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tokenmanager.js
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tokenmanager.js
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var fs = require('fs');
var querystring = require('querystring');
var config = require('./config.json');
var bmwrequest = require('./bmwrequest.js');
const tokenFile = 'currenttoken.json';
function clearToken()
{
global.tokenType = undefined;
global.token = undefined;
if( fs.existsSync(tokenFile) )
fs.unlinkSync(tokenFile);
}
function requestToken(_success, _error)
{
clearToken();
// Credit goes to https://github.com/sergejmueller/battery.ebiene.de
var postData = querystring.stringify({
'username': config.username,
'password': config.password,
'client_id': 'dbf0a542-ebd1-4ff0-a9a7-55172fbfce35',
'redirect_uri': 'https://www.bmw-connecteddrive.com/app/default/static/external-dispatch.html',
'response_type': 'token',
'scope': 'authenticate_user fupo',
'state': 'eyJtYXJrZXQiOiJkZSIsImxhbmd1YWdlIjoiZGUiLCJkZXN0aW5hdGlvbiI6ImxhbmRpbmdQYWdlIn0',
'locale': 'DE-de'
});
bmwrequest.call('customer.bmwgroup.com', '/gcdm/oauth/authenticate', postData, function(data, headers)
{
var location = headers.location;
if(location === 'undefined')
{
_error("unexpected response, location header not defined");
return;
}
var values = querystring.parse(location);
var jsonstring = JSON.stringify(values, null, 4);
readTokenData(jsonstring, _success, _error);
}, _error);
}
function readTokenData(data, _success, _error)
{
var json;
try
{
json = JSON.parse(data);
}
catch (err)
{
_error(err);
return;
}
if(typeof(json.error) !== 'undefined' )
{
_error(json.error + ": " + json.error_description);
return;
}
if(typeof(json.token_type) === 'undefined' || typeof(json.access_token) === 'undefined')
{
_error("Couldn't find token in response " + data);
return;
}
global.tokenType = json.token_type;
global.token = json.access_token;
// CDP server seems to be picky, so be save and let the token expire two minutes earlier
var tokenExpiresInSeconds = json.expires_in - 120;
var expireDate;
var tokenFileExists = fs.existsSync(tokenFile);
var now = new Date();
if(tokenFileExists) {
var stat = fs.statSync(tokenFile);
expireDate = new Date(stat.mtime);
}
else
{
expireDate = now;
}
var expireTimestamp = expireDate.valueOf() + tokenExpiresInSeconds * 1000;
var nowTimestamp = now.valueOf();
var expired = nowTimestamp > expireTimestamp;
if(expired)
{
console.log("Token expired, requesting a new one");
requestToken(_success, _error);
}
else
{
if(!tokenFileExists)
{
fs.writeFile(tokenFile, data, function()
{
console.log("New token file has been written to file " + tokenFile);
}
);
}
_success();
}
}
exports.initialize = function(_success, _error)
{
fs.readFile(tokenFile, 'utf8', function(err, data)
{
if(err)
{
console.log("Failed to read file: " + err);
requestToken(_success, _error);
}
else
{
readTokenData(data, _success, function (err)
{
console.log("Failed to use existing token from file, error " + err + ", will request a new one");
requestToken(_success, _error);
});
}
})
};