From 407add9aa594be2a5344ad941a622b6a90129fae Mon Sep 17 00:00:00 2001
From: Mohammed Sohail <sohailsameja@gmail.com>
Date: Fri, 28 Jan 2022 19:33:06 +0300
Subject: [PATCH] add: kitabu validators contract (untested)

---
 bloxberg.json                             | 161 ----------------------
 contracts/validators/KitabuValidators.sol |  93 +++++++++++++
 2 files changed, 93 insertions(+), 161 deletions(-)
 delete mode 100644 bloxberg.json
 create mode 100644 contracts/validators/KitabuValidators.sol

diff --git a/bloxberg.json b/bloxberg.json
deleted file mode 100644
index ac036a3..0000000
--- a/bloxberg.json
+++ /dev/null
@@ -1,161 +0,0 @@
-{
-  "name": "Bloxberg",
-  "engine": {
-    "authorityRound": {
-      "params": {
-        "maximumUncleCountTransition": 0,
-        "maximumUncleCount": 0,
-        "stepDuration": "5",
-        "validators": {
-          "multi": {
-            "0": {
-              "list": [
-                "0x25327e6ec0B7A0b552Fb907bD6b3726A2F3D99FE",
-                "0x92db87a17af5083b3327f35b3d77d8d4abfb0cdc",
-                "0x09e5abedae50639406df6c86d748fbaff66a6df1",
-                "0x411636d64bb7ba6e1cc3b950bec9a837f59cd46f"
-              ]
-            }
-          }
-        }
-      }
-    }
-  },
-  "params": {
-    "gasLimitBoundDivisor": "0x400",
-    "maximumExtraDataSize": "0x20",
-    "minGasLimit": "0x7A1200",
-    "networkID": "0x2325",
-
-    "eip140Transition": "0x0",
-    "eip211Transition": "0x0",
-    "eip214Transition": "0x0",
-    "eip658Transition": "0x0",
-
-    "eip145Transition": "0x0",
-    "eip1014Transition": "0x0",
-    "eip1052Transition": "0x0",
-
-    "eip1283Transition": "0x0",
-    "eip1344Transition": "0x0",
-    "eip1706Transition": "0x0",
-    "eip1884Transition": "0x0",
-    "eip2028Transition": "0x0"
-  },
-  "genesis": {
-    "seal": {
-      "authorityRound": {
-        "step": "0x0",
-        "signature": "0x0000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000"
-      }
-    },
-    "difficulty": "0x20000",
-    "gasLimit": "0x7A1200"
-  },
-  "accounts": {
-    "0x0000000000000000000000000000000000000001": {
-      "balance": "1",
-      "builtin": {
-        "name": "ecrecover",
-        "pricing": { "linear": { "base": 3000, "word": 0 } }
-      }
-    },
-    "0x0000000000000000000000000000000000000002": {
-      "balance": "1",
-      "builtin": {
-        "name": "sha256",
-        "pricing": { "linear": { "base": 60, "word": 12 } }
-      }
-    },
-    "0x0000000000000000000000000000000000000003": {
-      "balance": "1",
-      "builtin": {
-        "name": "ripemd160",
-        "pricing": { "linear": { "base": 600, "word": 120 } }
-      }
-    },
-    "0x0000000000000000000000000000000000000004": {
-      "balance": "1",
-      "builtin": {
-        "name": "identity",
-        "pricing": { "linear": { "base": 15, "word": 3 } }
-      }
-    },
-    "0x0000000000000000000000000000000000000005": {
-      "builtin": {
-        "name": "modexp",
-        "activate_at": 0,
-        "pricing": { "modexp": { "divisor": 20 } }
-      }
-    },
-    "0x0000000000000000000000000000000000000006": {
-      "builtin": {
-        "name": "alt_bn128_add",
-        "activate_at": 0,
-        "pricing": {
-          "alt_bn128_const_operations": {
-            "price": 500
-          }
-        }
-      }
-    },
-    "0000000000000000000000000000000000000007": {
-      "builtin": {
-        "name": "alt_bn128_mul",
-        "pricing": {
-          "0": {
-            "info": "Istanbul HF",
-            "price": {
-              "alt_bn128_const_operations": {
-                "price": 6000
-              }
-            }
-          }
-        }
-      }
-    },
-    "0000000000000000000000000000000000000008": {
-      "builtin": {
-        "name": "alt_bn128_pairing",
-        "pricing": {
