@@ -603,6 +603,10 @@ func SuggestedParams(ctx lib.ReqContext, w http.ResponseWriter, r *http.Request)
 	params.GenesisHash = gh[:]
 	params.LastRound = uint64(stat.LastRound)
 	params.ConsensusVersion = string(stat.LastVersion)
+
+	proto := config.Consensus[stat.LastVersion]
+	params.MinTxnFee = proto.MinTxnFee
+
 	SendJSON(TransactionParamsResponse{&params}, w, ctx.Log)
 }
 
// Copyright (C) 2019 Algorand, Inc.
// This file is part of go-algorand
//
// go-algorand is free software: you can redistribute it and/or modify
// it under the terms of the GNU Affero General Public License as
// published by the Free Software Foundation, either version 3 of the
// License, or (at your option) any later version.
//
// go-algorand is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU Affero General Public License for more details.
//
// You should have received a copy of the GNU Affero General Public License
// along with go-algorand.  If not, see <https://www.gnu.org/licenses/>.

package handlers

import (
	"errors"
	"fmt"
	"net/http"
	"strconv"
	"time"

	"github.com/gorilla/mux"

	"github.com/algorand/go-algorand/agreement"
	"github.com/algorand/go-algorand/config"
	"github.com/algorand/go-algorand/crypto"
	"github.com/algorand/go-algorand/daemon/algod/api/server/lib"
	"github.com/algorand/go-algorand/data/basics"
	"github.com/algorand/go-algorand/data/bookkeeping"
	"github.com/algorand/go-algorand/data/transactions"
	"github.com/algorand/go-algorand/ledger"
	"github.com/algorand/go-algorand/node"
	"github.com/algorand/go-algorand/protocol"
)

func nodeStatus(node node.Full) (res NodeStatus, err error) {
	stat, err := node.Status()
	if err != nil {
		return NodeStatus{}, err
	}

	return NodeStatus{
		LastRound:            uint64(stat.LastRound),
		LastVersion:          string(stat.LastVersion),
		NextVersion:          string(stat.NextVersion),
		NextVersionRound:     uint64(stat.NextVersionRound),
		NextVersionSupported: stat.NextVersionSupported,
		TimeSinceLastRound:   stat.TimeSinceLastRound().Nanoseconds(),
		CatchupTime:          stat.CatchupTime.Nanoseconds(),
	}, nil
}

func paymentTxEncode(tx transactions.Transaction, ad transactions.ApplyData) Transaction {
	payment := PaymentTransactionType{
		To:           tx.Receiver.String(),
		Amount:       tx.TxAmount().Raw,
		ToRewards:    ad.ReceiverRewards.Raw,
		CloseRewards: ad.CloseRewards.Raw,
	}

	if tx.CloseRemainderTo != (basics.Address{}) {
		payment.CloseRemainderTo = tx.CloseRemainderTo.String()
		payment.CloseAmount = ad.ClosingAmount.Raw
	}

	return Transaction{
		Type:        tx.Type,
		TxID:        tx.ID().String(),
		From:        tx.Src().String(),
		Fee:         tx.TxFee().Raw,
		FirstRound:  uint64(tx.First()),
		LastRound:   uint64(tx.Last()),
		Note:        tx.Aux(),
		Payment:     &payment,
		FromRewards: ad.SenderRewards.Raw,
		GenesisID:   tx.GenesisID,
		GenesisHash: tx.GenesisHash[:],
	}
}

func txWithStatusEncode(tr node.TxnWithStatus) Transaction {
	s := paymentTxEncode(tr.Txn.Txn, tr.ApplyData)
	s.ConfirmedRound = uint64(tr.ConfirmedRound)
	s.PoolError = tr.PoolError
	return s
}

func blockEncode(b bookkeeping.Block, c agreement.Certificate) (Block, error) {
	block := Block{
		Hash:              crypto.Digest(b.Hash()).String(),
		PreviousBlockHash: crypto.Digest(b.Branch).String(),
		Seed:              crypto.Digest(b.Seed()).String(),
		Proposer:          c.Proposal.OriginalProposer.String(),
		Round:             uint64(b.Round()),
		TransactionsRoot:  b.TxnRoot.String(),
		RewardsRate:       b.RewardsRate,
		RewardsLevel:      b.RewardsLevel,
		RewardsResidue:    b.RewardsResidue,
		Timestamp:         b.TimeStamp,

