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index.js
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//
// Serves the LEDs on a REST interface plus SOSA data.
//
// Author: kaefer3000
//
// Import the interface to Tessel hardware
var tessel = require('tessel');
// Load the web framework
var express = require('express');
// Load the logger for the web framework
var logger = require('morgan');
// Load some parsers for HTTP message bodys
var bodyParser = require('body-parser');
// Load RDF
var rdf = require('rdf-ext')
// Load the RDF parsers for HTTP messages
var rdfBodyParser = require('rdf-body-parser');
var RdfXmlSerializer = require('rdf-serializer-rdfxml');
// The root app
app = express();
// Preparing to use my rdf/xml serialiser
var formatparams = {};
formatparams.serializers = new rdf.Serializers();
formatparams.serializers['application/rdf+xml'] = RdfXmlSerializer;
var formats = require('rdf-formats-common')(formatparams);
var configuredBodyParser = rdfBodyParser({'defaultMediaType' : 'text/turtle', 'formats' : formats});
app.use(configuredBodyParser);
// The two routers for the sensors/actuators
var ledApp = express.Router({ 'strict' : true });
ledApp.use(configuredBodyParser);
// configuring the app
app.set('json spaces', 2);
app.set('case sensitive routing', true);
app.set('strict routing', true);
app.use(logger('dev'));
// defining a utility method that redirects (301) missing trailing slashes
var redirectMissingTrailingSlash = function(request, response, next) {
if (!request.originalUrl.endsWith('/'))
response.redirect(301, request.originalUrl + '/');
else
next();
};
// wiring the apps and routers
app.use("/leds", ledApp);
// description of the root app
var rootRdfGraph = rdf.createGraph();
rootRdfGraph.addAll(
[
new rdf.Triple(
new rdf.NamedNode('#tessel2'),
new rdf.NamedNode('http://www.w3.org/1999/02/22-rdf-syntax-ns#type'),
new rdf.NamedNode('http://www.w3.org/ns/sosa/Platform')),
new rdf.Triple(
new rdf.NamedNode('#tessel2'),
new rdf.NamedNode('http://xmlns.com/foaf/0.1/isPrimaryTopicOf'),
new rdf.NamedNode('')),
new rdf.Triple(
new rdf.NamedNode('#tessel2'),
new rdf.NamedNode('http://www.w3.org/ns/sosa/hosts'),
new rdf.NamedNode('leds/#bar')),
new rdf.Triple(
new rdf.NamedNode('#tessel2'),
new rdf.NamedNode('http://www.w3.org/ns/sosa/hosts'),
new rdf.NamedNode('leds/systems/#sensact'))
])
app.all('/', redirectMissingTrailingSlash);
app.get('/', function(request, response) {
response.sendGraph(rootRdfGraph);
});
// description of the the leds
var ledRootGraph = rdf.createGraph();
ledRootGraph.addAll(
[
new rdf.Triple(
new rdf.NamedNode('#bar'),
new rdf.NamedNode('http://www.w3.org/1999/02/22-rdf-syntax-ns#type'),
new rdf.NamedNode('http://www.w3.org/ns/sosa/Platform')),
new rdf.Triple(
new rdf.NamedNode('#bar'),
new rdf.NamedNode('http://xmlns.com/foaf/0.1/isPrimaryTopicOf'),
new rdf.NamedNode('')),
new rdf.Triple(
new rdf.NamedNode('#bar'),
new rdf.NamedNode('http://www.w3.org/ns/sosa/hosts'),
new rdf.NamedNode('0#led')),
new rdf.Triple(
new rdf.NamedNode('#bar'),
new rdf.NamedNode('http://www.w3.org/ns/sosa/hosts'),
new rdf.NamedNode('1#led')),
new rdf.Triple(
new rdf.NamedNode('#bar'),
new rdf.NamedNode('http://www.w3.org/ns/sosa/hosts'),
new rdf.NamedNode('2#led')),
new rdf.Triple(
new rdf.NamedNode('#bar'),
new rdf.NamedNode('http://www.w3.org/ns/sosa/hosts'),
new rdf.NamedNode('3#led'))
])
ledApp.route('/')
.all(redirectMissingTrailingSlash)
.get(function(request, response) {
response.sendGraph(ledRootGraph);
})
.delete(function(request, response){
