
/*
 * Copyright (C) Igor Sysoev
 * Copyright (C) Nginx, Inc.
 */


#ifndef _NGX_HTTP_H_INCLUDED_
#define _NGX_HTTP_H_INCLUDED_


#include <ngx_config.h>
#include <ngx_core.h>


#define NGX_HTTP_10_ALPN_ADVERTISE  "\x08http/1.0"
#define NGX_HTTP_11_ALPN_ADVERTISE  "\x08http/1.1"
#define NGX_HTTP_NPN_ADVERTISE      NGX_HTTP_11_ALPN_ADVERTISE


typedef struct ngx_http_request_s     ngx_http_request_t;
typedef struct ngx_http_upstream_s    ngx_http_upstream_t;
typedef struct ngx_http_cache_s       ngx_http_cache_t;
typedef struct ngx_http_file_cache_s  ngx_http_file_cache_t;
typedef struct ngx_http_log_ctx_s     ngx_http_log_ctx_t;
typedef struct ngx_http_chunked_s     ngx_http_chunked_t;
typedef struct ngx_http_v2_stream_s   ngx_http_v2_stream_t;

typedef ngx_int_t (*ngx_http_header_handler_pt)(ngx_http_request_t *r,
    ngx_table_elt_t *h, ngx_uint_t offset);
typedef u_char *(*ngx_http_log_handler_pt)(ngx_http_request_t *r,
    ngx_http_request_t *sr, u_char *buf, size_t len);


#include <ngx_http_variables.h>
#include <ngx_http_config.h>
#include <ngx_http_request.h>
#include <ngx_http_script.h>
#include <ngx_http_upstream.h>
#include <ngx_http_upstream_round_robin.h>
#include <ngx_http_core_module.h>

#if (NGX_HTTP_V2)
#include <ngx_http_v2.h>
#endif
#if (NGX_HTTP_CACHE)
#include <ngx_http_cache.h>
#endif
#if (NGX_HTTP_SSL)
#include <ngx_http_ssl_module.h>
#endif


struct ngx_http_log_ctx_s {
    ngx_connection_t    *connection;
    ngx_http_request_t  *request;
    ngx_http_request_t  *current_request;
};


struct ngx_http_chunked_s {
    ngx_uint_t           state;
    off_t                size;
    off_t                length;
};


typedef struct {
    ngx_uint_t           http_version;
    ngx_uint_t           code;
    ngx_uint_t           count;
    u_char              *start;
    u_char              *end;
} ngx_http_status_t;


#define ngx_http_get_module_ctx(r, module)  (r)->ctx[module.ctx_index]
#define ngx_http_set_ctx(r, c, module)      r->ctx[module.ctx_index] = c;


ngx_int_t ngx_http_add_location(ngx_conf_t *cf, ngx_queue_t **locations,
    ngx_http_core_loc_conf_t *clcf);
ngx_int_t ngx_http_add_listen(ngx_conf_t *cf, ngx_http_core_srv_conf_t *cscf,
    ngx_http_listen_opt_t *lsopt);


void ngx_http_init_connection(ngx_connection_t *c);
void ngx_http_close_connection(ngx_connection_t *c);

#if (NGX_HTTP_SSL && defined SSL_CTRL_SET_TLSEXT_HOSTNAME)
#if defined(OPENSSL_IS_BORINGSSL)
enum ssl_select_cert_result_t ngx_http_ssl_client_hello(
    const SSL_CLIENT_HELLO *client_hello);
#elif defined(SSL_CLIENT_HELLO_CB)
int ngx_http_ssl_client_hello(ngx_ssl_conn_t *ssl_conn, int *ad, void *arg);
#endif
int ngx_http_ssl_servername(ngx_ssl_conn_t *ssl_conn, int *ad, void *arg);
#endif
#if (NGX_HTTP_SSL && defined SSL_R_CERT_CB_ERROR)
int ngx_http_ssl_certificate(ngx_ssl_conn_t *ssl_conn, void *arg);
#endif


