e19d435157
This removes GetScriptClass consensus calls in favour of using script type identification functions defined in the blockchain package.
77 lines
2.3 KiB
Go
77 lines
2.3 KiB
Go
// Copyright (c) 2020 The Decred developers
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// Use of this source code is governed by an ISC
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// license that can be found in the LICENSE file.
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package stake
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import (
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"github.com/decred/dcrd/txscript/v3"
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)
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// isScriptHashScript returns whether or not the passed script is a
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// pay-to-script-hash script per consensus rules.
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func isScriptHashScript(script []byte) bool {
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// A pay-to-script-hash script is of the form:
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// OP_HASH160 <20-byte scripthash> OP_EQUAL
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return len(script) == 23 &&
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script[0] == txscript.OP_HASH160 &&
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script[1] == txscript.OP_DATA_20 &&
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script[22] == txscript.OP_EQUAL
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}
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// isPubKeyHashScript returns whether or not the passed script is
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// a pay-to-pubkey-hash script per consensus rules.
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func isPubKeyHashScript(script []byte) bool {
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// A pay-to-pubkey-hash script is of the form:
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// OP_DUP OP_HASH160 <20-byte hash> OP_EQUALVERIFY OP_CHECKSIG
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return len(script) == 25 &&
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script[0] == txscript.OP_DUP &&
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script[1] == txscript.OP_HASH160 &&
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script[2] == txscript.OP_DATA_20 &&
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script[23] == txscript.OP_EQUALVERIFY &&
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script[24] == txscript.OP_CHECKSIG
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}
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// isTaggedScript checks if the provided script is tagged by the
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// provided op code.
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func isTaggedScript(version uint16, script []byte, op int) bool {
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// The only supported version is 0.
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if version != 0 {
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return false
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}
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if len(script) < 1 {
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return false
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}
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// A stake script pay-to-script-hash is of the form:
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// <opcode> <P2PKH or P2SH script>
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if int(script[0]) != op {
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return false
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}
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return isPubKeyHashScript(script[1:]) || isScriptHashScript(script[1:])
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}
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// IsTicketPurchaseScript checks if the provided script is a ticket purchase
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// script.
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func IsTicketPurchaseScript(version uint16, script []byte) bool {
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return isTaggedScript(version, script, txscript.OP_SSTX)
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}
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// IsRevocationScript checks if the provided script is a ticket revocation
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// script.
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func IsRevocationScript(version uint16, script []byte) bool {
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return isTaggedScript(version, script, txscript.OP_SSRTX)
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}
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// IsStakeChangeScript checks if the provided script is a stake change script.
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func IsStakeChangeScript(version uint16, script []byte) bool {
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return isTaggedScript(version, script, txscript.OP_SSTXCHANGE)
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}
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// IsVoteScript checks if the provided script is a vote script.
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func IsVoteScript(version uint16, script []byte) bool {
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return isTaggedScript(version, script, txscript.OP_SSGEN)
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}
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