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Add fetch to RequestEvent #7113

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merged 10 commits into from
Oct 4, 2022
Merged

Add fetch to RequestEvent #7113

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e1f6069
move fetch.js up one level
Rich-Harris Sep 30, 2022
f6ab853
move cookie logic out of fetch.js and into cookie.js
Rich-Harris Sep 30, 2022
1a283e8
move response wrapping inside load_data
Rich-Harris Oct 1, 2022
9fec82d
return fetch implementation from create_fetch
Rich-Harris Oct 1, 2022
a73c90a
move fetch onto RequestEvent
Rich-Harris Oct 1, 2022
9465d80
defocus test
Rich-Harris Oct 1, 2022
886cf9d
prevent infinite loops
Rich-Harris Oct 1, 2022
0648824
add changeset
Rich-Harris Oct 1, 2022
3104a54
lint
Rich-Harris Oct 1, 2022
cc74f19
Update packages/kit/src/runtime/server/index.js
Rich-Harris Oct 2, 2022
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5 changes: 5 additions & 0 deletions .changeset/curvy-suits-sleep.md
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Original file line number Diff line number Diff line change
@@ -0,0 +1,5 @@
---
'@sveltejs/kit': patch
---

Add `fetch` to `RequestEvent`
57 changes: 48 additions & 9 deletions packages/kit/src/runtime/server/cookie.js
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Original file line number Diff line number Diff line change
Expand Up @@ -5,8 +5,12 @@ import { parse, serialize } from 'cookie';
* @param {URL} url
*/
export function get_cookies(request, url) {
/** @type {Map<string, import('./page/types').Cookie>} */
const new_cookies = new Map();
const header = request.headers.get('cookie') ?? '';

const initial_cookies = parse(header);

/** @type {Record<string, import('./page/types').Cookie>} */
const new_cookies = {};

/** @type {import('cookie').CookieSerializeOptions} */
const defaults = {
Expand All @@ -27,7 +31,7 @@ export function get_cookies(request, url) {
* @param {import('cookie').CookieParseOptions} opts
*/
get(name, opts) {
const c = new_cookies.get(name);
const c = new_cookies[name];
if (
c &&
domain_matches(url.hostname, c.options.domain) &&
Expand All @@ -37,7 +41,7 @@ export function get_cookies(request, url) {
}

const decode = opts?.decode || decodeURIComponent;
const req_cookies = parse(request.headers.get('cookie') ?? '', { decode });
const req_cookies = parse(header, { decode });
return req_cookies[name]; // the decoded string or undefined
},

Expand All @@ -47,30 +51,30 @@ export function get_cookies(request, url) {
* @param {import('cookie').CookieSerializeOptions} opts
*/
set(name, value, opts = {}) {
new_cookies.set(name, {
new_cookies[name] = {
name,
value,
options: {
...defaults,
...opts
}
});
};
},

/**
* @param {string} name
* @param {import('cookie').CookieSerializeOptions} opts
*/
delete(name, opts = {}) {
new_cookies.set(name, {
new_cookies[name] = {
name,
value: '',
options: {
...defaults,
...opts,
maxAge: 0
}
});
};
},

/**
Expand All @@ -86,7 +90,42 @@ export function get_cookies(request, url) {
}
};

return { cookies, new_cookies };
/**
* @param {URL} destination
* @param {string | null} header
*/
function get_cookie_header(destination, header) {
/** @type {Record<string, string>} */
const combined_cookies = {};

// cookies sent by the user agent have lowest precedence
for (const name in initial_cookies) {
combined_cookies[name] = initial_cookies[name];
}

// cookies previous set during this event with cookies.set have higher precedence
for (const key in new_cookies) {
const cookie = new_cookies[key];
if (!domain_matches(destination.hostname, cookie.options.domain)) continue;
if (!path_matches(destination.pathname, cookie.options.path)) continue;

combined_cookies[cookie.name] = cookie.value;
}

// explicit header has highest precedence
if (header) {
const parsed = parse(header);
for (const name in parsed) {
combined_cookies[name] = parsed[name];
}
}

return Object.entries(combined_cookies)
.map(([name, value]) => `${name}=${value}`)
.join('; ');
}

