reorg:

- statereg methods move to natspec/resolver/docserver
- fix failing test on invalid js input

common/docserver/docserver.go

@@ -14,21 +14,6 @@ var (
 	schemes = map[string]func(*DocServer) http.RoundTripper{
 		// Simple File server from local disk file:///etc/passwd :)
 		"file": fileServerOnDocRoot,
-
-		// Swarm RoundTripper for bzz scheme bzz://mydomain/contact/twitter.json
-		// "bzz": &bzz.FileServer{},
-
-		// swarm remote file system call bzzfs:///etc/passwd
-		// "bzzfs": &bzzfs.FileServer{},
-
-		// restful peer protocol RoundTripper for enode scheme:
-		// POST suggestPeer DELETE removePeer PUT switch protocols
-		// RPC - standard protocol provides arc API for self enode (very safe remote server only connects to registered enode)
-		// POST enode://ae234dfgc56b..@128.56.68.5:3456/eth/getBlock/356eac67890fe
-		// and remote peer protocol
-		// POST enode://ae234dfgc56b..@128.56.68.5:3456/eth/getBlock/356eac67890fe
-		// proxy protoocol
-
 	}
 )
 

common/natspec/natspec.go

@@ -8,6 +8,8 @@ import (
 	"strings"
 
 	"github.com/ethereum/go-ethereum/common"
+	"github.com/ethereum/go-ethereum/common/docserver"
+	"github.com/ethereum/go-ethereum/common/resolver"
 	"github.com/ethereum/go-ethereum/crypto"
 	"github.com/ethereum/go-ethereum/xeth"
 )
@@ -22,8 +24,7 @@ type NatSpec struct {
 	// abiDoc abiDoc
 }
 
-// TODO: should initialise with abi and userdoc jsons
+func New(xeth *xeth.XEth, tx string, http *docserver.DocServer) (self *NatSpec, err error) {
-func New(xeth *xeth.XEth, tx string) (self *NatSpec, err error) {
 
 	// extract contract address from tx
 
@@ -45,21 +46,26 @@ func New(xeth *xeth.XEth, tx string) (self *NatSpec, err error) {
 		return
 	}
 	codeHash := xeth.CodeAt(contractAddress)
+	// parse out host/domain
 
-	// retrieve natspec info content hash
+	// set up nameresolver with natspecreg + urlhint contract addresses
+	stateReg := NewStateReg(xeth)
+	res := resolver.New(
+		xeth,
+		stateReg.caNatSpec,
+		stateReg.caURL,
+	)
 
-	statereg := NewStateReg(xeth)
+	// resolve host via nameReg/UrlHint Resolver
-
+	uri, hash, err := res.NameToUrl(codeHash)
-	natspecHash, err1 := statereg.GetNatSpec(codeHash)
+	if err != nil {
-	if err1 != nil {
+		return
-		return nil, err1
 	}
 
-	// retrieve content
+	// get content via http client and authenticate content using hash
-
+	content, err := http.GetAuthContent(uri, hash)
-	content, err2 := statereg.GetContent(natspecHash)
+	if err != nil {
-	if err2 != nil {
+		return
-		return nil, err2
 	}
 
 	// get abi, userdoc

common/natspec/natspec_test.go

@@ -107,29 +107,23 @@ func TestMissingMethod(t *testing.T) {
 }
 
 // test invalid desc
-/*
+
 func TestInvalidDesc(t *testing.T) {
 
 	desc := "Will multiply 122 by \"7\" and return 854."
-	expected := "natspec.js error setting expression: (anonymous): Line 1:41 Unexpected number"
+	expected := "invalid character '7' after object key:value pair"
 
 	userdoc := makeUserdoc(desc)
 
-	ns, err := NewWithDocs(abi, userdoc, tx)
+	_, err := NewWithDocs(abi, userdoc, tx)
-	if err != nil {
-		t.Errorf("New: error: %v", err)
-	}
-	notice, err := ns.Notice()
-
 	if err == nil {
-		t.Errorf("expected error, got nothing (notice: '%v')", err, notice)
+		t.Errorf("expected error, got nothing", err)
 	} else {
 		if err.Error() != expected {
-			t.Errorf("expected error '%s' got '%v' (notice: '%v')", expected, err, notice)
+			t.Errorf("expected error '%s' got '%v'", expected, err)
 		}
 	}
 }
-*/
 
 // test wrong input params
 func TestWrongInputParams(t *testing.T) {

common/natspec/statereg.go

@@ -1,13 +1,7 @@
 package natspec
 
 import (
-	"encoding/binary"
-	"fmt"
-	"github.com/ethereum/go-ethereum/common"
-	"github.com/ethereum/go-ethereum/crypto"
 	"github.com/ethereum/go-ethereum/xeth"
-	"io/ioutil"
-	"net/http"
 )
 
 type StateReg struct {
@@ -48,63 +42,3 @@ func (self *StateReg) testCreateContracts() {
 	}
 
