From be9f0fd29a1e47fdaec01caf344e897ac42e048a Mon Sep 17 00:00:00 2001
From: nworbnhoj <john@nhoj.info>
Date: Mon, 26 Jun 2023 12:35:20 +1000
Subject: [PATCH] implement tls RustlsOwnedTrustAnchor::subject()

---
 libs/tls/src/lib.rs | 14 +++++++++++++-
 1 file changed, 13 insertions(+), 1 deletion(-)

diff --git a/libs/tls/src/lib.rs b/libs/tls/src/lib.rs
index fdbc45197..6e567b3dc 100644
--- a/libs/tls/src/lib.rs
+++ b/libs/tls/src/lib.rs
@@ -6,13 +6,14 @@ use rkyv::{
     ser::{serializers::WriteSerializer, Serializer},
     AlignedVec, Archive, Deserialize, Serialize,
 };
-use rustls::{Certificate, DistinguishedName, RootCertStore};
+use rustls::{Certificate, RootCertStore};
 use std::cmp::min;
 use std::convert::{Into, TryFrom};
 use std::fs::File;
 use std::io::{Error, ErrorKind, Read, Write};
 use std::path::PathBuf;
 use x509_parser::prelude::{FromDer, X509Certificate};
+use x509_parser::der_parser::der::Tag;
 use xous_names::XousNames;
 
 /// PDDB Dict for tls trusted certificates keys
@@ -41,6 +42,17 @@ pub fn from_subject_spki_name_constraints(
 }
 
 
+    pub fn subject(&self) -> String {
+        let der = self.subject.clone();
+        let len = min(der.len(), 127);
+        let mut der = der[..len].to_owned();
+        der.insert(0, len as u8);
+        der.insert(0, Tag::Sequence.0 as u8);
+        match x509_parser::x509::X509Name::from_der(&der) {
+            Ok((_, decoded)) => decoded.to_string(),
+            Err(e) => format!("der parse failed: {e}").to_string(),
+        }
+    }