--- /dev/null
+/*
+ This file is part of GNUnet.
+ Copyright (C) 2012-2015 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/>.
+ */
+/**
+ * @author Martin Schanzenbach
+ * @author Philippe Buschmann
+ * @file peerinfo/plugin_rest_peerinfo.c
+ * @brief GNUnet Peerinfo REST plugin
+ */
+
+#include "platform.h"
+#include "gnunet_rest_plugin.h"
+#include "gnunet_peerinfo_service.h"
+#include "gnunet_transport_service.h"
+#include "gnunet_rest_lib.h"
+#include "gnunet_json_lib.h"
+#include "microhttpd.h"
+#include <jansson.h>
+
+#define GNUNET_REST_API_NS_PEERINFO "/peerinfo"
+#define GNUNET_REST_API_PEERINFO_PEER "peer"
+#define GNUNET_REST_API_PEERINFO_FRIEND "friend"
+
+//TODO define other variables
+#define GNUNET_REST_ERROR_UNKNOWN "Unkown Error"
+
+/**
+ * The configuration handle
+ */
+const struct GNUNET_CONFIGURATION_Handle *cfg;
+
+/**
+ * HTTP methods allows for this plugin
+ */
+static char* allow_methods;
+
+/**
+ * @brief struct returned by the initialization function of the plugin
+ */
+struct Plugin
+{
+ const struct GNUNET_CONFIGURATION_Handle *cfg;
+};
+
+//TODO add specific structs
+
+
+
+struct RequestHandle
+{
+ //TODO add specific entries
+ json_t *temp_array;
+ char *expiration_str;
+ const char *address;
+
+ /**
+ * Iteration peer public key
+ */
+ char *pubkey;
+
+ /**
+ * JSON array response
+ */
+ json_t *response;
+
+ /**
+ * Handle to PEERINFO it
+ */
+ struct GNUNET_PEERINFO_IteratorContext *list_it;
+
+ /**
+ * Handle to PEERINFO
+ */
+ struct GNUNET_PEERINFO_Handle *peerinfo_handle;
+
+ /**
+ * Rest connection
+ */
+ struct GNUNET_REST_RequestHandle *rest_handle;
+
+ /**
+ * Desired timeout for the lookup (default is no timeout).
+ */
+ struct GNUNET_TIME_Relative timeout;
+
+ /**
+ * ID of a task associated with the resolution process.
+ */
+ struct GNUNET_SCHEDULER_Task *timeout_task;
+
+ /**
+ * The plugin result processor
+ */
+ GNUNET_REST_ResultProcessor proc;
+
+ /**
+ * The closure of the result processor
+ */
+ void *proc_cls;
+
+ /**
+ * The url
+ */
+ char *url;
+
+ /**
+ * Error response message
+ */
+ char *emsg;
+
+ /**
+ * Reponse code
+ */
+ int response_code;
+
+};
+
+
+/**
+ * Cleanup lookup handle
+ * @param handle Handle to clean up
+ */
+static void
+cleanup_handle (void *cls)
+{
+ struct RequestHandle *handle = cls;
+
+ GNUNET_log (GNUNET_ERROR_TYPE_ERROR, "Test: %i\n", NULL == handle);
+
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "Cleaning up\n");
+ if (NULL != handle->timeout_task)
+ {
+ GNUNET_SCHEDULER_cancel (handle->timeout_task);
+ handle->timeout_task = NULL;
+ }
+ if (NULL != handle->url)
+ GNUNET_free (handle->url);
+ if (NULL != handle->emsg)
+ GNUNET_free (handle->emsg);
+
+ if (NULL != handle->response)
+ {
+ json_decref(handle->response);
+ handle->response = NULL;
+ }
+
+ if (NULL != handle->list_it)
+ {
+ GNUNET_PEERINFO_iterate_cancel(handle->list_it);
+ handle->list_it = NULL;
+ }
+
+ if (NULL != handle->peerinfo_handle)
+ {
+ GNUNET_PEERINFO_disconnect(handle->peerinfo_handle);
+ handle->peerinfo_handle = NULL;
+ }
+
+ //TODO add specific cleanup
+
+ GNUNET_free (handle);
+}
+
+
+/**
+ * Task run on errors. Reports an error and cleans up everything.
