recordaudio/server.js at master · HongkunGe/recordaudio · GitHub

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
#!/bin/env node

'use strict';

var express = require('express');
var fs      = require('fs');
var bodyParser = require('body-parser');
var qs = require('querystring');
var request = require('request');
var config = require('./ibmWatson.json');

/**
 *  Define the sample application.
 */
var SampleApp = function() {

    //  Scope.
    var self = this;


    /*  ================================================================  */
    /*  Helper functions.                                                 */
    /*  ================================================================  */

    /**
     *  Set up server IP address and port # using env variables/defaults.
     */
    self.setupVariables = function() {
        //  Set the environment variables we need.
        self.ipaddress = process.env.OPENSHIFT_NODEJS_IP;
        self.port      = process.env.OPENSHIFT_NODEJS_PORT || 8080;

        if (typeof self.ipaddress === "undefined") {
            //  Log errors on OpenShift but continue w/ 127.0.0.1 - this
            //  allows us to run/test the app locally.
            console.warn('No OPENSHIFT_NODEJS_IP var, using 127.0.0.1');
            self.ipaddress = "127.0.0.1";
        };
    };


    /**
     *  Populate the cache.
     */
    self.populateCache = function() {
        if (typeof self.zcache === "undefined") {
            self.zcache = { 'index.html': '' };
        }

        //  Local cache for static content.
        self.zcache['index.html'] = fs.readFileSync('./public/index.html');
        self.zcache['freq.html'] = fs.readFileSync('./public/freq.html');
    };


    /**
     *  Retrieve entry (content) from cache.
     *  @param {string} key  Key identifying content to retrieve from cache.
     */
    self.cache_get = function(key) { return self.zcache[key]; };


    /**
     *  terminator === the termination handler
     *  Terminate server on receipt of the specified signal.
     *  @param {string} sig  Signal to terminate on.
     */
    self.terminator = function(sig){
        if (typeof sig === "string") {
           console.log('%s: Received %s - terminating sample app ...',
                       Date(Date.now()), sig);
           process.exit(1);
        }
        console.log('%s: Node server stopped.', Date(Date.now()) );
    };


    /**
     *  Setup termination handlers (for exit and a list of signals).
     */
    self.setupTerminationHandlers = function(){
        //  Process on exit and signals.
        process.on('exit', function() { self.terminator(); });

        // Removed 'SIGPIPE' from the list - bugz 852598.
        ['SIGHUP', 'SIGINT', 'SIGQUIT', 'SIGILL', 'SIGTRAP', 'SIGABRT',
         'SIGBUS', 'SIGFPE', 'SIGUSR1', 'SIGSEGV', 'SIGUSR2', 'SIGTERM'
        ].forEach(function(element, index, array) {
            process.on(element, function() { self.terminator(element); });
        });
    };


    /*  ================================================================  */
    /*  App server functions (main app logic here).                       */
    /*  ================================================================  */

    /**
     *  Create the routing table entries + handlers for the application.
     */
    self.createRoutes = function() {
        self.routes = { };

        self.routes['/asciimo'] = function(req, res) {
            var link = "http://i.imgur.com/kmbjB.png";
            res.send("<html><body><img src='" + link + "'></body></html>");
        };

        self.routes['/freq'] = function(req, res) {
            res.setHeader('Content-Type', 'text/html');
            res.send(self.cache_get('freq.html') );
        };

        self.routes['/'] = function(req, res) {
            res.setHeader('Content-Type', 'text/html');
            res.send(self.cache_get('index.html') );
        };
    };


    /**
     *  Initialize the server (express) and create the routes and register
     *  the handlers.
     */
    self.initializeServer = function() {
        self.createRoutes();
        self.app = express();

        // Enable reverse proxy support in Express. This causes the
        // the "X-Forwarded-Proto" header field to be trusted so its
        // value can be used to determine the protocol. See
        // http://expressjs.com/api#app-settings for more details.
        self.app.enable('trust proxy');

        // Add a handler to inspect the req.secure flag (see
        // http://expressjs.com/api#req.secure). This allows us
        // to know whether the request was via http or https.
        self.app.use (function (req, res, next) {
                if (req.secure) {
                        // request was via https, so do no special handling
                        next();
                } else {
                        // request was via http, so redirect to https
                        res.redirect('https://' + req.headers.host + req.url);
                }
        });

        // self.app.use(express.static(__dirname));
        //  Add handlers for the app (from the routes).
        for (var r in self.routes) {
            self.app.get(r, self.routes[r]);
        }
        ['css', 'img', 'js', 'decoration', 'plugin', 'lib'].forEach(function (dir){
            self.app.use('/'+ dir, express.static(__dirname+'/public/'+dir));
        });

        // TODO: Deploy API for IBM Watson Speech-to-text

        self.app.use(bodyParser.urlencoded({extended : true}));
        self.app.use(express.bodyParser());
        self.app.set('json spaces', 2);
        self.app.set('json replacer', null);

        // Test API
        self.app.use('/api', function(req, res){
            res.json({'message': 'Intelligibility API'});
        });

        self.app.get('/token', function(req, res){
            var token;

            var authTokenURL = 'https://stream.watsonplatform.net/authorization/api/v1/token';
            var url = 'https://stream.watsonplatform.net/speech-to-text/api/';

            var username = config['credentials']['username'];
            var password = config['credentials']['password'];

            authTokenURL = authTokenURL + '?' + 'url=' + url;

            var options = {
                'url': authTokenURL,
                'auth': {
                    'user': username,
                    'pass': password,
                    'sendImmediately': false
                }
            };

            request(options, function(err, resToken, body){
                if(!err && resToken.statusCode == 200){
                    res.json({'token': body});
                } else if( err ){
                    res.json({'Error occured': err});
                } else if( resToken.statusCode != 200 ){
                    res.json({'Error occured': resToken.statusCode});
                }
            });

        });

    };


    /**
     *  Initializes the sample application.
     */
    self.initialize = function() {
        self.setupVariables();
        self.populateCache();
        self.setupTerminationHandlers();

        // Create the express server and routes.
        self.initializeServer();
    };


    /**
     *  Start the server (starts up the sample application).
     */
    self.start = function() {
        //  Start the app on the specific interface (and port).
        self.app.listen(self.port, self.ipaddress, function() {
            console.log('%s: Node server started on %s:%d ...',
                        Date(Date.now() ), self.ipaddress, self.port);
        });
    };

};   /*  Sample Application.  */


/**
 *  main():  Main code.
 */
var zapp = new SampleApp();
zapp.initialize();
zapp.start();