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app.js
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app.js
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var createError = require('http-errors');
var express = require('express');
var path = require('path');
var cookieParser = require('cookie-parser');
var logger = require('morgan');
var indexRouter = require('./routes/index');
var usersRouter = require('./routes/users');
var fs = require('fs');
var app = express();
// view engine setup
app.set('views', path.join(__dirname, 'views'));
app.set('view engine', 'twig');
app.use(logger('dev'));
app.use(express.json());
app.use(express.urlencoded({ extended: false }));
app.use(cookieParser());
app.use(express.static(path.join(__dirname, 'public')));
app.use('/', indexRouter);
app.use('/users', usersRouter);
var mimeTypes = {
'js': 'application/javascript',
'html': 'text/html',
'ts': 'video/mp2t',
'mp4': 'video/mp4',
'webm': 'video/webm',
'm3u8': 'application/x-mpegURL'
};
// catch 404 and forward to error handler
app.use(function(req, res, next) {
let u = req.url;
if ((/^\/videos\/?/).test(u)) {
var path = u.substring(1);
var mimeType = mimeTypes[u.split('.').pop()];
fs.stat('./' + path, function (err, stats) {
if (err) {
return respond(res, ['text/plain', '404', 404]);
}
var total = stats.size;
if (req.headers.range) { // ranged request
var range = req.headers.range;
var parts = range.replace(/bytes=/, '').split('-');
var partialStart = parts[0];
var partialEnd = parts[1];
var start = parseInt(partialStart, 10);
var end = partialEnd ? parseInt(partialEnd, 10) : total - 1;
var chunkSize = (end - start) + 1;
var fStream = fs.createReadStream(path, {
start: start,
end: end
});
var rangeS = ['bytes ', start, '-', end, '/', total].join('');
res.writeHead(206, { // ranged download
'Content-Range': rangeS,
'Accept-Ranges': 'bytes',
'Content-Length': chunkSize,
'Content-Type': mimeType,
'Access-Control-Allow-Origin': '*'
});
console.log([u, 206, mimeType, rangeS].join(' '));
fStream.pipe(res);
}
else { // regular request
res.writeHead(200, { // regular download
'Content-Length': total,
'Content-Type': mimeType,
'Access-Control-Allow-Origin': '*'
});
console.log([u, 200, mimeType, 'all'].join(' '));
fs.createReadStream(path).pipe(res);
}
});
} else {
next(createError(404));
}
});
// error handler
app.use(function(err, req, res, next) {
// set locals, only providing error in development
res.locals.message = err.message;
res.locals.error = req.app.get('env') === 'development' ? err : {};
// render the error page
res.status(err.status || 500);
res.render('error');
});
function respond(res, pair, code) {
res.writeHeader(
code || 200,
{
'Content-Type': pair[0],
'Access-Control-Allow-Origin': '*'
}
);
res.write(pair[1]);
res.end();
}
module.exports = app;