Created
April 10, 2024 08:49
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Simple function to fetch users real IP address in nextjs app on vercel including cloudflare proxy
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| /** | |
| * The fallback IP address to use if the real IP address cannot be determined. | |
| */ | |
| const FALLBACK_IP_ADDRESS = '0.0.0.0'; | |
| /** | |
| * Returns the real IP address of the client. | |
| * @param request - The incoming request. | |
| * @param cfProxy - Whether the client is behind a Cloudflare proxy. | |
| * @returns The real IP address of the client. | |
| */ | |
| function realIP(request: NextRequest, cfProxy = false): string { | |
| const headers = request.headers; | |
| /** | |
| * Cloudflare only headers. | |
| */ | |
| if (cfProxy && headers.has('cf-connecting-ip')) { | |
| return headers.get('cf-connecting-ip'); | |
| } | |
| if (headers.has('x-real-ip')) { | |
| return headers.get('x-real-ip'); | |
| } | |
| if (headers.has('x-forwarded-for')) { | |
| return headers.get('x-forwarded-for'); | |
| } | |
| if (headers.has('x-vercel-forwarded-for')) { | |
| return headers.get('x-vercel-forwarded-for'); | |
| } | |
| if (headers.has('x-vercel-proxied-for')) { | |
| return headers.get('x-vercel-proxied-for'); | |
| } | |
| /** | |
| * The fallback IP address. | |
| */ | |
| return request.ip ?? FALLBACK_IP_ADDRESS; | |
| } |
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