added oauth module

lib/server/auth.js

@@ -0,0 +1,84 @@
+/* https://github.com/prose/gatekeeper */
+
+var https           = require('https'),
+    fs              = require('fs'),
+    qs              = require('querystring'),
+    Config;
+
+exports.auth = function(pCode, pCallBack){
+    
+    fs.readFile(process.cwd() + 'tokens.json', function(pErr, pData){
+        pCode = pCode.replace('code=','');
+
+        console.log('d');
+        var TokensFile = {};
+        if(!pErr && pData){
+            TokensFile = JSON.parse(pData);
+        }
+        if( !TokensFile[pCode] )
+            readConfig(pCode, pCallBack);
+        else 
+            pCallBack();
+        
+        pCallBack();
+    });
+    
+};
+
+
+function readConfig(pCode, pCallBack){
+    Config = require(process.cwd() + '/auth');
+        
+    for (var i in Config)
+        Config[i] = process.env[i.toUpperCase()] || Config[i];
+    
+    console.log('Configuration');
+    console.log(Config);
+
+    authenticate(pCode, function(err, token) {
+        var result = { "token": token };
+        
+        fs.createWriteStream('tokens.json',{'flags': 'a'})
+            .end('{' + pCode + ':' + token + '}\n');
+        
+        console.log(result);
+        console.log(err);
+    });
+    
+    if(typeof pCallBack === 'function')
+        pCallBack();
+}
+
+/* Load config defaults from JSON file.
+ *  Environment variables override defaults.
+ */
+
+
+function authenticate(pCode, cb) {
+    var data = qs.stringify({
+        client_id       : Config.oauth_client_id,
+        client_secret   : Config.oauth_client_secret,
+        code            : pCode
+    });
+
+    var reqOptions = {
+        host: "github.com",
+        port: 443,
+        path: "/login/oauth/access_token",
+        method: "POST",
+        headers : { 'content-length': data.length }
+    };
+    
+    var body = "";
+    var req = https.request(reqOptions, function(res) {
+        res.setEncoding('utf8');
+        res.on('data', function (chunk) { body += chunk; });
+        res.on('end', function() {
+            cb(null, qs.parse(body).access_token);          
+        });
+    });
+    
+    req.write(data);
+    req.end();
+    req.on('error', function(e) { cb(e.message); });
+}