feat(api tokens): check permissions when saving

pkg/models/api_routes.go

@@ -14,14 +14,12 @@
 // You should have received a copy of the GNU Affero General Public Licensee
 // along with this program.  If not, see <https://www.gnu.org/licenses/>.
 
-package routes
+package models
 
 import (
 	"net/http"
 	"strings"
 
-	"code.vikunja.io/api/pkg/models"
-
 	"github.com/labstack/echo/v4"
 )
 
@@ -64,8 +62,8 @@ func getRouteGroupName(path string) string {
 	}
 }
 
-// collectRoutesForAPITokenUsage gets called for every added APITokenRoute and builds a list of all routes we can use for the api tokens.
-func collectRoutesForAPITokenUsage(route echo.Route) {
+// CollectRoutesForAPITokenUsage gets called for every added APITokenRoute and builds a list of all routes we can use for the api tokens.
+func CollectRoutesForAPITokenUsage(route echo.Route) {
 
 	if !strings.Contains(route.Name, "(*WebHandler)") {
 		return
@@ -130,7 +128,7 @@ func GetAvailableAPIRoutesForToken(c echo.Context) error {
 }
 
 // CanDoAPIRoute checks if a token is allowed to use the current api route
-func CanDoAPIRoute(c echo.Context, token *models.APIToken) (can bool) {
+func CanDoAPIRoute(c echo.Context, token *APIToken) (can bool) {
 	routeGroupName := getRouteGroupName(c.Path())
 
 	group, hasGroup := token.Permissions[routeGroupName]
@@ -168,3 +166,50 @@ func CanDoAPIRoute(c echo.Context, token *models.APIToken) (can bool) {
 
 	return false
 }
+
+func PermissionsAreValid(permissions APIPermissions) (err error) {
+
+	for key, methods := range permissions {
+		routes, has := apiTokenRoutes[key]
+		if !has {
+			return &ErrInvalidAPITokenPermission{
+				Group: key,
+			}
+		}
+
+		for _, method := range methods {
+			if method == "create" && routes.Create == nil {
+				return &ErrInvalidAPITokenPermission{
+					Group:      key,
+					Permission: method,
+				}
+			}
+			if method == "read_one" && routes.ReadOne == nil {
+				return &ErrInvalidAPITokenPermission{
+					Group:      key,
+					Permission: method,
+				}
+			}
+			if method == "read_all" && routes.ReadAll == nil {
+				return &ErrInvalidAPITokenPermission{
+					Group:      key,
+					Permission: method,
+				}
+			}
+			if method == "update" && routes.Update == nil {
+				return &ErrInvalidAPITokenPermission{
+					Group:      key,
+					Permission: method,
+				}
+			}
+			if method == "delete" && routes.Delete == nil {
+				return &ErrInvalidAPITokenPermission{
+					Group:      key,
+					Permission: method,
+				}
+			}
+		}
+	}
+
+	return nil
+}

pkg/models/api_tokens.go

@@ -102,7 +102,9 @@ func (t *APIToken) Create(s *xorm.Session, a web.Auth) (err error) {
 
 	t.OwnerID = a.GetID()
 
-	// TODO: validate permissions
+	if err := PermissionsAreValid(t.Permissions); err != nil {
+		return err
+	}
 
 	_, err = s.Insert(t)
 	return err

pkg/models/error.go

@@ -1685,3 +1685,31 @@ func (err ErrAPITokenInvalid) HTTPError() web.HTTPError {
 		Message:  "The provided api token is invalid.",
 	}
 }
+
+// ErrInvalidAPITokenPermission represents an error where an api token is invalid
+type ErrInvalidAPITokenPermission struct {
+	Group      string
+	Permission string
+}
+
+// IsErrInvalidAPITokenPermission checks if an error is ErrInvalidAPITokenPermission.
+func IsErrInvalidAPITokenPermission(err error) bool {
+	_, ok := err.(*ErrInvalidAPITokenPermission)
+	return ok
+}
+
+func (err *ErrInvalidAPITokenPermission) Error() string {
+	return fmt.Sprintf("API token permission %s of group %s is invalid", err.Permission, err.Group)
+}
+
+// ErrCodeInvalidAPITokenPermission holds the unique world-error code of this error
+const ErrCodeInvalidAPITokenPermission = 14002
+
+// HTTPError holds the http error description
+func (err ErrInvalidAPITokenPermission) HTTPError() web.HTTPError {
+	return web.HTTPError{
+		HTTPCode: http.StatusBadRequest,
+		Code:     ErrCodeInvalidAPITokenPermission,
+		Message:  fmt.Sprintf("The permission %s of group %s is invalid.", err.Permission, err.Group),
+	}
+}

pkg/routes/routes.go

@@ -204,7 +204,7 @@ func RegisterRoutes(e *echo.Echo) {
 	// API Routes
 	a := e.Group("/api/v1")
 	e.OnAddRouteHandler = func(host string, route echo.Route, handler echo.HandlerFunc, middleware []echo.MiddlewareFunc) {
-		collectRoutesForAPITokenUsage(route)
+		models.CollectRoutesForAPITokenUsage(route)
 	}
 	registerAPIRoutes(a)
 }
@@ -316,7 +316,7 @@ func registerAPIRoutes(a *echo.Group) {
 				return echo.NewHTTPError(http.StatusUnauthorized)
 			}
 
-			if !CanDoAPIRoute(c, token) {
+			if !models.CanDoAPIRoute(c, token) {
 				return echo.NewHTTPError(http.StatusUnauthorized)
 			}
 
@@ -333,7 +333,7 @@ func registerAPIRoutes(a *echo.Group) {
 	setupMetricsMiddleware(a)
 
 	a.POST("/tokenTest", apiv1.CheckToken)
-	a.GET("/routes", GetAvailableAPIRoutesForToken)
+	a.GET("/routes", models.GetAvailableAPIRoutesForToken)
 
 	// User stuff
 	u := a.Group("/user")