use std::fs::File;
use std::io::Read;
use crate::sig::SigningKeyPair;
use rust_util::XResult;

lazy_static::lazy_static! {
    static ref SIGNING_KEY_PAIR: Option<SigningKeyPair> = load_signing_key_pair();
}

pub fn get_signing_public_key() -> Option<String> {
    SIGNING_KEY_PAIR.as_ref().map(|key_pair| hex::encode(&key_pair.public_key()))
}

pub fn load_signing_key_pair() -> Option<SigningKeyPair> {
    SigningKeyPair::read_from_file("platform_signing_key.json").ok()
}

pub fn read_file(f: &str) -> XResult<String> {
    let mut file = File::open(&f).map_err(|e| rust_util::new_box_error(&format!("Open file: {}, failed: {}", f , e)))?;
    let mut buf = String::new();
    file.read_to_string(&mut buf).map_err(|e| rust_util::new_box_error(&format!("Read file: {}, failed: {}", f , e)))?;
    Ok(buf)
}