Add docs for CA renewal

backend/src/services/certificate-authority/certificate-authority-fns.ts

@@ -24,6 +24,40 @@ export const createDistinguishedName = (parts: TDNParts) => {
   return dnParts.join(", ");
 };
 
+export const parseDistinguishedName = (dn: string): TDNParts => {
+  const parts: TDNParts = {};
+  const dnParts = dn.split(/,\s*/);
+
+  for (const part of dnParts) {
+    const [key, value] = part.split("=");
+    switch (key.toUpperCase()) {
+      case "C":
+        parts.country = value;
+        break;
+      case "O":
+        parts.organization = value;
+        break;
+      case "OU":
+        parts.ou = value;
+        break;
+      case "ST":
+        parts.province = value;
+        break;
+      case "CN":
+        parts.commonName = value;
+        break;
+      case "L":
+        parts.locality = value;
+        break;
+      default:
+        // Ignore unrecognized keys
+        break;
+    }
+  }
+
+  return parts;
+};
+
 export const keyAlgorithmToAlgCfg = (keyAlgorithm: CertKeyAlgorithm) => {
   switch (keyAlgorithm) {
     case CertKeyAlgorithm.RSA_4096: