312 lines
12 KiB
C++
312 lines
12 KiB
C++
// NavdbUriHandler.cxx -- Access the nav database
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//
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// Written by Torsten Dreyer, started April 2014.
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//
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// Copyright (C) 2014 Torsten Dreyer
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//
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// This program is free software; you can redistribute it and/or
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// modify it under the terms of the GNU General Public License as
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// published by the Free Software Foundation; either version 2 of the
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// License, or (at your option) any later version.
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//
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// This program is distributed in the hope that it will be useful, but
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// WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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// General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with this program; if not, write to the Free Software
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// Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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#include "NavdbUriHandler.hxx"
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#include <simgear/debug/logstream.hxx>
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#include <Navaids/navrecord.hxx>
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#include <Airports/airport.hxx>
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#include <3rdparty/cjson/cJSON.h>
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#include <boost/lexical_cast.hpp>
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using std::string;
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namespace flightgear {
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namespace http {
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static cJSON * createPositionArray(double x, double y)
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{
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cJSON * p = cJSON_CreateArray();
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cJSON_AddItemToArray(p, cJSON_CreateNumber(x));
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cJSON_AddItemToArray(p, cJSON_CreateNumber(y));
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return p;
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}
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static cJSON * createLOCGeometry(FGNavRecord * navRecord)
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{
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assert( navRecord != NULL );
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cJSON * geometry = cJSON_CreateObject();
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int range = navRecord->get_range();
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double width = navRecord->localizerWidth();
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double course = navRecord->get_multiuse();
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double px[4];
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double py[4];
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px[0] = navRecord->longitude();
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py[0] = navRecord->latitude();
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for (int i = -1; i <= +1; i++) {
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double c = SGMiscd::normalizeAngle((course + 180 + i * width / 2) * SG_DEGREES_TO_RADIANS);
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SGGeoc geoc = SGGeoc::fromGeod(navRecord->geod());
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SGGeod p2 = SGGeod::fromGeoc(geoc.advanceRadM(c, range * SG_NM_TO_METER));
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px[i + 2] = p2.getLongitudeDeg();
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py[i + 2] = p2.getLatitudeDeg();
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}
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// Add three lines: centerline, left and right edge
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cJSON_AddItemToObject(geometry, "type", cJSON_CreateString("MultiLineString"));
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cJSON * coordinates = cJSON_CreateArray();
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cJSON_AddItemToObject(geometry, "coordinates", coordinates);
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for (int i = 1; i < 4; i++) {
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cJSON * line = cJSON_CreateArray();
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cJSON_AddItemToArray(coordinates, line);
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cJSON_AddItemToArray(line, createPositionArray(px[0], py[0]));
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cJSON_AddItemToArray(line, createPositionArray(px[i], py[i]));
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}
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return geometry;
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}
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static cJSON * createPointGeometry(FGPositionedRef positioned )
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{
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cJSON * geometry = cJSON_CreateObject();
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cJSON_AddItemToObject(geometry, "type", cJSON_CreateString("Point"));
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cJSON_AddItemToObject(geometry, "coordinates", createPositionArray(positioned ->longitude(), positioned->latitude()));
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return geometry;
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}
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static cJSON * createAirportGeometry(FGAirport * airport )
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{
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assert( airport != NULL );
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FGRunwayList runways = airport->getRunwaysWithoutReciprocals();
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if( runways.empty() ) {
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// no runways? Create a Point geometry
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return createPointGeometry( airport );
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}
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cJSON * geometry = cJSON_CreateObject();
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// if there are runways, create a geometry collection
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cJSON_AddItemToObject(geometry, "type", cJSON_CreateString("GeometryCollection"));
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cJSON * geometryCollection = cJSON_CreateArray();
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cJSON_AddItemToObject(geometry, "geometries", geometryCollection);
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// the first item is the aerodrome reference point
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cJSON_AddItemToArray( geometryCollection, createPointGeometry(airport) );
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// followed by the runway polygons
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for( FGRunwayList::iterator it = runways.begin(); it != runways.end(); ++it ) {
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cJSON * polygon = cJSON_CreateObject();
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cJSON_AddItemToArray( geometryCollection, polygon );