ngx_int_t ngx_http_parse_request_line(ngx_http_request_t *r, ngx_buf_t *b);
ngx_int_t ngx_http_parse_uri(ngx_http_request_t *r);
ngx_int_t ngx_http_parse_complex_uri(ngx_http_request_t *r,
    ngx_uint_t merge_slashes);
ngx_int_t ngx_http_parse_status_line(ngx_http_request_t *r, ngx_buf_t *b,
    ngx_http_status_t *status);
ngx_int_t ngx_http_parse_unsafe_uri(ngx_http_request_t *r, ngx_str_t *uri,
    ngx_str_t *args, ngx_uint_t *flags);
ngx_int_t ngx_http_parse_header_line(ngx_http_request_t *r, ngx_buf_t *b,
    ngx_uint_t allow_underscores);
ngx_table_elt_t *ngx_http_parse_multi_header_lines(ngx_http_request_t *r,
    ngx_table_elt_t *headers, ngx_str_t *name, ngx_str_t *value);
ngx_table_elt_t *ngx_http_parse_set_cookie_lines(ngx_http_request_t *r,
    ngx_table_elt_t *headers, ngx_str_t *name, ngx_str_t *value);
ngx_int_t ngx_http_arg(ngx_http_request_t *r, u_char *name, size_t len,
    ngx_str_t *value);
void ngx_http_split_args(ngx_http_request_t *r, ngx_str_t *uri,
    ngx_str_t *args);
ngx_int_t ngx_http_parse_chunked(ngx_http_request_t *r, ngx_buf_t *b,
    ngx_http_chunked_t *ctx);


ngx_http_request_t *ngx_http_create_request(ngx_connection_t *c);
ngx_int_t ngx_http_process_request_uri(ngx_http_request_t *r);
ngx_int_t ngx_http_process_request_header(ngx_http_request_t *r);
void ngx_http_process_request(ngx_http_request_t *r);
void ngx_http_update_location_config(ngx_http_request_t *r);
void ngx_http_handler(ngx_http_request_t *r);
void ngx_http_run_posted_requests(ngx_connection_t *c);
ngx_int_t ngx_http_post_request(ngx_http_request_t *r,
    ngx_http_posted_request_t *pr);
void ngx_http_finalize_request(ngx_http_request_t *r, ngx_int_t rc);
void ngx_http_free_request(ngx_http_request_t *r, ngx_int_t rc);

void ngx_http_empty_handler(ngx_event_t *wev);
void ngx_http_request_empty_handler(ngx_http_request_t *r);


#define NGX_HTTP_LAST   1
#define NGX_HTTP_FLUSH  2

ngx_int_t ngx_http_send_special(ngx_http_request_t *r, ngx_uint_t flags);


ngx_int_t ngx_http_read_client_request_body(ngx_http_request_t *r,
    ngx_http_client_body_handler_pt post_handler);
ngx_int_t ngx_http_read_unbuffered_request_body(ngx_http_request_t *r);

ngx_int_t ngx_http_send_header(ngx_http_request_t *r);
ngx_int_t ngx_http_special_response_handler(ngx_http_request_t *r,
    ngx_int_t error);
ngx_int_t ngx_http_filter_finalize_request(ngx_http_request_t *r,
    ngx_module_t *m, ngx_int_t error);
void ngx_http_clean_header(ngx_http_request_t *r);


ngx_int_t ngx_http_discard_request_body(ngx_http_request_t *r);
void ngx_http_discarded_request_body_handler(ngx_http_request_t *r);
void ngx_http_block_reading(ngx_http_request_t *r);
void ngx_http_test_reading(ngx_http_request_t *r);


char *ngx_http_types_slot(ngx_conf_t *cf, ngx_command_t *cmd, void *conf);
char *ngx_http_merge_types(ngx_conf_t *cf, ngx_array_t **keys,
    ngx_hash_t *types_hash, ngx_array_t **prev_keys,
    ngx_hash_t *prev_types_hash, ngx_str_t *default_types);
ngx_int_t ngx_http_set_default_types(ngx_conf_t *cf, ngx_array_t **types,
    ngx_str_t *default_type);

#if (NGX_HTTP_DEGRADATION)
ngx_uint_t  ngx_http_degraded(ngx_http_request_t *);
#endif


#if (NGX_HTTP_V2)
ngx_int_t ngx_http_huff_decode(u_char *state, u_char *src, size_t len,
    u_char **dst, ngx_uint_t last, ngx_log_t *log);
size_t ngx_http_huff_encode(u_char *src, size_t len, u_char *dst,
    ngx_uint_t lower);
#endif


extern ngx_module_t  ngx_http_module;

extern ngx_str_t  ngx_http_html_default_types[];


extern ngx_http_output_header_filter_pt  ngx_http_top_header_filter;
extern ngx_http_output_body_filter_pt    ngx_http_top_body_filter;
extern ngx_http_request_body_filter_pt   ngx_http_top_request_body_filter;


#endif /* _NGX_HTTP_H_INCLUDED_ */