plugins/lua/ts_lua_server_request.cc

/*
  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.
*/

#include <netinet/in.h>
#include <arpa/inet.h>
#include <sys/socket.h>
#include "ts_lua_util.h"

#define TS_LUA_CHECK_SERVER_REQUEST_HDR(http_ctx)                                                                                \
  do {                                                                                                                           \
    if (!http_ctx->server_request_hdrp) {                                                                                        \
      if (TSHttpTxnServerReqGet(http_ctx->txnp, &http_ctx->server_request_bufp, &http_ctx->server_request_hdrp) != TS_SUCCESS) { \
        return 0;                                                                                                                \
      }                                                                                                                          \
    }                                                                                                                            \
  } while (0)

#define TS_LUA_CHECK_SERVER_REQUEST_URL(http_ctx)                                                                         \
  do {                                                                                                                    \
    if (!http_ctx->server_request_url) {                                                                                  \
      TS_LUA_CHECK_SERVER_REQUEST_HDR(http_ctx);                                                                          \
      if (TSHttpHdrUrlGet(http_ctx->server_request_bufp, http_ctx->server_request_hdrp, &http_ctx->server_request_url) != \
          TS_SUCCESS) {                                                                                                   \
        return 0;                                                                                                         \
      }                                                                                                                   \
    }                                                                                                                     \
  } while (0)

static void ts_lua_inject_server_request_server_addr_api(lua_State *L);

static void ts_lua_inject_server_request_socket_api(lua_State *L);
static void ts_lua_inject_server_request_header_api(lua_State *L);
static void ts_lua_inject_server_request_header_table_api(lua_State *L);
static void ts_lua_inject_server_request_headers_api(lua_State *L);
static void ts_lua_inject_server_request_get_header_size_api(lua_State *L);
static void ts_lua_inject_server_request_get_body_size_api(lua_State *L);
static void ts_lua_inject_server_request_uri_api(lua_State *L);
static void ts_lua_inject_server_request_uri_args_api(lua_State *L);
static void ts_lua_inject_server_request_url_api(lua_State *L);
static void ts_lua_inject_server_request_method_api(lua_State *L);

static int ts_lua_server_request_header_get(lua_State *L);
static int ts_lua_server_request_header_set(lua_State *L);
static int ts_lua_server_request_header_table_get(lua_State *L);
static int ts_lua_server_request_header_table_set(lua_State *L);
static int ts_lua_server_request_get_headers(lua_State *L);
static int ts_lua_server_request_get_header_size(lua_State *L);
static int ts_lua_server_request_get_body_size(lua_State *L);
static int ts_lua_server_request_get_uri(lua_State *L);
static int ts_lua_server_request_set_uri(lua_State *L);
static int ts_lua_server_request_set_uri_args(lua_State *L);
static int ts_lua_server_request_get_uri_args(lua_State *L);
static int ts_lua_server_request_get_method(lua_State *L);
static int ts_lua_server_request_set_method(lua_State *L);
static int ts_lua_server_request_get_url_host(lua_State *L);
static int ts_lua_server_request_set_url_host(lua_State *L);
static int ts_lua_server_request_get_url_scheme(lua_State *L);
static int ts_lua_server_request_set_url_scheme(lua_State *L);
static int ts_lua_server_request_get_version(lua_State *L);
static int ts_lua_server_request_set_version(lua_State *L);

static int ts_lua_server_request_server_addr_get_ip(lua_State *L);
static int ts_lua_server_request_server_addr_get_port(lua_State *L);
static int ts_lua_server_request_server_addr_get_addr(lua_State *L);
static int ts_lua_server_request_server_addr_set_addr(lua_State *L);
static int ts_lua_server_request_server_addr_get_outgoing_port(lua_State *L);
static int ts_lua_server_request_server_addr_set_outgoing_addr(lua_State *L);
static int ts_lua_server_request_server_addr_get_nexthop_addr(lua_State *L);
static int ts_lua_server_request_server_addr_get_nexthop_name(lua_State *L);
static int ts_lua_server_request_server_addr_get_nexthop_port(lua_State *L);

void
ts_lua_inject_server_request_api(lua_State *L)
{
  lua_newtable(L);

  ts_lua_inject_server_request_socket_api(L);
  ts_lua_inject_server_request_header_api(L);
  ts_lua_inject_server_request_header_table_api(L);
  ts_lua_inject_server_request_headers_api(L);
  ts_lua_inject_server_request_get_header_size_api(L);
  ts_lua_inject_server_request_get_body_size_api(L);
  ts_lua_inject_server_request_method_api(L);
  ts_lua_inject_server_request_uri_api(L);
  ts_lua_inject_server_request_uri_args_api(L);

  ts_lua_inject_server_request_url_api(L);

