Copilot commented on code in PR #12683:
URL: https://github.com/apache/trafficserver/pull/12683#discussion_r2548864848


##########
plugins/lua/ts_lua_client_cert_helpers.h:
##########
@@ -0,0 +1,247 @@
+/*
+  Licensed to the Apache Software Foundation (ASF) under one
+  or more contributor license agreements.  See the NOTICE file
+  distributed with this work for additional information
+  regarding copyright ownership.  The ASF licenses this file
+  to you under the Apache License, Version 2.0 (the
+  "License"); you may not use this file except in compliance
+  with the License.  You may obtain a copy of the License at
+
+  http://www.apache.org/licenses/LICENSE-2.0
+
+  Unless required by applicable law or agreed to in writing, software
+  distributed under the License is distributed on an "AS IS" BASIS,
+  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+  See the License for the specific language governing permissions and
+  limitations under the License.
+*/
+
+// Helper functions for certificate data extraction
+static std::string
+get_x509_name_string(X509_NAME *name)
+{
+  if (!name) {
+    return "";
+  }
+
+  BIO *bio = BIO_new(BIO_s_mem());
+  if (!bio) {
+    return "";
+  }
+
+  if (X509_NAME_print_ex(bio, name, 0, XN_FLAG_RFC2253) <= 0) {
+    BIO_free(bio);
+    return "";
+  }
+
+  char       *data   = nullptr;
+  long        length = BIO_get_mem_data(bio, &data);
+  std::string result;
+
+  if (data && length > 0) {
+    result.assign(data, length);
+  }
+
+  BIO_free(bio);
+  return result;
+}
+
+static std::string
+get_x509_serial_string(X509 *cert)
+{
+  if (!cert) {
+    return "";
+  }
+
+  ASN1_INTEGER *serial = X509_get_serialNumber(cert);
+  if (!serial) {
+    return "";
+  }
+
+  BIO *bio = BIO_new(BIO_s_mem());
+  if (!bio) {
+    return "";
+  }
+
+  if (i2a_ASN1_INTEGER(bio, serial) <= 0) {
+    BIO_free(bio);
+    return "";
+  }
+
+  char       *data   = nullptr;
+  long        length = BIO_get_mem_data(bio, &data);
+  std::string result;
+
+  if (data && length > 0) {
+    result.assign(data, length);
+  }
+
+  BIO_free(bio);
+  return result;
+}
+
+static std::string
+get_x509_time_string(ASN1_TIME *time)
+{
+  if (!time) {
+    return "";
+  }
+
+  BIO *bio = BIO_new(BIO_s_mem());
+  if (!bio) {
+    return "";
+  }
+
+  if (ASN1_TIME_print(bio, time) <= 0) {
+    BIO_free(bio);
+    return "";
+  }
+
+  char       *data   = nullptr;
+  long        length = BIO_get_mem_data(bio, &data);
+  std::string result;
+
+  if (data && length > 0) {
+    result.assign(data, length);
+  }
+
+  BIO_free(bio);
+  return result;
+}
+
+static std::string
+get_x509_pem_string(X509 *cert)
+{
+  if (!cert) {
+    return "";
+  }
+
+  BIO *bio = BIO_new(BIO_s_mem());
+  if (!bio) {
+    return "";
+  }
+
+  if (PEM_write_bio_X509(bio, cert) <= 0) {
+    BIO_free(bio);
+    return "";
+  }
+
+  char       *data   = nullptr;
+  long        length = BIO_get_mem_data(bio, &data);
+  std::string result;
+
+  if (data && length > 0) {
+    result.assign(data, length);
+  }
+
+  BIO_free(bio);
+  return result;
+}
+
+static std::string
+get_x509_signature_string(X509 *cert)
+{
+  if (!cert) {
+    return "";
+  }
+
+  const ASN1_BIT_STRING *sig = nullptr;
+#if OPENSSL_VERSION_NUMBER >= 0x10100000L

Review Comment:
   Inconsistent OpenSSL version check. The helper file uses 
`OPENSSL_VERSION_NUMBER >= 0x10100000L` (OpenSSL 1.1.0+) while the main file 
`ts_lua_client_request.cc` uses `OPENSSL_IS_OPENSSL3` for similar OpenSSL API 
compatibility checks. This inconsistency could lead to build issues or runtime 
incompatibilities. Consider using `OPENSSL_IS_OPENSSL3` consistently across 
both files, or document why different version checks are needed for different 
APIs.
   ```suggestion
   #if defined(OPENSSL_IS_OPENSSL3)
   ```



##########
plugins/lua/ts_lua_client_request.cc:
##########
@@ -1169,6 +1203,927 @@ ts_lua_client_request_get_ssl_curve(lua_State *L)
   return 1;
 }
 
+// Certificate API Functions
+static void
+ts_lua_inject_client_request_cert_api(lua_State *L)
+{
+  // Client certificate functions
+  lua_pushcfunction(L, ts_lua_client_request_client_cert_get_pem);
+  lua_setfield(L, -2, "client_cert_get_pem");
+
+  lua_pushcfunction(L, ts_lua_client_request_client_cert_get_subject);
+  lua_setfield(L, -2, "client_cert_get_subject");
+
+  lua_pushcfunction(L, ts_lua_client_request_client_cert_get_issuer);
+  lua_setfield(L, -2, "client_cert_get_issuer");
+
+  lua_pushcfunction(L, ts_lua_client_request_client_cert_get_serial);
+  lua_setfield(L, -2, "client_cert_get_serial");
+
+  lua_pushcfunction(L, ts_lua_client_request_client_cert_get_signature);
+  lua_setfield(L, -2, "client_cert_get_signature");
+
+  lua_pushcfunction(L, ts_lua_client_request_client_cert_get_not_before);
+  lua_setfield(L, -2, "client_cert_get_not_before");
+
+  lua_pushcfunction(L, ts_lua_client_request_client_cert_get_not_after);
+  lua_setfield(L, -2, "client_cert_get_not_after");
+
+  lua_pushcfunction(L, ts_lua_client_request_client_cert_get_version);
+  lua_setfield(L, -2, "client_cert_get_version");
+
+  lua_pushcfunction(L, ts_lua_client_request_client_cert_get_san_dns);
+  lua_setfield(L, -2, "client_cert_get_san_dns");
+
+  lua_pushcfunction(L, ts_lua_client_request_client_cert_get_san_ip);
+  lua_setfield(L, -2, "client_cert_get_san_ip");
+
+  lua_pushcfunction(L, ts_lua_client_request_client_cert_get_san_email);
+  lua_setfield(L, -2, "client_cert_get_san_email");
+
+  lua_pushcfunction(L, ts_lua_client_request_client_cert_get_san_uri);
+  lua_setfield(L, -2, "client_cert_get_san_uri");
+
+  // Server certificate functions
+  lua_pushcfunction(L, ts_lua_client_request_server_cert_get_pem);
