feat: add home assistant capability with pi-relay

Cargo.lock

@@ -906,6 +906,19 @@ dependencies = [
  "tracing-subscriber",
 ]
 
+[[package]]
+name = "noisebell-relay"
+version = "0.1.0"
+dependencies = [
+ "anyhow",
+ "axum",
+ "noisebell-common",
+ "reqwest",
+ "tokio",
+ "tracing",
+ "tracing-subscriber",
+]
+
 [[package]]
 name = "noisebell-rss"
 version = "0.1.0"

Cargo.toml

@@ -1,6 +1,7 @@
 [workspace]
 members = [
     "pi/pi-service",
+    "pi/pi-relay",
     "remote/noisebell-common",
     "remote/cache-service",
     "remote/rss-service",

README.md

@@ -1,5 +1,7 @@
 # Noisebell
 
+[![Space status](https://your-cache-domain.example.com/badge.svg)](https://your-cache-domain.example.com/status)
+
 Monitors the door at [Noisebridge](https://www.noisebridge.net) and tells you whether it's open or closed.
 
 A Raspberry Pi reads a magnetic sensor on the door and pushes state changes to a cache server. The cache keeps the latest state and fans updates out to chat integrations such as Discord and Zulip.

flake.nix

@@ -108,6 +108,23 @@
         cargoExtraArgs = "-p noisebell";
       };
 
+      piRelayArgs = {
+        inherit src;
+        pname = "noisebell-pi-relay";
+        version = "0.1.0";
+        strictDeps = true;
+        doCheck = false;
+
+        CARGO_BUILD_TARGET = "aarch64-unknown-linux-gnu";
+        CARGO_TARGET_AARCH64_UNKNOWN_LINUX_GNU_LINKER = "${crossPkgs.stdenv.cc.targetPrefix}cc";
+        TARGET_CC = "${crossPkgs.stdenv.cc.targetPrefix}cc";
+        CC_aarch64_unknown_linux_gnu = "${crossPkgs.stdenv.cc.targetPrefix}cc";
+        HOST_CC = "${pkgs.stdenv.cc.nativePrefix}cc";
+
+        depsBuildBuild = [ crossPkgs.stdenv.cc ];
+        cargoExtraArgs = "-p noisebell-relay";
+      };
+
       piArtifacts = piCraneLib.buildDepsOnly piArgs;
 
       noisebell-pi = piCraneLib.buildPackage (
@@ -117,6 +134,15 @@
         }
       );
 
+      piRelayArtifacts = piCraneLib.buildDepsOnly piRelayArgs;
+
+      noisebell-pi-relay = piCraneLib.buildPackage (
+        piRelayArgs
+        // {
+          cargoArtifacts = piRelayArtifacts;
+        }
+      );
+
       piStaticArgs = {
         inherit src;
         pname = "noisebell-pi-static";
@@ -134,6 +160,23 @@
         cargoExtraArgs = "-p noisebell";
       };
 
+      piRelayStaticArgs = {
+        inherit src;
+        pname = "noisebell-pi-relay-static";
+        version = "0.1.0";
+        strictDeps = true;
+        doCheck = false;
+
+        CARGO_BUILD_TARGET = "aarch64-unknown-linux-musl";
+        CARGO_TARGET_AARCH64_UNKNOWN_LINUX_MUSL_LINKER = "${muslPkgs.stdenv.cc.targetPrefix}cc";
+        TARGET_CC = "${muslPkgs.stdenv.cc.targetPrefix}cc";
+        CC_aarch64_unknown_linux_musl = "${muslPkgs.stdenv.cc.targetPrefix}cc";
+        HOST_CC = "${pkgs.stdenv.cc.nativePrefix}cc";
+
+        depsBuildBuild = [ muslPkgs.stdenv.cc ];
+        cargoExtraArgs = "-p noisebell-relay";
+      };
+
       piStaticArtifacts = piCraneLib.buildDepsOnly piStaticArgs;
 
       noisebell-pi-static = piCraneLib.buildPackage (
@@ -143,6 +186,15 @@
         }
       );
 
+      piRelayStaticArtifacts = piCraneLib.buildDepsOnly piRelayStaticArgs;
+
+      noisebell-pi-relay-static = piCraneLib.buildPackage (
+        piRelayStaticArgs
+        // {
+          cargoArtifacts = piRelayStaticArtifacts;
+        }
+      );
+
       piImageBaseModule =
         {
           lib,
@@ -359,7 +411,9 @@
 
       packages.aarch64-linux = {
         noisebell = noisebell-pi;
+        noisebell-relay = noisebell-pi-relay;
         noisebell-static = noisebell-pi-static;
+        noisebell-relay-static = noisebell-pi-relay-static;
         default = noisebell-pi;
       };
 

pi/README.md

@@ -111,25 +111,32 @@ scripts/deploy-pios-pi.sh pi@10.21.x.x
 That script:
 
 1. builds `.#packages.aarch64-linux.noisebell-static` locally
-2. decrypts the Pi-facing secrets locally with `agenix`
+2. builds `.#packages.aarch64-linux.noisebell-relay-static` locally
-3. uploads the binary and secrets to the Pi
+3. decrypts the Pi-facing secrets locally with `agenix`
-4. installs Tailscale and Avahi if needed
+4. uploads the binaries and secrets to the Pi
-5. writes `/etc/noisebell/noisebell.env`
+5. installs Tailscale and Avahi if needed
-6. installs `noisebell.service`
+6. writes `/etc/noisebell/noisebell.env`
-7. enables and starts the service
+7. writes `/etc/noisebell/noisebell-relay.env`
-8. runs `tailscale up` with the decrypted auth key
+8. installs `noisebell.service` and `noisebell-relay.service`
+9. enables and starts both services
+10. runs `tailscale up` with the decrypted auth key
 
 ## Files written on the Pi
 
 The deploy script creates:
 
 - `/opt/noisebell/releases/<timestamp>/noisebell`
+- `/opt/noisebell/releases/<timestamp>/noisebell-relay`
 - `/opt/noisebell/current` -> current release symlink
 - `/etc/noisebell/pi-to-cache-key`
 - `/etc/noisebell/cache-to-pi-key`
+- `/etc/noisebell/relay-webhook-secret`
+- `/etc/noisebell/homeassistant-webhook-id`
 - `/etc/noisebell/tailscale-auth-key`
 - `/etc/noisebell/noisebell.env`
+- `/etc/noisebell/noisebell-relay.env`
 - `/etc/systemd/system/noisebell.service`
+- `/etc/systemd/system/noisebell-relay.service`
 
 All secret files are root-only.
 
