/
payloads.go
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/
payloads.go
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// Copyright 2021 Optakt Labs OÜ
//
// Licensed under the Apache License, Version 2.0 (the "License"); you may not
// use this file except in compliance with the License. You may obtain a copy of
// the License at
//
// https://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
// WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
// License for the specific language governing permissions and limitations under
// the License.
package rosetta
import (
"github.com/labstack/echo/v4"
"github.com/optakt/flow-dps/rosetta/identifier"
"github.com/optakt/flow-dps/rosetta/object"
"github.com/optakt/flow-dps/rosetta/request"
"github.com/optakt/flow-dps/rosetta/response"
)
// Payloads implements the /construction/payloads endpoint of the Rosetta Construction API.
// It receives an array of operations and all other relevant information required to construct
// an unsigned transaction. Operations must deterministically describe the intent of the
// transaction. Besides the unsigned transaction text, this endpoint also returns the list
// of payloads that should be signed.
// See https://www.rosetta-api.org/docs/ConstructionApi.html#constructionpayloads
func (c *Construction) Payloads(ctx echo.Context) error {
var req request.Payloads
err := ctx.Bind(&req)
if err != nil {
return unpackError(err)
}
err = c.validate.Request(req)
if err != nil {
return formatError(err)
}
// Metadata object is the response from our metadata endpoint. Thus, the object
// should be okay, but let's validate it anyway.
err = c.validate.CompleteBlockID(req.Metadata.CurrentBlockID)
if err != nil {
return formatError(err)
}
intent, err := c.transact.DeriveIntent(req.Operations)
if err != nil {
return apiError(intentDetermination, err)
}
unsigned, err := c.transact.CompileTransaction(req.Metadata.CurrentBlockID, intent, req.Metadata.SequenceNumber)
if err != nil {
return apiError(txConstruction, err)
}
sender := identifier.Account{
Address: intent.From.String(),
}
algo, hash, err := c.transact.HashPayload(req.Metadata.CurrentBlockID, unsigned, sender)
if err != nil {
return apiError(payloadHashing, err)
}
// We only support a single signer at the moment, so the account only needs to sign the transaction envelope.
res := response.Payloads{
Transaction: unsigned,
Payloads: []object.SigningPayload{
{
AccountID: identifier.Account{Address: intent.From.Hex()},
HexBytes: hash,
SignatureType: algo,
},
},
}
return ctx.JSON(statusOK, res)
}