Titanium Appcelerator Quickie: Parse API : parse.js

parse.js

//Public client interface
function Client(applicationId, masterKey) {
	this.applicationId = "applicationId";
	this.masterKey = "masterKey";
}

exports.Client = Client;

//Parse API endpoint
var ENDPOINT = 'https://api.parse.com/1/classes/';

/*
 * Make an authenticated client request.  Argument hash:
 *
 * url: url endpoint to hit
 * method: HTTP method to use
 * payload (optional): A JavaScript object to JSON-serialize
 * success (optional): a function to be called on a successful request
 * error (optional): a function to be called on a server error
 */
Client.prototype.request = function(args) {
	var xhr = Ti.Network.createHTTPClient(), that = this;

	xhr.onload = function() {
		var response = JSON.parse(this.responseText);
		(args.success) ? args.success(response) : Ti.API.debug('Parse Client: Request Successful');
	};
	xhr.onerror = function() {
		var response = JSON.parse(this.responseText);
		(args.error) ? args.error(response, this) : Ti.API.error('Parse Client: Request Failed: ' + args.url);
	};

	if(args.method == 'PUT' || args.method == 'POST') {
		xhr.open(args.method, ENDPOINT + args.url);
		var authString = Base64.encode(that.applicationId + ':' + that.masterKey);
		xhr.setRequestHeader('Authorization', 'Basic ' + authString);
		xhr.setRequestHeader('Content-Type', 'application/json');
		xhr.send(JSON.stringify(args.payload));
	} else {
		var body = ENDPOINT + args.url + "?";
		var paramMap = args.payload || {};
		for(var a in paramMap) {
			body += Titanium.Network.encodeURIComponent(a) + '=' + Titanium.Network.encodeURIComponent(paramMap[a]) + '&';
		}

		Ti.API.debug(body);

		xhr.open(args.method, body);
		var authString = Base64.encode(that.applicationId + ':' + that.masterKey);
		xhr.setRequestHeader('Authorization', 'Basic ' + authString);
		xhr.setRequestHeader('Content-Type', 'application/json');
		xhr.send();
	}

};

/*
 * Create a Parse object.  Argument hash:
 *
 * className: string name of the Parse class
 * object: The object to save
 * success: function to call on success
 * error: function to call on error
 *
 */
Client.prototype.create = function(args) {
	this.request({
		url : args.className,
		method : 'POST',
		payload : args.object,
		success : args.success,
		error : args.error
	});
};

/*
 * Get a Parse object.  Argument hash:
 *
 * className: string name of the Parse class
 * objectId: The object ID of the object you're getting
 * success: function to call on success
 * error: function to call on error
 *
 */
Client.prototype.get = function(args) {
	this.request({
		url : args.className + (args.objectId ? '/' + args.objectId : ''),
		method : 'GET',
		payload : args.payload, //< --- NEW
		success : function(response) {
			args.success(response);
		},
		error : args.error
	});
};

/*
 * Update a Parse object.  Argument hash:
 *
 * className: string name of the Parse class
 * objectId: The object ID of the object you're getting
 * object: the fields on the object you would like to update
 * success: function to call on success
 * error: function to call on error
 *
 */
Client.prototype.update = function(args) {
	this.request({
		url : args.className + '/' + args.objectId,
		method : 'PUT',
		payload : args.object,
		success : args.success,
		error : args.error
	});
};

/*
 * Delete a Parse object.  Argument hash:
 *
 * className: string name of the Parse class
 * objectId: The object ID of the object you're deleting
 * success: function to call on success
 * error: function to call on error
 *
 */
Client.prototype.remove = function(args) {
	this.request({
		url : args.className + '/' + args.objectId,
		method : 'DELETE',
		success : args.success,
		error : args.error
	});
};

//a non-jacked base 64 encode implementation
var Base64 = {
	// private property
	_keyStr : "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=",

	// public method for encoding
	encode : function(input) {
		var output = "";
		var chr1, chr2, chr3, enc1, enc2, enc3, enc4;
		var i = 0;

		input = Base64._utf8_encode(input);

		while(i < input.length) {

			chr1 = input.charCodeAt(i++);
			chr2 = input.charCodeAt(i++);
			chr3 = input.charCodeAt(i++);

			enc1 = chr1 >> 2;
			enc2 = ((chr1 & 3) << 4) | (chr2 >> 4);
			enc3 = ((chr2 & 15) << 2) | (chr3 >> 6);
			enc4 = chr3 & 63;

			if(isNaN(chr2)) {
				enc3 = enc4 = 64;
			} else if(isNaN(chr3)) {
				enc4 = 64;
			}

			output = output + Base64._keyStr.charAt(enc1) + Base64._keyStr.charAt(enc2) + Base64._keyStr.charAt(enc3) + Base64._keyStr.charAt(enc4);

		}

		return output;
	},

	// public method for decoding
	decode : function(input) {
		var output = "";
		var chr1, chr2, chr3;
		var enc1, enc2, enc3, enc4;
		var i = 0;

		input = input.replace(/[^A-Za-z0-9\+\/\=]/g, "");

		while(i < input.length) {

			enc1 = Base64._keyStr.indexOf(input.charAt(i++));
			enc2 = Base64._keyStr.indexOf(input.charAt(i++));
			enc3 = Base64._keyStr.indexOf(input.charAt(i++));
			enc4 = Base64._keyStr.indexOf(input.charAt(i++));

			chr1 = (enc1 << 2) | (enc2 >> 4);
			chr2 = ((enc2 & 15) << 4) | (enc3 >> 2);
			chr3 = ((enc3 & 3) << 6) | enc4;

			output = output + String.fromCharCode(chr1);

			if(enc3 != 64) {
				output = output + String.fromCharCode(chr2);
			}
			if(enc4 != 64) {
				output = output + String.fromCharCode(chr3);
			}

		}

		output = Base64._utf8_decode(output);

		return output;

	},

	// private method for UTF-8 encoding
	_utf8_encode : function(string) {
		string = string.replace(/\r\n/g, "\n");
		var utftext = "";

		for(var n = 0; n < string.length; n++) {

			var c = string.charCodeAt(n);

			if(c < 128) {
				utftext += String.fromCharCode(c);
			} else if((c > 127) && (c < 2048)) {
				utftext += String.fromCharCode((c >> 6) | 192);
				utftext += String.fromCharCode((c & 63) | 128);
			} else {
				utftext += String.fromCharCode((c >> 12) | 224);
				utftext += String.fromCharCode(((c >> 6) & 63) | 128);
				utftext += String.fromCharCode((c & 63) | 128);
			}

		}

		return utftext;
	},

	// private method for UTF-8 decoding
	_utf8_decode : function(utftext) {
		var string = "";
		var i = 0;
		var c = c1 = c2 = 0;

		while(i < utftext.length) {

			c = utftext.charCodeAt(i);

			if(c < 128) {
				string += String.fromCharCode(c);
				i++;
			} else if((c > 191) && (c < 224)) {
				c2 = utftext.charCodeAt(i + 1);
				string += String.fromCharCode(((c & 31) << 6) | (c2 & 63));
				i += 2;
			} else {
				c2 = utftext.charCodeAt(i + 1);
				c3 = utftext.charCodeAt(i + 2);
				string += String.fromCharCode(((c & 15) << 12) | ((c2 & 63) << 6) | (c3 & 63));
				i += 3;
			}

		}
		return string;
	}
};