@@ -171,6 +178,34 @@ The deployed service uses these environment variables:
 | `NOISEBELL_BIND_ADDRESS` | `0.0.0.0` | HTTP bind address |
 | `NOISEBELL_ACTIVE_LOW` | `true` | Low GPIO = door open |
 
+## Relay service configuration
+
+The optional relay service accepts authenticated webhooks from cache-service and forwards them to Home Assistant on the local network.
+
+| Variable | Default | Description |
+|---|---|---|
+| `NOISEBELL_RELAY_PORT` | `8090` | HTTP port for the relay webhook endpoint |
+| `NOISEBELL_RELAY_BIND_ADDRESS` | `0.0.0.0` | HTTP bind address |
+| `NOISEBELL_RELAY_TARGET_BASE_URL` | `http://homeassistant.local:8123` | Base URL for Home Assistant |
+| `NOISEBELL_RELAY_TARGET_WEBHOOK_ID` | required | Home Assistant webhook ID |
+| `NOISEBELL_RELAY_INBOUND_API_KEY` | required | Bearer token expected from cache-service |
+| `NOISEBELL_RELAY_RETRY_ATTEMPTS` | `3` | Forward retry count |
+| `NOISEBELL_RELAY_RETRY_BASE_DELAY_SECS` | `1` | Exponential backoff base delay |
+| `NOISEBELL_RELAY_HTTP_TIMEOUT_SECS` | `10` | Outbound request timeout |
+
+Example cache target for the relay:
+
+```nix
+{
+  services.noisebell-cache.outboundWebhooks = [
+    {
+      url = "http://noisebell-pi.local:8090/webhook";
+      secretFile = /run/agenix/noisebell-relay-webhook-secret;
+    }
+  ];
+}
+```
+
 ## API
 
 All endpoints require `Authorization: Bearer <token>`.

pi/pi-relay/Cargo.toml

@@ -0,0 +1,16 @@
+[package]
+name = "noisebell-relay"
+version = "0.1.0"
+edition = "2021"
+
+[lints]
+workspace = true
+
+[dependencies]
+anyhow = "1.0"
+axum = "0.8"
+noisebell-common = { path = "../../remote/noisebell-common" }
+reqwest = { version = "0.12", default-features = false, features = ["json", "rustls-tls"] }
+tokio = { version = "1", features = ["rt-multi-thread", "macros", "net", "signal", "time"] }
+tracing = "0.1"
+tracing-subscriber = { version = "0.3", features = ["env-filter"] }

pi/pi-relay/src/main.rs

@@ -0,0 +1,148 @@
+use std::sync::Arc;
+use std::time::Duration;
+
+use anyhow::{Context, Result};
+use axum::extract::State;
+use axum::http::{HeaderMap, StatusCode};
+use axum::routing::{get, post};
+use axum::{Json, Router};
+use noisebell_common::{validate_bearer, WebhookPayload};
+use tracing::{error, info, warn};
+
+#[derive(Clone)]
+struct AppState {
+    client: reqwest::Client,
+    inbound_api_key: String,
+    target_url: String,
+    target_secret: Option<String>,
+    retry_attempts: u32,
+    retry_base_delay_secs: u64,
+}
+
+async fn post_webhook(
+    State(state): State<Arc<AppState>>,
+    headers: HeaderMap,
+    Json(payload): Json<WebhookPayload>,
+) -> StatusCode {
+    if !validate_bearer(&headers, &state.inbound_api_key) {
+        return StatusCode::UNAUTHORIZED;
+    }
+
+    info!(status = %payload.status, timestamp = payload.timestamp, "relay received webhook");
+
+    for attempt in 0..=state.retry_attempts {
+        let mut req = state.client.post(&state.target_url).json(&payload);
+        if let Some(secret) = &state.target_secret {
+            req = req.bearer_auth(secret);
+        }
+
+        match req.send().await {
+            Ok(resp) if resp.status().is_success() => {
+                info!(status = %payload.status, "relay forwarded webhook");
+                return StatusCode::OK;
+            }
+            result => {
+                let err_msg = match &result {
+                    Ok(resp) => format!("HTTP {}", resp.status()),
+                    Err(err) => err.to_string(),
+                };
+                if attempt == state.retry_attempts {
+                    error!(error = %err_msg, "relay failed to forward webhook after {} attempts", state.retry_attempts + 1);
+                    return StatusCode::BAD_GATEWAY;
+                }
+
+                let delay = Duration::from_secs(state.retry_base_delay_secs * 2u64.pow(attempt));
+                warn!(error = %err_msg, attempt = attempt + 1, "relay forward failed, retrying in {:?}", delay);
+                tokio::time::sleep(delay).await;
+            }
+        }
+    }
+
+    StatusCode::BAD_GATEWAY
+}
+
+async fn health() -> StatusCode {
+    StatusCode::OK
+}
+
+#[tokio::main]
+async fn main() -> Result<()> {
+    tracing_subscriber::fmt()
+        .with_env_filter(tracing_subscriber::EnvFilter::from_default_env())
+        .init();
+
+    let port: u16 = std::env::var("NOISEBELL_RELAY_PORT")
+        .unwrap_or_else(|_| "8090".into())
+        .parse()
+        .context("NOISEBELL_RELAY_PORT must be a valid u16")?;
+
+    let bind_address =
+        std::env::var("NOISEBELL_RELAY_BIND_ADDRESS").unwrap_or_else(|_| "0.0.0.0".into());
+
+    let inbound_api_key = std::env::var("NOISEBELL_RELAY_INBOUND_API_KEY")
+        .context("NOISEBELL_RELAY_INBOUND_API_KEY is required")?;
+
+    let target_base_url = std::env::var("NOISEBELL_RELAY_TARGET_BASE_URL")
+        .unwrap_or_else(|_| "http://homeassistant.local:8123".into())
+        .trim_end_matches('/')
+        .to_string();
+
+    let target_webhook_id = std::env::var("NOISEBELL_RELAY_TARGET_WEBHOOK_ID")
+        .context("NOISEBELL_RELAY_TARGET_WEBHOOK_ID is required")?;
+
+    let target_secret =
+        std::env::var("NOISEBELL_RELAY_TARGET_SECRET").ok().filter(|value| !value.is_empty());
+
+    let retry_attempts: u32 = std::env::var("NOISEBELL_RELAY_RETRY_ATTEMPTS")
+        .unwrap_or_else(|_| "3".into())
+        .parse()
+        .context("NOISEBELL_RELAY_RETRY_ATTEMPTS must be a valid u32")?;
+
+    let retry_base_delay_secs: u64 = std::env::var("NOISEBELL_RELAY_RETRY_BASE_DELAY_SECS")
+        .unwrap_or_else(|_| "1".into())
+        .parse()
+        .context("NOISEBELL_RELAY_RETRY_BASE_DELAY_SECS must be a valid u64")?;
+
+    let http_timeout_secs: u64 = std::env::var("NOISEBELL_RELAY_HTTP_TIMEOUT_SECS")
+        .unwrap_or_else(|_| "10".into())
+        .parse()
+        .context("NOISEBELL_RELAY_HTTP_TIMEOUT_SECS must be a valid u64")?;
+
+    let target_url = format!("{target_base_url}/api/webhook/{target_webhook_id}");
+
+    let client = reqwest::Client::builder()
+        .timeout(Duration::from_secs(http_timeout_secs))
+        .build()
+        .context("failed to build HTTP client")?;
+
+    let state = Arc::new(AppState {
+        client,
+        inbound_api_key,
+        target_url,
+        target_secret,
+        retry_attempts,
+        retry_base_delay_secs,
+    });
+
+    let app = Router::new()
+        .route("/health", get(health))
+        .route("/webhook", post(post_webhook))
+        .with_state(state);
+
+    let listener = tokio::net::TcpListener::bind((&*bind_address, port))
+        .await
+        .context(format!("failed to bind to {bind_address}:{port}"))?;
+
+    info!(port, "relay listening");
+
+    let mut sigterm = tokio::signal::unix::signal(tokio::signal::unix::SignalKind::terminate())
+        .context("failed to register SIGTERM handler")?;
+    axum::serve(listener, app)
+        .with_graceful_shutdown(async move {
+            sigterm.recv().await;
+        })
+        .await
+        .context("relay server error")?;
+
+    Ok(())
+}