return { cookies, new_cookies, get_cookie_header };
}

/**
Expand Down
18 changes: 9 additions & 9 deletions packages/kit/src/runtime/server/cookie.spec.js
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Original file line number Diff line number Diff line change
Expand Up @@ -64,7 +64,7 @@ test('a cookie should not be present after it is deleted', () => {
test('default values when set is called', () => {
const { cookies, new_cookies } = cookies_setup();
cookies.set('a', 'b');
const opts = new_cookies.get('a')?.options;
const opts = new_cookies['a']?.options;
assert.equal(opts?.secure, true);
assert.equal(opts?.httpOnly, true);
assert.equal(opts?.path, undefined);
Expand All @@ -74,14 +74,14 @@ test('default values when set is called', () => {
test('default values when on localhost', () => {
const { cookies, new_cookies } = cookies_setup(true);
cookies.set('a', 'b');
const opts = new_cookies.get('a')?.options;
const opts = new_cookies['a']?.options;
assert.equal(opts?.secure, false);
});

test('overridden defaults when set is called', () => {
const { cookies, new_cookies } = cookies_setup();
cookies.set('a', 'b', { secure: false, httpOnly: false, sameSite: 'strict', path: '/a/b/c' });
const opts = new_cookies.get('a')?.options;
const opts = new_cookies['a']?.options;
assert.equal(opts?.secure, false);
assert.equal(opts?.httpOnly, false);
assert.equal(opts?.path, '/a/b/c');
Expand All @@ -91,7 +91,7 @@ test('overridden defaults when set is called', () => {
test('default values when delete is called', () => {
const { cookies, new_cookies } = cookies_setup();
cookies.delete('a');
const opts = new_cookies.get('a')?.options;
const opts = new_cookies['a']?.options;
assert.equal(opts?.secure, true);
assert.equal(opts?.httpOnly, true);
assert.equal(opts?.path, undefined);
Expand All @@ -102,7 +102,7 @@ test('default values when delete is called', () => {
test('overridden defaults when delete is called', () => {
const { cookies, new_cookies } = cookies_setup();
cookies.delete('a', { secure: false, httpOnly: false, sameSite: 'strict', path: '/a/b/c' });
const opts = new_cookies.get('a')?.options;
const opts = new_cookies['a']?.options;
assert.equal(opts?.secure, false);
assert.equal(opts?.httpOnly, false);
assert.equal(opts?.path, '/a/b/c');
Expand All @@ -113,15 +113,15 @@ test('overridden defaults when delete is called', () => {
test('cannot override maxAge on delete', () => {
const { cookies, new_cookies } = cookies_setup();
cookies.delete('a', { maxAge: 1234 });
const opts = new_cookies.get('a')?.options;
const opts = new_cookies['a']?.options;
assert.equal(opts?.maxAge, 0);
});

test('last cookie set with the same name wins', () => {
const { cookies, new_cookies } = cookies_setup();
cookies.set('a', 'foo');
cookies.set('a', 'bar');
const entry = new_cookies.get('a');
const entry = new_cookies['a'];
assert.equal(entry?.value, 'bar');
});

Expand All @@ -130,8 +130,8 @@ test('cookie names are case sensitive', () => {
// not that one should do this, but we follow the spec...
cookies.set('a', 'foo');
cookies.set('A', 'bar');
const entrya = new_cookies.get('a');
const entryA = new_cookies.get('A');
const entrya = new_cookies['a'];
const entryA = new_cookies['A'];
assert.equal(entrya?.value, 'foo');
assert.equal(entryA?.value, 'bar');
});
Expand Down
161 changes: 17 additions & 144 deletions ...ages/kit/src/runtime/server/page/fetch.js → packages/kit/src/runtime/server/fetch.js
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Original file line number Diff line number Diff line change
@@ -1,66 +1,25 @@
import * as cookie from 'cookie';
import * as set_cookie_parser from 'set-cookie-parser';
import { respond } from '../index.js';
import { domain_matches, path_matches } from '../cookie.js';
import { respond } from './index.js';

/**
* @param {{
* event: import('types').RequestEvent;
* options: import('types').SSROptions;
* state: import('types').SSRState;
* route: import('types').SSRRoute | import('types').SSRErrorPage;
* prerender_default?: import('types').PrerenderOption;
* resolve_opts: import('types').RequiredResolveOptions;
* get_cookie_header: (url: URL, header: string | null) => string;
* }} opts
* @returns {typeof fetch}
*/
export function create_fetch({ event, options, state, route, prerender_default, resolve_opts }) {
/** @type {import('./types').Fetched[]} */
const fetched = [];

const initial_cookies = cookie.parse(event.request.headers.get('cookie') || '');