for (i = 0; i <= 3; i++) {
tessel.led[i].off();
}
response.sendStatus(204);
});
// GETting the state of one led
var ledBasicGraph = rdf.createGraph();
ledBasicGraph.addAll(
[
new rdf.Triple(
new rdf.NamedNode('#led'),
new rdf.NamedNode('http://www.w3.org/1999/02/22-rdf-syntax-ns#type'),
new rdf.NamedNode('https://w3id.org/saref#LightingDevice')),
new rdf.Triple(
new rdf.NamedNode('#led'),
new rdf.NamedNode('http://xmlns.com/foaf/0.1/isPrimaryTopicOf'),
new rdf.NamedNode('')),
new rdf.Triple(
new rdf.NamedNode('#led'),
new rdf.NamedNode('http://www.w3.org/ns/ssn/hasProperty'),
new rdf.NamedNode('#light')),
new rdf.Triple(
new rdf.NamedNode('#light'),
new rdf.NamedNode('http://www.w3.org/1999/02/22-rdf-syntax-ns#type'),
new rdf.NamedNode('http://www.w3.org/ns/sosa/ActuatableProperty')),
new rdf.Triple(
new rdf.NamedNode('#light'),
new rdf.NamedNode('http://www.w3.org/1999/02/22-rdf-syntax-ns#type'),
new rdf.NamedNode('http://www.w3.org/ns/sosa/ObservableProperty'))
])
var onTriple = new rdf.Triple(
new rdf.NamedNode('#light'),
new rdf.NamedNode('http://www.w3.org/1999/02/22-rdf-syntax-ns#value'),
new rdf.NamedNode('https://w3id.org/saref#On'));
var offTriple = new rdf.Triple(
new rdf.NamedNode('#light'),
new rdf.NamedNode('http://www.w3.org/1999/02/22-rdf-syntax-ns#value'),
new rdf.NamedNode('https://w3id.org/saref#Off'));
var ledGraphOn = ledBasicGraph.merge([onTriple]);
var ledGraphOff = ledBasicGraph.merge([offTriple]);
ledApp.route("/:id").get(function(request, response) {
var id = Number(request.params.id);
if (0 <= id && id <= 3) {
var statetriple;
if (tessel.led[id].isOn)
response.sendGraph(
ledGraphOn.merge(
[
new rdf.Triple(
new rdf.NamedNode('#light'),
new rdf.NamedNode('http://www.w3.org/ns/sosa/isObservedBy'),
new rdf.NamedNode('systems/sensors/' + id + '#it')),
new rdf.Triple(
new rdf.NamedNode('#light'),
new rdf.NamedNode('http://www.w3.org/ns/sosa/isActedOnBy'),
new rdf.NamedNode('systems/actuators/' + id + '#it'))
]
)
);
else
response.sendGraph(
ledGraphOff.merge(
[
new rdf.Triple(
new rdf.NamedNode('#light'),
new rdf.NamedNode('http://www.w3.org/ns/sosa/isObservedBy'),
new rdf.NamedNode('systems/sensors/' + id + '#it')),
new rdf.Triple(
new rdf.NamedNode('#light'),
new rdf.NamedNode('http://www.w3.org/ns/sosa/isActedOnBy'),
new rdf.NamedNode('systems/actuators/' + id + '#it'))
]
)
);
} else {
response.sendStatus(404);
}
});
// PUTting the state of one led
ledApp.route("/:id").put(function(request, response) {
id = Number(request.params.id);
if (0 <= id && id <= 3) {
var targetStateTripleCount = 0;
var statetriple;
request.graph.filter(
function(triple) {
return triple.predicate.nominalValue === 'http://www.w3.org/1999/02/22-rdf-syntax-ns#value'
}).forEach(function(triple) {
++targetStateTripleCount;
statetriple = triple;
})
if (targetStateTripleCount === 0 || targetStateTripleCount > 1) {
response.status(400);
response.send('Please supply exactly one triple with desired state\n');
return;
}
var targetState;
if (statetriple.object.interfaceName === 'NamedNode') {
switch (statetriple.object.nominalValue) {
case "https://w3id.org/saref#On":
targetState = true;
break;
case "https://w3id.org/saref#Off":
targetState = false;
break;
default:
response.status(400);
response.send('Please supply a triple with saref:hasState as predicate and saref:Off or saref:On as object\n');
return;
}
} else {
response.status(400);
response.send('Please supply a triple with saref:hasState as predicate and saref:Off or saref:On as object\n');
return;
}
if (typeof targetState !== "boolean") {
