From a18b5c093c3f46e38d9577ee5f5e46443b72c804 Mon Sep 17 00:00:00 2001
From: nolash <dev@holbrook.no>
Date: Sat, 23 Oct 2021 18:57:45 +0200
Subject: [PATCH] Reinstate simple token index contract

---
 .../data/TokenUniqueSymbolIndex.bin           |  2 +-
 .../data/TokenUniqueSymbolIndex.json          |  2 +-
 solidity/TokenUniqueSymbolIndex.sol           | 19 ++++++++++++++++++-
 3 files changed, 20 insertions(+), 3 deletions(-)

diff --git a/python/eth_token_index/data/TokenUniqueSymbolIndex.bin b/python/eth_token_index/data/TokenUniqueSymbolIndex.bin
index 2bc51d8..54c92bc 100644
--- a/python/eth_token_index/data/TokenUniqueSymbolIndex.bin
+++ b/python/eth_token_index/data/TokenUniqueSymbolIndex.bin
@@ -1 +1 @@
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diff --git a/python/eth_token_index/data/TokenUniqueSymbolIndex.json b/python/eth_token_index/data/TokenUniqueSymbolIndex.json
index 04e3a00..5993439 100644
--- a/python/eth_token_index/data/TokenUniqueSymbolIndex.json
+++ b/python/eth_token_index/data/TokenUniqueSymbolIndex.json
@@ -1 +1 @@
-[{"inputs":[],"stateMutability":"nonpayable","type":"constructor"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"addedAccount","type":"address"},{"indexed":true,"internalType":"uint256","name":"accountIndex","type":"uint256"}],"name":"AddressAdded","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"previousOwner","type":"address"},{"indexed":true,"internalType":"address","name":"newOwner","type":"address"}],"name":"OwnershipTransferred","type":"event"},{"inputs":[],"name":"acceptOwnership","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"_token","type":"address"}],"name":"add","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"bytes32","name":"_key","type":"bytes32"}],"name":"addressOf","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"_idx","type":"uint256"}],"name":"entry","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"entryCount","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"owner","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"_token","type":"address"}],"name":"register","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"bytes32","name":"","type":"bytes32"}],"name":"registry","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"bytes4","name":"_sum","type":"bytes4"}],"name":"supportsInterface","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"pure","type":"function"},{"inputs":[{"internalType":"address","name":"_newOwner","type":"address"}],"name":"transferOwnership","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"nonpayable","type":"function"}]
+[{"inputs":[],"stateMutability":"nonpayable","type":"constructor"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"addedAccount","type":"address"},{"indexed":true,"internalType":"uint256","name":"accountIndex","type":"uint256"}],"name":"AddressAdded","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"previousOwner","type":"address"},{"indexed":true,"internalType":"address","name":"newOwner","type":"address"}],"name":"OwnershipTransferred","type":"event"},{"inputs":[],"name":"acceptOwnership","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"_token","type":"address"}],"name":"add","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"_writer","type":"address"}],"name":"addWriter","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"bytes32","name":"_key","type":"bytes32"}],"name":"addressOf","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"_writer","type":"address"}],"name":"deleteWriter","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"_idx","type":"uint256"}],"name":"entry","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"entryCount","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"owner","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"_token","type":"address"}],"name":"register","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"bytes32","name":"","type":"bytes32"}],"name":"registry","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"bytes4","name":"_sum","type":"bytes4"}],"name":"supportsInterface","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"pure","type":"function"},{"inputs":[{"internalType":"address","name":"_newOwner","type":"address"}],"name":"transferOwnership","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"nonpayable","type":"function"}]
diff --git a/solidity/TokenUniqueSymbolIndex.sol b/solidity/TokenUniqueSymbolIndex.sol
index fc208c2..bea011f 100644
--- a/solidity/TokenUniqueSymbolIndex.sol
+++ b/solidity/TokenUniqueSymbolIndex.sol
@@ -7,6 +7,7 @@ contract TokenUniqueSymbolIndex {
 	// EIP 173
 	address public owner;
 	address newOwner;
+	mapping(address => bool) writers;
 
 	mapping ( bytes32 => uint256 ) public registry;
 	address[] tokens;
@@ -33,7 +34,7 @@ contract TokenUniqueSymbolIndex {
 	}
 
 	function register(address _token) public returns (bool) {
-		require(msg.sender == owner);
+		require(writers[msg.sender]);
 
 		bytes memory token_symbol;
 		bytes32 token_symbol_key;
@@ -82,6 +83,19 @@ contract TokenUniqueSymbolIndex {
 		emit OwnershipTransferred(oldOwner, owner);
 	}
 
+	// Implements Writer
+	function addWriter(address _writer) public returns (bool) {
+		require(owner == msg.sender);
+		writers[_writer] = true;
+		return true;
+	}
+
+	// Implements Writer
+	function deleteWriter(address _writer) public returns (bool) {
+		require(owner == msg.sender);
+		delete writers[_writer];
+		return true;
+	}
 
 	// Implements EIP165
 	function supportsInterface(bytes4 _sum) public pure returns (bool) {
@@ -100,6 +114,9 @@ contract TokenUniqueSymbolIndex {
 		if (_sum == 0x37a47be4) { // OwnedAccepter
 			return true;
 		}
+		if (_sum == 0x80c84bd6) { // Writer
+			return true;
+		}
 		return false;
 	}
 }