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'image/svg+xml'\nconst CACHE_VERSION = 2\nconst MODERN_TYPES = [/* AVIF, */ WEBP]\nconst ANIMATABLE_TYPES = [WEBP, PNG, GIF]\nconst VECTOR_TYPES = [SVG]\n\nconst inflightRequests = new Map<string, Promise<undefined>>()\n\nexport async function imageOptimizer(\n server: Server,\n req: IncomingMessage,\n res: ServerResponse,\n parsedUrl: UrlWithParsedQuery,\n nextConfig: NextConfig,\n distDir: string\n) {\n const imageData: ImageConfig = nextConfig.images || imageConfigDefault\n const { deviceSizes = [], imageSizes = [], domains = [], loader } = imageData\n\n if (loader !== 'default') {\n await server.render404(req, res, parsedUrl)\n return { finished: true }\n }\n\n const { headers } = req\n const { url, w, q } = parsedUrl.query\n const mimeType = getSupportedMimeType(MODERN_TYPES, headers.accept)\n let href: string\n\n if (!url) {\n res.statusCode = 400\n res.end('\"url\" parameter is required')\n return { finished: true }\n } else if (Array.isArray(url)) {\n res.statusCode = 400\n 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res.statusCode = 400\n res.end('\"q\" parameter (quality) is required')\n return { finished: true }\n } else if (Array.isArray(q)) {\n res.statusCode = 400\n res.end('\"q\" parameter (quality) cannot be an array')\n return { finished: true }\n }\n\n // Should match output from next-image-loader\n const isStatic = url.startsWith('/_next/static/image')\n\n const width = parseInt(w, 10)\n\n if (!width || isNaN(width)) {\n res.statusCode = 400\n res.end('\"w\" parameter (width) must be a number greater than 0')\n return { finished: true }\n }\n\n const sizes = [...deviceSizes, ...imageSizes]\n\n if (!sizes.includes(width)) {\n res.statusCode = 400\n res.end(`\"w\" parameter (width) of ${width} is not allowed`)\n return { finished: true }\n }\n\n const quality = parseInt(q)\n\n if (isNaN(quality) || quality < 1 || quality > 100) {\n res.statusCode = 400\n res.end('\"q\" parameter (quality) must be a number between 1 and 100')\n return { finished: true }\n }\n\n const hash = getHash([CACHE_VERSION, href, width, quality, mimeType])\n const imagesDir = join(distDir, 'cache', 'images')\n const hashDir = join(imagesDir, hash)\n const now = Date.now()\n\n // If there're concurrent requests hitting the same resource and it's still\n // being optimized, wait before accessing the cache.\n if (inflightRequests.has(hash)) {\n await inflightRequests.get(hash)\n }\n let dedupeResolver: (val?: PromiseLike<undefined>) => void\n inflightRequests.set(\n hash,\n new Promise((resolve) => (dedupeResolver = resolve))\n )\n\n try {\n if (await fileExists(hashDir, 'directory')) {\n const files = await promises.readdir(hashDir)\n for (let file of files) {\n const [prefix, etag, extension] = file.split('.')\n const expireAt = Number(prefix)\n const contentType = getContentType(extension)\n const fsPath = join(hashDir, file)\n if (now < expireAt) {\n res.setHeader(\n 'Cache-Control',\n isStatic\n ? 