This repository has been archived by the owner on Jan 11, 2023. It is now read-only.
-
-
Notifications
You must be signed in to change notification settings - Fork 437
/
get_page_handler.ts
382 lines (317 loc) · 11.2 KB
/
get_page_handler.ts
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
import { writable } from 'svelte/store';
import fs from 'fs';
import path from 'path';
import cookie from 'cookie';
import devalue from 'devalue';
import fetch from 'node-fetch';
import URL from 'url';
import { Manifest, Page, Req, Res } from './types';
import { build_dir, dev, src_dir } from '@sapper/internal/manifest-server';
import App from '@sapper/internal/App.svelte';
export function get_page_handler(
manifest: Manifest,
session_getter: (req: Req, res: Res) => any
) {
const get_build_info = dev
? () => JSON.parse(fs.readFileSync(path.join(build_dir, 'build.json'), 'utf-8'))
: (assets => () => assets)(JSON.parse(fs.readFileSync(path.join(build_dir, 'build.json'), 'utf-8')));
const template = dev
? () => read_template(src_dir)
: (str => () => str)(read_template(build_dir));
const has_service_worker = fs.existsSync(path.join(build_dir, 'service-worker.js'));
const { server_routes, pages } = manifest;
const error_route = manifest.error;
function bail(req: Req, res: Res, err: Error) {
console.error(err);
const message = dev ? escape_html(err.message) : 'Internal server error';
res.statusCode = 500;
res.end(`<pre>${message}</pre>`);
}
function handle_error(req: Req, res: Res, statusCode: number, error: Error | string) {
handle_page({
pattern: null,
parts: [
{ name: null, component: error_route }
]
}, req, res, statusCode, error || new Error('Unknown error in preload function'));
}
async function handle_page(page: Page, req: Req, res: Res, status = 200, error: Error | string = null) {
const is_service_worker_index = req.path === '/service-worker-index.html';
const build_info: {
bundler: 'rollup' | 'webpack',
shimport: string | null,
assets: Record<string, string | string[]>,
legacy_assets?: Record<string, string>
} = get_build_info();
res.setHeader('Content-Type', 'text/html');
res.setHeader('Cache-Control', dev ? 'no-cache' : 'max-age=600');
// preload main.js and current route
// TODO detect other stuff we can preload? images, CSS, fonts?
let preloaded_chunks = Array.isArray(build_info.assets.main) ? build_info.assets.main : [build_info.assets.main];
if (!error && !is_service_worker_index) {
page.parts.forEach(part => {
if (!part) return;
// using concat because it could be a string or an array. thanks webpack!
preloaded_chunks = preloaded_chunks.concat(build_info.assets[part.name]);
});
}
if (build_info.bundler === 'rollup') {
// TODO add dependencies and CSS
const link = preloaded_chunks
.filter(file => file && !file.match(/\.map$/))
.map(file => `<${req.baseUrl}/client/${file}>;rel="modulepreload"`)
.join(', ');
res.setHeader('Link', link);
} else {
const link = preloaded_chunks
.filter(file => file && !file.match(/\.map$/))
.map((file) => {
const as = /\.css$/.test(file) ? 'style' : 'script';
return `<${req.baseUrl}/client/${file}>;rel="preload";as="${as}"`;
})
.join(', ');
res.setHeader('Link', link);
}
const session = session_getter(req, res);
let redirect: { statusCode: number, location: string };
let preload_error: { statusCode: number, message: Error | string };
const preload_context = {
redirect: (statusCode: number, location: string) => {
if (redirect && (redirect.statusCode !== statusCode || redirect.location !== location)) {
throw new Error(`Conflicting redirects`);
}
location = location.replace(/^\//g, ''); // leading slash (only)
redirect = { statusCode, location };
},
error: (statusCode: number, message: Error | string) => {
preload_error = { statusCode, message };
},
fetch: (url: string, opts?: any) => {
const parsed = new URL.URL(url, `http://127.0.0.1:${process.env.PORT}${req.baseUrl ? req.baseUrl + '/' :''}`);
if (opts) {
opts = Object.assign({}, opts);
const include_cookies = (
opts.credentials === 'include' ||
opts.credentials === 'same-origin' && parsed.origin === `http://127.0.0.1:${process.env.PORT}`
);
if (include_cookies) {
opts.headers = Object.assign({}, opts.headers);
const cookies = Object.assign(
{},
cookie.parse(req.headers.cookie || ''),
cookie.parse(opts.headers.cookie || '')
);
const set_cookie = res.getHeader('Set-Cookie');
(Array.isArray(set_cookie) ? set_cookie : [set_cookie]).forEach(str => {
const match = /([^=]+)=([^;]+)/.exec(<string>str);
if (match) cookies[match[1]] = match[2];
});
const str = Object.keys(cookies)
.map(key => `${key}=${cookies[key]}`)
.join('; ');
opts.headers.cookie = str;
}
}
return fetch(parsed.href, opts);
}
};
let preloaded;
let match;
let params;
try {
const root_preloaded = manifest.root_preload
? manifest.root_preload.call(preload_context, {
host: req.headers.host,
path: req.path,
query: req.query,
params: {}
}, session)
: {};
match = error ? null : page.pattern.exec(req.path);
let toPreload = [root_preloaded];
if (!is_service_worker_index) {
toPreload = toPreload.concat(page.parts.map(part => {
if (!part) return null;
// the deepest level is used below, to initialise the store
params = part.params ? part.params(match) : {};
return part.preload
? part.preload.call(preload_context, {
host: req.headers.host,
path: req.path,
query: req.query,
params
