295 lines
11 KiB
JavaScript
295 lines
11 KiB
JavaScript
/* TODO:
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* built-in logging
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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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const setup = (globalOptions={}) => {
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allOpts.global = globalOptions;
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allOpts.global.staticPrefix ||= '/static/';
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allOpts.global.staticFiles ||= [];
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allOpts.global.linkStyles ||= [];
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allOpts.global.linkScripts ||= [];
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for (const item of [...allOpts.global.linkStyles, ...allOpts.global.linkScripts]) {
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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) => `${title || ''}${title && allOpts.global.appName ? ' — ' : ''}${allOpts.global.appName || ''}`,
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allOpts.global.appPager ||= (content, title) => content,
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allOpts.global.htmlPager ||= (content, title) => `<!DOCTYPE html><html><head><!--
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--><meta charset="utf-8"/><!--
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--><meta name="viewport" content="width=device-width, initial-scale=1.0"/><!--
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--><title>${allOpts.global.pageTitler(title)}</title><!--
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-->${allOpts.global.linkStyles.map((item) => {
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return `<link rel="stylesheet" href="${allOpts.global.staticFiles.includes(item) ? (allOpts.global.staticPrefix + item) : item}"/>`;
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}).join('')}<!--
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--></head><body><!--
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--><div id="transition"></div><!--
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--><div id="app">${allOpts.global.appPager(content, title)}</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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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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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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};
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const writeStaticHtml = () => {
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// TODO: fix script paths
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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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fs.writeFileSync((process.mainModule.filename.split('.').slice(0, -1).join('.') + '.html'), allOpts.global.htmlPager(`
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<script src="./${path.basename(__filename)}"></script>
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<script>
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window.require = () => window.SpaccDotWebServer;
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window.SpaccDotWebServer.resFilesData = { ${allOpts.global.staticFiles.map((file) => {
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const filePath = (process.mainModule.filename.split(path.sep).slice(0, -1).join(path.sep) + path.sep + file);
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return `"${file}": "data:${mime.lookup(filePath)};base64,${fs.readFileSync(filePath).toString('base64')}"`;
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})} };
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</script>
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<script src="./${path.basename(process.mainModule.filename)}"></script>
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`));
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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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urlSections: request.url.slice(1).toLowerCase().split('?')[0].split('/'),
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urlParameters: (new URLSearchParams(request.url.split('?')[1]?.join('?'))),
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bodyParameters: (request.method === 'POST' && await parseBodyParams(request)), // TODO which other methods need body?
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getCookie: (cookie) => getCookie(request, cookie),
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setCookie: (cookie) => setCookie(response, cookie),
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renderPage: (content, title) => renderPage(response, content, title),
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redirectTo: (url) => redirectTo(response, url),
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};
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// client transitions
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if (envIsBrowser && document.querySelector(allOpts.server.transitionElement)) {
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document.querySelector(allOpts.server.transitionElement).style.display = 'block';
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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 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(result.body);
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};
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};
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const renderPage = (response, content, title) => {
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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?
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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(allOpts.global.htmlPager(content, title));
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};
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if (envIsBrowser) {
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document.title = allOpts.global.pageTitler(title);
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document.querySelector(allOpts.server.appElement).innerHTML = allOpts.global.appPager(content, title);
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for (const srcElem of document.querySelectorAll(`[src^="${allOpts.global.staticPrefix}"]`)) {
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srcElem.src = window.SpaccDotWebServer.resFilesData[srcElem.getAttribute('src')];
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};
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for (const linkElem of document.querySelectorAll(`link[rel="stylesheet"][href^="${allOpts.global.staticPrefix}"]`)) {
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linkElem.href = window.SpaccDotWebServer.resFilesData[linkElem.getAttribute('href').slice(allOpts.global.staticPrefix.length)];
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};
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for (const aElem of document.querySelectorAll('a[href^="/"]')) {
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aElem.href = `#${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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if (document.querySelector(allOpts.server.transitionElement)) {
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document.querySelector(allOpts.server.transitionElement).style.display = 'none';
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};
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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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params[key] = value;
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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 getCookie = (request, name) => {
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let cookies;
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if (envIsNode) {
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cookies = (request.headers?.cookie || '');
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};
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if (envIsBrowser) {
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cookies = clientCookieApi();
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};
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if (name) {
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// get a specific cookie
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for (const cookie of (cookies?.split(';') || [])) {
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const [key, ...rest] = cookie.split('=');
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if (key === name) {
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return rest.join('=');
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};
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};
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} else {
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// get all cookies
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return cookies;
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};
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};
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const setCookie = (response, cookie) => {
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if (envIsNode) {
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response.setHeader('Set-Cookie', cookie);
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// TODO update current cookie list in existing request to reflect new assignment
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};
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if (envIsBrowser) {
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clientCookieApi(cookie);
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};
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};
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// try to use the built-in cookie API, fallback to a Storage-based wrapper in case it fails (for example on file:///)
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const clientCookieApi = (envIsBrowser && (document.cookie || (!document.cookie && (document.cookie = '_=_') && document.cookie) ? (set) => (set ? (document.cookie = set) : document.cookie) : (set) => {
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const gid = allOpts.global.appName; // TODO: introduce a conf field that is specifically a GID for less potential problems?
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// also, TODO: what to do when no app name or any id is set?
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if (set) {
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let api = sessionStorage;
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const tokens = set.split(';');
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let [key, ...rest] = tokens[0].split('=');
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for (let token of tokens) {
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token = token.trim();
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if (['expires', 'max-age'].includes(token.split('=')[0].toLowerCase())) {
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api = localStorage;
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break;
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};
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};
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key = `${gid}/${key}`;
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const value = rest.join('=');
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if (value) {
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api.setItem(key, value);
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} else {
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sessionStorage.removeItem(key);
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localStorage.removeItem(key);
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};
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} else /*(get)*/ {
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let items = '';
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for (const item of Object.entries({ ...localStorage, ...sessionStorage })) {
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if (item[0].startsWith(`${gid}/`)) {
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items += (item.join('=') + ';').slice(gid.length + 1);
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};
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}
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return items.slice(0, -1);
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};
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}));
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const exportObj = { envIsNode, envIsBrowser, setup };
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if (envIsNode) {
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fs = require('fs');
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path = require('path');
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mime = require('mime-types');
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multipart = require('parse-multipart-data');
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module.exports = exportObj;
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};
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if (envIsBrowser) {
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window.SpaccDotWebServer = exportObj;
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};
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})();
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