Broadcastr

Vendor lock-free stateless alternative to blastr with additional features:

• relay discovery
• spam filtering
• event filtering
  • kind
    • possible per relay as well
  • authors
  • mentions
    • stranger responded/reacted to allowed author
    • stranger's event was responded/reacted by allowed author
    • additional spam detection heuristics are applied for the strangers
  • PoW
• gossip
• subscribe to events (of particular authors and event kinds) and distribute them automatically
  • won't transmit protected events by default
• tor/onion relays
• relays ignore list
• minimizes the risk of being rate-limited by relays
  • it checks whether event is already published on a certain relay

Changelogs.

Install

From crates.io

cargo install --locked broadcastr

From git

cargo install --locked --force --git https://github.com/codonaft/broadcastr

Run

broadcastr \
  --listen ws://localhost:8080 \
  --relays https://codonaft.com/relays.json \
  --read-relays wss://monitorlizard.nostr1.com,wss://relay.nostr.watch,wss://relaypag.es

💡 Usage 👁️

Usage: broadcastr [--listen <listen>] [--relays <relays>] [--read-relays <read-relays>] [--block-relays <block-relays>] [--block-ttl <block-ttl>] [--kinds <kinds>] [--pubkeys <pubkeys>] [--no-mentions] [--subscribe] [--no-protect] [--no-gossip-discovery] [--no-nip66-discovery] [--no-azzamo] [--tor-proxy <tor-proxy>] [--proxy <proxy>] [--log-level <log-level>] [--max-relays <max-relays>] [--max-events-by-author-per-min <max-events-by-author-per-min>] [--max-events-by-ip-per-min <max-events-by-ip-per-min>] [--max-events-per-min <max-events-per-min>] [--min-pow <min-pow>] [--max-tags <max-tags>] [--update-interval <update-interval>] [--max-backoff-interval <max-backoff-interval>] [--connect-timeout <connect-timeout>] [--request-timeout <request-timeout>] [--relay-info <relay-info>] [--redirect <redirect>] [--max-msg-size <max-msg-size>] [--tcp-backlog <tcp-backlog>] [--max-frame-size <max-frame-size>]

Broadcast Nostr events to other relays

Options:
  --listen          the listener ws URI (e.g. "ws://localhost:8080")
  --relays          relays or relay-list URIs in a descending order of priority
                    (comma-separated, optionally with per relay event kind
                    allow-list, e.g.
                    "https://codonaft.com/relays.json,file:///path/to/relays-in-array.json,wss://user.kindpag.es#k=0+3+10002,ws://1.2.3.4:5678")
  --read-relays     same, but for read-only relays; overrides the --relays
                    entries
  --block-relays    same, but for ignored relays; put public URL to your
                    broadcastr here to avoid loops
  --block-ttl       store automatically blocked relays for given amount (default
                    is 2h)
  --kinds           allow some event kinds only (comma-separated allow-list, e.g
                    "0,1,3,5,6,7,4550,34550")
  --pubkeys         allow authors or mentioned authors only (comma-separated
                    hex/bech32/NIP-21 allow-list)
  --no-mentions     disallow mentions of the allowed authors' events and events
                    that the authors have mentioned
  --subscribe       subscribe and automatically distribute all allowed events
                    (including mentions)
  --no-protect      ignore NIP-70 protection tag for the automatically
                    distributed events
  --no-gossip-discovery
                    don't discover additional relays from user profiles
  --no-nip66-discovery
                    don't discover additional relays using NIP-66
  --no-azzamo       don't use azzamo.net for spam filtering
  --tor-proxy       connect to tor onion relays using socks5 proxy (e.g.
                    "127.0.0.1:9050")
  --proxy           make all connections using socks5 proxy
  --log-level       log level (default is info)
  --max-relays      limit the connection pool
  --max-events-by-author-per-min
                    limit events by author (default is 5)
  --max-events-by-ip-per-min
                    limit events by IP (default is 50)
  --max-events-per-min
                    limit all events (default is 1000)
  --min-pow         proof of work difficulty limit
  --max-tags        max tags allowed for non-kind-3 events (default is 32)
  --update-interval relays and spam-lists update interval (default is 15m)
  --max-backoff-interval
                    max update backoff interval (default is 5m)
  --connect-timeout connection timeout (default is 15s)
  --request-timeout request timeout (default is 10s)
  --relay-info      relay info NIP-11 JSON
  --redirect        redirect to a given URL when accessed from a browser
  --max-msg-size    event message size
  --tcp-backlog     max incoming connections per listener IP address
  --max-frame-size  ws frame size
  -h, --help        display usage information