  lua_setfield(L, -2, "server_request");
}

static void
ts_lua_inject_server_request_socket_api(lua_State *L)
{
  ts_lua_inject_server_request_server_addr_api(L);
}

static void
ts_lua_inject_server_request_server_addr_api(lua_State *L)
{
  lua_newtable(L);

  lua_pushcfunction(L, ts_lua_server_request_server_addr_get_ip);
  lua_setfield(L, -2, "get_ip");

  lua_pushcfunction(L, ts_lua_server_request_server_addr_get_port);
  lua_setfield(L, -2, "get_port");

  lua_pushcfunction(L, ts_lua_server_request_server_addr_get_addr);
  lua_setfield(L, -2, "get_addr");

  lua_pushcfunction(L, ts_lua_server_request_server_addr_set_addr);
  lua_setfield(L, -2, "set_addr");

  lua_pushcfunction(L, ts_lua_server_request_server_addr_get_outgoing_port);
  lua_setfield(L, -2, "get_outgoing_port");

  lua_pushcfunction(L, ts_lua_server_request_server_addr_set_outgoing_addr);
  lua_setfield(L, -2, "set_outgoing_addr");

  lua_pushcfunction(L, ts_lua_server_request_server_addr_get_nexthop_addr);
  lua_setfield(L, -2, "get_nexthop_addr");

  lua_pushcfunction(L, ts_lua_server_request_server_addr_get_nexthop_name);
  lua_setfield(L, -2, "get_nexthop_name");

  lua_pushcfunction(L, ts_lua_server_request_server_addr_get_nexthop_port);
  lua_setfield(L, -2, "get_nexthop_port");

  lua_setfield(L, -2, "server_addr");

  lua_pushinteger(L, AF_INET);
  lua_setglobal(L, "TS_LUA_AF_INET");

  lua_pushinteger(L, AF_INET6);
  lua_setglobal(L, "TS_LUA_AF_INET6");

  lua_pushinteger(L, AF_UNIX);
  lua_setglobal(L, "TS_LUA_AF_UNIX");
}

static void
ts_lua_inject_server_request_header_api(lua_State *L)
{
  lua_newtable(L); /* .header */

  lua_createtable(L, 0, 2); /* metatable for .header */

  lua_pushcfunction(L, ts_lua_server_request_header_get);
  lua_setfield(L, -2, "__index");
  lua_pushcfunction(L, ts_lua_server_request_header_set);
  lua_setfield(L, -2, "__newindex");

  lua_setmetatable(L, -2);

  lua_setfield(L, -2, "header");
}

static int
ts_lua_server_request_header_get(lua_State *L)
{
  const char *key;
  const char *val;
  int         val_len;
  size_t      key_len;
  int         count;

  TSMLoc           field_loc, next_field_loc;
  ts_lua_http_ctx *http_ctx;

  GET_HTTP_CONTEXT(http_ctx, L);

  /*  we skip the first argument that is the table */
  key = luaL_checklstring(L, 2, &key_len);

  if (!http_ctx->server_request_hdrp) {
    if (TSHttpTxnServerReqGet(http_ctx->txnp, &http_ctx->server_request_bufp, &http_ctx->server_request_hdrp) != TS_SUCCESS) {
      lua_pushnil(L);
      return 1;
    }
  }

  if (key && key_len) {
    field_loc = TSMimeHdrFieldFind(http_ctx->server_request_bufp, http_ctx->server_request_hdrp, key, key_len);

    if (field_loc != TS_NULL_MLOC) {
      count = 0;
      while (field_loc != TS_NULL_MLOC) {
        val = TSMimeHdrFieldValueStringGet(http_ctx->server_request_bufp, http_ctx->server_request_hdrp, field_loc, -1, &val_len);
        next_field_loc = TSMimeHdrFieldNextDup(http_ctx->server_request_bufp, http_ctx->server_request_hdrp, field_loc);
        lua_pushlstring(L, val, val_len);
        count++;
        // multiple headers with the same name must be semantically the same as one value which is comma separated
        if (next_field_loc != TS_NULL_MLOC) {
          lua_pushlstring(L, ",", 1);
          count++;
        }
        TSHandleMLocRelease(http_ctx->server_request_bufp, http_ctx->server_request_hdrp, field_loc);
        field_loc = next_field_loc;
      }
      lua_concat(L, count);
    } else {
      lua_pushnil(L);
    }

  } else {
    lua_pushnil(L);
  }

  return 1;
}

static int
ts_lua_server_request_header_set(lua_State *L)
{
  const char *key;
  const char *val;
  size_t      val_len;
  size_t      key_len;
  int         remove;
  int         first;

  TSMLoc field_loc, tmp;

  ts_lua_http_ctx *http_ctx;

