Proxy forging improvements + account flags fixes

Proxy forging recipient no longer needs a public key on the blockchain
at the point PROXY_FORGING transaction is submitted.

Proxy forging recipient is given a last-reference, if they don't have one,
when they receive their first block rewards.

Split block fees in proxy forging scenario, using same share proportion.

100% proxy sharing is now allowed.

Fixed account flags processing for accounts in genesis block.

src/main/java/org/qora/block/Block.java

@@ -1050,10 +1050,8 @@ public class Block {
 		for (Transaction transaction : transactions)
 			transaction.process();
 
-		// If fees are non-zero then add fees to generator's balance
-		BigDecimal blockFee = this.blockData.getTotalFees();
-		if (blockFee.compareTo(BigDecimal.ZERO) > 0)
-			this.generator.setConfirmedBalance(Asset.QORA, this.generator.getConfirmedBalance(Asset.QORA).add(blockFee));
+		// Give transaction fees to generator/proxy
+		rewardTransactionFees();
 
 		// Process AT fees and save AT states into repository
 		ATRepository atRepository = this.repository.getATRepository();
@@ -1102,7 +1100,7 @@ public class Block {
 		// Is generator public key actually a proxy forge key?
 		ProxyForgerData proxyForgerData = this.repository.getAccountRepository().getProxyForgeData(this.blockData.getGeneratorPublicKey());
 		if (proxyForgerData != null) {
-			// Split reward to forger and recipient;
+			// Split reward between forger and recipient
 			Account recipient = new Account(this.repository, proxyForgerData.getRecipient());
 			BigDecimal recipientShare = reward.multiply(proxyForgerData.getShare().movePointLeft(2)).setScale(8, RoundingMode.DOWN);
 			recipient.setConfirmedBalance(Asset.QORA, recipient.getConfirmedBalance(Asset.QORA).add(recipientShare));
@@ -1117,6 +1115,31 @@ public class Block {
 		this.generator.setConfirmedBalance(Asset.QORA, this.generator.getConfirmedBalance(Asset.QORA).add(reward));
 	}
 
+	protected void rewardTransactionFees() throws DataException {
+		BigDecimal blockFees = this.blockData.getTotalFees();
+
+		// No transaction fees?
+		if (blockFees.compareTo(BigDecimal.ZERO) <= 0)
+			return;
+
+		// Is generator public key actually a proxy forge key?
+		ProxyForgerData proxyForgerData = this.repository.getAccountRepository().getProxyForgeData(this.blockData.getGeneratorPublicKey());
+		if (proxyForgerData != null) {
+			// Split fees between forger and recipient
+			Account recipient = new Account(this.repository, proxyForgerData.getRecipient());
+			BigDecimal recipientShare = blockFees.multiply(proxyForgerData.getShare().movePointLeft(2)).setScale(8, RoundingMode.DOWN);
+			recipient.setConfirmedBalance(Asset.QORA, recipient.getConfirmedBalance(Asset.QORA).add(recipientShare));
+
+			Account forger = new PublicKeyAccount(this.repository, proxyForgerData.getForgerPublicKey());
+			BigDecimal forgerShare = blockFees.subtract(recipientShare);
+			forger.setConfirmedBalance(Asset.QORA, forger.getConfirmedBalance(Asset.QORA).add(forgerShare));
+			return;
+		}
+
+		// Give transaction fees to generator
+		this.generator.setConfirmedBalance(Asset.QORA, this.generator.getConfirmedBalance(Asset.QORA).add(blockFees));
+	}
+
 	/**
 	 * Removes block from blockchain undoing transactions and adding them to unconfirmed pile.
 	 * 
@@ -1145,10 +1168,8 @@ public class Block {
 		// Block rewards removed after transactions undone
 		orphanBlockRewards();
 
-		// If fees are non-zero then remove fees from generator's balance
-		BigDecimal blockFee = this.blockData.getTotalFees();
-		if (blockFee.compareTo(BigDecimal.ZERO) > 0)
-			this.generator.setConfirmedBalance(Asset.QORA, this.generator.getConfirmedBalance(Asset.QORA).subtract(blockFee));
+		// Deduct any transaction fees from generator/proxy
+		deductTransactionFees();
 
 		// Return AT fees and delete AT states from repository
 		ATRepository atRepository = this.repository.getATRepository();
@@ -1175,7 +1196,7 @@ public class Block {
 		// Is generator public key actually a proxy forge key?
 		ProxyForgerData proxyForgerData = this.repository.getAccountRepository().getProxyForgeData(this.blockData.getGeneratorPublicKey());
 		if (proxyForgerData != null) {
-			// Split reward from forger and recipient;
+			// Split reward between forger and recipient
 			Account recipient = new Account(this.repository, proxyForgerData.getRecipient());
 			BigDecimal recipientShare = reward.multiply(proxyForgerData.getShare().movePointLeft(2)).setScale(8, RoundingMode.DOWN);
 			recipient.setConfirmedBalance(Asset.QORA, recipient.getConfirmedBalance(Asset.QORA).subtract(recipientShare));
@@ -1190,6 +1211,31 @@ public class Block {
 		this.generator.setConfirmedBalance(Asset.QORA, this.generator.getConfirmedBalance(Asset.QORA).subtract(reward));
 	}
 
+	protected void deductTransactionFees() throws DataException {
+		BigDecimal blockFees = this.blockData.getTotalFees();
+
+		// No transaction fees?
+		if (blockFees.compareTo(BigDecimal.ZERO) <= 0)
+			return;
+
+		// Is generator public key actually a proxy forge key?
+		ProxyForgerData proxyForgerData = this.repository.getAccountRepository().getProxyForgeData(this.blockData.getGeneratorPublicKey());
+		if (proxyForgerData != null) {
+			// Split fees between forger and recipient
+			Account recipient = new Account(this.repository, proxyForgerData.getRecipient());
+			BigDecimal recipientShare = blockFees.multiply(proxyForgerData.getShare().movePointLeft(2)).setScale(8, RoundingMode.DOWN);
+			recipient.setConfirmedBalance(Asset.QORA, recipient.getConfirmedBalance(Asset.QORA).subtract(recipientShare));
+
+			Account forger = new PublicKeyAccount(this.repository, proxyForgerData.getForgerPublicKey());
+			BigDecimal forgerShare = blockFees.subtract(recipientShare);
+			forger.setConfirmedBalance(Asset.QORA, forger.getConfirmedBalance(Asset.QORA).subtract(forgerShare));
+			return;
+		}
+
+		// Deduct transaction fees to generator
+		this.generator.setConfirmedBalance(Asset.QORA, this.generator.getConfirmedBalance(Asset.QORA).subtract(blockFees));
+	}
+
 	protected BigDecimal getRewardAtHeight(int ourHeight) {
 		List<RewardByHeight> rewardsByHeight = BlockChain.getInstance().getBlockRewardsByHeight();
 

src/main/java/org/qora/repository/hsqldb/HSQLDBAccountRepository.java

@@ -78,7 +78,6 @@ public class HSQLDBAccountRepository implements AccountRepository {
 			if (resultSet == null)
 				return null;
 
-			// Column is NOT NULL so this should never implicitly convert to 0
 			return resultSet.getInt(1);
 		} catch (SQLException e) {
 			throw new DataException("Unable to fetch account's flags from repository", e);

src/main/java/org/qora/transaction/AccountFlagsTransaction.java

@@ -91,13 +91,17 @@ public class AccountFlagsTransaction extends Transaction {
 	@Override
 	public void process() throws DataException {
 		Account target = getTarget();
-		int previousFlags = target.getFlags();
+		Integer previousFlags = target.getFlags();
 
 		accountFlagsTransactionData.setPreviousFlags(previousFlags);
 