-          "0": {
-            "info": "Istanbul HF",
-            "price": {
-              "alt_bn128_pairing": {
-                "base": 45000,
-                "pair": 34000
-              }
-            }
-          }
-        }
-      }
-    },
-    "0x0000000000000000000000000000000000000009": {
-      "builtin": {
-        "name": "blake2_f",
-        "pricing": {
-          "0": {
-            "info": "Istanbul HF",
-            "price": {
-              "blake2_f": {
-                "gas_per_round": 1
-              }
-            }
-          }
-        }
-      }
-    },
-    "0x25327e6ec0B7A0b552Fb907bD6b3726A2F3D99FE": {
-      "balance": "100000000000000000000000000000000"
-    },
-    "0x92db87a17af5083b3327f35b3d77d8d4abfb0cdc": {
-      "balance": "100000000000000000000000000000000"
-    },
-    "0x09e5abedae50639406df6c86d748fbaff66a6df1": {
-      "balance": "100000000000000000000000000000000"
-    },
-    "0x411636d64bb7ba6e1cc3b950bec9a837f59cd46f": {
-      "balance": "100000000000000000000000000000000"
-    }
-  }
-}
diff --git a/contracts/validators/KitabuValidators.sol b/contracts/validators/KitabuValidators.sol
new file mode 100644
index 0000000..e97617f
--- /dev/null
+++ b/contracts/validators/KitabuValidators.sol
@@ -0,0 +1,93 @@
+// Author: Mohamed Sohail <mohamedsohailazim@gmail.com>
+// SPDX-License-Identifier:	GPL-3.0-or-later
+
+pragma solidity >=0.6.12;
+
+contract KitabuValidators {
+    address constant SYSTEM_ADDRESS =
+        0xffffFFFfFFffffffffffffffFfFFFfffFFFfFFfE;
+    address public admissionController =
+        0x77Bea3320Fa46aFF3C7c128B83F5E436596Ba73D;
+
+    address[] public validators;
+
+    bool public finalized;
+
+    mapping(address => uint256) validatorSetIndex;
+
+    event NewAdmissionController(
+        address indexed old,
+        address indexed newController
+    );
+    event InitiateChange(bytes32 indexed parentHash, address[] newSet);
+    event ChangeFinalized(address[] currentSet);
+
+    modifier onlySystemChange() {
+        require(msg.sender == SYSTEM_ADDRESS);
+        _;
+    }
+
+    modifier pendingFinalization() {
+        require(finalized);
+        _;
+    }
+
+    modifier onlyAdmissionController() {
+        require(msg.sender == admissionController);
+        _;
+    }
+
+    constructor() {
+        validators.push(admissionController);
+        validatorSetIndex[admissionController] = 0;
+    }
+
+    function setNewAdmissionController(address newController)
+        public
+        onlyAdmissionController
+    {
+        emit NewAdmissionController(admissionController, newController);
+        admissionController = newController;
+    }
+
+    function getValidators() public view returns (address[] memory) {
+        return validators;
+    }
+
+    function initiateChange() private {
+        finalized = false;
+        emit InitiateChange(blockhash(block.number - 1), getValidators());
+    }
+
+    function finalizeChange() public onlySystemChange {
+        finalized = true;
+        emit ChangeFinalized(validators);
+    }
+
+    function addValidator(address newValidator)
+        public
+        onlyAdmissionController
+        pendingFinalization
+    {
+        validators.push(newValidator);
+        validatorSetIndex[newValidator] = validators.length - 1;
+        initiateChange();
+    }
+
+    function removeValidator(address exValidator)
+        public
+        onlyAdmissionController
+        pendingFinalization
+    {
+        orderedRemoval(validatorSetIndex[exValidator]);
+        delete validatorSetIndex[exValidator];
+        initiateChange();
+    }
+
+    function orderedRemoval(uint256 index) private {
+        for (uint256 i = index; i < validators.length - 1; i++) {
+            validators[i] = validators[i + 1];
+        }
+        validators.pop();
+    }
+}