  GET_HTTP_CONTEXT(http_ctx, L);

  remove = 0;
  val    = nullptr;

  /*   we skip the first argument that is the table */
  key = luaL_checklstring(L, 2, &key_len);
  if (lua_isnil(L, 3)) {
    remove = 1;
  } else {
    val = luaL_checklstring(L, 3, &val_len);
  }

  if (!http_ctx->server_request_hdrp) {
    if (TSHttpTxnServerReqGet(http_ctx->txnp, &http_ctx->server_request_bufp, &http_ctx->server_request_hdrp) != TS_SUCCESS) {
      return 0;
    }
  }

  field_loc = TSMimeHdrFieldFind(http_ctx->server_request_bufp, http_ctx->server_request_hdrp, key, key_len);

  if (remove) {
    while (field_loc != TS_NULL_MLOC) {
      tmp = TSMimeHdrFieldNextDup(http_ctx->server_request_bufp, http_ctx->server_request_hdrp, field_loc);
      TSMimeHdrFieldDestroy(http_ctx->server_request_bufp, http_ctx->server_request_hdrp, field_loc);
      TSHandleMLocRelease(http_ctx->server_request_bufp, http_ctx->server_request_hdrp, field_loc);
      field_loc = tmp;
    }
  } else if (field_loc != TS_NULL_MLOC) {
    first = 1;
    while (field_loc != TS_NULL_MLOC) {
      tmp = TSMimeHdrFieldNextDup(http_ctx->server_request_bufp, http_ctx->server_request_hdrp, field_loc);
      if (first) {
        first = 0;
        TSMimeHdrFieldValueStringSet(http_ctx->server_request_bufp, http_ctx->server_request_hdrp, field_loc, -1, val, val_len);
      } else {
        TSMimeHdrFieldDestroy(http_ctx->server_request_bufp, http_ctx->server_request_hdrp, field_loc);
      }
      TSHandleMLocRelease(http_ctx->server_request_bufp, http_ctx->server_request_hdrp, field_loc);
      field_loc = tmp;
    }
  } else if (TSMimeHdrFieldCreateNamed(http_ctx->server_request_bufp, http_ctx->server_request_hdrp, key, key_len, &field_loc) !=
             TS_SUCCESS) {
    TSError("[ts_lua][%s] TSMimeHdrFieldCreateNamed error", __FUNCTION__);
    return 0;

  } else {
    TSMimeHdrFieldValueStringSet(http_ctx->server_request_bufp, http_ctx->server_request_hdrp, field_loc, -1, val, val_len);
    TSMimeHdrFieldAppend(http_ctx->server_request_bufp, http_ctx->server_request_hdrp, field_loc);
  }

  if (field_loc != TS_NULL_MLOC) {
    TSHandleMLocRelease(http_ctx->server_request_bufp, http_ctx->server_request_hdrp, field_loc);
  }

  return 0;
}

static void
ts_lua_inject_server_request_header_table_api(lua_State *L)
{
  lua_newtable(L); /* .header */

  lua_createtable(L, 0, 2); /* metatable for .header */

  lua_pushcfunction(L, ts_lua_server_request_header_table_get);
  lua_setfield(L, -2, "__index");
  lua_pushcfunction(L, ts_lua_server_request_header_table_set);
  lua_setfield(L, -2, "__newindex");

  lua_setmetatable(L, -2);

  lua_setfield(L, -2, "header_table");
}

static int
ts_lua_server_request_header_table_get(lua_State *L)
{
  const char *key;
  const char *val;
  int         val_len;
  size_t      key_len;
  int         count;

  TSMLoc           field_loc, next_field_loc;
  ts_lua_http_ctx *http_ctx;

  GET_HTTP_CONTEXT(http_ctx, L);

  /*  we skip the first argument that is the table */
  key = luaL_checklstring(L, 2, &key_len);

  if (!http_ctx->server_request_hdrp) {
    if (TSHttpTxnServerReqGet(http_ctx->txnp, &http_ctx->server_request_bufp, &http_ctx->server_request_hdrp) != TS_SUCCESS) {
      lua_pushnil(L);
      return 1;
    }
  }

  if (key && key_len) {
    field_loc = TSMimeHdrFieldFind(http_ctx->server_request_bufp, http_ctx->server_request_hdrp, key, key_len);

    if (field_loc != TS_NULL_MLOC) {
      lua_newtable(L);
      count = 0;
      while (field_loc != TS_NULL_MLOC) {
        val = TSMimeHdrFieldValueStringGet(http_ctx->server_request_bufp, http_ctx->server_request_hdrp, field_loc, -1, &val_len);
        next_field_loc = TSMimeHdrFieldNextDup(http_ctx->server_request_bufp, http_ctx->server_request_hdrp, field_loc);
        count++;

        lua_pushlstring(L, val, val_len);
        lua_rawseti(L, -2, count);