+ *
+ * @param cls the `struct RequestHandle`
+ */
+static void
+do_error (void *cls)
+{
+ struct RequestHandle *handle = cls;
+ struct MHD_Response *resp;
+ json_t *json_error = json_object();
+ char *response;
+
+ if (NULL == handle->emsg)
+ handle->emsg = GNUNET_strdup(GNUNET_REST_ERROR_UNKNOWN);
+
+ json_object_set_new(json_error,"error", json_string(handle->emsg));
+
+ if (0 == handle->response_code)
+ handle->response_code = MHD_HTTP_OK;
+ response = json_dumps (json_error, 0);
+ resp = GNUNET_REST_create_response (response);
+ handle->proc (handle->proc_cls, resp, handle->response_code);
+ json_decref(json_error);
+ GNUNET_free(response);
+ GNUNET_SCHEDULER_add_now (&cleanup_handle, handle);
+}
+
+
+/**
+ * Function that assembles our response.
+ */
+static void
+peerinfo_list_finished (void *cls)
+{
+ GNUNET_log (GNUNET_ERROR_TYPE_ERROR, "6\n");
+ struct RequestHandle *handle = cls;
+ char *result_str;
+ struct MHD_Response *resp;
+
+ if (NULL == handle->response)
+ {
+ handle->emsg = GNUNET_strdup ("No peers found");
+ GNUNET_SCHEDULER_add_now (&do_error, handle);
+ return;
+ }
+
+ result_str = json_dumps (handle->response, 0);
+ GNUNET_log(GNUNET_ERROR_TYPE_DEBUG, "Result %s\n", result_str);
+ resp = GNUNET_REST_create_response (result_str);
+ handle->proc (handle->proc_cls, resp, MHD_HTTP_OK);
+ GNUNET_free_non_null (result_str);
+ GNUNET_SCHEDULER_add_now (&cleanup_handle, handle);
+}
+
+
+/**
+ * Set @a cls to #GNUNET_YES (we have an address!).
+ *
+ * @param cls closure, an `int *`
+ * @param address the address (ignored)
+ * @param expiration expiration time (call is ignored if this is in the past)
+ * @return #GNUNET_SYSERR to stop iterating (unless expiration has occured)
+ */
+static int
+check_has_addr (void *cls,
+ const struct GNUNET_HELLO_Address *address,
+ struct GNUNET_TIME_Absolute expiration)
+{
+ int *arg = cls;
+ if (0 == GNUNET_TIME_absolute_get_remaining (expiration).rel_value_us)
+ {
+ return GNUNET_YES; /* ignore this address */
+ }
+ *arg = GNUNET_YES;
+ return GNUNET_SYSERR;
+}
+
+static void
+create_array(void *cls)
+{
+ struct RequestHandle *handle = cls;
+// json_t *object;
+// object = json_object();
+//
+// json_object_set(object,"address",json_string(handle->address));
+// json_object_set(object,"expires",json_string(handle->expiration_str));
+//
+// if(NULL == handle->temp_array)
+// {
+// handle->temp_array = json_array();
+// }
+//
+// json_array_append(handle->temp_array,object);
+//
+// json_decref(object);
+ GNUNET_log (GNUNET_ERROR_TYPE_ERROR, "5\n");
+ json_object_set(handle->response, handle->pubkey, handle->temp_array);
+ json_decref (handle->temp_array);
+}
+
+static void
+create_tmp_array (void *cls)
+{
+ struct RequestHandle *handle = cls;
+ GNUNET_log (GNUNET_ERROR_TYPE_ERROR, "4\n");
+ json_t *object;
+ json_t *address_json = json_string (handle->address);
+ json_t *expires_json = json_string (handle->expiration_str);
+ object = json_object ();
+
+ json_object_set (object, "address", address_json);
+ json_decref(address_json);
+ json_object_set (object, "expires", expires_json);
+ json_decref(expires_json);
+ GNUNET_free(handle->expiration_str);
+
+ if (NULL == handle->temp_array)
+ {
+ handle->temp_array = json_array ();
+ }
+
+ json_array_append (handle->temp_array, object);
+
+ json_decref (object);
+}
+
+static void
+addr_to_str_cb (void *cls,
+ const char *address,
+ int res)
+{
+ struct RequestHandle *handle = cls;
+ if (NULL == address)
+ {
+ return;
+ }
+ if (GNUNET_OK != res)
+ {
+ return;
+ }
+ GNUNET_log (GNUNET_ERROR_TYPE_ERROR, "3\n");
+ handle->address = GNUNET_strdup(address);
+ GNUNET_assert(false);
+}
+
+/**
+ * Set @a cls to #GNUNET_YES (we have an address!).
