add confidential transfer InitializeMint

token/js/package.json

@@ -58,7 +58,8 @@
         "@solana/buffer-layout-utils": "^0.2.0",
         "@solana/spl-token-group": "^0.0.2",
         "@solana/spl-token-metadata": "^0.1.2",
-        "buffer": "^6.0.3"
+        "buffer": "^6.0.3",
+        "solana-zk-token-sdk-experimental": "^0.1.1"
     },
     "devDependencies": {
         "@solana/codecs-strings": "2.0.0-preview.2",

token/js/src/extensions/confidentialTransfer/elgamal.ts

@@ -0,0 +1,22 @@
+import { blob, Layout } from '@solana/buffer-layout';
+import { encodeDecode } from '@solana/buffer-layout-utils';
+import { PodElGamalPubkey } from 'solana-zk-token-sdk-experimental';
+
+export const elgamalPublicKey = (property?: string): Layout<PodElGamalPubkey> => {
+    const layout = blob(32, property);
+    const { encode, decode } = encodeDecode(layout);
+
+    const elgamalPublicKeyLayout = layout as Layout<unknown> as Layout<PodElGamalPubkey>;
+
+    elgamalPublicKeyLayout.decode = (buffer: Buffer, offset: number) => {
+        const src = decode(buffer, offset);
+        return new PodElGamalPubkey(src);
+    };
+
+    elgamalPublicKeyLayout.encode = (elgamalPublicKey: PodElGamalPubkey, buffer: Buffer, offset: number) => {
+        const src = elgamalPublicKey.toBytes();
+        return encode(src, buffer, offset);
+    };
+
+    return elgamalPublicKeyLayout;
+};

token/js/src/extensions/confidentialTransfer/index.ts

@@ -0,0 +1,2 @@
+export * from './state.js';
+export * from './instructions.js';

token/js/src/extensions/confidentialTransfer/instructions.ts

@@ -0,0 +1,56 @@
+import { struct, u8 } from '@solana/buffer-layout';
+import { bool, publicKey } from '@solana/buffer-layout-utils';
+import { PublicKey, TransactionInstruction } from '@solana/web3.js';
+import { programSupportsExtensions, TOKEN_2022_PROGRAM_ID } from '../../constants.js';
+import { TokenUnsupportedInstructionError } from '../../errors.js';
+import { TokenInstruction } from '../../instructions/types.js';
+import { PodElGamalPubkey } from 'solana-zk-token-sdk-experimental';
+import { elgamalPublicKey } from './elgamal.js';
+
+export enum ConfidentialTransferInstruction {
+    InitializeMint = 0,
+}
+
+export interface InitializeMintData {
+    instruction: TokenInstruction.ConfidentialTransferExtension;
+    confidentialTransferInstruction: ConfidentialTransferInstruction.InitializeMint;
+    confidentialTransferMintAuthority: PublicKey | null;
+    autoApproveNewAccounts: boolean;
+    auditorElGamalPubkey: PodElGamalPubkey | null;
+}
+
+export const initializeMintData = struct<InitializeMintData>([
+    u8('instruction'),
+    u8('confidentialTransferInstruction'),
+    publicKey('confidentialTransferMintAuthority'),
+    bool('autoApproveNewAccounts'),
+    elgamalPublicKey('auditorElGamalPubkey'),
+]);
+
+export function createConfidentialTransferInitializeMintInstruction(
+    mint: PublicKey,
+    confidentialTransferMintAuthority: PublicKey | null,
+    autoApproveNewAccounts: boolean,
+    auditorElGamalPubkey: PodElGamalPubkey | null,
+    programId = TOKEN_2022_PROGRAM_ID
+): TransactionInstruction {
+    if (!programSupportsExtensions(programId)) {
+        throw new TokenUnsupportedInstructionError();
+    }
+    const keys = [{ pubkey: mint, isSigner: false, isWritable: true }];
+
+    const data = Buffer.alloc(initializeMintData.span);
+
+    initializeMintData.encode(
+        {
+            instruction: TokenInstruction.ConfidentialTransferExtension,
+            confidentialTransferInstruction: ConfidentialTransferInstruction.InitializeMint,
+            confidentialTransferMintAuthority: confidentialTransferMintAuthority ?? PublicKey.default,
+            autoApproveNewAccounts: autoApproveNewAccounts,
+            auditorElGamalPubkey: auditorElGamalPubkey ?? PodElGamalPubkey.default(),
+        },
+        data
+    );
+
+    return new TransactionInstruction({ keys, programId, data });
+}

token/js/src/extensions/confidentialTransfer/state.ts

@@ -0,0 +1,30 @@
+import { struct } from '@solana/buffer-layout';
+import { publicKey, bool } from '@solana/buffer-layout-utils';
+import type { PublicKey } from '@solana/web3.js';
+import type { Mint } from '../../state/mint.js';
+import { ExtensionType, getExtensionData } from '../extensionType.js';
+import { PodElGamalPubkey } from 'solana-zk-token-sdk-experimental';
+import { elgamalPublicKey } from './elgamal.js';
+
+export interface ConfidentialTransferMint {
+    confidentialTransferMintAuthority: PublicKey;
+    autoApproveNewAccounts: boolean;
+    auditorElGamalPubkey: PodElGamalPubkey;
+}
+
+export const ConfidentialTransferMintLayout = struct<ConfidentialTransferMint>([
+    publicKey('confidentialTransferMintAuthority'),
+    bool('autoApproveNewAccounts'),
+    elgamalPublicKey('auditorElGamalPubkey'),
+]);
+
+export const CONFIDENTIAL_TRANSFER_MINT_SIZE = ConfidentialTransferMintLayout.span;
+
+export function getConfidentialTransferMint(mint: Mint): ConfidentialTransferMint | null {
+    const extensionData = getExtensionData(ExtensionType.ConfidentialTransferMint, mint.tlvData);
+    if (extensionData !== null) {
+        return ConfidentialTransferMintLayout.decode(extensionData);
+    } else {
+        return null;
+    }
+}

