refactor(routes): extract IP address logic to utility function

Moves the logic for extracting and validating the client IP address
from the 'json.ts' and 'raw.ts' route handlers to a new utility
function 'getClientIp' in 'utils/get-client-ip.ts'. This change
improves code reusability and maintainability by centralizing the
IP extraction logic, reducing code duplication, and making it easier
to update or modify the IP handling logic in the future.

server/routes/json.ts

@@ -1,17 +1,7 @@
-import { defineEventHandler, getRequestHeaders } from 'h3';
+import { defineEventHandler } from 'h3';
+import { getClientIp } from '../utils/get-client-ip';
 
 export default defineEventHandler((event) => {
-  const headers = getRequestHeaders(event);
-
-  // Extract the X-Forwarded-For header
-  const forwardedFor = headers['x-forwarded-for'] || '';
-
-  // Take the leftmost (original client) IP and sanitize it
-  const userIp = forwardedFor.split(',')[0]?.trim() || event.node.req.socket.remoteAddress;
-
-  // Validate the IP address (simple regex for IPv4/IPv6)
-  const isValidIp = /^(\d{1,3}\.){3}\d{1,3}$|^[0-9a-fA-F:]+$/.test(userIp);
-  const safeIp = isValidIp ? userIp : 'Invalid IP';
-
-  return { ip: safeIp };
+  const userIp = getClientIp(event);
+  return { ip: userIp };
 });

server/routes/raw.ts

@@ -1,17 +1,8 @@
-import { defineEventHandler, getRequestHeaders } from 'h3';
+import { defineEventHandler } from 'h3';
+import { getClientIp } from '../utils/get-client-ip';
 
 export default defineEventHandler((event) => {
-  const headers = getRequestHeaders(event);
-
-  // Extract the X-Forwarded-For header
-  const forwardedFor = headers['x-forwarded-for'] || '';
-
-  // Take the leftmost (original client) IP and sanitize it
-  const userIp = forwardedFor.split(',')[0]?.trim() || event.node.req.socket.remoteAddress;
-
-  // Validate the IP address (simple regex for IPv4/IPv6)
-  const isValidIp = /^(\d{1,3}\.){3}\d{1,3}$|^[0-9a-fA-F:]+$/.test(userIp);
-  const safeIp = isValidIp ? userIp : 'Invalid IP';
-
-  return safeIp;
+  const userIp = getClientIp(event);
+  event.res.setHeader('Content-Type', 'text/plain');
+  return userIp;
 });

server/utils/get-client-ip.ts

@@ -0,0 +1,13 @@
+export function getClientIp(event) {
+  const headers = event.node.req.headers;
+
+  // Extract the X-Forwarded-For header
+  const forwardedFor = headers['x-forwarded-for'] || '';
+
+  // Take the leftmost (original client) IP and sanitize it
+  const userIp = forwardedFor.split(',')[0]?.trim() || event.node.req.socket.remoteAddress;
+
+  // Validate the IP address (simple regex for IPv4/IPv6)
+  const isValidIp = /^(\d{1,3}\.){3}\d{1,3}$|^[0-9a-fA-F:]+$/.test(userIp);
+  return isValidIp ? userIp : 'Invalid IP';
+}