        TSHandleMLocRelease(http_ctx->server_request_bufp, http_ctx->server_request_hdrp, field_loc);
        field_loc = next_field_loc;
      }

    } else {
      lua_pushnil(L);
    }

  } else {
    lua_pushnil(L);
  }

  return 1;
}

static int
ts_lua_server_request_header_table_set(lua_State * /* L ATS_UNUSED */)
{
  return 0;
}

static void
ts_lua_inject_server_request_headers_api(lua_State *L)
{
  lua_pushcfunction(L, ts_lua_server_request_get_headers);
  lua_setfield(L, -2, "get_headers");
}

static int
ts_lua_server_request_get_headers(lua_State *L)
{
  const char *name;
  const char *value;
  int         name_len;
  int         value_len;
  TSMLoc      field_loc;
  TSMLoc      next_field_loc;
  const char *tvalue;
  size_t      tvalue_len;

  ts_lua_http_ctx *http_ctx;

  GET_HTTP_CONTEXT(http_ctx, L);

  TS_LUA_CHECK_SERVER_REQUEST_HDR(http_ctx);

  lua_newtable(L);

  field_loc = TSMimeHdrFieldGet(http_ctx->server_request_bufp, http_ctx->server_request_hdrp, 0);

  while (field_loc != TS_NULL_MLOC) {
    name = TSMimeHdrFieldNameGet(http_ctx->server_request_bufp, http_ctx->server_request_hdrp, field_loc, &name_len);
    if (name && name_len) {
      // retrieve the header name from table
      lua_pushlstring(L, name, name_len);
      lua_gettable(L, -2);
      if (lua_isnil(L, -1)) {
        // if header name does not exist in the table, insert it
        lua_pop(L, 1);
        value =
          TSMimeHdrFieldValueStringGet(http_ctx->server_request_bufp, http_ctx->server_request_hdrp, field_loc, -1, &value_len);
        lua_pushlstring(L, name, name_len);
        lua_pushlstring(L, value, value_len);
        lua_rawset(L, -3);
      } else {
        // if header name exists in the table, append a command and the new value to the end of the existing value
        tvalue = lua_tolstring(L, -1, &tvalue_len);
        lua_pop(L, 1);
        value =
          TSMimeHdrFieldValueStringGet(http_ctx->server_request_bufp, http_ctx->server_request_hdrp, field_loc, -1, &value_len);
        lua_pushlstring(L, name, name_len);
        lua_pushlstring(L, tvalue, tvalue_len);
        lua_pushlstring(L, ",", 1);
        lua_pushlstring(L, value, value_len);
        lua_concat(L, 3);
        lua_rawset(L, -3);
      }
    }

    next_field_loc = TSMimeHdrFieldNext(http_ctx->server_request_bufp, http_ctx->server_request_hdrp, field_loc);
    TSHandleMLocRelease(http_ctx->server_request_bufp, http_ctx->server_request_hdrp, field_loc);
    field_loc = next_field_loc;
  }

  return 1;
}

static void
ts_lua_inject_server_request_get_header_size_api(lua_State *L)
{
  lua_pushcfunction(L, ts_lua_server_request_get_header_size);
  lua_setfield(L, -2, "get_header_size");
}

static int
ts_lua_server_request_get_header_size(lua_State *L)
{
  int              header_size;
  ts_lua_http_ctx *http_ctx;

  GET_HTTP_CONTEXT(http_ctx, L);

  header_size = TSHttpTxnServerReqHdrBytesGet(http_ctx->txnp);
  lua_pushnumber(L, header_size);

  return 1;
}

static void
ts_lua_inject_server_request_get_body_size_api(lua_State *L)
{
  lua_pushcfunction(L, ts_lua_server_request_get_body_size);
  lua_setfield(L, -2, "get_body_size");
}

static int
ts_lua_server_request_get_body_size(lua_State *L)
{
  int64_t          body_size;
  ts_lua_http_ctx *http_ctx;

  GET_HTTP_CONTEXT(http_ctx, L);

  body_size = TSHttpTxnServerReqBodyBytesGet(http_ctx->txnp);
  lua_pushnumber(L, body_size);

  return 1;
}

static void
ts_lua_inject_server_request_uri_api(lua_State *L)
{
  lua_pushcfunction(L, ts_lua_server_request_set_uri);
  lua_setfield(L, -2, "set_uri");

  lua_pushcfunction(L, ts_lua_server_request_get_uri);
  lua_setfield(L, -2, "get_uri");
}

static int
ts_lua_server_request_get_uri(lua_State *L)
{
  const char *path;
  int         path_len;

  ts_lua_http_ctx *http_ctx;