+  lua_setfield(L, -2, "server_cert_get_pem");
+
+  lua_pushcfunction(L, ts_lua_client_request_server_cert_get_subject);
+  lua_setfield(L, -2, "server_cert_get_subject");
+
+  lua_pushcfunction(L, ts_lua_client_request_server_cert_get_issuer);
+  lua_setfield(L, -2, "server_cert_get_issuer");
+
+  lua_pushcfunction(L, ts_lua_client_request_server_cert_get_serial);
+  lua_setfield(L, -2, "server_cert_get_serial");
+
+  lua_pushcfunction(L, ts_lua_client_request_server_cert_get_signature);
+  lua_setfield(L, -2, "server_cert_get_signature");
+
+  lua_pushcfunction(L, ts_lua_client_request_server_cert_get_not_before);
+  lua_setfield(L, -2, "server_cert_get_not_before");
+
+  lua_pushcfunction(L, ts_lua_client_request_server_cert_get_not_after);
+  lua_setfield(L, -2, "server_cert_get_not_after");
+
+  lua_pushcfunction(L, ts_lua_client_request_server_cert_get_version);
+  lua_setfield(L, -2, "server_cert_get_version");
+
+  lua_pushcfunction(L, ts_lua_client_request_server_cert_get_san_dns);
+  lua_setfield(L, -2, "server_cert_get_san_dns");
+
+  lua_pushcfunction(L, ts_lua_client_request_server_cert_get_san_ip);
+  lua_setfield(L, -2, "server_cert_get_san_ip");
+
+  lua_pushcfunction(L, ts_lua_client_request_server_cert_get_san_email);
+  lua_setfield(L, -2, "server_cert_get_san_email");
+
+  lua_pushcfunction(L, ts_lua_client_request_server_cert_get_san_uri);
+  lua_setfield(L, -2, "server_cert_get_san_uri");
+}
+
+// Client Certificate Functions
+static int
+ts_lua_client_request_client_cert_get_pem(lua_State *L)
+{
+  ts_lua_http_ctx *http_ctx;
+  TSHttpSsn        ssnp;
+  TSVConn          client_conn;
+
+  GET_HTTP_CONTEXT(http_ctx, L);
+
+  ssnp        = TSHttpTxnSsnGet(http_ctx->txnp);
+  client_conn = TSHttpSsnClientVConnGet(ssnp);
+
+  if (TSVConnIsSsl(client_conn)) {
+    TSSslConnection ssl_conn = TSVConnSslConnectionGet(client_conn);
+    if (ssl_conn) {
+      SSL *ssl = reinterpret_cast<SSL *>(ssl_conn);
+#ifdef OPENSSL_IS_OPENSSL3
+      X509 *cert = SSL_get1_peer_certificate(ssl);
+#else
+      X509 *cert = SSL_get_peer_certificate(ssl);
+#endif
+      if (cert) {
+        std::string pem = get_x509_pem_string(cert);
+        X509_free(cert);
+        if (!pem.empty()) {
+          lua_pushlstring(L, pem.c_str(), pem.length());
+          return 1;
+        }
+      }
+    }
+  }
+
+  lua_pushnil(L);
+  return 1;
+}
+
+static int
+ts_lua_client_request_client_cert_get_subject(lua_State *L)
+{
+  ts_lua_http_ctx *http_ctx;
+  TSHttpSsn        ssnp;
+  TSVConn          client_conn;
+
+  GET_HTTP_CONTEXT(http_ctx, L);
+
+  ssnp        = TSHttpTxnSsnGet(http_ctx->txnp);
+  client_conn = TSHttpSsnClientVConnGet(ssnp);
+
+  if (TSVConnIsSsl(client_conn)) {
+    TSSslConnection ssl_conn = TSVConnSslConnectionGet(client_conn);
+    if (ssl_conn) {
+      SSL *ssl = reinterpret_cast<SSL *>(ssl_conn);
+#ifdef OPENSSL_IS_OPENSSL3
+      X509 *cert = SSL_get1_peer_certificate(ssl);
+#else
+      X509 *cert = SSL_get_peer_certificate(ssl);
+#endif
+      if (cert) {
+        std::string subject = 
get_x509_name_string(X509_get_subject_name(cert));
+        X509_free(cert);
+        if (!subject.empty()) {
+          lua_pushlstring(L, subject.c_str(), subject.length());
+          return 1;
+        }
+      }
+    }
+  }
+
+  lua_pushnil(L);
+  return 1;
+}
+
+static int
+ts_lua_client_request_client_cert_get_issuer(lua_State *L)
+{
+  ts_lua_http_ctx *http_ctx;
+  TSHttpSsn        ssnp;
+  TSVConn          client_conn;
+
+  GET_HTTP_CONTEXT(http_ctx, L);
+
+  ssnp        = TSHttpTxnSsnGet(http_ctx->txnp);
+  client_conn = TSHttpSsnClientVConnGet(ssnp);
+
+  if (TSVConnIsSsl(client_conn)) {
+    TSSslConnection ssl_conn = TSVConnSslConnectionGet(client_conn);
+    if (ssl_conn) {
+      SSL *ssl = reinterpret_cast<SSL *>(ssl_conn);
+#ifdef OPENSSL_IS_OPENSSL3
+      X509 *cert = SSL_get1_peer_certificate(ssl);
+#else
+      X509 *cert = SSL_get_peer_certificate(ssl);
+#endif
+      if (cert) {
+        std::string issuer = get_x509_name_string(X509_get_issuer_name(cert));
+        X509_free(cert);
+        if (!issuer.empty()) {
+          lua_pushlstring(L, issuer.c_str(), issuer.length());
+          return 1;
+        }
+      }
+    }
+  }
+
+  lua_pushnil(L);
+  return 1;
+}
+
+static int
+ts_lua_client_request_client_cert_get_serial(lua_State *L)
+{
+  ts_lua_http_ctx *http_ctx;
+  TSHttpSsn        ssnp;
+  TSVConn          client_conn;
+
+  GET_HTTP_CONTEXT(http_ctx, L);
+
+  ssnp        = TSHttpTxnSsnGet(http_ctx->txnp);
+  client_conn = TSHttpSsnClientVConnGet(ssnp);
+
+  if (TSVConnIsSsl(client_conn)) {
+    TSSslConnection ssl_conn = TSVConnSslConnectionGet(client_conn);
+    if (ssl_conn) {
+      SSL *ssl = reinterpret_cast<SSL *>(ssl_conn);
+#ifdef OPENSSL_IS_OPENSSL3
+      X509 *cert = SSL_get1_peer_certificate(ssl);
+#else
+      X509 *cert = SSL_get_peer_certificate(ssl);
+#endif
+      if (cert) {
+        std::string serial = get_x509_serial_string(cert);
+        X509_free(cert);
+        if (!serial.empty()) {
+          lua_pushlstring(L, serial.c_str(), serial.length());
+          return 1;
+        }
+      }
+    }
+  }
+
+  lua_pushnil(L);
+  return 1;
+}
+
+static int
+ts_lua_client_request_client_cert_get_signature(lua_State *L)
+{
+  ts_lua_http_ctx *http_ctx;
+  TSHttpSsn        ssnp;
+  TSVConn          client_conn;
+
+  GET_HTTP_CONTEXT(http_ctx, L);
+
+  ssnp        = TSHttpTxnSsnGet(http_ctx->txnp);
+  client_conn = TSHttpSsnClientVConnGet(ssnp);
+
+  if (TSVConnIsSsl(client_conn)) {
+    TSSslConnection ssl_conn = TSVConnSslConnectionGet(client_conn);
+    if (ssl_conn) {
+      SSL *ssl = reinterpret_cast<SSL *>(ssl_conn);
+#ifdef OPENSSL_IS_OPENSSL3
