105 lines
3.2 KiB
JavaScript
105 lines
3.2 KiB
JavaScript
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/*
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sitestat.js is meant to be included in the <head> like so:
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<script src="path/to/sitestat.js" async></script>
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See test-site/index.html for an example.
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*/
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/**
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* The global websocket singleton. It's initialized at the bottom of this script.
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* @type {WebSocket | null}
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*/
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let WS = null;
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let REMOTE_URL = null;
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const RETRY_TIMEOUT = 1000;
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let RETRY_COUNT = 0;
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/**
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* Sends some JSON object to sitestat.
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* @param {object} data The data to send.
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*/
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function sendStat(data) {
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if (WS !== null && WS.readyState === WebSocket.OPEN) {
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WS.send(JSON.stringify(data));
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} else {
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console.warn("Couldn't send sitestat data because websocket is not open: ", data);
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}
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}
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/**
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* Handles any event encountered, and sends a small message to sitestat about it.
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* @param {Event} event The event that occurred.
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*/
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function handleEvent(event) {
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sendStat({
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type: "event",
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event: event.type
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});
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}
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/**
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* Gets the remote URL that sitestat is running at, from the query params of
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* the script's `src` attribute. Throws an error if such a URL could not be
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* found.
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* @returns {string} The remote URL to connect to.
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*/
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function getRemoteUrl() {
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const scriptUrl = document.currentScript.src;
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const paramsIdx = scriptUrl.indexOf("?");
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if (paramsIdx !== -1) {
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const paramsStr = scriptUrl.substring(paramsIdx);
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const params = new URLSearchParams(paramsStr);
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const remoteUrl = params.get("remote-url");
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if (remoteUrl !== null) {
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return remoteUrl;
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}
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}
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throw new Error("Missing `remote-url=...` query parameter on script src attribute.")
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}
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function initWS() {
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console.info("Trying to open a connection to sitestat...");
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WS = new WebSocket(`wss://${REMOTE_URL}/ws`);
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WS.onopen = () => {
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console.info(
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"📈 Established a connection to %csitestat%c for %cnon-intrusive, non-identifiable%csite analytics.\nLearn more here: https://github.com/andrewlalis/sitestat or check your browser's network tab to see what's being sent.",
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"font-weight: bold; font-style: italic; font-size: large; color: #32a852; background-color: #2e2e2e; padding: 5px;",
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"",
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"font-style: italic;"
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);
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sendStat({
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type: "ident",
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href: window.location.href,
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userAgent: window.navigator.userAgent,
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viewport: {
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width: window.innerWidth,
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height: window.innerHeight
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}
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});
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}
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// WS.onerror = console.error;
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WS.onclose = (closeEvent) => {
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if (closeEvent.code > 1001 && RETRY_COUNT < 10) {
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RETRY_COUNT++;
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console.warn("sitestat connection closed unexpectedly with code "+closeEvent.code+". Trying to reestablish the connection in " + RETRY_TIMEOUT + "ms.");
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window.setTimeout(initWS, RETRY_TIMEOUT);
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}
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}
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}
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// The main script starts below:
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if (window.navigator.webdriver) {
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throw new Error("sitestat disabled for automated user agents.");
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}
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REMOTE_URL = getRemoteUrl();
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initWS();
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// Register various event listeners.
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const events = ["click", "keyup", "keydown", "copy"];
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for (let i = 0; i < events.length; i++) {
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document.addEventListener(events[i], handleEvent);
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}
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