add mutable.filter.ts file

filters/mutable.filter.ts

@@ -0,0 +1,28 @@
+import { Filter, FilterResult } from './pool-filters';
+import { Connection, PublicKey } from '@solana/web3.js';
+import { LiquidityPoolKeysV4 } from '@raydium-io/raydium-sdk';
+import { getPdaMetadataKey } from '@raydium-io/raydium-sdk';
+import { getMetadataAccountDataSerializer, MetadataAccountData } from '@metaplex-foundation/mpl-token-metadata';
+import { logger } from '../helpers';
+
+export class MutableFilter implements Filter {
+  constructor(private readonly connection: Connection) {}
+
+  async execute(poolKeys: LiquidityPoolKeysV4): Promise<FilterResult> {
+    try {
+      const metadataPDA = getPdaMetadataKey(poolKeys.baseMint);
+      const metadataAccount = await this.connection.getAccountInfo(new PublicKey(metadataPDA.publicKey.toString()));
+      if (!metadataAccount?.data) {
+        return { ok: false, message: 'Mutable -> Failed to fetch account data' };
+      }
+      const deserialize = getMetadataAccountDataSerializer().deserialize(metadataAccount.data);
+      const mutable = deserialize[0].isMutable;
+
+      return { ok: !mutable, message: !mutable ? undefined : "Mutable -> Creator can change metadata" };
+    } catch (e: any) {
+      logger.error({ mint: poolKeys.baseMint }, `Mutable -> Failed to check if metadata are mutable`);
+    }
+
+    return { ok: false, message: 'Mutable -> Failed to check if metadata are mutable' };
+  }
+}