evhttp.h

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/*
 * Copyright (c) 2000-2004 Niels Provos <provos@citi.umich.edu>
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. The name of the author may not be used to endorse or promote products
 *    derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */
#ifndef _EVHTTP_H_
#define _EVHTTP_H_

#include <event.h>

#ifdef __cplusplus
extern "C" {
#endif

#ifdef WIN32
#define WIN32_LEAN_AND_MEAN
#include <windows.h>
#include <winsock2.h>
#undef WIN32_LEAN_AND_MEAN
#endif

/* Response codes */
#define HTTP_OK                 200
#define HTTP_NOCONTENT          204
#define HTTP_MOVEPERM           301
#define HTTP_MOVETEMP           302
#define HTTP_NOTMODIFIED        304
#define HTTP_BADREQUEST         400
#define HTTP_NOTFOUND           404
#define HTTP_SERVUNAVAIL        503

struct evhttp;
struct evhttp_request;
struct evkeyvalq;

struct evhttp *evhttp_new(struct event_base *base);

int evhttp_bind_socket(struct evhttp *http, const char *address, u_short port);

void evhttp_free(struct evhttp* http);

void evhttp_set_cb(struct evhttp *, const char *,
    void (*)(struct evhttp_request *, void *), void *);

int evhttp_del_cb(struct evhttp *, const char *);

void evhttp_set_gencb(struct evhttp *,
    void (*)(struct evhttp_request *, void *), void *);

void evhttp_set_timeout(struct evhttp *, int timeout_in_secs);

/* Request/Response functionality */

void evhttp_send_error(struct evhttp_request *req, int error,
    const char *reason);

void evhttp_send_reply(struct evhttp_request *req, int code,
    const char *reason, struct evbuffer *databuf);

/* Low-level response interface, for streaming/chunked replies */
void evhttp_send_reply_start(struct evhttp_request *, int, const char *);
void evhttp_send_reply_chunk(struct evhttp_request *, struct evbuffer *);
void evhttp_send_reply_end(struct evhttp_request *);

struct evhttp *evhttp_start(const char *address, u_short port);

/*
 * Interfaces for making requests
 */
enum evhttp_cmd_type { EVHTTP_REQ_GET, EVHTTP_REQ_POST, EVHTTP_REQ_HEAD };

enum evhttp_request_kind { EVHTTP_REQUEST, EVHTTP_RESPONSE };

struct evhttp_request {
#if defined(TAILQ_ENTRY)
        TAILQ_ENTRY(evhttp_request) next;
#else
struct {
        struct evhttp_request *tqe_next;
        struct evhttp_request **tqe_prev;
}       next;
#endif

        /* the connection object that this request belongs to */
        struct evhttp_connection *evcon;
        int flags;
#define EVHTTP_REQ_OWN_CONNECTION       0x0001
#define EVHTTP_PROXY_REQUEST            0x0002

        struct evkeyvalq *input_headers;
        struct evkeyvalq *output_headers;

        /* address of the remote host and the port connection came from */
        char *remote_host;
        u_short remote_port;

        enum evhttp_request_kind kind;
        enum evhttp_cmd_type type;

        char *uri;                      /* uri after HTTP request was parsed */

        char major;                     /* HTTP Major number */
        char minor;                     /* HTTP Minor number */

        int got_firstline;
        int response_code;              /* HTTP Response code */
        char *response_code_line;       /* Readable response */

        struct evbuffer *input_buffer;  /* read data */
        int ntoread;
        int chunked;

        struct evbuffer *output_buffer; /* outgoing post or data */

        /* Callback */
        void (*cb)(struct evhttp_request *, void *);
        void *cb_arg;

        /*
         * Chunked data callback - call for each completed chunk if
         * specified.  If not specified, all the data is delivered via
         * the regular callback.
         */
        void (*chunk_cb)(struct evhttp_request *, void *);
};

struct evhttp_request *evhttp_request_new(
        void (*cb)(struct evhttp_request *, void *), void *arg);

void evhttp_request_set_chunked_cb(struct evhttp_request *,
    void (*cb)(struct evhttp_request *, void *));

void evhttp_request_free(struct evhttp_request *req);

struct evhttp_connection *evhttp_connection_new(
        const char *address, unsigned short port);

void evhttp_connection_free(struct evhttp_connection *evcon);

void evhttp_connection_set_local_address(struct evhttp_connection *evcon,
    const char *address);

void evhttp_connection_set_timeout(struct evhttp_connection *evcon,
    int timeout_in_secs);

void evhttp_connection_set_retries(struct evhttp_connection *evcon,
    int retry_max);

void evhttp_connection_set_closecb(struct evhttp_connection *evcon,
    void (*)(struct evhttp_connection *, void *), void *);

void evhttp_connection_set_base(struct evhttp_connection *evcon,
    struct event_base *base);

void evhttp_connection_get_peer(struct evhttp_connection *evcon,
    char **address, u_short *port);

int evhttp_make_request(struct evhttp_connection *evcon,
    struct evhttp_request *req,
    enum evhttp_cmd_type type, const char *uri);

const char *evhttp_request_uri(struct evhttp_request *req);

/* Interfaces for dealing with HTTP headers */

const char *evhttp_find_header(const struct evkeyvalq *, const char *);
int evhttp_remove_header(struct evkeyvalq *, const char *);
int evhttp_add_header(struct evkeyvalq *, const char *, const char *);
void evhttp_clear_headers(struct evkeyvalq *);

/* Miscellaneous utility functions */


char *evhttp_encode_uri(const char *uri);


char *evhttp_decode_uri(const char *uri);


void evhttp_parse_query(const char *uri, struct evkeyvalq *);


char *evhttp_htmlescape(const char *html);

#ifdef __cplusplus
}
#endif

#endif /* _EVHTTP_H_ */

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