+      X509 *cert = SSL_get1_peer_certificate(ssl);
+#else
+      X509 *cert = SSL_get_peer_certificate(ssl);
+#endif
+      if (cert) {
+        std::string sig = get_x509_signature_string(cert);
+        X509_free(cert);
+        if (!sig.empty()) {
+          lua_pushlstring(L, sig.c_str(), sig.length());
+          return 1;
+        }
+      }
+    }
+  }
+
+  lua_pushnil(L);
+  return 1;
+}
+
+static int
+ts_lua_client_request_client_cert_get_not_before(lua_State *L)
+{
+  ts_lua_http_ctx *http_ctx;
+  TSHttpSsn        ssnp;
+  TSVConn          client_conn;
+
+  GET_HTTP_CONTEXT(http_ctx, L);
+
+  ssnp        = TSHttpTxnSsnGet(http_ctx->txnp);
+  client_conn = TSHttpSsnClientVConnGet(ssnp);
+
+  if (TSVConnIsSsl(client_conn)) {
+    TSSslConnection ssl_conn = TSVConnSslConnectionGet(client_conn);
+    if (ssl_conn) {
+      SSL *ssl = reinterpret_cast<SSL *>(ssl_conn);
+#ifdef OPENSSL_IS_OPENSSL3
+      X509 *cert = SSL_get1_peer_certificate(ssl);
+#else
+      X509 *cert = SSL_get_peer_certificate(ssl);
+#endif
+      if (cert) {
+        std::string not_before = 
get_x509_time_string(X509_get_notBefore(cert));
+        X509_free(cert);
+        if (!not_before.empty()) {
+          lua_pushlstring(L, not_before.c_str(), not_before.length());
+          return 1;
+        }
+      }
+    }
+  }
+
+  lua_pushnil(L);
+  return 1;
+}
+
+static int
+ts_lua_client_request_client_cert_get_not_after(lua_State *L)
+{
+  ts_lua_http_ctx *http_ctx;
+  TSHttpSsn        ssnp;
+  TSVConn          client_conn;
+
+  GET_HTTP_CONTEXT(http_ctx, L);
+
+  ssnp        = TSHttpTxnSsnGet(http_ctx->txnp);
+  client_conn = TSHttpSsnClientVConnGet(ssnp);
+
+  if (TSVConnIsSsl(client_conn)) {
+    TSSslConnection ssl_conn = TSVConnSslConnectionGet(client_conn);
+    if (ssl_conn) {
+      SSL *ssl = reinterpret_cast<SSL *>(ssl_conn);
+#ifdef OPENSSL_IS_OPENSSL3
+      X509 *cert = SSL_get1_peer_certificate(ssl);
+#else
+      X509 *cert = SSL_get_peer_certificate(ssl);
+#endif
+      if (cert) {
+        std::string not_after = get_x509_time_string(X509_get_notAfter(cert));
+        X509_free(cert);
+        if (!not_after.empty()) {
+          lua_pushlstring(L, not_after.c_str(), not_after.length());
+          return 1;
+        }
+      }
+    }
+  }
+
+  lua_pushnil(L);
+  return 1;
+}
+
+static int
+ts_lua_client_request_client_cert_get_version(lua_State *L)
+{
+  ts_lua_http_ctx *http_ctx;
+  TSHttpSsn        ssnp;
+  TSVConn          client_conn;
+
+  GET_HTTP_CONTEXT(http_ctx, L);
+
+  ssnp        = TSHttpTxnSsnGet(http_ctx->txnp);
+  client_conn = TSHttpSsnClientVConnGet(ssnp);
+
+  if (TSVConnIsSsl(client_conn)) {
+    TSSslConnection ssl_conn = TSVConnSslConnectionGet(client_conn);
+    if (ssl_conn) {
+      SSL *ssl = reinterpret_cast<SSL *>(ssl_conn);
+#ifdef OPENSSL_IS_OPENSSL3
+      X509 *cert = SSL_get1_peer_certificate(ssl);
+#else
+      X509 *cert = SSL_get_peer_certificate(ssl);
+#endif
+      if (cert) {
+        long version = X509_get_version(cert);
+        X509_free(cert);
+        lua_pushinteger(L, version);
+        return 1;
+      }
+    }
+  }
+
+  lua_pushnil(L);
+  return 1;
+}
+
+static int
+ts_lua_client_request_client_cert_get_san_dns(lua_State *L)
+{
+  ts_lua_http_ctx *http_ctx;
+  TSHttpSsn        ssnp;
+  TSVConn          client_conn;
+
+  GET_HTTP_CONTEXT(http_ctx, L);
+
+  ssnp        = TSHttpTxnSsnGet(http_ctx->txnp);
+  client_conn = TSHttpSsnClientVConnGet(ssnp);
+
+  if (TSVConnIsSsl(client_conn)) {
+    TSSslConnection ssl_conn = TSVConnSslConnectionGet(client_conn);
+    if (ssl_conn) {
+      SSL *ssl = reinterpret_cast<SSL *>(ssl_conn);
+#ifdef OPENSSL_IS_OPENSSL3
+      X509 *cert = SSL_get1_peer_certificate(ssl);
+#else
+      X509 *cert = SSL_get_peer_certificate(ssl);
+#endif
+      if (cert) {
+        std::vector<std::string> dns_names = get_x509_san_strings(cert, 
GEN_DNS);
+        X509_free(cert);
+
+        if (!dns_names.empty()) {
+          lua_newtable(L);
+          for (size_t i = 0; i < dns_names.size(); i++) {
+            lua_pushlstring(L, dns_names[i].c_str(), dns_names[i].length());
+            lua_rawseti(L, -2, i + 1);
+          }
+          return 1;
+        }
+      }
+    }
+  }
+
+  lua_pushnil(L);
+  return 1;
+}
+
+static int
+ts_lua_client_request_client_cert_get_san_ip(lua_State *L)
+{
+  ts_lua_http_ctx *http_ctx;
+  TSHttpSsn        ssnp;
+  TSVConn          client_conn;
+
+  GET_HTTP_CONTEXT(http_ctx, L);
+
+  ssnp        = TSHttpTxnSsnGet(http_ctx->txnp);
+  client_conn = TSHttpSsnClientVConnGet(ssnp);
+
+  if (TSVConnIsSsl(client_conn)) {
+    TSSslConnection ssl_conn = TSVConnSslConnectionGet(client_conn);
+    if (ssl_conn) {
+      SSL *ssl = reinterpret_cast<SSL *>(ssl_conn);
+#ifdef OPENSSL_IS_OPENSSL3
+      X509 *cert = SSL_get1_peer_certificate(ssl);
+#else
+      X509 *cert = SSL_get_peer_certificate(ssl);
+#endif
+      if (cert) {
+        std::vector<std::string> ip_addrs = get_x509_san_strings(cert, 
GEN_IPADD);
+        X509_free(cert);
+
+        if (!ip_addrs.empty()) {
+          lua_newtable(L);
+          for (size_t i = 0; i < ip_addrs.size(); i++) {
+            lua_pushlstring(L, ip_addrs[i].c_str(), ip_addrs[i].length());
+            lua_rawseti(L, -2, i + 1);
+          }
+          return 1;
+        }
+      }
+    }
+  }
+
+  lua_pushnil(L);
+  return 1;
+}
+
+static int
+ts_lua_client_request_client_cert_get_san_email(lua_State *L)
+{
+  ts_lua_http_ctx *http_ctx;
+  TSHttpSsn        ssnp;
+  TSVConn          client_conn;
+
+  GET_HTTP_CONTEXT(http_ctx, L);
+
+  ssnp        = TSHttpTxnSsnGet(http_ctx->txnp);
+  client_conn = TSHttpSsnClientVConnGet(ssnp);
+
+  if (TSVConnIsSsl(client_conn)) {