 		// Save this transaction with target account's previous flags value
 		this.repository.getTransactionRepository().save(accountFlagsTransactionData);
 
+		// If account doesn't have entry in database yet (e.g. genesis block) then flags are zero
+		if (previousFlags == null)
+			previousFlags = 0;
+
 		// Set account's new flags
 		int newFlags = previousFlags & accountFlagsTransactionData.getAndMask()
 				| accountFlagsTransactionData.getOrMask() ^ accountFlagsTransactionData.getXorMask();
@@ -117,7 +121,13 @@ public class AccountFlagsTransaction extends Transaction {
 		// Revert
 		Account target = getTarget();
 
-		target.setFlags(accountFlagsTransactionData.getPreviousFlags());
+		Integer previousFlags = accountFlagsTransactionData.getPreviousFlags();
+
+		// If previousFlags are null then account didn't exist before this transaction
+		if (previousFlags == null)
+			this.repository.getAccountRepository().delete(target.getAddress());
+		else
+			target.setFlags(previousFlags);
 
 		// Delete this transaction itself
 		this.repository.getTransactionRepository().delete(accountFlagsTransactionData);

src/main/java/org/qora/transaction/ProxyForgingTransaction.java

@@ -10,7 +10,6 @@ import org.qora.account.Forging;
 import org.qora.account.PublicKeyAccount;
 import org.qora.asset.Asset;
 import org.qora.crypto.Crypto;
-import org.qora.data.account.AccountData;
 import org.qora.data.account.ProxyForgerData;
 import org.qora.data.transaction.ProxyForgingTransactionData;
 import org.qora.data.transaction.TransactionData;
@@ -80,7 +79,7 @@ public class ProxyForgingTransaction extends Transaction {
 	public ValidationResult isValid() throws DataException {
 		// Check reward share given to recipient
 		if (this.proxyForgingTransactionData.getShare().compareTo(BigDecimal.ZERO) <= 0
-				|| this.proxyForgingTransactionData.getShare().compareTo(MAX_SHARE) >= 0)
+				|| this.proxyForgingTransactionData.getShare().compareTo(MAX_SHARE) > 0)
 			return ValidationResult.INVALID_FORGE_SHARE;
 
 		PublicKeyAccount creator = getCreator();
@@ -97,10 +96,12 @@ public class ProxyForgingTransaction extends Transaction {
 		if (!Crypto.isValidAddress(recipient.getAddress()))
 			return ValidationResult.INVALID_ADDRESS;
 
+		/* Not needed?
 		// Check recipient has known public key
 		AccountData recipientData = this.repository.getAccountRepository().getAccount(recipient.getAddress());
 		if (recipientData == null || recipientData.getPublicKey() == null)
 			return ValidationResult.PUBLIC_KEY_UNKNOWN;
+		*/
 
 		// Check fee is positive
 		if (proxyForgingTransactionData.getFee().compareTo(BigDecimal.ZERO) <= 0)
@@ -140,6 +141,11 @@ public class ProxyForgingTransaction extends Transaction {
 
 		// Update forger's reference
 		forger.setLastReference(proxyForgingTransactionData.getSignature());
+
+		// If proxy recipient has no last-reference then use this transaction's signature as last-reference so they can spend their block rewards
+		Account recipient = new Account(this.repository, proxyForgingTransactionData.getRecipient());
+		if (recipient.getLastReference() == null)
+			recipient.setLastReference(proxyForgingTransactionData.getSignature());
 	}
 
 	@Override
@@ -166,6 +172,11 @@ public class ProxyForgingTransaction extends Transaction {
 
 		// Update forger's reference
 		forger.setLastReference(proxyForgingTransactionData.getReference());
+
+		// If recipient didn't have a last-reference prior to this transaction then remove it
+		Account recipient = new Account(this.repository, proxyForgingTransactionData.getRecipient());
+		if (Arrays.equals(recipient.getLastReference(), proxyForgingTransactionData.getSignature()))
+			recipient.setLastReference(null);
 	}
 
 }