feat: wip visitors stuff

src/lib/visits.ts

@@ -7,17 +7,20 @@ import { get, writable } from "svelte/store";
 const visitCountFile = `${env.WEBSITE_DATA_DIR}/visitcount`
 const visitCount = writable(parseInt(existsSync(visitCountFile) ? readFileSync(visitCountFile).toString() : '0'));
 
+type Visitor = { since: number }
+const lastVisitors = writable<Visitor[]>([]);
+const MAX_VISITORS = 10
+const VISITOR_EXPIRY_SECONDS = 60 * 30 // half an hour is reasonable
+
 export const incrementVisitCount = (request: Request, cookies: Cookies) => {
     let currentVisitCount = get(visitCount)
     // check whether the request is from a bot or not (this doesnt need to be accurate we just want to filter out honest bots)
-    const ua = request.headers.get('user-agent')
+    if (isBot(request)) { return currentVisitCount }
-    const isBot = ua ? ua.toLowerCase().match(/(bot|crawl|spider|walk)/) !== null : true
-    if (!isBot) {
     const scopedCookies = scopeCookies(cookies, '/')
     // parse the last visit timestamp from cookies if it exists
     const visitedTimestamp = parseInt(scopedCookies.get('visitedTimestamp') || "0")
     // get unix timestamp
-        const currentTime = new Date().getTime()
+    const currentTime = Date.now()
     const timeSinceVisit = currentTime - visitedTimestamp
     // check if this is the first time a client is visiting or if an hour has passed since they last visited
     if (visitedTimestamp === 0 || timeSinceVisit > 1000 * 60 * 60 * 24) {
@@ -28,10 +31,37 @@ export const incrementVisitCount = (request: Request, cookies: Cookies) => {
         // write the visit count to a file so we can load it later again
         writeFileSync(visitCountFile, currentVisitCount.toString())
     }
-    }
     return currentVisitCount
 }
 
+export const addLastVisitor = (request: Request, cookies: Cookies) => {
+    const currentTime = Date.now()
+    let visitors = get(lastVisitors).filter(
+        (value) => { return currentTime - value.since > 1000 * VISITOR_EXPIRY_SECONDS }
+    )
+    // check whether the request is from a bot or not (this doesnt need to be accurate we just want to filter out honest bots)
+    if (isBot(request)) { return visitors }
+    const scopedCookies = scopeCookies(cookies, '/')
+    // parse the last visit timestamp from cookies if it exists
+    const visitorTimestamp = parseInt(scopedCookies.get('visitorTimestamp') || "0")
+    // get unix timestamp
+    const timeSinceVisit = currentTime - visitorTimestamp
+    // check if this is the first time a client is visiting or if an hour has passed since they last visited
+    if (visitorTimestamp === 0 || timeSinceVisit > 1000 * VISITOR_EXPIRY_SECONDS) {
+        visitors.push({ since: currentTime })
+        if (visitors.length > MAX_VISITORS) { visitors.shift() }
+        // update the cookie with the current timestamp
+        scopedCookies.set('visitorTimestamp', currentTime.toString())
+    }
+    return visitors
+}
+
+const isBot = (request: Request) => {
+    const ua = request.headers.get('user-agent')
+    return ua ? ua.toLowerCase().match(/(bot|crawl|spider|walk|fetch|scrap|proxy|image)/) !== null : true
+
+}
+
 export const notifyDarkVisitors = (url: URL, request: Request) => {
     fetch('https://api.darkvisitors.com/visits', {
         method: 'POST',