app-ethereum/src_nbgl/ui_sign_message.c

#include <nbgl_page.h>
#include "shared_context.h"
#include "ui_callbacks.h"
#include "ui_nbgl.h"
#include "sign_message.h"
#include "glyphs.h"
#include "nbgl_use_case.h"
#include "common_ui.h"
#include "ui_message_signing.h"
#include "ui_signing.h"

#define TEXT_REVIEW_EIP191 REVIEW(TEXT_MESSAGE)
#define TEXT_SIGN_EIP191   SIGN(TEXT_MESSAGE)

typedef enum {
    UI_191_ACTION_IDLE = 0,
    UI_191_ACTION_ADVANCE_IN_MESSAGE,
    UI_191_ACTION_GO_TO_SIGN
} e_ui_191_action;

static e_ui_191_action g_action;

static bool skip_message;

static nbgl_layoutTagValue_t pair;

static uint32_t eip191MessageIdx = 0;
static uint32_t stringsTmpTmpIdx = 0;

static void reject_message(void) {
    io_seproxyhal_touch_signMessage_cancel();
}

static void sign_message(void) {
    io_seproxyhal_touch_signMessage_ok();
}

static bool display_message(nbgl_pageContent_t *content) {
    uint16_t len = 0;
    bool reached;

    if (g_action == UI_191_ACTION_ADVANCE_IN_MESSAGE) {
        strncpy(g_stax_shared_buffer + eip191MessageIdx,
                strings.tmp.tmp + stringsTmpTmpIdx,
                SHARED_BUFFER_SIZE - eip191MessageIdx);
        reached = nbgl_getTextMaxLenInNbLines(BAGL_FONT_INTER_MEDIUM_32px,
                                              (char *) g_stax_shared_buffer,
                                              SCREEN_WIDTH - (2 * BORDER_MARGIN),
                                              NB_MAX_LINES_IN_REVIEW,
                                              &len);

        stringsTmpTmpIdx = len - eip191MessageIdx;
        eip191MessageIdx = len;
        g_stax_shared_buffer[eip191MessageIdx] = '\0';

        if (!reached && eip191MessageIdx < SHARED_BUFFER_SIZE) {
            stringsTmpTmpIdx = 0;
            question_switcher();

            if (g_action != UI_191_ACTION_GO_TO_SIGN) {
                return false;
            }
        } else if (reached || eip191MessageIdx == SHARED_BUFFER_SIZE) {
            eip191MessageIdx = 0;
        }
    }

    pair.value = g_stax_shared_buffer;
    pair.item = "Message";
    content->type = TAG_VALUE_LIST;
    content->tagValueList.nbPairs = 1;
    content->tagValueList.pairs = &pair;
    content->tagValueList.smallCaseForValue = false;
    content->tagValueList.nbMaxLinesForValue = NB_MAX_LINES_IN_REVIEW;
    content->tagValueList.wrapping = false;

    if ((g_action != UI_191_ACTION_IDLE) && (stringsTmpTmpIdx >= strlen(strings.tmp.tmp))) {
        // Fetch the next content to display into strings.tmp.tmp buffer.
        stringsTmpTmpIdx = 0;
        question_switcher();
    }
    return true;
}

static bool display_sign(nbgl_pageContent_t *content) {
    bool ret = false;

    if (g_position != UI_SIGNING_POSITION_SIGN) {
        content->type = INFO_LONG_PRESS, content->infoLongPress.icon = &C_Message_64px;
        content->infoLongPress.text = TEXT_SIGN_EIP191;
        content->infoLongPress.longPressText = SIGN_BUTTON;
        g_position = UI_SIGNING_POSITION_SIGN;
        ret = true;
    }
    return ret;
}

static bool nav_callback(uint8_t page, nbgl_pageContent_t *content) {
    bool ret = true;

    if (page == LAST_PAGE_FOR_REVIEW) {  // was skipped
        skip_message = true;
        skip_rest_of_message();
    }
    if ((g_action != UI_191_ACTION_GO_TO_SIGN) && (g_position != UI_SIGNING_POSITION_SIGN)) {
        if (skip_message) {
            // do not refresh when this callback triggers after user validation
            ret = false;
        } else {
            ret = display_message(content);
        }
    } else {
        // the last page must contain a long press button
        ret = display_sign(content);
    }
    return ret;
}

static void continue_review(void) {
    nbgl_useCaseForwardOnlyReview(REJECT_BUTTON, NULL, nav_callback, ui_message_review_choice);
}

void ui_191_start(void) {
    g_position = UI_SIGNING_POSITION_START;

    skip_message = false;
    eip191MessageIdx = 0;
    stringsTmpTmpIdx = 0;

    ui_message_start(TEXT_REVIEW_EIP191, &ui_191_switch_to_message, &sign_message, &reject_message);
}

void ui_191_switch_to_message(void) {
    g_position = UI_SIGNING_POSITION_REVIEW;
    g_action = UI_191_ACTION_ADVANCE_IN_MESSAGE;
    // No question mechanism on Stax:
    // Message is already displayed
    continue_review();
}

void ui_191_switch_to_sign(void) {
    g_action = UI_191_ACTION_GO_TO_SIGN;
    // Next nav_callback callback must display
    // the hold to approve screen
    if (skip_message) {
        continue_review();  // to force screen refresh
    }
}

void ui_191_switch_to_question(void) {
    // No question mechanism on Stax:
    // Always display the next message chunk.
    continue_displaying_message();
}