Implement ghost query params helpers

frontend/ghost/params.go

@@ -1,6 +1,8 @@
 package ghost
 
 import (
+	"strconv"
+
 	"github.com/valyala/fasthttp"
 )
 
@@ -8,3 +10,39 @@ import (
 type QueryParam interface {
 	Apply(headers *fasthttp.RequestHeader, args *fasthttp.Args)
 }
+
+// QueryLimit returns limit param query
+func QueryLimit(limit int) queryLimit {
+	return queryLimit{limit: limit}
+}
+
+// QueryPage returns page param query
+func QueryPage(page int) queryPage {
+	return queryPage{page: page}
+}
+
+// queryLimit implements the limit param query applier
+type queryLimit struct{ limit int }
+
+// Apply applies the limit argument to the query
+func (ql queryLimit) Apply(headers *fasthttp.RequestHeader, args *fasthttp.Args) {
+
+	if ql.limit == 0 {
+		return
+	}
+
+	args.Add("limit", strconv.Itoa(ql.limit))
+}
+
+// queryPage implements the page param query applier
+type queryPage struct{ page int }
+
+// Apply applies the page argument to the query
+func (qp queryPage) Apply(headers *fasthttp.RequestHeader, args *fasthttp.Args) {
+
+	if qp.page < 2 {
+		return
+	}
+
+	args.Add("page", strconv.Itoa(qp.page))
+}