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JavaScript
12345678910111213141516171819202122232425262728293031323334353637383940414243444546474849505152535455565758596061626364656667686970// The CloudFront function that keeps Astro's directory output at the no-slash// addresses a standard.site document record claims.//// It runs at the edge on every request and is deployed as a bare source file,// so nothing else in this tree type-checks or exercises it: a mistake here is// found by a reader hitting a redirect loop. These are the cases that decide// whether an address a record claims and the object serving it stay one page.
import assert from 'node:assert/strict'import { readFileSync } from 'node:fs'import { dirname, join } from 'node:path'import { test } from 'node:test'import { fileURLToPath } from 'node:url'
// The CloudFront Functions runtime wants a bare top-level handler, so the// source has no exports; evaluate it and pull the handler out.const source = readFileSync( join(dirname(fileURLToPath(import.meta.url)), '../../infra/viewer-request.js'), 'utf8',)const handler = new Function(`${source}; return handler;`)()
function run(uri, querystring = {}) { return handler({ request: { uri, querystring } })}
test('the root is left to default_root_object', () => { assert.equal(run('/').uri, '/')})
test('extensionless URIs become the index.html object', () => { assert.equal(run('/posts').uri, '/posts/index.html') assert.equal(run('/posts/hello-world').uri, '/posts/hello-world/index.html')})
test('URIs that name a file pass through untouched', () => { assert.equal(run('/atom.xml').uri, '/atom.xml') assert.equal(run('/404.html').uri, '/404.html') assert.equal(run('/_astro/index.abc123.css').uri, '/_astro/index.abc123.css') // Dots in the last segment, and no extension to add. assert.equal( run('/.well-known/site.standard.publication').uri, '/.well-known/site.standard.publication', )})
test('a trailing slash redirects to the canonical no-slash address', () => { const response = run('/posts/hello-world/') assert.equal(response.statusCode, 301) assert.equal(response.headers.location.value, '/posts/hello-world')})
test('runs of trailing slashes collapse without looping the root', () => { assert.equal(run('/posts///').headers.location.value, '/posts') assert.equal(run('///').headers.location.value, '/')})
test('a redirect keeps the query string', () => { const querystring = { ref: { value: 'feed' }, flag: { value: '' }, tag: { value: 'a', multiValue: [{ value: 'a' }, { value: 'b' }] }, } const response = run('/posts/hello-world/', querystring) assert.equal( response.headers.location.value, '/posts/hello-world?ref=feed&flag&tag=a&tag=b', )})