94 lines
2.9 KiB
Go
94 lines
2.9 KiB
Go
// Copyright (c) 2013-2015 Conformal Systems LLC.
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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 txscript
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import (
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"github.com/btcsuite/btcd/chaincfg"
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"github.com/btcsuite/btcutil"
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)
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// ExtractPkScriptAddrs returns the type of script, addresses and required
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// signatures associated with the passed PkScript. Note that it only works for
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// 'standard' transaction script types. Any data such as public keys which are
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// invalid are omitted from the results.
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func ExtractPkScriptAddrs(pkScript []byte, chainParams *chaincfg.Params) (ScriptClass, []btcutil.Address, int, error) {
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var addrs []btcutil.Address
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var requiredSigs int
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// No valid addresses or required signatures if the script doesn't
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// parse.
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pops, err := parseScript(pkScript)
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if err != nil {
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return NonStandardTy, nil, 0, err
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}
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scriptClass := typeOfScript(pops)
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switch scriptClass {
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case PubKeyHashTy:
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// A pay-to-pubkey-hash script is of the form:
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// OP_DUP OP_HASH160 <hash> OP_EQUALVERIFY OP_CHECKSIG
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// Therefore the pubkey hash is the 3rd item on the stack.
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// Skip the pubkey hash if it's invalid for some reason.
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requiredSigs = 1
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addr, err := btcutil.NewAddressPubKeyHash(pops[2].data,
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chainParams)
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if err == nil {
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addrs = append(addrs, addr)
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}
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case PubKeyTy:
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// A pay-to-pubkey script is of the form:
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// <pubkey> OP_CHECKSIG
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// Therefore the pubkey is the first item on the stack.
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// Skip the pubkey if it's invalid for some reason.
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requiredSigs = 1
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addr, err := btcutil.NewAddressPubKey(pops[0].data, chainParams)
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if err == nil {
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addrs = append(addrs, addr)
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}
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case ScriptHashTy:
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// A pay-to-script-hash script is of the form:
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// OP_HASH160 <scripthash> OP_EQUAL
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// Therefore the script hash is the 2nd item on the stack.
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// Skip the script hash if it's invalid for some reason.
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requiredSigs = 1
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addr, err := btcutil.NewAddressScriptHashFromHash(pops[1].data,
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chainParams)
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if err == nil {
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addrs = append(addrs, addr)
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}
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case MultiSigTy:
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// A multi-signature script is of the form:
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// <numsigs> <pubkey> <pubkey> <pubkey>... <numpubkeys> OP_CHECKMULTISIG
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// Therefore the number of required signatures is the 1st item
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// on the stack and the number of public keys is the 2nd to last
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// item on the stack.
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requiredSigs = asSmallInt(pops[0].opcode)
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numPubKeys := asSmallInt(pops[len(pops)-2].opcode)
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// Extract the public keys while skipping any that are invalid.
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addrs = make([]btcutil.Address, 0, numPubKeys)
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for i := 0; i < numPubKeys; i++ {
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addr, err := btcutil.NewAddressPubKey(pops[i+1].data,
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chainParams)
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if err == nil {
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addrs = append(addrs, addr)
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}
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}
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case NullDataTy:
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// Null data transactions have no addresses or required
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// signatures.
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case NonStandardTy:
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// Don't attempt to extract addresses or required signatures for
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// nonstandard transactions.
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}
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return scriptClass, addrs, requiredSigs, nil
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}
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