  GET_HTTP_CONTEXT(http_ctx, L);

  TS_LUA_CHECK_SERVER_REQUEST_URL(http_ctx);

  path = TSUrlPathGet(http_ctx->server_request_bufp, http_ctx->server_request_url, &path_len);

  lua_pushlstring(L, "/", 1);
  lua_pushlstring(L, path, path_len >= TS_LUA_MAX_URL_LENGTH - 1 ? TS_LUA_MAX_URL_LENGTH - 2 : path_len);
  lua_concat(L, 2);

  return 1;
}

static int
ts_lua_server_request_set_uri(lua_State *L)
{
  const char *path;
  size_t      path_len;

  ts_lua_http_ctx *http_ctx;

  GET_HTTP_CONTEXT(http_ctx, L);

  TS_LUA_CHECK_SERVER_REQUEST_URL(http_ctx);

  path = luaL_checklstring(L, 1, &path_len);

  if (*path == '/') {
    path++;
    path_len--;
  }

  TSUrlPathSet(http_ctx->server_request_bufp, http_ctx->server_request_url, path, path_len);

  return 0;
}

static void
ts_lua_inject_server_request_uri_args_api(lua_State *L)
{
  lua_pushcfunction(L, ts_lua_server_request_set_uri_args);
  lua_setfield(L, -2, "set_uri_args");

  lua_pushcfunction(L, ts_lua_server_request_get_uri_args);
  lua_setfield(L, -2, "get_uri_args");
}

static int
ts_lua_server_request_set_uri_args(lua_State *L)
{
  const char *param;
  size_t      param_len;

  ts_lua_http_ctx *http_ctx;

  GET_HTTP_CONTEXT(http_ctx, L);

  TS_LUA_CHECK_SERVER_REQUEST_URL(http_ctx);

  param = luaL_checklstring(L, 1, &param_len);
  TSUrlHttpQuerySet(http_ctx->server_request_bufp, http_ctx->server_request_url, param, param_len);

  return 0;
}

static int
ts_lua_server_request_get_uri_args(lua_State *L)
{
  const char *param;
  int         param_len;

  ts_lua_http_ctx *http_ctx;

  GET_HTTP_CONTEXT(http_ctx, L);

  TS_LUA_CHECK_SERVER_REQUEST_URL(http_ctx);

  param = TSUrlHttpQueryGet(http_ctx->server_request_bufp, http_ctx->server_request_url, &param_len);

  if (param && param_len > 0) {
    lua_pushlstring(L, param, param_len);

  } else {
    lua_pushnil(L);
  }

  return 1;
}

static void
ts_lua_inject_server_request_url_api(lua_State *L)
{
  lua_pushcfunction(L, ts_lua_server_request_get_url_host);
  lua_setfield(L, -2, "get_url_host");
  lua_pushcfunction(L, ts_lua_server_request_set_url_host);
  lua_setfield(L, -2, "set_url_host");

  lua_pushcfunction(L, ts_lua_server_request_get_url_scheme);
  lua_setfield(L, -2, "get_url_scheme");
  lua_pushcfunction(L, ts_lua_server_request_set_url_scheme);
  lua_setfield(L, -2, "set_url_scheme");

  lua_pushcfunction(L, ts_lua_server_request_get_version);
  lua_setfield(L, -2, "get_version");
  lua_pushcfunction(L, ts_lua_server_request_set_version);
  lua_setfield(L, -2, "set_version");
}

static int
ts_lua_server_request_get_url_host(lua_State *L)
{
  const char *host;
  int         len = 0;

  ts_lua_http_ctx *http_ctx;

  GET_HTTP_CONTEXT(http_ctx, L);

  TS_LUA_CHECK_SERVER_REQUEST_URL(http_ctx);

  host = TSUrlHostGet(http_ctx->server_request_bufp, http_ctx->server_request_url, &len);

  if (len == 0) {
    char const *key     = "Host";
    char const *l_key   = "host";
    int         key_len = 4;

    TSMLoc field_loc;

    field_loc = TSMimeHdrFieldFind(http_ctx->server_request_bufp, http_ctx->server_request_hdrp, key, key_len);
    if (field_loc) {
      host = TSMimeHdrFieldValueStringGet(http_ctx->server_request_bufp, http_ctx->server_request_hdrp, field_loc, -1, &len);
      TSHandleMLocRelease(http_ctx->server_request_bufp, http_ctx->server_request_hdrp, field_loc);