response.sendStatus(500);
} else if (targetState !== tessel.led[id].isOn) {
if (targetState === true)
tessel.led[id].on();
else
tessel.led[id].off();
response.sendStatus(204);
return;
}
response.sendStatus(204);
return;
} else {
response.sendStatus(404);
return;
}
});
var systemsgraph = rdf.createGraph();
systemsgraph.addAll(
[
new rdf.Triple(
new rdf.NamedNode('#senseact'),
new rdf.NamedNode('http://www.w3.org/1999/02/22-rdf-syntax-ns#type'),
new rdf.NamedNode('http://www.w3.org/ns/sosa/Platform')),
new rdf.Triple(
new rdf.NamedNode('#senseact'),
new rdf.NamedNode('http://xmlns.com/foaf/0.1/isPrimaryTopicOf'),
new rdf.NamedNode(''))
]
);
for (i = 0 ; i <= 3 ; i++) {
systemsgraph.addAll(
[
new rdf.Triple(
new rdf.NamedNode('#senseact'),
new rdf.NamedNode('http://www.w3.org/ns/sosa/hosts'),
new rdf.NamedNode('actuators/'+i+'#it')),
new rdf.Triple(
new rdf.NamedNode('#senseact'),
new rdf.NamedNode('http://www.w3.org/ns/sosa/hosts'),
new rdf.NamedNode('sensors/'+i+'#it'))
]);
}
ledApp.route('/systems/').get(function(req, res) {
res.sendGraph(systemsgraph);
});
var sensorActuatorBaseGraph = rdf.createGraph();
sensorActuatorBaseGraph.addAll(
[
new rdf.Triple(
new rdf.NamedNode('#it'),
new rdf.NamedNode('http://xmlns.com/foaf/0.1/isPrimaryTopicOf'),
new rdf.NamedNode('')),
new rdf.Triple(
new rdf.NamedNode('#it'),
new rdf.NamedNode('http://www.w3.org/ns/ssn/implements'),
new rdf.NamedNode('#procedure')),
new rdf.Triple(
new rdf.NamedNode('#procedure'),
new rdf.NamedNode('http://www.w3.org/1999/02/22-rdf-syntax-ns#type'),
new rdf.NamedNode('http://www.w3.org/ns/sosa/Procedure')),
new rdf.Triple(
new rdf.NamedNode('#procedure'),
new rdf.NamedNode('http://www.w3.org/1999/02/22-rdf-syntax-ns#type'),
new rdf.NamedNode('http://www.w3.org/2011/http#Request'))
]
);
var actuatorBaseGraph = sensorActuatorBaseGraph.merge(
[
new rdf.Triple(
new rdf.NamedNode('#procedure'),
new rdf.NamedNode('http://www.w3.org/2011/http#mthd'),
new rdf.NamedNode('http://www.w3.org/2011/http-methods#PUT')),
new rdf.Triple(
new rdf.NamedNode('#it'),
new rdf.NamedNode('http://www.w3.org/1999/02/22-rdf-syntax-ns#type'),
new rdf.NamedNode('http://www.w3.org/ns/sosa/Actuator')),
new rdf.Triple(
new rdf.NamedNode('#it'),
new rdf.NamedNode('http://www.w3.org/1999/02/22-rdf-syntax-ns#type'),
new rdf.NamedNode('https://w3id.org/saref#OnOffFunction'))
]
);
var sensorBaseGraph = sensorActuatorBaseGraph.merge(
[
new rdf.Triple(
new rdf.NamedNode('#procedure'),
new rdf.NamedNode('http://www.w3.org/2011/http#mthd'),
new rdf.NamedNode('http://www.w3.org/2011/http-methods#GET')),
new rdf.Triple(
new rdf.NamedNode('#it'),
new rdf.NamedNode('http://www.w3.org/1999/02/22-rdf-syntax-ns#type'),
new rdf.NamedNode('http://www.w3.org/ns/sosa/Sensor'))
]
);
ledApp.route('/systems/actuators/:id').get(function(req, res) {
var id = Number(req.params.id);
if (id < 0 || id > 3) { res.sendStatus(404); } ;
res.sendGraph(actuatorBaseGraph.merge(
[
new rdf.Triple(
new rdf.NamedNode('#it'),
new rdf.NamedNode('http://www.w3.org/ns/ssn/forProperty'),
new rdf.NamedNode('../../leds/'+req.params.id+'#state')),
new rdf.Triple(
new rdf.NamedNode('#procedure'),
new rdf.NamedNode('http://www.w3.org/2011/http#requestURI'),
new rdf.Literal('../../leds/'+req.params.id, null, new rdf.NamedNode('http://www.w3.org/2001/XMLSchema#anyURI')))
]
));
});
ledApp.route('/systems/sensors/:id').get(function(req, res) {
var id = Number(req.params.id);
if (id < 0 || id > 3) { res.sendStatus(404); } ;
res.sendGraph(sensorBaseGraph.merge(
[
new rdf.Triple(
new rdf.NamedNode('#it'),
