/*
 * HTTP definitions
 * Copyright (c) 2010 Josh Allmann
 *
 * This file is part of FFmpeg.
 *
 * FFmpeg is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * FFmpeg is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with FFmpeg; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
 */

#ifndef AVFORMAT_HTTP_H
#define AVFORMAT_HTTP_H

#include <string.h>

#include "libavutil/dict.h"
#include "libavutil/error.h"
#include "libavutil/log.h"
#include "url.h"

#define HTTP_HEADERS_SIZE 4096

/**
 * Parsed form of a response status line.
 */
typedef struct HTTPStatusLine {
    char        version[4]; /**< protocol version, e.g. "1.1" */
    int         code;       /**< response status code */
    const char *reason;     /**< reason phrase, points into the parsed line */
    int         willclose;  /**< the version implies the connection will close */
} HTTPStatusLine;

/**
 * Parse the status line of an HTTP response.
 *
 * @param logctx context used for logging, may be NULL
 * @param line NUL terminated status line, without its trailing CRLF
 * @param st filled in with the parsed status line
 * @return 0 on success, a negative AVERROR code on failure
 */
int ff_http_parse_status_line(void *logctx, const char *line,
                              HTTPStatusLine *st);

/**
 * Split an in-band ICY metadata packet into its "Key='Value';" pairs.
 *
 * @param logctx context used for logging, may be NULL
 * @param metadata dictionary the pairs are stored in
 * @param data NUL terminated packet, split in place
 */
static inline void ff_http_parse_icy_packet(void *logctx,
                                            AVDictionary **metadata, char *data)
{
    char *next = data;

    while (*next) {
        char *key = next, *val, *end;

        if (!(val = strstr(key, "='")) || !(end = strstr(val, "';")))
            break;

        *val = '\0';
        *end = '\0';
        val += 2;

        av_dict_set(metadata, key, val, 0);
        av_log(logctx, AV_LOG_VERBOSE, "Metadata update for %s: %s\n", key, val);

        next = end + 2;
    }
}

/**
 * Initialize the authentication state based on another HTTP URLContext.
 * This can be used to pre-initialize the authentication parameters if
 * they are known beforehand, to avoid having to do an initial failing
 * request just to get the parameters.
 *
 * @param dest URL context whose authentication state gets updated
 * @param src URL context whose authentication state gets copied
 */
void ff_http_init_auth_state(URLContext *dest, const URLContext *src);

/**
 * Send a new HTTP request, reusing the old connection.
 *
 * @param h pointer to the resource
 * @param uri uri used to perform the request
 * @return a negative value if an error condition occurred, 0
 * otherwise
 */
int ff_http_do_new_request(URLContext *h, const char *uri);

/**
 * Send a new HTTP request, reusing the old connection.
 *
 * @param h pointer to the resource
 * @param uri uri used to perform the request
 * @param options  A dictionary filled with HTTP options. On return
 * this parameter will be destroyed and replaced with a dict containing options
 * that were not found. May be NULL.
 * @return a negative value if an error condition occurred, 0
 * otherwise
 */
int ff_http_do_new_request2(URLContext *h, const char *uri, AVDictionary **options);

const char* ff_http_get_new_location(URLContext *h);

static inline int ff_http_averror(int status_code, int default_averror)
{
    switch (status_code) {
        case 400: return AVERROR_HTTP_BAD_REQUEST;
        case 401: return AVERROR_HTTP_UNAUTHORIZED;
        case 403: return AVERROR_HTTP_FORBIDDEN;
        case 404: return AVERROR_HTTP_NOT_FOUND;
        case 429: return AVERROR_HTTP_TOO_MANY_REQUESTS;
        default: break;
    }
    if (status_code >= 400 && status_code <= 499)
        return AVERROR_HTTP_OTHER_4XX;
    else if (status_code >= 500)
        return AVERROR_HTTP_SERVER_ERROR;
    else
        return default_averror;
}

#endif /* AVFORMAT_HTTP_H */