#ifndef SRC_NODE_HTTP_COMMON_H_

#define SRC_NODE_HTTP_COMMON_H_

#if defined(NODE_WANT_INTERNALS) && NODE_WANT_INTERNALS

#include "v8.h"

#include "node_mem.h"

#include <string>

namespace node {

class Environment;

#define MAX_MAX_HEADER_LIST_SIZE 16777215u

#define DEFAULT_MAX_HEADER_LIST_PAIRS 128u

#define DEFAULT_MAX_HEADER_LENGTH 8192

#define HTTP_SPECIAL_HEADERS(V)                                               \

  V(STATUS, ":status")                                                        \

  V(METHOD, ":method")                                                        \

  V(AUTHORITY, ":authority")                                                  \

  V(SCHEME, ":scheme")                                                        \

  V(PATH, ":path")                                                            \

  V(PROTOCOL, ":protocol")

#define HTTP_REGULAR_HEADERS(V)                                                \

  V(ACCEPT_ENCODING, "accept-encoding")                                        \

  V(ACCEPT_LANGUAGE, "accept-language")                                        \

  V(ACCEPT_RANGES, "accept-ranges")                                            \

  V(ACCEPT, "accept")                                                          \

  V(ACCESS_CONTROL_ALLOW_CREDENTIALS, "access-control-allow-credentials")      \

  V(ACCESS_CONTROL_ALLOW_HEADERS, "access-control-allow-headers")              \

  V(ACCESS_CONTROL_ALLOW_METHODS, "access-control-allow-methods")              \

  V(ACCESS_CONTROL_ALLOW_ORIGIN, "access-control-allow-origin")                \

  V(ACCESS_CONTROL_EXPOSE_HEADERS, "access-control-expose-headers")            \

  V(ACCESS_CONTROL_REQUEST_HEADERS, "access-control-request-headers")          \

  V(ACCESS_CONTROL_REQUEST_METHOD, "access-control-request-method")            \

  V(AGE, "age")                                                                \

  V(AUTHORIZATION, "authorization")                                            \

  V(CACHE_CONTROL, "cache-control")                                            \

  V(CONNECTION, "connection")                                                  \

  V(CONTENT_DISPOSITION, "content-disposition")                                \

  V(CONTENT_ENCODING, "content-encoding")                                      \

  V(CONTENT_LENGTH, "content-length")                                          \

  V(CONTENT_TYPE, "content-type")                                              \

  V(COOKIE, "cookie")                                                          \

  V(DATE, "date")                                                              \

  V(ETAG, "etag")                                                              \

  V(FORWARDED, "forwarded")                                                    \

  V(HOST, "host")                                                              \

  V(IF_MODIFIED_SINCE, "if-modified-since")                                    \

  V(IF_NONE_MATCH, "if-none-match")                                            \

  V(IF_RANGE, "if-range")                                                      \

  V(LAST_MODIFIED, "last-modified")                                            \

  V(LINK, "link")                                                              \

  V(LOCATION, "location")                                                      \

  V(RANGE, "range")                                                            \

  V(REFERER, "referer")                                                        \

  V(SERVER, "server")                                                          \

  V(SET_COOKIE, "set-cookie")                                                  \

  V(STRICT_TRANSPORT_SECURITY, "strict-transport-security")                    \

  V(TRANSFER_ENCODING, "transfer-encoding")                                    \

  V(TE, "te")                                                                  \

