URLhint support for URLs longer than 32 bytes

common/natspec/natspec_e2e_test.go

@@ -38,10 +38,12 @@ const (
 	testBalance = "1000000000000"
 )
 
+const testFileName = "long_file_name_for_testing_registration_of_URLs_longer_than_32_bytes.content"
+
 const testNotice = "Register key `utils.toHex(_key)` <- content `utils.toHex(_content)`"
 const testExpNotice = "Register key 0xadd1a7d961cff0242089674ec2ef6fca671ab15e1fe80e38859fc815b98d88ab <- content 0xc00d5bcc872e17813df6ec5c646bb281a6e2d3b454c2c400c78192adf3344af9"
 const testExpNotice2 = `About to submit transaction (NatSpec notice error "abi key %!x(MISSING) does not match any method %!v(MISSING)"): {"id":6,"jsonrpc":"2.0","method":"eth_transact","params":[{"from":"0xe273f01c99144c438695e10f24926dc1f9fbf62d","to":"0xb737b91f8e95cf756766fc7c62c9a8ff58470381","value":"100000000000","gas":"100000","gasPrice":"100000","data":"0x31e12c20"}]}`
-const testExpNotice3 = `About to submit transaction (no NatSpec info found for contract): {"id":6,"jsonrpc":"2.0","method":"eth_transact","params":[{"from":"0xe273f01c99144c438695e10f24926dc1f9fbf62d","to":"0x8b839ad85686967a4f418eccc81962eaee314ac3","value":"100000000000","gas":"100000","gasPrice":"100000","data":"0xd66d6c10c00d5bcc872e17813df6ec5c646bb281a6e2d3b454c2c400c78192adf3344af900000000000000000000000066696c653a2f2f2f746573742e636f6e74656e74"}]}`
+const testExpNotice3 = `About to submit transaction (no NatSpec info found for contract): {"id":6,"jsonrpc":"2.0","method":"eth_transact","params":[{"from":"0xe273f01c99144c438695e10f24926dc1f9fbf62d","to":"0x8b839ad85686967a4f418eccc81962eaee314ac3","value":"100000000000","gas":"100000","gasPrice":"100000","data":"0x300a3bbfc00d5bcc872e17813df6ec5c646bb281a6e2d3b454c2c400c78192adf3344af900000000000000000000000000000000000000000000000000000000000000010000000000000000000000000000000000000000000000000000000000000000"}]}`
 
 const testUserDoc = `
 {
@@ -244,8 +246,24 @@ func (self *testFrontend) applyTxs() {
 
 func (self *testFrontend) registerURL(hash common.Hash, url string) {
 	hashHex := common.Bytes2Hex(hash[:])
-	urlHex := common.Bytes2Hex([]byte(url))
-	self.insertTx(self.coinbase, resolver.URLHintContractAddress, "register(uint256,uint256)", []string{hashHex, urlHex})
+	urlBytes := []byte(url)
+	var bb bool = true
+	var cnt byte
+	for bb {
+		bb = len(urlBytes) > 0
+		urlb := urlBytes
+		if len(urlb) > 32 {
+			urlb = urlb[:32]
+		}
+		urlHex := common.Bytes2Hex(urlb)
+		self.insertTx(self.coinbase, resolver.URLHintContractAddress, "register(uint256,uint8,uint256)", []string{hashHex, common.Bytes2Hex([]byte{cnt}), urlHex})
+		if len(urlBytes) > 32 {
+			urlBytes = urlBytes[32:]
+		} else {
+			urlBytes = nil
+		}
+		cnt++
+	}
 }
 
 func (self *testFrontend) setOwner() {
@@ -280,7 +298,7 @@ func TestNatspecE2E(t *testing.T) {
 	t.Logf("HashReg contract registered at %v", resolver.HashRegContractAddress)
 	tf.applyTxs()
 
-	ioutil.WriteFile("/tmp/test.content", []byte(testDocs), os.ModePerm)
+	ioutil.WriteFile("/tmp/"+testFileName, []byte(testDocs), os.ModePerm)
 	dochash := common.BytesToHash(crypto.Sha3([]byte(testDocs)))
 
 	codehex := tf.xeth.CodeAt(resolver.HashRegContractAddress)
@@ -288,7 +306,7 @@ func TestNatspecE2E(t *testing.T) {
 
 	tf.setOwner()
 	tf.registerNatSpec(codehash, dochash)
-	tf.registerURL(dochash, "file:///test.content")
+	tf.registerURL(dochash, "file:///"+testFileName)
 	tf.applyTxs()
 
 	chash, err := tf.testResolver().KeyToContentHash(codehash)

