qux in the browser (preferring foo if both are present), then do -mtm qux=foo,bar and now you can -mte artist,title,qux

tags that start with a . such as .bpm and .dur(ation) indicate numeric value

see the beautiful mess of a dictionary in mtag.py for the default mappings (should cover mp3,opus,flac,m4a,wav,aif,)

--no-mutagen disables mutagen and uses ffprobe instead, which...

  • is about 20x slower than mutagen
  • catches a few tags that mutagen doesn't
    • melodic key, video resolution, framerate, pixfmt
  • avoids pulling any GPL code into copyparty
  • more importantly runs ffprobe on incoming files which is bad if your ffmpeg has a cve

file parser plugins

copyparty can invoke external programs to collect additional metadata for files using mtp (either as argument or volume flag), there is a default timeout of 30sec

  • -mtp .bpm=~/bin/audio-bpm.py will execute ~/bin/audio-bpm.py with the audio file as argument 1 to provide the .bpm tag, if that does not exist in the audio metadata
  • -mtp key=f,t5,~/bin/audio-key.py uses ~/bin/audio-key.py to get the key tag, replacing any existing metadata tag (f,), aborting if it takes longer than 5sec (t5,)
  • -v ~/music::r:cmtp=.bpm=~/bin/audio-bpm.py:cmtp=key=f,t5,~/bin/audio-key.py both as a per-volume config wow this is getting ugly

but wait, there's more! -mtp can be used for non-audio files as well using the a flag: ay only do audio files, an only do non-audio files, or ad do all files (d as in dontcare)

  • -mtp ext=an,~/bin/file-ext.py runs ~/bin/file-ext.py to get the ext tag only if file is not audio (an)
  • -mtp arch,built,ver,orig=an,eexe,edll,~/bin/exe.py runs ~/bin/exe.py to get properties about windows-binaries only if file is not audio (an) and file extension is exe or dll

complete examples

  • read-only music server with bpm and key scanning
    python copyparty-sfx.py -v /mnt/nas/music:/music:r -e2dsa -e2ts -mtp .bpm=f,audio-bpm.py -mtp key=f,audio-key.py

browser support

copyparty-ie4-fs8

ie = internet-explorer, ff = firefox, c = chrome, iOS = iPhone/iPad, Andr = Android

feature ie6 ie9 ie10 ie11 ff 52 c 49 iOS Andr
browse files yep yep yep yep yep yep yep yep
basic uploader yep yep yep yep yep yep yep yep
make directory yep yep yep yep yep yep yep yep
send message yep yep yep yep yep yep yep yep
set sort order - yep yep yep yep yep yep yep
zip selection - yep yep yep yep yep yep yep
directory tree - - *1 yep yep yep yep yep
up2k - - yep yep yep yep yep yep
markdown editor - - yep yep yep yep yep yep
markdown viewer - - yep yep yep yep yep yep
play mp3/m4a - yep yep yep yep yep yep yep
play ogg/opus - - - - yep yep *2 yep
thumbnail view - - - - yep yep yep yep
image viewer - - - - yep yep yep yep
= feature = ie6 ie9 ie10 ie11 ff 52 c 49 iOS Andr
  • internet explorer 6 to 8 behave the same
  • firefox 52 and chrome 49 are the last winxp versions
  • *1 only public folders (login session is dropped) and no history / back-button
  • *2 using a wasm decoder which can sometimes get stuck and consumes a bit more power

quick summary of more eccentric web-browsers trying to view a directory index:

browser will it blend
safari (14.0.3/macos) is chrome with janky wasm, so playing opus can deadlock the javascript engine
safari (14.0.1/iOS) same as macos, except it recovers from the deadlocks if you poke it a bit
links (2.21/macports) can browse, login, upload/mkdir/msg
lynx (2.8.9/macports) can browse, login, upload/mkdir/msg
w3m (0.5.3/macports) can browse, login, upload at 100kB/s, mkdir/msg
netsurf (3.10/arch) is basically ie6 with much better css (javascript has almost no effect)
ie4 and netscape 4.0 can browse (text is yellow on white), upload with ?b=u
SerenityOS (7e98457) hits a page fault, works with ?b=u, file upload not-impl

client examples

  • javascript: dump some state into a file (two separate examples)

