From c2f42e3dd34051f1455bbdcb9edb5f0c08223a9b Mon Sep 17 00:00:00 2001
From: Shawn <44221603+shaspitz@users.noreply.github.com>
Date: Fri, 29 Nov 2024 12:20:39 -0800
Subject: [PATCH] feat: support for operator specific delegators (#508)

---
 .../validator-registry/middleware/MevCommitMiddleware.sol      | 3 ++-
 .../middleware/MevCommitMiddlewareStorage.sol                  | 3 +++
 contracts/contracts/validator-registry/middleware/README.md    | 2 +-
 .../validator-registry/middleware/MevCommitMiddlewareTest.sol  | 3 ++-
 4 files changed, 8 insertions(+), 3 deletions(-)

diff --git a/contracts/contracts/validator-registry/middleware/MevCommitMiddleware.sol b/contracts/contracts/validator-registry/middleware/MevCommitMiddleware.sol
index cc3c50a..8f0b0d7 100644
--- a/contracts/contracts/validator-registry/middleware/MevCommitMiddleware.sol
+++ b/contracts/contracts/validator-registry/middleware/MevCommitMiddleware.sol
@@ -613,7 +613,8 @@ contract MevCommitMiddleware is IMevCommitMiddleware, MevCommitMiddlewareStorage
         IEntity delegator = IEntity(IVault(vault).delegator());
         if (delegator.TYPE() == _FULL_RESTAKE_DELEGATOR_TYPE) {
             revert FullRestakeDelegatorNotSupported(vault);
-        } else if (delegator.TYPE() != _NETWORK_RESTAKE_DELEGATOR_TYPE) {
+        // Only two delegator types are supported, network-restake and operator-specific.
+        } else if (delegator.TYPE() != _NETWORK_RESTAKE_DELEGATOR_TYPE && delegator.TYPE() != _OPERATOR_SPECIFIC_DELEGATOR_TYPE) {
             revert UnknownDelegatorType(vault, delegator.TYPE());
         }
 
diff --git a/contracts/contracts/validator-registry/middleware/MevCommitMiddlewareStorage.sol b/contracts/contracts/validator-registry/middleware/MevCommitMiddlewareStorage.sol
index a56f546..6fa859c 100644
--- a/contracts/contracts/validator-registry/middleware/MevCommitMiddlewareStorage.sol
+++ b/contracts/contracts/validator-registry/middleware/MevCommitMiddlewareStorage.sol
@@ -16,6 +16,9 @@ abstract contract MevCommitMiddlewareStorage {
     /// @notice Enum TYPE for Symbiotic core FullRestakeDelegator.
     uint64 internal constant _FULL_RESTAKE_DELEGATOR_TYPE = 1;
 
+    /// @notice Enum TYPE for Symbiotic core OperatorSpecificDelegator.
+    uint64 internal constant _OPERATOR_SPECIFIC_DELEGATOR_TYPE = 2;
+
     /// @notice Enum TYPE for Symbiotic core InstantSlasher.
     uint64 internal constant _INSTANT_SLASHER_TYPE = 0;
 
diff --git a/contracts/contracts/validator-registry/middleware/README.md b/contracts/contracts/validator-registry/middleware/README.md
index b0cabd4..9c910a0 100644
--- a/contracts/contracts/validator-registry/middleware/README.md
+++ b/contracts/contracts/validator-registry/middleware/README.md
@@ -16,7 +16,7 @@ For L1 validators to be *opted-in to mev-commit*, some collateral stake must be
 
 Operators for the mev-commit network are responsible for bulk registering groups of L1 validator pubkeys to an associated vault. Every registered validator is represented by restaked collateral from a single Vault and Operator. Each Vault’s total collateral can be split up to secure/represent many validators in groups**.**
 
-Our network middleware contract requires any Vault registering with the contract to have a delegator of the `NetworkRestakeDelegator` type. `FullRestakeDelegator` is disallowed due to its ability for vaults to reuse stake within the same network to multiple Operators. In other words, a single instance of `slashAmount` vault collateral can only be used to secure a single validator.
+Our network middleware contract requires any Vault registering with the contract to have a delegator of the `NetworkRestakeDelegator` type or `OperatorSpecificDelegator` type. `FullRestakeDelegator` is disallowed due to its ability for vaults to reuse stake within the same network to multiple Operators. In other words, a single instance of `slashAmount` vault collateral can only be used to secure a single validator, through a single Operator. Vaults are still able to split their slashable collateral across multiple Operators.
 
 # Steps for validator opt-in via symbiotic
 
diff --git a/contracts/test/validator-registry/middleware/MevCommitMiddlewareTest.sol b/contracts/test/validator-registry/middleware/MevCommitMiddlewareTest.sol
index 91d2e58..ef3fd65 100644
--- a/contracts/test/validator-registry/middleware/MevCommitMiddlewareTest.sol
+++ b/contracts/test/validator-registry/middleware/MevCommitMiddlewareTest.sol
@@ -583,9 +583,10 @@ contract MevCommitMiddlewareTest is Test {
         mevCommitMiddleware.registerVaults(vaults, slashAmounts);
 
         uint64 networkRestakeDelegatorType = 0;
+        uint64 operatorSpecificDelegatorType = 2;
 
         mockDelegator1.setType(networkRestakeDelegatorType);
-        mockDelegator2.setType(networkRestakeDelegatorType);
+        mockDelegator2.setType(operatorSpecificDelegatorType);
 
         vm.prank(owner);
         vm.expectRevert(