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/*
This file is part of libmicrohttpd
Copyright (C) 2019 Christian Grothoff (and other contributing authors)
This library 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.
This library 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 this library; if not, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
/**
* @file http_compression.c
* @brief minimal example for how to compress HTTP response
* @author Silvio Clecio (silvioprog)
*/
#include "platform.h"
#include <zlib.h>
#include <microhttpd.h>
#define PAGE \
"<html><head><title>HTTP compression</title></head><body>Hello, " \
"hello, hello. This is a 'hello world' message for the world, " \
"repeat, for the world.</body></html>"
static enum MHD_Result
can_compress (struct MHD_Connection *con)
{
const char *ae;
const char *de;
ae = MHD_lookup_connection_value (con,
MHD_HEADER_KIND,
MHD_HTTP_HEADER_ACCEPT_ENCODING);
if (NULL == ae)
return MHD_NO;
if (0 == strcmp (ae,
"*"))
return MHD_YES;
de = strstr (ae,
"deflate");
if (NULL == de)
return MHD_NO;
if (((de == ae) ||
(de[-1] == ',') ||
(de[-1] == ' ')) &&
((de[strlen ("deflate")] == '\0') ||
(de[strlen ("deflate")] == ',') ||
(de[strlen ("deflate")] == ';')))
return MHD_YES;
return MHD_NO;
}
static enum MHD_Result
body_compress (void **buf,
size_t *buf_size)
{
Bytef *cbuf;
uLongf cbuf_size;
int ret;
cbuf_size = compressBound (*buf_size);
cbuf = malloc (cbuf_size);
if (NULL == cbuf)
return MHD_NO;
ret = compress (cbuf,
&cbuf_size,
(const Bytef *) *buf,
*buf_size);
if ((Z_OK != ret) ||
(cbuf_size >= *buf_size))
{
/* compression failed */
free (cbuf);
return MHD_NO;
}
free (*buf);
*buf = (void *) cbuf;
*buf_size = (size_t) cbuf_size;
return MHD_YES;
}
static enum MHD_Result
ahc_echo (void *cls,
struct MHD_Connection *connection,
const char *url,
const char *method,
const char *version,
const char *upload_data, size_t *upload_data_size, void **req_cls)
{
struct MHD_Response *response;
enum MHD_Result ret;
enum MHD_Result comp;
size_t body_len;
char *body_str;
(void) cls; /* Unused. Silent compiler warning. */
(void) url; /* Unused. Silent compiler warning. */
(void) version; /* Unused. Silent compiler warning. */
(void) upload_data; /* Unused. Silent compiler warning. */
(void) upload_data_size; /* Unused. Silent compiler warning. */
if (0 != strcmp (method, "GET"))
return MHD_NO; /* unexpected method */
if (! *req_cls)
{
*req_cls = (void *) 1;
return MHD_YES;
}
*req_cls = NULL;
body_str = strdup (PAGE);
if (NULL == body_str)
{
return MHD_NO;
}
body_len = strlen (body_str);
/* try to compress the body */
comp = MHD_NO;
if (MHD_YES ==
can_compress (connection))
comp = body_compress ((void **) &body_str,
&body_len);
response =
MHD_create_response_from_buffer_with_free_callback (body_len,
body_str,
&free);
if (NULL == response)
{
free (body_str);
return MHD_NO;
}
if (MHD_YES == comp)
{
/* Need to indicate to client that body is compressed */
if (MHD_NO ==
MHD_add_response_header (response,
MHD_HTTP_HEADER_CONTENT_ENCODING,
"deflate"))
{
MHD_destroy_response (response);
return MHD_NO;
}
}
ret = MHD_queue_response (connection,
200,
response);
MHD_destroy_response (response);
return ret;
}
int
main (int argc, char *const *argv)
{
struct MHD_Daemon *d;
if (argc != 2)
{
printf ("%s PORT\n", argv[0]);
return 1;
}
d = MHD_start_daemon (MHD_USE_AUTO | MHD_USE_INTERNAL_POLLING_THREAD
| MHD_USE_ERROR_LOG,
atoi (argv[1]), NULL, NULL,
&ahc_echo, NULL,
MHD_OPTION_END);
if (NULL == d)
return 1;
(void) getc (stdin);
MHD_stop_daemon (d);
return 0;
}
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