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/*
* Copyright (C) 2015 "IoT.bzh"
* Author "Fulup Ar Foll"
*
* 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 3 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, see <http://www.gnu.org/licenses/>.
*
* Contain all generic part to handle REST/API
*/
#include <microhttpd.h>
#include <sys/stat.h>
#include "../include/local-def.h"
// proto missing from GCC
char *strcasestr(const char *haystack, const char *needle);
// Because of POST call multiple time requestApi we need to free POST handle here
STATIC void endRequest(void *cls, struct MHD_Connection *connection, void **con_cls, enum MHD_RequestTerminationCode toe) {
AFB_HttpPost *posthandle = *con_cls;
// if post handle was used let's free everything
if (posthandle) {
if (verbose) fprintf(stderr, "End Post Request UID=%d\n", posthandle->uid);
free(posthandle->data);
free(posthandle);
}
}
PUBLIC json_object* pingSample (AFB_plugin *plugin, AFB_session *session, AFB_request *post) {
static pingcount=0;
json_object *response;
response = jsonNewMessage(AFB_SUCCESS, "Ping Binder Daemon %d", pingcount++);
if (verbose) fprintf(stderr, "%d: \n", pingcount);
return (response);
}
// Check of apiurl is declare in this plugin and call it
STATIC json_object * callPluginApi (AFB_plugin *plugin, AFB_session *session, AFB_request *request) {
json_object *response;
int idx;
// If a plugin hold this urlpath call its callback
for (idx=0; plugin->apis[idx].callback != NULL; idx++) {
if (!strcmp (plugin->apis[idx].name, request->api)) {
response = plugin->apis[idx].callback (session, request);
if (response != NULL) {
json_object_object_add (response, "jtype" ,plugin->jtype);
}
return (response);
}
}
return (NULL);
}
// process rest API query
PUBLIC int doRestApi(struct MHD_Connection *connection, AFB_session *session, const char *method, const char* url) {
char *baseurl, *baseapi, *urlcpy;
json_object *jsonResponse, *errMessage;
struct MHD_Response *webResponse;
const char *serialized, parsedurl;
AFB_request request;
int idx, ret;
// Extract plugin urlpath from request
urlcpy=strdup (url);
baseurl = strsep(&urlcpy, "/");
if (baseurl == NULL) {
errMessage = jsonNewMessage(AFB_FATAL, "Invalid Plugin/API call url=%s", url);
goto ExitOnError;
}
baseapi = strsep(&urlcpy, "/");
if (baseapi == NULL) {
errMessage = jsonNewMessage(AFB_FATAL, "Invalid Plugin/API call url=%s/%s", baseurl, url);
goto ExitOnError;
}
// build request structure
memset (&request, 0, sizeof (request));
request.connection = connection;
request.url = url;
request.plugin = baseurl;
request.api = baseapi;
// if post wait as data may come in multiple calls
if (0 == strcmp (method, MHD_HTTP_METHOD_POST)) {
request.post="TO Be DONE";
} else {
request.post=NULL;
};
// Search for a plugin with this urlpath
for (idx=0; session->plugins[idx] != NULL; idx++) {
if (!strcmp (session->plugins[idx]->prefix, baseurl)) {
jsonResponse = callPluginApi (session->plugins[idx], session, &request );
free (urlcpy);
break;
}
errMessage = jsonNewMessage(AFB_FATAL, "No Plugin for %s", baseurl);
free (urlcpy);
goto ExitOnError;
}
// plugin callback did not return a valid Json Object
if (jsonResponse == NULL) {
errMessage = jsonNewMessage(AFB_FATAL, "No Plugin/API for %s/%s", baseurl, baseapi);
goto ExitOnError;
}
serialized = json_object_to_json_string(jsonResponse);
webResponse = MHD_create_response_from_buffer(strlen(serialized), (void*) serialized, MHD_RESPMEM_MUST_COPY);
ret = MHD_queue_response(connection, MHD_HTTP_OK, webResponse);
MHD_destroy_response(webResponse);
json_object_put(jsonResponse); // decrease reference rqtcount to free the json object
return ret;
ExitOnError:
serialized = json_object_to_json_string(errMessage);
webResponse = MHD_create_response_from_buffer(strlen(serialized), (void*) serialized, MHD_RESPMEM_MUST_COPY);
ret = MHD_queue_response(connection, MHD_HTTP_BAD_REQUEST, webResponse);
MHD_destroy_response(webResponse);
json_object_put(errMessage); // decrease reference rqtcount to free the json object
return ret;
}
// Helper to retreive argument from connection
PUBLIC const char* getQueryValue (AFB_request * request, char *name) {
const char *value;
value=MHD_lookup_connection_value(request->connection, MHD_GET_ARGUMENT_KIND, name);
return (value);
}
void *initPlugins (AFB_session *session) {
static AFB_plugin *plugins[10]; // no more than 10 plugins !!!
AFB_plugin *plugin;
int idx;
// simulate dynamic library load for plugins
// need to implement mods argument to activate only requested mods
idx=0;
// Minimal check before accepting a new plugin
plugin = afsvRegister (session);
if (plugin->type != AFB_PLUGIN) {
fprintf (stderr, "ERROR: AFSV plugin invalid type=%d!=%d\n", plugin->type, AFB_PLUGIN);
} else {
// Prepare Plugin name to be added to API response
plugin->jtype = json_object_new_string (plugin->prefix);
json_object_get (plugin->jtype); // increase reference count to make it permanent
plugins[idx++]= plugin;
}
session->plugins= plugins;
}
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