+    TSSslConnection ssl_conn = TSVConnSslConnectionGet(client_conn);
+    if (ssl_conn) {
+      SSL *ssl = reinterpret_cast<SSL *>(ssl_conn);
+#ifdef OPENSSL_IS_OPENSSL3
+      X509 *cert = SSL_get1_peer_certificate(ssl);
+#else
+      X509 *cert = SSL_get_peer_certificate(ssl);
+#endif
+      if (cert) {
+        std::vector<std::string> emails = get_x509_san_strings(cert, 
GEN_EMAIL);
+        X509_free(cert);
+
+        if (!emails.empty()) {
+          lua_newtable(L);
+          for (size_t i = 0; i < emails.size(); i++) {
+            lua_pushlstring(L, emails[i].c_str(), emails[i].length());
+            lua_rawseti(L, -2, i + 1);
+          }
+          return 1;
+        }
+      }
+    }
+  }
+
+  lua_pushnil(L);
+  return 1;
+}
+
+static int
+ts_lua_client_request_client_cert_get_san_uri(lua_State *L)
+{
+  ts_lua_http_ctx *http_ctx;
+  TSHttpSsn        ssnp;
+  TSVConn          client_conn;
+
+  GET_HTTP_CONTEXT(http_ctx, L);
+
+  ssnp        = TSHttpTxnSsnGet(http_ctx->txnp);
+  client_conn = TSHttpSsnClientVConnGet(ssnp);
+
+  if (TSVConnIsSsl(client_conn)) {
+    TSSslConnection ssl_conn = TSVConnSslConnectionGet(client_conn);
+    if (ssl_conn) {
+      SSL *ssl = reinterpret_cast<SSL *>(ssl_conn);
+#ifdef OPENSSL_IS_OPENSSL3
+      X509 *cert = SSL_get1_peer_certificate(ssl);
+#else
+      X509 *cert = SSL_get_peer_certificate(ssl);
+#endif
+      if (cert) {
+        std::vector<std::string> uris = get_x509_san_strings(cert, GEN_URI);
+        X509_free(cert);
+
+        if (!uris.empty()) {
+          lua_newtable(L);
+          for (size_t i = 0; i < uris.size(); i++) {
+            lua_pushlstring(L, uris[i].c_str(), uris[i].length());
+            lua_rawseti(L, -2, i + 1);
+          }
+          return 1;
+        }
+      }
+    }
+  }
+
+  lua_pushnil(L);
+  return 1;
+}

Review Comment:
   [nitpick] Repeated certificate retrieval causes unnecessary overhead. Each 
function retrieves the certificate independently using 
`SSL_get1_peer_certificate`/`SSL_get_peer_certificate`, which increments 
reference counts and requires parsing. If a Lua script calls multiple 
certificate getter functions (e.g., subject, issuer, serial), the same 
certificate will be retrieved and freed multiple times. Consider caching the 
certificate in the Lua context or providing a single function that returns all 
certificate fields as a Lua table to reduce overhead for common use cases.



##########
plugins/lua/ts_lua_client_request.cc:
##########
@@ -1169,6 +1203,927 @@ ts_lua_client_request_get_ssl_curve(lua_State *L)
   return 1;
 }
 
+// Certificate API Functions
+static void
+ts_lua_inject_client_request_cert_api(lua_State *L)
+{
+  // Client certificate functions
+  lua_pushcfunction(L, ts_lua_client_request_client_cert_get_pem);
+  lua_setfield(L, -2, "client_cert_get_pem");
+
+  lua_pushcfunction(L, ts_lua_client_request_client_cert_get_subject);
+  lua_setfield(L, -2, "client_cert_get_subject");
+
+  lua_pushcfunction(L, ts_lua_client_request_client_cert_get_issuer);
+  lua_setfield(L, -2, "client_cert_get_issuer");
+
+  lua_pushcfunction(L, ts_lua_client_request_client_cert_get_serial);
+  lua_setfield(L, -2, "client_cert_get_serial");
+
+  lua_pushcfunction(L, ts_lua_client_request_client_cert_get_signature);
+  lua_setfield(L, -2, "client_cert_get_signature");
+
+  lua_pushcfunction(L, ts_lua_client_request_client_cert_get_not_before);
+  lua_setfield(L, -2, "client_cert_get_not_before");
+
+  lua_pushcfunction(L, ts_lua_client_request_client_cert_get_not_after);
+  lua_setfield(L, -2, "client_cert_get_not_after");
+
+  lua_pushcfunction(L, ts_lua_client_request_client_cert_get_version);
+  lua_setfield(L, -2, "client_cert_get_version");
+
+  lua_pushcfunction(L, ts_lua_client_request_client_cert_get_san_dns);
+  lua_setfield(L, -2, "client_cert_get_san_dns");
+
+  lua_pushcfunction(L, ts_lua_client_request_client_cert_get_san_ip);
+  lua_setfield(L, -2, "client_cert_get_san_ip");
+
+  lua_pushcfunction(L, ts_lua_client_request_client_cert_get_san_email);
+  lua_setfield(L, -2, "client_cert_get_san_email");
+
+  lua_pushcfunction(L, ts_lua_client_request_client_cert_get_san_uri);
+  lua_setfield(L, -2, "client_cert_get_san_uri");
+
+  // Server certificate functions
+  lua_pushcfunction(L, ts_lua_client_request_server_cert_get_pem);
+  lua_setfield(L, -2, "server_cert_get_pem");
+
+  lua_pushcfunction(L, ts_lua_client_request_server_cert_get_subject);
+  lua_setfield(L, -2, "server_cert_get_subject");
+
+  lua_pushcfunction(L, ts_lua_client_request_server_cert_get_issuer);
+  lua_setfield(L, -2, "server_cert_get_issuer");
+
+  lua_pushcfunction(L, ts_lua_client_request_server_cert_get_serial);
+  lua_setfield(L, -2, "server_cert_get_serial");
+
+  lua_pushcfunction(L, ts_lua_client_request_server_cert_get_signature);
+  lua_setfield(L, -2, "server_cert_get_signature");
+
+  lua_pushcfunction(L, ts_lua_client_request_server_cert_get_not_before);
+  lua_setfield(L, -2, "server_cert_get_not_before");
+
+  lua_pushcfunction(L, ts_lua_client_request_server_cert_get_not_after);
+  lua_setfield(L, -2, "server_cert_get_not_after");
+
+  lua_pushcfunction(L, ts_lua_client_request_server_cert_get_version);
+  lua_setfield(L, -2, "server_cert_get_version");
+
+  lua_pushcfunction(L, ts_lua_client_request_server_cert_get_san_dns);
+  lua_setfield(L, -2, "server_cert_get_san_dns");
+
+  lua_pushcfunction(L, ts_lua_client_request_server_cert_get_san_ip);
+  lua_setfield(L, -2, "server_cert_get_san_ip");
+
+  lua_pushcfunction(L, ts_lua_client_request_server_cert_get_san_email);
+  lua_setfield(L, -2, "server_cert_get_san_email");
+
+  lua_pushcfunction(L, ts_lua_client_request_server_cert_get_san_uri);
