Backend: Migrate to using non-global configuration (#31856)

Signed-off-by: Arve Knudsen <arve.knudsen@gmail.com>

pkg/api/avatar/avatar.go

@@ -69,6 +69,7 @@ func (a *Avatar) Update() (err error) {
 }
 
 type CacheServer struct {
+	cfg      *setting.Cfg
 	notFound *Avatar
 	cache    *gocache.Cache
 }
@@ -109,7 +110,7 @@ func (a *CacheServer) Handler(ctx *models.ReqContext) {
 
 	ctx.Resp.Header().Set("Content-Type", "image/jpeg")
 
-	if !setting.EnableGzip {
+	if !a.cfg.EnableGzip {
 		ctx.Resp.Header().Set("Content-Length", strconv.Itoa(len(avatar.data.Bytes())))
 	}
 
@@ -121,21 +122,22 @@ func (a *CacheServer) Handler(ctx *models.ReqContext) {
 	}
 }
 
-func NewCacheServer() *CacheServer {
+func NewCacheServer(cfg *setting.Cfg) *CacheServer {
 	return &CacheServer{
-		notFound: newNotFound(),
+		cfg:      cfg,
+		notFound: newNotFound(cfg),
 		cache:    gocache.New(time.Hour, time.Hour*2),
 	}
 }
 
-func newNotFound() *Avatar {
+func newNotFound(cfg *setting.Cfg) *Avatar {
 	avatar := &Avatar{notFound: true}
 
 	// load user_profile png into buffer
 	// It's safe to ignore gosec warning G304 since the variable part of the file path comes from a configuration
 	// variable.
 	// nolint:gosec
-	path := filepath.Join(setting.StaticRootPath, "img", "user_profile.png")
+	path := filepath.Join(cfg.StaticRootPath, "img", "user_profile.png")
 	// It's safe to ignore gosec warning G304 since the variable part of the file path comes from a configuration
 	// variable.
 	// nolint:gosec