remove staking program

program/src/close.rs

@@ -0,0 +1,46 @@
+use ore_api::state::Proof;
+use solana_program::{
+    account_info::AccountInfo, entrypoint::ProgramResult, program_error::ProgramError,
+    pubkey::Pubkey, system_program,
+};
+
+use crate::{loaders::*, utils::AccountDeserialize};
+
+/// Close closes a proof account and returns the rent to the owner. Its responsibilities include:
+/// 1. Realloc proof account size to 0.
+/// 2. Transfer lamports to the owner.
+///
+/// Safety requirements:
+/// - Deregister is a permissionless instruction and can be invoked by any singer.
+/// - Can only succeed if the provided proof acount PDA is valid (associated with the signer).
+/// - The provided system program must be valid.
+pub fn process_close<'a, 'info>(
+    _program_id: &Pubkey,
+    accounts: &'a [AccountInfo<'info>],
+    _data: &[u8],
+) -> ProgramResult {
+    // Load accounts
+    let [signer, proof_info, system_program] = accounts else {
+        return Err(ProgramError::NotEnoughAccountKeys);
+    };
+    load_signer(signer)?;
+    load_proof(proof_info, signer.key, true)?;
+    load_program(system_program, system_program::id())?;
+
+    // Validate balance is zero
+    let proof_data = proof_info.data.borrow();
+    let proof = Proof::try_from_bytes(&proof_data)?;
+    if proof.balance.gt(&0) {
+        return Err(ProgramError::InvalidAccountData);
+    }
+    drop(proof_data);
+
+    // Realloc data to zero
+    proof_info.realloc(0, true)?;
+
+    // Send lamports to signer
+    **signer.lamports.borrow_mut() += proof_info.lamports();
+    **proof_info.lamports.borrow_mut() = 0;
+
+    Ok(())
+}