// Copyright (c) 2004-2010 Sergey Lyubka
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.


// NOTE: This is a SEVERELY stripped down version of mongoose, which only
// supports GET, POST and DELETE HTTP commands, no CGI, no file or directory
// access, no ACLs or authentication, and no proxying and no SSL.  HTTP Header
// limit is 16 instead of 64, as it's not supposed to be called from standard
// browsers. And most options are removed.

#ifndef MONGOOSE_HEADER_INCLUDED
#define  MONGOOSE_HEADER_INCLUDED

#ifdef __cplusplus
extern "C" {
#endif // __cplusplus

#include <sys/socket.h>
#include <netinet/in.h>
#include <netinet/ip.h>

struct mg_context;     // Handle for the HTTP service itself
struct mg_connection;  // Handle for the individual connection


// This structure contains information about the HTTP request.
struct mg_request_info {
  void *user_data;       // User-defined pointer passed to mg_start()
  char *request_method;  // "GET", "POST", etc
  char *uri;             // URL-decoded URI
  char *http_version;    // E.g. "1.0", "1.1"
  char *query_string;    // \0 - terminated
  char *request_body;    // \0 - terminated
  char *log_message;     // Mongoose error log message
  struct sockaddr_in local_addr; // Our server's address for this connection
  struct sockaddr_in remote_addr; // The remote address for this connection
  int status_code;       // HTTP reply status code
  int num_headers;       // Number of headers
  struct mg_header {
    char *name;          // HTTP header name
    char *value;         // HTTP header value
  } http_headers[16];    // Maximum 16 headers
};

// Various events on which user-defined function is called by Mongoose.
enum mg_event {
  MG_NEW_REQUEST,   // New HTTP request has arrived from the client
  MG_HTTP_ERROR,    // HTTP error must be returned to the client
  MG_EVENT_LOG,     // Mongoose logs an event, request_info.log_message
};

// Prototype for the user-defined function. Mongoose calls this function
// on every event mentioned above.
//
// Parameters:
//   event: which event has been triggered.
//   conn: opaque connection handler. Could be used to read, write data to the
//         client, etc. See functions below that accept "mg_connection *".
//   request_info: Information about HTTP request.
//
// Return:
//   If handler returns non-NULL, that means that handler has processed the
//   request by sending appropriate HTTP reply to the client. Mongoose treats
//   the request as served.
//   If callback returns NULL, that means that callback has not processed
//   the request. Handler must not send any data to the client in this case.
//   Mongoose proceeds with request handling as if nothing happened.
typedef void * (*mg_callback_t)(enum mg_event event,
                                struct mg_connection *conn,
                                const struct mg_request_info *request_info);


// Start web server.
//
// Parameters:
//   callback: user defined event handling function or NULL.
//
// Example:
//   struct mg_context *ctx = mg_start(&my_func, NULL);
//
// Please refer to http://code.google.com/p/mongoose/wiki/MongooseManual
// for the list of valid option and their possible values.
//
// Return:
//   web server context, or NULL on error.
struct mg_context *mg_start(mg_callback_t callback, void *user_data, int port);


// Stop the web server.
//
// Must be called last, when an application wants to stop the web server and
// release all associated resources. This function blocks until all Mongoose
// threads are stopped. Context pointer becomes invalid.
void mg_stop(struct mg_context *);


// Send data to the client.
int mg_write(struct mg_connection *, const void *buf, size_t len);


// Send data to the browser using printf() semantics.
//
// Works exactly like mg_write(), but allows to do message formatting.
// Note that mg_printf() uses internal buffer of size IO_BUF_SIZE
// (8 Kb by default) as temporary message storage for formatting. Do not
// print data that is bigger than that, otherwise it will be truncated.
int mg_printf(struct mg_connection *, const char *fmt, ...);


// Read data from the remote end, return number of bytes read.
int mg_read(struct mg_connection *, void *buf, size_t len);


// Get the value of particular HTTP header.
//
// This is a helper function. It traverses request_info->http_headers array,
// and if the header is present in the array, returns its value. If it is
// not present, NULL is returned.
const char *mg_get_header(const struct mg_connection *, const char *name);


// Return Mongoose version.
const char *mg_version(void);


// MD5 hash given strings.
// Buffer 'buf' must be 33 bytes long. Varargs is a NULL terminated list of
// asciiz strings. When function returns, buf will contain human-readable
// MD5 hash. Example:
//   char buf[33];
//   mg_md5(buf, "aa", "bb", NULL);
void mg_md5(char *buf, ...);

void mg_send_http_error(struct mg_connection *conn, int status,
                        const char *reason, const char *fmt, ...);
int mg_get_listen_addr(struct mg_context *ctx, struct sockaddr *addr,
                       socklen_t *addrlen);

#ifdef __cplusplus
}
#endif // __cplusplus

#endif // MONGOOSE_HEADER_INCLUDED