Momentum-Apps/scenes/generate_token/totp_scene_generate_token.c

#include <gui/gui.h>
#include <notification/notification.h>
#include <notification/notification_messages.h>
#include <totp_icons.h>
#include "totp_scene_generate_token.h"
#include "../../types/token_info.h"
#include "../../types/common.h"
#include "../../services/ui/constants.h"
#include "../../services/totp/totp.h"
#include "../../services/config/config.h"
#include "../../services/crypto/crypto.h"
#include "../../services/crypto/memset_s.h"
#include "../../services/roll_value/roll_value.h"
#include "../scene_director.h"
#include "../token_menu/totp_scene_token_menu.h"
#include "../../services/hid_worker/hid_worker.h"

#define TOKEN_LIFETIME 30
#define DIGIT_TO_CHAR(digit) ((digit) + '0')

typedef struct {
    uint16_t current_token_index;
    char last_code[TOTP_TOKEN_DIGITS_MAX_COUNT + 1];
    char* last_code_name;
    bool need_token_update;
    uint32_t last_token_gen_time;
    TotpHidWorkerTypeContext* hid_worker_context;
} SceneState;

static const NotificationSequence notification_sequence_new_token = {
    &message_display_backlight_on,
    &message_green_255,
    &message_vibro_on,
    &message_note_c5,
    &message_delay_50,
    &message_vibro_off,
    &message_sound_off,
    NULL,
};

static const NotificationSequence notification_sequence_badusb = {
    &message_vibro_on,
    &message_note_d5,
    &message_delay_50,
    &message_note_e4,
    &message_delay_50,
    &message_note_f3,
    &message_delay_50,
    &message_vibro_off,
    &message_sound_off,
    NULL,
};

static void i_token_to_str(uint32_t i_token_code, char* str, TokenDigitsCount len) {
    uint8_t str_token_length = 0;
    if(len == TOTP_8_DIGITS) {
        str[8] = '\0';
        str_token_length = 8;
    } else if(len == TOTP_6_DIGITS) {
        str[6] = '\0';
        str_token_length = 6;
    }

    if(i_token_code == OTP_ERROR) {
        memset(&str[0], '-', str_token_length);
    } else {
        if(len == TOTP_8_DIGITS) {
            str[7] = DIGIT_TO_CHAR(i_token_code % 10);
            str[6] = DIGIT_TO_CHAR((i_token_code = i_token_code / 10) % 10);
            str[5] = DIGIT_TO_CHAR((i_token_code = i_token_code / 10) % 10);
        } else if(len == TOTP_6_DIGITS) {
            str[5] = DIGIT_TO_CHAR(i_token_code % 10);
        }

        str[4] = DIGIT_TO_CHAR((i_token_code = i_token_code / 10) % 10);
        str[3] = DIGIT_TO_CHAR((i_token_code = i_token_code / 10) % 10);
        str[2] = DIGIT_TO_CHAR((i_token_code = i_token_code / 10) % 10);
        str[1] = DIGIT_TO_CHAR((i_token_code = i_token_code / 10) % 10);
        str[0] = DIGIT_TO_CHAR((i_token_code = i_token_code / 10) % 10);
    }
}

TOTP_ALGO get_totp_algo_impl(TokenHashAlgo algo) {
    switch(algo) {
    case SHA1:
        return TOTP_ALGO_SHA1;
    case SHA256:
        return TOTP_ALGO_SHA256;
    case SHA512:
        return TOTP_ALGO_SHA512;
    default:
        break;
    }

    return NULL;
}

void update_totp_params(PluginState* const plugin_state) {
    SceneState* scene_state = (SceneState*)plugin_state->current_scene_state;

    if(scene_state->current_token_index < plugin_state->tokens_count) {
        TokenInfo* tokenInfo =
            list_element_at(plugin_state->tokens_list, scene_state->current_token_index)->data;

        scene_state->need_token_update = true;
        scene_state->last_code_name = tokenInfo->name;
    }
}

void totp_scene_generate_token_init(const PluginState* plugin_state) {
    UNUSED(plugin_state);
}

