506 lines
20 KiB
JavaScript
506 lines
20 KiB
JavaScript
/* TODO:
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* built-in logging
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* relative URL root for redirects and internal functions? (or useless since HTML must be custom anyways?)
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* utility functions for rewriting url query parameters?
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* fix hash navigation to prevent no-going-back issue (possible?)
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* finish polishing the cookie API
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* implement some nodejs `fs` functions for client-side
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* other things listed in the file
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*/
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(() => {
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const envIsNode = (typeof module === 'object' && typeof module.exports === 'object');
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const envIsBrowser = (typeof window !== 'undefined' && typeof window.document !== 'undefined');
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const allOpts = {};
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let fs, path, mime, multipart;
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// 2 years is a good default duration for a system cookie
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// they say Firefox limits to that; Chromium forces expiry after 400 days
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// (https://http.dev/set-cookie#max-age)
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const cookieMaxAge2Years = (2 * 365 * 24 * 60 * 60);
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const setup = (globalOptions={}) => {
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allOpts.global = globalOptions;
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//allOpts.global.appName ||= 'Untitled SpaccDotWeb App';
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//allOpts.global.appRoot ||= ''; //TODO
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allOpts.global.staticPrefix ||= '/static/';
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//allOpts.global.staticRoot ||= ''; //TODO
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allOpts.global.staticFiles ||= [];
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allOpts.global.linkStyles ||= [];
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//allOpts.global.linkRuntimeScripts ||= []; //TODO
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allOpts.global.linkClientScripts ||= [];
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for (const item of [ ...allOpts.global.linkStyles, ...allOpts.global.linkClientScripts ]) {
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const itemLow = item.toLowerCase();
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if (!(itemLow.startsWith('http://') || itemLow.startsWith('https://') || itemLow.startsWith('/'))) {
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allOpts.global.staticFiles.push(item);
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}
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}
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allOpts.global.pageTitler ||= (title, opts={}) => `${title || ''}${title && allOpts.global.appName ? ' — ' : ''}${allOpts.global.appName || ''}`,
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allOpts.global.appPager ||= (content, title, opts={}) => content,
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allOpts.global.htmlPager ||= (content, title, opts={}) => `<!DOCTYPE html><html><head><!--
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--><meta charset="utf-8"/><!--
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--><meta name="viewport" content="width=device-width, initial-scale=1.0"/><!--
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--><title>${(opts.pageTitler || allOpts.global.pageTitler)(title, opts)}</title><!--
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-->${allOpts.global.linkStyles.map((path) => makeHtmlStyleFragment(path, opts.selfContained)).join('')}<!--
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-->${allOpts.global.linkClientScripts.map((path) => makeHtmlScriptFragment(path, opts.selfContained)).join('')}<!--
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--></head><body><!--
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--><div id="transition"></div><!--
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--><div id="app">${(opts.appPager || allOpts.global.appPager)(content, title, opts)}</div><!--
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--></body></html>`;
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const result = {};
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result.initServer = (serverOptions={}) => initServer(serverOptions);
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if (envIsNode) {
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result.writeStaticHtml = writeStaticHtml;
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}
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return result;
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};
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const initServer = (serverOptions) => {
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allOpts.server = serverOptions;
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allOpts.server.defaultResponse ||= { code: 500, headers: {} };
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allOpts.server.endpointsFalltrough ||= false;
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allOpts.server.metaCookie ||= 'spaccdotweb-meta';
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if (envIsNode) {
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allOpts.server.port ||= 3000;
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allOpts.server.address ||= '127.0.0.1';
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allOpts.server.maxBodyUploadSize = (parseInt(allOpts.server.maxBodyUploadSize) || undefined);
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allOpts.server.handleHttpHead ||= true;
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require('http').createServer(handleRequest).listen(allOpts.server.port, allOpts.server.address);
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}
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if (envIsBrowser) {
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allOpts.server.appElement ||= 'div#app';
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allOpts.server.transitionElement ||= 'div#transition';
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const navigatePage = () => handleRequest({ url: window.location.hash.slice(1), method: 'GET' });
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window.addEventListener('hashchange', () => {
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window.location.hash ||= '/';
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navigatePage();
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});
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navigatePage();
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}
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return allOpts.server;
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};
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const writeStaticHtml = (selfContained=false) => {
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// TODO fix selfContained to embed everything when true, even the runtime files
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// TODO: this should somehow set envIsBrowser to true to maybe allow for correct template rendering, but how to do it without causing race conditions? maybe we should expose another variable
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const appFilePath = process.mainModule.filename;
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const htmlFilePath = (appFilePath.split('.').slice(0, -1).join('.') + '.html');
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// path.relative seems to always append an extra '../', so we must slice it
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const libraryPath = path.relative(appFilePath, __filename).split(path.sep).slice(1).join(path.sep);
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const libraryFolder = libraryPath.split(path.sep).slice(0, -1).join(path.sep);
