82 lines
1.8 KiB
Go
82 lines
1.8 KiB
Go
package auth
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import (
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sdk "github.com/cosmos/cosmos-sdk/types"
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)
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func NewAnteHandler(accountMapper sdk.AccountMapper) sdk.AnteHandler {
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return func(
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ctx sdk.Context, tx sdk.Tx,
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) (newCtx sdk.Context, res sdk.Result, abort bool) {
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// Deduct the fee from the fee payer.
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// This is done first because it only
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// requires fetching 1 account.
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payerAddr := tx.GetFeePayer()
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payerAcc := accountMapper.GetAccount(ctx, payerAddr)
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if payerAcc == nil {
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return ctx, sdk.Result{
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Code: 1, // TODO
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}, true
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}
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// payerAcc.Subtract ?
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// Ensure that signatures are correct.
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var signerAddrs = tx.GetSigners()
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var signerAccs = make([]sdk.Account, len(signerAddrs))
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var signatures = tx.GetSignatures()
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// Assert that there are signers.
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if len(signatures) == 0 {
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return ctx, sdk.Result{
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Code: 1, // TODO
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}, true
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}
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if len(signatures) != len(signerAddrs) {
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return ctx, sdk.Result{
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Code: 1, // TODO
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}, true
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}
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// Check each nonce and sig.
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for i, sig := range signatures {
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var signerAcc = accountMapper.GetAccount(ctx, signerAddrs[i])
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signerAccs[i] = signerAcc
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// If no pubkey, set pubkey.
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if signerAcc.GetPubKey() == nil {
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err := signerAcc.SetPubKey(sig.PubKey)
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if err != nil {
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return ctx, sdk.Result{
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Code: 1, // TODO
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}, true
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}
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}
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// Check and increment sequence number.
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seq := signerAcc.GetSequence()
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if seq != sig.Sequence {
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return ctx, sdk.Result{
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Code: 1, // TODO
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}, true
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}
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signerAcc.SetSequence(seq + 1)
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// Check sig.
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if !sig.PubKey.VerifyBytes(tx.GetSignBytes(), sig.Signature) {
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return ctx, sdk.Result{
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Code: 1, // TODO
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}, true
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}
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// Save the account.
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accountMapper.SetAccount(ctx, signerAcc)
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}
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ctx = WithSigners(ctx, signerAccs)
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return ctx, sdk.Result{}, false // continue...
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}
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}
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