mirror of
https://github.com/kevin-DL/sapper.git
synced 2026-01-14 20:14:39 +00:00
move app logic into templates (#444)
This commit is contained in:
Rich Harris
318
templates/src/server/middleware/get_page_handler.ts
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318
templates/src/server/middleware/get_page_handler.ts
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@@ -0,0 +1,318 @@
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import * as fs from 'fs';
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import * as path from 'path';
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import cookie from 'cookie';
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import devalue from 'devalue';
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import fetch from 'node-fetch';
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import { build_dir, dev, src_dir, IGNORE } from '../placeholders';
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import { Manifest, Page, Props, Req, Res, Store } from './types';
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export function get_page_handler(
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manifest: Manifest,
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store_getter: (req: Req, res: Res) => Store
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) {
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const get_build_info = dev
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? () => JSON.parse(fs.readFileSync(path.join(build_dir, 'build.json'), 'utf-8'))
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: (assets => () => assets)(JSON.parse(fs.readFileSync(path.join(build_dir, 'build.json'), 'utf-8')));
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const template = dev
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? () => read_template(src_dir)
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: (str => () => str)(read_template(build_dir));
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const has_service_worker = fs.existsSync(path.join(build_dir, 'service-worker.js'));
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const { server_routes, pages } = manifest;
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const error_route = manifest.error;
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function handle_error(req: Req, res: Res, statusCode: number, error: Error | string) {
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handle_page({
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pattern: null,
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parts: [
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{ name: null, component: error_route }
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]
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}, req, res, statusCode, error || new Error('Unknown error in preload function'));
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}
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function handle_page(page: Page, req: Req, res: Res, status = 200, error: Error | string = null) {
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const build_info: {
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bundler: 'rollup' | 'webpack',
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shimport: string | null,
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assets: Record<string, string | string[]>,
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legacy_assets?: Record<string, string>
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} = get_build_info();
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res.setHeader('Content-Type', 'text/html');
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res.setHeader('Cache-Control', dev ? 'no-cache' : 'max-age=600');
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// preload main.js and current route
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// TODO detect other stuff we can preload? images, CSS, fonts?
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let preloaded_chunks = Array.isArray(build_info.assets.main) ? build_info.assets.main : [build_info.assets.main];
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if (!error) {
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page.parts.forEach(part => {
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if (!part) return;
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// using concat because it could be a string or an array. thanks webpack!
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preloaded_chunks = preloaded_chunks.concat(build_info.assets[part.name]);
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});
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}
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const link = preloaded_chunks
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.filter(file => file && !file.match(/\.map$/))
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.map(file => `<${req.baseUrl}/client/${file}>;rel="preload";as="script"`)
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.join(', ');
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res.setHeader('Link', link);
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const store = store_getter ? store_getter(req, res) : null;
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let redirect: { statusCode: number, location: string };
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let preload_error: { statusCode: number, message: Error | string };
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const preload_context = {
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redirect: (statusCode: number, location: string) => {
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if (redirect && (redirect.statusCode !== statusCode || redirect.location !== location)) {
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throw new Error(`Conflicting redirects`);
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}
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location = location.replace(/^\//g, ''); // leading slash (only)
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redirect = { statusCode, location };
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},
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error: (statusCode: number, message: Error | string) => {
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preload_error = { statusCode, message };
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},
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fetch: (url: string, opts?: any) => {
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const parsed = new URL(url, `http://127.0.0.1:${process.env.PORT}${req.baseUrl ? req.baseUrl + '/' :''}`);
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if (opts) {
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opts = Object.assign({}, opts);
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const include_cookies = (
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opts.credentials === 'include' ||
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opts.credentials === 'same-origin' && parsed.origin === `http://127.0.0.1:${process.env.PORT}`
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);
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if (include_cookies) {
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if (!opts.headers) opts.headers = {};
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const str = []
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.concat(
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cookie.parse(req.headers.cookie || ''),
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cookie.parse(opts.headers.cookie || ''),
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cookie.parse(res.getHeader('Set-Cookie') || '')
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)
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.map(cookie => {
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return Object.keys(cookie)
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.map(name => `${name}=${encodeURIComponent(cookie[name])}`)
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.join('; ');
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})
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.filter(Boolean)
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.join(', ');
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opts.headers.cookie = str;
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}
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}
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return fetch(parsed.href, opts);
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},
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store
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};
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const root_preloaded = manifest.root.preload
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? manifest.root.preload.call(preload_context, {
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path: req.path,
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query: req.query,
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params: {}
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})
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: {};
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const match = error ? null : page.pattern.exec(req.path);
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Promise.all([root_preloaded].concat(page.parts.map(part => {
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if (!part) return null;
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return part.component.preload
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? part.component.preload.call(preload_context, {
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path: req.path,
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query: req.query,
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params: part.params ? part.params(match) : {}
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})
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: {};
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}))).catch(err => {
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preload_error = { statusCode: 500, message: err };
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return []; // appease TypeScript
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}).then(preloaded => {
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if (redirect) {
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const location = `${req.baseUrl}/${redirect.location}`;
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res.statusCode = redirect.statusCode;
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res.setHeader('Location', location);
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res.end();
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return;
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}
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if (preload_error) {
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handle_error(req, res, preload_error.statusCode, preload_error.message);
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return;
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}