+  lua_setfield(L, -2, "server_cert_get_san_uri");
+}
+
+// Client Certificate Functions
+static int
+ts_lua_client_request_client_cert_get_pem(lua_State *L)
+{
+  ts_lua_http_ctx *http_ctx;
+  TSHttpSsn        ssnp;
+  TSVConn          client_conn;
+
+  GET_HTTP_CONTEXT(http_ctx, L);
+
+  ssnp        = TSHttpTxnSsnGet(http_ctx->txnp);
+  client_conn = TSHttpSsnClientVConnGet(ssnp);
+
+  if (TSVConnIsSsl(client_conn)) {
+    TSSslConnection ssl_conn = TSVConnSslConnectionGet(client_conn);
+    if (ssl_conn) {
+      SSL *ssl = reinterpret_cast<SSL *>(ssl_conn);
+#ifdef OPENSSL_IS_OPENSSL3
+      X509 *cert = SSL_get1_peer_certificate(ssl);
+#else
+      X509 *cert = SSL_get_peer_certificate(ssl);
+#endif
+      if (cert) {
+        std::string pem = get_x509_pem_string(cert);
+        X509_free(cert);
+        if (!pem.empty()) {
+          lua_pushlstring(L, pem.c_str(), pem.length());
+          return 1;
+        }
+      }
+    }
+  }
+
+  lua_pushnil(L);
+  return 1;
+}
+
+static int
+ts_lua_client_request_client_cert_get_subject(lua_State *L)
+{
+  ts_lua_http_ctx *http_ctx;
+  TSHttpSsn        ssnp;
+  TSVConn          client_conn;
+
+  GET_HTTP_CONTEXT(http_ctx, L);
+
+  ssnp        = TSHttpTxnSsnGet(http_ctx->txnp);
+  client_conn = TSHttpSsnClientVConnGet(ssnp);
+
+  if (TSVConnIsSsl(client_conn)) {
+    TSSslConnection ssl_conn = TSVConnSslConnectionGet(client_conn);
+    if (ssl_conn) {
+      SSL *ssl = reinterpret_cast<SSL *>(ssl_conn);
+#ifdef OPENSSL_IS_OPENSSL3
+      X509 *cert = SSL_get1_peer_certificate(ssl);
+#else
+      X509 *cert = SSL_get_peer_certificate(ssl);
+#endif
+      if (cert) {
+        std::string subject = 
get_x509_name_string(X509_get_subject_name(cert));
+        X509_free(cert);
+        if (!subject.empty()) {
+          lua_pushlstring(L, subject.c_str(), subject.length());
+          return 1;
+        }
+      }
+    }
+  }
+
+  lua_pushnil(L);
+  return 1;
+}
+
+static int
+ts_lua_client_request_client_cert_get_issuer(lua_State *L)
+{
+  ts_lua_http_ctx *http_ctx;
+  TSHttpSsn        ssnp;
+  TSVConn          client_conn;
+
+  GET_HTTP_CONTEXT(http_ctx, L);
+
+  ssnp        = TSHttpTxnSsnGet(http_ctx->txnp);
+  client_conn = TSHttpSsnClientVConnGet(ssnp);
+
+  if (TSVConnIsSsl(client_conn)) {
+    TSSslConnection ssl_conn = TSVConnSslConnectionGet(client_conn);
+    if (ssl_conn) {
+      SSL *ssl = reinterpret_cast<SSL *>(ssl_conn);
+#ifdef OPENSSL_IS_OPENSSL3
+      X509 *cert = SSL_get1_peer_certificate(ssl);
+#else
+      X509 *cert = SSL_get_peer_certificate(ssl);
+#endif
+      if (cert) {
+        std::string issuer = get_x509_name_string(X509_get_issuer_name(cert));
+        X509_free(cert);
+        if (!issuer.empty()) {
+          lua_pushlstring(L, issuer.c_str(), issuer.length());
+          return 1;
+        }
+      }
+    }
+  }
+
+  lua_pushnil(L);
+  return 1;
+}
+
+static int
+ts_lua_client_request_client_cert_get_serial(lua_State *L)
+{
+  ts_lua_http_ctx *http_ctx;
+  TSHttpSsn        ssnp;
+  TSVConn          client_conn;
+
+  GET_HTTP_CONTEXT(http_ctx, L);
+
+  ssnp        = TSHttpTxnSsnGet(http_ctx->txnp);
+  client_conn = TSHttpSsnClientVConnGet(ssnp);
+
+  if (TSVConnIsSsl(client_conn)) {
+    TSSslConnection ssl_conn = TSVConnSslConnectionGet(client_conn);
+    if (ssl_conn) {
+      SSL *ssl = reinterpret_cast<SSL *>(ssl_conn);
+#ifdef OPENSSL_IS_OPENSSL3
+      X509 *cert = SSL_get1_peer_certificate(ssl);
+#else
+      X509 *cert = SSL_get_peer_certificate(ssl);
+#endif
+      if (cert) {
+        std::string serial = get_x509_serial_string(cert);
+        X509_free(cert);
+        if (!serial.empty()) {
+          lua_pushlstring(L, serial.c_str(), serial.length());
+          return 1;
+        }
+      }
+    }
+  }
+
+  lua_pushnil(L);
+  return 1;
+}
+
+static int
+ts_lua_client_request_client_cert_get_signature(lua_State *L)
+{
+  ts_lua_http_ctx *http_ctx;
+  TSHttpSsn        ssnp;
+  TSVConn          client_conn;
+
+  GET_HTTP_CONTEXT(http_ctx, L);
+
+  ssnp        = TSHttpTxnSsnGet(http_ctx->txnp);
+  client_conn = TSHttpSsnClientVConnGet(ssnp);
+
+  if (TSVConnIsSsl(client_conn)) {
+    TSSslConnection ssl_conn = TSVConnSslConnectionGet(client_conn);
+    if (ssl_conn) {
+      SSL *ssl = reinterpret_cast<SSL *>(ssl_conn);
+#ifdef OPENSSL_IS_OPENSSL3
+      X509 *cert = SSL_get1_peer_certificate(ssl);
+#else
+      X509 *cert = SSL_get_peer_certificate(ssl);
+#endif
+      if (cert) {
+        std::string sig = get_x509_signature_string(cert);
+        X509_free(cert);
+        if (!sig.empty()) {
+          lua_pushlstring(L, sig.c_str(), sig.length());
+          return 1;
+        }
+      }
+    }
+  }
+
+  lua_pushnil(L);
+  return 1;
+}
+
+static int
+ts_lua_client_request_client_cert_get_not_before(lua_State *L)
+{
+  ts_lua_http_ctx *http_ctx;
+  TSHttpSsn        ssnp;
+  TSVConn          client_conn;
+
+  GET_HTTP_CONTEXT(http_ctx, L);
+
+  ssnp        = TSHttpTxnSsnGet(http_ctx->txnp);
+  client_conn = TSHttpSsnClientVConnGet(ssnp);
+
+  if (TSVConnIsSsl(client_conn)) {
+    TSSslConnection ssl_conn = TSVConnSslConnectionGet(client_conn);
+    if (ssl_conn) {
+      SSL *ssl = reinterpret_cast<SSL *>(ssl_conn);
+#ifdef OPENSSL_IS_OPENSSL3
+      X509 *cert = SSL_get1_peer_certificate(ssl);
+#else
+      X509 *cert = SSL_get_peer_certificate(ssl);
+#endif
+      if (cert) {
+        std::string not_before = 
get_x509_time_string(X509_get_notBefore(cert));
+        X509_free(cert);
+        if (!not_before.empty()) {
+          lua_pushlstring(L, not_before.c_str(), not_before.length());
+          return 1;
+        }
+      }
+    }
+  }
+
+  lua_pushnil(L);
+  return 1;
+}
+
