use custom ip masking instead of library

TODO.txt

@@ -253,7 +253,8 @@
 * create more prominant discord link DONE 12/20/2024
 * make defense post stronger & larger radius DONE 12/20/2024
 * make event box wider DONE 12/20/2024
-* make attack bonus based on current attack size
+* make attack bonus based on current attack size DONE 12/20/2024
+* bug: ips are not stored
 * highlight player spawn
 * troop density affects attack bonus
 * bug: NPCs don't have money

src/server/Archive.ts

@@ -1,8 +1,6 @@
 import { GameConfig, GameID, GameRecord, GameRecordSchema, Turn } from "../core/Schemas";
 import { Storage } from '@google-cloud/storage';
 import { BigQuery } from '@google-cloud/bigquery';
-// import { anonymize } from 'ip-anonymize';
-import anonymize from 'ip-anonymize';
 
 
 
@@ -26,7 +24,7 @@ export async function archive(gameRecord: GameRecord) {
                 username: p.username,
                 // Masks last couple of bits from ip for
                 // user privacy.
-                ip: anonymize(p.ip),
+                ip: anonymizeIP(p.ip),
                 persistentID: p.persistentID,
                 clientID: p.clientID,
             })),
@@ -90,4 +88,41 @@ export async function archive(gameRecord: GameRecord) {
             console.log(`error handling archive error: ${error}`)
         }
     }
+}
+
+function anonymizeIP(ip: string): string {
+    // IPv4 regex that validates octets are 0-255
+    const ipv4Regex = /^(?:(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\.){3}(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)$/;
+
+    // More permissive IPv6 regex that handles compressed notation
+    const ipv6Regex = /^(?:(?:[0-9a-fA-F]{1,4}:){7}[0-9a-fA-F]{1,4}|(?:[0-9a-fA-F]{1,4}:){1,7}:|(?:[0-9a-fA-F]{1,4}:){1,6}:[0-9a-fA-F]{1,4}|(?:[0-9a-fA-F]{1,4}:){1,5}(?::[0-9a-fA-F]{1,4}){1,2}|(?:[0-9a-fA-F]{1,4}:){1,4}(?::[0-9a-fA-F]{1,4}){1,3}|(?:[0-9a-fA-F]{1,4}:){1,3}(?::[0-9a-fA-F]{1,4}){1,4}|(?:[0-9a-fA-F]{1,4}:){1,2}(?::[0-9a-fA-F]{1,4}){1,5}|[0-9a-fA-F]{1,4}:(?:(?::[0-9a-fA-F]{1,4}){1,6})|:(?:(?::[0-9a-fA-F]{1,4}){1,7}|:)|fe80:(?::[0-9a-fA-F]{0,4}){0,4}%[0-9a-zA-Z]{1,}|::(?:ffff(?::0{1,4}){0,1}:){0,1}(?:(?:25[0-5]|(?:2[0-4]|1{0,1}[0-9]){0,1}[0-9])\.){3,3}(?:25[0-5]|(?:2[0-4]|1{0,1}[0-9]){0,1}[0-9])|(?:[0-9a-fA-F]{1,4}:){1,4}:(?:(?:25[0-5]|(?:2[0-4]|1{0,1}[0-9]){0,1}[0-9])\.){3,3}(?:25[0-5]|(?:2[0-4]|1{0,1}[0-9]){0,1}[0-9]))$/;
+
+    // For IPv4, keep first three octets, mask the last
+    if (ipv4Regex.test(ip)) {
+        const octets = ip.split('.');
+        return `${octets[0]}.${octets[1]}.${octets[2]}.*`;
+    }
+
+    // For IPv6, normalize the address first (expand ::)
+    if (ipv6Regex.test(ip)) {
+        // Handle compressed notation
+        const expandedIP = ip.includes('::')
+            ? expandIPv6(ip)
+            : ip;
+
+        const segments = expandedIP.split(':');
+        return `${segments.slice(0, 6).join(':')}:****:****`;
+    }
+
+    throw new Error('Invalid IP address format');
+}
+
+// Helper function to expand IPv6 compressed notation
+function expandIPv6(ip: string): string {
+    const parts = ip.split('::');
+    const firstPart = parts[0] ? parts[0].split(':') : [];
+    const secondPart = parts[1] ? parts[1].split(':') : [];
+    const missing = 8 - (firstPart.length + secondPart.length);
+    const expanded = [...firstPart, ...Array(missing).fill('0000'), ...secondPart];
+    return expanded.map(x => x.padStart(4, '0')).join(':');
 }