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fs.writeFileSync(htmlFilePath, allOpts.global.htmlPager(`
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${makeHtmlScriptFragment(libraryPath, selfContained)}
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${makeHtmlScriptFragment(((libraryFolder && (libraryFolder + '/')) + 'SpaccDotWeb.Alt.js'), selfContained)}
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<${'script'}>
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window.require = () => {
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window.require = async (src, type) => {
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await SpaccDotWeb.RequireScript((src.startsWith('./') ? src : ('node_modules/' + src)), type);
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};
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return window.SpaccDotWebServer;
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};
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window.SpaccDotWebServer.staticFilesData = { ${selfContained ? allOpts.global.staticFiles.map((file) => {
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// TODO check if these paths are correct or must still be fixed
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const filePath = (appFilePath.split(path.sep).slice(0, -1).join(path.sep) + path.sep + file);
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return `"${file}":"data:${mime.lookup(filePath)};base64,${fs.readFileSync(filePath).toString('base64')}"`;
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}).join() : ''} };
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</${'script'}>
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${makeHtmlScriptFragment(path.basename(appFilePath), selfContained)}
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`, null, { selfContained }));
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return htmlFilePath;
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};
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const makeHtmlStyleFragment = (path, getContent) => {
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const data = getFilePathContent(path, getContent);
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return (data[1] ? `<style>${data[1]}</style>` : `<link rel="stylesheet" href="${data[0]}"/>`);
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};
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const makeHtmlScriptFragment = (path, getContent) => {
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const data = getFilePathContent(path, getContent);
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return `<${'script'}${data[1] ? `>${data[1]}` : ` src="${data[0]}">`}</${'script'}>`;
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};
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const getFilePathContent = (path, getContent) => ([
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(allOpts.global.staticFiles.includes(path) ? (allOpts.global.staticPrefix + path) : ('./' + path)),
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(getContent && fs.existsSync(path) && fs.readFileSync(path)),
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]);
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const handleRequest = async (request, response={}) => {
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// build request context and handle special tasks
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let result = allOpts.server.defaultResponse;
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const context = {
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request,
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response,
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cookieString: (envIsNode ? (request.headers.cookie || '') : envIsBrowser ? clientCookieApi() : ''),
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clientLanguages: parseclientLanguages(request),
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urlPath: request.url.slice(1).toLowerCase().split('?')[0],
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urlQuery: request.url.split('?')?.slice(1)?.join('?'),
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bodyParameters: (['POST', 'PUT', 'PATCH'].includes(request.method) && await parseBodyParams(request)), // TODO which other methods need body?
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//storageApi: (key,value, opts) => storageApi(key, value, opts),
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redirectTo: (url) => redirectTo(response, url),
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};
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context.renderPage = (content, title, opts) => renderPage(response, content, title, { ...opts, context });
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context.urlSections = context.urlPath.split('/');
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context.urlParameters = Object.fromEntries(new URLSearchParams(context.urlQuery));
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context.cookieData = parseCookieString(context.cookieString);
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context.getCookie = (cookieName) => (cookieName ? context.cookieData[cookieName]?.value : context.cookieString);
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context.setCookie = (cookie, cookieValue, cookieFlags) => (context.cookieString = setCookie(context.cookieData, response, cookie, cookieValue, cookieFlags));
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if (allOpts.server.metaCookie) {
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context.renewCookie = (cookieName) => renewCookie(context.getCookie, context.setCookie, cookieName);
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}
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setClientTransition(true);
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const handlingHttpHead = (allOpts.server.handleHttpHead && request.method === 'HEAD')
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if (handlingHttpHead) {
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request.method = 'GET';
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}
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// serve static files
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if (envIsNode && request.method === 'GET' && request.url.toLowerCase().startsWith(allOpts.global.staticPrefix)) {
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const resPath = request.url.split(allOpts.global.staticPrefix).slice(1).join(allOpts.global.staticPrefix);
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const filePath = (process.mainModule.path + path.sep + resPath); // TODO i think we need to read this another way if the module is in a different directory from the importing program
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if (allOpts.global.staticFiles.includes(resPath) && fs.existsSync(filePath)) {
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result = { code: 200, headers: { 'content-type': mime.lookup(filePath) }, body: fs.readFileSync(filePath) };
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} else {
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result = { code: 404 };
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}
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} else {
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// handle custom endpoints
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for (const [check, procedure] of allOpts.server.endpoints) {
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if (await requestCheckFunction(check, context)) {
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result = await procedure(context);
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if (!allOpts.server.endpointsFalltrough) {
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break;
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}
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}
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}
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}
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// finalize a normal response
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if (result) {
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response.statusCode = result.code;
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for (const name in result.headers) {
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response.setHeader(name, result.headers[name]);
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}
