face-recognition.js/public_html/js/lib/permanent-storage.js

/**************************
*     PermanentStorage    *
*         02-11-16        *
***************************
* Designed & Developed by *
*      xdrm-brackets      *
*            &            *
*        SeekDaSky        *
***************************
*    https://xdrm.io/     *
*  http://seekdasky.ovh/  *
**************************/

var PermanentStorage = function(){};

PermanentStorage.prototype = {

	/* STORES DATA TO REMOTE STORAGE
	*
	* @raw_data<String> 									Raw data to store
	* @callback<Function>									Callback function that'll take the @status as result
	*
	* @return status<Boolean>								If no error
	*
	* @note: @callback will be called with `this` bound to `xhr.responseText`
	*
	*/
	store: function(raw_data, callback){
		/* (0) Initialization */
			var fd, xhr;

		{ /* (1) Checks @raw_data argument */
			raw_data = raw_data || null;
			raw_data = typeof raw_data === 'string' ? raw_data : null;

			if( !raw_data )
				return false;
		}

		{ /* (2) Checks @callback argument */
			if( !(callback instanceof Function) )
				return false;
		}

		{ /* (3) Format data and wrap it into FormData */
			fd = new FormData();
			fd.append('command', 'store');
			fd.append('data', raw_data);
		}

		{ /* (4) Sends data to server */
			xhr = window.XMLHttpRequest ? new XMLHttpRequest() : new ActiveXObject('Microsoft.XMLHttpRequest');

			xhr.addEventListener('readystatechange', function(e){
				!(xhr.readyState-4) && !!~[0,200].indexOf(xhr.status) && ( xhr.responseText == 'success' && callback() || console.warn('[PermanentStorage] storeError') );
			}, false);

			xhr.open( 'POST', './permanent-storage/', true );
			xhr.send( fd );
		}

		return true;
	},

	/* FETCHES DATA FROM REMOTE STORAGE
	*
	* @callback<Function>									Callback function that'll take the @fetched_data as result
	*
	* @return raw_data<String> 								Fetched data
	*
	*/
	fetch: function(callback){
		/* (0) Initialization */
			var xhr, fd;

		{ /* (1) Checks @callback argument */
			if( !(callback instanceof Function) )
				return false;
		}

		{ /* (2) Set FormData */
			fd = new FormData();
			fd.append('command', 'fetch');
		}

		{ /* (2) Sends data to server */
			xhr = window.XMLHttpRequest ? new XMLHttpRequest() : new ActiveXObject('Microsoft.XMLHttpRequest');

			xhr.addEventListener('readystatechange', function(e){
				!(xhr.readyState-4) && !!~[0,200].indexOf(xhr.status) && ( xhr.responseText != 'error' && callback(xhr.responseText) || console.warn('[PermanentStorage] fetchError') );
			}, false);

			xhr.open( 'POST', './permanent-storage/', true );
			xhr.send( fd );
		}

	}
};