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/*
This file is part of TALER
(C) 2014 Christian Grothoff (and other contributing authors)
TALER is free software; you can redistribute it and/or modify it under the
terms of the GNU General Public License as published by the Free Software
Foundation; either version 3, or (at your option) any later version.
TALER 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 General Public License for more details.
You should have received a copy of the GNU General Public License along with
TALER; see the file COPYING. If not, If not, see <http://www.gnu.org/licenses/>
*/
/**
* @file merchant/backend/taler-merchant-httpd.c
* @brief HTTP serving layer mainly intended to communicate with the frontend
* @author Marcello Stanisci
*/
#include "platform.h"
#include <microhttpd.h>
#include <gnunet/gnunet_util_lib.h>
/**
* Shorthand for exit jumps.
*/
#define EXITIF(cond) \
do { \
if (cond) { GNUNET_break (0); goto EXITIF_exit; } \
} while (0)
// task 1. Just implement a hello world server launched a` la GNUNET
/**
* The port we are running on
*/
unsigned short port;
/**
* The MHD Daemon
*/
static struct MHD_Daemon *mhd;
/**
* Global return code
*/
static int result;
/**
* Generate the 'hello world' response
* @param connection a MHD connection
* @param resp where to store the response for the calling function
* @return HTTP status code reflecting the operation outcome
*
*/
static unsigned int
generate_hello (struct MHD_Response **resp) // this parameter was preceded by a '_' in its original file. Why?
{
const char *hello = "Hello customer";
unsigned int ret;
*resp = MHD_create_response_from_buffer (strlen (hello), (void *) hello,
MHD_RESPMEM_PERSISTENT);
ret = 200;
return ret;
}
/**
* Manage a non 200 HTTP status. I.e. it shows a 'failure' page to
* the client
* @param connection the channel thorugh which send the message
* @status the HTTP status to examine
* @return GNUNET_OK on successful message sending, GNUNET_SYSERR upon error
*
*/
static int
failure_resp (struct MHD_Connection *connection, unsigned int status)
{
printf ("called failure mgmt\n");
static char page_404[]="\
<!DOCTYPE html> \
<html><title>Resource not found</title><body><center> \
<h3>The resource you are looking for is not found.</h3> \
</center></body></html>";
static char page_500[]="\
<!DOCTYPE html> <html><title>Internal Server Error</title><body><center> \
<h3>The server experienced an internal error and hence cannot serve your \
request</h3></center></body></html>";
struct MHD_Response *resp;
char *page;
size_t size;
#define PAGE(number) \
do {page=page_ ## number; size=sizeof(page_ ## number)-1;} while(0)
GNUNET_assert (400 <= status);
resp = NULL;
switch (status)
{
case 404:
PAGE(404);
break;
default:
status = 500;
case 500:
PAGE(500);
}
#undef PAGE
EXITIF (NULL == (resp = MHD_create_response_from_buffer (size,
page,
MHD_RESPMEM_PERSISTENT)));
EXITIF (MHD_YES != MHD_queue_response (connection, status, resp));
MHD_destroy_response (resp);
return GNUNET_OK;
EXITIF_exit:
if (NULL != resp)
MHD_destroy_response (resp);
return GNUNET_SYSERR;
}
/**
* A client has requested the given url using the given method
* (#MHD_HTTP_METHOD_GET, #MHD_HTTP_METHOD_PUT,
* #MHD_HTTP_METHOD_DELETE, #MHD_HTTP_METHOD_POST, etc). The callback
* must call MHD callbacks to provide content to give back to the
* client and return an HTTP status code (i.e. #MHD_HTTP_OK,
* #MHD_HTTP_NOT_FOUND, etc.).
*
* @param cls argument given together with the function
* pointer when the handler was registered with MHD
* @param url the requested url
* @param method the HTTP method used (#MHD_HTTP_METHOD_GET,
* #MHD_HTTP_METHOD_PUT, etc.)
* @param version the HTTP version string (i.e.
* #MHD_HTTP_VERSION_1_1)
* @param upload_data the data being uploaded (excluding HEADERS,
* for a POST that fits into memory and that is encoded
* with a supported encoding, the POST data will NOT be
* given in upload_data and is instead available as
* part of #MHD_get_connection_values; very large POST
* data *will* be made available incrementally in
* @a upload_data)
* @param upload_data_size set initially to the size of the
* @a upload_data provided; the method must update this
* value to the number of bytes NOT processed;
* @param con_cls pointer that the callback can set to some
* address and that will be preserved by MHD for future
* calls for this request; since the access handler may
* be called many times (i.e., for a PUT/POST operation
* with plenty of upload data) this allows the application
* to easily associate some request-specific state.
* If necessary, this state can be cleaned up in the
* global #MHD_RequestCompletedCallback (which
* can be set with the #MHD_OPTION_NOTIFY_COMPLETED).
* Initially, `*con_cls` will be NULL.
* @return #MHD_YES if the connection was handled successfully,
* #MHD_NO if the socket must be closed due to a serios
* error while handling the request
*/
static int
url_handler (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 **con_cls)
{
unsigned int status;
unsigned int no_destroy;
struct MHD_Response *resp;
printf ("hi, just called web micro server with url %s\n", url);
#define URL_HELLO "/hello"
no_destroy = 0;
resp = NULL;
status = 500;
if (0 == strncasecmp (url, URL_HELLO, sizeof (URL_HELLO)))
{
if (0 == strcmp (MHD_HTTP_METHOD_GET, method))
status = generate_hello (&resp); //TBD
else
GNUNET_break (0);
}
else status = 404;
if (NULL != resp)
{
EXITIF (MHD_YES != MHD_queue_response (connection, status, resp));
if (!no_destroy)
MHD_destroy_response (resp);
}
else
EXITIF (GNUNET_OK != failure_resp (connection, status));
return MHD_YES;
EXITIF_exit:
result = GNUNET_SYSERR;
//GNUNET_SCHEDULER_shutdown (); to a later stage, maybe
return MHD_NO;
}
/**
* The main function of the serve tool
*
* @param argc number of arguments from the command line
* @param argv command line arguments
* @return 0 ok, 1 on error
*/
int
main (int argc, char *const *argv)
{
port = 9966;
mhd = MHD_start_daemon (MHD_USE_SELECT_INTERNALLY,
port,
NULL, NULL,
&url_handler, NULL,
MHD_OPTION_END);
getchar ();
MHD_stop_daemon (mhd);
return 0;
}
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