  V(UPGRADE_INSECURE_REQUESTS, "upgrade-insecure-requests")                    \

  V(UPGRADE, "upgrade")                                                        \

  V(USER_AGENT, "user-agent")                                                  \

  V(VARY, "vary")                                                              \

  V(X_CONTENT_TYPE_OPTIONS, "x-content-type-options")                          \

  V(X_FRAME_OPTIONS, "x-frame-options")                                        \

  V(KEEP_ALIVE, "keep-alive")                                                  \

  V(PROXY_CONNECTION, "proxy-connection")                                      \

  V(X_XSS_PROTECTION, "x-xss-protection")                                      \

  V(ALT_SVC, "alt-svc")                                                        \

  V(CONTENT_SECURITY_POLICY, "content-security-policy")                        \

  V(EARLY_DATA, "early-data")                                                  \

  V(EXPECT_CT, "expect-ct")                                                    \

  V(ORIGIN, "origin")                                                          \

  V(PURPOSE, "purpose")                                                        \

  V(TIMING_ALLOW_ORIGIN, "timing-allow-origin")                                \

  V(X_FORWARDED_FOR, "x-forwarded-for")                                        \

  V(PRIORITY, "priority")

#define HTTP_ADDITIONAL_HEADERS(V)                                            \

  V(ACCEPT_CHARSET, "accept-charset")                                         \

  V(ACCESS_CONTROL_MAX_AGE, "access-control-max-age")                         \

  V(ALLOW, "allow")                                                           \

  V(CONTENT_LANGUAGE, "content-language")                                     \

  V(CONTENT_LOCATION, "content-location")                                     \

  V(CONTENT_MD5, "content-md5")                                               \

  V(CONTENT_RANGE, "content-range")                                           \

  V(DNT, "dnt")                                                               \

  V(EXPECT, "expect")                                                         \

  V(EXPIRES, "expires")                                                       \

  V(FROM, "from")                                                             \

  V(IF_MATCH, "if-match")                                                     \

  V(IF_UNMODIFIED_SINCE, "if-unmodified-since")                               \

  V(MAX_FORWARDS, "max-forwards")                                             \

  V(PREFER, "prefer")                                                         \

  V(PROXY_AUTHENTICATE, "proxy-authenticate")                                 \

  V(PROXY_AUTHORIZATION, "proxy-authorization")                               \

  V(REFRESH, "refresh")                                                       \

  V(RETRY_AFTER, "retry-after")                                               \

  V(TRAILER, "trailer")                                                       \

  V(TK, "tk")                                                                 \

  V(VIA, "via")                                                               \

  V(WARNING, "warning")                                                       \

  V(WWW_AUTHENTICATE, "www-authenticate")                                     \

  V(HTTP2_SETTINGS, "http2-settings")

// Special and regular headers are handled specifically by the HTTP/2 (and

// later HTTP/3) implementation.

#define HTTP_KNOWN_HEADERS(V)                                                 \

  HTTP_SPECIAL_HEADERS(V)                                                     \

  HTTP_REGULAR_HEADERS(V)                                                     \

  HTTP_ADDITIONAL_HEADERS(V)

enum http_known_headers {

  HTTP_KNOWN_HEADER_MIN,

#define V(name, value) HTTP_HEADER_##name,

  HTTP_KNOWN_HEADERS(V)

#undef V

  HTTP_KNOWN_HEADER_MAX

};

