move the storage directory outside the actual plugin code folder

src/slic3r/plugin/PluginFsUtils.cpp

@@ -632,7 +632,7 @@ void parse_metadata_rfc822(const std::string& content,
 bool is_ignored_plugin_directory(const boost::filesystem::path& path)
 {
     const std::string name = path.filename().string();
-    return name.empty() || name[0] == '.' || name.rfind("__", 0) == 0 || name == PLUGIN_SUBSCRIBED_DIR;
+    return name.empty() || name[0] == '.' || name.rfind("__", 0) == 0 || name == PLUGIN_SUBSCRIBED_DIR || name == PLUGIN_DATA_DIR;
 }
 
 bool is_safe_relative_path(const boost::filesystem::path& path)

src/slic3r/plugin/PluginFsUtils.hpp

@@ -12,6 +12,7 @@
 #include <vector>
 
 #define PLUGIN_SUBSCRIBED_DIR "_subscribed"
+#define PLUGIN_DATA_DIR "plugin_data"
 
 namespace Slic3r {
 

src/slic3r/plugin/PluginManager.cpp

@@ -486,6 +486,38 @@ bool PluginManager::try_get_plugin_descriptor_for_capability(const std::string&
     return false;
 }
 
+std::string PluginManager::get_storage_dir(const std::string& plugin_key) const
+{
+    namespace fs = boost::filesystem;
+
+    PluginDescriptor descriptor;
+    if (!try_get_plugin_descriptor(plugin_key, descriptor))
+        throw std::runtime_error("The current plugin is not registered");
+
+    const fs::path base_storage_dir = fs::path(get_orca_plugins_dir()) / PLUGIN_DATA_DIR;
+
+    if (!descriptor.is_cloud_plugin()) {
+        const fs::path local_storage_dir = base_storage_dir / plugin_key;
+        fs::create_directories(local_storage_dir);
+        return local_storage_dir.string();
+    }
+
+    auto agent = m_cloud_service.get_cloud_agent();
+    if (!agent)
+        throw std::runtime_error("Cloud plugin storage is unavailable before networking is initialized");
+
+    const std::string user_id = agent->get_user_id();
+    if (user_id.empty())
+        throw std::runtime_error("Cloud plugin storage is unavailable without a logged-in user");
+
+    if (!is_valid_plugin_id(plugin_key))
+        throw std::runtime_error("The current cloud plugin key is not a valid folder name");
+
+    const fs::path cloud_storage_dir = base_storage_dir / PLUGIN_SUBSCRIBED_DIR / user_id / plugin_key;
+    fs::create_directories(cloud_storage_dir);
+    return cloud_storage_dir.string();
+}
+
 // ── Capability instances ────────────────────────────────────────────────────────────────────
 
 std::vector<std::shared_ptr<PluginCapabilityInterface>> PluginManager::get_plugin_capabilities(const std::string& plugin_key,

src/slic3r/plugin/PluginManager.hpp

@@ -138,6 +138,10 @@ public:
     bool try_get_plugin_descriptor_for_capability(const std::string& capability_name,
                                                   PluginCapabilityType type,
                                                   PluginDescriptor& out) const;
+    // Per-plugin storage directory under orca_plugins/plugin_data, created if missing. Throws
+    // std::runtime_error if the plugin is unregistered, the key is invalid, or (cloud plugins)
+    // no user is logged in yet.
+    std::string get_storage_dir(const std::string& plugin_key) const;
 
     std::vector<std::shared_ptr<PluginCapabilityInterface>> get_plugin_capabilities(
         const std::string& plugin_key = "",                            // "" => all plugins

src/slic3r/plugin/host/PluginHost.cpp

@@ -1,9 +1,31 @@
 #include "PluginHost.hpp"
 #include "PluginHostBindings.hpp"
 #include "PluginHostUi.hpp"
+#include <slic3r/plugin/PluginAuditManager.hpp>
+#include <slic3r/plugin/PluginManager.hpp>
+
+#include <stdexcept>
 
 namespace Slic3r {
 
+namespace host_bindings {
+void register_plugin(pybind11::module_& host)
+{
+    auto plugin_host = host.def_submodule("plugin", "Plugin host API");
+
+    plugin_host.def(
+        "storage",
+        []() -> std::string {
+            const std::string plugin_key = PluginAuditManager::instance().current_plugin();
+            if (plugin_key.empty())
+                throw std::runtime_error("plugin.storage() must be called from a plugin callback");
+
+            return PluginManager::instance().get_storage_dir(plugin_key);
+        },
+        "Return the installed folder of the current plugin.");
+}
+} // namespace host_bindings
+
 void PluginHost::RegisterBindings(pybind11::module_& module)
 {
     auto host = module.def_submodule("host", "Host application API");
@@ -15,6 +37,7 @@ void PluginHost::RegisterBindings(pybind11::module_& module)
     host_bindings::register_presets(host);
     host_bindings::register_model(host);
     host_bindings::register_app(host);
+    host_bindings::register_plugin(host);
 
     // UI: native dialogs and interactive HTML windows for plugins.
     PluginHostUi::RegisterBindings(host);

src/slic3r/plugin/host/PluginHostBindings.hpp

@@ -12,5 +12,5 @@ void register_presets(pybind11::module_& host);  // PluginHostPresets.cpp
 void register_model(pybind11::module_& host);    // PluginHostModel.cpp
 void register_app(pybind11::module_& host);      // PluginHostApp.cpp
 void register_slicing(pybind11::module_& host);  // PluginHostSlicing.cpp
-
+void register_plugin(pybind11::module_& host);  // PluginHost.cpp
 } // namespace Slic3r::host_bindings