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response.end(!handlingHttpHead && result.body);
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}
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};
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const requestCheckFunction = (check, context) => {
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if (typeof check == 'function') {
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return check(context);
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} else if (typeof check == 'string') {
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let [method, ...urlSections] = check.trim().split(' ');
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urlSections = urlSections.join(' ').trim().split('/').slice(1, -1);
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const methodCheck = (method === '*' || method.split('|').includes(context.request.method));
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let urlCheck = true;
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for (const sectionIndex in urlSections) {
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const urlSection = urlSections[sectionIndex];
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const checkSection = context.urlSections[sectionIndex];
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if (!['', '*', checkSection].includes(urlSection)) {
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urlCheck = false;
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break;
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}
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}
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return (methodCheck && urlCheck);
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}
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};
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const renderPage = (response, content, title, opts={}) => {
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// TODO titles and things
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// TODO status code could need to be different in different situations and so should be set accordingly? (but we don't handle it here?)
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if (envIsNode) {
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response.setHeader('content-type', 'text/html; charset=utf-8');
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response.end((opts.htmlPager || allOpts.global.htmlPager)(content, title, opts));
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}
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if (envIsBrowser) {
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document.title = (opts.pageTitler || allOpts.global.pageTitler)(title, opts);
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document.querySelector(allOpts.server.appElement).innerHTML = ((opts.appPager || allOpts.global.appPager)(content, title, opts));
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for (const srcElem of document.querySelectorAll(`[src^="${allOpts.global.staticPrefix}"]`)) {
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var fileUrl = makeStaticClientFileUrl(srcElem.getAttribute('src'));
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if (srcElem.tagName === 'SCRIPT') {
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// script elements die immediately after being first set up,
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// so we must re-create them to have them run with correct uri
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srcElem.remove();
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document.head.appendChild(Object.assign(document.createElement('script'), { src: fileUrl }));
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} else {
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srcElem.src = fileUrl;
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}
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}
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for (const linkElem of document.querySelectorAll(`link[rel="stylesheet"][href^="${allOpts.global.staticPrefix}"]`)) {
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linkElem.href = makeStaticClientFileUrl(linkElem.getAttribute('href'));
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}
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for (const aElem of document.querySelectorAll('a[href^="/"]')) {
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aElem.href = `#${aElem.getAttribute('href')}`;
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}
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for (const formElem of document.querySelectorAll('form')) {
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formElem.onsubmit = (event) => {
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event.preventDefault();
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const formData = (new FormData(formElem));
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formData.append(event.submitter.getAttribute('name'), (event.submitter.value || 'Submit'));
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handleRequest({
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method: (formElem.getAttribute('method') || 'GET'),
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url: (formElem.getAttribute('action') || location.hash.slice(1)),
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headers: { 'content-type': (formElem.getAttribute('enctype') || "application/x-www-form-urlencoded") },
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body: formData,
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});
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};
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}
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setClientTransition(false);
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};
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};
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const makeStaticClientFileUrl = (url) => {
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url = url.slice(allOpts.global.staticPrefix.length);
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return (window.SpaccDotWebServer.staticFilesData[url] || ('./' + url));
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};
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const setClientTransition = (status) => {
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let transitionElement;
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if (envIsBrowser && (transitionElement = document.querySelector(allOpts.server.transitionElement))) {
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transitionElement.hidden = !status;
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transitionElement.style.display = (status ? 'block' : 'none');
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}
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}
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const redirectTo = (response, url) => {
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if (envIsNode) {
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response.statusCode = 302;
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response.setHeader('location', url);
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response.end();
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}
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if (envIsBrowser) {
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location.hash = url;
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}
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};
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const parseBodyParams = async (request) => {
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try {
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let params = {};
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if (envIsNode) {
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request.body = Buffer.alloc(0);
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request.on('data', (data) => {
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request.body = Buffer.concat([request.body, data]);
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if (request.body.length > allOpts.server.maxBodyUploadSize) {
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request.connection?.destroy();
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// TODO handle this more gracefully? maybe an error callback or something?
