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message.rs
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message.rs
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#![allow(clippy::missing_safety_doc)]
use super::{error::ParserError, transaction::Transaction};
use crate::{
bolos::c_zemu_log_stack,
check_canary,
zxformat::{pageString, Writer},
};
use core::fmt::Write;
use core::mem::ManuallyDrop;
// The lenght of \x19Stacks Signed Message:
const BYTE_STRING_HEADER_LEN: usize = "\x19Stacks Signed Message:\n".as_bytes().len();
// The max number of characters we are going to show on the screen
const MAX_CHARS_TO_SHOW_FROM_MSG: usize = 60;
// We chose an union as later new
// message types may be added
// safety: this is memory allocated in C and last the application lifetime
// and is initialized once. It is the C-side responsability to free the memory. that's why
// we use repr(C) key word
#[repr(C)]
pub union Message<'a> {
// leave room for another structured data
bstr: ByteString<'a>,
}
impl<'a> Message<'a> {
pub fn from_bytes(data: &'a [u8]) -> Result<Self, ParserError> {
let byte_str = ByteString::from_bytes(data)?;
Ok(Self { bstr: byte_str })
}
pub fn read(&mut self, data: &'a [u8]) -> Result<(), ParserError> {
let bstr = ByteString::from_bytes(data)?;
self.bstr = bstr;
Ok(())
}
pub fn is_message(data: &'a [u8]) -> bool {
ByteString::maybe_byte_string(data)
}
pub fn num_items(&self) -> Result<u8, ParserError> {
unsafe { self.bstr.num_items() }
}
pub fn get_item(
&mut self,
display_idx: u8,
out_key: &mut [u8],
out_value: &mut [u8],
page_idx: u8,
) -> Result<u8, ParserError> {
unsafe {
self.bstr
.get_item(display_idx, out_key, out_value, page_idx)
}
}
}
#[repr(C)]
#[derive(Debug, Copy, Clone, PartialEq)]
pub struct ByteString<'a> {
data: &'a [u8],
at: usize,
len: usize,
}
impl<'a> ByteString<'a> {
pub fn maybe_byte_string(data: &'a [u8]) -> bool {
Self::contain_header(data)
}
const fn header() -> &'static str {
"\x19Stacks Signed Message:\n"
}
// Checks if the input data contain the byte_string heades at the first bytes
fn contain_header(data: &[u8]) -> bool {
//let msg_bytes = Self::header().as_bytes();
let msg_bytes = "\x19Stacks Signed Message:\n".as_bytes();
data.len() > BYTE_STRING_HEADER_LEN && &data[..BYTE_STRING_HEADER_LEN] == msg_bytes
}
fn msg_len(data: &'a [u8]) -> Result<(usize, usize), ParserError> {
if data.is_empty() || !data.is_ascii() {
return Err(ParserError::parser_invalid_bytestr_message);
}
let mut digit_count = 0usize;
let mut len;
for (index, c) in data.iter().enumerate() {
if (*c as char).is_ascii_digit() {
digit_count += 1;
len = lexical_core::parse::<usize>(&data[..=index])
.map_err(|_| ParserError::parser_value_out_of_range)?;
let data_len = data.len() - digit_count;
// no trailing zeros
if len == 0 && data_len > 1 {
return Err(ParserError::parser_invalid_bytestr_message);
}
if len == data_len {
return Ok((digit_count, len));
}
} else {
break;
}
}
Err(ParserError::parser_invalid_bytestr_message)
}
pub fn from_bytes(data: &'a [u8]) -> Result<Self, ParserError> {
if !Self::contain_header(data) {
return Err(ParserError::parser_invalid_bytestr_message);
}
let (at, len) = Self::msg_len(&data[BYTE_STRING_HEADER_LEN..])?;
let at = BYTE_STRING_HEADER_LEN + at;
Ok(Self { data, at, len })
}
pub const fn num_items(&self) -> Result<u8, ParserError> {
//One ByteString message to show at least partially
Ok(1)
}
pub fn get_item(
&mut self,
display_idx: u8,
out_key: &mut [u8],
out_value: &mut [u8],
page_idx: u8,
) -> Result<u8, ParserError> {
let mut writer_key = Writer::new(out_key);
if display_idx == 0 {
writer_key
.write_str("Sign Message")
.map_err(|_| ParserError::parser_unexpected_buffer_end)?;
let len = if self.len > MAX_CHARS_TO_SHOW_FROM_MSG {
MAX_CHARS_TO_SHOW_FROM_MSG
} else {
self.len
} + self.at;
pageString(out_value, &self.data[self.at..len], page_idx)
} else {
Err(ParserError::parser_display_idx_out_of_range)
}
}
}
#[cfg(test)]
mod test {
extern crate std;
use std::string::String;
use super::*;
fn built_message(len: usize, data: &str) -> String {
format!("\x19Stacks Signed Message:\n{}{}", len, data)
}
#[test]
fn test_non_ascii_byte_string() {
let no_ascii = "Test-love: ❤️";
let no_ascii = built_message(no_ascii.len(), no_ascii);
let msg = ByteString::from_bytes(no_ascii.as_bytes());
assert!(msg.is_err());
}
#[test]
fn test_valid_byte_string() {
let data = "byte_string_valid";
let m = built_message(data.len(), data);
let msg = ByteString::from_bytes(m.as_bytes());
assert!(msg.is_ok());
let msg = msg.unwrap();
assert_eq!(&msg.data[msg.at..], data.as_bytes());
}
#[test]
fn test_valid_starts_with_number() {
let data = "1_byte_string_valid";
let m = built_message(data.len(), data);
let msg = ByteString::from_bytes(m.as_bytes());
assert!(msg.is_ok());
let msg = msg.unwrap();
assert_eq!(&msg.data[msg.at..], data.as_bytes());
}
#[test]
fn test_empty_byte_string() {
let data = "";
let m = built_message(data.len(), data);
let msg = ByteString::from_bytes(m.as_bytes());
assert!(msg.is_ok());
let msg = msg.unwrap();
assert_eq!(&msg.data[msg.at..], data.as_bytes());
}
#[test]
fn test_wrong_len_byte_string() {
let m = "byte_string_valid";
let m = built_message(34, m);
let msg = ByteString::from_bytes(m.as_bytes());
assert!(msg.is_err());
}
#[test]
fn test_only_text() {
let msg = ByteString::from_bytes("\x19Stacks Signed Message:\nHello_world".as_bytes());
assert!(msg.is_err());
}
#[test]
fn test_only_header() {
let msg = ByteString::from_bytes("\x19Stacks Signed Message:\n".as_bytes());
assert!(msg.is_err());
}
}