/*      $Id: http.h,v 1.3 2017/01/25 13:52:53 inoguchi Exp $ */
/*
 * Copyright (c) 2016 Kristaps Dzonsons <kristaps@bsd.lv>
 *
 * Permission to use, copy, modify, and distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHORS DISCLAIM ALL WARRANTIES
 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR
 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 */
#ifndef HTTP_H
#define HTTP_H

struct  source {
        int      family; /* 4 (PF_INET) or 6 (PF_INET6) */
        char    *ip; /* IPV4 or IPV6 address */
};

struct  http;

/*
 * Write and read callbacks to allow HTTP and HTTPS.
 * Both of these return the number of bytes read (or written) or -1 on
 * failure.
 * 0 bytes read means that the connection has closed.
 */
typedef ssize_t (*writefp)(const void *, size_t, const struct http *);
typedef ssize_t (*readfp)(char *, size_t, const struct http *);

/*
 * HTTP/S header pair.
 * There's also a cooked-up pair, "Status", with the status code.
 * Both strings are NUL-terminated.
 */
struct  httphead {
        const char      *key;
        const char      *val;
};

/*
 * Grab all information from a transfer.
 * DO NOT free any parts of this, and editing the parts (e.g., changing
 * the underlying strings) will persist; so in short, don't.
 * All of these values will be set upon http_get() success.
 */
struct  httpget {
        struct httpxfer *xfer; /* underlying transfer */
        struct http     *http; /* underlying connection */
        int              code; /* return code */
        struct httphead *head; /* headers */
        size_t           headsz; /* number of headers */
        char            *headpart; /* header buffer */
        size_t           headpartsz; /* size of headpart */
        char            *bodypart; /* body buffer */
        size_t           bodypartsz; /* size of bodypart */
};

int              http_init(void);

/* Convenience functions. */
struct httpget  *http_get(const struct source *, size_t,
                        const char *, short, const char *,
                        const void *, size_t);
void             http_get_free(struct httpget *);

/* Allocation and release. */
struct http     *http_alloc(const struct source *, size_t,
                        const char *, short, const char *);
void             http_free(struct http *);
struct httpxfer *http_open(const struct http *, const void *, size_t);
void             http_close(struct httpxfer *);
void             http_disconnect(struct http *);

/* Access. */
char            *http_head_read(const struct http *,
                        struct httpxfer *, size_t *);
struct httphead *http_head_parse(const struct http *,
                        struct httpxfer *, size_t *);
char            *http_body_read(const struct http *,
                        struct httpxfer *, size_t *);
int              http_head_status(const struct http *,
                        struct httphead *, size_t);
struct httphead *http_head_get(const char *,
                        struct httphead *, size_t);

#endif /* HTTP_H */