remote/README.md

@@ -69,6 +69,7 @@ The flake exports a NixOS module for the hosted remote machine. It imports `agen
 | `secrets/pi-to-cache-key.age` | Pi + remote | Pi authenticates to cache `/webhook` |
 | `secrets/cache-to-pi-key.age` | Pi + remote | cache authenticates to Pi GET endpoints |
 | `secrets/discord-webhook-secret.age` | remote | cache authenticates to Discord bot `/webhook` |
+| `secrets/relay-webhook-secret.age` | Pi + remote | cache authenticates to the Pi relay `/webhook` |
 | `secrets/zulip-webhook-secret.age` | remote | cache authenticates to Zulip bridge `/webhook` |
 | `secrets/discord-token.age` | remote | Discord bot login |
 | `secrets/zulip-api-key.age` | remote | Zulip bot API authentication |

remote/cache-service/README.md

@@ -11,11 +11,24 @@ If the Pi stops responding to polls (configurable threshold, default 3 misses),
 | Method | Path | Auth | Description |
 |--------|------|------|-------------|
 | `GET` | `/status` | — | Current door status (`status`, `since`, `last_checked`) |
+| `GET` | `/badge.svg` | — | Live README badge with Noisebridge logo |
 | `POST` | `/webhook` | Bearer | Inbound webhook from the Pi |
 | `GET` | `/health` | — | Health check |
 
 `since` is the Pi-reported time when the current state began. `last_checked` is when the cache most recently attempted a poll.
 
+## Badge
+
+`/badge.svg` serves a classic shields.io-style SVG badge with the Noisebridge logo and the current cache status (`open`, `closed`, or `offline`).
+
+Use it in a GitHub README like this:
+
+```md
+[![Space status](https://your-cache-domain.example.com/badge.svg)](https://your-cache-domain.example.com/status)
+```
+
+That keeps the badge clickable and sends readers to the live `/status` endpoint.
+
 ## Configuration
 
 NixOS options under `services.noisebell-cache`:

remote/cache-service/src/api.rs

@@ -18,6 +18,86 @@ static OPEN_PNG: &[u8] = include_bytes!("../assets/open.png");
 static CLOSED_PNG: &[u8] = include_bytes!("../assets/closed.png");
 static OFFLINE_PNG: &[u8] = include_bytes!("../assets/offline.png");
 
