source: mainline/uspace/lib/http/src/request.c

/*
 * Copyright (c) 2013 Martin Sucha
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * - Redistributions of source code must retain the above copyright
 *   notice, this list of conditions and the following disclaimer.
 * - 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.
 * - 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.
 */

/** @addtogroup http
 * @{
 */
/**
 * @file
 */

#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <str.h>
#include <macros.h>

#include <inet/tcp.h>

#include <http/http.h>

#define HTTP_METHOD_LINE "%s %s HTTP/1.1\r\n"
#define HTTP_REQUEST_LINE "\r\n"

http_request_t *http_request_create(const char *method, const char *path)
{
        http_request_t *req = malloc(sizeof(http_request_t));
        if (req == NULL)
                return NULL;

        req->method = str_dup(method);
        if (req->method == NULL) {
                free(req);
                return NULL;
        }

        req->path = str_dup(path);
        if (req->path == NULL) {
                free(req->method);
                free(req);
                return NULL;
        }

        http_headers_init(&req->headers);

        return req;
}

void http_request_destroy(http_request_t *req)
{
        free(req->method);
        free(req->path);
        http_headers_clear(&req->headers);
        free(req);
}

static ssize_t http_encode_method(char *buf, size_t buf_size,
    const char *method, const char *path)
{
        return snprintf(buf, buf_size, HTTP_METHOD_LINE, method, path);
}

errno_t http_request_format(http_request_t *req, char **out_buf,
    size_t *out_buf_size)
{
        /* Compute the size of the request */
        ssize_t meth_size = http_encode_method(NULL, 0, req->method, req->path);
        if (meth_size < 0)
                return EINVAL;
        size_t size = meth_size;

        http_headers_foreach(req->headers, header) {
                ssize_t header_size = http_header_encode(header, NULL, 0);
                if (header_size < 0)
                        return EINVAL;
                size += header_size;
        }
        size += str_length(HTTP_REQUEST_LINE);

        char *buf = malloc(size);
        if (buf == NULL)
                return ENOMEM;

        char *pos = buf;
        size_t pos_size = size;
        ssize_t written = http_encode_method(pos, pos_size, req->method, req->path);
        if (written < 0) {
                free(buf);
                return EINVAL;
        }
        pos += written;
        pos_size -= written;

        http_headers_foreach(req->headers, header) {
                written = http_header_encode(header, pos, pos_size);
                if (written < 0) {
                        free(buf);
                        return EINVAL;
                }
                pos += written;
                pos_size -= written;
        }

        size_t rlsize = str_size(HTTP_REQUEST_LINE);
        memcpy(pos, HTTP_REQUEST_LINE, rlsize);
        pos_size -= rlsize;
        assert(pos_size == 0);

        *out_buf = buf;
        *out_buf_size = size;
        return EOK;
}

errno_t http_send_request(http_t *http, http_request_t *req)
{
        char *buf = NULL;
        size_t buf_size = 0;

        errno_t rc = http_request_format(req, &buf, &buf_size);
        if (rc != EOK)
                return rc;

        rc = tcp_conn_send(http->conn, buf, buf_size);
        free(buf);

        return rc;
}

/** @}
 */