feat(oft-solana): create new instruction for renouncing freeze authority

[nazreen]

WARNING: do not use this code yet as it is unreviewed and unaudited

Motivation

This is for already created OFTs that were deployed with --only-oft-store true before #1141 , meaning the Freeze Authority was set to the multisig address, but the intention is to have the Freeze Authority renounced.

Changes introduced:

1. created new instruction implementation file at programs/oft/src/instructions/renounce_freeze.rs
2. updated OFT program (lib.rs) to 'register' the new instruction:

    pub fn renounce_freeze(ctx: Context<RenounceFreezeAuthority>) -> Result<()> {
        RenounceFreezeAuthority::apply(ctx)
    }

3. Added new script at tasks/solana/renounceFreeze.ts
4. Also, removed usage of program_id_from_env in programs/oft/src/lib.rs since it's not used. The removal of this enables anchor keys sync to auto-replace the program id here, thereby removing the manual step we currently require for devs to replace the program id in this file.

How to test

Init a new repo with this branch's examples

LZ_ENABLE_SOLANA_OFT_EXAMPLE=1 LAYERZERO_EXAMPLES_REPOSITORY_REF=#nazreen/oft-solana/renounce-freeze npx create-lz-oapp@latest

Build and Deploy program as usual.

To simulate previous case of Freeze Authority being set to the multisig even when in onlyOftStore mode, make the following edit in createOFT.ts:

            if (!isMABA) {
                let txBuilder = transactionBuilder()
                    .add(
                        setAuthority(umi, {
                            owned: mint.publicKey,
                            owner: umiWalletSigner,
                            newAuthority: fromWeb3JsPublicKey(mintAuthorityPublicKey),
                            authorityType: AuthorityType.MintTokens,
                        })
                    )
                    .add(
                        setAuthority(umi, {
                            owned: mint.publicKey,
                            owner: umiWalletSigner,
                            newAuthority: fromWeb3JsPublicKey(mintAuthorityPublicKey),  // <- use this instead
                            // newAuthority: onlyOftStore ? null : fromWeb3JsPublicKey(mintAuthorityPublicKey), // comment this line out
                            authorityType: AuthorityType.FreezeAccount,
                        })
                    )

Then, run the create script with --only-oft-store true

pnpm hardhat lz:oft:solana:create --eid 40168 --program-id <PROGRAM_ID> --only-oft-store true

Finally, run the new script:

npx hardhat lz:oft:solana:renounce-freeze --eid <ENDPOINT_ID> --program-id <PROGRAM_ID> --oft-store <OFT_STORE_ADDRESS> 

TODOS

• support case where admin is a multisig
• compute unit price scalar factor, use it

Next Step: updating the oft export in @layerzerolabs/oft-v2-solana-sdk

• update apps/oft/v2/solana/sdk/src/oft.ts in monorepo to support new renounce freeze instruction, allowing us to just use something like below:

import { oft } from "@layerzerolabs/oft-v2-solana-sdk";

//...
let txBuilder = transactionBuilder().add(
                oft.renounceFreeze(
          {
            payer: payer,
            programs: programsRepo,
        },
        {
            // accounts
            oftStore: oftStore,
// the rest of the accounts object

Notes:

• <MULTISIG_ADDRESS> should be mintAuthority the in OFT.json deployment file
• need web3jsKeypair to be exported from deriveConnection()

[ziming-zung]

The changes in the anchor program look good to me.

[nazreen]

Latest Commit Changes:

• Program updated to remove unnecessary mut instances and to make use of the constraint macro to validate the freeze authority
• Simplified script to not require manual passing of: token escrow, mint address, multisig address. All these can be obtained from the OFT Store account.

PR body has been updated.