#define HTTP_STATUS_CODES(V)                                                  \

  V(CONTINUE, 100)                                                            \

  V(SWITCHING_PROTOCOLS, 101)                                                 \

  V(PROCESSING, 102)                                                          \

  V(EARLY_HINTS, 103)                                                         \

  V(OK, 200)                                                                  \

  V(CREATED, 201)                                                             \

  V(ACCEPTED, 202)                                                            \

  V(NON_AUTHORITATIVE_INFORMATION, 203)                                       \

  V(NO_CONTENT, 204)                                                          \

  V(RESET_CONTENT, 205)                                                       \

  V(PARTIAL_CONTENT, 206)                                                     \

  V(MULTI_STATUS, 207)                                                        \

  V(ALREADY_REPORTED, 208)                                                    \

  V(IM_USED, 226)                                                             \

  V(MULTIPLE_CHOICES, 300)                                                    \

  V(MOVED_PERMANENTLY, 301)                                                   \

  V(FOUND, 302)                                                               \

  V(SEE_OTHER, 303)                                                           \

  V(NOT_MODIFIED, 304)                                                        \

  V(USE_PROXY, 305)                                                           \

  V(TEMPORARY_REDIRECT, 307)                                                  \

  V(PERMANENT_REDIRECT, 308)                                                  \

  V(BAD_REQUEST, 400)                                                         \

  V(UNAUTHORIZED, 401)                                                        \

  V(PAYMENT_REQUIRED, 402)                                                    \

  V(FORBIDDEN, 403)                                                           \

  V(NOT_FOUND, 404)                                                           \

  V(METHOD_NOT_ALLOWED, 405)                                                  \

  V(NOT_ACCEPTABLE, 406)                                                      \

  V(PROXY_AUTHENTICATION_REQUIRED, 407)                                       \

  V(REQUEST_TIMEOUT, 408)                                                     \

  V(CONFLICT, 409)                                                            \

  V(GONE, 410)                                                                \

  V(LENGTH_REQUIRED, 411)                                                     \

  V(PRECONDITION_FAILED, 412)                                                 \

  V(PAYLOAD_TOO_LARGE, 413)                                                   \

  V(URI_TOO_LONG, 414)                                                        \

  V(UNSUPPORTED_MEDIA_TYPE, 415)                                              \

  V(RANGE_NOT_SATISFIABLE, 416)                                               \

  V(EXPECTATION_FAILED, 417)                                                  \

  V(TEAPOT, 418)                                                              \

  V(MISDIRECTED_REQUEST, 421)                                                 \

  V(UNPROCESSABLE_ENTITY, 422)                                                \

  V(LOCKED, 423)                                                              \

  V(FAILED_DEPENDENCY, 424)                                                   \

  V(TOO_EARLY, 425)                                                           \

  V(UPGRADE_REQUIRED, 426)                                                    \

  V(PRECONDITION_REQUIRED, 428)                                               \

  V(TOO_MANY_REQUESTS, 429)                                                   \

  V(REQUEST_HEADER_FIELDS_TOO_LARGE, 431)                                     \

  V(UNAVAILABLE_FOR_LEGAL_REASONS, 451)                                       \

  V(INTERNAL_SERVER_ERROR, 500)                                               \

  V(NOT_IMPLEMENTED, 501)                                                     \

  V(BAD_GATEWAY, 502)                                                         \

  V(SERVICE_UNAVAILABLE, 503)                                                 \

  V(GATEWAY_TIMEOUT, 504)                                                     \

  V(HTTP_VERSION_NOT_SUPPORTED, 505)                                          \

  V(VARIANT_ALSO_NEGOTIATES, 506)                                             \

  V(INSUFFICIENT_STORAGE, 507)                                                \

  V(LOOP_DETECTED, 508)                                                       \

  V(BANDWIDTH_LIMIT_EXCEEDED, 509)                                            \

  V(NOT_EXTENDED, 510)                                                        \

  V(NETWORK_AUTHENTICATION_REQUIRED, 511)

enum http_status_codes {

#define V(name, code) HTTP_STATUS_##name = code,

  HTTP_STATUS_CODES(V)

#undef V

};

// Unlike the HTTP/1 implementation, the HTTP/2 implementation is not limited

// to a fixed number of known supported HTTP methods. These constants, therefore

// are provided strictly as a convenience to users and are exposed via the

// require('node:http2').constants object.

