Removes Snowbridge parachain directory (#3186)

Removes the `bridges/snowbridge/parachain` directory and moves
everything up to under `snowbridge` directly. We are cleaning up our
local dev env after merging our crates into the polkadot-sdk.

---------

Co-authored-by: claravanstaden <Cats 4 life!>

bridges/snowbridge/primitives/core/src/lib.rs

@@ -0,0 +1,166 @@
+// SPDX-License-Identifier: Apache-2.0
+// SPDX-FileCopyrightText: 2023 Snowfork <hello@snowfork.com>
+//! # Core
+//!
+//! Common traits and types
+#![cfg_attr(not(feature = "std"), no_std)]
+
+#[cfg(test)]
+mod tests;
+
+pub mod inbound;
+pub mod operating_mode;
+pub mod outbound;
+pub mod pricing;
+pub mod ringbuffer;
+
+pub use polkadot_parachain_primitives::primitives::{
+	Id as ParaId, IsSystem, Sibling as SiblingParaId,
+};
+pub use ringbuffer::{RingBufferMap, RingBufferMapImpl};
+pub use sp_core::U256;
+
+use codec::{Decode, Encode, MaxEncodedLen};
+use frame_support::traits::Contains;
+use hex_literal::hex;
+use scale_info::TypeInfo;
+use sp_core::H256;
+use sp_io::hashing::keccak_256;
+use sp_runtime::{traits::AccountIdConversion, RuntimeDebug};
+use sp_std::prelude::*;
+use xcm::prelude::{Junction::Parachain, Location};
+use xcm_builder::{DescribeAllTerminal, DescribeFamily, DescribeLocation, HashedDescription};
+
+/// The ID of an agent contract
+pub type AgentId = H256;
+pub use operating_mode::BasicOperatingMode;
+
+pub use pricing::{PricingParameters, Rewards};
+
+pub fn sibling_sovereign_account<T>(para_id: ParaId) -> T::AccountId
+where
+	T: frame_system::Config,
+{
+	SiblingParaId::from(para_id).into_account_truncating()
+}
+
+pub struct AllowSiblingsOnly;
+impl Contains<Location> for AllowSiblingsOnly {
+	fn contains(location: &Location) -> bool {
+		matches!(location.unpack(), (1, [Parachain(_)]))
+	}
+}
+
+pub fn gwei(x: u128) -> U256 {
+	U256::from(1_000_000_000u128).saturating_mul(x.into())
+}
+
+pub fn meth(x: u128) -> U256 {
+	U256::from(1_000_000_000_000_000u128).saturating_mul(x.into())
+}
+
+pub fn eth(x: u128) -> U256 {
+	U256::from(1_000_000_000_000_000_000u128).saturating_mul(x.into())
+}
+
+pub const ROC: u128 = 1_000_000_000_000;
+
+/// Identifier for a message channel
+#[derive(
+	Clone, Copy, Encode, Decode, PartialEq, Eq, Default, RuntimeDebug, MaxEncodedLen, TypeInfo,
+)]
+pub struct ChannelId([u8; 32]);
+
+/// Deterministically derive a ChannelId for a sibling parachain
+/// Generator: keccak256("para" + big_endian_bytes(para_id))
+///
+/// The equivalent generator on the Solidity side is in
+/// contracts/src/Types.sol:into().
+fn derive_channel_id_for_sibling(para_id: ParaId) -> ChannelId {
+	let para_id: u32 = para_id.into();
+	let para_id_bytes: [u8; 4] = para_id.to_be_bytes();
+	let prefix: [u8; 4] = *b"para";
+	let preimage: Vec<u8> = prefix.into_iter().chain(para_id_bytes).collect();
+	keccak_256(&preimage).into()
+}
+
+impl ChannelId {
+	pub const fn new(id: [u8; 32]) -> Self {
+		ChannelId(id)
+	}
+}
+
+impl From<ParaId> for ChannelId {
+	fn from(value: ParaId) -> Self {
+		derive_channel_id_for_sibling(value)
+	}
+}
+
+impl From<[u8; 32]> for ChannelId {
+	fn from(value: [u8; 32]) -> Self {
+		ChannelId(value)
+	}
+}
+
+impl From<ChannelId> for [u8; 32] {
+	fn from(value: ChannelId) -> Self {
+		value.0
+	}
+}
+
+impl<'a> From<&'a [u8; 32]> for ChannelId {
+	fn from(value: &'a [u8; 32]) -> Self {
+		ChannelId(*value)
+	}
+}
+
+impl From<H256> for ChannelId {
+	fn from(value: H256) -> Self {
+		ChannelId(value.into())
+	}
+}
+
+impl AsRef<[u8]> for ChannelId {
+	fn as_ref(&self) -> &[u8] {
+		&self.0
+	}
+}
+
+#[derive(Clone, Encode, Decode, RuntimeDebug, MaxEncodedLen, TypeInfo)]
+pub struct Channel {
+	/// ID of the agent contract deployed on Ethereum
+	pub agent_id: AgentId,
+	/// ID of the parachain who will receive or send messages using this channel
+	pub para_id: ParaId,
+}
+
+pub trait StaticLookup {
+	/// Type to lookup from.
+	type Source;
+	/// Type to lookup into.
+	type Target;
+	/// Attempt a lookup.
+	fn lookup(s: Self::Source) -> Option<Self::Target>;
+}
+
+/// Channel for high-priority governance commands
+pub const PRIMARY_GOVERNANCE_CHANNEL: ChannelId =
+	ChannelId::new(hex!("0000000000000000000000000000000000000000000000000000000000000001"));
+
+/// Channel for lower-priority governance commands
+pub const SECONDARY_GOVERNANCE_CHANNEL: ChannelId =
+	ChannelId::new(hex!("0000000000000000000000000000000000000000000000000000000000000002"));
+
+pub struct DescribeHere;
+impl DescribeLocation for DescribeHere {
+	fn describe_location(l: &Location) -> Option<Vec<u8>> {
+		match l.unpack() {
+			(0, []) => Some(Vec::<u8>::new().encode()),
+			_ => None,
+		}
+	}
+}
+
+/// Creates an AgentId from a Location. An AgentId is a unique mapping to a Agent contract on
+/// Ethereum which acts as the sovereign account for the Location.
+pub type AgentIdOf = HashedDescription<H256, (DescribeHere, DescribeFamily<DescribeAllTerminal>)>;