+const BADGE_LABEL: &str = "space";
+const BADGE_HEIGHT: usize = 20;
+const BADGE_LOGO_WIDTH: usize = 21;
+const BADGE_LEFT_PADDING: usize = 6;
+const BADGE_RIGHT_PADDING: usize = 10;
+const BADGE_FONT_FAMILY: &str = "Verdana,Geneva,DejaVu Sans,sans-serif";
+const BADGE_LOGO_PATH: &str = "M215.863,155.875V65.776l-8.2,5.819l-22.357,15.869h-5.008V56.782c0.002-5.218-2.145-9.984-5.566-13.397c-3.412-3.421-8.177-5.567-13.396-5.565h-25.241c-1.08-6-3.964-11.391-8.092-15.517c-5.284-5.292-12.638-8.58-20.709-8.577c-8.072-0.003-15.427,3.286-20.71,8.579c-4.13,4.124-7.012,9.515-8.09,15.515H53.25c-5.218-0.001-9.983,2.144-13.396,5.565c-3.421,3.413-5.566,8.179-5.565,13.397v15.939L0.498,81.89l39.388,11.699L1.257,105.063l38.629,11.471L1.257,128.007L39.95,139.5l-5.661,1.694v23.675c-0.001,5.22,2.145,9.985,5.565,13.398c3.414,3.42,8.179,5.566,13.397,5.564h35.144v-5.194c0.001-5.234,2.105-9.927,5.533-13.366c3.437-3.429,8.129-5.533,13.365-5.533c5.234,0.004,9.927,2.107,13.362,5.533c3.429,3.439,5.533,8.132,5.536,13.366v5.194h35.143c5.221,0.002,9.985-2.145,13.397-5.564c3.421-3.416,5.566-8.181,5.566-13.398v-30.688h5.006L215.863,155.875z M192.152,126.306V95.344l13.321-9.455v49.872L192.152,126.306z M181.764,123.796h-21.126V97.854h21.126V123.796z M169.908,164.869c-0.002,2.356-0.954,4.476-2.523,6.053c-1.575,1.57-3.696,2.52-6.051,2.521h-25.241c-1.078-6.002-3.962-11.394-8.091-15.517c-5.287-5.29-12.641-8.58-20.71-8.576c-8.072-0.004-15.426,3.285-20.711,8.576c-4.128,4.123-7.012,9.515-8.09,15.517H53.25c-2.354-0.002-4.473-0.952-6.05-2.521c-1.57-1.577-2.521-3.699-2.523-6.053v-15.94l31.632-9.469l-38.564-11.453l38.628-11.473l-38.628-11.471l38.628-11.474L38.504,82.341l6.173-1.674V56.782c0.002-2.354,0.953-4.473,2.523-6.05c1.577-1.57,3.697-2.522,6.05-2.523h35.145v-5.194c0.001-5.236,2.105-9.927,5.533-13.364c3.437-3.428,8.129-5.532,13.364-5.535c5.235,0.001,9.925,2.107,13.361,5.535c3.431,3.438,5.535,8.13,5.535,13.364v5.194h35.145c2.354,0.001,4.474,0.953,6.051,2.523c1.57,1.578,2.522,3.696,2.522,6.05v30.684h-19.66v46.719h19.66v30.685H169.908z";
+
+fn escape_xml(text: &str) -> String {
+    text.replace('&', "&")
+        .replace('<', "&lt;")
+        .replace('>', "&gt;")
+        .replace('"', "&quot;")
+        .replace('\'', "&apos;")
+}
+
+fn badge_color(status: DoorStatus) -> &'static str {
+    match status {
+        DoorStatus::Open => "#34a853",
+        DoorStatus::Closed => "#e05d44",
+        DoorStatus::Offline => "#9f9f9f",
+    }
+}
+
+fn badge_text_width(text: &str) -> usize {
+    text.chars().count() * 7 + BADGE_RIGHT_PADDING
+}
+
+fn render_badge_svg(status: DoorStatus, summary: &str) -> String {
+    let message = status.as_str();
+    let label_width = BADGE_LEFT_PADDING + BADGE_LOGO_WIDTH + badge_text_width(BADGE_LABEL);
+    let message_width = badge_text_width(message);
+    let total_width = label_width + message_width;
+    let label_text_x = BADGE_LEFT_PADDING + BADGE_LOGO_WIDTH;
+    let label_center = label_text_x + (badge_text_width(BADGE_LABEL) / 2);
+    let message_center = label_width + (message_width / 2);
+    let escaped_summary = escape_xml(summary);
+
+    format!(
+        concat!(
+            "<svg xmlns=\"http://www.w3.org/2000/svg\" width=\"{total_width}\" height=\"{height}\" role=\"img\" aria-label=\"space status: {message}\">",
+            "<title>{summary}</title>",
+            "<linearGradient id=\"b\" x2=\"0\" y2=\"100%\">",
+            "<stop offset=\"0\" stop-color=\"#fff\" stop-opacity=\".7\"/>",
+            "<stop offset=\".1\" stop-opacity=\".1\"/>",
+            "<stop offset=\".9\" stop-opacity=\".3\"/>",
+            "<stop offset=\"1\" stop-opacity=\".5\"/>",
+            "</linearGradient>",
+            "<mask id=\"a\"><rect width=\"{total_width}\" height=\"{height}\" rx=\"3\" fill=\"#fff\"/></mask>",
+            "<g mask=\"url(#a)\">",
+            "<rect width=\"{label_width}\" height=\"{height}\" fill=\"#555\"/>",
+            "<rect x=\"{label_width}\" width=\"{message_width}\" height=\"{height}\" fill=\"{color}\"/>",
+            "<rect width=\"{total_width}\" height=\"{height}\" fill=\"url(#b)\"/>",
+            "</g>",
+            "<g fill=\"#fff\" text-anchor=\"middle\" font-family=\"{font_family}\" font-size=\"11\">",
+            "<g transform=\"translate({logo_x} 3) scale(0.055)\">",
+            "<path fill=\"#eb2026\" d=\"{logo_path}\"/>",
+            "</g>",
+            "<text x=\"{label_center}\" y=\"15\" fill=\"#010101\" fill-opacity=\".3\">{label}</text>",
+            "<text x=\"{label_center}\" y=\"14\">{label}</text>",
+            "<text x=\"{message_center}\" y=\"15\" fill=\"#010101\" fill-opacity=\".3\">{message}</text>",
+            "<text x=\"{message_center}\" y=\"14\">{message}</text>",
+            "</g></svg>",
+        ),
+        total_width = total_width,
+        height = BADGE_HEIGHT,
+        label = BADGE_LABEL,
+        message = message,
+        summary = escaped_summary,
+        label_width = label_width,
+        message_width = message_width,
+        color = badge_color(status),
+        font_family = BADGE_FONT_FAMILY,
+        logo_x = BADGE_LEFT_PADDING,
+        logo_path = BADGE_LOGO_PATH,
+        label_center = label_center,
+        message_center = message_center,
+    )
+}
+
 pub struct AppState {
     pub db: Arc<Mutex<rusqlite::Connection>>,
     pub client: reqwest::Client,
@@ -244,6 +324,35 @@ pub async fn get_image(State(state): State<Arc<AppState>>) -> Response {
         .into_response()
 }
 
