From 4dc09ab6582988e7ff2d07a3dae514ad7d41e57c Mon Sep 17 00:00:00 2001
From: Reuven Podmazo <reuven@enigma.co>
Date: Thu, 7 Oct 2021 18:14:09 +0300
Subject: [PATCH] copied /tx POST from terra-money/core/pull/551

---
 x/auth/client/rest/broadcast.go | 119 ++++++++++++++++++++++++++++++++
 x/auth/client/rest/rest.go      |   1 +
 2 files changed, 120 insertions(+)
 create mode 100644 x/auth/client/rest/broadcast.go

diff --git a/x/auth/client/rest/broadcast.go b/x/auth/client/rest/broadcast.go
new file mode 100644
index 000000000000..8a665189fd8d
--- /dev/null
+++ b/x/auth/client/rest/broadcast.go
@@ -0,0 +1,119 @@
+package rest
+
+import (
+	"errors"
+	"fmt"
+	"io/ioutil"
+	"net/http"
+
+	"github.com/cosmos/cosmos-sdk/client"
+	clientrest "github.com/cosmos/cosmos-sdk/client/rest"
+	codectypes "github.com/cosmos/cosmos-sdk/codec/types"
+	sdk "github.com/cosmos/cosmos-sdk/types"
+	"github.com/cosmos/cosmos-sdk/types/rest"
+	"github.com/cosmos/cosmos-sdk/x/auth/legacy/legacytx"
+)
+
+// BroadcastReq defines a tx broadcasting request.
+type BroadcastReq struct {
+	Tx         legacytx.StdTx `json:"tx" yaml:"tx"`
+	Mode       string         `json:"mode" yaml:"mode"`
+	Sequences  []uint64       `json:"sequences" yaml:"sequences"`
+	FeeGranter string         `json:"fee_granter" yaml:"fee_granter"`
+}
+
+var _ codectypes.UnpackInterfacesMessage = BroadcastReq{}
+
+// UnpackInterfaces implements the UnpackInterfacesMessage interface.
+func (m BroadcastReq) UnpackInterfaces(unpacker codectypes.AnyUnpacker) error {
+	return m.Tx.UnpackInterfaces(unpacker)
+}
+
+// BroadcastTxRequest implements a tx broadcasting handler that is responsible
+// for broadcasting a valid and signed tx to a full node. The tx can be
+// broadcasted via a sync|async|block mechanism.
+func BroadcastTxRequest(clientCtx client.Context) http.HandlerFunc {
+	return func(w http.ResponseWriter, r *http.Request) {
+		var req BroadcastReq
+
+		body, err := ioutil.ReadAll(r.Body)
+		if rest.CheckBadRequestError(w, err) {
+			return
+		}
+
+		// NOTE: amino is used intentionally here, don't migrate it!
+		err = clientCtx.LegacyAmino.UnmarshalJSON(body, &req)
+		if err != nil {
+			err := fmt.Errorf("this transaction cannot be broadcasted via legacy REST endpoints, because it does not support"+
+				" Amino serialization. Please either use CLI, gRPC, gRPC-gateway, or directly query the Tendermint RPC"+
+				" endpoint to broadcast this transaction. The new REST endpoint (via gRPC-gateway) is POST /cosmos/tx/v1beta1/txs."+
+				" Please also see the REST endpoints migration guide at %s for more info", clientrest.DeprecationURL)
+			if rest.CheckBadRequestError(w, err) {
+				return
+			}
+		}
+
+		txBuilder := clientCtx.TxConfig.NewTxBuilder()
+		txBuilder.SetFeeAmount(req.Tx.GetFee())
+		txBuilder.SetGasLimit(req.Tx.GetGas())
+		txBuilder.SetMemo(req.Tx.GetMemo())
+		if err := txBuilder.SetMsgs(req.Tx.GetMsgs()...); rest.CheckBadRequestError(w, err) {
+			return
+		}
+
+		txBuilder.SetTimeoutHeight(req.Tx.GetTimeoutHeight())
+		if req.FeeGranter != "" {
+			addr, err := sdk.AccAddressFromBech32(req.FeeGranter)
+			if rest.CheckBadRequestError(w, err) {
+				return
+			}
+
+			txBuilder.SetFeeGranter(addr)
+		}
+
+		signatures, err := req.Tx.GetSignaturesV2()
+		if rest.CheckBadRequestError(w, err) {
+			return
+		}
+
+		// if sequence is not given, try fetch from the chain
+		if len(req.Sequences) == 0 {
+			for _, sig := range signatures {
+				_, seq, err := clientCtx.AccountRetriever.GetAccountNumberSequence(clientCtx, sdk.AccAddress(sig.PubKey.Address().Bytes()))
+				if rest.CheckBadRequestError(w, err) {
+					return
+				}
+				req.Sequences = append(req.Sequences, seq)
+			}
+		}
+
+		// check the sequence nubmer is equal with the signature nubmer
+		if len(signatures) != len(req.Sequences) {
+			rest.CheckBadRequestError(w, errors.New("Must provide each signers's sequence number"))
+			return
+		}
+
+		// fill sequence number to new signature
+		for i, seq := range req.Sequences {
+			signatures[i].Sequence = seq
+		}
+
+		if err := txBuilder.SetSignatures(signatures...); rest.CheckBadRequestError(w, err) {
+			return
+		}
+
+		// compute signature bytes
+		txBytes, err := clientCtx.TxConfig.TxEncoder()(txBuilder.GetTx())
+		if rest.CheckInternalServerError(w, err) {
+			return
+		}
+
+		clientCtx = clientCtx.WithBroadcastMode(req.Mode)
+		res, err := clientCtx.BroadcastTx(txBytes)
+		if rest.CheckInternalServerError(w, err) {
+			return
+		}
+
+		rest.PostProcessResponseBare(w, clientCtx, res)
+	}
+}
diff --git a/x/auth/client/rest/rest.go b/x/auth/client/rest/rest.go
index 56eb3cf30682..98c7a4673b1c 100644
--- a/x/auth/client/rest/rest.go
+++ b/x/auth/client/rest/rest.go
@@ -30,6 +30,7 @@ func RegisterTxRoutes(clientCtx client.Context, rtr *mux.Router) {
 	r := rest.WithHTTPDeprecationHeaders(rtr)
 	r.HandleFunc("/txs/{hash}", QueryTxRequestHandlerFn(clientCtx)).Methods("GET")
 	r.HandleFunc("/txs", QueryTxsRequestHandlerFn(clientCtx)).Methods("GET")
+	r.HandleFunc("/txs", BroadcastTxRequest(clientCtx)).Methods("POST")
 	r.HandleFunc("/txs/encode", EncodeTxRequest(clientCtx)).Methods("POST")
 	r.HandleFunc("/txs/decode", DecodeTxRequestHandlerFn(clientCtx)).Methods("POST")
 }