Checking ifModifiedSince param

api/get_indexes.go

@@ -7,11 +7,12 @@ import (
 	"github.com/karlkfi/inject"
 	"github.com/deluan/gosonic/api/responses"
 	"github.com/deluan/gosonic/consts"
+	"strconv"
 )
 
 type GetIndexesController struct {
 	beego.Controller
-	repo repositories.ArtistIndex
+	repo       repositories.ArtistIndex
 	properties repositories.Property
 }
 
@@ -21,28 +22,42 @@ func (c *GetIndexesController) Prepare() {
 }
 
 func (c *GetIndexesController) Get() {
-	indexes, err := c.repo.GetAll()
-	if err != nil {
-		beego.Error("Error retrieving Indexes:", err)
-		c.CustomAbort(200, string(responses.NewError(responses.ERROR_GENERIC, "Internal Error")))
-	}
-	res := &responses.ArtistIndex{}
+	var err error
 
-	res.LastModified, err = c.properties.Get(consts.LastScan)
+	ifModifiedSince := c.Input().Get("ifModifiedSince")
+	if ifModifiedSince == "" {
+		ifModifiedSince = "0"
+	}
+
+	res := &responses.ArtistIndex{}
+	res.IgnoredArticles = beego.AppConfig.String("ignoredArticles")
+
+	res.LastModified, err = c.properties.DefaultGet(consts.LastScan, "-1")
 	if err != nil {
 		beego.Error("Error retrieving LastScan property:", err)
 		c.CustomAbort(200, string(responses.NewError(responses.ERROR_GENERIC, "Internal Error")))
 	}
 
-	res.IgnoredArticles = beego.AppConfig.String("ignoredArticles")
-	res.Index = make([]responses.IdxIndex, len(indexes))
-	for i, idx := range indexes {
-		res.Index[i].Name = idx.Id
-		res.Index[i].Artists = make([]responses.IdxArtist, len(idx.Artists))
-		for j, a := range idx.Artists {
-			res.Index[i].Artists[j].Id = a.ArtistId
-			res.Index[i].Artists[j].Name = a.Artist
+	i, _ := strconv.Atoi(ifModifiedSince)
+	l, _ := strconv.Atoi(res.LastModified)
+
+	if (l > i) {
+		indexes, err := c.repo.GetAll()
+		if err != nil {
+			beego.Error("Error retrieving Indexes:", err)
+			c.CustomAbort(200, string(responses.NewError(responses.ERROR_GENERIC, "Internal Error")))
 		}
+
+		res.Index = make([]responses.IdxIndex, len(indexes))
+		for i, idx := range indexes {
+			res.Index[i].Name = idx.Id
+			res.Index[i].Artists = make([]responses.IdxArtist, len(idx.Artists))
+			for j, a := range idx.Artists {
+				res.Index[i].Artists[j].Id = a.ArtistId
+				res.Index[i].Artists[j].Name = a.Artist
+			}
+		}
+
 	}
 
 	c.Ctx.Output.Body(responses.NewXML(res))