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/* httpd.c
*
* Copyright 2022 Christian Hergert <chergert@redhat.com>
*
* 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 General Public License along
* with this program. If not, see <http://www.gnu.org/licenses/>.
*
* SPDX-License-Identifier: LGPL-2.1-or-later
*/
#include "config.h"
#include <libdex.h>
#include <libsoup/soup.h>
#include <unistd.h>
static const char *errbody = "<html><body><h1>Not Found</h1></body></html>";
typedef struct
{
SoupServer *server;
SoupServerMessage *message;
char *path;
GHashTable *query;
} Request;
static void
request_free (gpointer data)
{
Request *request = data;
g_clear_pointer (&request->path, g_free);
g_clear_pointer (&request->query, g_hash_table_unref);
g_clear_object (&request->message);
g_clear_object (&request->server);
g_free (request);
}
static void
request_pause (Request *request)
{
#if SOUP_CHECK_VERSION(3, 2, 0)
soup_server_message_pause (request->message);
#else
soup_server_pause_message (request->server, request->message);
#endif
}
static void
request_unpause (Request *request)
{
#if SOUP_CHECK_VERSION(3, 2, 0)
soup_server_message_unpause (request->message);
#else
soup_server_unpause_message (request->server, request->message);
#endif
}
static DexFuture *
request_fiber (gpointer user_data)
{
Request *request = user_data;
SoupMessageHeaders *headers;
const char *path = request->path;
GFileInfo *file_info;
GError *error = NULL;
GFile *file;
GFileType file_type;
while (path[0] == '/')
path++;
if (path[0] == 0)
path = ".";
file = g_file_new_for_path (path);
file_info = dex_await_object (dex_file_query_info (file,
G_FILE_ATTRIBUTE_STANDARD_DISPLAY_NAME","
G_FILE_ATTRIBUTE_STANDARD_TYPE","
G_FILE_ATTRIBUTE_STANDARD_SIZE",",
G_FILE_QUERY_INFO_NOFOLLOW_SYMLINKS,
G_PRIORITY_DEFAULT),
&error);
if (file_info != NULL)
file_type = g_file_info_get_file_type (file_info);
else
file_type = G_FILE_TYPE_UNKNOWN;
headers = soup_server_message_get_response_headers (request->message);
if (soup_server_message_get_method (request->message) == SOUP_METHOD_HEAD)
{
char *length = g_strdup_printf ("%"G_GOFFSET_FORMAT, g_file_info_get_size (file_info));
soup_message_headers_append (headers, "Content-Length", length);
soup_server_message_set_status (request->message, SOUP_STATUS_OK, NULL);
g_free (length);
goto unpause;
}
/* TODO: It would be nice to use io_uring_prep_openat() via the
* AIO backend here so that we can multiplex without hitting the
* GIO async aio threadpool. That will require additions to
* DexAioBackend to accomidate it, but would save us potentially
* clogging the GIO pool as well as avoiding blocking on open()
* in a fiber/worker.