+ *
+ * @param cls closure
+ * @param address the address (ignored)
+ * @param expiration expiration time (call is ignored if this is in the past)
+ * @return #GNUNET_SYSERR to stop iterating (unless expiration has occured)
+ */
+static int
+address_iteration (void *cls,
+ const struct GNUNET_HELLO_Address *address,
+ struct GNUNET_TIME_Absolute expiration)
+{
+ struct RequestHandle *handle = cls;
+ char *expiration_tmp;
+
+ if (0 == GNUNET_TIME_absolute_get_remaining (expiration).rel_value_us)
+ {
+ return GNUNET_YES; /* ignore this address */
+ }
+ expiration_tmp = GNUNET_STRINGS_absolute_time_to_string(expiration);
+ handle->expiration_str = GNUNET_strdup(expiration_tmp);
+ GNUNET_log (GNUNET_ERROR_TYPE_ERROR, "2\n");
+ GNUNET_TRANSPORT_address_to_string(cfg,
+ address,
+ GNUNET_NO,
+ GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_SECONDS, 10),
+ &addr_to_str_cb,
+ handle);
+
+ GNUNET_SCHEDULER_add_now(&create_tmp_array,handle);
+
+// GNUNET_SCHEDULER_add_delayed (
+// GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_SECONDS, 11),
+// &create_array,
+// handle);
+ return GNUNET_YES;
+}
+
+
+/**
+ * Callback that processes each of the known HELLOs for the
+ * iteration response construction.
+ *
+ * @param cls closure, NULL
+ * @param peer id of the peer, NULL for last call
+ * @param hello hello message for the peer (can be NULL)
+ * @param err_msg message
+ */
+void
+peerinfo_list_iteration(void *cls,
+ const struct GNUNET_PeerIdentity *peer,
+ const struct GNUNET_HELLO_Message *hello,
+ const char *err_msg)
+{
+ struct RequestHandle *handle = cls;
+ int has_addr;
+
+ if (NULL == handle->response)
+ {
+ handle->response = json_object();
+ }
+
+ if (NULL != err_msg)
+ {
+ GNUNET_assert (NULL == peer);
+ handle->list_it = NULL;
+ handle->emsg = GNUNET_strdup ("Error in communication with peerinfo");
+ handle->response_code = MHD_HTTP_INTERNAL_SERVER_ERROR;
+ GNUNET_SCHEDULER_add_now (&do_error, handle);
+ return;
+ }
+ if (NULL == peer)
+ {
+ handle->list_it = NULL;
+ GNUNET_SCHEDULER_add_now (&peerinfo_list_finished, handle);
+ return;
+ }
+ if (NULL == hello)
+ return;
+ has_addr = GNUNET_NO;
+ GNUNET_HELLO_iterate_addresses (hello,
+ GNUNET_NO,
+ &check_has_addr,
+ &has_addr);
+ if (GNUNET_NO == has_addr)
+ {
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "HELLO for peer `%4s' has no address, not suitable for hostlist!\n",
+ GNUNET_i2s (peer));
+ return;
+ }
+
+ if (NULL != handle->pubkey)
+ GNUNET_free (handle->pubkey);
+ handle->pubkey = GNUNET_CRYPTO_eddsa_public_key_to_string(&peer->public_key);
+ GNUNET_log (GNUNET_ERROR_TYPE_ERROR, "1\n");
+ GNUNET_HELLO_iterate_addresses (hello,
+ GNUNET_NO,
+ &address_iteration,
+ handle);
+ GNUNET_SCHEDULER_add_now(&create_array,handle);
+}
+
+/**
+ * Handle peerinfo GET request
+ *
+ * @param con_handle the connection handle
+ * @param url the url
+ * @param cls the RequestHandle
+ */
+void
+peerinfo_get (struct GNUNET_REST_RequestHandle *con_handle,
+ const char* url,
+ void *cls)
+{
+ struct RequestHandle *handle = cls;
+ struct GNUNET_HashCode key;
+ const struct GNUNET_PeerIdentity *specific_peer;
+ GNUNET_PEER_Id peer_id;
+ int include_friend_only;
+
+ include_friend_only = GNUNET_NO;
+ GNUNET_CRYPTO_hash (GNUNET_REST_API_PEERINFO_FRIEND,
+ strlen (GNUNET_REST_API_PEERINFO_FRIEND),
+ &key);
+ if ( GNUNET_YES
+ == GNUNET_CONTAINER_multihashmap_contains (con_handle->url_param_map,
+ &key))
+ {
+ include_friend_only = *(int*)GNUNET_CONTAINER_multihashmap_get (
+ con_handle->url_param_map, &key);
+ }
+ if(GNUNET_YES != include_friend_only)
+ {
+ include_friend_only = GNUNET_NO;
+ }
+
+ specific_peer = NULL;
+ GNUNET_CRYPTO_hash (GNUNET_REST_API_PEERINFO_PEER,
+ strlen (GNUNET_REST_API_PEERINFO_PEER),
+ &key);
+ if ( GNUNET_YES
+ == GNUNET_CONTAINER_multihashmap_contains (con_handle->url_param_map,
+ &key))
+ {