/** @type {import('./types').Cookie[]} */
const set_cookies = [];

/**
* @param {URL} url
* @param {string | null} header
*/
function get_cookie_header(url, header) {
/** @type {Record<string, string>} */
const new_cookies = {};

for (const cookie of set_cookies) {
if (!domain_matches(url.hostname, cookie.options.domain)) continue;
if (!path_matches(url.pathname, cookie.options.path)) continue;

new_cookies[cookie.name] = cookie.value;
}

// cookies from explicit `cookie` header take precedence over cookies previously set
// during this load with `set-cookie`, which take precedence over the cookies
// sent by the user agent
const combined_cookies = {
...initial_cookies,
...new_cookies,
...cookie.parse(header ?? '')
};

return Object.entries(combined_cookies)
.map(([name, value]) => `${name}=${value}`)
.join('; ');
}

/** @type {typeof fetch} */
const fetcher = async (info, init) => {
export function create_fetch({ event, options, state, get_cookie_header }) {
return async (info, init) => {
const request = normalize_fetch_input(info, init, event.url);

const request_body = init?.body;

/** @type {import('types').PrerenderDependency} */
let dependency;

const response = await options.hooks.handleFetch({
return await options.hooks.handleFetch({
event,
request,
fetch: async (info, init) => {
Expand Down Expand Up @@ -174,11 +133,7 @@ export function create_fetch({ event, options, state, route, prerender_default,
throw new Error('Request body must be a string or TypedArray');
}

response = await respond(request, options, {
prerender_default,
...state,
initiator: route
});
response = await respond(request, options, state);

if (state.prerendering) {
dependency = { response, body: null };
Expand All @@ -187,104 +142,22 @@ export function create_fetch({ event, options, state, route, prerender_default,

const set_cookie = response.headers.get('set-cookie');
if (set_cookie) {
set_cookies.push(
...set_cookie_parser.splitCookiesString(set_cookie).map((str) => {
const { name, value, ...options } = set_cookie_parser.parseString(str);
// options.sameSite is string, something more specific is required - type cast is safe
return /** @type{import('./types').Cookie} */ ({ name, value, options });
})
);
}

return response;
}
});

const proxy = new Proxy(response, {
get(response, key, _receiver) {
async function text() {
const body = await response.text();

if (!body || typeof body === 'string') {
const status_number = Number(response.status);
if (isNaN(status_number)) {
throw new Error(
`response.status is not a number. value: "${
response.status
}" type: ${typeof response.status}`
);
}

fetched.push({
url: request.url.startsWith(event.url.origin)
? request.url.slice(event.url.origin.length)
: request.url,
method: request.method,
request_body: /** @type {string | ArrayBufferView | undefined} */ (request_body),
response_body: body,
response: response
});

// ensure that excluded headers can't be read
const get = response.headers.get;
response.headers.get = (key) => {
const lower = key.toLowerCase();
const value = get.call(response.headers, lower);
if (value && !lower.startsWith('x-sveltekit-')) {
const included = resolve_opts.filterSerializedResponseHeaders(lower, value);
if (!included) {
throw new Error(
`Failed to get response header "${lower}" — it must be included by the \`filterSerializedResponseHeaders\` option: https://kit.svelte.dev/docs/hooks#handle`
);
}
}

return value;
};
for (const str of set_cookie_parser.splitCookiesString(set_cookie)) {
const { name, value, ...options } = set_cookie_parser.parseString(str);

// options.sameSite is string, something more specific is required - type cast is safe
event.cookies.set(
name,
value,
/** @type {import('cookie').CookieSerializeOptions} */ (options)
);
}

if (dependency) {
dependency.body = body;
}

return body;
}

if (key === 'arrayBuffer') {
return async () => {
const buffer = await response.arrayBuffer();

if (dependency) {
dependency.body = new Uint8Array(buffer);
}

// TODO should buffer be inlined into the page (albeit base64'd)?
// any conditions in which it shouldn't be?

return buffer;
};
}

if (key === 'text') {
return text;
}

if (key === 'json') {
return async () => {
return JSON.parse(await text());
};
}

// TODO arrayBuffer?

return Reflect.get(response, key, response);
return response;
}
});

return proxy;
};

return { fetcher, fetched, cookies: set_cookies };
}

/**
Expand Down
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