1a05876c1b
Also do minor changes: - Add utility functions to hide and show the first element matching a CSS class; - Add SameSite property with Strict value to the temporary cookie used to detect cookies availability on the client.
126 lines
4.5 KiB
JavaScript
126 lines
4.5 KiB
JavaScript
// Common functions
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// These functions should be executed in all the game pages, except the privacy policy, licenses, and legal mentions ones.
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/*
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* Prevent using Internet Explorer browser in the game, by detecting whether MSIE or Trident is
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* present in the user agent.
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*
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* <p>
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* If Internet Explorer is used, an error message which prevents playing the game and requesting
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* user to change their browser is shown.
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* </p>
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*/
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function detectIEBrowsers() {
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const browserName = window.navigator.userAgent;
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if (browserName.indexOf("MSIE") != -1 || browserName.indexOf("Trident") != -1) {
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showUnsupportedBrowserMessage("Il semblerait que vous utilisez Internet Explorer, un navigateur non supporté. Veuillez utiliser un autre navigateur récent tel que Firefox.");
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}
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}
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/**
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* Check the availability of the WebSocket API in the client.
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*
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* <p>
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* If it is not available, an error message which prevents playing the game and requesting user to
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* enable WebSocket API is shown.
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* </p>
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*/
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function checkWebSocketAvailability() {
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if (!window.WebSocket) {
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showUnsupportedBrowserMessage("Votre navigateur ne prend pas en charge les API WebSocket, nécessaires au fonctionnement du jeu. Veuillez les activer ou utiliser un navigateur compatible avec ces APIs, tel que Firefox.");
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}
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}
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/**
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* Create a temporary cookie to detect whether cookies are allowed for the game website domain.
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*
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* <p>
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* This cookie, cookietest, with 1 as a value, is automatically deleted after being created.
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* </p>
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*
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* @returns whether cookies are allowed for the website domain
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*/
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function createTemporaryCookieThenDeleteIt() {
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try {
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// Create a temporary cookie
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document.cookie = "cookietest=1; SameSite=Strict; Path=/";
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const cookieTestResult = document.cookie.indexOf("cookietest=") !== -1;
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// Delete the temporary cookie
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document.cookie = "cookietest=1; SameSite=Strict; Expires=Thu, 01-Jan-1970 00:00:01 GMT; Path=/";
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return cookieTestResult;
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} catch (e) {
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return false;
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}
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}
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/**
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* Check the availability of cookies in the client.
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*
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* <p>
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* If it is not available, an error message which prevents playing the game and requesting user to
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* enable website cookies is shown.
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* </p>
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*/
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function checkCookiesAvailability() {
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if (!createTemporaryCookieThenDeleteIt()) {
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showUnsupportedBrowserMessage("Votre navigateur ne prend pas en charge les cookies, nécessaires au fonctionnement du jeu. Veuillez les activer dans les paramètres de votre navigateur.");
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}
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}
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/**
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* Show the unsupported browser dialog, which disables ability to play the game, using the given
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* unsupported browser message text.
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*
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* <p>
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* This method will provide the text supplied to the first element with the unsupported_browser_msg
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* CSS class found.
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* </p>
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*
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* @param {String} messageText the error message to show, as a string and not as an HTML block
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*/
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function showUnsupportedBrowserMessage(messageText) {
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showAlertDialog(document.getElementById("unsupported_browser_dialog"));
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const unsupportedBrowserMessageElement = document.querySelector(".unsupported_browser_msg");
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unsupportedBrowserMessageElement.textContent = messageText;
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unsupportedBrowserMessageElement.classList.add("unsupported_show");
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}
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/**
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* Show an alert dialog component which will show a background preventing interactions with the game.
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*
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* <p>
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* This function will add the alert_dialog_show CSS class to the element passed and show to the first
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* element found with the alert_dialog_background class.
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* </p>
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*
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* @param {Element} element an HTML element which should contain the alert_dialog CSS class
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*/
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function showAlertDialog(element) {
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element.classList.add("alert_dialog_show");
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document.querySelector(".alert_dialog_background").style.display = "block";
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}
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/**
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* Show the first element with the given CSS class, by removing the hidden CSS class on it.
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*
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* @param {String} className the CSS class on which showing the first element found
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*/
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function showFirstClassElement(className) {
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document.querySelector("." + className).classList.remove("hidden");
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}
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/**
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* Hide the first element with the given CSS class, by adding the hidden CSS class on it.
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*
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* @param {String} className the CSS class on which hiding the first element found
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*/
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function hideFirstClassElement(className) {
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document.querySelector("." + className).classList.add("hidden");
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}
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// Execution of main functions
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detectIEBrowsers();
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checkWebSocketAvailability();
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checkCookiesAvailability();
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