+pub async fn get_badge(State(state): State<Arc<AppState>>) -> Response {
+    let db = state.db.clone();
+    let status = match tokio::task::spawn_blocking(move || {
+        let conn = db.blocking_lock();
+        db::get_status(&conn)
+    })
+    .await
+    .expect("db task panicked")
+    {
+        Ok(status) => status,
+        Err(e) => {
+            error!(error = %e, "failed to get status for badge");
+            return StatusCode::INTERNAL_SERVER_ERROR.into_response();
+        }
+    };
+
+    let summary = status_summary(status.status, status.since, status.last_checked, unix_now());
+    let badge = render_badge_svg(status.status, &summary);
+
+    (
+        [
+            (header::CONTENT_TYPE, "image/svg+xml; charset=utf-8"),
+            (header::CACHE_CONTROL, "public, max-age=5"),
+        ],
+        badge,
+    )
+        .into_response()
+}
+
 #[cfg(test)]
 mod tests {
     use super::*;
@@ -264,4 +373,16 @@ mod tests {
         assert!(summary.contains("Last checked"));
         assert!(summary.contains("55 seconds ago"));
     }
+
+    #[test]
+    fn render_badge_svg_includes_status_and_summary() {
+        let svg = render_badge_svg(DoorStatus::Offline, "Cache can't reach the space right now.");
+
+        assert!(svg.contains("aria-label=\"space status: offline\""));
+        assert!(svg.contains(">space<"));
+        assert!(svg.contains(">offline<"));
+        assert!(svg.contains("Cache can&apos;t reach the space right now."));
+        assert!(svg.contains("#9f9f9f"));
+        assert!(svg.contains("#eb2026"));
+    }
 }

remote/cache-service/src/main.rs

@@ -127,6 +127,7 @@ async fn main() -> Result<()> {
         .route("/health", get(api::health))
         .route("/webhook", post(api::post_webhook))
         .route("/status", get(api::get_status))
+        .route("/badge.svg", get(api::get_badge))
         .route("/image", get(api::get_image))
         .route("/image/open.png", get(api::get_image_open))
         .route("/image/closed.png", get(api::get_image_closed))

remote/hosted-module.nix

@@ -12,10 +12,20 @@ in
 
   users.groups.noisebell = { };
 
-  users.users.noisebell-cache.extraGroups = lib.mkIf cfgCache.enable [ "noisebell" ];
+  users.users = lib.mkMerge [
-  users.users.noisebell-rss.extraGroups = lib.mkIf cfgRss.enable [ "noisebell" ];
+    (lib.mkIf cfgCache.enable {
-  users.users.noisebell-discord.extraGroups = lib.mkIf cfgDiscord.enable [ "noisebell" ];
+      noisebell-cache.extraGroups = [ "noisebell" ];
-  users.users.noisebell-zulip.extraGroups = lib.mkIf cfgZulip.enable [ "noisebell" ];
+    })
+    (lib.mkIf cfgRss.enable {
+      noisebell-rss.extraGroups = [ "noisebell" ];
+    })
+    (lib.mkIf cfgDiscord.enable {
+      noisebell-discord.extraGroups = [ "noisebell" ];
+    })
+    (lib.mkIf cfgZulip.enable {
+      noisebell-zulip.extraGroups = [ "noisebell" ];
+    })
+  ];
 
   age.secrets.noisebell-pi-to-cache-key = {
     file = "${self}/secrets/pi-to-cache-key.age";
@@ -47,6 +57,12 @@ in
     mode = "0440";
   };
 
+  age.secrets.noisebell-relay-webhook-secret = {
+    file = "${self}/secrets/relay-webhook-secret.age";
+    group = "noisebell";
+    mode = "0440";
+  };
+
   age.secrets.noisebell-zulip-webhook-secret = {
     file = "${self}/secrets/zulip-webhook-secret.age";
     group = "noisebell";
@@ -68,30 +84,30 @@ in
     );
   };
 
-  services.noisebell-rss = lib.mkIf cfgRss.enable (
+  services.noisebell-rss.cacheUrl = lib.mkIf (cfgRss.enable && cfgCache.enable) (
-    lib.optionalAttrs cfgCache.enable {
+    lib.mkDefault "http://127.0.0.1:${toString cfgCache.port}"
-      cacheUrl = lib.mkDefault "http://127.0.0.1:${toString cfgCache.port}";
-    }
   );
 
-  services.noisebell-discord = lib.mkIf cfgDiscord.enable (
+  services.noisebell-discord.discordTokenFile = lib.mkIf cfgDiscord.enable (
-    {
+    lib.mkDefault config.age.secrets.noisebell-discord-token.path
-      discordTokenFile = lib.mkDefault config.age.secrets.noisebell-discord-token.path;
+  );
-      webhookSecretFile = lib.mkDefault config.age.secrets.noisebell-discord-webhook-secret.path;
+  services.noisebell-discord.webhookSecretFile = lib.mkIf cfgDiscord.enable (
-    }
+    lib.mkDefault config.age.secrets.noisebell-discord-webhook-secret.path
-    // lib.optionalAttrs cfgCache.enable {
+  );
-      cacheUrl = lib.mkDefault "http://127.0.0.1:${toString cfgCache.port}";
+  services.noisebell-discord.cacheUrl = lib.mkIf (cfgDiscord.enable && cfgCache.enable) (
-      imageBaseUrl = lib.mkDefault "https://${cfgCache.domain}/image";
+    lib.mkDefault "http://127.0.0.1:${toString cfgCache.port}"
-    }
+  );
+  services.noisebell-discord.imageBaseUrl = lib.mkIf (cfgDiscord.enable && cfgCache.enable) (
+    lib.mkDefault "https://${cfgCache.domain}/image"
   );
 
