Can't get the correct signing authority for solana serum anchor implementation

harkl.js

const anchor = require("@project-serum/anchor");
const serumCmn = require("@project-serum/common");

const { TOKEN_PROGRAM_ID } = require("@solana/spl-token");

describe("harkl-tests", () => {
  // Configure the client to use the local cluster.
  anchor.setProvider(anchor.Provider.env());

  const program = anchor.workspace.Harkl;

  const MINT_TOKENS = 4200000000000000; // 42M with 8dp
  const MINT_DECIMALS = 8;

  let mint = null;
  let god = null;
  let creatorAcc = anchor.web3.Keypair.generate();
  let creatorTokenAcc = null;

  it("Sets up initial test state", async () => {
    const [_mint, _god] = await serumCmn.createMintAndVault(
      program.provider,
      new anchor.BN(MINT_TOKENS),
      undefined,
      MINT_DECIMALS
    );
    mint = _mint;
    god = _god;

    creatorTokenAcc =await serumCmn.createTokenAccount(
      program.provider,
      mint,
      creatorAcc.publicKey
    );
  });

  it("Actions an interaction", async () => {
    const INTERACTION_FEE = 200000000000000;

    // let [_authority, nonce] = await anchor.web3.PublicKey.findProgramAddress(
    //   [god.toBuffer()],
    //   program.programId
    // );
    // authority = _authority;

    console.log('*************', {
      from: god.toBase58(),
      to: creatorTokenAcc.toBase58(),
      tokenProgram: TOKEN_PROGRAM_ID.toBase58(),
      programId: program.programId.toBase58(),
    });

    await program.rpc.interaction(new anchor.BN(INTERACTION_FEE), {
      accounts: {
        from: god,
        to: creatorTokenAcc,
        owner: program.provider.wallet.publicKey,
        tokenProgram: TOKEN_PROGRAM_ID,
      },
    });
  });
});

lib.rs

//! Harkl intereaction

use anchor_lang::prelude::*;
use anchor_spl::token::{self, TokenAccount, Transfer};
use std::convert::Into;

#[program]
pub mod harkl {
    use super::*;

    pub fn interaction(ctx: Context<Interaction>, interaction_fee: u64) -> ProgramResult {
        let cpi_accounts = Transfer {
            from: ctx.accounts.from.to_account_info().clone(),
            to: ctx.accounts.to.to_account_info().clone(),
            authority: ctx.accounts.owner.clone(),
        };
        let cpi_program = ctx.accounts.token_program.clone();
        let cpi_ctx = CpiContext::new(cpi_program, cpi_accounts);
        token::transfer(cpi_ctx, interaction_fee)?;
       
        Ok(())
    }
}

#[derive(Accounts)]
pub struct Interaction<'info> {
    #[account(mut, has_one = owner)]
    from: CpiAccount<'info, TokenAccount>,
    #[account("from.mint == to.mint")]
    to: CpiAccount<'info, TokenAccount>,
    #[account(signer)]
    owner: AccountInfo<'info>,
    token_program: AccountInfo<'info>,
}

#[error]
pub enum ErrorCode {
    #[msg("The derived interaction signer does not match that which was given.")]
    InvalidInteractionSigner,
}

Hey @h4rkl, where did you find this in the anchor_spl documentation to add this validation? I've been working on a contract that issues token from the mint rather than transferring from a reserve account like in your example.

https://gist.github.com/h4rkl/700400f515ab0736fd6d9318d44b2dca#file-lib-rs-L29

Have a look through the code repo - https://github.com/project-serum/anchor/blob/3958533750c83c3e90709448c4f30ed9cce0b9b8/tests/cashiers-check/programs/cashiers-check/src/lib.rs#L99

I cloned the entire program and searched around accounts and creation in my IDE.

Sweet thanks!

Hope you're on sosol.app my dude. See you in there! :)

Thanks for posting this - has been super helpful. I'm learning Rust & Sol/anchor/serum concurrently. Quick question - why use of 'to_account_info().clone()" rather just setting to accounts? Assuming it's something with rust and ownership, which I'm still wrapping my head around.