app_srfp.js
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var express = require('express');
var path = require('path');
var favicon = require('serve-favicon');
var logger = require('morgan');
var cookieParser = require('cookie-parser');
var bodyParser = require('body-parser');
var index = require('./routes/index');
var users = require('./routes/users');
var app = express();
var fs = require('fs');
var util = require('util');
var crypto = require('crypto');
var http = require("http");
var url = require("url");
app.listen(3000, function () {
console.log('Example app listening on port 3000!')
});
/*const now=(unit)=>{
const hrTime=process.hrtime();
switch (unit) {
case 'milli':return hrTime[0] * 1000 + hrTime[1] / 1000000;
case 'micro':return hrTime[0] * 1000000 + hrTime[1] / 1000;
case 'nano':return hrTime[0] * 1000000000 + hrTime[1] ;
break;
default:return hrTime[0] * 1000000000 + hrTime[1] ;
}
}*/
app.get('/multiMedia.json',function (req, res) {
var name = req.query.name;
var type = req.query.type;
var commadId = req.query.commandId;
var pathfile = null;
if (type === 'audio') {
pathfile = './audio/' + name;
} else if (type === 'video') {
pathfile = './video/' + name;
} else if (type === 'image') {
pathfile = 'D:\\PROJECT@AIS\\SRFP_Node\\Genesis-SRFP\\public\\image\\' + name;
} else {
console.log('Access Denied');
}
// if (type === 'audio') {
// pathfile = path.join('D:', 'Node','Audio' , name);
// } else if (type === 'video') {
// pathfile = path.join('D:', 'Node','Video' , name);
// } else if (type === 'image') {
// pathfile = path.join('D:', 'Node','Image' , name);
// } else {
// console.log('Access Denied');
// }
var file = fs.readFileSync(pathfile);
var value = Buffer.from(file).toString('base64');
var stats = fs.statSync(pathfile);
var mtime = stats.mtime;
var size = stats.size;
console.log(mtime.toISOString().replace(/T/, ' ').replace(/\..+/, ''));
// console.log(mtime.getTime());
// Get the if-modified-since header from the request
var reqModDate = req.headers['if-modified-since'];
// console.log('If-modify ' + new Date(reqModDate).toISOString().replace(/T/, ' ').replace(/\..+/, ''));
if (reqModDate != null) {
reqModDate = new Date(reqModDate);
if (reqModDate.getTime() == mtime.getTime()) {
console.log("load from cache");
res.writeHead(304, {
"Last-Modified": mtime.toUTCString()
});
res.end();
} else {
console.log("no cache");
var fileName = "test.jpg";
res.download(pathfile, fileName);
res.end();
}
} else {
res.writeHead(304, {
"Last-Modified": mtime.toUTCString()
});
res.end();
}
// res.send(value.toString());
});