 }
-
-func (self *StateReg) GetURLhint(hash string) (url string, err error) {
-
-	url_hex := self.xeth.StorageAt(self.caURL, storageAddress(0, common.Hex2Bytes(hash)))
-	url = string(common.Hex2Bytes(url_hex))
-	l := len(url)
-	for (l > 0) && (url[l-1] == 0) {
-		l--
-	}
-	url = url[:l]
-	if l == 0 {
-		err = fmt.Errorf("GetURLhint: URL hint not found")
-	}
-	return
-
-}
-
-func storageAddress(varidx uint32, key []byte) string {
-	data := make([]byte, 64)
-	binary.BigEndian.PutUint32(data[28:32], varidx)
-	copy(data[32:64], key[0:32])
-	return common.Bytes2Hex(crypto.Sha3(data))
-}
-
-func (self *StateReg) GetNatSpec(codehash string) (hash string, err error) {
-
-	hash = self.xeth.StorageAt(self.caNatSpec, storageAddress(0, common.Hex2Bytes(codehash)))
-	return
-
-}
-
-func (self *StateReg) GetContent(hash string) (content []byte, err error) {
-
-	// get URL
-	url, err := self.GetURLhint(hash)
-	if err != nil {
-		return
-	}
-
-	// retrieve content
-	resp, err := http.Get(url)
-	defer resp.Body.Close()
-	if err != nil {
-		return
-	}
-	content, err = ioutil.ReadAll(resp.Body)
-	if err != nil {
-		return
-	}
-
-	// check hash
-
-	if common.Bytes2Hex(crypto.Sha3(content)) != hash {
-		content = nil
-		err = fmt.Errorf("GetContent error: content hash mismatch")
-	}
-
-	return
-
-}

common/resolver/resolver.go

@@ -1,10 +1,12 @@
 package resolver
 
 import (
+	"encoding/binary"
 	"fmt"
-	"net/url"
+	// "net/url"
 
 	"github.com/ethereum/go-ethereum/common"
+	"github.com/ethereum/go-ethereum/crypto"
 	"github.com/ethereum/go-ethereum/xeth"
 )
 
@@ -12,6 +14,9 @@ import (
 Resolver implements the Ethereum DNS mapping
 NameReg : Domain Name (or Code hash of Contract) -> Content Hash
 UrlHint : Content Hash -> Url Hint
+
+The resolver is meant to be called by the roundtripper transport implementation
+of a url scheme
 */
 const (
 	urlHintContractAddress = "urlhint"
@@ -19,27 +24,53 @@ const (
 )
 
 type Resolver struct {
-	xeth *xeth.XEth
+	xeth                   *xeth.XEth
+	urlHintContractAddress string
+	nameRegContractAddress string
+}
+
+func New(_xeth *xeth.XEth, uhca, nrca string) *Resolver {
+	return &Resolver{_xeth, uhca, nrca}
 }
 
 func (self *Resolver) NameToContentHash(name string) (hash common.Hash, err error) {
 	// look up in nameReg
-	copy(hash[:], []byte(name)[:32])
+	hashbytes := self.xeth.StorageAt(self.nameRegContractAddress, storageAddress(0, common.Hex2Bytes(name)))
+	copy(hash[:], hashbytes[:32])
 	return
 }
 
-func (self *Resolver) ContentHashToUrl(hash common.Hash) (uri *url.URL, err error) {
+func (self *Resolver) ContentHashToUrl(hash common.Hash) (uri string, err error) {
 	// look up in nameReg
-	rawurl := fmt.Sprintf("bzz://%x/my/path/mycontract.sud", hash[:])
+
+	urlHex := self.xeth.StorageAt(self.urlHintContractAddress, storageAddress(0, hash.Bytes()))
+	uri = string(common.Hex2Bytes(urlHex))
+	l := len(uri)
+	for (l > 0) && (uri[l-1] == 0) {
+		l--
+	}
+	uri = uri[:l]
+	if l == 0 {
+		err = fmt.Errorf("GetURLhint: URL hint not found")
+	}
+	// rawurl := fmt.Sprintf("bzz://%x/my/path/mycontract.s	ud", hash[:])
 	// mime type?
-	return url.Parse(rawurl)
+	return
 }
 
-func (self *Resolver) NameToUrl(name string) (uri *url.URL, err error) {
+func (self *Resolver) NameToUrl(name string) (uri string, hash common.Hash, err error) {
 	// look up in urlHint
-	hash, err := self.NameToContentHash(name)
+	hash, err = self.NameToContentHash(name)
 	if err != nil {
 		return
 	}
-	return self.ContentHashToUrl(hash)
+	uri, err = self.ContentHashToUrl(hash)
+	return
+}
+
+func storageAddress(varidx uint32, key []byte) string {
+	data := make([]byte, 64)
+	binary.BigEndian.PutUint32(data[28:32], varidx)
+	copy(data[32:64], key[0:32])
+	return common.Bytes2Hex(crypto.Sha3(data))
 }