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websites.where.is.lassul.us: init
location of person.lass from home-assistant on an OSM map with a 24h trail;
neoprism polls the hass history API every 2 min into a static json,
token via clan vars (where-lassul-us/token)
author
lassulus
date
(Sep 9, 2026, 5:32 PM CEST)
commit
13604410
13604410c439b4c757e324cc7494ed897e7f71e6
parent
98b03a88
98b03a88b6f8c90bf58126d6665713c5740d16f9
+264
-1
+2
-1
2configs/dns/lassul.us.zone
+2
-1
2configs/dns/lassul.us.zone
···
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@ 3600 IN SOA lassul.us. ns1.lassul.us. 2026083000 7200 3600 86400 3600
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@ 3600 IN SOA lassul.us. ns1.lassul.us. 2026090800 7200 3600 86400 3600
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;;@ 3600 IN NS ns1
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@ 3600 IN NS ns1
···
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id IN CNAME neoprism
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covibe IN CNAME neoprism
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omni IN CNAME neoprism
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where.is IN CNAME neoprism
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;; Mail
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@ IN MX 3 mail
+3
machines/neoprism/config.nix
+3
machines/neoprism/config.nix
+110
2configs/websites/where.is.lassul.us/default.nix
+110
2configs/websites/where.is.lassul.us/default.nix
···
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{ config, pkgs, ... }:
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let
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domain = "where.is.lassul.us";
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# home-assistant on styx, reached over retiolum (same as hass/proxy.nix).
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hass = "http://styx.r:8123";
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entity = "person.lass";
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stateDir = "/var/lib/where-lassul-us";
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+
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leaflet = pkgs.fetchzip {
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url = "https://registry.npmjs.org/leaflet/-/leaflet-1.9.4.tgz";
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hash = "sha256-zzU1O3AxsGn+r3/iL7GJr+LAjLozP0NaJ5DXnZvpllI=";
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};
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webroot = pkgs.runCommand "${domain}-webroot" { } ''
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mkdir -p $out/leaflet
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cp ${./index.html} $out/index.html
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cp ${leaflet}/dist/leaflet.js ${leaflet}/dist/leaflet.css $out/leaflet/
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cp -r ${leaflet}/dist/images $out/leaflet/images
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'';
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# Pull the last 24h of ${entity} from the hass history API and boil it down
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# to [{t, lat, lon, acc}] for the page. hass returns every state write
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# (~1000/day), so consecutive identical coordinates are collapsed.
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fetch = pkgs.writeShellApplication {
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name = "where-lassul-us-fetch";
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runtimeInputs = [
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pkgs.curl
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pkgs.jq
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pkgs.coreutils
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];
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text = ''
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since=$(date -u -d '24 hours ago' +%Y-%m-%dT%H:%M:%SZ)
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curl -fsS \
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-H "Authorization: Bearer $(cat "$CREDENTIALS_DIRECTORY/token")" \
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"${hass}/api/history/period/$since?filter_entity_id=${entity}&significant_changes_only=0" \
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| jq -c '
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.[0]
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| map(select(.attributes.latitude != null))
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| map({
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t: .last_updated,
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lat: .attributes.latitude,
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lon: .attributes.longitude,
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acc: .attributes.gps_accuracy,
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state: .state
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})
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| reduce .[] as $p ([];
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if length > 0 and .[-1].lat == $p.lat and .[-1].lon == $p.lon
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then .[:-1] + [$p]
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else . + [$p]
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end)
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| { updated: (now | todate), points: . }
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' > "${stateDir}/location.json.tmp"
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mv "${stateDir}/location.json.tmp" "${stateDir}/location.json"
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'';
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};
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in
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{
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imports = [ ../default.nix ];
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+
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clan.core.vars.generators.where-lassul-us = {
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files.token = { };
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prompts.token = {
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description = ''
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home-assistant long-lived access token (profile -> security ->
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long-lived access tokens) with read access to ${entity}.
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'';
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type = "hidden";
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persist = true;
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};
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script = ''
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tr -d '\n' < "$prompts/token" > "$out/token"
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'';
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};
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# Static user rather than DynamicUser: the latter hides StateDirectory under
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# /var/lib/private (0700), which nginx cannot traverse.