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}
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});
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await new Promise((resolve) => request.on('end', () => resolve()));
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}
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const [contentMime, contentEnc] = request.headers['content-type'].split(';');
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if (envIsNode && contentMime === 'application/x-www-form-urlencoded') {
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for (const [key, value] of (new URLSearchParams(request.body.toString())).entries()) {
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if (key in params) {
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params[key] = [].concat(params[key], value);
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} else {
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params[key] = value;
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}
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}
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} else if (envIsNode && contentMime === 'multipart/form-data') {
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for (const param of multipart.parse(request.body, contentEnc.split('boundary=')[1])) {
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params[param.name] = (param.type && param.filename !== undefined ? param : param.data.toString());
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}
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} else if (envIsBrowser && ['application/x-www-form-urlencoded', 'multipart/form-data'].includes(contentMime)) {
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for (const [key, value] of request.body) {
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params[key] = value;
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params[key].filename = params[key].name;
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}
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}
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return params;
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} catch (err) {
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console.log(err);
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request.connection?.destroy();
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}
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};
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const makeCookieString = (cookieData) => {
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let cookieString = '';
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for (const cookieName in cookieData) {
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cookieString += `; ${cookieName}=${cookieData[cookieName].value}`;
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}
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return cookieString.slice(2);
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}
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const parseCookieString = (cookieString) => {
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const cookieData = {};
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if (!cookieString) {
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return cookieData;
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}
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for (const cookie of cookieString.split('; ')) {
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const [key, ...rest] = cookie.split('=');
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cookieData[key] = { value: rest.join('=') };
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}
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if (allOpts.server.metaCookie) {
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const metaData = parseMetaCookie(cookieData[allOpts.server.metaCookie]?.value);
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for (const cookieName in cookieData) {
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cookieData[cookieName] = { ...cookieData[cookieName], ...metaData[cookieName] };
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}
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}
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return cookieData;
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};
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const setCookie = (cookieData, response, cookie, cookieValue, cookieFlags) => {
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const cookieSet = [];
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const setCookie = (cookie, cookieValue, cookieFlags) => {
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// TODO implement setCookie with standard raw format (current) and optional javascript object format
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let cookieString, cookieName;
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if (cookieValue === undefined) {
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cookieString = cookie;
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[cookieName, ...cookieValue] = cookieString.split('; ')[0].split('=');
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cookieValue = cookieValue.join('=');
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} else {
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cookieName = cookie;
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}
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// Expires is deprecated, but old browsers don't support Max-Age
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// (https://mrcoles.com/blog/cookies-max-age-vs-expires)
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// so, we set Expires when it is missing but Max-Age is present
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let expires = false;
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let maxAge;
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for (let flag of cookieString.split('; ').slice(1)) {
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flag = flag.toLowerCase();
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if (!expires && flag.startsWith('max-age=')) {
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maxAge = flag.split('=')[1];
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} else if (flag.startsWith('expires=')) {
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expires = true;
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}
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}
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if (!expires && maxAge) {
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cookieString += `; expires=${(new Date(Date.now() + (maxAge * 1000))).toUTCString()}`;
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}
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if (envIsNode) {
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cookieSet.push(cookieString);
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} else if (envIsBrowser) {
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clientCookieApi(cookieString);
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}
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// TODO update cookie flags inside cookieData, this just updates the value
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// because of this (?) also the value of the metaCookie is not updated in the request
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cookieData[cookieName] ||= {};
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cookieData[cookieName].value = cookieValue;
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cookieString = makeCookieString(cookieData);
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return cookieString;
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};
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const result = setCookie(cookie, cookieValue, cookieFlags);
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if (allOpts.server.metaCookie) {
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const [cookieBody, ...cookieFlags] = cookie.split('; ');
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const cookieName = cookieBody.split('=')[0];
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const metaData = parseMetaCookie(cookieData[allOpts.server.metaCookie]?.value);
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if (cookieFlags.length) {
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metaData[cookieName] = parseMetaCookie(`${cookieName}&${cookieFlags.join('&')}`)[cookieName];
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} else {
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delete metaData[cookieName];
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}
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setCookie(`${allOpts.server.metaCookie}=${makeMetaCookie(metaData)}; max-age=${cookieMaxAge2Years}`);
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}
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if (envIsNode) {
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response.setHeader('set-cookie', cookieSet);
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}
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return result;
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};
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// TODO handle renewal of all cookies at the same time if no name specified?