		UpgradeState: UpgradeState{
			CurrentProtocol:        string(b.CurrentProtocol),
			NextProtocol:           string(b.NextProtocol),
			NextProtocolApprovals:  b.NextProtocolApprovals,
			NextProtocolVoteBefore: uint64(b.NextProtocolVoteBefore),
			NextProtocolSwitchOn:   uint64(b.NextProtocolSwitchOn),
		},
		UpgradeVote: UpgradeVote{
			UpgradePropose: string(b.UpgradePropose),
			UpgradeApprove: b.UpgradeApprove,
		},
	}

	// Transactions
	var txns []Transaction
	payset, err := b.DecodePaysetWithAD()
	if err != nil {
		return Block{}, err
	}

	for _, txn := range payset {
		tx := node.TxnWithStatus{
			Txn:            txn.SignedTxn,
			ConfirmedRound: b.Round(),
			ApplyData:      txn.ApplyData,
		}
		txns = append(txns, txWithStatusEncode(tx))
	}

	block.Transactions = TransactionList{Transactions: txns}

	return block, nil
}

// Status is an httpHandler for route GET /v1/status
func Status(ctx lib.ReqContext, w http.ResponseWriter, r *http.Request) {
	// swagger:operation GET /v1/status GetStatus
	//---
	//     Summary: Gets the current node status.
	//     Produces:
	//     - application/json
	//     Schemes:
	//     - http
	//     Responses:
	//       200:
	//         "$ref": '#/responses/StatusResponse'
	//       500:
	//         description: Internal Error
	//         schema: {type: string}
	//       401: { description: Invalid API Token }
	//       default: { description: Unknown Error }
	nodeStatus, err := nodeStatus(ctx.Node)
	if err != nil {
		lib.ErrorResponse(w, http.StatusInternalServerError, err, errFailedRetrievingNodeStatus, ctx.Log)
		return
	}

	response := StatusResponse{&nodeStatus}
	SendJSON(response, w, ctx.Log)
}

// WaitForBlock is an httpHandler for route GET /v1/status/wait-for-block-after/{round:[0-9]+}
func WaitForBlock(ctx lib.ReqContext, w http.ResponseWriter, r *http.Request) {
	// swagger:operation GET /v1/status/wait-for-block-after/{round}/ WaitForBlock
	// ---
	//     Summary: Gets the node status after waiting for the given round.
	//     Description: Waits for a block to appear after round {round} and returns the node's status at the time.
	//     Produces:
	//     - application/json
	//     Schemes:
	//     - http
	//     Parameters:
	//       - name: round
	//         in: path
	//         type: integer
	//         format: int64
	//         minimum: 0
	//         required: true
	//         description: The round to wait until returning status
	//     Responses:
	//       200:
	//         "$ref": '#/responses/StatusResponse'
	//       400:
	//         description: Bad Request
	//         schema: {type: string}
	//       500:
	//         description: Internal Error
	//         schema: {type: string}
	//       401: { description: Invalid API Token }
	//       default: { description: Unknown Error }
	queryRound, err := strconv.ParseUint(mux.Vars(r)["round"], 10, 64)
	if err != nil {
		lib.ErrorResponse(w, http.StatusBadRequest, err, errFailedParsingRoundNumber, ctx.Log)
		return
	}

	select {
	case <-time.After(1 * time.Minute):
	case <-ctx.Node.WaitForRound(basics.Round(queryRound + 1)):
	}

	nodeStatus, err := nodeStatus(ctx.Node)
	if err != nil {
		lib.ErrorResponse(w, http.StatusInternalServerError, err, errFailedRetrievingNodeStatus, ctx.Log)
		return
	}

