REST: add config plugin

2 files changed, 301 insertions, 2 deletions

diff --git a/src/rest/Makefile.am b/src/rest/Makefile.am
index acb95140b..8fe48198f 100644
--- a/src/rest/Makefile.am
+++ b/src/rest/Makefile.am
@@ -23,9 +23,11 @@ lib_LTLIBRARIES = \
   libgnunetrest.la 
 
 libexec_PROGRAMS = \
- gnunet-rest-server
+  gnunet-rest-server
 
-plugin_LTLIBRARIES = libgnunet_plugin_rest_copying.la 
+plugin_LTLIBRARIES = \
+  libgnunet_plugin_rest_copying.la \
+  libgnunet_plugin_rest_config.la
 
 EXTRA_DIST = \
  rest.conf
@@ -39,6 +41,15 @@ libgnunet_plugin_rest_copying_la_LIBADD = \
 libgnunet_plugin_rest_copying_la_LDFLAGS = \
  $(GN_PLUGIN_LDFLAGS)
 
+libgnunet_plugin_rest_config_la_SOURCES = \
+  plugin_rest_config.c
+libgnunet_plugin_rest_config_la_LIBADD = \
+  libgnunetrest.la \
+  $(top_builddir)/src/util/libgnunetutil.la $(XLIBS) \
+  $(LTLIBINTL) -lmicrohttpd -ljansson
+libgnunet_plugin_rest_config_la_LDFLAGS = \
+ $(GN_PLUGIN_LDFLAGS)
+
 
 
 gnunet_rest_server_SOURCES = \
diff --git a/src/rest/plugin_rest_config.c b/src/rest/plugin_rest_config.c
new file mode 100644
index 000000000..fe8d9bf7f
--- /dev/null
+++ b/src/rest/plugin_rest_config.c
@@ -0,0 +1,288 @@
+/*
+   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 */