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README.md
About
Sometimes, you just need a way to randomly display media from your filesystem.
Simply point this tool at one or more directories, and then open the specified port (default 8080) in your browser.
A new file will be selected if you open / directly, or if you click on any displayed files.
Browser history is preserved, so you can always go back to any previously displayed media.
Feature requests, code criticism, bug reports, general chit-chat, and unrelated angst accepted at roulette@seedno.de.
Static binary builds available here.
I only test the linux/amd64, linux/arm64, and windows/amd64 builds, the rest are all best-effort™.
x86_64 and ARM Docker images of latest version: oci.seedno.de/seednode/roulette:latest.
Dockerfile available here.
An example instance with most features enabled can be found here.
Admin prefix
You can restrict access to certain functionality (the REST API and profiling endpoints) by prepending a secret string to the paths.
For example, providing the --admin-prefix=abc123 flag will register the index rebuild path as /abc123/index/rebuild.
The restricted paths are:
/debug/pprof/allocs/debug/pprof/block/debug/pprof/cmdline/debug/pprof/goroutine/debug/pprof/heap/debug/pprof/mutex/debug/pprof/profile/debug/pprof/symbol/debug/pprof/threadcreate/debug/pprof/trace/extensions/available/extensions/enabled/index//index/rebuild/types/available/types/enabled
While this might thwart very basic attacks, the proper solution for most use cases would likely be to add authentication via a reverse proxy.
API
If the --api flag is passed, a number of REST endpoints are registered.
The first of these—/index/—responds to GET requests with the contents of the index, in JSON format.
The second—/index/rebuild—responds to POST requests by rebuilding the index.
This can prove useful when confirming whether the index is generated successfully, or whether a given file is in the index.
The remaining four endpoints respond to GET requests with information about the registered file types:
/extensions/available/extensions/enabled/types/available/types/enabled
Filtering
You can provide a comma-delimited string of alphanumeric patterns to match via the include= query parameter, assuming the -f|--filter flag is enabled.
Only filenames matching one or more of the patterns will be served.
You can also provide a comma-delimited string of alphanumeric patterns to exclude, via the exclude= query parameter.
Filenames matching any of these patterns will not be served.
You can combine these two parameters, with exclusions taking priority over inclusions.
Both filtering parameters ignore the file extension and full path; they only compare against the bare filename.
Ignoring directories
If the --ignore <filename> flag is passed, any directory containing a file with the specified name will be skipped during the scanning stage.
Indexing
If the -i|--index flag is passed, all specified paths will be indexed on start.
This will slightly increase the delay before the application begins responding to requests, but should significantly speed up subsequent requests.
Automatic index rebuilds can be enabled via the --index-interval <duration> flag, which accepts time.Duration strings.
If --index-file <filename> is set, the index will be loaded from the specified file on start, and written to the file whenever it is re-generated.
The index file consists of zstd-compressed gobs.
Refresh
If the --refresh flag is passed and a positive-value refresh=<integer><unit> query parameter is provided, the page will reload after that interval.
This can be used to generate a sort of slideshow of files in any browser with Javascript support.
Pressing Spacebar will pause automatic refreshing until Spacebar is pressed again, the page is manually refreshed, or a new page is loaded.
Minimum accepted value is 500ms, as anything lower seems to cause inconsistent behavior. This might be changed in a future release.
Supported units are ns, us/µs, ms, s, m, and h.
Russian
If the --russian flag is passed, everything functions exactly as you would expect.
That is, files will be deleted after being served. This is not a joke, you will lose data.
This uses os.Remove() and checks to ensure the specified file is inside one of the paths passed to roulette.
That said, this has not been tested to any real extent, so only pass this flag on systems you don't care about.
Enjoy!
Sorting
You can specify a sorting direction via the sort= query parameter, assuming the -s|--sort flag is enabled.
A value of sort=asc means files will be served in ascending order (lowest-numbered to highest).
If a file exists with a numbered suffix one higher than the currently displayed file, it will be served next.
A value of sort=desc means files will be served in descending order (highest-numbered to lowest).
If a file exists with a numbered suffix one lower than the currently displayed file, it will be served next.
In either case, if no sequential file is found, a new random one will be chosen.
For sort=asc, the lowest-numbered file matching a given name will be served first.
For sort=desc, the highest-numbered file will be served instead.
If any other (or no) value is provided, the selected file will be random.
Note: These options require sequentially-numbered files matching the following pattern: filename[0-9]*.extension.
Themes
The --code handler provides syntax highlighting via alecthomas/chroma.
Any supported theme can be passed via the --code-theme flag.
By default, solarized-dark256 is used.
Usage output
Serves random media from the specified directories.
Usage:
roulette <path> [path]... [flags]
Flags:
--admin-prefix string string to prepend to administrative paths
-a, --all enable all supported file types
--allow-empty allow specifying paths containing no supported files
--api expose REST API
--audio enable support for audio files
-b, --bind string address to bind to (default "0.0.0.0")
--case-insensitive use case-insensitive matching for filters
--code enable support for source code files
--code-theme string theme for source code syntax highlighting (default "solarized-dark256")
--concurrency int maximum concurrency for scan threads (default 1024)
-d, --debug log file permission errors instead of simply skipping the files
--disable-buttons disable first/prev/next/last buttons
--exit-on-error shut down webserver on error, instead of just printing error
--fallback serve files as application/octet-stream if no matching format is registered
-f, --filter enable filtering
--flash enable support for shockwave flash files (via ruffle.rs)
--fun add a bit of excitement to your day
-h, --help help for roulette
--ignore string filename used to indicate directory should be skipped
--images enable support for image files
-i, --index generate index of supported file paths at startup
--index-file string path to optional persistent index file
--index-interval string interval at which to regenerate index (e.g. "5m" or "1h")
--max-file-count int skip directories with file counts above this value (default 2147483647)
--min-file-count int skip directories with file counts below this value
-p, --port int port to listen on (default 8080)
--prefix string root path for http handlers (for reverse proxying) (default "/")
--profile register net/http/pprof handlers
-r, --recursive recurse into subdirectories
--refresh enable automatic page refresh via query parameter
--russian remove selected images after serving
-s, --sort enable sorting
--text enable support for text files
-v, --verbose log accessed files and other information to stdout
-V, --version display version and exit
--video enable support for video files
Building the Docker container
From inside the docker/ subdirectory, build the image using the following command:
REGISTRY=<registry url> LATEST=yes TAG=alpine ./build.sh