feat(cairo): change mailbox fee token at compile time

cairo/Makefile

@@ -0,0 +1,46 @@
+# Makefile for Hyperlane Starknet Cairo
+
+.PHONY: build clean rebuild help
+
+# Default target
+help:
+	@echo "Available targets:"
+	@echo "  build [FEE_TOKEN_ADDRESS] - Build project, optionally setting fee token first"
+	@echo "  clean                     - Clean the project with scarb"
+	@echo "  rebuild [FEE_TOKEN_ADDRESS] - Clean and build, optionally setting fee token"
+	@echo ""
+	@echo "Examples:"
+	@echo "  make build                                    # Build with current fee token"
+	@echo "  make build 0x1234567890abcdef...             # Set fee token and build"
+	@echo "  make rebuild 0x1234567890abcdef...           # Set fee token, clean and build"
+
+# Build the project (with optional fee token address as first argument)
+build:
+ifneq ($(word 2,$(MAKECMDGOALS)),)
+	@echo "Cleaning project before fee token update..."
+	scarb clean
+	@echo "Updating fee token to $(word 2,$(MAKECMDGOALS))..."
+	./feeToken $(word 2,$(MAKECMDGOALS))
+endif
+	@echo "Building project..."
+	scarb build
+
+# Clean the project
+clean:
+	@echo "Cleaning project..."
+	scarb clean
+
+# Clean and build (with optional fee token address)
+rebuild:
+	@echo "Cleaning project..."
+	scarb clean
+ifneq ($(word 2,$(MAKECMDGOALS)),)
+	@echo "Updating fee token to $(word 2,$(MAKECMDGOALS))..."
+	./feeToken $(word 2,$(MAKECMDGOALS))
+endif
+	@echo "Building project..."
+	scarb build
+
+# Prevent make from treating the address argument as a target
+%:
+	@:

cairo/crates/contracts/src/fee_token.cairo

@@ -0,0 +1,5 @@
+use starknet::ContractAddress;
+
+pub fn FEE_TOKEN() -> ContractAddress {
+    0x04718f5a0Fc34cC1AF16A1cdee98fFB20C31f5cD61D6Ab07201858f4287c938D.try_into().unwrap()
+}

cairo/crates/contracts/src/interfaces.cairo

@@ -1,12 +1,13 @@
 use alexandria_bytes::Bytes;
+use contracts::fee_token::FEE_TOKEN;
 use contracts::hooks::merkle_tree_hook::merkle_tree_hook::Tree;
 use contracts::libs::message::Message;
 use core::array::ArrayTrait;
 use starknet::ContractAddress;
 use starknet::EthAddress;
 
 pub fn ETH_ADDRESS() -> ContractAddress {
-    0x049D36570D4e46f48e99674bd3fcc84644DdD6b96F7C741B1562B82f9e004dC7.try_into().unwrap()
+    FEE_TOKEN()
 }
 
 #[derive(Serde, Drop, Debug, PartialEq)]

cairo/crates/contracts/src/lib.cairo

@@ -1,3 +1,4 @@
+pub mod fee_token;
 pub mod interfaces;
 pub mod mailbox;
 pub mod libs {

cairo/feeToken

@@ -0,0 +1,38 @@
+#!/bin/bash
+
+# Script to update the FEE_TOKEN address dynamically
+# Usage: ./feeToken 0x1234567890abcdef...
+
+if [ $# -eq 0 ]; then
+    echo "Usage: $0 <fee_token_address>"
+    echo "Example: $0 0x049d36570d4e46f48e99674bd3fcc84644ddd6b96f7c741b1562b82f9e004dc7"
+    exit 1
+fi
+
+NEW_ADDRESS="$1"
+
+# Validate the address format (basic check for 0x prefix and length)
+if [[ ! "$NEW_ADDRESS" =~ ^0x[0-9a-fA-F]{63,64}$ ]]; then
+    echo "Error: Invalid address format. Expected hex string starting with 0x"
+    exit 1
+fi
+
+FEE_TOKEN_FILE="crates/contracts/src/fee_token.cairo"
+
+if [ ! -f "$FEE_TOKEN_FILE" ]; then
+    echo "Error: Fee token file not found at $FEE_TOKEN_FILE"
+    exit 1
+fi
+
+echo "Updating FEE_TOKEN address to: $NEW_ADDRESS"
+
+# Update the fee token address in the file
+sed -i.bak "s/0x[0-9a-fA-F]\\{63,64\\}/$NEW_ADDRESS/g" "$FEE_TOKEN_FILE"
+
+if [ $? -eq 0 ]; then
+    echo "Successfully updated FEE_TOKEN address in $FEE_TOKEN_FILE"
+    rm -f "${FEE_TOKEN_FILE}.bak"  # Remove backup file
+else
+    echo "Error: Failed to update fee token address"
+    exit 1
+fi