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URLhint support for URLs longer than 32 bytes

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This commit is contained in:
zsfelfoldi
2015-04-17 13:46:38 +02:00
committed by zelig
parent b6fe9e0c83
commit 929428d602
3 changed files with 72 additions and 24 deletions
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60
common/resolver/resolver.go
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@ -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 {
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))
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)
copy(data[0:32], key[0:32])
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)
}