	response := StatusResponse{&nodeStatus}
	SendJSON(response, w, ctx.Log)
}

// RawTransaction is an httpHandler for route POST /v1/transactions
func RawTransaction(ctx lib.ReqContext, w http.ResponseWriter, r *http.Request) {
	// swagger:operation POST /v1/transactions RawTransaction
	// ---
	//     Summary: Broadcasts a raw transaction to the network.
	//     Produces:
	//     - application/json
	//     Consumes:
	//     - application/x-binary
	//     Schemes:
	//     - http
	//     Parameters:
	//       - name: rawtxn
	//         in: body
	//         schema:
	//           type: string
	//           format: binary
	//         required: true
	//         description: The byte encoded signed transaction to broadcast to network
	//     Responses:
	//       200:
	//         "$ref": "#/responses/TransactionIDResponse"
	//       400:
	//         description: Bad Request
	//         schema: {type: string}
	//       500:
	//         description: Internal Error
	//         schema: {type: string}
	//       401: { description: Invalid API Token }
	//       default: { description: Unknown Error }
	var st transactions.SignedTxn
	err := protocol.NewDecoder(r.Body).Decode(&st)
	if err != nil {
		lib.ErrorResponse(w, http.StatusBadRequest, err, err.Error(), ctx.Log)
		return
	}

	txid, err := ctx.Node.BroadcastSignedTxn(st)
	if err != nil {
		lib.ErrorResponse(w, http.StatusBadRequest, err, err.Error(), ctx.Log)
		return
	}

	SendJSON(TransactionIDResponse{&TransactionID{TxID: txid.String()}}, w, ctx.Log)
}

// AccountInformation is an httpHandler for route GET /v1/account/{addr:[A-Z0-9]{KeyLength}}
func AccountInformation(ctx lib.ReqContext, w http.ResponseWriter, r *http.Request) {
	// swagger:operation GET /v1/account/{address} AccountInformation
	// ---
	//     Summary: Get account information.
	//     Description: Given a specific account public key, this call returns the accounts status, balance and spendable amounts
	//     Produces:
	//     - application/json
	//     Schemes:
	//     - http
	//     Parameters:
	//       - name: address
	//         in: path
	//         type: string
	//         pattern: "[A-Z0-9]{58}"
	//         required: true
	//         description: An account public key
	//     Responses:
	//       200:
	//         "$ref": '#/responses/AccountInformationResponse'
	//       400:
	//         description: Bad Request
	//         schema: {type: string}
	//       500:
	//         description: Internal Error
	//         schema: {type: string}
	//       401: { description: Invalid API Token }
	//       default: { description: Unknown Error }
	queryAddr := mux.Vars(r)["addr"]

	if queryAddr == "" {
		lib.ErrorResponse(w, http.StatusBadRequest, fmt.Errorf(errNoAccountSpecified), errNoAccountSpecified, ctx.Log)
		return
	}

	addr, err := basics.UnmarshalChecksumAddress(queryAddr)
	if err != nil {
		lib.ErrorResponse(w, http.StatusBadRequest, err, errFailedToParseAddress, ctx.Log)
		return
	}

	amount, rewards, amountWithoutPendingRewards, status, round, err := ctx.Node.GetBalanceAndStatus(basics.Address(addr))

	if err != nil {
		lib.ErrorResponse(w, http.StatusInternalServerError, err, errFailedLookingUpLedger, ctx.Log)
		return
	}

	pendingRewards, overflowed := basics.OSubA(amount, amountWithoutPendingRewards)
	if overflowed {
		err = fmt.Errorf("overflowed pending rewards: %v - %v", amount, amountWithoutPendingRewards)
		lib.ErrorResponse(w, http.StatusInternalServerError, err, errInternalFailure, ctx.Log)
		return
	}

	accountInfo := Account{
		Round:                       uint64(round),
		Address:                     addr.String(),
		Amount:                      amount.Raw,
		PendingRewards:              pendingRewards.Raw,
		AmountWithoutPendingRewards: amountWithoutPendingRewards.Raw,
		Rewards:                     rewards.Raw,
		Status:                      status.String(),
	}

