Files
next.js/test/e2e/edge-compiler-can-import-blob-assets/index.test.ts
df88058f5e Turbopack: switch from base40 to base38 hash encoding (remove ~ and . from charset) (#91832)
### What?

Switch Turbopack's hash encoding charset from base40 (`0-9 a-z _ - ~ .`)
to base38 (`0-9 a-z _ -`), removing the `~` and `.` characters. Pure
rename/charset change — no structural changes.

### Why?

The `~` and `.` characters in base40-encoded filenames are blocked by
standard Nginx hardening rules (`block_common_exploits.conf`) and
enterprise WAF configurations, causing **403 Forbidden errors** when
applications are deployed behind security-hardened infrastructure.

Examples of problematic filenames:
- `turbopack-0c3o1svijj_~~.js` — `~~` flagged as directory traversal /
injection
- `0...f7~att2_2.js` — `...` flagged as path traversal attempt  
- `0q~2copru0zy0.css` — `~` filtered by some WAF rulesets

Previous hex-only filenames (e.g. `turbopack-01ca012029ca2e66.js`) had
no such issues.

Fixes https://github.com/vercel/next.js/issues/91678

### How?

**Charset change** (`turbo-tasks-hash/src/base38.rs`, renamed from
`base40.rs`):
- Alphabet reduced from 40 to 38 characters:
`0123456789abcdefghijklmnopqrstuvwxyz_-`
- All constants and functions renamed: `BASE40_*` → `BASE38_*`,
`encode_base40` → `encode_base38`
- Hash lengths unchanged: 13 chars for 64-bit, 25 chars for 128-bit
(`38^13 > 2^64`, `38^25 > 2^128`)
- Content hash length stays at 13 (68.2 bits vs 69.2 bits with base40 —
negligible)

**`HashAlgorithm` enum variants** (`turbo-tasks-hash/src/lib.rs`):
- `Xxh3Hash64Base40` → `Xxh3Hash64Base38`
- `Xxh3Hash128Base40` → `Xxh3Hash128Base38`

**Bit computation comment** (`turbopack-core/src/ident.rs`):
- Updated `7 base38 chars ≈ 37 bits` → `≈ 36 bits` (log2(38) × 7 = 36.7)

**Test regex patterns** (15 test files):
- Updated `[0-9a-z_.~-]` → `[0-9a-z_-]` to match the new charset

---------

Co-authored-by: Tobias Koppers <[email protected]>
Co-authored-by: Claude <[email protected]>
2026-03-25 08:27:30 +01:00

115 lines
3.5 KiB
TypeScript

import { nextTestSetup } from 'e2e-utils'
import { fetchViaHTTP, renderViaHTTP } from 'next-test-utils'
import path from 'path'
import { promises as fs } from 'fs'
import { readJson } from 'fs-extra'
describe('Edge Compiler can import asset assets', () => {
const { next, isTurbopack, isNextDeploy } = nextTestSetup({
files: path.join(__dirname, './app'),
})
it('allows to fetch a remote URL', async () => {
const response = await fetchViaHTTP(next.url, '/api/edge', {
handler: 'remote-full',
})
expect(await response.text()).toContain('Example Domain')
})
it('allows to fetch a remote URL with a path and basename', async () => {
const response = await fetchViaHTTP(next.url, '/api/edge', {
handler: 'remote-with-base',
})
expect(await response.text()).toContain('Example Domain')
})
it('allows to fetch text assets', async () => {
const html = await renderViaHTTP(next.url, '/api/edge', {
handler: 'text-file',
})
expect(html).toContain('Hello, from text-file.txt!')
})
it('allows to fetch image assets', async () => {
const response = await fetchViaHTTP(next.url, '/api/edge', {
handler: 'image-file',
})
const buffer: Buffer = await response.buffer()
const image = await fs.readFile(
path.join(__dirname, './app/src/vercel.png')
)
expect(buffer.equals(image)).toBeTrue()
})
it('allows to assets from node_modules', async () => {
const response = await fetchViaHTTP(next.url, '/api/edge', {
handler: 'from-node-module',
})
const json = await response.json()
expect(json).toEqual({
'i am': 'a node dependency',
})
})
// Cannot read the file on deployment
if (!isNextDeploy) {
it('extracts all the assets from the bundle', async () => {
const manifestPath = path.join(
next.testDir,
next.distDir,
'server/middleware-manifest.json'
)
const manifest = await readJson(manifestPath)
const orderedAssets = manifest.functions['/api/edge'].assets.sort(
(a, z) => {
return String(a.name).localeCompare(z.name)
}
)
if (isTurbopack) {
expect(orderedAssets).toMatchObject([
{
name: expect.stringMatching(
/server\/edge\/assets\/text-file\.[0-9a-z_-]+\.txt$/
),
filePath: expect.stringMatching(/^server\/edge\/assets\/text-file/),
},
{
name: expect.stringMatching(
/^server\/edge\/assets\/vercel\.[0-9a-z_-]+\.png$/
),
filePath: expect.stringMatching(/^server\/edge\/assets\/vercel/),
},
{
name: expect.stringMatching(
/^server\/edge\/assets\/world\.[0-9a-z_-]+\.json/
),
filePath: expect.stringMatching(/^server\/edge\/assets\/world/),
},
])
} else {
expect(orderedAssets).toMatchObject([
{
name: expect.stringMatching(/^text-file\.[0-9a-f]{16}\.txt$/),
filePath: expect.stringMatching(
/^server\/edge-chunks\/asset_text-file/
),
},
{
name: expect.stringMatching(/^vercel\.[0-9a-f]{16}\.png$/),
filePath: expect.stringMatching(
/^server\/edge-chunks\/asset_vercel/
),
},
{
name: expect.stringMatching(/^world\.[0-9a-f]{16}\.json/),
filePath: expect.stringMatching(
/^server\/edge-chunks\/asset_world/
),
},
])
}
})
}
})