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import { ENDPOINT_METHODS, PAGE_METHODS } from '../../constants.js';
import { negotiate } from '../../utils/http.js';
import { Redirect } from '../control.js';
import { method_not_allowed } from './utils.js';
/**
* @param {import('@sveltejs/kit').RequestEvent} event
* @param {import('types').SSREndpoint} mod
* @param {import('types').SSRState} state
* @returns {Promise<Response>}
*/
export async function render_endpoint(event, mod, state) {
const method = /** @type {import('types').HttpMethod} */ (event.request.method);
let handler = mod[method] || mod.fallback;
if (method === 'HEAD' && mod.GET && !mod.HEAD) {
handler = mod.GET;
}
if (!handler) {
return method_not_allowed(mod, method);
}
const prerender = mod.prerender ?? state.prerender_default;
if (prerender && (mod.POST || mod.PATCH || mod.PUT || mod.DELETE)) {
throw new Error('Cannot prerender endpoints that have mutative methods');
}
if (state.prerendering && !prerender) {
if (state.depth > 0) {
// if request came from a prerendered page, bail
throw new Error(`${event.route.id} is not prerenderable`);
} else {
// if request came direct from the crawler, signal that
// this route cannot be prerendered, but don't bail
return new Response(undefined, { status: 204 });
}
}
try {
let response = await handler(
/** @type {import('@sveltejs/kit').RequestEvent<Record<string, any>>} */ (event)
);
if (!(response instanceof Response)) {
throw new Error(
`Invalid response from route ${event.url.pathname}: handler should return a Response object`
);
}
if (state.prerendering) {
// the returned Response might have immutable Headers
// so we should clone them before trying to mutate them
response = new Response(response.body, {
status: response.status,
statusText: response.statusText,
headers: new Headers(response.headers)
});
response.headers.set('x-sveltekit-prerender', String(prerender));
}
return response;
} catch (e) {
if (e instanceof Redirect) {
return new Response(undefined, {
status: e.status,
headers: { location: e.location }
});
}
throw e;
}
}
/**
* @param {import('@sveltejs/kit').RequestEvent} event
*/
export function is_endpoint_request(event) {
const { method, headers } = event.request;
// These methods exist exclusively for endpoints
if (ENDPOINT_METHODS.includes(method) && !PAGE_METHODS.includes(method)) {
return true;
}
// use:enhance uses a custom header to disambiguate
if (method === 'POST' && headers.get('x-sveltekit-action') === 'true') return false;
// GET/POST requests may be for endpoints or pages. We prefer endpoints if this isn't a text/html request
const accept = event.request.headers.get('accept') ?? '*/*';
return negotiate(accept, ['*', 'text/html']) !== 'text/html';
}
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