[FL-2226] BadUSB, U2F: missing assets error (#979)

* badusb, u2f: showing error screen if assets are missing
* BadUsb: remove dead code
* U2F: remove dead code

Co-authored-by: Aleksandr Kutuzov <alleteam@gmail.com>

applications/u2f/scenes/u2f_scene_config.h

@@ -1 +1,2 @@
 ADD_SCENE(u2f, main, Main)
+ADD_SCENE(u2f, error, Error)

applications/u2f/scenes/u2f_scene_error.c

@@ -0,0 +1,49 @@
+#include "../u2f_app_i.h"
+
+static void u2f_scene_error_event_callback(GuiButtonType result, InputType type, void* context) {
+    furi_assert(context);
+    U2fApp* app = context;
+
+    if((result == GuiButtonTypeLeft) && (type == InputTypeShort)) {
+        view_dispatcher_send_custom_event(app->view_dispatcher, U2fCustomEventErrorBack);
+    }
+}
+
+void u2f_scene_error_on_enter(void* context) {
+    U2fApp* app = context;
+
+    widget_add_icon_element(app->widget, 0, 0, &I_SDQuestion_35x43);
+
+    widget_add_string_multiline_element(
+        app->widget,
+        81,
+        4,
+        AlignCenter,
+        AlignTop,
+        FontSecondary,
+        "No SD card or\napp data found.\nThis app will not\nwork without\nrequired files.");
+
+    widget_add_button_element(
+        app->widget, GuiButtonTypeLeft, "Back", u2f_scene_error_event_callback, app);
+
+    view_dispatcher_switch_to_view(app->view_dispatcher, U2fAppViewError);
+}
+
+bool u2f_scene_error_on_event(void* context, SceneManagerEvent event) {
+    U2fApp* app = context;
+    bool consumed = false;
+
+    if(event.type == SceneManagerEventTypeCustom) {
+        if(event.event == U2fCustomEventErrorBack) {
+            view_dispatcher_stop(app->view_dispatcher);
+            consumed = true;
+        }
+    }
+
+    return consumed;
+}
+
+void u2f_scene_error_on_exit(void* context) {
+    U2fApp* app = context;
+    widget_clear(app->widget);
+}

applications/u2f/u2f_app.c

@@ -1,4 +1,5 @@
 #include "u2f_app_i.h"
+#include "u2f_data.h"
 #include <furi.h>
 #include <furi_hal.h>
 
@@ -39,11 +40,19 @@ U2fApp* u2f_app_alloc() {
 
     view_dispatcher_attach_to_gui(app->view_dispatcher, app->gui, ViewDispatcherTypeFullscreen);
 
+    // Custom Widget
+    app->widget = widget_alloc();
+    view_dispatcher_add_view(app->view_dispatcher, U2fAppViewError, widget_get_view(app->widget));
+
     app->u2f_view = u2f_view_alloc();
     view_dispatcher_add_view(
         app->view_dispatcher, U2fAppViewMain, u2f_view_get_view(app->u2f_view));
 
-    scene_manager_next_scene(app->scene_manager, U2fAppViewMain);
+    if(u2f_data_check()) {
+        scene_manager_next_scene(app->scene_manager, U2fSceneMain);
+    } else {
+        scene_manager_next_scene(app->scene_manager, U2fSceneError);
+    }
 
     return app;
 }
@@ -55,6 +64,10 @@ void u2f_app_free(U2fApp* app) {
     view_dispatcher_remove_view(app->view_dispatcher, U2fAppViewMain);
     u2f_view_free(app->u2f_view);
 
+    // Custom Widget
+    view_dispatcher_remove_view(app->view_dispatcher, U2fAppViewError);
+    widget_free(app->widget);
+
     // View dispatcher
     view_dispatcher_free(app->view_dispatcher);
     scene_manager_free(app->scene_manager);

applications/u2f/u2f_app_i.h

@@ -10,6 +10,7 @@
 #include <dialogs/dialogs.h>
 #include <notification/notification_messages.h>
 #include <gui/modules/variable_item_list.h>
+#include <gui/modules/widget.h>
 #include "views/u2f_view.h"
 #include "u2f_hid.h"
 #include "u2f.h"
@@ -29,9 +30,12 @@ typedef enum {
 
     U2fCustomEventConfirm,
 
+    U2fCustomEventErrorBack,
+
 } GpioCustomEvent;
 
 typedef enum {
+    U2fAppViewError,
     U2fAppViewMain,
 } U2fAppView;
 
@@ -40,6 +44,7 @@ struct U2fApp {
     ViewDispatcher* view_dispatcher;
     SceneManager* scene_manager;
     NotificationApp* notifications;
+    Widget* widget;
     osTimerId_t timer;
     U2fHid* u2f_hid;
     U2fView* u2f_view;

applications/u2f/u2f_data.c

@@ -38,6 +38,26 @@ typedef struct {
     uint32_t control;
 } __attribute__((packed)) U2fCounterData;
 
+bool u2f_data_check() {
+    bool state = false;
+    Storage* fs_api = furi_record_open("storage");
+    File* file = storage_file_alloc(fs_api);
+
+    if(storage_file_open(file, U2F_CERT_FILE, FSAM_READ, FSOM_OPEN_EXISTING)) {
+        storage_file_close(file);
+        if(storage_file_open(file, U2F_CERT_KEY_FILE, FSAM_READ, FSOM_OPEN_EXISTING)) {
+            state = true;
+        }
+    }
+
+    storage_file_close(file);
+    storage_file_free(file);
+
+    furi_record_close("storage");
+
+    return state;
+}
+
 bool u2f_data_cert_check() {
     bool state = false;
     Storage* fs_api = furi_record_open("storage");

applications/u2f/u2f_data.h

@@ -6,6 +6,8 @@ extern "C" {
 
 #include <furi.h>
 
+bool u2f_data_check();
+
 bool u2f_data_cert_check();
 
 uint32_t u2f_data_cert_load(uint8_t* cert);

applications/u2f/views/u2f_view.c

@@ -39,7 +39,7 @@ static void u2f_view_draw_callback(Canvas* canvas, void* _model) {
             canvas, 128 / 2, 3, AlignCenter, AlignTop, "Authentication successfull!");
     } else if(model->display_msg == U2fMsgError) {
         canvas_draw_icon(canvas, 22, 15, &I_Error_62x31);
-        canvas_draw_str_aligned(canvas, 128 / 2, 3, AlignCenter, AlignTop, "Ceritficate missing");
+        canvas_draw_str_aligned(canvas, 128 / 2, 3, AlignCenter, AlignTop, "Ceritficate error");
     }
 }