-  services.noisebell-zulip = lib.mkIf cfgZulip.enable (
+  services.noisebell-zulip.apiKeyFile = lib.mkIf cfgZulip.enable (
-    {
+    lib.mkDefault config.age.secrets.noisebell-zulip-api-key.path
-      apiKeyFile = lib.mkDefault config.age.secrets.noisebell-zulip-api-key.path;
+  );
-      webhookSecretFile = lib.mkDefault config.age.secrets.noisebell-zulip-webhook-secret.path;
+  services.noisebell-zulip.webhookSecretFile = lib.mkIf cfgZulip.enable (
-    }
+    lib.mkDefault config.age.secrets.noisebell-zulip-webhook-secret.path
-    // lib.optionalAttrs cfgCache.enable {
+  );
-      imageBaseUrl = lib.mkDefault "https://${cfgCache.domain}/image";
+  services.noisebell-zulip.imageBaseUrl = lib.mkIf (cfgZulip.enable && cfgCache.enable) (
-    }
+    lib.mkDefault "https://${cfgCache.domain}/image"
   );
 }

remote/zulip-bot/module.nix

@@ -10,8 +10,9 @@ in
     enable = lib.mkEnableOption "noisebell Zulip bridge";
 
     domain = lib.mkOption {
-      type = lib.types.str;
+      type = lib.types.nullOr lib.types.str;
-      description = "Domain for the Caddy virtual host.";
+      default = null;
+      description = "Optional domain for the Caddy virtual host.";
     };
 
     port = lib.mkOption {
@@ -57,51 +58,54 @@ in
     };
   };
 
-  config = lib.mkIf cfg.enable {
+  config = lib.mkIf cfg.enable (
-    users.users.noisebell-zulip = {
+    {
-      isSystemUser = true;
+      users.users.noisebell-zulip = {
-      group = "noisebell-zulip";
+        isSystemUser = true;
-    };
+        group = "noisebell-zulip";
-    users.groups.noisebell-zulip = { };
-
-    services.caddy.virtualHosts.${cfg.domain}.extraConfig = ''
-      reverse_proxy localhost:${toString cfg.port}
-    '';
-
-    systemd.services.noisebell-zulip = {
-      description = "Noisebell Zulip bridge";
-      wantedBy = [ "multi-user.target" ];
-      after = [ "network-online.target" ];
-      wants = [ "network-online.target" ];
-      environment = {
-        NOISEBELL_ZULIP_PORT = toString cfg.port;
-        NOISEBELL_ZULIP_SITE_URL = cfg.zulipUrl;
-        NOISEBELL_ZULIP_BOT_EMAIL = cfg.botEmail;
-        NOISEBELL_ZULIP_STREAM = cfg.stream;
-        NOISEBELL_ZULIP_TOPIC = cfg.topic;
-        NOISEBELL_ZULIP_IMAGE_BASE_URL = cfg.imageBaseUrl;
-        RUST_LOG = "info";
       };
-      script = ''
+      users.groups.noisebell-zulip = { };
-        export NOISEBELL_ZULIP_API_KEY="$(cat ${cfg.apiKeyFile})"
+
-        export NOISEBELL_ZULIP_WEBHOOK_SECRET="$(cat ${cfg.webhookSecretFile})"
+      systemd.services.noisebell-zulip = {
-        exec ${bin}
+        description = "Noisebell Zulip bridge";
+        wantedBy = [ "multi-user.target" ];
+        after = [ "network-online.target" ];
+        wants = [ "network-online.target" ];
+        environment = {
+          NOISEBELL_ZULIP_PORT = toString cfg.port;
+          NOISEBELL_ZULIP_SITE_URL = cfg.zulipUrl;
+          NOISEBELL_ZULIP_BOT_EMAIL = cfg.botEmail;
+          NOISEBELL_ZULIP_STREAM = cfg.stream;
+          NOISEBELL_ZULIP_TOPIC = cfg.topic;
+          NOISEBELL_ZULIP_IMAGE_BASE_URL = cfg.imageBaseUrl;
+          RUST_LOG = "info";
+        };
+        script = ''
+          export NOISEBELL_ZULIP_API_KEY="$(cat ${cfg.apiKeyFile})"
+          export NOISEBELL_ZULIP_WEBHOOK_SECRET="$(cat ${cfg.webhookSecretFile})"
+          exec ${bin}
+        '';
+        serviceConfig = {
+          Type = "simple";
+          Restart = "on-failure";
+          RestartSec = 5;
+          User = "noisebell-zulip";
+          Group = "noisebell-zulip";
+          NoNewPrivileges = true;
+          ProtectSystem = "strict";
+          ProtectHome = true;
+          PrivateTmp = true;
+          ProtectKernelTunables = true;
+          ProtectKernelModules = true;
+          ProtectControlGroups = true;
+          RestrictSUIDSGID = true;
+        };
+      };
+    }
+    // lib.mkIf (cfg.domain != null) {
+      services.caddy.virtualHosts.${cfg.domain}.extraConfig = ''
+        reverse_proxy localhost:${toString cfg.port}
       '';
-      serviceConfig = {
+    }
-        Type = "simple";
+  );
-        Restart = "on-failure";
-        RestartSec = 5;
-        User = "noisebell-zulip";
-        Group = "noisebell-zulip";
-        NoNewPrivileges = true;
-        ProtectSystem = "strict";
-        ProtectHome = true;
-        PrivateTmp = true;
-        ProtectKernelTunables = true;
-        ProtectKernelModules = true;
-        ProtectControlGroups = true;
-        RestrictSUIDSGID = true;
-      };
-    };
-  };
 }

scripts/deploy-pios-pi.sh

@@ -23,12 +23,19 @@ SSH_OPTS=(
 echo "Building static aarch64 Noisebell binary locally..."
 PACKAGE_PATH=$(nix build .#packages.aarch64-linux.noisebell-static --print-out-paths --no-link)
 BIN_PATH="$PACKAGE_PATH/bin/noisebell"
+RELAY_PACKAGE_PATH=$(nix build .#packages.aarch64-linux.noisebell-relay-static --print-out-paths --no-link)
+RELAY_BIN_PATH="$RELAY_PACKAGE_PATH/bin/noisebell-relay"
 
 if [[ ! -x "$BIN_PATH" ]]; then
   echo "built binary not found: $BIN_PATH" >&2
   exit 1
 fi
 
