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import 'dart:io';
/* A simple web server that responds to **ALL** GET requests by returning
* the contents of data.json file, and responds to ALL **POST** requests
* by overwriting the contents of the data.json file
*
* Browse to it using http://localhost:8080
*
* Provides CORS headers, so can be accessed from any other page
*/
final HOST = "127.0.0.1"; // eg: localhost
final PORT = 8080;
final DATA_FILE = "data.json";
void main() {
HttpServer.bind(HOST, PORT).then((server) {
server.listen((HttpRequest request) {
switch (request.method) {
case "GET":
handleGet(request);
break;
case "POST":
handlePost(request);
break;
case "OPTIONS":
handleOptions(request);
break;
default: defaultHandler(request);
}
},
onError: printError);
print("Listening for GET and POST on http://$HOST:$PORT");
},
onError: printError);
}
/**
* Handle GET requests by reading the contents of data.json
* and returning it to the client
*/
void handleGet(HttpRequest req) {
HttpResponse res = req.response;
print("${req.method}: ${req.uri.path}");
addCorsHeaders(res);
var file = new File(DATA_FILE);
if (file.existsSync()) {
res.headers.add(HttpHeaders.CONTENT_TYPE, "application/json");
file.readAsBytes().asStream().pipe(res); // automatically close output stream
}
else {
var err = "Could not find file: $DATA_FILE";
res.addString(err);
res.close();
}
}
/**
* Handle POST requests by overwriting the contents of data.json
* Return the same set of data back to the client.
*/
void handlePost(HttpRequest req) {
HttpResponse res = req.response;
print("${req.method}: ${req.uri.path}");
addCorsHeaders(res);
req.listen((List<int> buffer) {
var file = new File(DATA_FILE);
var ioSink = file.openWrite(); // save the data to the file
ioSink.add(buffer);
ioSink.close();
// return the same results back to the client
res.add(buffer);
res.close();
},
onError: printError);
}
/**
* Add Cross-site headers to enable accessing this server from pages
* not served by this server
*
* See: http://www.html5rocks.com/en/tutorials/cors/
* and http://enable-cors.org/server.html
*/
void addCorsHeaders(HttpResponse res) {
res.headers.add("Access-Control-Allow-Origin", "*");
res.headers.add("Access-Control-Allow-Methods", "POST, GET, OPTIONS");
res.headers.add("Access-Control-Allow-Headers", "Origin, X-Requested-With, Content-Type, Accept");
}
void handleOptions(HttpRequest req) {
HttpResponse res = req.response;
addCorsHeaders(res);
print("${req.method}: ${req.uri.path}");
res.statusCode = HttpStatus.NO_CONTENT;
res.close();
}
void defaultHandler(HttpRequest req) {
HttpResponse res = req.response;
addCorsHeaders(res);
res.statusCode = HttpStatus.NOT_FOUND;
res.addString("Not found: ${req.method}, ${req.uri.path}");
res.close();
}
void printError(error) => print(error);