#define HTTP_KNOWN_METHODS(V)                                                 \

  V(ACL, "ACL")                                                               \

  V(BASELINE_CONTROL, "BASELINE-CONTROL")                                     \

  V(BIND, "BIND")                                                             \

  V(CHECKIN, "CHECKIN")                                                       \

  V(CHECKOUT, "CHECKOUT")                                                     \

  V(CONNECT, "CONNECT")                                                       \

  V(COPY, "COPY")                                                             \

  V(DELETE, "DELETE")                                                         \

  V(GET, "GET")                                                               \

  V(HEAD, "HEAD")                                                             \

  V(LABEL, "LABEL")                                                           \

  V(LINK, "LINK")                                                             \

  V(LOCK, "LOCK")                                                             \

  V(MERGE, "MERGE")                                                           \

  V(MKACTIVITY, "MKACTIVITY")                                                 \

  V(MKCALENDAR, "MKCALENDAR")                                                 \

  V(MKCOL, "MKCOL")                                                           \

  V(MKREDIRECTREF, "MKREDIRECTREF")                                           \

  V(MKWORKSPACE, "MKWORKSPACE")                                               \

  V(MOVE, "MOVE")                                                             \

  V(OPTIONS, "OPTIONS")                                                       \

  V(ORDERPATCH, "ORDERPATCH")                                                 \

  V(PATCH, "PATCH")                                                           \

  V(POST, "POST")                                                             \

  V(PRI, "PRI")                                                               \

  V(PROPFIND, "PROPFIND")                                                     \

  V(PROPPATCH, "PROPPATCH")                                                   \

  V(PUT, "PUT")                                                               \

  V(REBIND, "REBIND")                                                         \

  V(REPORT, "REPORT")                                                         \

  V(SEARCH, "SEARCH")                                                         \

  V(TRACE, "TRACE")                                                           \

  V(UNBIND, "UNBIND")                                                         \

  V(UNCHECKOUT, "UNCHECKOUT")                                                 \

  V(UNLINK, "UNLINK")                                                         \

  V(UNLOCK, "UNLOCK")                                                         \

  V(UPDATE, "UPDATE")                                                         \

  V(UPDATEREDIRECTREF, "UPDATEREDIRECTREF")                                   \

  V(VERSION_CONTROL, "VERSION-CONTROL")

// NgHeaders takes as input a block of headers provided by the

// JavaScript side (see http2's mapToHeaders function) and

// converts it into a array of ng header structs. This is done

// generically to handle both http/2 and (in the future) http/3,

// which use nearly identical structs. The template parameter

// takes a Traits type that defines the ng header struct and

// the kNoneFlag value. See Http2HeaderTraits in node_http2.h

// for an example.

template <typename T>

class NgHeaders {

 public:

  typedef typename T::nv_t nv_t;

  inline NgHeaders(Environment* env, v8::Local<v8::Array> headers);

  const nv_t* operator*() const {

    return reinterpret_cast<const nv_t*>(*buf_);

  }

  }

  }

 private:

  size_t count_;

  MaybeStackBuffer<char, 3000> buf_;

};

// The ng libraries use nearly identical

// reference counted structures for retaining header name and value

// information in memory until the application is done with it.

// The NgRcBufPointer is an intelligent pointer capable of working

// with either type, handling the ref counting increment and

// decrement as appropriate. The Template takes a single Traits

// type that provides the rc buffer and vec type, as well as

// implementations for multiple static functions.

// See Http2RcBufferPointerTraits in node_http2.h for an example.

template <typename T>

class NgRcBufPointer : public MemoryRetainer {

 public:

  typedef typename T::rcbuf_t rcbuf_t;

  typedef typename T::vector_t vector_t;

  explicit NgRcBufPointer(rcbuf_t* buf) {

    reset(buf);

  }

  template <typename B>

  NgRcBufPointer(const NgRcBufPointer<B>& other) {

    reset(other.get());

  }

  template <typename B>

  NgRcBufPointer& operator=(const NgRcBufPointer<B>& other) {

    if (other.get() == get()) return *this;

    this->~NgRcBufPointer();

    return *new (this) NgRcBufPointer(other);

  }

  NgRcBufPointer& operator=(const NgRcBufPointer& other) {

    if (other.get() == get()) return *this;

    this->~NgRcBufPointer();

    return *new (this) NgRcBufPointer(other);