+static int
+ts_lua_client_request_client_cert_get_not_after(lua_State *L)
+{
+  ts_lua_http_ctx *http_ctx;
+  TSHttpSsn        ssnp;
+  TSVConn          client_conn;
+
+  GET_HTTP_CONTEXT(http_ctx, L);
+
+  ssnp        = TSHttpTxnSsnGet(http_ctx->txnp);
+  client_conn = TSHttpSsnClientVConnGet(ssnp);
+
+  if (TSVConnIsSsl(client_conn)) {
+    TSSslConnection ssl_conn = TSVConnSslConnectionGet(client_conn);
+    if (ssl_conn) {
+      SSL *ssl = reinterpret_cast<SSL *>(ssl_conn);
+#ifdef OPENSSL_IS_OPENSSL3
+      X509 *cert = SSL_get1_peer_certificate(ssl);
+#else
+      X509 *cert = SSL_get_peer_certificate(ssl);
+#endif
+      if (cert) {
+        std::string not_after = get_x509_time_string(X509_get_notAfter(cert));
+        X509_free(cert);
+        if (!not_after.empty()) {
+          lua_pushlstring(L, not_after.c_str(), not_after.length());
+          return 1;
+        }
+      }
+    }
+  }
+
+  lua_pushnil(L);
+  return 1;
+}
+
+static int
+ts_lua_client_request_client_cert_get_version(lua_State *L)
+{
+  ts_lua_http_ctx *http_ctx;
+  TSHttpSsn        ssnp;
+  TSVConn          client_conn;
+
+  GET_HTTP_CONTEXT(http_ctx, L);
+
+  ssnp        = TSHttpTxnSsnGet(http_ctx->txnp);
+  client_conn = TSHttpSsnClientVConnGet(ssnp);
+
+  if (TSVConnIsSsl(client_conn)) {
+    TSSslConnection ssl_conn = TSVConnSslConnectionGet(client_conn);
+    if (ssl_conn) {
+      SSL *ssl = reinterpret_cast<SSL *>(ssl_conn);
+#ifdef OPENSSL_IS_OPENSSL3
+      X509 *cert = SSL_get1_peer_certificate(ssl);
+#else
+      X509 *cert = SSL_get_peer_certificate(ssl);
+#endif
+      if (cert) {
+        long version = X509_get_version(cert);
+        X509_free(cert);
+        lua_pushinteger(L, version);
+        return 1;
+      }
+    }
+  }
+
+  lua_pushnil(L);
+  return 1;
+}
+
+static int
+ts_lua_client_request_client_cert_get_san_dns(lua_State *L)
+{
+  ts_lua_http_ctx *http_ctx;
+  TSHttpSsn        ssnp;
+  TSVConn          client_conn;
+
+  GET_HTTP_CONTEXT(http_ctx, L);
+
+  ssnp        = TSHttpTxnSsnGet(http_ctx->txnp);
+  client_conn = TSHttpSsnClientVConnGet(ssnp);
+
+  if (TSVConnIsSsl(client_conn)) {
+    TSSslConnection ssl_conn = TSVConnSslConnectionGet(client_conn);
+    if (ssl_conn) {
+      SSL *ssl = reinterpret_cast<SSL *>(ssl_conn);
+#ifdef OPENSSL_IS_OPENSSL3
+      X509 *cert = SSL_get1_peer_certificate(ssl);
+#else
+      X509 *cert = SSL_get_peer_certificate(ssl);
+#endif
+      if (cert) {
+        std::vector<std::string> dns_names = get_x509_san_strings(cert, 
GEN_DNS);
+        X509_free(cert);
+
+        if (!dns_names.empty()) {
+          lua_newtable(L);
+          for (size_t i = 0; i < dns_names.size(); i++) {
+            lua_pushlstring(L, dns_names[i].c_str(), dns_names[i].length());
+            lua_rawseti(L, -2, i + 1);
+          }
+          return 1;
+        }
+      }
+    }
+  }
+
+  lua_pushnil(L);
+  return 1;
+}
+
+static int
+ts_lua_client_request_client_cert_get_san_ip(lua_State *L)
+{
+  ts_lua_http_ctx *http_ctx;
+  TSHttpSsn        ssnp;
+  TSVConn          client_conn;
+
+  GET_HTTP_CONTEXT(http_ctx, L);
+
+  ssnp        = TSHttpTxnSsnGet(http_ctx->txnp);
+  client_conn = TSHttpSsnClientVConnGet(ssnp);
+
+  if (TSVConnIsSsl(client_conn)) {
+    TSSslConnection ssl_conn = TSVConnSslConnectionGet(client_conn);
+    if (ssl_conn) {
+      SSL *ssl = reinterpret_cast<SSL *>(ssl_conn);
+#ifdef OPENSSL_IS_OPENSSL3
+      X509 *cert = SSL_get1_peer_certificate(ssl);
+#else
+      X509 *cert = SSL_get_peer_certificate(ssl);
+#endif
+      if (cert) {
+        std::vector<std::string> ip_addrs = get_x509_san_strings(cert, 
GEN_IPADD);
+        X509_free(cert);
+
+        if (!ip_addrs.empty()) {
+          lua_newtable(L);
+          for (size_t i = 0; i < ip_addrs.size(); i++) {
+            lua_pushlstring(L, ip_addrs[i].c_str(), ip_addrs[i].length());
+            lua_rawseti(L, -2, i + 1);
+          }
+          return 1;
+        }
+      }
+    }
+  }
+
+  lua_pushnil(L);
+  return 1;
+}
+
+static int
+ts_lua_client_request_client_cert_get_san_email(lua_State *L)
+{
+  ts_lua_http_ctx *http_ctx;
+  TSHttpSsn        ssnp;
+  TSVConn          client_conn;
+
+  GET_HTTP_CONTEXT(http_ctx, L);
+
+  ssnp        = TSHttpTxnSsnGet(http_ctx->txnp);
+  client_conn = TSHttpSsnClientVConnGet(ssnp);
+
+  if (TSVConnIsSsl(client_conn)) {
+    TSSslConnection ssl_conn = TSVConnSslConnectionGet(client_conn);
+    if (ssl_conn) {
+      SSL *ssl = reinterpret_cast<SSL *>(ssl_conn);
+#ifdef OPENSSL_IS_OPENSSL3
+      X509 *cert = SSL_get1_peer_certificate(ssl);
+#else
+      X509 *cert = SSL_get_peer_certificate(ssl);
+#endif
+      if (cert) {
+        std::vector<std::string> emails = get_x509_san_strings(cert, 
GEN_EMAIL);
+        X509_free(cert);
+
+        if (!emails.empty()) {
+          lua_newtable(L);
+          for (size_t i = 0; i < emails.size(); i++) {
+            lua_pushlstring(L, emails[i].c_str(), emails[i].length());
+            lua_rawseti(L, -2, i + 1);
+          }
+          return 1;
+        }
+      }
+    }
+  }
+
+  lua_pushnil(L);
+  return 1;
+}
+
+static int
+ts_lua_client_request_client_cert_get_san_uri(lua_State *L)
+{
+  ts_lua_http_ctx *http_ctx;
+  TSHttpSsn        ssnp;
+  TSVConn          client_conn;
+
+  GET_HTTP_CONTEXT(http_ctx, L);
+
+  ssnp        = TSHttpTxnSsnGet(http_ctx->txnp);
+  client_conn = TSHttpSsnClientVConnGet(ssnp);
+
+  if (TSVConnIsSsl(client_conn)) {
+    TSSslConnection ssl_conn = TSVConnSslConnectionGet(client_conn);
+    if (ssl_conn) {
+      SSL *ssl = reinterpret_cast<SSL *>(ssl_conn);
+#ifdef OPENSSL_IS_OPENSSL3
+      X509 *cert = SSL_get1_peer_certificate(ssl);
+#else
+      X509 *cert = SSL_get_peer_certificate(ssl);
