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transaction_input.go
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/
transaction_input.go
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package mixin
import (
"context"
"fmt"
"sort"
"github.com/fox-one/mixin-sdk-go/v2/mixinnet"
"github.com/shopspring/decimal"
)
func (c *Client) createGhostKeys(ctx context.Context, txVer uint8, inputs []*GhostInput, senders []string) ([]*GhostKeys, error) {
// sort receivers
for _, input := range inputs {
sort.Strings(input.Receivers)
}
if txVer < mixinnet.TxVersionHashSignature {
return c.BatchReadGhostKeys(ctx, inputs)
}
return c.SafeCreateGhostKeys(ctx, inputs, senders...)
}
type TransactionBuilder struct {
*mixinnet.TransactionInput
addr *MixAddress
}
type TransactionOutput struct {
Address *MixAddress `json:"address,omitempty"`
Amount decimal.Decimal `json:"amount,omitempty"`
}
func NewLegacyTransactionBuilder(utxos []*MultisigUTXO) *TransactionBuilder {
b := &TransactionBuilder{
TransactionInput: &mixinnet.TransactionInput{
TxVersion: mixinnet.TxVersionLegacy,
Hint: newUUID(),
Inputs: make([]*mixinnet.InputUTXO, len(utxos)),
},
}
for i, utxo := range utxos {
b.Inputs[i] = &mixinnet.InputUTXO{
Input: mixinnet.Input{
Hash: &utxo.TransactionHash,
Index: uint8(utxo.OutputIndex),
},
Asset: utxo.Asset(),
Amount: utxo.Amount,
}
addr, err := NewMixAddress(utxo.Members, utxo.Threshold)
if err != nil {
panic(err)
}
if i == 0 {
b.addr = addr
} else if b.addr.String() != addr.String() {
panic("invalid utxos")
}
}
return b
}
func NewSafeTransactionBuilder(utxos []*SafeUtxo) *TransactionBuilder {
b := &TransactionBuilder{
TransactionInput: &mixinnet.TransactionInput{
TxVersion: mixinnet.TxVersion,
Hint: newUUID(),
Inputs: make([]*mixinnet.InputUTXO, len(utxos)),
},
}
for i, utxo := range utxos {
b.Inputs[i] = &mixinnet.InputUTXO{
Input: mixinnet.Input{
Hash: &utxo.TransactionHash,
Index: utxo.OutputIndex,
},
Asset: utxo.KernelAssetID,
Amount: utxo.Amount,
}
addr, err := NewMixAddress(utxo.Receivers, utxo.ReceiversThreshold)
if err != nil {
panic(err)
}
if i == 0 {
b.addr = addr
} else if b.addr.String() != addr.String() {
panic("invalid utxos")
}
}
return b
}
func (c *Client) MakeTransaction(ctx context.Context, b *TransactionBuilder, outputs []*TransactionOutput) (*mixinnet.Transaction, error) {
remain := b.TotalInputAmount()
for _, output := range outputs {
remain = remain.Sub(output.Amount)
}
if remain.IsPositive() {
outputs = append(outputs, &TransactionOutput{
Address: b.addr,
Amount: remain,
})
}
if err := c.AppendOutputsToInput(ctx, b, outputs); err != nil {
return nil, err
}
return b.Build()
}
func (c *Client) AppendOutputsToInput(ctx context.Context, b *TransactionBuilder, outputs []*TransactionOutput) error {
var (
ghostInputs []*GhostInput
ghostOutputs []*mixinnet.Output
)
for _, output := range outputs {
txOutput := &mixinnet.Output{
Type: mixinnet.OutputTypeScript,
Amount: mixinnet.IntegerFromDecimal(output.Amount),
Script: mixinnet.NewThresholdScript(output.Address.Threshold),
}
index := uint8(len(b.Outputs))
if len(output.Address.xinMembers) > 0 {
key := SafeCreateXinAddressGhostKeys(b.TxVersion, output.Address.xinMembers, index)
txOutput.Mask = key.Mask
txOutput.Keys = key.Keys
} else if len(output.Address.uuidMembers) > 0 {
ghostInputs = append(ghostInputs, &GhostInput{
Receivers: output.Address.Members(),
Index: index,
Hint: uuidHash([]byte(fmt.Sprintf("hint:%s;index:%d", b.Hint, index))),
})
ghostOutputs = append(ghostOutputs, txOutput)
}
b.Outputs = append(b.Outputs, txOutput)
}
if len(ghostInputs) > 0 {
keys, err := c.createGhostKeys(ctx, b.TxVersion, ghostInputs, b.addr.Members())
if err != nil {
return err
}
for i, key := range keys {
output := ghostOutputs[i]
output.Keys = key.Keys
output.Mask = key.Mask
}
}
return nil
}