/
render.js
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/
render.js
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import * as devalue from 'devalue';
import { readable, writable } from 'svelte/store';
import { DEV } from 'esm-env';
import { hash } from '../../hash.js';
import { serialize_data } from './serialize_data.js';
import { s } from '../../../utils/misc.js';
import { Csp } from './csp.js';
import { uneval_action_response } from './actions.js';
import { clarify_devalue_error } from '../utils.js';
import { assets, base, version } from '../../shared.js';
import { env } from '../../env-public.js';
import { text } from '../../../exports/index.js';
// TODO rename this function/module
const updated = {
...readable(false),
check: () => false
};
/**
* Creates the HTML response.
* @param {{
* branch: Array<import('./types').Loaded>;
* fetched: Array<import('./types').Fetched>;
* options: import('types').SSROptions;
* manifest: import('types').SSRManifest;
* state: import('types').SSRState;
* page_config: { ssr: boolean; csr: boolean };
* status: number;
* error: App.Error | null;
* event: import('types').RequestEvent;
* resolve_opts: import('types').RequiredResolveOptions;
* action_result?: import('types').ActionResult;
* }} opts
*/
export async function render_response({
branch,
fetched,
options,
manifest,
state,
page_config,
status,
error = null,
event,
resolve_opts,
action_result
}) {
if (state.prerendering) {
if (options.csp.mode === 'nonce') {
throw new Error('Cannot use prerendering if config.kit.csp.mode === "nonce"');
}
if (options.app_template_contains_nonce) {
throw new Error('Cannot use prerendering if page template contains %sveltekit.nonce%');
}
}
const { entry } = manifest._;
const stylesheets = new Set(entry.stylesheets);
const modulepreloads = new Set(entry.imports);
const fonts = new Set(manifest._.entry.fonts);
/** @type {Set<string>} */
const link_header_preloads = new Set();
/** @type {Map<string, string>} */
// TODO if we add a client entry point one day, we will need to include inline_styles with the entry, otherwise stylesheets will be linked even if they are below inlineStyleThreshold
const inline_styles = new Map();
let rendered;
const form_value =
action_result?.type === 'success' || action_result?.type === 'failure'
? action_result.data ?? null
: null;
if (page_config.ssr) {
if (__SVELTEKIT_DEV__ && !branch.at(-1)?.node.component) {
// Can only be the leaf, layouts have a fallback component generated
throw new Error(`Missing +page.svelte component for route ${event.route.id}`);
}
/** @type {Record<string, any>} */
const props = {
stores: {
page: writable(null),
navigating: writable(null),
updated
},
components: await Promise.all(branch.map(({ node }) => node.component())),
form: form_value
};
let data = {};
// props_n (instead of props[n]) makes it easy to avoid
// unnecessary updates for layout components
for (let i = 0; i < branch.length; i += 1) {
data = { ...data, ...branch[i].data };
props[`data_${i}`] = data;
}
props.page = {
error,
params: /** @type {Record<string, any>} */ (event.params),
route: event.route,
status,
url: event.url,
data,
form: form_value
};
rendered = options.root.render(props);
for (const { node } of branch) {
if (node.imports) {
node.imports.forEach((url) => modulepreloads.add(url));
}
if (node.stylesheets) {
node.stylesheets.forEach((url) => stylesheets.add(url));
}
if (node.fonts) {
node.fonts.forEach((url) => fonts.add(url));
}
if (node.inline_styles) {
Object.entries(await node.inline_styles()).forEach(([k, v]) => inline_styles.set(k, v));
}
}