'public, max-age=315360000, immutable'\n : 'public, max-age=0, must-revalidate'\n )\n if (sendEtagResponse(req, res, etag)) {\n return { finished: true }\n }\n if (contentType) {\n res.setHeader('Content-Type', contentType)\n }\n createReadStream(fsPath).pipe(res)\n return { finished: true }\n } else {\n await promises.unlink(fsPath)\n }\n }\n }\n\n let upstreamBuffer: Buffer\n let upstreamType: string | null\n let maxAge: number\n\n if (isAbsolute) {\n const upstreamRes = await fetch(href)\n\n if (!upstreamRes.ok) {\n res.statusCode = upstreamRes.status\n res.end('\"url\" parameter is valid but upstream response is invalid')\n return { finished: true }\n }\n\n res.statusCode = upstreamRes.status\n upstreamBuffer = Buffer.from(await upstreamRes.arrayBuffer())\n upstreamType = upstreamRes.headers.get('Content-Type')\n maxAge = getMaxAge(upstreamRes.headers.get('Cache-Control'))\n } else {\n try {\n const resBuffers: Buffer[] = []\n const mockRes: any = new Stream.Writable()\n\n const isStreamFinished = new Promise(function (resolve, reject) {\n mockRes.on('finish', () => resolve(true))\n mockRes.on('end', () => resolve(true))\n mockRes.on('error', () => reject())\n })\n\n mockRes.write = (chunk: Buffer | string) => {\n resBuffers.push(Buffer.isBuffer(chunk) ? chunk : Buffer.from(chunk))\n }\n mockRes._write = (chunk: Buffer | string) => {\n mockRes.write(chunk)\n }\n\n const mockHeaders: Record<string, string | string[]> = {}\n\n mockRes.writeHead = (_status: any, _headers: any) =>\n Object.assign(mockHeaders, _headers)\n mockRes.getHeader = (name: string) => mockHeaders[name.toLowerCase()]\n mockRes.getHeaders = () => mockHeaders\n mockRes.getHeaderNames = () => Object.keys(mockHeaders)\n mockRes.setHeader = (name: string, value: string | string[]) =>\n (mockHeaders[name.toLowerCase()] = value)\n mockRes._implicitHeader = () => {}\n mockRes.finished = false\n mockRes.statusCode = 200\n\n const mockReq: any = new Stream.Readable()\n\n mockReq._read = () => {\n mockReq.emit('end')\n mockReq.emit('close')\n return Buffer.from('')\n }\n\n mockReq.headers = req.headers\n mockReq.method = req.method\n mockReq.url = href\n\n await server.getRequestHandler()(\n mockReq,\n mockRes,\n nodeUrl.parse(href, true)\n )\n await isStreamFinished\n res.statusCode = mockRes.statusCode\n\n upstreamBuffer = Buffer.concat(resBuffers)\n upstreamType = mockRes.getHeader('Content-Type')\n maxAge = getMaxAge(mockRes.getHeader('Cache-Control'))\n } catch (err) {\n res.statusCode = 500\n res.end('\"url\" parameter is valid but upstream response is invalid')\n return { finished: true }\n }\n }\n\n const expireAt = maxAge * 1000 + now\n\n if (upstreamType) {\n const vector = VECTOR_TYPES.includes(upstreamType)\n const animate =\n ANIMATABLE_TYPES.includes(upstreamType) && isAnimated(upstreamBuffer)\n if (vector || animate) {\n await writeToCacheDir(hashDir, upstreamType, expireAt, upstreamBuffer)\n sendResponse(req, res, upstreamType, upstreamBuffer, isStatic)\n return { finished: true }\n }\n\n // If upstream type is not a valid image type, return 400 error.\n if (!upstreamType.startsWith('image/')) {\n res.statusCode = 400\n res.end(\"The requested resource isn't a valid image.\")\n return { finished: true }\n }\n }\n\n let contentType: string\n\n if (mimeType) {\n contentType = mimeType\n } else if (\n upstreamType?.startsWith('image/') &&\n getExtension(upstreamType)\n ) {\n contentType = upstreamType\n } else {\n contentType = JPEG\n }\n\n try {\n const orientation = await getOrientation(upstreamBuffer)\n\n const operations: Operation[] = []\n\n if (orientation === Orientation.RIGHT_TOP) {\n operations.push({ type: 'rotate', numRotations: 1 })\n } else if (orientation === Orientation.BOTTOM_RIGHT) {\n