feat: add bridger

contracts/bridgers/PolygonzkEVMBridger.vy

@@ -0,0 +1,65 @@
+# @version 0.3.10
+"""
+@title Curve Polygon zkEVM Bridge Wrapper
+"""
+from vyper.interfaces import ERC20
+
+
+CRV20: constant(address) = 0xD533a949740bb3306d119CC777fa900bA034cd52
+L1_BRIDGE: immutable(address)
+
+DESTINATION_NETWORK: immutable(uint32)
+
+
+@external
+def __init__(_l1_bridge: address, _network: uint32):
+    L1_BRIDGE = _l1_bridge
+    assert ERC20(CRV20).approve(_l1_bridge, max_value(uint256))
+
+    DESTINATION_NETWORK = _network
+
+
+@external
+def bridge(_token: ERC20, _to: address, _amount: uint256):
+    """
+    @notice Bridge a token to Polygon zkEVM using built-in PolygonZkEVMBridge
+    @param _token The token to bridge
+    @param _to The address to deposit the token to on L2
+    @param _amount The amount of the token to deposit
+    """
+    assert _token.transferFrom(msg.sender, self, _amount)
+
+    if _token.allowance(self, L1_BRIDGE) < _amount:
+        _token.approve(L1_BRIDGE, max_value(uint256))
+
+    raw_call(
+        L1_BRIDGE,
+        _abi_encode(
+            DESTINATION_NETWORK,
+            _to,
+            _amount,
+            _token.address,
+            False,
+            b"",
+            method_id=method_id("bridgeAsset(uint32,address,uint256,address,bool,bytes")
+        )
+    )
+
+
+@view
+@external
+def check(_account: address) -> bool:
+    """
+    @notice Dummy method to check if caller is allowed to bridge
+    @param _account The account to check
+    """
+    return True
+
+
+@view
+@external
+def cost() -> uint256:
+    """
+    @notice Cost in ETH to bridge
+    """
+    return 0