Add pagination parsing to rh package

pkg/rh/paging.go

@@ -1,5 +1,7 @@
 package rh
 
+import "strconv"
+
 const (
 	PER_PAGE_DEFAULT uint = 50
 	PER_PAGE_MAX          = 200
@@ -7,10 +9,15 @@ const (
 )
 
 type (
+	// @todo this needs to be refactored to support
+	//       limit/offset params alongside page/perPage
 	PageFilter struct {
 		Page    uint `json:"page"`
 		PerPage uint `json:"perPage"`
 		Count   uint `json:"count"`
+
+		// Limit  uint `json:"limit"`
+		// Offset uint `json:"offset"`
 	}
 )
 
@@ -24,3 +31,25 @@ func Paging(page, perPage uint) PageFilter {
 		PerPage: perPage,
 	}
 }
+
+func (pf *PageFilter) ParsePagination(input interface{}) {
+	switch i := input.(type) {
+	case map[string]string:
+		if len(i["limit"]+i["offset"]) > 0 {
+			// @todo to properly & fully support limit & offset
+			//       we need to refactor pagination handling
+			limit, _ := strconv.ParseUint(i["limit"], 10, 32)
+			//offset, _ := strconv.ParseUint(i["offset"], 10, 32)
+
+			// only basic support for now due to
+			// limitation of PageFilter implementation
+			pf.PerPage = uint(limit)
+			//pf.Page = offset / limit
+		} else if len(i["page"]+i["perPage"]) > 0 {
+			page, _ := strconv.ParseUint(i["page"], 10, 32)
+			perPage, _ := strconv.ParseUint(i["perPage"], 10, 32)
+			pf.Page = uint(page)
+			pf.PerPage = uint(perPage)
+		}
+	}
+}