    } else {
      field_loc = TSMimeHdrFieldFind(http_ctx->server_request_bufp, http_ctx->server_request_hdrp, l_key, key_len);
      if (field_loc) {
        host = TSMimeHdrFieldValueStringGet(http_ctx->server_request_bufp, http_ctx->server_request_hdrp, field_loc, -1, &len);
        TSHandleMLocRelease(http_ctx->server_request_bufp, http_ctx->server_request_hdrp, field_loc);
      }
    }
  }

  lua_pushlstring(L, host, len);

  return 1;
}

static int
ts_lua_server_request_set_url_host(lua_State *L)
{
  const char *host;
  size_t      len;

  ts_lua_http_ctx *http_ctx;

  GET_HTTP_CONTEXT(http_ctx, L);
  TS_LUA_CHECK_SERVER_REQUEST_URL(http_ctx);

  host = luaL_checklstring(L, 1, &len);

  TSUrlHostSet(http_ctx->server_request_bufp, http_ctx->server_request_url, host, len);

  return 0;
}

static int
ts_lua_server_request_get_url_scheme(lua_State *L)
{
  const char *scheme;
  int         len;

  ts_lua_http_ctx *http_ctx;

  GET_HTTP_CONTEXT(http_ctx, L);
  TS_LUA_CHECK_SERVER_REQUEST_URL(http_ctx);

  scheme = TSUrlSchemeGet(http_ctx->server_request_bufp, http_ctx->server_request_url, &len);

  lua_pushlstring(L, scheme, len);

  return 1;
}

static int
ts_lua_server_request_set_url_scheme(lua_State *L)
{
  const char *scheme;
  size_t      len;

  ts_lua_http_ctx *http_ctx;

  GET_HTTP_CONTEXT(http_ctx, L);
  TS_LUA_CHECK_SERVER_REQUEST_URL(http_ctx);

  scheme = luaL_checklstring(L, 1, &len);

  TSUrlSchemeSet(http_ctx->server_request_bufp, http_ctx->server_request_url, scheme, len);

  return 0;
}

static int
ts_lua_server_request_get_version(lua_State *L)
{
  int  version;
  char buf[32];
  int  n;

  ts_lua_http_ctx *http_ctx;

  GET_HTTP_CONTEXT(http_ctx, L);
  TS_LUA_CHECK_SERVER_REQUEST_HDR(http_ctx);

  version = TSHttpHdrVersionGet(http_ctx->server_request_bufp, http_ctx->server_request_hdrp);

  n = snprintf(buf, sizeof(buf), "%d.%d", TS_HTTP_MAJOR(version), TS_HTTP_MINOR(version));

  if (n >= (int)sizeof(buf)) {
    lua_pushlstring(L, buf, sizeof(buf) - 1);
  } else if (n > 0) {
    lua_pushlstring(L, buf, n);
  }

  return 1;
}

static int
ts_lua_server_request_set_version(lua_State *L)
{
  const char  *version;
  size_t       len;
  unsigned int major, minor;

  ts_lua_http_ctx *http_ctx;

  GET_HTTP_CONTEXT(http_ctx, L);

  TS_LUA_CHECK_SERVER_REQUEST_HDR(http_ctx);

  version = luaL_checklstring(L, 1, &len);

  if (sscanf(version, "%2u.%2u", &major, &minor) != 2) {
    return luaL_error(L, "failed to set version. Format must be X.Y");
  }

  TSHttpHdrVersionSet(http_ctx->server_request_bufp, http_ctx->server_request_hdrp, TS_HTTP_VERSION(major, minor));

  return 0;
}

static int
ts_lua_server_request_server_addr_get_ip(lua_State *L)
{
  struct sockaddr const *server_ip;
  char                   sip[128] = "";
  ts_lua_http_ctx       *http_ctx;

  GET_HTTP_CONTEXT(http_ctx, L);

  server_ip = TSHttpTxnServerAddrGet(http_ctx->txnp);

  if (server_ip == nullptr) {
    lua_pushnil(L);

  } else {
    if (server_ip->sa_family == AF_INET) {
      inet_ntop(AF_INET, (const void *)&((struct sockaddr_in *)server_ip)->sin_addr, sip, sizeof(sip));
    } else if (server_ip->sa_family == AF_INET6) {
      inet_ntop(AF_INET6, (const void *)&((struct sockaddr_in6 *)server_ip)->sin6_addr, sip, sizeof(sip));
    }

    if (sip[0] == '\0') {
      lua_pushnil(L);
    } else {
      lua_pushstring(L, sip);
    }
  }

  return 1;
}

static int
ts_lua_server_request_server_addr_get_port(lua_State *L)
{
  struct sockaddr const *server_ip;
  ts_lua_http_ctx       *http_ctx;
  int                    port = 0;

  GET_HTTP_CONTEXT(http_ctx, L);

  server_ip = TSHttpTxnServerAddrGet(http_ctx->txnp);

  if (server_ip == nullptr) {
    lua_pushnil(L);

