forked from cerc-io/plugeth
111 lines
2.8 KiB
Go
111 lines
2.8 KiB
Go
package natspec
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import (
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"encoding/binary"
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"fmt"
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"github.com/ethereum/go-ethereum/common"
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"github.com/ethereum/go-ethereum/crypto"
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"github.com/ethereum/go-ethereum/xeth"
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"io/ioutil"
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"net/http"
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)
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type StateReg struct {
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xeth *xeth.XEth
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caURL, caNatSpec string //contract addresses
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}
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func NewStateReg(_xeth *xeth.XEth) (self *StateReg) {
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self.xeth = _xeth
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self.testCreateContracts()
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return
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}
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const codeURLhint = "0x33600081905550609c8060136000396000f30060003560e060020a900480632f926732" +
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"14601f578063f39ec1f714603157005b602b6004356024356044565b60006000f35b603a" +
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"600435607f565b8060005260206000f35b600054600160a060020a031633600160a06002" +
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"0a031614606257607b565b8060016000848152602001908152602001600020819055505b" +
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"5050565b60006001600083815260200190815260200160002054905091905056"
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const codeNatSpec = "0x33600081905550609c8060136000396000f30060003560e060020a900480632f926732" +
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"14601f578063f39ec1f714603157005b602b6004356024356044565b60006000f35b603a" +
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"600435607f565b8060005260206000f35b600054600160a060020a031633600160a06002" +
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"0a031614606257607b565b8060016000848152602001908152602001600020819055505b" +
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"5050565b60006001600083815260200190815260200160002054905091905056"
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func (self *StateReg) testCreateContracts() {
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var err error
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self.caURL, err = self.xeth.Transact(self.xeth.Coinbase(), "", "100000", "", self.xeth.DefaultGas().String(), codeURLhint)
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if err != nil {
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panic(err)
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}
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self.caNatSpec, err = self.xeth.Transact(self.xeth.Coinbase(), "", "100000", "", self.xeth.DefaultGas().String(), codeNatSpec)
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if err != nil {
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panic(err)
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}
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}
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func (self *StateReg) GetURLhint(hash string) (url string, err error) {
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url_hex := self.xeth.StorageAt(self.caURL, storageAddress(0, common.Hex2Bytes(hash)))
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url = string(common.Hex2Bytes(url_hex))
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l := len(url)
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for (l > 0) && (url[l-1] == 0) {
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l--
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}
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url = url[:l]
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if l == 0 {
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err = fmt.Errorf("GetURLhint: URL hint not found")
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}
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return
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}
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func storageAddress(varidx uint32, key []byte) string {
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data := make([]byte, 64)
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binary.BigEndian.PutUint32(data[28:32], varidx)
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copy(data[32:64], key[0:32])
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return common.Bytes2Hex(crypto.Sha3(data))
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}
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func (self *StateReg) GetNatSpec(codehash string) (hash string, err error) {
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hash = self.xeth.StorageAt(self.caNatSpec, storageAddress(0, common.Hex2Bytes(codehash)))
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return
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}
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func (self *StateReg) GetContent(hash string) (content []byte, err error) {
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// get URL
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url, err := self.GetURLhint(hash)
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if err != nil {
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return
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}
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// retrieve content
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resp, err := http.Get(url)
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defer resp.Body.Close()
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if err != nil {
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return
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}
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content, err = ioutil.ReadAll(resp.Body)
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if err != nil {
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return
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}
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// check hash
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if common.Bytes2Hex(crypto.Sha3(content)) != hash {
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content = nil
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err = fmt.Errorf("GetContent error: content hash mismatch")
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}
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return
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}
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