+#endif
+      if (cert) {
+        std::vector<std::string> uris = get_x509_san_strings(cert, GEN_URI);
+        X509_free(cert);
+
+        if (!uris.empty()) {
+          lua_newtable(L);
+          for (size_t i = 0; i < uris.size(); i++) {
+            lua_pushlstring(L, uris[i].c_str(), uris[i].length());
+            lua_rawseti(L, -2, i + 1);
+          }
+          return 1;
+        }
+      }
+    }
+  }
+
+  lua_pushnil(L);
+  return 1;
+}
+
+// Server Certificate Functions
+static int
+ts_lua_client_request_server_cert_get_pem(lua_State *L)
+{
+  ts_lua_http_ctx *http_ctx;
+  TSHttpSsn        ssnp;
+  TSVConn          client_conn;
+
+  GET_HTTP_CONTEXT(http_ctx, L);
+
+  ssnp        = TSHttpTxnSsnGet(http_ctx->txnp);
+  client_conn = TSHttpSsnClientVConnGet(ssnp);
+
+  if (TSVConnIsSsl(client_conn)) {
+    TSSslConnection ssl_conn = TSVConnSslConnectionGet(client_conn);
+    if (ssl_conn) {
+      SSL  *ssl  = reinterpret_cast<SSL *>(ssl_conn);
+      X509 *cert = SSL_get_certificate(ssl);
+      if (cert) {
+        std::string pem = get_x509_pem_string(cert);
+        if (!pem.empty()) {
+          lua_pushlstring(L, pem.c_str(), pem.length());
+          return 1;
+        }
+      }
+    }
+  }
+
+  lua_pushnil(L);
+  return 1;
+}
+
+static int
+ts_lua_client_request_server_cert_get_subject(lua_State *L)
+{
+  ts_lua_http_ctx *http_ctx;
+  TSHttpSsn        ssnp;
+  TSVConn          client_conn;
+
+  GET_HTTP_CONTEXT(http_ctx, L);
+
+  ssnp        = TSHttpTxnSsnGet(http_ctx->txnp);
+  client_conn = TSHttpSsnClientVConnGet(ssnp);
+
+  if (TSVConnIsSsl(client_conn)) {
+    TSSslConnection ssl_conn = TSVConnSslConnectionGet(client_conn);
+    if (ssl_conn) {
+      SSL  *ssl  = reinterpret_cast<SSL *>(ssl_conn);
+      X509 *cert = SSL_get_certificate(ssl);
+      if (cert) {
+        std::string subject = 
get_x509_name_string(X509_get_subject_name(cert));
+        if (!subject.empty()) {
+          lua_pushlstring(L, subject.c_str(), subject.length());
+          return 1;
+        }
+      }
+    }
+  }
+
+  lua_pushnil(L);
+  return 1;
+}
+
+static int
+ts_lua_client_request_server_cert_get_issuer(lua_State *L)
+{
+  ts_lua_http_ctx *http_ctx;
+  TSHttpSsn        ssnp;
+  TSVConn          client_conn;
+
+  GET_HTTP_CONTEXT(http_ctx, L);
+
+  ssnp        = TSHttpTxnSsnGet(http_ctx->txnp);
+  client_conn = TSHttpSsnClientVConnGet(ssnp);
+
+  if (TSVConnIsSsl(client_conn)) {
+    TSSslConnection ssl_conn = TSVConnSslConnectionGet(client_conn);
+    if (ssl_conn) {
+      SSL  *ssl  = reinterpret_cast<SSL *>(ssl_conn);
+      X509 *cert = SSL_get_certificate(ssl);
+      if (cert) {
+        std::string issuer = get_x509_name_string(X509_get_issuer_name(cert));
+        if (!issuer.empty()) {
+          lua_pushlstring(L, issuer.c_str(), issuer.length());
+          return 1;
+        }
+      }
+    }
+  }
+
+  lua_pushnil(L);
+  return 1;
+}
+
+static int
+ts_lua_client_request_server_cert_get_serial(lua_State *L)
+{
+  ts_lua_http_ctx *http_ctx;
+  TSHttpSsn        ssnp;
+  TSVConn          client_conn;
+
+  GET_HTTP_CONTEXT(http_ctx, L);
+
+  ssnp        = TSHttpTxnSsnGet(http_ctx->txnp);
+  client_conn = TSHttpSsnClientVConnGet(ssnp);
+
+  if (TSVConnIsSsl(client_conn)) {
+    TSSslConnection ssl_conn = TSVConnSslConnectionGet(client_conn);
+    if (ssl_conn) {
+      SSL  *ssl  = reinterpret_cast<SSL *>(ssl_conn);
+      X509 *cert = SSL_get_certificate(ssl);
+      if (cert) {
+        std::string serial = get_x509_serial_string(cert);
+        if (!serial.empty()) {
+          lua_pushlstring(L, serial.c_str(), serial.length());
+          return 1;
+        }
+      }
+    }
+  }
+
+  lua_pushnil(L);
+  return 1;
+}
+
+static int
+ts_lua_client_request_server_cert_get_signature(lua_State *L)
+{
+  ts_lua_http_ctx *http_ctx;
+  TSHttpSsn        ssnp;
+  TSVConn          client_conn;
+
+  GET_HTTP_CONTEXT(http_ctx, L);
+
+  ssnp        = TSHttpTxnSsnGet(http_ctx->txnp);
+  client_conn = TSHttpSsnClientVConnGet(ssnp);
+
+  if (TSVConnIsSsl(client_conn)) {
+    TSSslConnection ssl_conn = TSVConnSslConnectionGet(client_conn);
+    if (ssl_conn) {
+      SSL  *ssl  = reinterpret_cast<SSL *>(ssl_conn);
+      X509 *cert = SSL_get_certificate(ssl);
+      if (cert) {
+        std::string sig = get_x509_signature_string(cert);
+        if (!sig.empty()) {
+          lua_pushlstring(L, sig.c_str(), sig.length());
+          return 1;
+        }
+      }
+    }
+  }
+
+  lua_pushnil(L);
+  return 1;
+}
+
+static int
+ts_lua_client_request_server_cert_get_not_before(lua_State *L)
+{
+  ts_lua_http_ctx *http_ctx;
+  TSHttpSsn        ssnp;
+  TSVConn          client_conn;
+
+  GET_HTTP_CONTEXT(http_ctx, L);
+
+  ssnp        = TSHttpTxnSsnGet(http_ctx->txnp);
+  client_conn = TSHttpSsnClientVConnGet(ssnp);
+
+  if (TSVConnIsSsl(client_conn)) {
+    TSSslConnection ssl_conn = TSVConnSslConnectionGet(client_conn);
+    if (ssl_conn) {
+      SSL  *ssl  = reinterpret_cast<SSL *>(ssl_conn);
+      X509 *cert = SSL_get_certificate(ssl);
+      if (cert) {
+        std::string not_before = 
get_x509_time_string(X509_get_notBefore(cert));
+        if (!not_before.empty()) {
+          lua_pushlstring(L, not_before.c_str(), not_before.length());
+          return 1;
+        }
+      }
+    }
+  }
+
+  lua_pushnil(L);
+  return 1;
+}
+
+static int
+ts_lua_client_request_server_cert_get_not_after(lua_State *L)
+{
+  ts_lua_http_ctx *http_ctx;
+  TSHttpSsn        ssnp;
+  TSVConn          client_conn;
+
+  GET_HTTP_CONTEXT(http_ctx, L);
+
+  ssnp        = TSHttpTxnSsnGet(http_ctx->txnp);
+  client_conn = TSHttpSsnClientVConnGet(ssnp);
+
+  if (TSVConnIsSsl(client_conn)) {
