contracts, swarm: implement EIP-1577 (#19285)

* contracts/ens: update public resolver solidity code

* contracts/ens: update public resolver, update go bindings

* update build

* fix ens.sol

* contracts/ens: change contract interface

* contracts/ens: implement public resolver changes

* contracts/ens: added ENSRegistry contract

* contracts/ens: reinstate old contract code

* contracts/ens: update README.md

* contracts/ens: added test coverage for fallback contract

* contracts/ens: added support for fallback contract

* contracts/ens: removed unused contract code

* contracts/ens: add todo and decode multicodec stub

* add encode

* vendor: add ipfs cid libraries

* contracts/ens: cid sanity tests

* contracts/ens: more cid sanity checks

* contracts/ens: wip integration

* wip

* Revert "vendor: add ipfs cid libraries"

This reverts commit 29d9b6b294ded903a1065d96c8149119713cfd12.

* contracts/ens: removed multiformats dependencies

* contracts/ens: added decode tests

* contracts/ens: added eip spec test, minor changes to exiting tests

* contracts/ens: moved cid decoding to own file

* contracts/ens: added unit test to encode hash to content hash

* contracts/ens: removed unused code

* contracts/ens: fix ens tests to use cid decode and encode

* contracts/ens: adjust swarm multicodecs after pr merge

* contracts/ens: fix linter error

* constracts/ens: address PR comments

* cmd, contracts: make peoples lives easier

* contracts/ens: fix linter error

* contracts/ens: address PR comments

1 files changed, 79 insertions, 11 deletions

diff --git a/contracts/ens/ens.go b/contracts/ens/ens.go
index b1841ab17..6fed172dc 100644
--- a/contracts/ens/ens.go
+++ b/contracts/ens/ens.go
@@ -16,25 +16,35 @@
 
 package ens
 
-//go:generate abigen --sol contract/ENS.sol --exc contract/AbstractENS.sol:AbstractENS --pkg contract --out contract/ens.go
-//go:generate abigen --sol contract/FIFSRegistrar.sol --exc contract/AbstractENS.sol:AbstractENS --pkg contract --out contract/fifsregistrar.go
-//go:generate abigen --sol contract/PublicResolver.sol --exc contract/AbstractENS.sol:AbstractENS --pkg contract --out contract/publicresolver.go
+//go:generate abigen --sol contract/ENS.sol --pkg contract --out contract/ens.go
+//go:generate abigen --sol contract/ENSRegistry.sol --exc contract/ENS.sol:ENS --pkg contract --out contract/ensregistry.go
+//go:generate abigen --sol contract/FIFSRegistrar.sol --exc contract/ENS.sol:ENS --pkg contract --out contract/fifsregistrar.go
+//go:generate abigen --sol contract/PublicResolver.sol --exc contract/ENS.sol:ENS --pkg contract --out contract/publicresolver.go
 
 import (
+	"encoding/binary"
 	"strings"
 
 	"github.com/ethereum/go-ethereum/accounts/abi/bind"
 	"github.com/ethereum/go-ethereum/common"
 	"github.com/ethereum/go-ethereum/contracts/ens/contract"
+	"github.com/ethereum/go-ethereum/contracts/ens/fallback_contract"
 	"github.com/ethereum/go-ethereum/core/types"
 	"github.com/ethereum/go-ethereum/crypto"
 )
 
 var (
-	MainNetAddress = common.HexToAddress("0x314159265dD8dbb310642f98f50C066173C1259b")
-	TestNetAddress = common.HexToAddress("0x112234455c3a32fd11230c42e7bccd4a84e02010")
+	MainNetAddress           = common.HexToAddress("0x314159265dD8dbb310642f98f50C066173C1259b")
+	TestNetAddress           = common.HexToAddress("0x112234455c3a32fd11230c42e7bccd4a84e02010")
+	contentHash_Interface_Id [4]byte
 )
 
