An unofficial API to get Google+ streams.

gplus.stream.api.js

/*
    Google+ Stream API => An unofficial API to get Google+ streams.
    Copyright (C) 2012 Jingqin Lynn
    
    Based on the "An Unofficial Google+ Circle and Followers API for Google Chrome" poject
    https://github.com/mohamedmansour/google-plus-extension-jsapi
    by +Mohamed Mansour <https://github.com/mohamedmansour>
    Under the license: https://github.com/mohamedmansour/google-plus-extension-jsapi/blob/master/LICENSE.md
    
    This program is free software: you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation, either version 3 of the License, or
    (at your option) any later version.

    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.

    You should have received a copy of the GNU General Public License
    along with this program.  If not, see <http://www.gnu.org/licenses/>.

*/

// GSON = Google's irregular JSON
function parseGSON(raw) {
	var jsonString = raw.substring(4).replace(/\[,/g, '[null,');
	jsonString = jsonString.replace(/,\]/g, ',null]');
	jsonString = jsonString.replace(/,,/g, ',null,');
	jsonString = jsonString.replace(/,,/g, ',null,');
	return JSON.parse(jsonString);
}

_parsePost = function(element) {
	var item = {};
	item.type = element[2].toLowerCase();
	item.time = element[5];
	if (element[70]) {
		item.time_edited = parseInt((element[70] + '').substring(0, (item.time + '').length));
	}

	item.url = this._buildProfileURLFromItem(element[21]);
	item.is_public = (element[32] == '1');
	
	item.owner = {};
	item.owner.name = element[3];
	item.owner.id = element[16];
	item.owner.image = this._fixImage(element[18]);

	if (element[43]) { // Share?
		item.share = {};
		item.share.name = element[43][0];
		item.share.id = element[43][1];
		item.share.image = this._fixImage(element[43][4]);
		item.share.html = element[43][4];
		item.share.url = this._buildProfileURLFromItem(element[43][4]);
		item.html = element[47];
	}
	else { // Normal
		item.html = element[4];
	}

	// Parse hangout item.
	if (element[2] == 'Hangout') {
		var hangoutData = element[82][2][1][0];
		var hangoutURL = hangoutData[1];
		var hangoutID = hangoutData[0];
		var hangoutType = hangoutData[6];
		var isActive = hangoutURL == '' ? false : true;
		
		// Skip this since it isn't a hangout. It is just youtube content.
		if (isActive && hangoutID == '' && hangoutType == 2 /*normal*/) {
				// Perhaps we want to deal with this later.
		}
		else {
			item.owner.status = true;
			item.data = {};
			item.data.url = hangoutURL;
			item.data.type = hangoutType;
			item.data.active = isActive;
			item.data.id = hangoutID;
			item.data.participants = [];
			item.data.extra_data = hangoutData[13];
			
			var cachedOnlineUsers = {};
			var onlineParticipants = hangoutData[3];
			for (var i in onlineParticipants) {
				var elt = onlineParticipants[i];
				var user = this._buildUserFromItem(elt[2], elt[0], elt[1], true);
				cachedOnlineUsers[user.id] = true;
				item.data.participants.push(user);
			}
			var offlineParticipants = hangoutData[4];
			for (var i in offlineParticipants) {
				var elt = offlineParticipants[i];
				var user = this._buildUserFromItem(elt[2], elt[0], elt[1], false);
				if (!cachedOnlineUsers[user.id]) {
					item.data.participants.push(user);
				}
			}
		}
	}
	
	return item;
};

_fixImage = function(image) {
	if (image.indexOf('https') == -1) {
		image = 'https:' + image;
	}
	return image;
};

_buildProfileURLFromItem = function(url) {
	if (url.indexOf('https') == -1) {
		url = 'http://plus.google.com/' + url;
	}
	return url;
};

var pageTokens = new Array();
pageTokens.push(null);
var _pageTokenSet = {};

function getStream(circleId, page, callback, onerror) {
	var format = "https://plus.google.com/_/stream/getactivities/?sp=%5B1%2C2%2Cnull%2C{circleId}%2Cnull%2C20%2Cnull%2C%22social.google.com%22%2C%5B%5D%5D%26rt%3Dj";
	var url =  format.replace("{circleId}", circleId || "null") + "&_requid=" + new Date().getTime();
	
	if(page != null) {
		var token = pageTokens[page];
		if(token) url += '&ct=' + token;
	}
	
	chrome._url = url;
	
	var xhr = new XMLHttpRequest();
	xhr.onreadystatechange = function test() {
		if (xhr.readyState == XMLHttpRequest.DONE) {
			if(xhr.status==200) {
				callback(_parseStream(parseGSON(xhr.responseText)));
			}
			else {
				if(onerror) onerror(xhr);
			}
		}
	};
	xhr.open('GET', url, true);
	xhr.overrideMimeType('application/json; charset=UTF-8');
	xhr.send(null);
	
}

function _parseStream(o) {
	
	var posts = o[0][1][0];
	var page = o[0][1][1];
	if(!posts) {
		posts = o[0][1][1];
		page = o[1][1][1];
	}
	
	if(!_pageTokenSet[page]) {
		_pageTokenSet[page] = true;
		pageTokens.push(page);
	}
	
	var p = new Array();
	for(var i in posts) {
		var post = _parsePost(posts[i]);
		p.push(post);
	}
	return p;
}