    • await fetch('https://127.0.0.1:3923/', {method:"PUT", body: JSON.stringify(foo)});
    • var xhr = new XMLHttpRequest(); xhr.open('POST', 'https://127.0.0.1:3923/msgs?raw'); xhr.send('foo');
  • curl/wget: upload some files (post=file, chunk=stdin)

    • post(){ curl -b cppwd=wark http://127.0.0.1:3923/ -F act=bput -F f=@"$1";}
      post movie.mkv
    • post(){ wget --header='Cookie: cppwd=wark' http://127.0.0.1:3923/?raw --post-file="$1" -O-;}
      post movie.mkv
    • chunk(){ curl -b cppwd=wark http://127.0.0.1:3923/ -T-;}
      chunk <movie.mkv
  • FUSE: mount a copyparty server as a local filesystem

  • sharex (screenshot utility): see ./contrib/sharex.sxcu

copyparty returns a truncated sha512sum of your PUT/POST as base64; you can generate the same checksum locally to verify uplaods:

b512(){ printf "$((sha512sum||shasum -a512)|sed -E 's/ .*//;s/(..)/\\x\1/g')"|base64|tr '+/' '-_'|head -c44;}
b512 <movie.mkv

up2k

quick outline of the up2k protocol, see uploading for the web-client

  • the up2k client splits a file into an "optimal" number of chunks
    • 1 MiB each, unless that becomes more than 256 chunks
    • tries 1.5M, 2M, 3, 4, 6, ... until <= 256 chunks or size >= 32M
  • client posts the list of hashes, filename, size, last-modified
  • server creates the wark, an identifier for this upload
    • sha512( salt + filesize + chunk_hashes )
    • and a sparse file is created for the chunks to drop into
  • client uploads each chunk
    • header entries for the chunk-hash and wark
    • server writes chunks into place based on the hash
  • client does another handshake with the hashlist; server replies with OK or a list of chunks to reupload

performance

defaults are good for most cases, don't mind the cannot efficiently use multiple CPU cores message, it's very unlikely to be a problem

below are some tweaks roughly ordered by usefulness:

  • -q disables logging and can help a bunch, even when combined with -lo to redirect logs to file

  • --http-only or --https-only (unless you want to support both protocols) will reduce the delay before a new connection is established

  • --hist pointing to a fast location (ssd) will make directory listings and searches faster when -e2d or -e2t is set

  • --no-hash when indexing a network-disk if you don't care about the actual filehashes and only want the names/tags searchable

  • -j enables multiprocessing (actual multithreading) and can make copyparty perform better in cpu-intensive workloads, for example:

    • huge amount of short-lived connections
    • really heavy traffic (downloads/uploads)

    ...however it adds an overhead to internal communication so it might be a net loss, see if it works 4 u

dependencies

  • jinja2 (is built into the SFX)

optional dependencies

enable music tags:

  • either mutagen (fast, pure-python, skips a few tags, makes copyparty GPL? idk)
  • or FFprobe (20x slower, more accurate, possibly dangerous depending on your distro and users)

enable thumbnails of images:

  • Pillow (requires py2.7 or py3.5+)

enable thumbnails of videos:

  • ffmpeg and ffprobe somewhere in $PATH

enable thumbnails of HEIF pictures:

  • pyheif-pillow-opener (requires Linux or a C compiler)

enable thumbnails of AVIF pictures:

