feat(app): add account and config components

internal/app/account_downloads.go

@@ -0,0 +1,35 @@
+package app
+
+import (
+	"context"
+	"net/http"
+	"strings"
+)
+
+func (account accountRecord) onlineOnly() bool {
+	return account.OnlineOnly && !account.Admin
+}
+
+func downloadAllowed(ctx context.Context) bool {
+	scope := sourceScope(ctx)
+	return scope == nil || !scope.OnlineOnly
+}
+
+func accountDownloadPath(path string) bool {
+	if strings.HasPrefix(path, "/api/ui/tasks/") {
+		return true
+	}
+	switch path {
+	case "/api/ui/download", "/api/ui/tasks", "/api/ui/update", "/api/ui/merge", "/api/emby/export":
+		return true
+	}
+	return false
+}
+
+func requireDownload(writer http.ResponseWriter, request *http.Request) bool {
+	if downloadAllowed(request.Context()) {
+		return true
+	}
+	writeViewerError(writer, http.StatusForbidden, "download_forbidden", "当前账号仅可在线观看，请联系管理员开通下载权限")
+	return false
+}