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cJSON_AddItemToObject(polygon, "type", cJSON_CreateString("Polygon"));
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cJSON * coordinates = cJSON_CreateArray();
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cJSON_AddItemToObject(polygon, "coordinates", coordinates );
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cJSON * linearRing = cJSON_CreateArray();
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cJSON_AddItemToArray( coordinates, linearRing );
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// compute the four corners of the runway
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SGGeod p1 = (*it)->pointOffCenterline( 0.0, (*it)->widthM()/2 );
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SGGeod p2 = (*it)->pointOffCenterline( 0.0, -(*it)->widthM()/2 );
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SGGeod p3 = (*it)->pointOffCenterline( (*it)->lengthM(), -(*it)->widthM()/2 );
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SGGeod p4 = (*it)->pointOffCenterline( (*it)->lengthM(), (*it)->widthM()/2 );
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cJSON_AddItemToArray( linearRing, createPositionArray(p1.getLongitudeDeg(), p1.getLatitudeDeg()) );
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cJSON_AddItemToArray( linearRing, createPositionArray(p2.getLongitudeDeg(), p2.getLatitudeDeg()) );
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cJSON_AddItemToArray( linearRing, createPositionArray(p3.getLongitudeDeg(), p3.getLatitudeDeg()) );
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cJSON_AddItemToArray( linearRing, createPositionArray(p4.getLongitudeDeg(), p4.getLatitudeDeg()) );
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// close the ring
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cJSON_AddItemToArray( linearRing, createPositionArray(p1.getLongitudeDeg(), p1.getLatitudeDeg()) );
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}
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return geometry;
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}
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static cJSON * createGeometryFor(FGPositionedRef positioned)
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{
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switch( positioned->type() ) {
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case FGPositioned::LOC:
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case FGPositioned::ILS:
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return createLOCGeometry( dynamic_cast<FGNavRecord*>(positioned.get()) );
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case FGPositioned::AIRPORT:
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return createAirportGeometry( dynamic_cast<FGAirport*>(positioned.get()) );
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default:
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return createPointGeometry( positioned );
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}
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}
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static void addAirportProperties(cJSON * json, FGAirport * airport )
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{
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if( NULL == airport ) return;
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FGRunwayList runways = airport->getRunwaysWithoutReciprocals();
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double longestRunwayLength = 0.0;
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double longestRunwayHeading = 0.0;
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const char * longestRunwaySurface = "";
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for( FGRunwayList::iterator it = runways.begin(); it != runways.end(); ++it ) {
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FGRunwayRef runway = *it;
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if( runway->lengthM() > longestRunwayLength ) {
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longestRunwayLength = runway->lengthM();
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longestRunwayHeading = runway->headingDeg();
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longestRunwaySurface = runway->surfaceName();
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}
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}
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cJSON_AddItemToObject(json, "longestRwyLength_m", cJSON_CreateNumber(longestRunwayLength));
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cJSON_AddItemToObject(json, "longestRwyHeading_deg", cJSON_CreateNumber(longestRunwayHeading));
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cJSON_AddItemToObject(json, "longestRwySurface", cJSON_CreateString(longestRunwaySurface));
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}
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static void addNAVProperties(cJSON * json, FGNavRecord * navRecord )
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{
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if( NULL == navRecord ) return;
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cJSON_AddItemToObject(json, "range_nm", cJSON_CreateNumber(navRecord->get_range()));
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cJSON_AddItemToObject(json, "frequency", cJSON_CreateNumber((double) navRecord->get_freq() / 100.0));
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switch (navRecord->type()) {
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case FGPositioned::ILS:
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case FGPositioned::LOC:
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cJSON_AddItemToObject(json, "localizer-course", cJSON_CreateNumber(navRecord->get_multiuse()));
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break;
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case FGPositioned::VOR:
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cJSON_AddItemToObject(json, "variation", cJSON_CreateNumber(navRecord->get_multiuse()));
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break;
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default:
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break;
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}
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}
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static cJSON * createPropertiesFor(FGPositionedRef positioned)
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{
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cJSON * properties = cJSON_CreateObject();
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cJSON_AddItemToObject(properties, "name", cJSON_CreateString(positioned->name().c_str()));
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// also add id to properties
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cJSON_AddItemToObject(properties, "id", cJSON_CreateString(positioned->ident().c_str()));
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cJSON_AddItemToObject(properties, "type", cJSON_CreateString(positioned->typeString()));
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cJSON_AddItemToObject(properties, "elevation-m", cJSON_CreateNumber(positioned->elevationM()));
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addNAVProperties( properties, dynamic_cast<FGNavRecord*>(positioned.get()) );
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addAirportProperties( properties, dynamic_cast<FGAirport*>(positioned.get()) );
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return properties;
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}
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static cJSON * createFeatureFor(FGPositionedRef positioned)
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{
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cJSON * feature = cJSON_CreateObject();
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// A GeoJSON object with the type "Feature" is a feature object.
