OmniStream

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A single-binary, streaming file browser and previewer — point it at any local directory or S3-compatible object storage (MinIO / OSS / Ceph / R2 / …) and it instantly exposes them as a browsable, previewable HTTP service. The backend is built on axum + tokio + aws-sdk-s3, with one StorageBackend trait abstracting over every supported backend; a React SPA is bundled in, so opening http://<host>:<port>/ lets you walk directories, lazy-load thumbnails, and preview files in place. Preview supports:

• Images — png / jpg / gif / webp / avif / bmp / svg / ico
• Video — mp4 / webm / mov / mkv / m4v / ogv, with Range-based seeking
• Text / code — syntax highlighting by extension: json / yaml / toml / md / rs / ts / py / go / sql / shell / proto, and many more
• Anything else — generic fallback: icon + metadata + the browser's built-in viewer

Previewing files on S3 / S3-compatible storage requires the configured access key to hold both s3:GetObject (preview / download / HEAD) and s3:ListBucket (directory browsing / thumbnail listing). Missing either yields a 403 on the corresponding action. If you omit s3.bucket to use multi-bucket mode (see below), the credentials must additionally hold s3:ListAllMyBuckets so the root listing can enumerate every visible bucket. The local filesystem backend has no such requirement, but is restricted to the directory configured as local.root_path.

HTTP API (the bundled SPA is built on top of these — curl or your own client works just as well):

• GET /api/list?prefix=&page_token=&skip_pages= — browse a directory; optional skip_pages makes the server walk N pages internally and return the target page plus every intermediate token, so jumping to page N takes one round-trip instead of N
• GET /api/stat/{*key} — fetch file metadata
• GET /api/proxy/{*key} — stream the file, transparently forwarding Range, returning 200 / 206 as appropriate
• Embedded SPA fallback — anything not under /api/* falls back to index.html, so client-side routing just works

1. Install

Recommended: install via cargo (lands in ~/.cargo/bin/):

cargo install omni-stream    # requires Rust 1.91+

Or download a pre-built binary from GitHub Releases: https://github.com/maoXyzt/omni-stream/releases/latest. Three targets are published — x86_64-unknown-linux-gnu / x86_64-unknown-linux-musl / aarch64-apple-darwin. (Windows users can build from source). For pre-built binaries, extract, mark omni-stream executable, and put it on $PATH if you like.

Building from source, hacking on the frontend / backend, or contributing? See docs/development_guide.md. The release process lives in docs/how_to_release.md.

2. Configuration

config.toml lookup order (first hit wins):

1. $OMNI_CONFIG (absolute path, highest priority)
2. $XDG_CONFIG_HOME/omni-stream/config.toml
3. directories::ProjectDirs platform default (macOS: ~/Library/Application Support/omni-stream/; Linux: ~/.config/omni-stream/)
4. ./config.toml (current directory)

config.example.toml in the repo root works as a template. A minimal config:

[server]
host = "127.0.0.1"
port = 8080

[[storages]]
name = "local-data"
type = "local"
active = true
local = { root_path = "/var/lib/omni-stream" }

Or S3 / S3-compatible (MinIO / OSS):

[[storages]]
name = "production-s3"
type = "s3"
active = true
s3 = { endpoint = "http://minio.local:9000", bucket = "data", access_key = "...", secret_key = "..." }

s3.region defaults to us-east-1, which is fine for MinIO / LocalStack and AWS us-east-1 buckets — leave it out by default. Only set it when: (1) the target AWS bucket lives outside us-east-1, since SigV4 has to use the bucket's actual region (otherwise AWS returns AuthorizationHeaderMalformed); or (2) the S3-compatible gateway validates the region strictly (most don't).

s3.bucket is optional. Omit it (or set it to "*") to enable multi-bucket mode: the storage root performs ListBuckets, and every bucket the credentials can see appears as a top-level directory; navigating into one drills down with the usual prefix listing. The credentials must hold the s3:ListAllMyBuckets IAM permission. Example:

[[storages]]
name = "all-prod-s3"
type = "s3"
s3 = { endpoint = "http://minio.local:9000", access_key = "...", secret_key = "..." }

Multiple [[storages]] entries can coexist; on startup the one with active = true wins, and if none is active the first entry is used. The frontend also lets you switch between them at runtime.

Environment overrides (prefix OMNI_, separator _):

Authentication (optional)

By default /api/* is open — only suitable for trusted LAN environments. To enable Bearer token auth, add to your config:

[auth]
enabled = true
token = "any-long-random-string"

Or rely entirely on environment variables (keep the secret out of the config file):

OMNI_AUTH_ENABLED=true OMNI_AUTH_TOKEN=$(openssl rand -hex 32) ./omni-stream

Once enabled:

• All /api/* requests must carry Authorization: Bearer <token>, otherwise the server returns 401 plus WWW-Authenticate: Bearer realm="omni-stream".
• The embedded SPA (/, /assets/*) stays open — the browser has to load the page first before the user can enter a token. The first API call gets a 401, the SPA pops up a token input, stores it in localStorage, and attaches it to subsequent requests.
• TLS is out of scope — put nginx / caddy in front for HTTPS.

Config CLI

If you'd rather not copy config.example.toml by hand, the binary ships three config subcommands:

# List every candidate location in priority order, and mark which one the
# loader will pick.
omni-stream config list

# Lay down the bundled config.example.toml at one of the candidate paths
# (interactive selection, with a "custom path" option).
omni-stream config init

# Parse + validate. Surfaces missing fields, wrong types, or an empty
# `storages` list. Without an argument it checks the active path; pass a
# path to validate it directly.
omni-stream config check
omni-stream config check ./my-config.toml

The template config init writes is the verbatim config.example.toml from the repo, embedded into the binary — no external file required.

3. Run

If you installed via cargo install, omni-stream is already on $PATH:

# Use the config.toml found by the §2 lookup order
omni-stream

# Or point at a specific one
OMNI_CONFIG=/etc/omni-stream/config.toml omni-stream

# Or override just the port
OMNI_SERVER_PORT=8081 omni-stream

# Turn on request logging while debugging
RUST_LOG=info,tower_http=debug omni-stream

Tarballs from GitHub Releases don't add themselves to $PATH, so either run ./omni-stream from the extracted directory or move it somewhere like /usr/local/bin/.

After startup, opening http://<host>:<port>/ in a browser lands you on the embedded SPA. Ctrl-C / SIGTERM triggers a graceful shutdown (axum::serve + with_graceful_shutdown).

4. HTTP Error Semantics

Response bodies are uniformly {"error": "...", "message": "..."} JSON.