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core: move all transaction.Decode checks to separate method

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We should perform the same checks during UnmarshalJSON.
This commit is contained in:
Anna Shaleva 2020-07-30 16:34:27 +03:00
parent ead6bdb25e
commit ba08a9b6ad
1 changed files with 35 additions and 37 deletions
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72
pkg/core/transaction/transaction.go
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@ -123,50 +123,15 @@ func (t *Transaction) VerificationHash() util.Uint256 {
// transaction, which are all fields except the scripts.
func (t *Transaction) decodeHashableFields(br *io.BinReader) {
t.Version = uint8(br.ReadB())
if t.Version > 0 {
br.Err = errors.New("only version 0 is supported")
return
}
t.Nonce = br.ReadU32LE()
t.SystemFee = int64(br.ReadU64LE())
if t.SystemFee < 0 {
br.Err = errors.New("negative system fee")
return
}
t.NetworkFee = int64(br.ReadU64LE())
if t.NetworkFee < 0 {
br.Err = errors.New("negative network fee")
return
}
if t.NetworkFee+t.SystemFee < t.SystemFee {
br.Err = errors.New("too big fees: int 64 overflow")
return
}
t.ValidUntilBlock = br.ReadU32LE()
br.ReadArray(&t.Signers, MaxAttributes)
if len(t.Signers) == 0 {
br.Err = errors.New("signers array should contain sender")
return
}
for i := 0; i < len(t.Signers); i++ {
if i > 0 && t.Signers[i].Scopes == FeeOnly {
br.Err = errors.New("FeeOnly scope can be used only for sender")
return
}
for j := i + 1; j < len(t.Signers); j++ {
if t.Signers[i].Account.Equals(t.Signers[j].Account) {
br.Err = errors.New("transaction signers should be unique")
return
}
}
}
br.ReadArray(&t.Attributes, MaxAttributes-len(t.Signers))
t.Script = br.ReadVarBytes()
if br.Err == nil && len(t.Script) == 0 {
br.Err = errors.New("no script")
return
if br.Err == nil {
br.Err = t.isValid()
}
}
@ -354,5 +319,38 @@ func (t *Transaction) UnmarshalJSON(data []byte) error {
return errors.New("txid doesn't match transaction hash")
}
return t.isValid()
}
// isValid checks whether decoded/unmarshalled transaction has all fields valid.
func (t *Transaction) isValid() error {
if t.Version > 0 {
return errors.New("only version 0 is supported")
}
if t.SystemFee < 0 {
return errors.New("negative system fee")
}
if t.NetworkFee < 0 {
return errors.New("negative network fee")
}
if t.NetworkFee+t.SystemFee < t.SystemFee {
return errors.New("too big fees: int64 overflow")
}
if len(t.Signers) == 0 {
return errors.New("signers array should contain sender")
}
for i := 0; i < len(t.Signers); i++ {
if i > 0 && t.Signers[i].Scopes == FeeOnly {
return errors.New("FeeOnly scope can be used only for sender")
}
for j := i + 1; j < len(t.Signers); j++ {
if t.Signers[i].Account.Equals(t.Signers[j].Account) {
return errors.New("transaction signers should be unique")
}
}
}
if len(t.Script) == 0 {
return errors.New("no script")
}
return nil
}