111 lines
2.8 KiB
Go
111 lines
2.8 KiB
Go
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 {
|
|
xeth *xeth.XEth
|
|
caURL, caNatSpec string //contract addresses
|
|
}
|
|
|
|
func NewStateReg(_xeth *xeth.XEth) (self *StateReg) {
|
|
|
|
self.xeth = _xeth
|
|
self.testCreateContracts()
|
|
return
|
|
|
|
}
|
|
|
|
const codeURLhint = "0x33600081905550609c8060136000396000f30060003560e060020a900480632f926732" +
|
|
"14601f578063f39ec1f714603157005b602b6004356024356044565b60006000f35b603a" +
|
|
"600435607f565b8060005260206000f35b600054600160a060020a031633600160a06002" +
|
|
"0a031614606257607b565b8060016000848152602001908152602001600020819055505b" +
|
|
"5050565b60006001600083815260200190815260200160002054905091905056"
|
|
|
|
const codeNatSpec = "0x33600081905550609c8060136000396000f30060003560e060020a900480632f926732" +
|
|
"14601f578063f39ec1f714603157005b602b6004356024356044565b60006000f35b603a" +
|
|
"600435607f565b8060005260206000f35b600054600160a060020a031633600160a06002" +
|
|
"0a031614606257607b565b8060016000848152602001908152602001600020819055505b" +
|
|
"5050565b60006001600083815260200190815260200160002054905091905056"
|
|
|
|
func (self *StateReg) testCreateContracts() {
|
|
|
|
var err error
|
|
self.caURL, err = self.xeth.Transact(self.xeth.Coinbase(), "", "100000", "", self.xeth.DefaultGas().String(), codeURLhint)
|
|
if err != nil {
|
|
panic(err)
|
|
}
|
|
self.caNatSpec, err = self.xeth.Transact(self.xeth.Coinbase(), "", "100000", "", self.xeth.DefaultGas().String(), codeNatSpec)
|
|
if err != nil {
|
|
panic(err)
|
|
}
|
|
|
|
}
|
|
|
|
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
|
|
|
|
}
|