} else {
rendered = { head: '', html: '', css: { code: '', map: null } };
}
let head = '';
let body = rendered.html;
const csp = new Csp(options.csp, {
prerender: !!state.prerendering
});
const target = hash(body);
/**
* The prefix to use for static assets. Replaces `%sveltekit.assets%` in the template
* @type {string}
*/
let resolved_assets;
if (assets) {
// if an asset path is specified, use it
resolved_assets = assets;
} else if (state.prerendering?.fallback) {
// if we're creating a fallback page, asset paths need to be root-relative
resolved_assets = base;
} else {
// otherwise we want asset paths to be relative to the page, so that they
// will work in odd contexts like IPFS, the internet archive, and so on
const segments = event.url.pathname.slice(base.length).split('/').slice(2);
resolved_assets = segments.length > 0 ? segments.map(() => '..').join('/') : '.';
}
/** @param {string} path */
const prefixed = (path) => (path.startsWith('/') ? path : `${resolved_assets}/${path}`);
const serialized = { data: '', form: 'null', error: 'null' };
try {
serialized.data = `[${branch
.map(({ server_data }) => {
if (server_data?.type === 'data') {
const data = devalue.uneval(server_data.data);
const uses = [];
if (server_data.uses.dependencies.size > 0) {
uses.push(`dependencies:${s(Array.from(server_data.uses.dependencies))}`);
}
if (server_data.uses.params.size > 0) {
uses.push(`params:${s(Array.from(server_data.uses.params))}`);
}
if (server_data.uses.parent) uses.push(`parent:1`);
if (server_data.uses.route) uses.push(`route:1`);
if (server_data.uses.url) uses.push(`url:1`);
return `{type:"data",data:${data},uses:{${uses.join(',')}}${
server_data.slash ? `,slash:${s(server_data.slash)}` : ''
}}`;
}
return s(server_data);
})
.join(',')}]`;
} catch (e) {
const error = /** @type {any} */ (e);
throw new Error(clarify_devalue_error(event, error));
}
if (form_value) {
serialized.form = uneval_action_response(form_value, /** @type {string} */ (event.route.id));
}
if (error) {
serialized.error = devalue.uneval(error);
}
if (inline_styles.size > 0) {
const content = Array.from(inline_styles.values()).join('\n');
const attributes = __SVELTEKIT_DEV__ ? [' data-sveltekit'] : [];
if (csp.style_needs_nonce) attributes.push(` nonce="${csp.nonce}"`);
csp.add_style(content);
head += `\n\t<style${attributes.join('')}>${content}</style>`;
}
for (const dep of stylesheets) {
const path = prefixed(dep);
if (resolve_opts.preload({ type: 'css', path })) {
const attributes = ['rel="stylesheet"'];
if (inline_styles.has(dep)) {
// don't load stylesheets that are already inlined
// include them in disabled state so that Vite can detect them and doesn't try to add them
attributes.push('disabled', 'media="(max-width: 0)"');
} else {
const preload_atts = ['rel="preload"', 'as="style"'];
link_header_preloads.add(`<${encodeURI(path)}>; ${preload_atts.join(';')}; nopush`);
}
head += `\n\t\t<link href="${path}" ${attributes.join(' ')}>`;
}
}
for (const dep of fonts) {
const path = prefixed(dep);
if (resolve_opts.preload({ type: 'font', path })) {
const ext = dep.slice(dep.lastIndexOf('.') + 1);
const attributes = [
'rel="preload"',
'as="font"',
`type="font/${ext}"`,
`href="${path}"`,
'crossorigin'
];
head += `\n\t\t<link ${attributes.join(' ')}>`;
}
}
if (page_config.csr) {
const opts = [
`env: ${s(env)}`,
`paths: ${s({ assets, base })}`,
`target: document.querySelector('[data-sveltekit-hydrate="${target}"]').parentNode`,
`version: ${s(version)}`
];
if (page_config.ssr) {
const hydrate = [
`node_ids: [${branch.map(({ node }) => node.index).join(', ')}]`,
