charge byte fees for notes (#1649)

* charge byte fees for notes

* explicitly charge zero for permissioned calls

app-libs/stf/src/lib.rs

@@ -49,4 +49,6 @@ pub mod trusted_call;
 pub(crate) const ENCLAVE_ACCOUNT_KEY: &str = "Enclave_Account_Key";
 pub const STF_SHIELDING_FEE_AMOUNT_DIVIDER: Balance = 571; // approx 0.175%
 pub const STF_TX_FEE_UNIT_DIVIDER: Balance = 100; // 0.01 tokens
+pub const STF_BYTE_FEE_UNIT_DIVIDER: Balance = 10_000; // 0.0001 tokens per byte of certain payload
+
 pub const STF_GUESS_FEE_UNIT_DIVIDER: Balance = 10; // 0.1 tokens

app-libs/stf/src/trusted_call.rs

@@ -641,9 +641,19 @@ fn get_fee_for(tc: &TrustedCallSigned) -> Balance {
 	let one = MinimalChainSpec::one_unit(shielding_target_genesis_hash().unwrap_or_default());
 	match &tc.call {
 		TrustedCall::balance_transfer(..) => one / crate::STF_TX_FEE_UNIT_DIVIDER,
+		TrustedCall::balance_transfer_with_note(_, _, _, note) =>
+			one / crate::STF_TX_FEE_UNIT_DIVIDER
+				+ (one.saturating_mul(Balance::from(note.len() as u32)))
+					/ crate::STF_BYTE_FEE_UNIT_DIVIDER,
 		TrustedCall::balance_unshield(..) => one / crate::STF_TX_FEE_UNIT_DIVIDER * 3,
 		TrustedCall::guess_the_number(call) => crate::guess_the_number::get_fee_for(call),
-		_ => Balance::from(0u32),
+		TrustedCall::note_bloat(..) => Balance::from(0u32),
+		TrustedCall::waste_time(..) => Balance::from(0u32),
+		TrustedCall::timestamp_set(..) => Balance::from(0u32),
+		TrustedCall::balance_shield(..) => Balance::from(0u32), //will be charged on recipient, elsewhere
+		#[cfg(any(feature = "test", test))]
+		TrustedCall::balance_set_balance(..) => Balance::from(0u32),
+		_ => one / crate::STF_TX_FEE_UNIT_DIVIDER,
 	}
 }