void totp_scene_generate_token_activate(
    PluginState* plugin_state,
    const GenerateTokenSceneContext* context) {
    if(!plugin_state->token_list_loaded) {
        TokenLoadingResult token_load_result = totp_config_file_load_tokens(plugin_state);
        if(token_load_result != TokenLoadingResultSuccess) {
            DialogMessage* message = dialog_message_alloc();
            dialog_message_set_buttons(message, NULL, "Okay", NULL);
            if(token_load_result == TokenLoadingResultWarning) {
                dialog_message_set_text(
                    message,
                    "Unable to load some tokens\nPlease review conf file",
                    SCREEN_WIDTH_CENTER,
                    SCREEN_HEIGHT_CENTER,
                    AlignCenter,
                    AlignCenter);
            } else if(token_load_result == TokenLoadingResultError) {
                dialog_message_set_text(
                    message,
                    "Unable to load tokens\nPlease review conf file",
                    SCREEN_WIDTH_CENTER,
                    SCREEN_HEIGHT_CENTER,
                    AlignCenter,
                    AlignCenter);
            }

            dialog_message_show(plugin_state->dialogs, message);
            dialog_message_free(message);
        }
    }
    SceneState* scene_state = malloc(sizeof(SceneState));
    furi_check(scene_state != NULL);
    if(context == NULL || context->current_token_index > plugin_state->tokens_count) {
        scene_state->current_token_index = 0;
    } else {
        scene_state->current_token_index = context->current_token_index;
    }
    scene_state->need_token_update = true;
    plugin_state->current_scene_state = scene_state;
    FURI_LOG_D(LOGGING_TAG, "Timezone set to: %f", (double)plugin_state->timezone_offset);
    update_totp_params(plugin_state);
    scene_state->hid_worker_context = totp_hid_worker_start();
    scene_state->hid_worker_context->string = &scene_state->last_code[0];
    scene_state->hid_worker_context->string_length = TOTP_TOKEN_DIGITS_MAX_COUNT + 1;
}

void totp_scene_generate_token_render(Canvas* const canvas, PluginState* plugin_state) {
    if(plugin_state->tokens_count == 0) {
        canvas_draw_str_aligned(
            canvas,
            SCREEN_WIDTH_CENTER,
            SCREEN_HEIGHT_CENTER - 10,
            AlignCenter,
            AlignCenter,
            "Token list is empty");
        canvas_draw_str_aligned(
            canvas,
            SCREEN_WIDTH_CENTER,
            SCREEN_HEIGHT_CENTER + 10,
            AlignCenter,
            AlignCenter,
            "Press OK button to add");
        return;
    }

    SceneState* scene_state = (SceneState*)plugin_state->current_scene_state;
    FuriHalRtcDateTime curr_dt;
    furi_hal_rtc_get_datetime(&curr_dt);
    uint32_t curr_ts = furi_hal_rtc_datetime_to_timestamp(&curr_dt);

    bool is_new_token_time = curr_ts % TOKEN_LIFETIME == 0;
    if(is_new_token_time && scene_state->last_token_gen_time != curr_ts) {
        scene_state->need_token_update = true;
    }

    if(scene_state->need_token_update) {
        scene_state->need_token_update = false;
        scene_state->last_token_gen_time = curr_ts;

        const TokenInfo* tokenInfo =
            (TokenInfo*)(list_element_at(
                             plugin_state->tokens_list, scene_state->current_token_index)
                             ->data);

        if(tokenInfo->token != NULL && tokenInfo->token_length > 0) {
            furi_mutex_acquire(scene_state->hid_worker_context->string_sync, FuriWaitForever);
            size_t key_length;
            uint8_t* key = totp_crypto_decrypt(
                tokenInfo->token, tokenInfo->token_length, &plugin_state->iv[0], &key_length);

            i_token_to_str(
                totp_at(
                    get_totp_algo_impl(tokenInfo->algo),
                    token_info_get_digits_count(tokenInfo),
                    key,
                    key_length,
                    curr_ts,
                    plugin_state->timezone_offset,
                    TOKEN_LIFETIME),
                scene_state->last_code,
                tokenInfo->digits);
            memset_s(key, key_length, 0, key_length);
            free(key);
        } else {
            furi_mutex_acquire(scene_state->hid_worker_context->string_sync, FuriWaitForever);
            i_token_to_str(0, scene_state->last_code, tokenInfo->digits);
        }

        furi_mutex_release(scene_state->hid_worker_context->string_sync);

        if(is_new_token_time) {
            notification_message(plugin_state->notification, &notification_sequence_new_token);
        }
    }

