1 files changed, 39 insertions, 0 deletions
diff --git a/contracts/ens/contract/FIFSRegistrar.sol b/contracts/ens/contract/FIFSRegistrar.sol
new file mode 100644
index 000000000..51629c2b6
--- /dev/null
+++ b/contracts/ens/contract/FIFSRegistrar.sol
@@ -0,0 +1,39 @@
+pragma solidity ^0.4.0;
+
+import './AbstractENS.sol';
+
+/**
+ * A registrar that allocates subdomains to the first person to claim them.
+ */
+contract FIFSRegistrar {
+    AbstractENS ens;
+    bytes32 rootNode;
+
+    modifier only_owner(bytes32 subnode) {
+        var node = sha3(rootNode, subnode);
+        var currentOwner = ens.owner(node);
+
+        if (currentOwner != 0 && currentOwner != msg.sender) throw;
+
+        _;
+    }
+
+    /**
+     * Constructor.
+     * @param ensAddr The address of the ENS registry.
+     * @param node The node that this registrar administers.
+     */
+    function FIFSRegistrar(AbstractENS ensAddr, bytes32 node) {
+        ens = ensAddr;
+        rootNode = node;
+    }
+
+    /**
+     * Register a name, or change the owner of an existing registration.
+     * @param subnode The hash of the label to register.
+     * @param owner The address of the new owner.
+     */
+    function register(bytes32 subnode, address owner) only_owner(subnode) {
+        ens.setSubnodeOwner(rootNode, subnode, owner);
+    }
+}