🌐 nginx 👁️

http {
  map $http_upgrade $connection_upgrade {
    default upgrade;
    '' close;
  }

  real_ip_header X-Forwarded-For;
  real_ip_recursive on;

  server {
    location / {
      proxy_http_version 1.1;
      proxy_connect_timeout 20s;
      proxy_socket_keepalive on;
      proxy_send_timeout 365d;
      proxy_read_timeout 365d;

      proxy_request_buffering off;
      proxy_buffering off;

      proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;

      proxy_set_header Upgrade $http_upgrade;
      proxy_set_header Connection "upgrade";

      proxy_pass http://localhost:8080/;
    }
  }
}

▶ ⚙️ OpenRC

TODO

• make it compatible with ordinary clients (besides nak)
  • support delivery of multiple events over the same connection
  • response with vary header
• support azzamo ban api
• use client IP (requires X-Forwarded-For or X-Real-IP request header in your reverse proxy)
  • rate-limit
  • allow-list
    • which overrides pubkeys allow-list?
    • disables rate-limit for tor exit nodes?
• use follower list as allow-list
• use REQ filter as allow-list?
  • e.g. allow events that ping a certain npub
    • limit number of p tags for events by strangers to avoid spam
• deduplicate concurrently sent events
• option to subscribe to a certain REQ filter and automatically broadcast such events
  • with auto added authors and since
  • don't disconnect from relays specified in 10002 of the allowed npubs, keep reading from them?
• NIP-11
  • custom relay info
  • don't serialize null?
• custom http page or a redirect
• improve RAM usage
  • run memory profiler
  • disconnect from relays?
    • that previously didn't receive events with the same kind?
    • that closed connections after we sent them event?
    • option to disconnect after timeout?
    • which are NIP-42-only ("auth-required"/"auth failed")
    • ban relays that didn't receive the known kinds
    • relays that fail due to TLS or DNS
  • make sure we don't attempt to connect to faulty relays
    • retry to connect with an exponential backoff?
• add metrics
• endpoint that returns a healthy relay list?
• socks5/http proxy for all connections
• login to NIP-42 relays?
  • does it make sense transmitting someone else's events from a generated nsec?
• option to ignore TLS issues?
  • disallow for NIP-59 and NIP-70?
• per relay event kind allow-list
• find newest replaceable and addressable events and broadcast them instead
• allow transmission of others' events mentioned by allowed authors
  • except for NIP-56 reported events and NIP-59 gift wraps
• disallow potentially spammy events from strangers that mention allowed authors
  • check how fast the stranger responded
    • responding to a long enough article too fast is a red flag
  • check if the stranger is listed in authors' subscriptions
  • check spam reports on the stranger? check in mute-lists?
    • the reports/mute-lists might not be trustworthy, but happened due to some interpersonal conflict
    • if it's a new event—there will not be any reports yet
      • put possibly spammy events to quarantine period and recheck later before transmitting?
    • check whether it was labeled by a trusted spam detector bot?
    • packs?
      • https://yakihonne.com/pack/s?d=6ab8b4c3-8204-40bc-934a-d08befdb491f
        • contains actually useful alert bot?
      • https://yakihonne.com/pack/s?d=74df1677-7894-49d9-871b-a53b6ad7ae21
      • https://yakihonne.com/pack/s?d=1f1xhzlldibr
  • check the age of the stranger?
    • count their public posts and comments?
  • check trust rank?
  • in this example, allow event 6cb47b0680acb9ec08cce944a1350de030e3be63e402d2eaec01805de757a41a but not 0000ae5c088c3653f76642756833ea9b52dde0d7eb75ea2b69c609221043a0aa
    • spammy events can be shared by legit npubs
• act as a proxy for REQs?
  • a RAM-cached proxy for all transmitted events?
  • a proxy to a list of relays?
• act as a NIP-59 gift wrap proxy?
  • receive events from NIP-42 authenticated users only, WS only
  • distribute to relevant 10050 relay lists
  • ignore broken DM relays
  • make it addable as a bot to a concord community to improve private group messages transmission?
• option to make all discovered relays read only?
• read blocked relays from event kind 10006

Support

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License

MIT/Apache-2.0