alipay-rs 0.3.2

Simple encapsulation of Alipay interface
Documentation 
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use crate::error::AlipayResult;
use openssl::{
    hash::{hash, MessageDigest},
    nid::Nid,
    x509::{X509NameEntries, X509},
};
use std::fs;

pub(crate) fn get_file_content(key_path: &str) -> AlipayResult<String> {
    let private_key = fs::read_to_string(key_path)?;
    Ok(private_key)
}

// 从证书中获取序列号
pub(crate) fn get_cert_sn(cert_path: &str) -> AlipayResult<String> {
    let cert = fs::read_to_string(cert_path)?;
    // let ssl = X509::from_pem(cert.as_slice())?;
    get_cert_sn_from_content(cert.as_ref())
}

pub(crate) fn get_cert_sn_from_content(content: &[u8]) -> AlipayResult<String> {
    let ssl = X509::from_pem(content)?;
    let issuer = iter2string(ssl.issuer_name().entries())?;
    let serial_number = ssl.serial_number().to_bn()?.to_dec_str()?;
    let data = issuer + &serial_number;
    Ok(hex::encode(hash(MessageDigest::md5(), data.as_ref())?))
}
// 提取根证书序列号
pub(crate) fn get_root_cert_sn_from_content(cert_content: &str) -> AlipayResult<String> {
    let alipay_root_cert_sn: String = cert_content
        .split_inclusive("-----END CERTIFICATE-----")
        .filter(|cert| {
            let ssl = X509::from_pem(cert.as_ref()).unwrap();
            let algorithm = ssl.signature_algorithm().object().nid();
            algorithm == Nid::SHA256WITHRSAENCRYPTION || algorithm == Nid::SHA1WITHRSAENCRYPTION
        })
        .filter_map(|cert| get_cert_sn_from_content(cert.as_ref()).ok())
        .collect::<Vec<String>>()
        .join("_");

    Ok(alipay_root_cert_sn)
}
pub(crate) fn get_root_cert_sn(cert_path: &str) -> AlipayResult<String> {
    let cert_content = fs::read_to_string(cert_path)?;
    get_root_cert_sn_from_content(&cert_content)
}

fn iter2string(iter: X509NameEntries) -> AlipayResult<String> {
    let mut string: String = String::from("");
    for value in iter {
        let data = value.data().as_utf8()?.to_string();
        let key = value.object().nid().short_name()?.to_owned();
        string.insert_str(0, &(key + "=" + &data + ","));
    }
    string.pop();
    Ok(string)
}