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import type { ServerResponse, IncomingMessage } from 'http'
import path from 'path'
import * as fs from 'fs/promises'
import { constants } from 'fs'
import * as Log from '../../../build/output/log'
import { middlewareResponse } from '../middleware-response'
const FONT_PREFIX = '/__nextjs_font/'
const VALID_FONTS = [
'geist-latin-ext.woff2',
'geist-mono-latin-ext.woff2',
'geist-latin.woff2',
'geist-mono-latin.woff2',
]
const FONT_HEADERS = {
'Content-Type': 'font/woff2',
'Cache-Control': 'public, max-age=31536000, immutable',
} as const
export function getDevOverlayFontMiddleware() {
return async function devOverlayFontMiddleware(
req: IncomingMessage,
res: ServerResponse,
next: () => void
): Promise<void> {
try {
const { pathname } = new URL(`http://n${req.url}`)
if (!pathname.startsWith(FONT_PREFIX)) {
return next()
}
const fontFile = pathname.replace(FONT_PREFIX, '')
if (!VALID_FONTS.includes(fontFile)) {
return middlewareResponse.notFound(res)
}
const fontPath = path.resolve(__dirname, fontFile)
const fileExists = await checkFileExists(fontPath)
if (!fileExists) {
return middlewareResponse.notFound(res)
}
const fontData = await fs.readFile(fontPath)
Object.entries(FONT_HEADERS).forEach(([key, value]) => {
res.setHeader(key, value)
})
res.end(fontData)
} catch (err) {
Log.error(
'Failed to serve font:',
err instanceof Error ? err.message : err
)
return middlewareResponse.internalServerError(res)
}
}
}
async function checkFileExists(filePath: string): Promise<boolean> {
try {
await fs.access(filePath, constants.F_OK)
return true
} catch {
return false
}
}
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