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transaction.go
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transaction.go
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package request
import (
"fmt"
"io"
"github.com/onflow/flow-go/engine/access/rest/models"
"github.com/onflow/flow-go/engine/access/rest/util"
"github.com/onflow/flow-go/engine/common/rpc/convert"
"github.com/onflow/flow-go/model/flow"
)
const maxAuthorizers = 100
const maxAllowedScriptArguments = 100
type Transaction flow.TransactionBody
func (t *Transaction) Parse(raw io.Reader, chain flow.Chain) error {
var tx models.TransactionsBody
err := parseBody(raw, &tx)
if err != nil {
return err
}
if tx.ProposalKey == nil {
return fmt.Errorf("proposal key not provided")
}
if tx.Script == "" {
return fmt.Errorf("script not provided")
}
if tx.Payer == "" {
return fmt.Errorf("payer not provided")
}
if len(tx.Authorizers) > maxAuthorizers {
return fmt.Errorf("too many authorizers. Maximum authorizers allowed: %d", maxAuthorizers)
}
if len(tx.Arguments) > maxAllowedScriptArguments {
return fmt.Errorf("too many arguments. Maximum arguments allowed: %d", maxAllowedScriptArguments)
}
if tx.ReferenceBlockId == "" {
return fmt.Errorf("reference block not provided")
}
if len(tx.EnvelopeSignatures) == 0 {
return fmt.Errorf("envelope signatures not provided")
}
var args Arguments
err = args.Parse(tx.Arguments)
if err != nil {
return err
}
var payer Address
err = payer.Parse(tx.Payer)
if err != nil {
return fmt.Errorf("invalid payer: %w", err)
}
auths := make([]flow.Address, len(tx.Authorizers))
for i, auth := range tx.Authorizers {
var a Address
err := a.Parse(auth)
if err != nil {
return err
}
auths[i] = a.Flow()
}
var proposal ProposalKey
err = proposal.Parse(*tx.ProposalKey)
if err != nil {
return err
}
var payloadSigs TransactionSignatures
err = payloadSigs.Parse(tx.PayloadSignatures)
if err != nil {
return err
}
var envelopeSigs TransactionSignatures
err = envelopeSigs.Parse(tx.EnvelopeSignatures)
if err != nil {
return err
}
// script comes in as a base64 encoded string, decode base64 back to a string here
script, err := util.FromBase64(tx.Script)
if err != nil {
return fmt.Errorf("invalid transaction script encoding")
}
var blockID ID
err = blockID.Parse(tx.ReferenceBlockId)
if err != nil {
return fmt.Errorf("invalid reference block ID: %w", err)
}
gasLimit, err := util.ToUint64(tx.GasLimit)
if err != nil {
return fmt.Errorf("invalid gas limit: %w", err)
}
flowTransaction := flow.TransactionBody{
ReferenceBlockID: blockID.Flow(),
Script: script,
Arguments: args.Flow(),
GasLimit: gasLimit,
ProposalKey: proposal.Flow(),
Payer: payer.Flow(),
Authorizers: auths,
PayloadSignatures: payloadSigs.Flow(),
EnvelopeSignatures: envelopeSigs.Flow(),
}
// we use the gRPC method of converting the incoming transaction to a Flow transaction since
// it sets the signer_index appropriately.
entityTransaction := convert.TransactionToMessage(flowTransaction)
flowTx, err := convert.MessageToTransaction(entityTransaction, chain)
if err != nil {
return err
}
*t = Transaction(flowTx)
return nil
}
func (t Transaction) Flow() flow.TransactionBody {
return flow.TransactionBody(t)
}