1 files changed, 31 insertions, 0 deletions
diff --git a/vendor/github.com/vektah/gqlparser/validator/rules/known_directives.go b/vendor/github.com/vektah/gqlparser/validator/rules/known_directives.go
new file mode 100644
index 00000000..dc4353ef
--- /dev/null
+++ b/vendor/github.com/vektah/gqlparser/validator/rules/known_directives.go
@@ -0,0 +1,31 @@
+package validator
+
+import (
+	"github.com/vektah/gqlparser/ast"
+	. "github.com/vektah/gqlparser/validator"
+)
+
+func init() {
+	AddRule("KnownDirectives", func(observers *Events, addError AddErrFunc) {
+		observers.OnDirective(func(walker *Walker, directive *ast.Directive) {
+			if directive.Definition == nil {
+				addError(
+					Message(`Unknown directive "%s".`, directive.Name),
+					At(directive.Position),
+				)
+				return
+			}
+
+			for _, loc := range directive.Definition.Locations {
+				if loc == directive.Location {
+					return
+				}
+			}
+
+			addError(
+				Message(`Directive "%s" may not be used on %s.`, directive.Name, directive.Location),
+				At(directive.Position),
+			)
+		})
+	})
+}