fix cloud library mounts and artwork caching

internal/service/public_url.go

@@ -0,0 +1,49 @@
+package service
+
+import (
+	"context"
+	"net/url"
+	"strings"
+
+	"github.com/ShukeBta/MediaStationGo/internal/config"
+	"github.com/ShukeBta/MediaStationGo/internal/repository"
+)
+
+// PublicServerURL returns the operator-configured public MediaStationGo base
+// URL. It is intentionally read from Setting first so Docker users only need to
+// fill one domain in the admin settings page after deployment.
+func PublicServerURL(ctx context.Context, repo *repository.Container, cfg *config.Config) string {
+	for _, key := range []string{"app.server_url", "server.url", "public.server_url", "strm.base_url"} {
+		if repo != nil && repo.Setting != nil {
+			if value, err := repo.Setting.Get(ctx, key); err == nil && strings.TrimSpace(value) != "" {
+				return strings.TrimRight(strings.TrimSpace(value), "/")
+			}
+		}
+	}
+	if cfg != nil && strings.TrimSpace(cfg.App.ServerURL) != "" {
+		return strings.TrimRight(strings.TrimSpace(cfg.App.ServerURL), "/")
+	}
+	return ""
+}
+
+// BuildPublicAPIURL builds an API URL. Without a public base it returns a
+// relative same-origin URL; with a configured domain it returns an absolute URL.
+func BuildPublicAPIURL(ctx context.Context, repo *repository.Container, cfg *config.Config, apiPath string, query url.Values) string {
+	apiPath = "/" + strings.TrimLeft(strings.TrimSpace(apiPath), "/")
+	if query != nil && len(query) > 0 {
+		apiPath += "?" + query.Encode()
+	}
+	base := PublicServerURL(ctx, repo, cfg)
+	if base == "" {
+		return apiPath
+	}
+	u, err := url.Parse(base)
+	if err != nil || u.Scheme == "" || u.Host == "" {
+		return apiPath
+	}
+	u.Path = strings.TrimRight(u.Path, "/") + "/" + strings.TrimLeft(strings.Split(apiPath, "?")[0], "/")
+	if query != nil && len(query) > 0 {
+		u.RawQuery = query.Encode()
+	}
+	return u.String()
+}