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users.users.where-lassul-us = {
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isSystemUser = true;
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group = "where-lassul-us";
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};
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users.groups.where-lassul-us = { };
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+
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systemd.services.where-lassul-us-fetch = {
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description = "fetch ${entity} trail from home-assistant for ${domain}";
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after = [ "network-online.target" ];
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wants = [ "network-online.target" ];
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startAt = "*:0/2";
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serviceConfig = {
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Type = "oneshot";
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User = "where-lassul-us";
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Group = "where-lassul-us";
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StateDirectory = "where-lassul-us";
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StateDirectoryMode = "0755";
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UMask = "0022";
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LoadCredential = [ "token:${config.clan.core.vars.generators.where-lassul-us.files.token.path}" ];
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ExecStart = "${fetch}/bin/where-lassul-us-fetch";
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};
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};
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services.nginx.virtualHosts.${domain} = {
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enableACME = true;
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forceSSL = true;
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root = webroot;
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locations."= /location.json".extraConfig = ''
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alias ${stateDir}/location.json;
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default_type application/json;
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add_header Cache-Control "no-cache";
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'';
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};
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}
+149
2configs/websites/where.is.lassul.us/index.html
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2configs/websites/where.is.lassul.us/index.html
···
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<!doctype html>
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<html lang="en">
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<head>
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<meta charset="utf-8" />
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<meta name="viewport" content="width=device-width, initial-scale=1" />
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<title>where is lassulus?</title>
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<link rel="stylesheet" href="/leaflet/leaflet.css" />
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<style>
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html,
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body {
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margin: 0;
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height: 100%;
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background: #111;
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}
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#map {
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position: absolute;
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inset: 0;
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}
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#info {
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position: absolute;
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z-index: 1000;
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left: 0;
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right: 0;
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bottom: 0;
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padding: 0.5em 1em;
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font: 14px/1.4 monospace;
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color: #eee;
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background: rgba(0, 0, 0, 0.7);
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}
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#info a {
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color: #9cf;
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}
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</style>
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</head>
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<body>
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<div id="map"></div>
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<div id="info">loading…</div>
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<script src="/leaflet/leaflet.js"></script>
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<script>
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(function () {
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var map = L.map("map", { zoomControl: true });
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L.tileLayer("https://tile.openstreetmap.org/{z}/{x}/{y}.png", {
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maxZoom: 19,
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attribution:
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'© <a href="https://www.openstreetmap.org/copyright">OpenStreetMap</a> contributors',
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}).addTo(map);
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var layer = L.layerGroup().addTo(map);
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var info = document.getElementById("info");
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+
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function ago(iso) {
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var s = Math.round((Date.now() - Date.parse(iso)) / 1000);
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if (s < 60) return s + "s";
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if (s < 3600) return Math.round(s / 60) + "min";
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if (s < 86400) return (s / 3600).toFixed(1) + "h";
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return (s / 86400).toFixed(1) + "d";
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}
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// trail fades from transparent (24h ago) to solid (now); one segment per point pair
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function render(data) {
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layer.clearLayers();
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var pts = data.points;
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if (!pts.length) {
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info.textContent = "no location in the last 24h";
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return;
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}
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var t0 = Date.parse(pts[0].t),
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t1 = Date.parse(pts[pts.length - 1].t) || t0 + 1;
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for (var i = 1; i < pts.length; i++) {
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var a = pts[i - 1],
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b = pts[i];
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var age = (Date.parse(b.t) - t0) / (t1 - t0);
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L.polyline(
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[
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[a.lat, a.lon],
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[b.lat, b.lon],
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],
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{
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color: "#e33",
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weight: 4,
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opacity: 0.15 + 0.85 * age,
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},
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).addTo(layer);
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}
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var last = pts[pts.length - 1];
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if (last.acc) {
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L.circle([last.lat, last.lon], {
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radius: last.acc,
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color: "#39f",
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weight: 1,
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fillOpacity: 0.1,
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}).addTo(layer);
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}
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L.marker([last.lat, last.lon])
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.addTo(layer)
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.bindPopup(
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"last seen " +
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ago(last.t) +
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" ago<br>" +
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new Date(last.t).toLocaleString(),
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);
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info.innerHTML =
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"<b>lassulus</b> is <b>" +
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last.state +
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"</b> · last seen " +
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ago(last.t) +
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" ago" +
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" · " +
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pts.length +
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" points in the last 24h" +
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' · <a href="https://www.openstreetmap.org/?mlat=' +
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last.lat +
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"&mlon=" +
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last.lon +
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"#map=16/" +
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last.lat +
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"/" +
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last.lon +
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'">osm</a>';
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return L.latLngBounds(
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pts.map(function (p) {
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return [p.lat, p.lon];
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}),
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);
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}
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+
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var first = true;
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function refresh() {
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fetch("/location.json", { cache: "no-cache" })
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.then(function (r) {
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return r.json();
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})
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.then(function (data) {
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var bounds = render(data);
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if (first && bounds) {
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map.fitBounds(bounds.pad(0.1), { maxZoom: 16 });
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first = false;
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}
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})
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.catch(function (e) {
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info.textContent = "failed to load location: " + e;
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});
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}
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refresh();
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setInterval(refresh, 60 * 1000);
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})();
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</script>
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</body>
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</html>