--- /dev/null
+/*
+ This file is part of GNUnet.
+ Copyright (C) 2012-2018 GNUnet e.V.
+
+ GNUnet is free software: you can redistribute it and/or modify it
+ under the terms of the GNU Affero General Public License as published
+ by the Free Software Foundation, either version 3 of the License,
+ or (at your option) any later version.
+
+ GNUnet 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
+ Affero General Public License for more details.
+
+ You should have received a copy of the GNU Affero General Public License
+ along with this program. If not, see <http://www.gnu.org/licenses/>.
+
+ SPDX-License-Identifier: AGPL3.0-or-later
+ */
+/**
+ * @author Martin Schanzenbach
+ * @file gns/plugin_rest_config.c
+ * @brief REST plugin for configuration
+ *
+ */
+
+#include "platform.h"
+#include "gnunet_rest_plugin.h"
+#include <gnunet_rest_lib.h>
+#include <gnunet_util_lib.h>
+#include <jansson.h>
+
+#define GNUNET_REST_API_NS_CONFIG "/config"
+
+/**
+ * @brief struct returned by the initialization function of the plugin
+ */
+struct Plugin
+{
+ const struct GNUNET_CONFIGURATION_Handle *cfg;
+};
+
+const struct GNUNET_CONFIGURATION_Handle *cfg;
+
+struct RequestHandle
+{
+ /**
+ * Handle to rest request
+ */
+ struct GNUNET_REST_RequestHandle *rest_handle;
+
+ /**
+ * The plugin result processor
+ */
+ GNUNET_REST_ResultProcessor proc;
+
+ /**
+ * The closure of the result processor
+ */
+ void *proc_cls;
+
+ /**
+ * HTTP response code
+ */
+ int response_code;
+
+ /**
+ * The URL
+ */
+ char *url;
+};
+
+
+/**
+ * Cleanup request handle.
+ *
+ * @param handle Handle to clean up
+ */
+static void
+cleanup_handle (struct RequestHandle *handle)
+{
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Cleaning up\n");
+ if (NULL != handle->url)
+ GNUNET_free (handle->url);
+ GNUNET_free (handle);
+}
+
+
+/**
+ * Task run on shutdown. Cleans up everything.
+ *
+ * @param cls unused
+ * @param tc scheduler context
+ */
+static void
+do_error (void *cls)
+{
+ struct RequestHandle *handle = cls;
+ struct MHD_Response *resp;
+
+ resp = GNUNET_REST_create_response (NULL);
+ handle->proc (handle->proc_cls, resp, handle->response_code);
+ cleanup_handle (handle);
+}
+
+
+static void
+add_sections (void *cls,
+ const char *section,
+ const char *option,
+ const char *value)
+{
+ json_t *sections_obj = cls;
+ json_t *sec_obj;
+
+ sec_obj = json_object_get (sections_obj, section);
+ if (NULL != sec_obj)
+ {
+ json_object_set_new (sec_obj, option, json_string (value));
+ return;
+ }
+ sec_obj = json_object ();
+ json_object_set_new (sec_obj, option, json_string (value));
+ json_object_set_new (sections_obj, section, sec_obj);
+}
+
+static void
+add_section_contents (void *cls,
+ const char *section,
+ const char *option,
+ const char *value)
+{
+ json_t *section_obj = cls;
+ json_object_set_new (section_obj, option, json_string (value));
+}
+
+
+/**
+ * Handle rest request
+ *
+ * @param handle the lookup handle
+ */
+static void
+get_cont (struct GNUNET_REST_RequestHandle *con_handle,
+ const char *url,
+ void *cls)
+{
+ struct MHD_Response *resp;
+ struct RequestHandle *handle = cls;
+ const char *section;
+ char *response;
+ json_t *result;
+
+ if (strlen (GNUNET_REST_API_NS_CONFIG) > strlen (handle->url))
+ {
+ handle->response_code = MHD_HTTP_BAD_REQUEST;
+ GNUNET_SCHEDULER_add_now (&do_error, handle);
+ return;
+ }
+ if (strlen (GNUNET_REST_API_NS_CONFIG) == strlen (handle->url))
+ {
+ result = json_object ();
