contracts/ens: Add ENS contract binding

build/update-license.go

@@ -50,6 +50,8 @@ var (
 		"crypto/sha3/", "crypto/ecies/", "logger/glog/",
 		"crypto/secp256k1/curve.go",
 		"trie/arc.go",
+		// don't license generated files
+		"contracts/ens/contract/",
 	}
 
 	// paths with this prefix are licensed as GPL. all other files are LGPL.

contracts/ens/README.md

@@ -0,0 +1,20 @@
+# Swarm ENS interface
+
+## Usage
+
+Full documentation for the Ethereum Name Service [can be found as EIP 137](https://github.com/ethereum/EIPs/issues/137).
+This package offers a simple binding that streamlines the registration arbitrary utf8 domain names to swarm content hashes.
+
+## Development
+
+The SOL file in contract subdirectory implements the ENS root registry, a simple first-in-first-served registrar for the root namespace, and a simple resolver contract; they're used in tests, and can be used to deploy these contracts for your own purposes.
+
+The solidity source code can be found at [github.com/arachnid/ens/](https://github.com/arachnid/ens/).
+
+The go bindings for ENS contracts are generated using `abigen` via the go generator:
+
+```shell
+godep go generate ./swarm/services/ens
+```
+
+see the preprocessor directives in leading comments of ens.go and ens_test.go