token: Metadata file

packages/token/src/metadata.ts

@@ -0,0 +1,83 @@
+import { PublicKey } from '@solana/web3.js';
+import { rustEnum, bool, u8, publicKey, str, vec, option, struct } from '@project-serum/borsh'
+import { u16 } from 'buffer-layout';
+
+const KEY_LAYOUT = rustEnum([
+	struct([], 'uninitialized'),
+	struct([], 'editionV1'),
+	struct([], 'masterEditionV1'),
+	struct([], 'reservationListV1'),
+	struct([], 'metadataV1'),
+	struct([], 'reservationListV2'),
+	struct([], 'masterEditionV2'),
+	struct([], 'editionMarker'),
+]);
+
+const CREATOR_LAYOUT = struct([
+	publicKey('address'),
+	bool('verified'),
+	u8('share'),
+])
+
+const DATA_LAYOUT = struct([
+	str('name'),
+	str('symbol'),
+	str('uri'),
+	u16('sellerFeeBasisPoints'),
+	option(vec(CREATOR_LAYOUT.replicate('creators')), 'creators')
+])
+
+const METADATA_LAYOUT = struct([
+	KEY_LAYOUT.replicate('key'),
+	publicKey('updateAuthority'),
+	publicKey('mint'),
+	DATA_LAYOUT.replicate('data'),
+	bool('primarySaleHappened'),
+	bool('isMutable'),
+	option(u8(), 'editionNonce'),
+]);
+
+export interface Metadata {
+	key: Key;
+	updateAuthority: PublicKey;
+	mint: PublicKey;
+	data: Data;
+	primarySaleHappened: boolean;
+	isMutable: boolean;
+	editionNonce: number;
+}
+
+export interface Data {
+	name: string;
+	symbol: string;
+	uri: string;
+	sellerFeeBasisPoints: number;
+	creators: Array<Creator> | null;
+}
+
+export interface Creator {
+	address: PublicKey;
+	verified: boolean;
+	share: number;
+}
+
+export type Key =
+	{ unitialized: {} }
+	| { editionV1: {} }
+	| { masterEditionV1: {} }
+	| { reserverationListV1: {} }
+	| { metadataV1: {} }
+	| { reservationListV2: {} }
+	| { masterEditionV2: {} }
+	| { editoinMarket: {} };
+
+// eslint-disable-next-line no-control-regex
+const METADATA_REPLACE = new RegExp('\u0000', 'g');
+
+export function decodeMetadata(buffer: Buffer): Metadata {
+	const metadata: any = METADATA_LAYOUT.decode(buffer);
+  metadata.data.name = metadata.data.name.replace(METADATA_REPLACE, '');
+  metadata.data.uri = metadata.data.uri.replace(METADATA_REPLACE, '');
+  metadata.data.symbol = metadata.data.symbol.replace(METADATA_REPLACE, '');
+  return metadata;
+};