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const serialized = {
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preloaded: `[${preloaded.map(data => try_serialize(data)).join(',')}]`,
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store: store && try_serialize(store.get())
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};
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const segments = req.path.split('/').filter(Boolean);
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const props: Props = {
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path: req.path,
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query: req.query,
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params: {},
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child: null
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};
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if (error) {
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props.error = error instanceof Error ? error : { message: error };
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props.status = status;
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}
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const data = Object.assign({}, props, preloaded[0], {
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params: {},
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child: {
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segment: segments[0]
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}
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});
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let level = data.child;
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for (let i = 0; i < page.parts.length; i += 1) {
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const part = page.parts[i];
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if (!part) continue;
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const get_params = part.params || (() => ({}));
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Object.assign(level, {
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component: part.component,
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props: Object.assign({}, props, {
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params: get_params(match)
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}, preloaded[i + 1])
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});
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level.props.child = <Props["child"]>{
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segment: segments[i + 1]
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};
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level = level.props.child;
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}
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const { html, head, css } = manifest.root.render(data, {
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store
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});
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let script = `__SAPPER__={${[
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error && `error:1`,
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`baseUrl:"${req.baseUrl}"`,
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serialized.preloaded && `preloaded:${serialized.preloaded}`,
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serialized.store && `store:${serialized.store}`
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].filter(Boolean).join(',')}};`;
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if (has_service_worker) {
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script += `if('serviceWorker' in navigator)navigator.serviceWorker.register('${req.baseUrl}/service-worker.js');`;
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}
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const file = [].concat(build_info.assets.main).filter(file => file && /\.js$/.test(file))[0];
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const main = `${req.baseUrl}/client/${file}`;
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if (build_info.bundler === 'rollup') {
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if (build_info.legacy_assets) {
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const legacy_main = `${req.baseUrl}/client/legacy/${build_info.legacy_assets.main}`;
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script += `(function(){try{eval("async function x(){}");var main="${main}"}catch(e){main="${legacy_main}"};try{new Function("import('"+main+"')")();}catch(e){var s=document.createElement("script");s.src="${req.baseUrl}/client/shimport@${build_info.shimport}.js";s.setAttribute("data-main",main);document.head.appendChild(s);}}());`;
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} else {
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script += `try{new Function("import('${main}')")();}catch(e){var s=document.createElement("script");s.src="${req.baseUrl}/client/shimport@${build_info.shimport}.js";s.setAttribute("data-main","${main}");document.head.appendChild(s);}`;
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}
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} else {
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script += `</script><script src="${main}">`;
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}
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let styles: string;
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// TODO make this consistent across apps
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// TODO embed build_info in placeholder.ts
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if (build_info.css && build_info.css.main) {
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const css_chunks = new Set();
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if (build_info.css.main) css_chunks.add(build_info.css.main);
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page.parts.forEach(part => {
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if (!part) return;
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const css_chunks_for_part = build_info.css.chunks[part.file];
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if (css_chunks_for_part) {
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css_chunks_for_part.forEach(file => {
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css_chunks.add(file);
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});
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}
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});
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styles = Array.from(css_chunks)
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.map(href => `<link rel="stylesheet" href="client/${href}">`)
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.join('')
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} else {
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styles = (css && css.code ? `<style>${css.code}</style>` : '');
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}
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// users can set a CSP nonce using res.locals.nonce
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const nonce_attr = (res.locals && res.locals.nonce) ? ` nonce="${res.locals.nonce}"` : '';
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const body = template()
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.replace('%sapper.base%', () => `<base href="${req.baseUrl}/">`)
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.replace('%sapper.scripts%', () => `<script${nonce_attr}>${script}</script>`)
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.replace('%sapper.html%', () => html)
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.replace('%sapper.head%', () => `<noscript id='sapper-head-start'></noscript>${head}<noscript id='sapper-head-end'></noscript>`)
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.replace('%sapper.styles%', () => styles);
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res.statusCode = status;
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res.end(body);
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}).catch(err => {
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if (error) {
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// we encountered an error while rendering the error page — oops
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res.statusCode = 500;
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res.end(`<pre>${escape_html(err.message)}</pre>`);
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} else {
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handle_error(req, res, 500, err);
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}
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});
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}
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return function find_route(req: Req, res: Res, next: () => void) {
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if (req[IGNORE]) return next();
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if (!server_routes.some(route => route.pattern.test(req.path))) {
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for (const page of pages) {
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if (page.pattern.test(req.path)) {
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handle_page(page, req, res);
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return;
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}
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}
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}
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handle_error(req, res, 404, 'Not found');
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};
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}
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function read_template(dir = build_dir) {
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return fs.readFileSync(`${dir}/template.html`, 'utf-8');
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}
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function try_serialize(data: any) {
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try {
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return devalue(data);
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} catch (err) {
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return null;
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}
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}
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function escape_html(html: string) {
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const chars: Record<string, string> = {
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'"' : 'quot',
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"'": '#39',
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'&': 'amp',
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'<' : 'lt',
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'>' : 'gt'
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};
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return html.replace(/["'&<>]/g, c => `&${chars[c]};`);
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}
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