	SendJSON(AccountInformationResponse{&accountInfo}, w, ctx.Log)
}

// TransactionInformation is an httpHandler for route GET /v1/account/{addr:[A-Z0-9]{KeyLength}}/transaction/{txid:[A-Z0-9]+}
func TransactionInformation(ctx lib.ReqContext, w http.ResponseWriter, r *http.Request) {
	// swagger:operation GET /v1/account/{address}/transaction/{txid} TransactionInformation
	// ---
	//     Summary: Get a specific confirmed transaction.
	//     Description: >
	//       Given a wallet address and a transaction id, it returns the confirmed transaction
	//       information. This call scans up to <CurrentProtocol>.MaxTxnLife blocks in the past.
	//     Produces:
	//     - application/json
	//     Schemes:
	//     - http
	//     Parameters:
	//       - name: address
	//         in: path
	//         type: string
	//         pattern: "[A-Z0-9]{58}"
	//         required: true
	//         description: An account public key
	//       - name: txid
	//         in: path
	//         type: string
	//         pattern: "[A-Z0-9]+"
	//         required: true
	//         description: A transaction id
	//     Responses:
	//       200:
	//         "$ref": '#/responses/TransactionResponse'
	//       400:
	//         description: Bad Request
	//         schema: {type: string}
	//       404:
	//         description: Transaction Not Found
	//         schema: {type: string}
	//       401: { description: Invalid API Token }
	//       default: { description: Unknown Error }

	queryTxID := mux.Vars(r)["txid"]
	if queryTxID == "" {
		lib.ErrorResponse(w, http.StatusBadRequest, fmt.Errorf(errNoTxnSpecified), errNoTxnSpecified, ctx.Log)
		return
	}

	txID := transactions.Txid{}
	if txID.UnmarshalText([]byte(queryTxID)) != nil {
		lib.ErrorResponse(w, http.StatusBadRequest, fmt.Errorf(errNoTxnSpecified), errNoTxnSpecified, ctx.Log)
		return
	}

	queryAddr := mux.Vars(r)["addr"]
	if queryAddr == "" {
		lib.ErrorResponse(w, http.StatusBadRequest, fmt.Errorf(errNoAccountSpecified), errNoAccountSpecified, ctx.Log)
		return
	}

	addr, err := basics.UnmarshalChecksumAddress(queryAddr)
	if err != nil {
		lib.ErrorResponse(w, http.StatusBadRequest, fmt.Errorf(errFailedToParseAddress), errFailedToParseAddress, ctx.Log)
		return
	}

	latestRound := ctx.Node.LatestRound()
	stat, err := ctx.Node.Status()
	if err != nil {
		lib.ErrorResponse(w, http.StatusInternalServerError, err, errFailedRetrievingNodeStatus, ctx.Log)
		return
	}
	proto := config.Consensus[stat.LastVersion]
	// non-Archival nodes keep proto.MaxTxnLife blocks around,
	// so without the + 1 in the below calculation,
	// Node.GetTransaction will query 1 round more than is kept around
	start := latestRound - basics.Round(proto.MaxTxnLife) + 1
	if latestRound < basics.Round(proto.MaxTxnLife) {
		start = 0
	}

	if txn, ok := ctx.Node.GetTransaction(addr, txID, start, latestRound); ok {
		var responseTxs Transaction
		responseTxs = txWithStatusEncode(txn)

		response := TransactionResponse{
			Body: &responseTxs,
		}

		SendJSON(response, w, ctx.Log)
		return
	}

	// We didn't find it, return a failure
	lib.ErrorResponse(w, http.StatusNotFound, err, errTransactionNotFound, ctx.Log)
	return
}

// PendingTransactionInformation is an httpHandler for route GET /v1/transactions/pending/{txid:[A-Z0-9]+}
func PendingTransactionInformation(ctx lib.ReqContext, w http.ResponseWriter, r *http.Request) {
	// swagger:operation GET /v1/transactions/pending/{txid} PendingTransactionInformation
	// ---
	//     Summary: Get a specific pending transaction.
	//     Description: >
	//       Given a transaction id of a recently submitted transaction, it returns information
	//       about it.  There are several cases when this might succeed:
	//
	//       - transaction committed (committed round > 0)
	//       - transaction still in the pool (committed round = 0, pool error = "")
	//       - transaction removed from pool due to error (committed round = 0, pool error != "")
	//
	//       Or the transaction may have happened sufficiently long ago that the
	//       node no longer remembers it, and this will return an error.
	//     Produces:
	//     - application/json
	//     Schemes:
	//     - http
	//     Parameters:
	//       - name: txid
	//         in: path
	//         type: string
	//         pattern: "[A-Z0-9]+"
	//         required: true
	//         description: A transaction id
	//     Responses:
	//       200:
	//         "$ref": '#/responses/TransactionResponse'
	//       400:
	//         description: Bad Request
	//         schema: {type: string}
	//       404:
	//         description: Transaction Not Found
	//         schema: {type: string}
	//       401: { description: Invalid API Token }
	//       default: { description: Unknown Error }

