--- /dev/null
+// NavdbUriHandler.cxx -- Access the nav database
+//
+// Written by Torsten Dreyer, started April 2014.
+//
+// Copyright (C) 2014 Torsten Dreyer
+//
+// 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 2 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, write to the Free Software
+// Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+
+#include "NavdbUriHandler.hxx"
+#include <simgear/debug/logstream.hxx>
+#include <Navaids/positioned.hxx>
+#include <3rdparty/cjson/cJSON.h>
+#include <boost/lexical_cast.hpp>
+
+using std::string;
+
+namespace flightgear {
+namespace http {
+
+//Ref: http://geojson.org/
+
+static cJSON * createGeometryFor(FGPositionedRef positioned)
+{
+ // for now, we are lazy - everything is just a point.
+
+ cJSON * geometry = cJSON_CreateObject();
+ cJSON_AddItemToObject(geometry, "type", cJSON_CreateString("Point"));
+
+ cJSON * coordinates = cJSON_CreateArray();
+ cJSON_AddItemToObject(geometry, "coordinates", coordinates);
+
+ cJSON_AddItemToArray(coordinates, cJSON_CreateNumber(positioned->longitude()));
+ cJSON_AddItemToArray(coordinates, cJSON_CreateNumber(positioned->latitude()));
+
+ return geometry;
+}
+
+static cJSON * createPropertiesFor(FGPositionedRef positioned)
+{
+ cJSON * properties = cJSON_CreateObject();
+
+ cJSON_AddItemToObject(properties, "name", cJSON_CreateString(positioned->name().c_str()));
+ cJSON_AddItemToObject(properties, "type", cJSON_CreateString(positioned->typeString()));
+ cJSON_AddItemToObject(properties, "elevation-m", cJSON_CreateNumber(positioned->elevationM()));
+ return properties;
+}
+
+static cJSON * createFeatureFor(FGPositionedRef positioned)
+{
+ cJSON * feature = cJSON_CreateObject();
+
+ // A GeoJSON object with the type "Feature" is a feature object.
+ cJSON_AddItemToObject(feature, "type", cJSON_CreateString("Feature"));
+
+ // A feature object must have a member with the name "geometry".
+ // The value of the geometry member is a geometry object as defined above or a JSON null value.
+ cJSON_AddItemToObject(feature, "geometry", createGeometryFor(positioned));
+
+ // A feature object must have a member with the name "properties".
+ // The value of the properties member is an object (any JSON object or a JSON null value).
+ cJSON_AddItemToObject(feature, "properties", createPropertiesFor(positioned));
+
+ // If a feature has a commonly used identifier, that identifier should be included
+ // as a member of the feature object with the name "id".
+ cJSON_AddItemToObject(feature, "id", cJSON_CreateString(positioned->ident().c_str()));
+
+ return feature;
+}
+
+bool NavdbUriHandler::handleRequest(const HTTPRequest & request, HTTPResponse & response)
+{
+ response.Header["Content-Type"] = "application/json; charset=UTF-8";
+
+ bool indent = request.RequestVariables.get("i") == "y";
+ string query = request.RequestVariables.get("q");
+ FGPositionedList result;
+
+ if (query == "findWithinRange") {
+ // ?q=findWithinRange&lat=53.5&lon=10.0&range=100&type=vor,ils
+
+ double lat, lon, range = -1;
+ try {
+ lat = boost::lexical_cast<double>(request.RequestVariables.get("lat"));
+ lon = boost::lexical_cast<double>(request.RequestVariables.get("lon"));
+ range = boost::lexical_cast<double>(request.RequestVariables.get("range"));
+ }
+ catch (...) {
+ goto fail;
+ }
+
+ if (range <= 1.0) goto fail;
+ // In remembrance of a famous bug
+
+ SGGeod pos = SGGeod::fromDeg(lon, lat);
+ FGPositioned::TypeFilter filter;
+ try {
+ filter = FGPositioned::TypeFilter::fromString(request.RequestVariables.get("type"));
+ }
+ catch (...) {
+ goto fail;
+ }
+
+ result = FGPositioned::findWithinRange(pos, range, &filter);
+ } else {
+ goto fail;
+ }
+
+ { // create some GeoJSON from the result list
+ // GeoJSON always consists of a single object.
+ cJSON * geoJSON = cJSON_CreateObject();
+
+ // The GeoJSON object must have a member with the name "type".
+ // This member's value is a string that determines the type of the GeoJSON object.
+ cJSON_AddItemToObject(geoJSON, "type", cJSON_CreateString("FeatureCollection"));
+
+ // A GeoJSON object with the type "FeatureCollection" is a feature collection object.
+ // An object of type "FeatureCollection" must have a member with the name "features".
+ // The value corresponding to "features" is an array.
+ cJSON * featureCollection = cJSON_CreateArray();
+ cJSON_AddItemToObject(geoJSON, "features", featureCollection);
+
+ for (FGPositionedList::iterator it = result.begin(); it != result.end(); ++it) {
+ // Each element in the array is a feature object as defined above.
+ cJSON_AddItemToArray(featureCollection, createFeatureFor(*it));
+ }
+
+ char * jsonString = indent ? cJSON_Print(geoJSON) : cJSON_PrintUnformatted(geoJSON);
+ cJSON_Delete(geoJSON);
+ response.Content = jsonString;
+ free(jsonString);
+ }
+
+ return true;
+
+ fail: response.StatusCode = 400;
+ response.Content = "{ 'error': 'bad request' }";
+ return true;
+}
+
+} // namespace http
+} // namespace flightgear
+
--- /dev/null
+// NavdbUriHandler.hxx -- Access the nav database
+//
+// Written by Torsten Dreyer, started April 2014.
+//
+// Copyright (C) 2014 Torsten Dreyer
+//
+// 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 2 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, write to the Free Software
+// Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+
+#ifndef __FG_NAVDB_URI_HANDLER_HXX
+#define __FG_NAVDB_URI_HANDLER_HXX
+
+#include "urihandler.hxx"
+
+namespace flightgear {
+namespace http {
+
+class NavdbUriHandler : public URIHandler {
+public:
+ NavdbUriHandler( const char * uri = "/navdb" ) : URIHandler( uri ) {}
+ virtual bool handleRequest( const HTTPRequest & request, HTTPResponse & response );
+};
+
+} // namespace http
+} // namespace flightgear
+
+#endif //#define __FG_NAVDB_URI_HANDLER_HXX
projects / flightgear.git / commitdiff