*/
if (file_type == G_FILE_TYPE_REGULAR)
{
SoupMessageBody *body = soup_server_message_get_response_body (request->message);
goffset to_read = g_file_info_get_size (file_info);
GInputStream *stream;
gsize buflen = to_read;
if (to_read > 4096*16)
buflen = 1024*64 - 2*GLIB_SIZEOF_VOID_P;
if (!(stream = dex_await_object (dex_file_read (file, G_PRIORITY_DEFAULT), &error)))
goto respond_404;
soup_message_headers_set_encoding (headers, SOUP_ENCODING_CHUNKED);
soup_server_message_set_status (request->message, SOUP_STATUS_OK, NULL);
for (;;)
{
guint8 *buffer = g_malloc (buflen);
gssize len;
len = dex_await_int64 (dex_input_stream_read (stream, buffer, MIN (to_read, buflen), G_PRIORITY_DEFAULT), &error);
if (error != NULL || len <= 0)
break;
soup_message_body_append (body, SOUP_MEMORY_TAKE, buffer, len);
to_read -= len;
if (to_read <= 0)
break;
}
soup_message_body_complete (body);
}
else if (file_type == G_FILE_TYPE_DIRECTORY)
{
GFileEnumerator *enumerator;
GString *body;
GList *files;
gsize len;
if (!(enumerator = dex_await_object (dex_file_enumerate_children (file,
G_FILE_ATTRIBUTE_STANDARD_DISPLAY_NAME","
G_FILE_ATTRIBUTE_STANDARD_SIZE",",
G_FILE_QUERY_INFO_NOFOLLOW_SYMLINKS,
G_PRIORITY_DEFAULT),
&error)))
goto respond_404;
soup_server_message_set_status (request->message, SOUP_STATUS_OK, NULL);
body = g_string_new (NULL);
g_string_append_printf (body, "<html><body><h1>/%s</h1><ul>",
g_str_equal (path, ".") ? "" : path);
while ((files = dex_await_boxed (dex_file_enumerator_next_files (enumerator, 100, G_PRIORITY_DEFAULT), &error)))
{
for (const GList *iter = files; iter; iter = iter->next)
{
GFileInfo *info = iter->data;
goffset size = g_file_info_get_size (info);
g_string_append_printf (body,
"<li><a href=\"%s/%s\">%s%s</a> - %"G_GOFFSET_FORMAT"</li>\n",
path,
g_file_info_get_name (info),
g_file_info_get_display_name (info),
g_file_info_get_file_type (info) == G_FILE_TYPE_DIRECTORY ? "/" : "",
size);
g_object_unref (info);
}
g_list_free (files);
}
g_string_append (body, "</h1></body></html>");
len = body->len;
soup_server_message_set_response (request->message,
"text/html",
SOUP_MEMORY_TAKE,
g_string_free (body, FALSE),
len);
}
else
{
respond_404:
soup_server_message_set_response (request->message,
"text/html",
SOUP_MEMORY_COPY,
errbody,
strlen (errbody));
}
unpause:
request_unpause (request);
g_clear_object (&file_info);
g_clear_object (&file);
g_clear_error (&error);
return NULL;
}
static void
handle_message (SoupServer *server,
SoupServerMessage *message,
const char *path,
GHashTable *query,
gpointer user_data)
{
Request *request;
const char *method;
g_assert (SOUP_IS_SERVER (server));
g_assert (SOUP_IS_SERVER_MESSAGE (message));
g_assert (path != NULL);
method = soup_server_message_get_method (message);
if (method != SOUP_METHOD_GET && method != SOUP_METHOD_HEAD)
{
soup_server_message_set_status (message, SOUP_STATUS_NOT_IMPLEMENTED, NULL);
return;
}
request = g_new0 (Request, 1);
request->server = g_object_ref (server);
request->message = g_object_ref (message);
request->path = g_strdup (path);
request->query = query ? g_hash_table_ref (query) : NULL;
request_pause (request);
dex_future_disown (dex_scheduler_spawn (NULL, 0, request_fiber, request, request_free));
}
static void
print_uris (SoupServer *server)
{
GSList *uris;
g_assert (SOUP_IS_SERVER (server));
if ((uris = soup_server_get_uris (server)))
{
for (const GSList *iter = uris; iter; iter = iter->next)
{
GUri *uri = iter->data;
char *str = g_uri_to_string (uri);
g_printerr ("Listening on %s\n", str);
g_free (str);
}
g_slist_free_full (g_steal_pointer (&uris), (GDestroyNotify)g_uri_unref);
}
}
int
main (int argc,
char *argv[])
{
SoupServer *server;
GMainLoop *main_loop;
GError *error = NULL;
dex_init ();
main_loop = g_main_loop_new (NULL, FALSE);
server = soup_server_new ("server-header", "libdex-httpd",
NULL);
soup_server_add_handler (server, "/", handle_message, NULL, NULL);
if (!soup_server_listen_all (server, 8080, 0, &error))
g_error ("%s", error->message);
print_uris (server);
g_main_loop_run (main_loop);
g_main_loop_unref (main_loop);
g_object_unref (server);
return EXIT_SUCCESS;
}
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