	queryTxID := mux.Vars(r)["txid"]
	if queryTxID == "" {
		lib.ErrorResponse(w, http.StatusBadRequest, fmt.Errorf(errNoTxnSpecified), errNoTxnSpecified, ctx.Log)
		return
	}

	txID := transactions.Txid{}
	if txID.UnmarshalText([]byte(queryTxID)) != nil {
		lib.ErrorResponse(w, http.StatusBadRequest, fmt.Errorf(errNoTxnSpecified), errNoTxnSpecified, ctx.Log)
		return
	}

	if txn, ok := ctx.Node.GetPendingTransaction(txID); ok {
		var responseTxs Transaction
		responseTxs = txWithStatusEncode(txn)

		response := TransactionResponse{
			Body: &responseTxs,
		}

		SendJSON(response, w, ctx.Log)
		return
	}

	// We didn't find it, return a failure
	lib.ErrorResponse(w, http.StatusNotFound, errors.New(errTransactionNotFound), errTransactionNotFound, ctx.Log)
	return
}

// GetPendingTransactions is an httpHandler for route GET /v1/transactions/pending.
func GetPendingTransactions(ctx lib.ReqContext, w http.ResponseWriter, r *http.Request) {
	// swagger:operation GET /v1/transactions/pending GetPendingTransactions
	// ---
	//     Summary: Get a list of unconfirmed transactions currently in the transaction pool.
	//     Description: >
	//       Get the list of pending transactions, sorted by priority,
	//       in decreasing order, truncated at the end at MAX. If MAX = 0,
	//       returns all pending transactions.
	//     Produces:
	//     - application/json
	//     Schemes:
	//     - http
	//     Parameters:
	//       - name: max
	//         in: query
	//         type: integer
	//         format: int64
	//         minimum: 0
	//         required: false
	//         description: Truncated number of transactions to display. If max=0, returns all pending txns.
	//     Responses:
	//       "200":
	//         "$ref": '#/responses/PendingTransactionsResponse'
	//       500:
	//         description: Internal Error
	//         schema: {type: string}
	//       401: { description: Invalid API Token }
	//       default: { description: Unknown Error }
	max, err := strconv.ParseUint(r.FormValue("max"), 10, 64)
	if err != nil {
		max = 0
	}

	txs, err := ctx.Node.GetPendingTxnsFromPool()
	if err != nil {
		lib.ErrorResponse(w, http.StatusInternalServerError, err, errFailedLookingUpTransactionPool, ctx.Log)
		return
	}

	totalTxns := uint64(len(txs))
	if max > 0 && totalTxns > max {
		// we expose this truncating mechanism for the client only, for the flexibility
		// to avoid dumping the whole pool over REST or in a cli. There is no need to optimize
		// fetching a smaller transaction set at a lower level.
		txs = txs[:max]
	}

	responseTxs := make([]Transaction, len(txs))
	for i, twr := range txs {
		responseTxs[i] = paymentTxEncode(twr.Txn, transactions.ApplyData{})
	}

	response := PendingTransactionsResponse{
		Body: &PendingTransactions{
			TruncatedTxns: TransactionList{
				Transactions: responseTxs,
			},
			TotalTxns: totalTxns,
		},
	}

	SendJSON(response, w, ctx.Log)
}

// SuggestedFee is an httpHandler for route GET /v1/transactions/fee
func SuggestedFee(ctx lib.ReqContext, w http.ResponseWriter, r *http.Request) {
	// swagger:operation GET /v1/transactions/fee SuggestedFee
	// ---
	//     Summary: Get the suggested fee
	//     Description: >
	//       Suggested Fee is returned in units of micro-Algos per byte.
	//       Suggested Fee may fall to zero but submitted transactions
	//       must still have a fee of at least MinTxnFee for the current
	//       network protocol.
	//     Produces:
	//     - application/json
	//     Schemes:
	//     - http
	//     Responses:
	//       "200":
	//         "$ref": '#/responses/TransactionFeeResponse'
	//       401: { description: Invalid API Token }
	//       default: { description: Unknown Error }
	fee := TransactionFee{Fee: ctx.Node.SuggestedFee().Raw}
	SendJSON(TransactionFeeResponse{&fee}, w, ctx.Log)
}