operations.push({ type: 'rotate', numRotations: 2 })\n } else if (orientation === Orientation.LEFT_BOTTOM) {\n operations.push({ type: 'rotate', numRotations: 3 })\n } else {\n // TODO: support more orientations\n // eslint-disable-next-line @typescript-eslint/no-unused-vars\n // const _: never = orientation\n }\n\n operations.push({ type: 'resize', width })\n\n let optimizedBuffer: Buffer | undefined\n //if (contentType === AVIF) {\n //} else\n if (contentType === WEBP) {\n optimizedBuffer = await processBuffer(\n upstreamBuffer,\n operations,\n 'webp',\n quality\n )\n } else if (contentType === PNG) {\n optimizedBuffer = await processBuffer(\n upstreamBuffer,\n operations,\n 'png',\n quality\n )\n } else if (contentType === JPEG) {\n optimizedBuffer = await processBuffer(\n upstreamBuffer,\n operations,\n 'jpeg',\n quality\n )\n }\n\n if (optimizedBuffer) {\n await writeToCacheDir(hashDir, contentType, expireAt, optimizedBuffer)\n sendResponse(req, res, contentType, optimizedBuffer, isStatic)\n } else {\n throw new Error('Unable to optimize buffer')\n }\n } catch (error) {\n sendResponse(req, res, upstreamType, upstreamBuffer, isStatic)\n }\n\n return { finished: true }\n } finally {\n // Make sure to remove the hash in the end.\n dedupeResolver!()\n inflightRequests.delete(hash)\n }\n}\n\nasync function writeToCacheDir(\n dir: string,\n contentType: string,\n expireAt: number,\n buffer: Buffer\n) {\n await promises.mkdir(dir, { recursive: true })\n const extension = getExtension(contentType)\n const etag = getHash([buffer])\n const filename = join(dir, `${expireAt}.${etag}.${extension}`)\n await promises.writeFile(filename, buffer)\n}\n\nfunction sendResponse(\n req: IncomingMessage,\n res: ServerResponse,\n contentType: string | null,\n buffer: Buffer,\n isStatic: boolean\n) {\n const etag = getHash([buffer])\n res.setHeader(\n 'Cache-Control',\n isStatic\n ? 'public, max-age=315360000, immutable'\n : 'public, max-age=0, must-revalidate'\n )\n if (sendEtagResponse(req, res, etag)) {\n return\n }\n if (contentType) {\n res.setHeader('Content-Type', contentType)\n }\n res.end(buffer)\n}\n\nfunction getSupportedMimeType(options: string[], accept = ''): string {\n const mimeType = mediaType(accept, options)\n return accept.includes(mimeType) ? mimeType : ''\n}\n\nfunction getHash(items: (string | number | Buffer)[]) {\n const hash = createHash('sha256')\n for (let item of items) {\n if (typeof item === 'number') hash.update(String(item))\n else {\n hash.update(item)\n }\n }\n // See https://en.wikipedia.org/wiki/Base64#Filenames\n return hash.digest('base64').replace(/\\//g, '-')\n}\n\nfunction parseCacheControl(str: string | null): Map<string, string> {\n const map = new Map<string, string>()\n if (!str) {\n return map\n }\n for (let directive of str.split(',')) {\n let [key, value] = directive.trim().split('=')\n key = key.toLowerCase()\n if (value) {\n value = value.toLowerCase()\n }\n map.set(key, value)\n }\n return map\n}\n\nexport function getMaxAge(str: string | null): number {\n const minimum = 60\n const map = parseCacheControl(str)\n if (map) {\n let age = map.get('s-maxage') || map.get('max-age') || ''\n if (age.startsWith('\"') && age.endsWith('\"')) {\n age = age.slice(1, -1)\n }\n const n = parseInt(age, 10)\n if (!isNaN(n)) {\n return Math.max(n, minimum)\n }\n }\n return minimum\n}\n"]} |