Need some guide or snippet, demo to transfer SPL token out from program's PDA account

Question

My goal is to have my own program receive any Token, store in one of PDAs of program. Then transfer they out to end user wallet.

Currently I successfully send token to program's PDA, but still not able to transfer token out. What I have try is following this guide: https://www.quicknode.com/guides/solana-development/anchor/transfer-tokens but it turn out that this guide just send token from one source account to destination, have nothing to do with program's PDA.

Can anyone share some proper guide or snippet, demo?

Thanks

Answer 1

with Anchor 0.29.0 you can use the TransferChecked Struct and transfer_checked fn that will do the invoke_signed under the hood. And send the specific token and amount that you want.

Example:

    let accounts = TransferChecked {
        from: self.pda.to_account_info(),
        to: self.owner_ata.to_account_info(),
        authority: self.pda.to_account_info(),
        mint: self.mint.to_account_info()
    };

    let seeds = &[
        &b"yourseeds"[..],
    ];

    let signer_seeds = &[&seeds[..]];

    let ctx = CpiContext::new_with_signer(
        self.token_program.to_account_info(),
        accounts,
        signer_seeds
    );

    transfer_checked(ctx, amount, self.mint.decimals)

Make sure you are importing:

    use anchor_spl::token_interface::{TransferChecked, transfer_checked};

Answer 2

To transfer out of a pda you'd basically have to something like:

let bump = *ctx.bumps.get("pda").unwrap();
let signer: &[&[&[u8]]] = &[&[constants::PDA_SEED, staker.as_ref(), &[bump]]];

transfer(
  CpiContext::new_with_signer(
    ctx.accounts.token_program.to_account_info(),
      Transfer {
        from: ctx.accounts.pda.to_account_info(),
        to: ctx.accounts.token_account.to_account_info(),
        authority: ctx.accounts.pda.to_account_info(),
       },
       signer,
    ),
  ctx.accounts.pda.amount, // Transfer all tokens from pda
)?;

This grabs the pda's seed and bump and uses it to sign the transfer out. This is written with anchor and transfer the full token amount to whatever account you put as token_account.