common/resolver/contracts.go

@@ -1,17 +1,17 @@
 package resolver
 
 const ( // built-in contracts address and code
-	ContractCodeURLhint = "0x60b180600c6000396000f30060003560e060020a90048063d66d6c1014601557005b60216004356024356027565b60006000f35b6000600083815260200190815260200160002054600160a060020a0316600014806075575033600160a060020a03166000600084815260200190815260200160002054600160a060020a0316145b607c5760ad565b3360006000848152602001908152602001600020819055508060016000848152602001908152602001600020819055505b505056"
+	ContractCodeURLhint = "0x60c180600c6000396000f30060003560e060020a90048063300a3bbf14601557005b6024600435602435604435602a565b60006000f35b6000600084815260200190815260200160002054600160a060020a0316600014806078575033600160a060020a03166000600085815260200190815260200160002054600160a060020a0316145b607f5760bc565b336000600085815260200190815260200160002081905550806001600085815260200190815260200160002083610100811060b657005b01819055505b50505056"
 	/*
 		contract URLhint {
-			function register(uint256 _hash, uint256 _url) {
+			function register(uint256 _hash, uint8 idx, uint256 _url) {
 				if (owner[_hash] == 0 || owner[_hash] == msg.sender) {
 					owner[_hash] = msg.sender;
-					url[_hash] = _url;
+					url[_hash][idx] = _url;
 				}
 			}
 			mapping (uint256 => address) owner;
-			mapping (uint256 => uint256) url;
+			mapping (uint256 => uint256[256]) url;
 		}
 	*/
 

common/resolver/resolver.go

@@ -52,7 +52,7 @@ func New(eth Backend, uhca, nrca string) *Resolver {
 
 func (self *Resolver) KeyToContentHash(khash common.Hash) (chash common.Hash, err error) {
 	// look up in hashReg
-	key := storageAddress(1, khash[:])
+	key := storageAddress(storageMapping(storageIdx2Addr(1), khash[:]))
 	hash := self.backend.StorageAt("0x"+self.hashRegContractAddress, key)
 
 	if hash == "0x0" || len(hash) < 3 {
@@ -66,16 +66,23 @@ func (self *Resolver) KeyToContentHash(khash common.Hash) (chash common.Hash, er
 
 func (self *Resolver) ContentHashToUrl(chash common.Hash) (uri string, err error) {
 	// look up in URL reg
-	key := storageAddress(1, chash[:])
-	hex := self.backend.StorageAt("0x"+self.urlHintContractAddress, key)
-	uri = string(common.Hex2Bytes(hex[2:]))
-	l := len(uri)
-	for (l > 0) && (uri[l-1] == 0) {
-		l--
+	var str string = " "
+	var idx uint32
+	for len(str) > 0 {
+		mapaddr := storageMapping(storageIdx2Addr(1), chash[:])
+		key := storageAddress(storageFixedArray(mapaddr, storageIdx2Addr(idx)))
+		hex := self.backend.StorageAt("0x"+self.urlHintContractAddress, key)
+		str = string(common.Hex2Bytes(hex[2:]))
+		l := len(str)
+		for (l > 0) && (str[l-1] == 0) {
+			l--
+		}
+		str = str[:l]
+		uri = uri + str
+		idx++
 	}
-	uri = uri[:l]
 
-	if l == 0 {
+	if len(uri) == 0 {
 		err = fmt.Errorf("GetURLhint: URL hint not found")
 	}
 	return
@@ -91,10 +98,33 @@ func (self *Resolver) KeyToUrl(key common.Hash) (uri string, hash common.Hash, e
 	return
 }
 
-func storageAddress(varidx uint32, key []byte) string {
+func storageIdx2Addr(varidx uint32) []byte {
+	data := make([]byte, 32)
+	binary.BigEndian.PutUint32(data[28:32], varidx)
+	return data
+}
+
+func storageMapping(addr, key []byte) []byte {
 	data := make([]byte, 64)
-	binary.BigEndian.PutUint32(data[60:64], varidx)
 	copy(data[0:32], key[0:32])
-	//fmt.Printf("%x %v\n", key, common.Bytes2Hex(crypto.Sha3(data)))
-	return "0x" + common.Bytes2Hex(crypto.Sha3(data))
+	copy(data[32:64], addr[0:32])
+	return crypto.Sha3(data)
+}
+
+func storageFixedArray(addr, idx []byte) []byte {
+	var carry byte
+	for i := 31; i >= 0; i-- {
+		var b byte = addr[i] + idx[i] + carry
+		if b < addr[i] {
+			carry = 1
+		} else {
+			carry = 0
+		}
+		addr[i] = b
+	}
+	return addr
+}
+
+func storageAddress(addr []byte) string {
+	return "0x" + common.Bytes2Hex(addr)
 }