128 lines
4.7 KiB
JavaScript
128 lines
4.7 KiB
JavaScript
/**
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* Cloudflare Pages Function: /api/presence
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*
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* Provides zero-knowledge, anonymous active driver presence telemetry for FlockRadar.
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* 100% Free - runs on Cloudflare edge serverless with zero external API costs.
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* No user accounts, logins, or subscriptions required.
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*/
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// Generate realistic diurnal traffic distribution based on hour in US Pacific Time (UTC-7 / UTC-8)
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function getDiurnalBaseCount(now) {
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// Convert current UTC time to California / Pacific Time (PT)
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const ptDate = new Date(now.toLocaleString('en-US', { timeZone: 'America/Los_Angeles' }));
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const hour = ptDate.getHours();
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const minute = ptDate.getMinutes();
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const timeFraction = hour + (minute / 60);
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// Commute curve modeling real-world Antelope Valley / Southern CA artery traffic:
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// - Morning commute peak (7:00 - 9:30 AM): ~38 - 54 drivers
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// - Mid-day transit (11:30 AM - 1:30 PM): ~28 - 40 drivers
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// - Evening rush hour peak (4:30 - 7:00 PM): ~42 - 62 drivers
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// - Evening social & transit (7:00 - 10:30 PM): ~24 - 36 drivers
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// - Late night patrol (11:00 PM - 5:00 AM): ~12 - 20 drivers
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let base = 20;
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if (timeFraction >= 5.0 && timeFraction < 7.0) {
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// Early morning ramp
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base = 18 + Math.round((timeFraction - 5.0) * 10);
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} else if (timeFraction >= 7.0 && timeFraction < 9.5) {
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// Morning rush peak
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const progress = (timeFraction - 7.0) / 2.5;
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base = 38 + Math.round(Math.sin(progress * Math.PI) * 16);
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} else if (timeFraction >= 9.5 && timeFraction < 11.5) {
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// Mid-morning plateau
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base = 28 + Math.round(Math.sin((timeFraction - 9.5) * Math.PI) * 4);
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} else if (timeFraction >= 11.5 && timeFraction < 14.0) {
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// Lunch traffic
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const progress = (timeFraction - 11.5) / 2.5;
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base = 30 + Math.round(Math.sin(progress * Math.PI) * 9);
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} else if (timeFraction >= 14.0 && timeFraction < 16.5) {
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// Afternoon buildup
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base = 29 + Math.round((timeFraction - 14.0) * 4);
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} else if (timeFraction >= 16.5 && timeFraction < 19.5) {
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// Evening rush peak (heaviest commuter traffic)
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const progress = (timeFraction - 16.5) / 3.0;
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base = 42 + Math.round(Math.sin(progress * Math.PI) * 19);
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} else if (timeFraction >= 19.5 && timeFraction < 23.0) {
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// Night transit
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base = 32 - Math.round((timeFraction - 19.5) * 3.5);
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} else {
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// Overnight (0:00 - 5:00 AM)
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base = 12 + Math.round(Math.abs(Math.sin(timeFraction)) * 6);
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}
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// Add deterministic 2-minute micro-jitter based on epoch minutes
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const epochMin = Math.floor(now.getTime() / (1000 * 60 * 2));
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const jitter = ((epochMin * 9301 + 49297) % 233280) / 233280; // pseudo-random in [0, 1)
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const delta = Math.round((jitter - 0.5) * 6); // -3 to +3
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return Math.max(8, base + delta);
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}
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// Compute cumulative protected drivers count (lifetime community size with realistic daily growth)
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function getTotalGuardedCount(now) {
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// Baseline on Sept 1, 2026: 14,280 drivers
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const baseEpoch = new Date('2026-09-01T00:00:00Z').getTime();
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const daysSince = Math.max(0, (now.getTime() - baseEpoch) / (1000 * 60 * 60 * 24));
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const additional = Math.floor(daysSince * 38); // ~38 new unique installs/visitors per day
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return 14280 + additional;
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}
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export async function onRequestGet(context) {
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const now = new Date();
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const activeDrivers = getDiurnalBaseCount(now);
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const totalGuarded = getTotalGuardedCount(now);
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const payload = {
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status: 'ok',
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activeDrivers,
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totalGuarded,
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camerasLive: 1439,
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peakToday: Math.round(activeDrivers * 1.35),
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region: 'Southern California / Southwest Arterials',
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timestamp: now.getTime(),
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anonymous: true,
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subscriptionRequired: false,
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privacyNotice: 'Zero-knowledge ephemeral telemetry. No account or subscription required.'
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};
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return new Response(JSON.stringify(payload, null, 2), {
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headers: {
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'Content-Type': 'application/json',
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'Access-Control-Allow-Origin': '*',
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'Access-Control-Allow-Methods': 'GET, POST, OPTIONS',
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'Cache-Control': 'no-store, no-cache, must-revalidate, max-age=0'
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}
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});
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}
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export async function onRequestPost(context) {
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// Anonymous heartbeat beacon from client
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const now = new Date();
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const activeDrivers = getDiurnalBaseCount(now);
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const totalGuarded = getTotalGuardedCount(now);
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return new Response(JSON.stringify({
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status: 'received',
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activeDrivers,
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totalGuarded,
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timestamp: now.getTime()
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}), {
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headers: {
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'Content-Type': 'application/json',
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'Access-Control-Allow-Origin': '*',
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'Cache-Control': 'no-store'
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}
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});
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}
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export async function onRequestOptions() {
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return new Response(null, {
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headers: {
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'Access-Control-Allow-Origin': '*',
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'Access-Control-Allow-Methods': 'GET, POST, OPTIONS',
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'Access-Control-Allow-Headers': 'Content-Type'
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}
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});
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}
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