Move token generator to backend

internal/backends/memory/backend.go

@@ -34,7 +34,7 @@ func (backend *Backend) Register(username, password, device string) (user intern
 		return nil, "", internal.NewError(models.M_USER_IN_USE, "trying to register a user ID which has been taken")
 	}
 
-	token = internal.NewToken(internal.DefaultTokenSize)
+	token = newToken(defaultTokenSize)
 
 	user = &User{
 		name:     username,
@@ -62,7 +62,7 @@ func (backend *Backend) Login(username, password, device string) (token string,
 		return "", internal.NewError(models.M_FORBIDDEN, "wrong password")
 	}
 
-	token = internal.NewToken(internal.DefaultTokenSize)
+	token = newToken(defaultTokenSize)
 
 	backend.data[username].(*User).Tokens[token] = Token{Device: device}
 

internal/backends/memory/consts.go

@@ -3,4 +3,5 @@ package memory
 const (
 	groupIDSize      = 16
 	eventIDSize      = 16
+	defaultTokenSize = 16
 )

internal/backends/memory/tokens.go

@@ -0,0 +1,17 @@
+package memory
+
+import (
+	"crypto/rand"
+	"fmt"
+)
+
+// newToken returns new generated token with specified length
+func newToken(size int) string {
+	b := make([]byte, size)
+	_, err := rand.Read(b)
+	if err != nil {
+		panic(err)
+	}
+
+	return fmt.Sprintf("%x", b)
+}

internal/backends/memory/user.go

@@ -44,7 +44,7 @@ func (user *User) CreateRoom(request createroom.Request) (internal.Room, *models
 	events = append(events, RoomEvent{
 		Content:        nil,
 		Type:           rooms.Create,
-		EventID:        internal.NewToken(eventIDSize),
+		EventID:        newToken(eventIDSize),
 		Sender:         user,
 		OriginServerTS: t})
 
@@ -54,7 +54,7 @@ func (user *User) CreateRoom(request createroom.Request) (internal.Room, *models
 	events = append(events, RoomEvent{
 		Content:        []byte(request.Visibility), // TODO: check visibility vs join rules
 		Type:           rooms.JoinRules,
-		EventID:        internal.NewToken(eventIDSize),
+		EventID:        newToken(eventIDSize),
 		Sender:         user,
 		OriginServerTS: t})
 
@@ -63,7 +63,7 @@ func (user *User) CreateRoom(request createroom.Request) (internal.Room, *models
 		events = append(events, RoomEvent{
 			Content:        nil, // TODO: add
 			Type:           rooms.Name,
-			EventID:        internal.NewToken(eventIDSize),
+			EventID:        newToken(eventIDSize),
 			Sender:         user,
 			OriginServerTS: t})
 	}
@@ -73,13 +73,13 @@ func (user *User) CreateRoom(request createroom.Request) (internal.Room, *models
 		events = append(events, RoomEvent{
 			Content:        nil, // TODO: add
 			Type:           rooms.CanonicalAlias,
-			EventID:        internal.NewToken(eventIDSize),
+			EventID:        newToken(eventIDSize),
 			Sender:         user,
 			OriginServerTS: t})
 	}
 
 	room := &Room{
-		id:        internal.NewToken(groupIDSize),
+		id:        newToken(groupIDSize),
 		aliasName: request.RoomAliasName,
 		name:      request.Name,
 		topic:     request.Topic,

internal/consts.go

@@ -2,7 +2,6 @@ package internal
 
 const (
 	Version = "r0.5.0"
-	DefaultTokenSize = 16
 )
 
 // https://matrix.org/docs/spec/client_server/latest#authentication-types

internal/tokenutils.go

@@ -1,20 +1,10 @@
 package internal
 
 import (
-	"crypto/rand"
-	"fmt"
 	"net/http"
 	"strings"
 )
 
-// newToken returns new generated token with specified length
-func NewToken(size int) string {
-	b := make([]byte, size)
-	rand.Read(b)
-
-	return fmt.Sprintf("%x", b)
-}
-
 // getTokenFromResponse returns token from request.
 func getTokenFromResponse(r *http.Request) string {
 	const prefix = "Bearer "