jStorage.localstorage.js

(function (jStorage, undefined) {

	jStorage.providers.localstorage = {
		init: function (wrapper, config) {
			var self = this;
			this._config = config;
			this._hasCallback = config && typeof (config.callback) === "function";

			// Verifying that browser support localStorage
			// check if browser support localStorage AND has all methods we need.
			this._hasLocalStorage = "localStorage" in window
                && "setItem" in window["localStorage"]
                && "getItem" in window["localStorage"]
                && "removeItem" in window["localStorage"]
                && "setItem" in window["localStorage"];

			var callStatus = false;
			if (this._hasLocalStorage) {
				callStatus = {
					'isOK': true,
					'code': 0,
					'msg': ''
				};
			} else {
				callStatus = {
					'isOK': false,
					'code': -1,
					'msg': 'Browser doesn\'t support localStorage. User might be in "private mode" or have a old browser.'
				};
			}

			if (self._hasCallback) {
				try {
					self._config.callback(wrapper, callStatus);
				} catch (e) {
					// TODO: handle error
				}
			}
		},
		get: function (name, callback) {
			var self = this;
			var hasCallback = typeof (callback) === "function";
			var content = window.localStorage.getItem(name);

			var obj = {
				'name': name,
				'size': content ? content.length : 0,
				'mime-type': 'text/plain',
				'modified': new Date(),
				'data': content
			};
			var callStatus = {
				'isOK': content != null ? true : false,
				'code': 0,
				'msg': ''
			};

			// TODO: Only return successfull call if browser supports localStorage.
			if (hasCallback) {
				callback(obj, callStatus);
			}
		},
		set: function (name, content, callback) {
			var self = this;
			var hasCallback = typeof (callback) === "function";

			window.localStorage.setItem(name, content);

			var obj = {
				'name': name,
				'size': content ? content.length : 0,
				'mime-type': 'plain/text',
				'modified': new Date()
			};
			var callStatus = {
				'isOK': true,
				'code': 0,
				'msg': ''
			};

			// TODO: Only return successfull call if browser supports localStorage.
			if (hasCallback) {
				callback(obj, callStatus);
			}
		},
		move: function (currentName, newName, callback) {
			var self = this;
			var hasCallback = typeof (callback) === "function";

			var callStatus = false;
			var data = window.localStorage.getItem(currentName);
			if (data) {
				window.localStorage.setItem(newName, data);
				window.localStorage.removeItem(currentName);
				callStatus = {
					'isOK': true,
					'code': 0,
					'msg': ''
				};
			} else {
				callStatus = {
					'isOK': false,
					'code': -1,
					'msg': 'no file to move'
				};
			}

			// TODO: Only return successfull call if browser supports localStorage.
			if (hasCallback) {
				callback(callStatus);
			}
		},
		del: function (name, callback) {
			var self = this;
			var hasCallback = typeof (callback) === "function";

			// logic to see if key is in "virtual" folder and then return it if is..
			var found = false;
			for (var key in window.localStorage) {
				if (key.indexOf(name) == 0) {
					window.localStorage.removeItem(key);
					found = true;
				}
			}


			var callStatus = {
				'isOK': found,
				'code': 0,
				'msg': ''
			};

			// TODO: Only return successfull call if browser supports localStorage.
			if (hasCallback) {
				callback(callStatus);
			}
		},
		list: function (name, callback) {
			var self = this;
			var hasCallback = typeof (callback) === "function";

			var lists = [];

			var keys = {};
			// logic to see if key is in "virtual" folder and then return it if is..
			for (var key in window.localStorage) {
				if (name) {
					if (name.lastIndexOf('/') != (name.length - 1)) {
						name += '/';
					}
				}
				if (key.indexOf(name) == 0) {
					var tmp = key.replace(name, '');
					var tmpIndex = tmp.indexOf('/');
					// Remove leading slash 
					if (tmpIndex == 0) {
						tmp = tmp.substr(1);
						tmpIndex = tmp.indexOf('/');
					}
					// This is a subfolder...
					if (tmpIndex > 0) {
						tmp = tmp.substr(0, tmpIndex);
						tmpIndex = tmp.indexOf('/');
					}
					// Remove leading slash 
					if (tmpIndex == 0) {
						tmp = tmp.substr(1);
					}

					var fullname = name + tmp;

					// Make sure subfolders are only added once
					if (!(tmp in keys)) {
						var item = localStorage.getItem(fullname);
						// Will not match folders
						var size = 0;
						if (item) {
							size = localStorage.getItem(fullname).length;
						}

						lists.push({
							'path': fullname,
							'name': tmp,
							'size': size,
							'mime-type': size ? 'plain/text' : 'folder',
							'modified': new Date()
						});
						keys[tmp] = true;
					}

				}
			}

			var callStatus = {
				'isOK': lists.length ? true : false,
				'code': 0,
				'msg': ''
			};

			// TODO: Only return successfull call if browser supports localStorage.
			if (hasCallback) {
				callback(lists, callStatus);
			}
		},
		exists: function (name, callback) {
			var self = this;
			var hasCallback = typeof (callback) === "function";

			var exists = name in window.localStorage;

			// TODO: Only return successfull call if browser supports localStorage.
			var callStatus = {
				'isOK': true,
				'code': 0,
				'msg': ''
			};

			if (hasCallback) {
				// File exists
				callback(exists, callStatus);
			}
		}
	};
})(jStorage);