From 561dc1ff9ed90f1caa381abc33907dae502557a6 Mon Sep 17 00:00:00 2001
From: Matthew Krak <krak@layerzerolabs.org>
Date: Wed, 14 Aug 2024 09:14:32 -0700
Subject: [PATCH] =?UTF-8?q?=20=F0=9F=97=9E=EF=B8=8F=20Added=20mintTo=20Sol?=
 =?UTF-8?q?ana=20task=20(#847)?=
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---
 examples/oft-solana/tasks/index.ts         |   1 +
 examples/oft-solana/tasks/solana/mintTo.ts | 106 +++++++++++++++++++++
 2 files changed, 107 insertions(+)
 create mode 100644 examples/oft-solana/tasks/solana/mintTo.ts

diff --git a/examples/oft-solana/tasks/index.ts b/examples/oft-solana/tasks/index.ts
index 1037a9e38..27c1b64fb 100644
--- a/examples/oft-solana/tasks/index.ts
+++ b/examples/oft-solana/tasks/index.ts
@@ -1,6 +1,7 @@
 import './common/wire'
 import './solana/createOFT'
 import './solana/createOFTAdapter'
+import './solana/mintTo'
 import './solana/sendOFT'
 import './solana/setFreezeAuthority'
 import './solana/setOFTMintAuthority'
diff --git a/examples/oft-solana/tasks/solana/mintTo.ts b/examples/oft-solana/tasks/solana/mintTo.ts
new file mode 100644
index 000000000..18b3a6e76
--- /dev/null
+++ b/examples/oft-solana/tasks/solana/mintTo.ts
@@ -0,0 +1,106 @@
+// Import necessary modules and classes from Solana SDKs and other libraries
+import assert from 'assert'
+
+import { bs58 } from '@coral-xyz/anchor/dist/cjs/utils/bytes'
+import { fetchDigitalAsset } from '@metaplex-foundation/mpl-token-metadata'
+import { mplToolbox, setComputeUnitPrice } from '@metaplex-foundation/mpl-toolbox'
+import { TransactionBuilder, createSignerFromKeypair, signerIdentity } from '@metaplex-foundation/umi'
+import { createUmi } from '@metaplex-foundation/umi-bundle-defaults'
+import { fromWeb3JsInstruction, fromWeb3JsKeypair, fromWeb3JsPublicKey } from '@metaplex-foundation/umi-web3js-adapters'
+import { TOKEN_PROGRAM_ID, getOrCreateAssociatedTokenAccount } from '@solana/spl-token'
+import { Keypair, PublicKey } from '@solana/web3.js'
+import { getExplorerLink } from '@solana-developers/helpers'
+import { task } from 'hardhat/config'
+
+import { EndpointId } from '@layerzerolabs/lz-definitions'
+import { OftTools } from '@layerzerolabs/lz-solana-sdk-v2'
+
+import { createSolanaConnectionFactory } from '../common/utils'
+import getFee from '../utils/getFee'
+
+interface Args {
+    amount: number
+    mint: PublicKey
+    to: PublicKey
+    eid: EndpointId
+    programId: string
+}
+
+// Define a Hardhat task for minting tokens on Solana using the OFT pass-through
+task('lz:oft:solana:mint', 'Mint tokens on Solana using OFT pass-through')
+    .addParam('amount', 'The amount of tokens to send')
+    .addParam('mint', 'The OFT token mint public key')
+    .addParam('to', 'The recipient address on Solana')
+    .addParam('eid', 'The source endpoint ID')
+    .addParam('programId', 'The OFT program ID')
+    .setAction(async (taskArgs: Args) => {
+        const privateKey = process.env.SOLANA_PRIVATE_KEY
+        assert(!!privateKey, 'SOLANA_PRIVATE_KEY is not defined in the environment variables.')
+
+        const keypair = Keypair.fromSecretKey(bs58.decode(privateKey))
+        const umiKeypair = fromWeb3JsKeypair(keypair)
+
+        const connectionFactory = createSolanaConnectionFactory()
+        const connection = await connectionFactory(taskArgs.eid)
+
+        // Initialize Solana connection and UMI framework
+        const umi = createUmi(connection.rpcEndpoint).use(mplToolbox())
+        const umiWalletSigner = createSignerFromKeypair(umi, umiKeypair)
+        umi.use(signerIdentity(umiWalletSigner))
+
+        // Define OFT program and token mint public keys
+        const oftProgramId = new PublicKey(taskArgs.programId)
+        const mintPublicKey = new PublicKey(taskArgs.mint)
+        const toPublicKey = new PublicKey(taskArgs.to)
+        const umiMintPublicKey = fromWeb3JsPublicKey(mintPublicKey)
+
+        const web3TokenAccount = await getOrCreateAssociatedTokenAccount(
+            connection,
+            keypair,
+            mintPublicKey,
+            toPublicKey,
+            undefined,
+            'finalized'
+        )
+
+        // Fetch token metadata
+        const mintInfo = (await fetchDigitalAsset(umi, umiMintPublicKey)).mint
+        const amount = taskArgs.amount * 10 ** mintInfo.decimals
+
+        const oftMintIx = await OftTools.createMintToIx(
+            keypair.publicKey,
+            mintPublicKey,
+            web3TokenAccount.address, // which account to mint to?
+            BigInt(amount),
+            TOKEN_PROGRAM_ID,
+            oftProgramId
+        )
+
+        // Convert the instruction and create the transaction builder
+        const convertedInstruction = fromWeb3JsInstruction(oftMintIx)
+        const transactionBuilder = new TransactionBuilder([
+            {
+                instruction: convertedInstruction,
+                signers: [umiWalletSigner],
+                bytesCreatedOnChain: 0,
+            },
+        ])
+
+        // Fetch simulation compute units and set compute unit price
+        const { averageFeeExcludingZeros } = await getFee()
+        const priorityFee = Math.round(averageFeeExcludingZeros)
+        const computeUnitPrice = BigInt(priorityFee)
+        console.log(`Compute unit price: ${computeUnitPrice}`)
+
+        // Build and send the transaction
+        const transactionSignature = await transactionBuilder
+            .add(setComputeUnitPrice(umi, { microLamports: computeUnitPrice * BigInt(4) }))
+            .sendAndConfirm(umi)
+
+        // Encode the transaction signature and generate explorer links
+        const transactionSignatureBase58 = bs58.encode(transactionSignature.signature)
+        const solanaTxLink = getExplorerLink('tx', transactionSignatureBase58.toString(), 'mainnet-beta')
+
+        console.log(`✅ Minted ${taskArgs.amount} token(s) to: ${web3TokenAccount.address}!`)
+        console.log(`View Solana transaction here: ${solanaTxLink}`)
+    })