82 lines
2.3 KiB
Go
82 lines
2.3 KiB
Go
package roles
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import (
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"github.com/tendermint/basecoin"
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"github.com/tendermint/basecoin/stack"
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"github.com/tendermint/basecoin/state"
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)
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// Middleware allows us to add a requested role as a permission
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// if the tx requests it and has sufficient authority
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type Middleware struct {
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stack.PassOption
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}
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var _ stack.Middleware = Middleware{}
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// NewMiddleware creates a role-checking middleware
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func NewMiddleware() Middleware {
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return Middleware{}
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}
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// Name - return name space
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func (Middleware) Name() string {
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return NameRole
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}
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// CheckTx tries to assume the named role if requested.
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// If no role is requested, do nothing.
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// If insufficient authority to assume the role, return error.
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func (m Middleware) CheckTx(ctx basecoin.Context, store state.SimpleDB, tx basecoin.Tx, next basecoin.Checker) (res basecoin.Result, err error) {
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// if this is not an AssumeRoleTx, then continue
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assume, ok := tx.Unwrap().(AssumeRoleTx)
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if !ok { // this also breaks the recursion below
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return next.CheckTx(ctx, store, tx)
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}
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ctx, err = assumeRole(ctx, store, assume)
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if err != nil {
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return res, err
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}
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// one could add multiple role statements, repeat as needed
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return m.CheckTx(ctx, store, assume.Tx, next)
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}
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// DeliverTx tries to assume the named role if requested.
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// If no role is requested, do nothing.
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// If insufficient authority to assume the role, return error.
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func (m Middleware) DeliverTx(ctx basecoin.Context, store state.SimpleDB, tx basecoin.Tx, next basecoin.Deliver) (res basecoin.Result, err error) {
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// if this is not an AssumeRoleTx, then continue
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assume, ok := tx.Unwrap().(AssumeRoleTx)
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if !ok { // this also breaks the recursion below
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return next.DeliverTx(ctx, store, tx)
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}
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ctx, err = assumeRole(ctx, store, assume)
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if err != nil {
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return res, err
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}
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// one could add multiple role statements, repeat as needed
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return m.DeliverTx(ctx, store, assume.Tx, next)
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}
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func assumeRole(ctx basecoin.Context, store state.SimpleDB, assume AssumeRoleTx) (basecoin.Context, error) {
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err := assume.ValidateBasic()
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if err != nil {
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return nil, err
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}
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role, err := loadRole(store, assume.Role)
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if err != nil {
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return nil, err
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}
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if !role.IsAuthorized(ctx) {
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return nil, ErrInsufficientSigs()
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}
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ctx = ctx.WithPermissions(NewPerm(assume.Role))
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return ctx, nil
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}
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