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handler.go
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handler.go
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package multisig
import (
"fmt"
sdk "github.com/cosmos/cosmos-sdk/types"
)
// NewHandler returns a handler for "multisig" type messages.
func NewHandler(keeper Keeper) sdk.Handler {
return func(ctx sdk.Context, msg sdk.Msg) sdk.Result {
switch msg := msg.(type) {
case MsgCreateWallet:
return handleMsgCreateWallet(ctx, keeper, msg)
case MsgCreateTransaction:
return handleMsgCreateTransaction(ctx, keeper, msg)
case MsgSignTransaction:
return handleMsgSignTransaction(ctx, keeper, msg)
case MsgCompleteTransaction:
return handleMsgCompleteTransaction(ctx, keeper, msg)
default:
errMsg := fmt.Sprintf("Unrecognized multisig Msg type: %v", msg.Type())
return sdk.ErrUnknownRequest(errMsg).Result()
}
}
}
// Handle a message to create wallet
func handleMsgCreateWallet(ctx sdk.Context, keeper Keeper, msg MsgCreateWallet) sdk.Result {
var err error
// check the wallet does not already exist
wallet := keeper.GetWallet(ctx, msg.Address.String())
if !wallet.Address.Empty() {
return sdk.ErrUnauthorized("Wallet already exists").Result()
}
wallet, err = NewMultiSigWallet(msg.Name, msg.PubKeys, msg.MinSigTx)
if err != nil {
return sdk.ErrUnknownRequest(
fmt.Sprintf("Error creating new wallet: %s", err.Error()),
).Result()
}
keeper.SetWallet(ctx, wallet)
return sdk.Result{}
}
// Handle a message to create transaction
func handleMsgCreateTransaction(ctx sdk.Context, keeper Keeper, msg MsgCreateTransaction) sdk.Result {
// check the transaction does not already exist
transaction := keeper.GetTransaction(ctx, msg.UUID)
if !transaction.From.Empty() {
return sdk.ErrUnauthorized("Transaction already exists").Result()
}
wallet := keeper.GetWallet(ctx, msg.From.String())
if !wallet.Address.Empty() {
return sdk.ErrUnauthorized("No registered multi-signature wallet for 'from' address").Result()
}
sigs := make([]Signature, len(wallet.PubKeys))
for i, pubkey := range wallet.PubKeys {
var err error
sigs[i].PubKey, err = sdk.GetAccPubKeyBech32(pubkey)
if err != nil {
return sdk.ErrUnknownRequest(
fmt.Sprintf("Error creating new transaction: %s", err.Error()),
).Result()
}
}
transaction = NewTransaction(
msg.From,
msg.To,
msg.Coins,
ctx.BlockHeight(),
sigs,
)
keeper.SetTransaction(ctx, transaction)
return sdk.Result{}
}
// Handle a message to sign transaction
func handleMsgSignTransaction(ctx sdk.Context, keeper Keeper, msg MsgSignTransaction) sdk.Result {
var err error
transaction := keeper.GetTransaction(ctx, msg.UUID)
if !transaction.From.Empty() {
return sdk.ErrUnauthorized("No transaction found.").Result()
}
err = transaction.AddSignature(msg.Signature)
if err != nil {
return sdk.ErrUnauthorized(
fmt.Sprintf("Failed to sign transaction: %s", err.Error()),
).Result()
}
keeper.SetTransaction(ctx, transaction)
return sdk.Result{}
}
// Handle a message to complete transaction
func handleMsgCompleteTransaction(ctx sdk.Context, keeper Keeper, msg MsgCompleteTransaction) sdk.Result {
transaction := keeper.GetTransaction(ctx, msg.UUID)
if !transaction.From.Empty() {
return sdk.ErrUnauthorized("No transaction found.").Result()
}
transaction.TxID = msg.TxID
keeper.SetTransaction(ctx, transaction)
return sdk.Result{}
}