Add roles middleware and handler

modules/coin/handler.go

@@ -1,8 +1,6 @@
 package coin
 
 import (
-	"fmt"
-
 	"github.com/tendermint/go-wire/data"
 	"github.com/tendermint/tmlibs/log"
 
@@ -106,8 +104,7 @@ func (h Handler) SetOption(l log.Logger, store state.KVStore, module, key, value
 		return "Success", nil
 
 	}
-	msg := fmt.Sprintf("Unknown key: %s", key)
-	return "", errors.ErrInternal(msg)
+	return errors.ErrUnknownKey(key)
 }
 
 func checkTx(ctx basecoin.Context, tx basecoin.Tx) (send SendTx, err error) {

modules/roles/handler.go

@@ -1,4 +1,63 @@
 package roles
 
+import (
+	"github.com/tendermint/tmlibs/log"
+
+	"github.com/tendermint/basecoin"
+	"github.com/tendermint/basecoin/errors"
+	"github.com/tendermint/basecoin/state"
+)
+
 //NameRole - name space of the roles module
 const NameRole = "role"
+
+type Handler struct{}
+
+var _ basecoin.Handler = Handler{}
+
+// NewHandler makes a role handler to create roles
+func NewHandler() Handler {
+	return Handler{}
+}
+
+// Name - return name space
+func (Handler) Name() string {
+	return NameRole
+}
+
+// CheckTx checks if there is enough money in the account
+func (h Handler) CheckTx(ctx basecoin.Context, store state.KVStore, tx basecoin.Tx) (res basecoin.Result, err error) {
+	_, err = checkTx(ctx, tx)
+	return res, err
+}
+
+// DeliverTx moves the money
+func (h Handler) DeliverTx(ctx basecoin.Context, store state.KVStore, tx basecoin.Tx) (res basecoin.Result, err error) {
+	create, err := checkTx(ctx, tx)
+	if err != nil {
+		return res, err
+	}
+
+	// lets try...
+	role := NewRole(create.MinSigs, create.Signers)
+	err = createRole(store, MakeKey(create.Role), role)
+	return res, err
+}
+
+// SetOption - sets the genesis account balance
+func (h Handler) SetOption(l log.Logger, store state.KVStore, module, key, value string) (log string, err error) {
+	if module != NameRole {
+		return "", errors.ErrUnknownModule(module)
+	}
+	return "", errors.ErrUnknownKey(key)
+}
+
+func checkTx(ctx basecoin.Context, tx basecoin.Tx) (create CreateRoleTx, err error) {
+	// check if the tx is proper type and valid
+	create, ok := tx.Unwrap().(CreateRoleTx)
+	if !ok {
+		return create, errors.ErrInvalidFormat(tx)
+	}
+	err = create.ValidateBasic()
+	return create, err
+}

modules/roles/middleware.go

@@ -1 +1,81 @@
 package roles
+
+import (
+	"github.com/tendermint/basecoin"
+	"github.com/tendermint/basecoin/errors"
+	"github.com/tendermint/basecoin/stack"
+	"github.com/tendermint/basecoin/state"
+)
+
+type Middleware struct {
+	stack.PassOption
+}
+
+var _ stack.Middleware = Middleware{}
+
+func NewMiddleware() Middleware {
+	return Middleware{}
+}
+
+// Name - return name space
+func (Middleware) Name() string {
+	return NameRole
+}
+
+// CheckTx checks if this is valid
+func (m Middleware) CheckTx(ctx basecoin.Context, store state.KVStore, tx basecoin.Tx, next basecoin.Checker) (res basecoin.Result, err error) {
+	assume, err := checkMiddleTx(ctx, tx)
+	if err != nil {
+		return res, err
+	}
+
+	ctx, err = assumeRole(ctx, store, assume)
+	if err != nil {
+		return res, err
+	}
+
+	return next.CheckTx(ctx, store, assume.Tx)
+}
+
+// DeliverTx moves the money
+func (m Middleware) DeliverTx(ctx basecoin.Context, store state.KVStore, tx basecoin.Tx, next basecoin.Deliver) (res basecoin.Result, err error) {
+	assume, err := checkMiddleTx(ctx, tx)
+	if err != nil {
+		return res, err
+	}
+
+	ctx, err = assumeRole(ctx, store, assume)
+	if err != nil {
+		return res, err
+	}
+
+	return next.DeliverTx(ctx, store, assume.Tx)
+}
+
+func checkMiddleTx(ctx basecoin.Context, tx basecoin.Tx) (assume AssumeRoleTx, err error) {
+	// check if the tx is proper type and valid
+	assume, ok := tx.Unwrap().(AssumeRoleTx)
+	if !ok {
+		return assume, errors.ErrInvalidFormat(tx)
+	}
+	err = assume.ValidateBasic()
+	if err != nil {
+		return assume, err
+	}
+
+	// load it up and check it out...
+	return assume, err
+}
+
+func assumeRole(ctx basecoin.Context, store state.KVStore, assume AssumeRoleTx) (basecoin.Context, error) {
+	role, err := loadRole(store, MakeKey(assume.Role))
+	if err != nil {
+		return nil, err
+	}
+
+	if !role.IsAuthorized(ctx) {
+		return nil, ErrInsufficientSigs()
+	}
+	ctx = ctx.WithPermissions(NewPerm(assume.Role))
+	return ctx, nil
+}

modules/roles/store.go

@@ -9,6 +9,13 @@ import (
 	wire "github.com/tendermint/go-wire"
 )
 
+func NewPerm(role []byte) basecoin.Actor {
+	return basecoin.Actor{
+		App:     NameRole,
+		Address: role,
+	}
+}
+
 // Role - structure to hold permissioning
 type Role struct {
 	MinSigs uint32           `json:"min_sigs"`