big ole refactor

internal/db/paginate.go

@@ -1,8 +1,11 @@
 package db
 
 import (
+	"net/http"
 	"strings"
 
+	"git.haelnorr.com/h/golib/hws"
+	"git.haelnorr.com/h/oslstats/internal/validation"
 	"github.com/uptrace/bun"
 )
 
@@ -19,6 +22,41 @@ type OrderOpts struct {
 	Label   string
 }
 
+func GetPageOpts(s *hws.Server, w http.ResponseWriter, r *http.Request) (*PageOpts, bool) {
+	var getter validation.Getter
+	switch r.Method {
+	case "GET":
+		getter = validation.NewQueryGetter(r)
+	case "POST":
+		var ok bool
+		getter, ok = validation.ParseFormOrError(s, w, r)
+		if !ok {
+			return nil, false
+		}
+	default:
+		return nil, false
+	}
+	return getPageOpts(s, w, r, getter), true
+}
+
+func getPageOpts(s *hws.Server, w http.ResponseWriter, r *http.Request, g validation.Getter) *PageOpts {
+	page := g.Int("page").Optional().Min(1).Value
+	perPage := g.Int("per_page").Optional().Min(1).Max(100).Value
+	order := g.String("order").TrimSpace().ToUpper().Optional().AllowedValues([]string{"ASC", "DESC"}).Value
+	orderBy := g.String("order_by").TrimSpace().Optional().ToLower().Value
+	valid := g.ValidateAndError(s, w, r)
+	if !valid {
+		return nil
+	}
+	pageOpts := &PageOpts{
+		Page:    page,
+		PerPage: perPage,
+		Order:   bun.Order(order),
+		OrderBy: orderBy,
+	}
+	return pageOpts
+}
+
 func setPageOpts(q *bun.SelectQuery, p, d *PageOpts, totalitems int) (*bun.SelectQuery, *PageOpts) {
 	if p == nil {
 		p = new(PageOpts)