  • pillow-avif-plugin

install recommended deps

python -m pip install --user -U jinja2 mutagen Pillow

optional gpl stuff

some bundled tools have copyleft dependencies, see ./bin/#mtag

these are standalone programs and will never be imported / evaluated by copyparty, and must be enabled through -mtp configs

sfx

currently there are two self-contained "binaries":

launch either of them (use sfx.py on systemd) and it'll unpack and run copyparty, assuming you have python installed of course

pls note that copyparty-sfx.sh will fail if you rename copyparty-sfx.py to copyparty.py and keep it in the same folder because sys.path is funky

sfx repack

if you don't need all the features, you can repack the sfx and save a bunch of space; all you need is an sfx and a copy of this repo (nothing else to download or build, except if you're on windows then you need msys2 or WSL)

  • 525k size of original sfx.py as of v0.11.30
  • 315k after ./scripts/make-sfx.sh re no-ogv
  • 223k after ./scripts/make-sfx.sh re no-ogv no-cm

the features you can opt to drop are

  • ogv.js, the opus/vorbis decoder which is needed by apple devices to play foss audio files
  • cm/easymde, the "fancy" markdown editor

for the repack to work, first run one of the sfx'es once to unpack it

note: you can also just download and run scripts/copyparty-repack.sh -- this will grab the latest copyparty release from github and do a no-ogv no-cm repack; works on linux/macos (and windows with msys2 or WSL)

install on android

install Termux (see ocv.me/termux) and then copy-paste this into Termux (long-tap) all at once:

apt update && apt -y full-upgrade && termux-setup-storage && apt -y install python && python -m ensurepip && python -m pip install -U copyparty
echo $?

after the initial setup, you can launch copyparty at any time by running copyparty anywhere in Termux

building

dev env setup

mostly optional; if you need a working env for vscode or similar

python3 -m venv .venv
. .venv/bin/activate
pip install jinja2  # mandatory
pip install mutagen  # audio metadata
pip install Pillow pyheif-pillow-opener pillow-avif-plugin  # thumbnails
pip install black bandit pylint flake8  # vscode tooling

just the sfx

unless you need to modify something in the web-dependencies, it's faster to grab those from a previous release:

rm -rf copyparty/web/deps
curl -L https://github.com/9001/copyparty/releases/latest/download/copyparty-sfx.py >x.py
python3 x.py -h
rm x.py
mv /tmp/pe-copyparty/copyparty/web/deps/ copyparty/web/deps/

then build the sfx using any of the following examples:

./scripts/make-sfx.sh  # both python and sh editions
./scripts/make-sfx.sh no-sh gz  # just python with gzip

complete release

also builds the sfx so disregard the sfx section above

in the scripts folder:

  • run make -C deps-docker to build all dependencies
  • git tag v1.2.3 && git push origin --tags
  • create github release with make-tgz-release.sh
  • upload to pypi with make-pypi-release.(sh|bat)
  • create sfx with make-sfx.sh

todo

roughly sorted by priority

  • hls framework for Someone Else to drop code into :^)
  • readme.md as epilogue

discarded ideas

  • reduce up2k roundtrips
    • start from a chunk index and just go
    • terminate client on bad data
      • not worth the effort, just throw enough conncetions at it
  • single sha512 across all up2k chunks?
    • crypto.subtle cannot into streaming, would have to use hashwasm, expensive
  • separate sqlite table per tag
    • performance fixed by skipping some indexes (+mt.k)
  • audio fingerprinting
    • only makes sense if there can be a wasm client and that doesn't exist yet (except for olaf which is agpl hence counts as not existing)
  • os.copy_file_range for up2k cloning
    • almost never hit this path anyways
  • up2k partials ui
    • feels like there isn't much point
  • cache sha512 chunks on client
    • too dangerous
  • comment field
    • nah
  • look into android thumbnail cache file format
    • absolutely not
  • indexedDB for hashes, cfg enable/clear/sz, 2gb avail, ~9k for 1g, ~4k for 100m, 500k items before autoeviction
    • blank hashlist when up-ok to skip handshake
      • too many confusing side-effects

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