+ peer_id = *(unsigned int*)GNUNET_CONTAINER_multihashmap_get (con_handle->url_param_map, &key);
+ specific_peer = GNUNET_PEER_resolve2(peer_id);
+ }
+
+
+ //TODO friend_only and special peer
+
+ //TODO add behaviour and response
+ //TODO maybe notify better than iteration
+
+ handle->list_it = GNUNET_PEERINFO_iterate(handle->peerinfo_handle,
+ include_friend_only,
+ specific_peer,
+ &peerinfo_list_iteration,
+ handle);
+}
+
+
+
+/**
+ * Respond to OPTIONS request
+ *
+ * @param con_handle the connection handle
+ * @param url the url
+ * @param cls the RequestHandle
+ */
+static void
+options_cont (struct GNUNET_REST_RequestHandle *con_handle,
+ const char* url,
+ void *cls)
+{
+ struct MHD_Response *resp;
+ struct RequestHandle *handle = cls;
+
+ //independent of path return all options
+ resp = GNUNET_REST_create_response (NULL);
+ MHD_add_response_header (resp,
+ "Access-Control-Allow-Methods",
+ allow_methods);
+ handle->proc (handle->proc_cls, resp, MHD_HTTP_OK);
+ GNUNET_SCHEDULER_add_now (&cleanup_handle, handle);
+ return;
+}
+
+
+/**
+ * Handle rest request
+ *
+ * @param handle the request handle
+ */
+static void
+init_cont (struct RequestHandle *handle)
+{
+ //TODO specify parameter of init_cont if necessary
+ struct GNUNET_REST_RequestHandlerError err;
+ static const struct GNUNET_REST_RequestHandler handlers[] = {
+ {MHD_HTTP_METHOD_GET, GNUNET_REST_API_NS_PEERINFO, &peerinfo_get},
+ {MHD_HTTP_METHOD_OPTIONS, GNUNET_REST_API_NS_PEERINFO, &options_cont},
+ GNUNET_REST_HANDLER_END
+ };
+
+ if (GNUNET_NO == GNUNET_REST_handle_request (handle->rest_handle,
+ handlers,
+ &err,
+ handle))
+ {
+ handle->response_code = err.error_code;
+ GNUNET_SCHEDULER_add_now (&do_error, 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 callback function
+ * @return GNUNET_OK if request accepted
+ */
+static void
+rest_process_request(struct GNUNET_REST_RequestHandle *rest_handle,
+ GNUNET_REST_ResultProcessor proc,
+ void *proc_cls)
+{
+ struct RequestHandle *handle = GNUNET_new (struct RequestHandle);
+
+ handle->response_code = 0;
+ handle->timeout = GNUNET_TIME_UNIT_FOREVER_REL;
+ handle->proc_cls = proc_cls;
+ handle->proc = proc;
+ handle->rest_handle = rest_handle;
+
+ handle->url = GNUNET_strdup (rest_handle->url);
+ if (handle->url[strlen (handle->url)-1] == '/')
+ handle->url[strlen (handle->url)-1] = '\0';
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Connecting...\n");
+ //TODO connect to specific service
+ //connect ( cfg, [..., &callback_function, handle]);
+ handle->peerinfo_handle = GNUNET_PEERINFO_connect(cfg);
+ init_cont(handle);
+ handle->timeout_task =
+ GNUNET_SCHEDULER_add_delayed (handle->timeout,
+ &do_error,
+ handle);
+
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Connected\n");
+}
+
+
+/**
+ * Entry point for the plugin.
+ *
+ * @param cls Config info
+ * @return NULL on error, otherwise the plugin context
+ */
+void *
+libgnunet_plugin_rest_peerinfo_init (void *cls)
+{
+ static struct Plugin plugin;
+ struct GNUNET_REST_Plugin *api;
+
+ cfg = cls;
+ 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_PEERINFO;
+ api->process_request = &rest_process_request;
+ GNUNET_asprintf (&allow_methods,
+ "%s, %s, %s, %s, %s",
+ MHD_HTTP_METHOD_GET,
+ MHD_HTTP_METHOD_POST,
+ MHD_HTTP_METHOD_PUT,
+ MHD_HTTP_METHOD_DELETE,
+ MHD_HTTP_METHOD_OPTIONS);
+
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ _("Peerinfo 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_peerinfo_done (void *cls)
+{
+ struct GNUNET_REST_Plugin *api = cls;
+ struct Plugin *plugin = api->cls;
+ plugin->cfg = NULL;
+
+ GNUNET_free_non_null (allow_methods);
+ GNUNET_free (api);
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "Peerinfo REST plugin is finished\n");
+ return NULL;
+}
+
+/* end of plugin_rest_peerinfo.c */
+
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