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const renewCookie = (getCookie, setCookie, cookieName) => {
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const metaData = parseMetaCookie(getCookie(allOpts.server.metaCookie));
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const cookieFlags = makeMetaCookie({ [cookieName]: metaData[cookieName] }).split('|')[0].slice(cookieName.length).replaceAll('&', '; ');
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setCookie(`${cookieName}=${getCookie(cookieName)}${cookieFlags}`);
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setCookie(`${allOpts.server.metaCookie}=${makeMetaCookie(metaData)}; max-age=${cookieMaxAge2Years}`);
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};
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// below we use pipe ('|') to split cookies and amperstand ('&') for fields,
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// no problem since as of 2024 no standard cookie flag has that in the body
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const makeMetaCookie = (metaData) => {
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let metaString = '';
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metaData[allOpts.server.metaCookie] ||= {};
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metaData[allOpts.server.metaCookie]['set-date'] = (new Date()).toUTCString();
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for (const [name, flags] of Object.entries(metaData)) {
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metaString += `|${name}&`;
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for (const [key, value] of Object.entries(flags)) {
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// by standard, boolean cookie flags are named without any value if true, omitted if false
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metaString += (value === true ? `${key}&` : `${key}=${value}&`);
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|
}
|
|
metaString = metaString.slice(0, -1);
|
|
}
|
|
return metaString.slice(1);
|
|
};
|
|
|
|
const parseMetaCookie = (metaString) => {
|
|
const metaCookie = {};
|
|
if (!metaString) {
|
|
return metaCookie;
|
|
}
|
|
for (const cookie of metaString.split('|')) {
|
|
const [name, ...fields] = cookie.split('&');
|
|
metaCookie[name] = {};
|
|
for (const field of fields) {
|
|
if (!field) {
|
|
continue;
|
|
}
|
|
const [key, ...tokens] = field.split('=');
|
|
metaCookie[name][key] = (tokens.join('=') || true);
|
|
}
|
|
}
|
|
return metaCookie;
|
|
};
|
|
|
|
// try to use the built-in cookie API, fallback to a Storage-based wrapper in case it fails (for example on file:///)
|
|
const clientCookieApi = (envIsBrowser && (document.cookie || (!document.cookie && (document.cookie = '_=_') && document.cookie)
|
|
? (set) => (set ? (document.cookie = set) : document.cookie)
|
|
: (set) => {
|
|
const gid = allOpts.global.appName; // TODO: introduce a conf field that is specifically a GID for less potential problems?
|
|
// also, TODO: what to do when no app name or any id is set?
|
|
if (set) {
|
|
let api = sessionStorage;
|
|
const tokens = set.split(';');
|
|
let [key, ...rest] = tokens[0].split('=');
|
|
for (let token of tokens) {
|
|
token = token.trim();
|
|
if (['expires', 'max-age'].includes(token.split('=')[0].toLowerCase())) {
|
|
api = localStorage;
|
|
break;
|
|
}
|
|
}
|
|
key = `${gid}/${key}`;
|
|
const value = rest.join('=');
|
|
if (value) {
|
|
api.setItem(key, value);
|
|
} else {
|
|
sessionStorage.removeItem(key);
|
|
localStorage.removeItem(key);
|
|
}
|
|
} else /*(get)*/ {
|
|
let items = '';
|
|
for (const item of Object.entries({ ...localStorage, ...sessionStorage })) {
|
|
if (item[0].startsWith(`${gid}/`)) {
|
|
items += (item.join('=') + ';').slice(gid.length + 1);
|
|
}
|
|
}
|
|
return items.slice(0, -1);
|
|
}
|
|
}));
|
|
|
|
const parseclientLanguages = (request) => {
|
|
if (envIsNode) {
|
|
const languages = [];
|
|
const languageTokens = request.headers['accept-language']?.split(',');
|
|
if (languageTokens) {
|
|
for (const language of languageTokens) {
|
|
languages.push(language.split(';')[0].trim());
|
|
}
|
|
}
|
|
return languages;
|
|
} else if (envIsBrowser) {
|
|
return (navigator.languages || [navigator.language /* || navigator.userLanguage */]);
|
|
}
|
|
};
|
|
|
|
const exportObj = { envIsNode, envIsBrowser, setup, makeHtmlStyleFragment, makeHtmlScriptFragment };
|
|
if (envIsNode) {
|
|
fs = require('fs');
|
|
path = require('path');
|
|
mime = require('mime-types');
|
|
multipart = require('parse-multipart-data');
|
|
module.exports = exportObj;
|
|
}
|
|
if (envIsBrowser) {
|
|
window.SpaccDotWebServer = exportObj;
|
|
}
|
|
|
|
})();
|