  } else {
    if (server_ip->sa_family == AF_INET) {
      port = ((struct sockaddr_in *)server_ip)->sin_port;
    } else if (server_ip->sa_family == AF_INET6) {
      port = ((struct sockaddr_in6 *)server_ip)->sin6_port;
    }

    lua_pushnumber(L, ntohs(port));
  }

  return 1;
}

static int
ts_lua_server_request_server_addr_get_outgoing_port(lua_State *L)
{
  struct sockaddr const *outgoing_addr;
  ts_lua_http_ctx       *http_ctx;
  int                    port = 0;

  GET_HTTP_CONTEXT(http_ctx, L);

  outgoing_addr = TSHttpTxnOutgoingAddrGet(http_ctx->txnp);

  if (outgoing_addr == nullptr) {
    lua_pushnil(L);

  } else {
    if (outgoing_addr->sa_family == AF_INET) {
      port = ((struct sockaddr_in *)outgoing_addr)->sin_port;
    } else if (outgoing_addr->sa_family == AF_INET6) {
      port = ((struct sockaddr_in6 *)outgoing_addr)->sin6_port;
    }

    lua_pushnumber(L, ntohs(port));
  }

  return 1;
}

static int
ts_lua_server_request_server_addr_get_addr(lua_State *L)
{
  struct sockaddr const *server_ip;
  ts_lua_http_ctx       *http_ctx;
  int                    port     = 0;
  int                    family   = AF_UNSPEC;
  char                   sip[128] = "";

  GET_HTTP_CONTEXT(http_ctx, L);

  server_ip = TSHttpTxnServerAddrGet(http_ctx->txnp);

  if (server_ip == nullptr) {
    lua_pushnil(L);
    lua_pushnil(L);
    lua_pushnil(L);

  } else {
    if (server_ip->sa_family == AF_INET) {
      port = ntohs(((struct sockaddr_in *)server_ip)->sin_port);
      inet_ntop(AF_INET, (const void *)&((struct sockaddr_in *)server_ip)->sin_addr, sip, sizeof(sip));
      family = AF_INET;
    } else if (server_ip->sa_family == AF_INET6) {
      port = ntohs(((struct sockaddr_in6 *)server_ip)->sin6_port);
      inet_ntop(AF_INET6, (const void *)&((struct sockaddr_in6 *)server_ip)->sin6_addr, sip, sizeof(sip));
      family = AF_INET6;
    } else if (server_ip->sa_family == AF_UNIX) {
      family = AF_UNIX;
    }

    lua_pushstring(L, sip);
    lua_pushnumber(L, port);
    lua_pushnumber(L, family);
  }

  return 3;
}

static int
ts_lua_server_request_server_addr_get_nexthop_addr(lua_State *L)
{
  struct sockaddr const *server_ip;
  ts_lua_http_ctx       *http_ctx;
  int                    port     = 0;
  int                    family   = AF_UNSPEC;
  char                   sip[128] = "";

  GET_HTTP_CONTEXT(http_ctx, L);

  server_ip = TSHttpTxnNextHopAddrGet(http_ctx->txnp);

  if (server_ip == nullptr) {
    lua_pushnil(L);
    lua_pushnil(L);
    lua_pushnil(L);

  } else {
    if (server_ip->sa_family == AF_INET) {
      port = ntohs(((struct sockaddr_in *)server_ip)->sin_port);
      inet_ntop(AF_INET, (const void *)&((struct sockaddr_in *)server_ip)->sin_addr, sip, sizeof(sip));
      family = AF_INET;
    } else if (server_ip->sa_family == AF_INET6) {
      port = ntohs(((struct sockaddr_in6 *)server_ip)->sin6_port);
      inet_ntop(AF_INET6, (const void *)&((struct sockaddr_in6 *)server_ip)->sin6_addr, sip, sizeof(sip));
      family = AF_INET6;
    } else if (server_ip->sa_family == AF_UNIX) {
      family = AF_UNIX;
    }

    lua_pushstring(L, sip);
    lua_pushnumber(L, port);
    lua_pushnumber(L, family);
  }

  return 3;
}

static int
ts_lua_server_request_server_addr_get_nexthop_name(lua_State *L)
{
  ts_lua_http_ctx *http_ctx;
  const char      *name;

  GET_HTTP_CONTEXT(http_ctx, L);

  name = TSHttpTxnNextHopNameGet(http_ctx->txnp);

  if (name == nullptr) {
    lua_pushnil(L);
  } else {
    lua_pushstring(L, name);
  }

  return 1;
}

static int
ts_lua_server_request_server_addr_get_nexthop_port(lua_State *L)
{
  ts_lua_http_ctx *http_ctx;

