83 lines
2.1 KiB
Go
83 lines
2.1 KiB
Go
package rest
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import (
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"encoding/base64"
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"fmt"
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"io/ioutil"
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"net/http"
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"github.com/cosmos/cosmos-sdk/x/auth/signing"
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"github.com/cosmos/cosmos-sdk/client"
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clienttx "github.com/cosmos/cosmos-sdk/client/tx"
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"github.com/cosmos/cosmos-sdk/types/rest"
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"github.com/cosmos/cosmos-sdk/x/auth/legacy/legacytx"
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)
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type (
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// DecodeReq defines a tx decoding request.
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DecodeReq struct {
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Tx string `json:"tx"`
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}
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// DecodeResp defines a tx decoding response.
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DecodeResp legacytx.StdTx
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)
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// DecodeTxRequestHandlerFn returns the decode tx REST handler. In particular,
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// it takes base64-decoded bytes, decodes it from the Amino wire protocol,
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// and responds with a json-formatted transaction.
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func DecodeTxRequestHandlerFn(clientCtx client.Context) http.HandlerFunc {
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return func(w http.ResponseWriter, r *http.Request) {
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var req DecodeReq
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body, err := ioutil.ReadAll(r.Body)
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if rest.CheckBadRequestError(w, err) {
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return
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}
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// NOTE: amino is used intentionally here, don't migrate it
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err = clientCtx.LegacyAmino.UnmarshalJSON(body, &req)
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if rest.CheckBadRequestError(w, err) {
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return
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}
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txBytes, err := base64.StdEncoding.DecodeString(req.Tx)
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if rest.CheckBadRequestError(w, err) {
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return
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}
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stdTx, ok := convertToStdTx(w, clientCtx, txBytes)
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if !ok {
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return
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}
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response := DecodeResp(stdTx)
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rest.PostProcessResponse(w, clientCtx, response)
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}
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}
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// convertToStdTx converts tx proto binary bytes retrieved from Tendermint into
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// a StdTx. Returns the StdTx, as well as a flag denoting if the function
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// successfully converted or not.
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func convertToStdTx(w http.ResponseWriter, clientCtx client.Context, txBytes []byte) (legacytx.StdTx, bool) {
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txI, err := clientCtx.TxConfig.TxDecoder()(txBytes)
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if rest.CheckBadRequestError(w, err) {
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return legacytx.StdTx{}, false
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}
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tx, ok := txI.(signing.Tx)
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if !ok {
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rest.WriteErrorResponse(w, http.StatusBadRequest, fmt.Sprintf("%+v is not backwards compatible with %T", tx, legacytx.StdTx{}))
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return legacytx.StdTx{}, false
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}
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stdTx, err := clienttx.ConvertTxToStdTx(clientCtx.LegacyAmino, tx)
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if rest.CheckBadRequestError(w, err) {
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return legacytx.StdTx{}, false
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}
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return stdTx, true
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}
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