}, session)
: {};
}))
}
preloaded = await Promise.all(toPreload);
} catch (err) {
if (error) {
return bail(req, res, err)
}
preload_error = { statusCode: 500, message: err };
preloaded = []; // appease TypeScript
}
try {
if (redirect) {
const location = URL.resolve((req.baseUrl || '') + '/', redirect.location);
res.statusCode = redirect.statusCode;
res.setHeader('Location', location);
res.end();
return;
}
if (preload_error) {
handle_error(req, res, preload_error.statusCode, preload_error.message);
return;
}
const segments = req.path.split('/').filter(Boolean);
// TODO make this less confusing
const layout_segments = [segments[0]];
let l = 1;
page.parts.forEach((part, i) => {
layout_segments[l] = segments[i + 1];
if (!part) return null;
l++;
});
const props = {
stores: {
page: {
subscribe: writable({
host: req.headers.host,
path: req.path,
query: req.query,
params
}).subscribe
},
preloading: {
subscribe: writable(null).subscribe
},
session: writable(session)
},
segments: layout_segments,
status: error ? status : 200,
error: error ? error instanceof Error ? error : { message: error } : null,
level0: {
props: preloaded[0]
},
level1: {
segment: segments[0],
props: {}
}
};
if (!is_service_worker_index) {
let l = 1;
for (let i = 0; i < page.parts.length; i += 1) {
const part = page.parts[i];
if (!part) continue;
props[`level${l++}`] = {
component: part.component,
props: preloaded[i + 1] || {},
segment: segments[i]
};
}
}
const { html, head, css } = App.render(props);
const serialized = {
preloaded: `[${preloaded.map(data => try_serialize(data)).join(',')}]`,
session: session && try_serialize(session, err => {
throw new Error(`Failed to serialize session data: ${err.message}`);
}),
error: error && try_serialize(props.error)
};
let script = `__SAPPER__={${[
error && `error:${serialized.error},status:${status}`,
`baseUrl:"${req.baseUrl}"`,
serialized.preloaded && `preloaded:${serialized.preloaded}`,
serialized.session && `session:${serialized.session}`
].filter(Boolean).join(',')}};`;
if (has_service_worker) {
script += `if('serviceWorker' in navigator)navigator.serviceWorker.register('${req.baseUrl}/service-worker.js');`;
}
const file = [].concat(build_info.assets.main).filter(file => file && /\.js$/.test(file))[0];
const main = `${req.baseUrl}/client/${file}`;
if (build_info.bundler === 'rollup') {
if (build_info.legacy_assets) {
const legacy_main = `${req.baseUrl}/client/legacy/${build_info.legacy_assets.main}`;
script += `(function(){try{eval("async function x(){}");var main="${main}"}catch(e){main="${legacy_main}"};var s=document.createElement("script");try{new Function("if(0)import('')")();s.src=main;s.type="module";s.crossOrigin="use-credentials";}catch(e){s.src="${req.baseUrl}/client/shimport@${build_info.shimport}.js";s.setAttribute("data-main",main);}document.head.appendChild(s);}());`;
} else {
script += `var s=document.createElement("script");try{new Function("if(0)import('')")();s.src="${main}";s.type="module";s.crossOrigin="use-credentials";}catch(e){s.src="${req.baseUrl}/client/shimport@${build_info.shimport}.js";s.setAttribute("data-main","${main}")}document.head.appendChild(s)`;
}
} else {
script += `</script><script src="${main}">`;
}
// users can set a CSP nonce using res.locals.nonce
const nonce_attr = (res.locals && res.locals.nonce) ? ` nonce="${res.locals.nonce}"` : '';
let styles: string;
// TODO make this consistent across apps
// TODO embed build_info in placeholder.ts
if (build_info.css && build_info.css.main) {
const css_chunks = new Set();
if (build_info.css.main) css_chunks.add(build_info.css.main);
page.parts.forEach(part => {
if (!part) return;
const css_chunks_for_part = build_info.css.chunks[part.file];
if (css_chunks_for_part) {
css_chunks_for_part.forEach(file => {
css_chunks.add(file);
});
}
});
styles = Array.from(css_chunks)
.map(href => `<link rel="stylesheet" href="client/${href}">`)
.join('')
} else {
styles = (css && css.code ? `<style${nonce_attr}>${css.code}</style>` : '');
}
const body = template()
.replace('%sapper.base%', () => `<base href="${req.baseUrl}/">`)
.replace('%sapper.scripts%', () => `<script${nonce_attr}>${script}</script>`)
.replace('%sapper.html%', () => html)
.replace('%sapper.head%', () => `<noscript id='sapper-head-start'></noscript>${head}<noscript id='sapper-head-end'></noscript>`)
.replace('%sapper.styles%', () => styles);
res.statusCode = status;
res.end(body);
} catch(err) {
if (error) {
bail(req, res, err)
} else {
handle_error(req, res, 500, err);
}
}
}
return function find_route(req: Req, res: Res, next: () => void) {
if (req.path === '/service-worker-index.html') {
const homePage = pages.find(page => page.pattern.test('/'));
handle_page(homePage, req, res);
return;
}
for (const page of pages) {
if (page.pattern.test(req.path)) {
handle_page(page, req, res);
return;
}
}
handle_error(req, res, 404, 'Not found');
};
}
function read_template(dir = build_dir) {
return fs.readFileSync(`${dir}/template.html`, 'utf-8');
}
function try_serialize(data: any, fail?: (err) => void) {
try {
return devalue(data);
} catch (err) {
if (fail) fail(err);
return null;
}
}
function escape_html(html: string) {
const chars: Record<string, string> = {
'"' : 'quot',
"'": '#39',
'&': 'amp',
'<' : 'lt',
'>' : 'gt'
};
return html.replace(/["'&<>]/g, c => `&${chars[c]};`);
}