mystery block reward, sniper fee

program/src/claim.rs

@@ -0,0 +1,56 @@
+use ore_api::prelude::*;
+use steel::*;
+
+/// Claims a block reward.
+pub fn process_claim(accounts: &[AccountInfo<'_>], data: &[u8]) -> ProgramResult {
+    // Parse data.
+    let args = Claim::try_from_bytes(data)?;
+    let amount = u64::from_le_bytes(args.amount);
+
+    // Load accounts.
+    let [signer_info, miner_info, miner_rewards_info, recipient_info, mint_info, system_program, token_program, associated_token_program] =
+        accounts
+    else {
+        return Err(ProgramError::NotEnoughAccountKeys);
+    };
+    signer_info.is_signer()?;
+    let miner = miner_info
+        .as_account::<Miner>(&ore_api::ID)?
+        .assert(|m| m.authority == *signer_info.key)?;
+    let miner_rewards =
+        miner_rewards_info.as_associated_token_account(&miner_info.key, &mint_info.key)?;
+    mint_info.has_address(&MINT_ADDRESS)?.as_mint()?;
+    system_program.is_program(&system_program::ID)?;
+    token_program.is_program(&spl_token::ID)?;
+    associated_token_program.is_program(&spl_associated_token_account::ID)?;
+
+    // Load recipient.
+    if recipient_info.data_is_empty() {
+        create_associated_token_account(
+            signer_info,
+            signer_info,
+            recipient_info,
+            mint_info,
+            system_program,
+            token_program,
+            associated_token_program,
+        )?;
+    } else {
+        recipient_info.as_associated_token_account(signer_info.key, mint_info.key)?;
+    }
+
+    // Load amount.
+    let amount = miner_rewards.amount().min(amount);
+
+    // Transfer reward to recipient.
+    transfer_signed(
+        miner_info,
+        miner_rewards_info,
+        mint_info,
+        token_program,
+        amount,
+        &[MINER, miner.authority.as_ref()],
+    )?;
+
+    Ok(())
+}