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use super::{CandidType, Serializer, Type, TypeId};
use crate::Error;
use crc8::Crc8;
use serde::de::{Deserialize, Visitor};
use std::fmt;
#[derive(PartialEq, Debug, Clone)]
pub struct Principal(pub Vec<u8>);
impl Principal {
pub fn from_text<S: AsRef<[u8]>>(text: S) -> crate::Result<Self> {
let (_text_prefix, text_rest) = text.as_ref().split_at(3);
match hex::decode(text_rest).unwrap().as_slice().split_last() {
None => Err(Error::msg("Cannot parse principal")),
Some((last, buf)) => {
let mut crc8 = Crc8::create_msb(0x07);
let checksum: u8 = crc8.calc(buf, buf.len() as i32, 0);
if *last == checksum {
Ok(Principal(buf.to_vec()))
} else {
Err(Error::msg("Bad checksum"))
}
}
}
}
pub fn from_bytes<S: AsRef<[u8]>>(bytes: S) -> Principal {
Principal(bytes.as_ref().to_vec())
}
pub fn to_text(&self) -> String {
let mut crc8 = Crc8::create_msb(0x07);
let checksum: u8 = crc8.calc(&self.0, self.0.len() as i32, 0);
let mut buf = self.0.clone();
buf.push(checksum);
format!("ic:{}", hex::encode_upper(buf))
}
}
impl fmt::Display for Principal {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
write!(f, "{}", self.to_text())
}
}
impl CandidType for Principal {
fn id() -> TypeId {
TypeId::of::<Principal>()
}
fn _ty() -> Type {
Type::Principal
}
fn idl_serialize<S>(&self, serializer: S) -> Result<(), S::Error>
where
S: Serializer,
{
serializer.serialize_principal(&self.0)
}
}
impl<'de> Deserialize<'de> for Principal {
fn deserialize<D>(deserializer: D) -> Result<Self, D::Error>
where
D: serde::Deserializer<'de>,
{
struct PrincipalVisitor;
impl<'de> Visitor<'de> for PrincipalVisitor {
type Value = Principal;
fn expecting(&self, formatter: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
formatter.write_str("Principal value")
}
fn visit_bytes<E>(self, v: &[u8]) -> Result<Self::Value, E> {
Ok(Principal(v[1..].to_vec()))
}
}
deserializer.deserialize_any(PrincipalVisitor)
}
}