new rdf.NamedNode('http://www.w3.org/ns/sosa/observes'),
new rdf.NamedNode('../../leds/'+req.params.id+'#state')),
new rdf.Triple(
new rdf.NamedNode('#procedure'),
new rdf.NamedNode('http://www.w3.org/2011/http#requestURI'),
new rdf.Literal('../../leds/'+req.params.id, null, new rdf.NamedNode('http://www.w3.org/2001/XMLSchema#anyURI')))
]
));
});
var obsGraphBase = rdf.createGraph();
var obsGraphBnode = new rdf.BlankNode();
obsGraphBase.addAll(
[
new rdf.Triple(
obsGraphBnode,
new rdf.NamedNode('http://www.w3.org/1999/02/22-rdf-syntax-ns#type'),
new rdf.NamedNode('http://www.w3.org/ns/sosa/Observation')),
new rdf.Triple(
obsGraphBnode,
new rdf.NamedNode('http://www.w3.org/ns/sosa/madeBySensor'),
new rdf.NamedNode('#it')),
new rdf.Triple(
new rdf.NamedNode('#it'),
new rdf.NamedNode('http://www.w3.org/1999/02/22-rdf-syntax-ns#type'),
new rdf.NamedNode('http://www.w3.org/ns/sosa/Sensor'))
]
);
ledApp.route('/systems/sensors/:id').post(function(req, res) {
var id = Number(req.params.id);
if (id < 0 || id > 3) { res.sendStatus(404); } ;
var retGraph = obsGraphBase.merge(
[
new rdf.Triple(
obsGraphBnode,
new rdf.NamedNode('http://www.w3.org/ns/sosa/hasFeatureOfInterest'),
new rdf.NamedNode('../../leds/'+req.params.id+'#led')),
new rdf.Triple(
new rdf.NamedNode('#it'),
new rdf.NamedNode('http://www.w3.org/ns/sosa/observes'),
new rdf.NamedNode('../../leds/'+req.params.id+'#state'))
]
);
if (tessel.led[id].isOn)
retGraph.addAll(
[
new rdf.Triple(
obsGraphBnode,
new rdf.NamedNode('http://www.w3.org/ns/sosa/hasSimpleResult'),
new rdf.NamedNode('https://w3id.org/saref#On'))
]);
else
retGraph.addAll(
[
new rdf.Triple(
obsGraphBnode,
new rdf.NamedNode('http://www.w3.org/ns/sosa/hasSimpleResult'),
new rdf.NamedNode('https://w3id.org/saref#Off'))
]);
res.sendGraph(retGraph);
});
var actGraphBase = rdf.createGraph();
var actGraphBnode = new rdf.BlankNode();
actGraphBase.addAll(
[
new rdf.Triple(
actGraphBnode,
new rdf.NamedNode('http://www.w3.org/1999/02/22-rdf-syntax-ns#type'),
new rdf.NamedNode('http://www.w3.org/ns/sosa/Actuation')),
new rdf.Triple(
actGraphBnode,
new rdf.NamedNode('http://www.w3.org/ns/sosa/madeByActuator'),
new rdf.NamedNode('#it')),
new rdf.Triple(
new rdf.NamedNode('#it'),
new rdf.NamedNode('http://www.w3.org/1999/02/22-rdf-syntax-ns#type'),
new rdf.NamedNode('http://www.w3.org/ns/sosa/Actuator'))
]
);
ledApp.route('/systems/actuators/:id').post(function(req, res) {
var id = Number(req.params.id);
if (id < 0 || id > 3) { res.sendStatus(404); } ;
var retGraph = actGraphBase.merge(
[
new rdf.Triple(
actGraphBnode,
new rdf.NamedNode('http://www.w3.org/ns/sosa/hasFeatureOfInterest'),
new rdf.NamedNode('../../leds/'+req.params.id+'#led')),
new rdf.Triple(
new rdf.NamedNode('#it'),
new rdf.NamedNode('http://www.w3.org/ns/ssn/forProperty'),
new rdf.NamedNode('../../leds/'+req.params.id+'#state'))
]
);
if (tessel.led[id].isOn) {
tessel.led[id].off();
retGraph.addAll(
[
new rdf.Triple(
actGraphBnode,
new rdf.NamedNode('http://www.w3.org/ns/sosa/hasSimpleResult'),
new rdf.NamedNode('https://w3id.org/saref#Off'))
]);
} else {
tessel.led[id].on();
retGraph.addAll(
[
new rdf.Triple(
actGraphBnode,
new rdf.NamedNode('http://www.w3.org/ns/sosa/hasSimpleResult'),
new rdf.NamedNode('https://w3id.org/saref#On'))
]);
}
res.sendGraph(retGraph);
});
// Startup the server
var port = 80;
app.listen(port, function () {
console.log('Tessel2 LED REST app listening on port ' + port);
});
// For finding the server in the network, some handy output on the console
console.log(require('os').networkInterfaces());