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import type { IncomingMessage, ServerResponse } from 'http'
import type { DevToolsConfig } from '../dev-overlay/shared'
import { existsSync } from 'fs'
import { readFile, writeFile, mkdir } from 'fs/promises'
import { dirname, join } from 'path'
import { middlewareResponse } from './middleware-response'
import { devToolsConfigSchema } from '../shared/devtools-config-schema'
import { deepMerge } from '../shared/deepmerge'
const DEVTOOLS_CONFIG_FILENAME = 'next-devtools-config.json'
const DEVTOOLS_CONFIG_MIDDLEWARE_ENDPOINT = '/__nextjs_devtools_config'
export function devToolsConfigMiddleware({
distDir,
sendUpdateSignal,
}: {
distDir: string
sendUpdateSignal: (data: DevToolsConfig) => void
}) {
const configPath = join(distDir, 'cache', DEVTOOLS_CONFIG_FILENAME)
return async function devToolsConfigMiddlewareHandler(
req: IncomingMessage,
res: ServerResponse,
next: () => void
): Promise<void> {
const { pathname } = new URL(`http://n${req.url}`)
if (pathname !== DEVTOOLS_CONFIG_MIDDLEWARE_ENDPOINT) {
return next()
}
if (req.method !== 'POST') {
return middlewareResponse.methodNotAllowed(res)
}
const currentConfig = await getDevToolsConfig(distDir)
const chunks: Buffer[] = []
for await (const chunk of req) {
chunks.push(Buffer.from(chunk))
}
let body = Buffer.concat(chunks).toString('utf8')
try {
body = JSON.parse(body)
} catch (error) {
console.error('[Next.js DevTools] Invalid config body passed:', error)
return middlewareResponse.badRequest(res)
}
const validation = devToolsConfigSchema.safeParse(body)
if (!validation.success) {
console.error(
'[Next.js DevTools] Invalid config passed:',
validation.error.message
)
return middlewareResponse.badRequest(res)
}
const newConfig = deepMerge(currentConfig, validation.data)
await writeFile(configPath, JSON.stringify(newConfig, null, 2))
sendUpdateSignal(newConfig)
return middlewareResponse.noContent(res)
}
}
export async function getDevToolsConfig(
distDir: string
): Promise<DevToolsConfig> {
const configPath = join(distDir, 'cache', DEVTOOLS_CONFIG_FILENAME)
if (!existsSync(configPath)) {
await mkdir(dirname(configPath), { recursive: true })
await writeFile(configPath, JSON.stringify({}))
return {}
}
return JSON.parse(await readFile(configPath, 'utf8'))
}
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