// SuggestedParams is an httpHandler for route GET /v1/transactions/params
func SuggestedParams(ctx lib.ReqContext, w http.ResponseWriter, r *http.Request) {
	// swagger:operation GET /v1/transactions/params TransactionParams
	// ---
	//     Summary: Get parameters for constructing a new transaction
	//     Produces:
	//     - application/json
	//     Schemes:
	//     - http
	//     Responses:
	//       "200":
	//         "$ref": '#/responses/TransactionParamsResponse'
	//       401: { description: Invalid API Token }
	//       default: { description: Unknown Error }
	stat, err := ctx.Node.Status()
	if err != nil {
		lib.ErrorResponse(w, http.StatusInternalServerError, err, errFailedRetrievingNodeStatus, ctx.Log)
		return
	}

	gh := ctx.Node.GenesisHash()

	var params TransactionParams
	params.Fee = ctx.Node.SuggestedFee().Raw
	params.GenesisID = ctx.Node.GenesisID()
	params.GenesisHash = gh[:]
	params.LastRound = uint64(stat.LastRound)
	params.ConsensusVersion = string(stat.LastVersion)
	SendJSON(TransactionParamsResponse{&params}, w, ctx.Log)
}

// GetBlock is an httpHandler for route GET /v1/block/{round}
func GetBlock(ctx lib.ReqContext, w http.ResponseWriter, r *http.Request) {
	// swagger:operation GET /v1/block/{round} GetBlock
	// ---
	//     Summary: Get the block for the given round.
	//     Produces:
	//     - application/json
	//     Schemes:
	//     - http
	//     Parameters:
	//       - name: round
	//         in: path
	//         type: integer
	//         format: int64
	//         minimum: 0
	//         required: true
	//         description: The round from which to fetch block information.
	//     Responses:
	//       200:
	//         "$ref": '#/responses/BlockResponse'
	//       400:
	//         description: Bad Request
	//         schema: {type: string}
	//       500:
	//         description: Internal Error
	//         schema: {type: string}
	//       401: { description: Invalid API Token }
	//       default: { description: Unknown Error }
	queryRound, err := strconv.ParseUint(mux.Vars(r)["round"], 10, 64)
	if err != nil {
		lib.ErrorResponse(w, http.StatusBadRequest, err, errFailedParsingRoundNumber, ctx.Log)
		return
	}

	b, c, err := ctx.Node.GetBlock(basics.Round(queryRound))
	if err != nil {
		lib.ErrorResponse(w, http.StatusInternalServerError, err, errFailedLookingUpLedger, ctx.Log)
		return
	}
	block, err := blockEncode(b, c)

	if err != nil {
		lib.ErrorResponse(w, http.StatusInternalServerError, err, errInternalFailure, ctx.Log)
		return
	}

	SendJSON(BlockResponse{&block}, w, ctx.Log)
}

// GetSupply is an httpHandler for route GET /v1/ledger/supply
func GetSupply(ctx lib.ReqContext, w http.ResponseWriter, r *http.Request) {
	// swagger:operation GET /v1/ledger/supply GetSupply
	//---
	//     Summary: Get the current supply reported by the ledger.
	//     Produces:
	//     - application/json
	//     Schemes:
	//     - http
	//     Responses:
	//       200:
	//         "$ref": '#/responses/SupplyResponse'
	//       401: { description: Invalid API Token }
	//       default: { description: Unknown Error }
	balances := ctx.Node.GetSupply()
	supply := Supply{
		Round:       uint64(balances.Round),
		TotalMoney:  balances.TotalMoney.Raw,
		OnlineMoney: balances.OnlineMoney.Raw,
	}
	SendJSON(SupplyResponse{&supply}, w, ctx.Log)
}

func parseTime(t string) (res time.Time, err error) {
	// check for just date
	res, err = time.Parse("2006-01-02", t)
	if err == nil {
		return
	}

