ch9.2-9.3

internal/data/filters.go

@@ -0,0 +1,19 @@
+package data
+
+import "gitea.local.lab/Lbenedar/greenlight/internal/validator"
+
+type Filters struct {
+	Page         int
+	PageSize     int
+	Sort         string
+	SortSafelist []string
+}
+
+func ValidateFilters(v *validator.Validator, f Filters) {
+	v.Check(f.Page > 0, "page", "must be greater than zero")
+	v.Check(f.Page <= 10_000_000, "page", "must be a maximum of 10 million")
+	v.Check(f.PageSize > 0, "page_size", "must be greater than zero")
+	v.Check(f.PageSize <= 100, "page_size", "must be a maximum of 100")
+
+	v.Check(validator.PermittedValue(f.Sort, f.SortSafelist...), "sort", "invalid sort values")
+}