  }

  NgRcBufPointer& operator=(NgRcBufPointer&& other) {

    this->~NgRcBufPointer();

    return *new (this) NgRcBufPointer(std::move(other));

  }

  }

  // Returns the underlying ngvec for this rcbuf

  }

  }

  }

    }

  }

  rcbuf_t& operator*() const { return *get(); }

  rcbuf_t* operator->() const { return buf_; }

  operator bool() const { return buf_ != nullptr; }

  void SetInternalizable() { internalizable_ = true; }

  }

  }

  class External : public v8::String::ExternalOneByteStringResource {

   public:

    }

    }

    static inline

        Environment* env,

        const NgRcBufPointer<T>& ptr) {

          env->isolate(),

          ptr.data(),

          v8::NewStringType::kInternalized,

    }

    template <typename Allocator>

        Allocator* allocator,

        NgRcBufPointer<T> ptr) {

        }

      }

      }

      }

      v8::MaybeLocal<v8::String> str =

    }

   private:

    NgRcBufPointer<T> ptr_;

  };

 private:

  rcbuf_t* buf_ = nullptr;

  bool internalizable_ = false;

};

template <typename allocator_t>

struct NgHeaderBase : public MemoryRetainer {

  virtual v8::MaybeLocal<v8::String> GetName(allocator_t* allocator) const = 0;

  virtual v8::MaybeLocal<v8::String> GetValue(allocator_t* allocator) const = 0;

  virtual std::string name() const = 0;

  virtual std::string value() const = 0;

  virtual size_t length() const = 0;

  virtual uint8_t flags() const = 0;

  virtual std::string ToString() const;

};

// The ng libraries use nearly identical structs to represent

// received http headers. The NgHeader class wraps those in a

// consistent way and allows converting the name and value to

// v8 strings. The template is given a Traits type that provides

// the NgRcBufPointer type, the NgLibMemoryManager to use for

// memory tracking, and implementation of static utility functions.

// See Http2HeaderTraits in node_http2.h for an example.

template <typename T>

class NgHeader final : public NgHeaderBase<typename T::allocator_t> {

 public:

  typedef typename T::rcbufferpointer_t rcbufferpointer_t;

  typedef typename T::rcbufferpointer_t::rcbuf_t rcbuf_t;

  typedef typename T::allocator_t allocator_t;

  inline static bool IsZeroLength(rcbuf_t* name, rcbuf_t* value);

  inline static bool IsZeroLength(int32_t token, rcbuf_t* name, rcbuf_t* value);

  inline NgHeader(

      Environment* env,

      rcbuf_t* name,

      rcbuf_t* value,

      uint8_t flags);

  inline NgHeader(

      Environment* env,

      int32_t token,

      rcbuf_t* name,

      rcbuf_t* value,

      uint8_t flags);

  inline NgHeader(NgHeader<T>&& other) noexcept;

  // Calling GetName and GetValue will have the effect of releasing

  // control over the reference counted buffer from this NgHeader

  // object to the v8 string. Once the v8 string is garbage collected,

  // the reference counter will be decremented.

  inline v8::MaybeLocal<v8::String> GetName(

      allocator_t* allocator) const override;

  inline v8::MaybeLocal<v8::String> GetValue(

      allocator_t* allocator) const override;

  inline std::string name() const override;

  inline std::string value() const override;

  inline size_t length() const override;

  inline uint8_t flags() const override;

  void MemoryInfo(MemoryTracker* tracker) const override;

 private:

  Environment* env_;

  rcbufferpointer_t name_;

  rcbufferpointer_t value_;

  int32_t token_ = -1;

  uint8_t flags_ = 0;

};

inline size_t GetServerMaxHeaderPairs(size_t max_header_pairs);

inline size_t GetClientMaxHeaderPairs(size_t max_header_pairs);

}  // namespace node

#endif  // defined(NODE_WANT_INTERNALS) && NODE_WANT_INTERNALS

#endif  // SRC_NODE_HTTP_COMMON_H_