token/js/src/extensions/extensionType.ts

@@ -20,6 +20,7 @@ import { PERMANENT_DELEGATE_SIZE } from './permanentDelegate.js';
 import { TRANSFER_FEE_AMOUNT_SIZE, TRANSFER_FEE_CONFIG_SIZE } from './transferFee/index.js';
 import { TRANSFER_HOOK_ACCOUNT_SIZE, TRANSFER_HOOK_SIZE } from './transferHook/index.js';
 import { TOKEN_2022_PROGRAM_ID } from '../constants.js';
+import { CONFIDENTIAL_TRANSFER_MINT_SIZE } from './confidentialTransfer/state.js';
 
 // Sequence from https://github.com/solana-labs/solana-program-library/blob/master/token/program-2022/src/extension/mod.rs#L903
 export enum ExtensionType {
@@ -78,7 +79,7 @@ export function getTypeLen(e: ExtensionType): number {
         case ExtensionType.MintCloseAuthority:
             return MINT_CLOSE_AUTHORITY_SIZE;
         case ExtensionType.ConfidentialTransferMint:
-            return 65;
+            return CONFIDENTIAL_TRANSFER_MINT_SIZE;
         case ExtensionType.ConfidentialTransferAccount:
             return 295;
         case ExtensionType.CpiGuard:

token/js/test/e2e-2022/confidentialTransfer.test.ts

@@ -0,0 +1,89 @@
+import { expect } from 'chai';
+import type { Connection, Signer } from '@solana/web3.js';
+import { PublicKey } from '@solana/web3.js';
+import { Keypair, SystemProgram, Transaction, sendAndConfirmTransaction } from '@solana/web3.js';
+import { ElGamalKeypair, PodElGamalPubkey } from 'solana-zk-token-sdk-experimental';
+import { ExtensionType, createInitializeMintInstruction, getMint, getMintLen } from '../../src';
+import { TEST_PROGRAM_ID, newAccountWithLamports, getConnection } from '../common';
+
+import {
+    createConfidentialTransferInitializeMintInstruction,
+    getConfidentialTransferMint,
+} from '../../src/extensions/confidentialTransfer/index';
+
+const TEST_TOKEN_DECIMALS = 2;
+const MINT_EXTENSIONS = [ExtensionType.ConfidentialTransferMint];
+
+describe('confidentialTransfer', () => {
+    let connection: Connection;
+    let payer: Signer;
+    let mint: PublicKey;
+    let mintAuthority: Keypair;
+    before(async () => {
+        connection = await getConnection();
+        payer = await newAccountWithLamports(connection, 1000000000);
+    });
+
+    async function setupConfidentialTransferMint(
+        confidentialTransferMintAuthority: PublicKey | null,
+        autoApproveNewAccounts: boolean,
+        auditorPubkey: PodElGamalPubkey | null
+    ) {
+        const mintKeypair = Keypair.generate();
+        mint = mintKeypair.publicKey;
+        mintAuthority = Keypair.generate();
+        const mintLen = getMintLen(MINT_EXTENSIONS);
+
+        const mintLamports = await connection.getMinimumBalanceForRentExemption(mintLen);
+        const mintTransaction = new Transaction().add(
+            SystemProgram.createAccount({
+                fromPubkey: payer.publicKey,
+                newAccountPubkey: mint,
+                space: mintLen,
+                lamports: mintLamports,
+                programId: TEST_PROGRAM_ID,
+            }),
+            createConfidentialTransferInitializeMintInstruction(
+                mint,
+                confidentialTransferMintAuthority,
+                autoApproveNewAccounts,
+                auditorPubkey
+            ),
+            createInitializeMintInstruction(mint, TEST_TOKEN_DECIMALS, mintAuthority.publicKey, null, TEST_PROGRAM_ID)
+        );
+
+        await sendAndConfirmTransaction(connection, mintTransaction, [payer, mintKeypair], undefined);
+    }
+
+    describe('with authorities and auto approve', () => {
+        let confidentialTransferMintAuthority: Keypair;
+        let autoApproveNewAccounts: boolean;
+        let auditorKeypair: ElGamalKeypair;
+        let auditorPubkey: PodElGamalPubkey;
+        beforeEach(async () => {
+            confidentialTransferMintAuthority = Keypair.generate();
+            autoApproveNewAccounts = true;
+            auditorKeypair = ElGamalKeypair.new_rand();
+            auditorPubkey = PodElGamalPubkey.encoded(auditorKeypair.pubkey_owned());
+
+            await setupConfidentialTransferMint(
+                confidentialTransferMintAuthority.publicKey,
+                autoApproveNewAccounts,
+                auditorPubkey
+            );
+        });
+
+        it('initializes', async () => {
+            const mintInfo = await getMint(connection, mint, undefined, TEST_PROGRAM_ID);
+            const confidentialTransferMint = getConfidentialTransferMint(mintInfo);
+            expect(confidentialTransferMint).to.not.be.null;
+            if (confidentialTransferMint !== null) {
+                expect(confidentialTransferMint.confidentialTransferMintAuthority).to.eql(
+                    confidentialTransferMintAuthority.publicKey
+                );
+                expect(confidentialTransferMint.autoApproveNewAccounts).to.eql(autoApproveNewAccounts);
+                expect(confidentialTransferMint.auditorElGamalPubkey.equals(auditorPubkey)); // TODO: equals?
+            }
+        });
+    });
+});