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cJSON_AddItemToObject(feature, "type", cJSON_CreateString("Feature"));
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// A feature object must have a member with the name "geometry".
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// The value of the geometry member is a geometry object as defined above or a JSON null value.
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cJSON_AddItemToObject(feature, "geometry", createGeometryFor(positioned));
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// A feature object must have a member with the name "properties".
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// The value of the properties member is an object (any JSON object or a JSON null value).
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cJSON_AddItemToObject(feature, "properties", createPropertiesFor(positioned));
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// If a feature has a commonly used identifier, that identifier should be included
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// as a member of the feature object with the name "id".
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cJSON_AddItemToObject(feature, "id", cJSON_CreateString(positioned->ident().c_str()));
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return feature;
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}
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bool NavdbUriHandler::handleRequest(const HTTPRequest & request, HTTPResponse & response, Connection * connection)
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{
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response.Header["Content-Type"] = "application/json; charset=UTF-8";
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response.Header["Access-Control-Allow-Origin"] = "*";
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response.Header["Access-Control-Allow-Methods"] = "OPTIONS, GET";
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response.Header["Access-Control-Allow-Headers"] = "Origin, Accept, Content-Type, X-Requested-With, X-CSRF-Token";
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if( request.Method == "OPTIONS" ){
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return true; // OPTIONS only needs the headers
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}
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if( request.Method != "GET" ){
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response.Header["Allow"] = "OPTIONS, GET";
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response.StatusCode = 405;
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response.Content = "{}";
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return true;
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}
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bool indent = request.RequestVariables.get("i") == "y";
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string query = request.RequestVariables.get("q");
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FGPositionedList result;
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if (query == "findWithinRange") {
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// ?q=findWithinRange&lat=53.5&lon=10.0&range=100&type=vor,ils
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double lat, lon, range = -1;
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try {
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lat = boost::lexical_cast<double>(request.RequestVariables.get("lat"));
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lon = boost::lexical_cast<double>(request.RequestVariables.get("lon"));
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range = boost::lexical_cast<double>(request.RequestVariables.get("range"));
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}
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catch (...) {
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goto fail;
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}
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if (range <= 1.0) goto fail;
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// In remembrance of a famous bug
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SGGeod pos = SGGeod::fromDeg(lon, lat);
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FGPositioned::TypeFilter filter;
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try {
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filter = FGPositioned::TypeFilter::fromString(request.RequestVariables.get("type"));
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}
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catch (...) {
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goto fail;
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}
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result = FGPositioned::findWithinRange(pos, range, &filter);
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} else {
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goto fail;
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}
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{ // create some GeoJSON from the result list
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// GeoJSON always consists of a single object.
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cJSON * geoJSON = cJSON_CreateObject();
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// The GeoJSON object must have a member with the name "type".
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// This member's value is a string that determines the type of the GeoJSON object.
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cJSON_AddItemToObject(geoJSON, "type", cJSON_CreateString("FeatureCollection"));
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// we send zero to many features - let's make it a FeatureCollection
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// A GeoJSON object with the type "FeatureCollection" is a feature collection object.
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// An object of type "FeatureCollection" must have a member with the name "features".
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// The value corresponding to "features" is an array.
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cJSON * featureCollection = cJSON_CreateArray();
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cJSON_AddItemToObject(geoJSON, "features", featureCollection);
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for (FGPositionedList::iterator it = result.begin(); it != result.end(); ++it) {
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// Each element in the array is a feature object as defined above.
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cJSON_AddItemToArray(featureCollection, createFeatureFor(*it));
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}
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char * jsonString = indent ? cJSON_Print(geoJSON) : cJSON_PrintUnformatted(geoJSON);
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cJSON_Delete(geoJSON);
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response.Content = jsonString;
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free(jsonString);
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}
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return true;
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fail: response.StatusCode = 400;
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response.Content = "{ 'error': 'bad request' }";
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return true;
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}
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} // namespace http
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} // namespace flightgear
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