  GET_HTTP_CONTEXT(http_ctx, L);
  const int port = TSHttpTxnNextHopPortGet(http_ctx->txnp);
  lua_pushnumber(L, port);

  return 1;
}

static int
ts_lua_server_request_server_addr_set_addr(lua_State *L)
{
  union {
    struct sockaddr_in  sin4;
    struct sockaddr_in6 sin6;
    struct sockaddr     sa;
  } addr;
  ts_lua_http_ctx *http_ctx;
  int              n;
  int              port;
  int              family;
  const char      *sip;
  size_t           sip_len;

  GET_HTTP_CONTEXT(http_ctx, L);

  n = lua_gettop(L);

  if (n == 3) {
    sip    = luaL_checklstring(L, 1, &sip_len);
    port   = luaL_checknumber(L, 2);
    family = luaL_checknumber(L, 3);

    if (family == AF_INET) {
      addr.sin4.sin_family = AF_INET;
      addr.sin4.sin_port   = htons(port);
      if (!inet_pton(family, sip, &addr.sin4.sin_addr)) {
        return luaL_error(L, "invalid ipv4 address");
      }
    } else if (family == AF_INET6) {
      addr.sin6.sin6_family = AF_INET6;
      addr.sin6.sin6_port   = htons(port);
      if (!inet_pton(family, sip, &addr.sin6.sin6_addr)) {
        return luaL_error(L, "invalid ipv6 address");
      }
    } else {
      return luaL_error(L, "invalid address family");
    }

    TSHttpTxnServerAddrSet(http_ctx->txnp, &addr.sa);
  } else {
    return luaL_error(L, "incorrect # of arguments to ts.server_request.addr.set_addr, receiving %d instead of 3", n);
  }

  return 0;
}

static int
ts_lua_server_request_server_addr_set_outgoing_addr(lua_State *L)
{
  union {
    struct sockaddr_in  sin4;
    struct sockaddr_in6 sin6;
    struct sockaddr     sa;
  } addr;
  ts_lua_http_ctx *http_ctx;
  int              n;
  int              port;
  int              family;
  const char      *sip;
  size_t           sip_len;

  GET_HTTP_CONTEXT(http_ctx, L);

  n = lua_gettop(L);

  if (n == 3) {
    sip    = luaL_checklstring(L, 1, &sip_len);
    port   = luaL_checknumber(L, 2);
    family = luaL_checknumber(L, 3);

    if (family == AF_INET) {
      addr.sin4.sin_family = AF_INET;
      addr.sin4.sin_port   = htons(port);
      if (!inet_pton(family, sip, &addr.sin4.sin_addr)) {
        return luaL_error(L, "invalid ipv4 address");
      }
    } else if (family == AF_INET6) {
      addr.sin6.sin6_family = AF_INET6;
      addr.sin6.sin6_port   = htons(port);
      if (!inet_pton(family, sip, &addr.sin6.sin6_addr)) {
        return luaL_error(L, "invalid ipv6 address");
      }
    } else {
      return luaL_error(L, "invalid address family");
    }

    TSHttpTxnOutgoingAddrSet(http_ctx->txnp, &addr.sa);
  } else {
    return luaL_error(L, "incorrect # of arguments to ts.server_request.addr.set_outgoing_addr, receiving %d instead of 3", n);
  }

  return 0;
}

static void
ts_lua_inject_server_request_method_api(lua_State *L)
{
  lua_pushcfunction(L, ts_lua_server_request_get_method);
  lua_setfield(L, -2, "get_method");

  lua_pushcfunction(L, ts_lua_server_request_set_method);
  lua_setfield(L, -2, "set_method");
}

static int
ts_lua_server_request_get_method(lua_State *L)
{
  const char *method;
  int         method_len;

  ts_lua_http_ctx *http_ctx;

  GET_HTTP_CONTEXT(http_ctx, L);

  TS_LUA_CHECK_SERVER_REQUEST_HDR(http_ctx);

  method = TSHttpHdrMethodGet(http_ctx->server_request_bufp, http_ctx->server_request_hdrp, &method_len);

  if (method && method_len) {
    lua_pushlstring(L, method, method_len);
  } else {
    lua_pushnil(L);
  }

  return 1;
}

static int
ts_lua_server_request_set_method(lua_State *L)
{
  const char *method;
  size_t      method_len;

  ts_lua_http_ctx *http_ctx;

  GET_HTTP_CONTEXT(http_ctx, L);

  TS_LUA_CHECK_SERVER_REQUEST_HDR(http_ctx);

  method = luaL_checklstring(L, 1, &method_len);

  if (method) {
    TSHttpHdrMethodSet(http_ctx->server_request_bufp, http_ctx->server_request_hdrp, method, method_len);
  }

  return 0;
}