    canvas_set_font(canvas, FontPrimary);
    uint16_t token_name_width = canvas_string_width(canvas, scene_state->last_code_name);
    if(SCREEN_WIDTH - token_name_width > 18) {
        canvas_draw_str_aligned(
            canvas,
            SCREEN_WIDTH_CENTER,
            SCREEN_HEIGHT_CENTER - 20,
            AlignCenter,
            AlignCenter,
            scene_state->last_code_name);
    } else {
        canvas_draw_str_aligned(
            canvas,
            9,
            SCREEN_HEIGHT_CENTER - 20,
            AlignLeft,
            AlignCenter,
            scene_state->last_code_name);
        canvas_set_color(canvas, ColorWhite);
        canvas_draw_box(canvas, 0, SCREEN_HEIGHT_CENTER - 24, 9, 9);
        canvas_draw_box(canvas, SCREEN_WIDTH - 10, SCREEN_HEIGHT_CENTER - 24, 9, 9);
        canvas_set_color(canvas, ColorBlack);
    }

    canvas_set_font(canvas, FontBigNumbers);
    canvas_draw_str_aligned(
        canvas,
        SCREEN_WIDTH_CENTER,
        SCREEN_HEIGHT_CENTER,
        AlignCenter,
        AlignCenter,
        scene_state->last_code);

    const uint8_t BAR_MARGIN = 3;
    const uint8_t BAR_HEIGHT = 4;
    float percentDone = (float)(TOKEN_LIFETIME - curr_ts % TOKEN_LIFETIME) / (float)TOKEN_LIFETIME;
    uint8_t barWidth = (uint8_t)((float)(SCREEN_WIDTH - (BAR_MARGIN << 1)) * percentDone);
    uint8_t barX = ((SCREEN_WIDTH - (BAR_MARGIN << 1) - barWidth) >> 1) + BAR_MARGIN;

    canvas_draw_box(canvas, barX, SCREEN_HEIGHT - BAR_MARGIN - BAR_HEIGHT, barWidth, BAR_HEIGHT);

    if(plugin_state->tokens_count > 1) {
        canvas_draw_icon(canvas, 0, SCREEN_HEIGHT_CENTER - 24, &I_totp_arrow_left_8x9);
        canvas_draw_icon(
            canvas, SCREEN_WIDTH - 9, SCREEN_HEIGHT_CENTER - 24, &I_totp_arrow_right_8x9);
    }
}

bool totp_scene_generate_token_handle_event(
    const PluginEvent* const event,
    PluginState* plugin_state) {
    if(event->type != EventTypeKey) {
        return true;
    }

    if(event->input.type == InputTypeLong && event->input.key == InputKeyBack) {
        return false;
    }

    SceneState* scene_state;
    if(event->input.type == InputTypeLong && event->input.key == InputKeyDown) {
        scene_state = (SceneState*)plugin_state->current_scene_state;
        totp_hid_worker_notify(scene_state->hid_worker_context, TotpHidWorkerEvtType);
        notification_message(plugin_state->notification, &notification_sequence_badusb);
        return true;
    }

    if(event->input.type != InputTypePress) {
        return true;
    }

    scene_state = (SceneState*)plugin_state->current_scene_state;
    switch(event->input.key) {
    case InputKeyUp:
        break;
    case InputKeyDown:
        break;
    case InputKeyRight:
        totp_roll_value_uint16_t(
            &scene_state->current_token_index,
            1,
            0,
            plugin_state->tokens_count - 1,
            RollOverflowBehaviorRoll);
        update_totp_params(plugin_state);
        break;
    case InputKeyLeft:
        totp_roll_value_uint16_t(
            &scene_state->current_token_index,
            -1,
            0,
            plugin_state->tokens_count - 1,
            RollOverflowBehaviorRoll);
        update_totp_params(plugin_state);
        break;
    case InputKeyOk:
        if(plugin_state->tokens_count == 0) {
            totp_scene_director_activate_scene(plugin_state, TotpSceneTokenMenu, NULL);
        } else {
            TokenMenuSceneContext ctx = {.current_token_index = scene_state->current_token_index};
            totp_scene_director_activate_scene(plugin_state, TotpSceneTokenMenu, &ctx);
        }
        break;
    case InputKeyBack:
        break;
    default:
        break;
    }

    return true;
}

void totp_scene_generate_token_deactivate(PluginState* plugin_state) {
    if(plugin_state->current_scene_state == NULL) return;
    SceneState* scene_state = (SceneState*)plugin_state->current_scene_state;

    totp_hid_worker_stop(scene_state->hid_worker_context);

    free(scene_state);
    plugin_state->current_scene_state = NULL;
}

void totp_scene_generate_token_free(const PluginState* plugin_state) {
    UNUSED(plugin_state);
}