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use alloc::{format, string::String, vec::Vec};
use core::{
convert::TryFrom,
fmt::{self, Debug, Display, Formatter},
};
use base16;
use hex_fmt::HexFmt;
use crate::{
bytesrepr::{self, OPTION_TAG_SERIALIZED_LENGTH, U32_SERIALIZED_LENGTH},
AccessRights, ApiError, Key, ACCESS_RIGHTS_SERIALIZED_LENGTH,
};
pub const UREF_ADDR_LENGTH: usize = 32;
pub const UREF_SERIALIZED_LENGTH: usize =
UREF_ADDR_LENGTH + OPTION_TAG_SERIALIZED_LENGTH + ACCESS_RIGHTS_SERIALIZED_LENGTH;
#[derive(Copy, Clone, Hash, PartialEq, Eq, PartialOrd, Ord)]
pub struct URef([u8; UREF_ADDR_LENGTH], Option<AccessRights>);
impl URef {
pub fn new(address: [u8; UREF_ADDR_LENGTH], access_rights: AccessRights) -> Self {
URef(address, Some(access_rights))
}
#[cfg(any(test, feature = "gens"))]
pub(crate) fn unsafe_new(
id: [u8; UREF_ADDR_LENGTH],
maybe_access_rights: Option<AccessRights>,
) -> Self {
URef(id, maybe_access_rights)
}
pub fn addr(&self) -> [u8; UREF_ADDR_LENGTH] {
self.0
}
pub fn access_rights(&self) -> Option<AccessRights> {
self.1
}
pub fn with_access_rights(self, access_rights: AccessRights) -> Self {
URef(self.0, Some(access_rights))
}
pub fn remove_access_rights(self) -> Self {
URef(self.0, None)
}
pub fn is_readable(self) -> bool {
if let Some(access_rights) = self.1 {
access_rights.is_readable()
} else {
false
}
}
pub fn into_read(self) -> URef {
URef(self.0, Some(AccessRights::READ))
}
pub fn into_read_add_write(self) -> URef {
URef(self.0, Some(AccessRights::READ_ADD_WRITE))
}
pub fn is_writeable(self) -> bool {
if let Some(access_rights) = self.1 {
access_rights.is_writeable()
} else {
false
}
}
pub fn is_addable(self) -> bool {
if let Some(access_rights) = self.1 {
access_rights.is_addable()
} else {
false
}
}
pub fn as_string(&self) -> String {
let access_rights_bits = self
.access_rights()
.map(|value| value.bits())
.unwrap_or_default();
format!(
"uref-{}-{:03o}",
base16::encode_lower(&self.addr()),
access_rights_bits
)
}
}
impl Display for URef {
fn fmt(&self, f: &mut Formatter) -> fmt::Result {
let addr = self.addr();
let access_rights_o = self.access_rights();
if let Some(access_rights) = access_rights_o {
write!(f, "URef({}, {})", HexFmt(&addr), access_rights)
} else {
write!(f, "URef({}, None)", HexFmt(&addr))
}
}
}
impl Debug for URef {
fn fmt(&self, f: &mut Formatter) -> fmt::Result {
write!(f, "{}", self)
}
}
impl bytesrepr::ToBytes for URef {
fn to_bytes(&self) -> Result<Vec<u8>, bytesrepr::Error> {
let mut result = Vec::with_capacity(UREF_SERIALIZED_LENGTH);
result.append(&mut self.0.to_bytes()?);
result.append(&mut self.1.to_bytes()?);
Ok(result)
}
}
impl bytesrepr::FromBytes for URef {
fn from_bytes(bytes: &[u8]) -> Result<(Self, &[u8]), bytesrepr::Error> {
let (id, rem): ([u8; 32], &[u8]) = bytesrepr::FromBytes::from_bytes(bytes)?;
let (maybe_access_rights, rem): (Option<AccessRights>, &[u8]) =
bytesrepr::FromBytes::from_bytes(rem)?;
Ok((URef(id, maybe_access_rights), rem))
}
}
impl bytesrepr::FromBytes for Vec<URef> {
fn from_bytes(bytes: &[u8]) -> Result<(Self, &[u8]), bytesrepr::Error> {
let (size, mut stream): (u32, &[u8]) = bytesrepr::FromBytes::from_bytes(bytes)?;
let mut result = Vec::new();
result.try_reserve_exact(size as usize)?;
for _ in 0..size {
let (uref, rem): (URef, &[u8]) = bytesrepr::FromBytes::from_bytes(stream)?;
result.push(uref);
stream = rem;
}
Ok((result, stream))
}
}
impl bytesrepr::ToBytes for Vec<URef> {
fn to_bytes(&self) -> Result<Vec<u8>, bytesrepr::Error> {
let size = self.len() as u32;
let mut result: Vec<u8> = Vec::with_capacity(U32_SERIALIZED_LENGTH);
result.extend(size.to_bytes()?);
result.extend(
self.iter()
.map(bytesrepr::ToBytes::to_bytes)
.collect::<Result<Vec<_>, _>>()?
.into_iter()
.flatten(),
);
Ok(result)
}
}
impl TryFrom<Key> for URef {
type Error = ApiError;
fn try_from(key: Key) -> Result<Self, Self::Error> {
if let Key::URef(uref) = key {
Ok(uref)
} else {
Err(ApiError::UnexpectedKeyVariant)
}
}
}
#[cfg(test)]
mod tests {
use super::*;
#[test]
fn uref_as_string() {
let addr_array = [0u8; 32];
let uref_a = URef::new(addr_array, AccessRights::READ);
assert_eq!(
uref_a.as_string(),
"uref-0000000000000000000000000000000000000000000000000000000000000000-001"
);
let uref_b = URef::new(addr_array, AccessRights::WRITE);
assert_eq!(
uref_b.as_string(),
"uref-0000000000000000000000000000000000000000000000000000000000000000-002"
);
let uref_c = uref_b.remove_access_rights();
assert_eq!(
uref_c.as_string(),
"uref-0000000000000000000000000000000000000000000000000000000000000000-000"
);
}
}