+ GNUNET_CONFIGURATION_iterate (cfg, &add_sections, result);
+ }
+ else
+ {
+ result = json_object ();
+ section = &handle->url[strlen (GNUNET_REST_API_NS_CONFIG) + 1];
+ GNUNET_CONFIGURATION_iterate_section_values (cfg,
+ section,
+ &add_section_contents,
+ result);
+ }
+ response = json_dumps (result, 0);
+ resp = GNUNET_REST_create_response (response);
+ handle->proc (handle->proc_cls, resp, MHD_HTTP_OK);
+ cleanup_handle (handle);
+ GNUNET_free (response);
+ json_decref (result);
+}
+
+
+/**
+ * Handle rest request
+ *
+ * @param handle the lookup handle
+ */
+static void
+options_cont (struct GNUNET_REST_RequestHandle *con_handle,
+ const char *url,
+ void *cls)
+{
+ struct MHD_Response *resp;
+ struct RequestHandle *handle = cls;
+
+ resp = GNUNET_REST_create_response (NULL);
+ MHD_add_response_header (resp,
+ "Access-Control-Allow-Methods",
+ MHD_HTTP_METHOD_GET);
+ handle->proc (handle->proc_cls, resp, MHD_HTTP_OK);
+ cleanup_handle (handle);
+}
+
+
+/**
+ * Function processing the REST call
+ *
+ * @param method HTTP method
+ * @param url URL of the HTTP request
+ * @param data body of the HTTP request (optional)
+ * @param data_size length of the body
+ * @param proc callback function for the result
+ * @param proc_cls closure for @a proc
+ * @return #GNUNET_OK if request accepted
+ */
+static void
+rest_config_process_request (struct GNUNET_REST_RequestHandle *conndata_handle,
+ GNUNET_REST_ResultProcessor proc,
+ void *proc_cls)
+{
+ static const struct GNUNET_REST_RequestHandler handlers[] = {
+ {MHD_HTTP_METHOD_GET, GNUNET_REST_API_NS_CONFIG, &get_cont},
+ {MHD_HTTP_METHOD_OPTIONS, GNUNET_REST_API_NS_CONFIG, &options_cont},
+ GNUNET_REST_HANDLER_END};
+ struct RequestHandle *handle = GNUNET_new (struct RequestHandle);
+ struct GNUNET_REST_RequestHandlerError err;
+
+ handle->proc_cls = proc_cls;
+ handle->proc = proc;
+ handle->rest_handle = conndata_handle;
+ handle->url = GNUNET_strdup (conndata_handle->url);
+ if (handle->url[strlen (handle->url) - 1] == '/')
+ handle->url[strlen (handle->url) - 1] = '\0';
+
+ if (GNUNET_NO ==
+ GNUNET_REST_handle_request (conndata_handle, handlers, &err, handle))
+ {
+ handle->response_code = err.error_code;
+ GNUNET_SCHEDULER_add_now (&do_error, handle);
+ }
+}
+
+
+/**
+ * Entry point for the plugin.
+ *
+ * @param cls the "struct GNUNET_NAMESTORE_PluginEnvironment*"
+ * @return NULL on error, otherwise the plugin context
+ */
+void *
+libgnunet_plugin_rest_config_init (void *cls)
+{
+ static struct Plugin plugin;
+ cfg = cls;
+ struct GNUNET_REST_Plugin *api;
+
+ if (NULL != plugin.cfg)
+ return NULL; /* can only initialize once! */
+ memset (&plugin, 0, sizeof (struct Plugin));
+ plugin.cfg = cfg;
+ api = GNUNET_new (struct GNUNET_REST_Plugin);
+ api->cls = &plugin;
+ api->name = GNUNET_REST_API_NS_CONFIG;
+ api->process_request = &rest_config_process_request;
+ GNUNET_log (GNUNET_ERROR_TYPE_INFO, _ ("CONFIG REST API initialized\n"));
+ return api;
+}
+
+
+/**
+ * Exit point from the plugin.
+ *
+ * @param cls the plugin context (as returned by "init")
+ * @return always NULL
+ */
+void *
+libgnunet_plugin_rest_config_done (void *cls)
+{
+ struct GNUNET_REST_Plugin *api = cls;
+ struct Plugin *plugin = api->cls;
+
+ plugin->cfg = NULL;
+ GNUNET_free (api);
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "CONFIG REST plugin is finished\n");
+ return NULL;
+}
+
+/* end of plugin_rest_config.c */
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