+const contentHash_Interface_Id_Spec = 0xbc1c58d1
+
+func init() {
+	binary.BigEndian.PutUint32(contentHash_Interface_Id[:], contentHash_Interface_Id_Spec)
+}
+
 // ENS is the swarm domain name registry and resolver
 type ENS struct {
 	*contract.ENSSession
@@ -60,7 +70,7 @@ func NewENS(transactOpts *bind.TransactOpts, contractAddr common.Address, contra
 // DeployENS deploys an instance of the ENS nameservice, with a 'first-in, first-served' root registrar.
 func DeployENS(transactOpts *bind.TransactOpts, contractBackend bind.ContractBackend) (common.Address, *ENS, error) {
 	// Deploy the ENS registry
-	ensAddr, _, _, err := contract.DeployENS(transactOpts, contractBackend)
+	ensAddr, _, _, err := contract.DeployENSRegistry(transactOpts, contractBackend)
 	if err != nil {
 		return ensAddr, nil, err
 	}
@@ -110,6 +120,21 @@ func (ens *ENS) getResolver(node [32]byte) (*contract.PublicResolverSession, err
 	}, nil
 }
 
+func (ens *ENS) getFallbackResolver(node [32]byte) (*fallback_contract.PublicResolverSession, error) {
+	resolverAddr, err := ens.Resolver(node)
+	if err != nil {
+		return nil, err
+	}
+	resolver, err := fallback_contract.NewPublicResolver(resolverAddr, ens.contractBackend)
+	if err != nil {
+		return nil, err
+	}
+	return &fallback_contract.PublicResolverSession{
+		Contract:     resolver,
+		TransactOpts: ens.TransactOpts,
+	}, nil
+}
+
 func (ens *ENS) getRegistrar(node [32]byte) (*contract.FIFSRegistrarSession, error) {
 	registrarAddr, err := ens.Owner(node)
 	if err != nil {
@@ -133,11 +158,33 @@ func (ens *ENS) Resolve(name string) (common.Hash, error) {
 	if err != nil {
 		return common.Hash{}, err
 	}
-	ret, err := resolver.Content(node)
+
+	// IMPORTANT: The old contract is deprecated. This code should be removed latest on June 1st 2019
+	supported, err := resolver.SupportsInterface(contentHash_Interface_Id)
+	if err != nil {
+		return common.Hash{}, err
+	}
+
+	if !supported {
+		resolver, err := ens.getFallbackResolver(node)
+		if err != nil {
+			return common.Hash{}, err
+		}
+		ret, err := resolver.Content(node)
+		if err != nil {
+			return common.Hash{}, err
+		}
+		return common.BytesToHash(ret[:]), nil
+	}
+
+	// END DEPRECATED CODE
+
+	contentHash, err := resolver.Contenthash(node)
 	if err != nil {
 		return common.Hash{}, err
 	}
-	return common.BytesToHash(ret[:]), nil
+
+	return extractContentHash(contentHash)
 }
 
 // Addr is a non-transactional call that returns the address associated with a name.
@@ -181,15 +228,36 @@ func (ens *ENS) Register(name string) (*types.Transaction, error) {
 }
 
 // SetContentHash sets the content hash associated with a name. Only works if the caller
-// owns the name, and the associated resolver implements a `setContent` function.
-func (ens *ENS) SetContentHash(name string, hash common.Hash) (*types.Transaction, error) {
+// owns the name, and the associated resolver implements a `setContenthash` function.
+func (ens *ENS) SetContentHash(name string, hash []byte) (*types.Transaction, error) {
 	node := EnsNode(name)
 
 	resolver, err := ens.getResolver(node)
 	if err != nil {
 		return nil, err
 	}
+
 	opts := ens.TransactOpts
 	opts.GasLimit = 200000
-	return resolver.Contract.SetContent(&opts, node, hash)
+
+	// IMPORTANT: The old contract is deprecated. This code should be removed latest on June 1st 2019
+	supported, err := resolver.SupportsInterface(contentHash_Interface_Id)
+	if err != nil {
+		return nil, err
+	}
+
+	if !supported {
+		resolver, err := ens.getFallbackResolver(node)
+		if err != nil {
+			return nil, err
+		}
+		opts := ens.TransactOpts
+		opts.GasLimit = 200000
+		var b [32]byte
+		copy(b[:], hash)
+		return resolver.Contract.SetContent(&opts, node, b)
+	}
+
+	// END DEPRECATED CODE
+	return resolver.Contract.SetContenthash(&opts, node, hash)
 }