	// check for date and time
	res, err = time.Parse(time.RFC3339, t)
	if err == nil {
		return
	}

	return
}

// Transactions is an httpHandler for route GET /v1/account/{addr:[A-Z0-9]+}/transactions
func Transactions(ctx lib.ReqContext, w http.ResponseWriter, r *http.Request) {
	// swagger:operation GET /v1/account/{address}/transactions Transactions
	// ---
	//     Summary: Get a list of confirmed transactions.
	//     Description: Returns the list of confirmed transactions between within a date range. This call is available only when the indexer is running.
	//     Produces:
	//     - application/json
	//     Schemes:
	//     - http
	//     Parameters:
	//       - name: address
	//         in: path
	//         type: string
	//         pattern: "[A-Z0-9]{58}"
	//         required: true
	//         description: An account public key
	//       - name: firstRound
	//         in: query
	//         type: integer
	//         format: int64
	//         minimum: 0
	//         required: false
	//         description: Do not fetch any transactions before this round.
	//       - name: lastRound
	//         in: query
	//         type: integer
	//         format: int64
	//         minimum: 0
	//         required: false
	//         description: Do not fetch any transactions after this round.
	//       - name: fromDate
	//         in: query
	//         type: string
	//         format: date
	//         required: false
	//         description: Do not fetch any transactions before this date. (enabled only with indexer)
	//       - name: toDate
	//         in: query
	//         type: string
	//         format: date
	//         required: false
	//         description: Do not fetch any transactions after this date. (enabled only with indexer)
	//       - name: max
	//         in: query
	//         type: integer
	//         format: int64
	//         required: false
	//         description: maximum transactions to show (default to 100)
	//     Responses:
	//       200:
	//         "$ref": '#/responses/TransactionsResponse'
	//       400:
	//         description: Bad Request
	//         schema: {type: string}
	//       500:
	//         description: Internal Error
	//         schema: {type: string}
	//       401: { description: Invalid API Token }
	//       default: { description: Unknown Error }

	queryAddr := mux.Vars(r)["addr"]
	addr, err := basics.UnmarshalChecksumAddress(queryAddr)
	if err != nil {
		lib.ErrorResponse(w, http.StatusBadRequest, err, errFailedToParseAddress, ctx.Log)
		return
	}

	max, err := strconv.ParseUint(r.FormValue("max"), 10, 64)
	if err != nil {
		max = 100
	}

	// Get different params
	firstRound := r.FormValue("firstRound")
	lastRound := r.FormValue("lastRound")
	fromDate := r.FormValue("fromDate")
	toDate := r.FormValue("toDate")

	var rounds []uint64
	var txs []node.TxnWithStatus
	// Were rounds provided?
	if firstRound != "" && lastRound != "" {
		// Are they valid?
		fR, err := strconv.ParseUint(firstRound, 10, 64)
		if err != nil {
			lib.ErrorResponse(w, http.StatusBadRequest, err, errFailedParsingRoundNumber, ctx.Log)
			return
		}

		lR, err := strconv.ParseUint(lastRound, 10, 64)
		if err != nil {
			lib.ErrorResponse(w, http.StatusBadRequest, err, errFailedParsingRoundNumber, ctx.Log)
			return
		}

		txs, err = ctx.Node.ListTxns(addr, basics.Round(fR), basics.Round(lR))
		if err != nil {
			switch err.(type) {
			case ledger.ErrNoEntry:
				if !ctx.Node.IsArchival() {
					lib.ErrorResponse(w, http.StatusInternalServerError, err, errBlockHashBeenDeletedArchival, ctx.Log)
					return
				}
			}

			lib.ErrorResponse(w, http.StatusInternalServerError, err, err.Error(), ctx.Log)
			return
		}

	} else {
		// is indexer on?
		indexer, err := ctx.Node.Indexer()
		if err != nil {
			lib.ErrorResponse(w, http.StatusBadRequest, err, errNoRoundsSpecified, ctx.Log)
			return
		}

