feat: get all token balances

src/utils/tokenMetadata.ts

@@ -0,0 +1,83 @@
+import { Connection, PublicKey } from "@solana/web3.js";
+
+export async function getTokenMetadata(
+  connection: Connection,
+  tokenMint: string,
+) {
+  const METADATA_PROGRAM_ID = new PublicKey(
+    "metaqbxxUerdq28cj1RbAWkYQm3ybzjb6a8bt518x1s",
+  );
+
+  const [metadataPDA] = PublicKey.findProgramAddressSync(
+    [
+      Buffer.from("metadata"),
+      METADATA_PROGRAM_ID.toBuffer(),
+      new PublicKey(tokenMint).toBuffer(),
+    ],
+    METADATA_PROGRAM_ID,
+  );
+
+  const metadata = await connection.getAccountInfo(metadataPDA);
+  if (!metadata?.data) {
+    throw new Error("Metadata not found");
+  }
+
+  let offset = 1 + 32 + 32; // key + update auth + mint
+  const data = metadata.data;
+  const decoder = new TextDecoder();
+
+  // Read variable length strings
+  const readString = () => {
+    let nameLength = data[offset];
+
+    while (nameLength === 0) {
+      offset++;
+      nameLength = data[offset];
+      if (offset >= data.length) {
+        return null;
+      }
+    }
+
+    offset++;
+    const name = decoder
+      .decode(data.slice(offset, offset + nameLength))
+      // @eslint-disable-next-line no-control-regex
+      .replace(new RegExp(String.fromCharCode(0), "g"), "");
+    offset += nameLength;
+    return name;
+  };
+
+  const name = readString();
+  const symbol = readString();
+  const uri = readString();
+
+  // Read remaining data
+  const sellerFeeBasisPoints = data.readUInt16LE(offset);
+  offset += 2;
+
+  let creators:
+    | { address: PublicKey; verified: boolean; share: number }[]
+    | null = null;
+  if (data[offset] === 1) {
+    offset++;
+    const numCreators = data[offset];
+    offset++;
+    creators = [...Array(numCreators)].map(() => {
+      const creator = {
+        address: new PublicKey(data.slice(offset, offset + 32)),
+        verified: data[offset + 32] === 1,
+        share: data[offset + 33],
+      };
+      offset += 34;
+      return creator;
+    });
+  }
+
+  return {
+    name,
+    symbol,
+    uri,
+    sellerFeeBasisPoints,
+    creators,
+  };
+}