`data: ${serialized.data}`,
`form: ${serialized.form}`,
`error: ${serialized.error}`
];
if (status !== 200) {
hydrate.push(`status: ${status}`);
}
if (options.embedded) {
hydrate.push(`params: ${devalue.uneval(event.params)}`, `route: ${s(event.route)}`);
}
opts.push(`hydrate: {\n\t\t\t\t\t${hydrate.join(',\n\t\t\t\t\t')}\n\t\t\t\t}`);
}
// prettier-ignore
const init_app = `
import { start } from ${s(prefixed(entry.file))};
start({
${opts.join(',\n\t\t\t\t')}
});
`;
for (const dep of modulepreloads) {
const path = prefixed(dep);
if (resolve_opts.preload({ type: 'js', path })) {
link_header_preloads.add(`<${encodeURI(path)}>; rel="modulepreload"; nopush`);
if (state.prerendering) {
head += `\n\t\t<link rel="modulepreload" href="${path}">`;
}
}
}
const attributes = ['type="module"', `data-sveltekit-hydrate="${target}"`];
csp.add_script(init_app);
if (csp.script_needs_nonce) {
attributes.push(`nonce="${csp.nonce}"`);
}
body += `\n\t\t<script ${attributes.join(' ')}>${init_app}</script>`;
}
if (page_config.ssr && page_config.csr) {
body += `\n\t${fetched
.map((item) =>
serialize_data(item, resolve_opts.filterSerializedResponseHeaders, !!state.prerendering)
)
.join('\n\t')}`;
}
if (options.service_worker) {
const opts = __SVELTEKIT_DEV__ ? `, { type: 'module' }` : '';
// we use an anonymous function instead of an arrow function to support
// older browsers (https://github.com/sveltejs/kit/pull/5417)
const init_service_worker = `
if ('serviceWorker' in navigator) {
addEventListener('load', function () {
navigator.serviceWorker.register('${prefixed('service-worker.js')}'${opts});
});
}
`;
// always include service worker unless it's turned off explicitly
csp.add_script(init_service_worker);
head += `
<script${csp.script_needs_nonce ? ` nonce="${csp.nonce}"` : ''}>${init_service_worker}</script>`;
}
if (state.prerendering) {
// TODO read headers set with setHeaders and convert into http-equiv where possible
const http_equiv = [];
const csp_headers = csp.csp_provider.get_meta();
if (csp_headers) {
http_equiv.push(csp_headers);
}
if (state.prerendering.cache) {
http_equiv.push(`<meta http-equiv="cache-control" content="${state.prerendering.cache}">`);
}
if (http_equiv.length > 0) {
head = http_equiv.join('\n') + head;
}
}
// add the content after the script/css links so the link elements are parsed first
head += rendered.head;
const html = options.templates.app({
head,
body,
assets: resolved_assets,
nonce: /** @type {string} */ (csp.nonce),
env
});
// TODO flush chunks as early as we can
const transformed =
(await resolve_opts.transformPageChunk({
html,
done: true
})) || '';
if (DEV && page_config.csr) {
if (transformed.split('<!--').length < html.split('<!--').length) {
// the \u001B stuff is ANSI codes, so that we don't need to add a library to the runtime
// https://svelte.dev/repl/1b3f49696f0c44c881c34587f2537aa2
console.warn(
"\u001B[1m\u001B[31mRemoving comments in transformPageChunk can break Svelte's hydration\u001B[39m\u001B[22m"
);
}
}
const headers = new Headers({
'x-sveltekit-page': 'true',
'content-type': 'text/html',
etag: `"${hash(transformed)}"`
});
if (!state.prerendering) {
const csp_header = csp.csp_provider.get_header();
if (csp_header) {
headers.set('content-security-policy', csp_header);
}
const report_only_header = csp.report_only_provider.get_header();
if (report_only_header) {
headers.set('content-security-policy-report-only', report_only_header);
}
if (link_header_preloads.size) {
headers.set('link', Array.from(link_header_preloads).join(', '));
}
}
return text(transformed, {
status,
headers
});
}