+    TSSslConnection ssl_conn = TSVConnSslConnectionGet(client_conn);
+    if (ssl_conn) {
+      SSL  *ssl  = reinterpret_cast<SSL *>(ssl_conn);
+      X509 *cert = SSL_get_certificate(ssl);
+      if (cert) {
+        std::string not_after = get_x509_time_string(X509_get_notAfter(cert));
+        if (!not_after.empty()) {
+          lua_pushlstring(L, not_after.c_str(), not_after.length());
+          return 1;
+        }
+      }
+    }
+  }
+
+  lua_pushnil(L);
+  return 1;
+}
+
+static int
+ts_lua_client_request_server_cert_get_version(lua_State *L)
+{
+  ts_lua_http_ctx *http_ctx;
+  TSHttpSsn        ssnp;
+  TSVConn          client_conn;
+
+  GET_HTTP_CONTEXT(http_ctx, L);
+
+  ssnp        = TSHttpTxnSsnGet(http_ctx->txnp);
+  client_conn = TSHttpSsnClientVConnGet(ssnp);
+
+  if (TSVConnIsSsl(client_conn)) {
+    TSSslConnection ssl_conn = TSVConnSslConnectionGet(client_conn);
+    if (ssl_conn) {
+      SSL  *ssl  = reinterpret_cast<SSL *>(ssl_conn);
+      X509 *cert = SSL_get_certificate(ssl);
+      if (cert) {
+        long version = X509_get_version(cert);
+        lua_pushinteger(L, version);
+        return 1;
+      }
+    }
+  }
+
+  lua_pushnil(L);
+  return 1;
+}
+
+static int
+ts_lua_client_request_server_cert_get_san_dns(lua_State *L)
+{
+  ts_lua_http_ctx *http_ctx;
+  TSHttpSsn        ssnp;
+  TSVConn          client_conn;
+
+  GET_HTTP_CONTEXT(http_ctx, L);
+
+  ssnp        = TSHttpTxnSsnGet(http_ctx->txnp);
+  client_conn = TSHttpSsnClientVConnGet(ssnp);
+
+  if (TSVConnIsSsl(client_conn)) {
+    TSSslConnection ssl_conn = TSVConnSslConnectionGet(client_conn);
+    if (ssl_conn) {
+      SSL  *ssl  = reinterpret_cast<SSL *>(ssl_conn);
+      X509 *cert = SSL_get_certificate(ssl);
+      if (cert) {
+        std::vector<std::string> dns_names = get_x509_san_strings(cert, 
GEN_DNS);
+
+        if (!dns_names.empty()) {
+          lua_newtable(L);
+          for (size_t i = 0; i < dns_names.size(); i++) {
+            lua_pushlstring(L, dns_names[i].c_str(), dns_names[i].length());
+            lua_rawseti(L, -2, i + 1);
+          }
+          return 1;
+        }
+      }
+    }
+  }
+
+  lua_pushnil(L);
+  return 1;
+}
+
+static int
+ts_lua_client_request_server_cert_get_san_ip(lua_State *L)
+{
+  ts_lua_http_ctx *http_ctx;
+  TSHttpSsn        ssnp;
+  TSVConn          client_conn;
+
+  GET_HTTP_CONTEXT(http_ctx, L);
+
+  ssnp        = TSHttpTxnSsnGet(http_ctx->txnp);
+  client_conn = TSHttpSsnClientVConnGet(ssnp);
+
+  if (TSVConnIsSsl(client_conn)) {
+    TSSslConnection ssl_conn = TSVConnSslConnectionGet(client_conn);
+    if (ssl_conn) {
+      SSL  *ssl  = reinterpret_cast<SSL *>(ssl_conn);
+      X509 *cert = SSL_get_certificate(ssl);
+      if (cert) {
+        std::vector<std::string> ip_addrs = get_x509_san_strings(cert, 
GEN_IPADD);
+
+        if (!ip_addrs.empty()) {
+          lua_newtable(L);
+          for (size_t i = 0; i < ip_addrs.size(); i++) {
+            lua_pushlstring(L, ip_addrs[i].c_str(), ip_addrs[i].length());
+            lua_rawseti(L, -2, i + 1);
+          }
+          return 1;
+        }
+      }
+    }
+  }
+
+  lua_pushnil(L);
+  return 1;
+}
+
+static int
+ts_lua_client_request_server_cert_get_san_email(lua_State *L)
+{
+  ts_lua_http_ctx *http_ctx;
+  TSHttpSsn        ssnp;
+  TSVConn          client_conn;
+
+  GET_HTTP_CONTEXT(http_ctx, L);
+
+  ssnp        = TSHttpTxnSsnGet(http_ctx->txnp);
+  client_conn = TSHttpSsnClientVConnGet(ssnp);
+
+  if (TSVConnIsSsl(client_conn)) {
+    TSSslConnection ssl_conn = TSVConnSslConnectionGet(client_conn);
+    if (ssl_conn) {
+      SSL  *ssl  = reinterpret_cast<SSL *>(ssl_conn);
+      X509 *cert = SSL_get_certificate(ssl);
+      if (cert) {
+        std::vector<std::string> emails = get_x509_san_strings(cert, 
GEN_EMAIL);
+
+        if (!emails.empty()) {
+          lua_newtable(L);
+          for (size_t i = 0; i < emails.size(); i++) {
+            lua_pushlstring(L, emails[i].c_str(), emails[i].length());
+            lua_rawseti(L, -2, i + 1);
+          }
+          return 1;
+        }
+      }
+    }
+  }
+
+  lua_pushnil(L);
+  return 1;
+}
+
+static int
+ts_lua_client_request_server_cert_get_san_uri(lua_State *L)
+{
+  ts_lua_http_ctx *http_ctx;
+  TSHttpSsn        ssnp;
+  TSVConn          client_conn;
+
+  GET_HTTP_CONTEXT(http_ctx, L);
+
+  ssnp        = TSHttpTxnSsnGet(http_ctx->txnp);
+  client_conn = TSHttpSsnClientVConnGet(ssnp);
+
+  if (TSVConnIsSsl(client_conn)) {
+    TSSslConnection ssl_conn = TSVConnSslConnectionGet(client_conn);
+    if (ssl_conn) {
+      SSL  *ssl  = reinterpret_cast<SSL *>(ssl_conn);
+      X509 *cert = SSL_get_certificate(ssl);
+      if (cert) {
+        std::vector<std::string> uris = get_x509_san_strings(cert, GEN_URI);
+
+        if (!uris.empty()) {
+          lua_newtable(L);
+          for (size_t i = 0; i < uris.size(); i++) {
+            lua_pushlstring(L, uris[i].c_str(), uris[i].length());
+            lua_rawseti(L, -2, i + 1);
+          }
+          return 1;
+        }
+      }
+    }
+  }
+
+  lua_pushnil(L);
+  return 1;
+}

Review Comment:
   [nitpick] Significant code duplication between client and server certificate 
functions. Each pair of functions (e.g., `client_cert_get_pem` vs 
`server_cert_get_pem`) differs only in how the certificate is retrieved: client 
certificates use `SSL_get1_peer_certificate`/`SSL_get_peer_certificate` with 
`X509_free`, while server certificates use `SSL_get_certificate` without 
freeing. Consider refactoring to use a helper function that takes a certificate 
type parameter to reduce the ~900 lines of duplicated code and improve 
maintainability.



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