get rid of LaneMessageVerifier (#2168) (#2764)

bridges/primitives/messages/src/source_chain.rs

@@ -16,7 +16,7 @@
 
 //! Primitives of messages module, that are used on the source chain.
 
-use crate::{InboundLaneData, LaneId, MessageNonce, OutboundLaneData, VerificationError};
+use crate::{InboundLaneData, LaneId, MessageNonce, VerificationError};
 
 use crate::UnrewardedRelayer;
 use bp_runtime::Size;
@@ -64,24 +64,6 @@ pub trait TargetHeaderChain<Payload, AccountId> {
 	) -> Result<(LaneId, InboundLaneData<AccountId>), VerificationError>;
 }
 
-/// Lane message verifier.
-///
-/// Runtime developer may implement any additional validation logic over message-lane mechanism.
-/// E.g. if lanes should have some security (e.g. you can only accept Lane1 messages from
-/// Submitter1, Lane2 messages for those who has submitted first message to this lane, disable
-/// Lane3 until some block, ...), then it may be built using this verifier.
-///
-/// Any fee requirements should also be enforced here.
-pub trait LaneMessageVerifier<Payload> {
-	/// Verify message payload and return Ok(()) if message is valid and allowed to be sent over the
-	/// lane.
-	fn verify_message(
-		lane: &LaneId,
-		outbound_data: &OutboundLaneData,
-		payload: &Payload,
-	) -> Result<(), VerificationError>;
-}
-
 /// Manages payments that are happening at the source chain during delivery confirmation
 /// transaction.
 pub trait DeliveryConfirmationPayments<AccountId> {
@@ -161,7 +143,7 @@ impl<Payload> MessagesBridge<Payload> for NoopMessagesBridge {
 	}
 }
 
-/// Structure that may be used in place of `TargetHeaderChain`, `LaneMessageVerifier` and
+/// Structure that may be used in place of `TargetHeaderChain` and
 /// `MessageDeliveryAndDispatchPayment` on chains, where outbound messages are forbidden.
 pub struct ForbidOutboundMessages;
 
@@ -183,16 +165,6 @@ impl<Payload, AccountId> TargetHeaderChain<Payload, AccountId> for ForbidOutboun
 	}
 }
 
-impl<Payload> LaneMessageVerifier<Payload> for ForbidOutboundMessages {
-	fn verify_message(
-		_lane: &LaneId,
-		_outbound_data: &OutboundLaneData,
-		_payload: &Payload,
-	) -> Result<(), VerificationError> {
-		Err(VerificationError::Other(ALL_OUTBOUND_MESSAGES_REJECTED))
-	}
-}
-
 impl<AccountId> DeliveryConfirmationPayments<AccountId> for ForbidOutboundMessages {
 	type Error = &'static str;