+if [[ ! -x "$RELAY_BIN_PATH" ]]; then
+  echo "built relay binary not found: $RELAY_BIN_PATH" >&2
+  exit 1
+fi
+
 if ! command -v agenix >/dev/null 2>&1; then
   echo "agenix is required in your shell to decrypt secrets locally" >&2
   exit 1
@@ -39,17 +46,22 @@ echo "Decrypting Pi secrets locally..."
   cd "$REPO_ROOT/secrets"
   RULES="$REPO_ROOT/secrets/secrets.nix" agenix -d pi-to-cache-key.age > "$TMP_DIR/pi-to-cache-key"
   RULES="$REPO_ROOT/secrets/secrets.nix" agenix -d cache-to-pi-key.age > "$TMP_DIR/cache-to-pi-key"
+  RULES="$REPO_ROOT/secrets/secrets.nix" agenix -d relay-webhook-secret.age > "$TMP_DIR/relay-webhook-secret"
+  RULES="$REPO_ROOT/secrets/secrets.nix" agenix -d homeassistant-webhook-id.age > "$TMP_DIR/homeassistant-webhook-id"
   RULES="$REPO_ROOT/secrets/secrets.nix" agenix -d tailscale-auth-key.age > "$TMP_DIR/tailscale-auth-key"
 )
 chmod 600 "$TMP_DIR"/*
 
 echo "Preparing remote directories on $TARGET_HOST..."
-ssh "${SSH_OPTS[@]}" "$TARGET_HOST" "mkdir -p '$REMOTE_TMP_DIR' && rm -f '$REMOTE_TMP_DIR/noisebell' '$REMOTE_TMP_DIR/pi-to-cache-key' '$REMOTE_TMP_DIR/cache-to-pi-key' '$REMOTE_TMP_DIR/tailscale-auth-key' && sudo mkdir -p '$REMOTE_RELEASE_DIR' /etc/noisebell /opt/noisebell/releases /var/lib/noisebell"
+ssh "${SSH_OPTS[@]}" "$TARGET_HOST" "mkdir -p '$REMOTE_TMP_DIR' && rm -f '$REMOTE_TMP_DIR/noisebell' '$REMOTE_TMP_DIR/noisebell-relay' '$REMOTE_TMP_DIR/pi-to-cache-key' '$REMOTE_TMP_DIR/cache-to-pi-key' '$REMOTE_TMP_DIR/relay-webhook-secret' '$REMOTE_TMP_DIR/homeassistant-webhook-id' '$REMOTE_TMP_DIR/tailscale-auth-key' && sudo mkdir -p '$REMOTE_RELEASE_DIR' /etc/noisebell /opt/noisebell/releases /var/lib/noisebell"
 
 echo "Uploading binary and secret files..."
 scp "${SSH_OPTS[@]}" "$BIN_PATH" "$TARGET_HOST:$REMOTE_TMP_DIR/noisebell"
+scp "${SSH_OPTS[@]}" "$RELAY_BIN_PATH" "$TARGET_HOST:$REMOTE_TMP_DIR/noisebell-relay"
 scp "${SSH_OPTS[@]}" "$TMP_DIR/pi-to-cache-key" "$TARGET_HOST:$REMOTE_TMP_DIR/pi-to-cache-key"
 scp "${SSH_OPTS[@]}" "$TMP_DIR/cache-to-pi-key" "$TARGET_HOST:$REMOTE_TMP_DIR/cache-to-pi-key"
+scp "${SSH_OPTS[@]}" "$TMP_DIR/relay-webhook-secret" "$TARGET_HOST:$REMOTE_TMP_DIR/relay-webhook-secret"
+scp "${SSH_OPTS[@]}" "$TMP_DIR/homeassistant-webhook-id" "$TARGET_HOST:$REMOTE_TMP_DIR/homeassistant-webhook-id"
 scp "${SSH_OPTS[@]}" "$TMP_DIR/tailscale-auth-key" "$TARGET_HOST:$REMOTE_TMP_DIR/tailscale-auth-key"
 
 echo "Installing service and Tailscale on $TARGET_HOST..."
@@ -76,11 +88,14 @@ fi
 sudo systemctl enable --now ssh avahi-daemon tailscaled
 
 sudo install -m 755 "$REMOTE_TMP_DIR/noisebell" "$REMOTE_RELEASE_DIR/noisebell"
+sudo install -m 755 "$REMOTE_TMP_DIR/noisebell-relay" "$REMOTE_RELEASE_DIR/noisebell-relay"
 sudo mv "$REMOTE_TMP_DIR/pi-to-cache-key" /etc/noisebell/pi-to-cache-key
 sudo mv "$REMOTE_TMP_DIR/cache-to-pi-key" /etc/noisebell/cache-to-pi-key
+sudo mv "$REMOTE_TMP_DIR/relay-webhook-secret" /etc/noisebell/relay-webhook-secret
+sudo mv "$REMOTE_TMP_DIR/homeassistant-webhook-id" /etc/noisebell/homeassistant-webhook-id
 sudo mv "$REMOTE_TMP_DIR/tailscale-auth-key" /etc/noisebell/tailscale-auth-key
-sudo chown root:root /etc/noisebell/pi-to-cache-key /etc/noisebell/cache-to-pi-key /etc/noisebell/tailscale-auth-key
+sudo chown root:root /etc/noisebell/pi-to-cache-key /etc/noisebell/cache-to-pi-key /etc/noisebell/relay-webhook-secret /etc/noisebell/homeassistant-webhook-id /etc/noisebell/tailscale-auth-key
-sudo chmod 600 /etc/noisebell/pi-to-cache-key /etc/noisebell/cache-to-pi-key /etc/noisebell/tailscale-auth-key
+sudo chmod 600 /etc/noisebell/pi-to-cache-key /etc/noisebell/cache-to-pi-key /etc/noisebell/relay-webhook-secret /etc/noisebell/homeassistant-webhook-id /etc/noisebell/tailscale-auth-key
 
 sudo tee /etc/noisebell/noisebell.env >/dev/null <<'ENVEOF'
 NOISEBELL_GPIO_PIN=17
@@ -96,6 +111,17 @@ RUST_LOG=info
 ENVEOF
 sudo chmod 600 /etc/noisebell/noisebell.env
 