		// Were dates provided?
		if fromDate != "" && toDate != "" {
			fd, err := parseTime(fromDate)
			if err != nil {
				lib.ErrorResponse(w, http.StatusBadRequest, err, err.Error(), ctx.Log)
				return
			}

			td, err := parseTime(toDate)
			if err != nil {
				lib.ErrorResponse(w, http.StatusBadRequest, err, err.Error(), ctx.Log)
				return
			}

			rounds, err = indexer.GetRoundsByAddressAndDate(addr.String(), max, fd.Unix(), td.Unix())
			if err != nil {
				lib.ErrorResponse(w, http.StatusInternalServerError, err, err.Error(), ctx.Log)
				return
			}

		} else {
			// return last [max] transactions
			rounds, err = indexer.GetRoundsByAddress(addr.String(), max)
			if err != nil {
				lib.ErrorResponse(w, http.StatusInternalServerError, err, errFailedGettingInformationFromIndexer, ctx.Log)
				return
			}
		}
	}

	if len(rounds) > 0 {
		for _, rnd := range rounds {
			txns, _ := ctx.Node.ListTxns(addr, basics.Round(rnd), basics.Round(rnd))
			txs = append(txs, txns...)

			// They may be more txns in the round than requested, break.
			if uint64(len(txs)) > max {
				break
			}
		}
	}

	// clip length to [max]
	if uint64(len(txs)) > max {
		txs = txs[:max]
	}

	responseTxs := make([]Transaction, len(txs))
	for i, twr := range txs {
		responseTxs[i] = txWithStatusEncode(twr)
	}

	response := TransactionsResponse{
		&TransactionList{
			Transactions: responseTxs,
		},
	}

	SendJSON(response, w, ctx.Log)
}

// GetTransactionByID is an httpHandler for route GET /v1/transaction/{txid}
func GetTransactionByID(ctx lib.ReqContext, w http.ResponseWriter, r *http.Request) {
	// swagger:operation GET /v1/transaction/{txid} Transaction
	// ---
	//     Summary: Get an information of a single transaction.
	//     Description: Returns the transaction information of the given txid. Works only if the indexer is enabled.
	//     Produces:
	//     - application/json
	//     Schemes:
	//     - http
	//     Parameters:
	//       - name: txid
	//         in: path
	//         type: string
	//         pattern: "[A-Z0-9]+"
	//         required: true
	//         description: A transaction id
	//     Responses:
	//       200:
	//         "$ref": '#/responses/TransactionResponse'
	//       400:
	//         description: Bad Request
	//         schema: {type: string}
	//       404:
	//         description: Transaction Not Found
	//         schema: {type: string}
	//       401: { description: Invalid API Token }
	//       default: { description: Unknown Error }

	indexer, err := ctx.Node.Indexer()
	if err != nil {
		lib.ErrorResponse(w, http.StatusInternalServerError, err, errIndexerNotRunning, ctx.Log)
		return
	}

	queryTxID := mux.Vars(r)["txid"]
	if queryTxID == "" {
		lib.ErrorResponse(w, http.StatusBadRequest, fmt.Errorf(errNoTxnSpecified), errNoTxnSpecified, ctx.Log)
		return
	}

	var txID transactions.Txid
	if err := txID.UnmarshalText([]byte(queryTxID)); err != nil {
		lib.ErrorResponse(w, http.StatusBadRequest, err, err.Error(), ctx.Log)
		return
	}

	rnd, err := indexer.GetRoundByTXID(queryTxID)
	if err != nil {
		lib.ErrorResponse(w, http.StatusInternalServerError, err, errFailedGettingInformationFromIndexer, ctx.Log)
		return
	}

	if txn, err := ctx.Node.GetTransactionByID(txID, basics.Round(rnd)); err == nil {
		var responseTxs Transaction
		responseTxs = txWithStatusEncode(txn)

		response := TransactionResponse{
			Body: &responseTxs,
		}

		SendJSON(response, w, ctx.Log)
		return
	}

	// We didn't find it, return a failure
	lib.ErrorResponse(w, http.StatusNotFound, errors.New(errTransactionNotFound), errTransactionNotFound, ctx.Log)
	return
}

Consider looking up the last block and using that block's consensus params.