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/*
* JSON web bridge for PMAPI.
*
* Copyright (c) 2011-2013 Red Hat Inc.
*
* This program 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 2 of the License, or (at your
* option) any later version.
*
* This program 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 this program; if not, write to the Free Software Foundation, Inc.,
* 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include "pmwebapi.h"
#include "config.h"
/* ------------------------------------------------------------------------ */
static const char *guess_content_type (const char* filename)
{
const char *extension = rindex (filename, '.');
if (extension == NULL) return NULL;
/* One could go all out and parse /etc/mime.types, or one can do this ... */
if (0 == strcasecmp (extension, "html")) return "text/html";
if (0 == strcasecmp (extension, "js")) return "text/javascript";
if (0 == strcasecmp (extension, "json")) return "application/json";
if (0 == strcasecmp (extension, "txt")) return "text/plain";
if (0 == strcasecmp (extension, "xml")) return "text/xml";
if (0 == strcasecmp (extension, "svg")) return "image/svg+xml";
if (0 == strcasecmp (extension, "png")) return "image/png";
if (0 == strcasecmp (extension, "jpg")) return "image/jpg";
return NULL;
}
static const char *create_rfc822_date (time_t t)
{
static char datebuf[80]; /* if-threaded: unstaticify */
struct tm *now = gmtime (& t);
size_t rc = strftime (datebuf, sizeof(datebuf), "%a, %d %b %Y %T %z", now);
if (rc <= 0 || rc >= sizeof(datebuf)) return NULL;
return datebuf;
}
/* Respond to a GET request, not under the pmwebapi URL prefix. This
is a mini fileserver, just for small standalone installations of
pmwebapi-based web front-ends. */
int pmwebres_respond (void *cls, struct MHD_Connection *connection,
const char* url)
{
int fd = -1;
int rc;
char filename [PATH_MAX];
struct stat fds;
unsigned int resp_code = MHD_HTTP_OK;
struct MHD_Response *resp;
const char *ctype = NULL;
static const char error_page[] =
"PMRESAPI error"; /* could also be an actual error page... */
(void) cls;
assert (resourcedir != NULL); /* facility is enabled at all */
assert (url[0] == '/');
rc = snprintf (filename, sizeof(filename), "%s%s", resourcedir, url);
if (rc < 0 || rc >= (int)sizeof(filename))
goto error_response;
/* Reject some obvious ways of escaping resourcedir. */
if (NULL != strstr (filename, "/../")) {
pmweb_notify (LOG_ERR, connection, "pmwebres suspicious url %s\n", url);
goto error_response;
}
fd = open (filename, O_RDONLY);
if (fd < 0) {
pmweb_notify (LOG_ERR, connection, "pmwebres open %s failed (%d)\n", filename, fd);
resp_code = MHD_HTTP_NOT_FOUND;
goto error_response;
}
rc = fstat (fd, &fds);
if (rc < 0) {
pmweb_notify (LOG_ERR, connection, "pmwebres stat %s failed (%d)\n", filename, rc);
close (fd);
goto error_response;
}
/* XXX: handle if-modified-since */
if (! S_ISREG (fds.st_mode)) {
pmweb_notify (LOG_ERR, connection, "pmwebres non-file %s attempted\n", filename);
close (fd);
/* XXX: list directory, or redirect to index.html instead? */
resp_code = MHD_HTTP_FORBIDDEN;
goto error_response;
}
if (verbosity > 2)
pmweb_notify (LOG_INFO, connection, "pmwebres serving file %s.\n", filename);
resp = MHD_create_response_from_fd_at_offset (fds.st_size, fd, 0); /* auto-closes fd */
if (resp == NULL) {
pmweb_notify (LOG_ERR, connection, "MHD_create_response_from_callback failed\n");
goto error_response;
}
/* Guess at a suitable MIME content-type. */
ctype = guess_content_type (filename);
if (ctype)
(void) MHD_add_response_header (resp, "Content-Type", ctype);
/* And since we're generous to a fault, supply a timestamp field to
assist caching. */
ctype = create_rfc822_date (fds.st_mtime);
if (ctype)
(void) MHD_add_response_header (resp, "Last-Modified", ctype);
/* Add a 5-minute expiry. */
ctype = create_rfc822_date (time(0) + 300); /* XXX: configure */
if (ctype)
(void) MHD_add_response_header (resp, "Expires", ctype);
(void) MHD_add_response_header (resp, "Cache-Control", "public");
rc = MHD_queue_response (connection, resp_code, resp);
MHD_destroy_response (resp);
return rc;
error_response:
resp = MHD_create_response_from_buffer (strlen(error_page),
(char*)error_page,
MHD_RESPMEM_PERSISTENT);
if (resp == NULL) {
pmweb_notify (LOG_ERR, connection, "MHD_create_response_from_callback failed\n");
return MHD_NO;
}
(void) MHD_add_response_header (resp, "Content-Type", "text/plain");
rc = MHD_queue_response (connection, resp_code, resp);
MHD_destroy_response (resp);
if (rc != MHD_YES) {
pmweb_notify (LOG_ERR, connection, "MHD_queue_response failed\n");
return MHD_NO;
}
return rc;
}
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