+sudo tee /etc/noisebell/noisebell-relay.env >/dev/null <<'ENVEOF'
+NOISEBELL_RELAY_PORT=8090
+NOISEBELL_RELAY_BIND_ADDRESS=0.0.0.0
+NOISEBELL_RELAY_TARGET_BASE_URL=http://homeassistant.local:8123
+NOISEBELL_RELAY_RETRY_ATTEMPTS=3
+NOISEBELL_RELAY_RETRY_BASE_DELAY_SECS=1
+NOISEBELL_RELAY_HTTP_TIMEOUT_SECS=10
+RUST_LOG=info
+ENVEOF
+sudo chmod 600 /etc/noisebell/noisebell-relay.env
+
 sudo tee /etc/systemd/system/noisebell.service >/dev/null <<'UNITEOF'
 [Unit]
 Description=Noisebell GPIO door monitor
@@ -115,10 +141,29 @@ WatchdogSec=30
 WantedBy=multi-user.target
 UNITEOF
 
+sudo tee /etc/systemd/system/noisebell-relay.service >/dev/null <<'UNITEOF'
+[Unit]
+Description=Noisebell relay webhook bridge
+After=network-online.target
+Wants=network-online.target
+
+[Service]
+Type=simple
+EnvironmentFile=/etc/noisebell/noisebell-relay.env
+ExecStart=/bin/bash -lc 'export NOISEBELL_RELAY_INBOUND_API_KEY="$$(cat /etc/noisebell/relay-webhook-secret)"; export NOISEBELL_RELAY_TARGET_WEBHOOK_ID="$$(cat /etc/noisebell/homeassistant-webhook-id)"; exec /opt/noisebell/current/noisebell-relay'
+Restart=on-failure
+RestartSec=5
+
+[Install]
+WantedBy=multi-user.target
+UNITEOF
+
 sudo ln -sfn "$REMOTE_RELEASE_DIR" "$REMOTE_CURRENT_LINK"
 sudo systemctl daemon-reload
 sudo systemctl enable noisebell.service
+sudo systemctl enable noisebell-relay.service
 sudo systemctl restart noisebell.service
+sudo systemctl restart noisebell-relay.service
 sudo systemctl restart avahi-daemon
 
 sudo tailscale up --auth-key="$(sudo cat /etc/noisebell/tailscale-auth-key)" --hostname=noisebell-pi || true

scripts/nhs

@@ -0,0 +1,12 @@
+#!/usr/bin/env bash
+set -euo pipefail
+
+SCRIPT_DIR=$(cd -- "$(dirname -- "${BASH_SOURCE[0]}")" && pwd)
+REPO_ROOT=$(cd -- "$SCRIPT_DIR/.." && pwd)
+
+exec nixos-rebuild switch \
+  --flake /home/jet/Documents/extremist-software#extremist-software \
+  --target-host jet@extremist-software \
+  --sudo \
+  --override-input noisebell "$REPO_ROOT" \
+  "$@"

secrets/homeassistant-webhook-id.age

@@ -0,0 +1,9 @@
+age-encryption.org/v1
+-> ssh-ed25519 Ziw7aw o2OepqUVulb7kJMNRMs3MK4HjD9ufgXgPahtYydBbXk
+gFdMCu/Wk4q9g7xByhXyRIbdx7V45cwmxVn580WuFwM
+-> ssh-ed25519 NFB4qA fQRwLbNWTx/FWZBPjpbt4P0a2sZY3QR2szdRe1cfTE4
+DR0fSdupUNJfpnbB3Ogkp27me4J0IcQ6VVQmBKXlNoI
+-> X25519 fZhP22fLYaVseoaWRa+VPKqZ4aZFNibHgMp//vOp7AE
+JtwFvGYJEOD26cBhmSWrCNmFkigb/ku56xNXkYn4xMM
+--- pPugQ6fRUfnW6dG+GcIHDhAbn6/Za5g1vZmWZGXk3Wk
+Càü§<EFBFBD>
ìÖW™åQ]Ý1¼<31>`7ü"?‰ú]Uà9z²

secrets/relay-webhook-secret.age

@@ -0,0 +1,12 @@
+age-encryption.org/v1
+-> ssh-ed25519 Ziw7aw s7p6bAEzWqyyF4yGBGyYi4IAVMofpY+vofEdnAUASAo
+3iFJpniAgjy9r5oSDO0w288S80iKWniV36RUfMRRubc
+-> ssh-ed25519 NFB4qA eP/M902eua/ytCKABTrgcCV3vKDfuMlvg31b9jIc7E4
+OI/iXdRD/Km1qMRpx9h2Kabn6HWtwnHstushKZfyi+E
+-> X25519 dNnIn/Tq/llh8NBvrAMcVeKVMl8C1nq6gCvI+TpxOQI
+vOLTD/uROCiPnG42MioEqA1A8Ei/acmI75Eg7CIJuL4
+-> ssh-ed25519 uKftJg K2ZIMhMIEzvaowRkHk90FK9Xkq01qvBh+xZ1tZ5H8Cc
+QE/BLIS+2W+kdKEaJdgJHoGWMJ3TsVmx3DZ2+B3spDw
+--- qY2aDrsCm4Xs2AchoDxhQzfhWrGWLJ6Z5t8/4Gc5lF4
+4!£2ýF³ì[(C}
+ål<EFBFBD>m‰"×#kæNæL·è1

secrets/secrets.nix

@@ -35,6 +35,17 @@ in
     jet
     server
   ];
+  "homeassistant-webhook-id.age".publicKeys = [
+    jet
+    pi
+    piBootstrap
+  ];
+  "relay-webhook-secret.age".publicKeys = [
+    jet
+    pi
+    piBootstrap
+    server
+  ];
   "zulip-webhook-secret.age".publicKeys = [
     jet
     server