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user.js
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user.js
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var mongodb = require('mongodb'),
ObjectID = mongodb.ObjectID,
//mongoserver = new mongodb.Server('10.112.0.110', 26374),
mongoserver = new mongodb.Server('localhost', 26374),
dbConnector = new mongodb.Db('uenergy', mongoserver),
usersCollection, playlists;
var graph = require('fbgraph');
dbConnector.open(function(err, db){
if(err) {
console.log('connector.open error (login.js)');
console.log(err.message);
} else {
db.createCollection('users', function(err, collection) {
if(err) {
console.log('ERROR creating users collection (login.js)');
console.log(err.message);
} else {
collection.ensureIndex({fbid:1}, function(err) {
if(err) console.log(err);
});
usersCollection = collection;
}
});
db.createCollection('playlists', function(err, playcol) {
if(err) {
console.log('ERROR creating playlists collection');
console.log(err.message);
return;
}
playlists = playcol;
});
}
});
/*
playlist item needs
1) date+time added (definite), using javascript Date()
2) _id (definite)
3) locTitle (definite)
4) RID (if _id refers to a list)
5) itemTitle (possible)
playlists is Object
playlist is Object, playlist referred to by name
playlist contains video list, possibly others
video is object with those attributes
*/
function getQueries(req) {
parser = require('url');
var url = parser.parse(req.url, true);
return url.query;
}
function writeHeader(res, type) {
if(type == "html")
res.writeHead(200, {'Content-Type': 'text/html'});
else if(type == "json")
res.writeHead(200, {'Content-Type': 'application/json'});
}
function writeError(res, value) {
writeHeader(res, "json");
if(value != null)
res.end('{"response": "error", "value": ' + value + '}');
else
res.end('{"response": "error"}');
}
function writeSuccess(res, value) {
if(!value)
value = new Object();
value["success"] = true;
res.writeHead(200, {'Content-Type': 'application/json'});
res.end(JSON.stringify(value));
}
function writeCursor(res, cursor) {
writeHeader(res, "json");
cursor.toArray(function(err, docs) {
if(err) {
console.log(err);
writeError(res, "Error changing cursor to array");
return;
}
res.end(JSON.stringify(docs));
});
}
// creates a new playlist for a given user
function addPlaylist(req, res, next) {
if(!req['user']) {
writeError(res, "req['user'] doesn't exist"); return;
}
var userID = new ObjectID(req['user']);
if(!userID) { writeError(res, "ObjectID creation error"); return;}
if(!req['query']) {
writeError(res, "no query under req!"); return;
}
var query = req['query'];
if(!query['playlistName']) {
writeError(res, "query['playlistName'] doesn't exist"); return;
}
var playlistName = query['playlistName'];
if(playlistName == "Favorites") {
writeError(res, "playlist can't be named \"Favorites\"");
return;
}
var date = new Date();
var playlist = {
'name': playlistName,
'owner': userID,
'videos': new Array(),
'date': date
};
// inserts a playlist into the playlists collection
// updates the user's info with a reference to the inserted playlist
function insertPlaylist() {
playlists.insert(playlist, function(err, result) {
if(err) { writeError(res, err); return }
var playlistID = result[0]['_id'];
var playlistRef = {
'name': playlistName,
'_id': playlistID,
'date': date
};
// update with reference to playlists in user doc
usersCollection.update(
{'_id': userID},
{'$push': {'playlists': playlistRef}},
function(err, count) {
if(err) { writeError(res, err); return; }
writeSuccess(res, result);
}
);
});
}
// if a playlist exists with this name under this user, return error
// otherwise insert the playlist
// is this fast enough?
playlists.findOne(
{'owner': userID, 'name': playlistName},
function(err, doc) {
if(err) { writeError(res, err); return; }
if(doc) {
writeError(res, "playlist \""+playlistName+"\" exists already");
return;
}
insertPlaylist();
}
);
}
// remove a given playlist for a given user
function removePlaylist(req, res, next) {
if(!req['user']) {
writeError(res, "no user given"); return;
}
var userID = new ObjectID(req['user']);
if(!userID) { writeError(res, "no userID"); return;}
if(!req['query']) {
writeError(res, "req['query'] doesn't exist"); return;
}
var query = req['query'];
if(!query['playlistID']) {
writeError(res, "query['playlistID'] doesn't exist"); return;
}
var playlistID = new ObjectID(query['playlistID']);
// find the user doc, check that playlistID is not the favorites
// remove the playlist from playlists
// remove the reference to the playlist from the user doc
usersCollection.findOne({'_id': userID}, function(err, doc) {
if(err) { writeError(res, err); return; }
if(!doc) {
writeError(res, "user "+userID+" doesn't exist in system");
return;
}
// error if trying to delete Favorites playlist
if(doc['favId'].equals(playlistID)) {
writeError(res, "cannot delete Favorites playlist"); return;
}
// remove playlist from playlists for user
playlists.remove(
{'_id': playlistID, owner: userID},
function(err, result) {
if(err) { writeError(res, err); return;}
var pos = -1;
var playlistRefs = doc['playlists'];
for(var i = 0; i < playlistRefs.length; i++) {
if(playlistRefs[i]['_id'].equals(playlistID)) {
pos = i; break;
}
}
if(pos == -1) {
writeError(res,
"no reference to "+playlistID +" in user doc"); return;
}
// found a reference to the playlist in the user doc
playlistRefs.splice(pos, 1);
// update user doc to reflect deletion
usersCollection.update(
{'_id': userID},
{'$set': {'playlists': playlistRefs}},
function(err, count) {
if(err) { writeError(res,err); return; }
writeSuccess(res);
}
);
}
);
});
}
// renames a given playlist to a given name
function renamePlaylist(req, res, next) {
if(!req['user']) {
writeError(res, "req['user'] doesn't exist"); return;
}
var userID = new ObjectID(req['user']);
if(!userID) { writeError(res, "userID creation error"); return;}
if(!req['query']) {
writeError(res, "req['query'] doesn't exist"); return;
}
var query = req['query'];
if(!query['newPlaylistName']) {
writeError(res, "query['newPlaylistName'] doesn't exist");
return;
}
var newPlaylistName = query['newPlaylistName'];
if(!query['playlistID']) {
writeError(res, "query['playlistID'] doesn't exist"); return;
}
var playlistID = new ObjectID(query['playlistID']);
// make sure user isn't trying to rename a playlist to Favorites
if(newPlaylistName == "Favorites") {
writeError(res, "cannot rename a playlist to \"Favorites\"");
return;
}
usersCollection.findOne({'_id': userID}, function(err, userDoc) {
if(err) {
writeError(res, err); return;
}
if(!userDoc) {
writeError(res, "user " + userID + " doesn't exist in system");
return;
}
// disallow renaming Favorites playlist
if(userDoc['favId'].equals(playlistID)) {
writeError(res, "cannot rename Favorites playlist"); return;
}
var pos = -1;
// disallow renaming a playlist to an already-used name
var playlistRefs = userDoc['playlists'];
// is this good enough for long playlists?
for(var i = 0; i < playlistRefs.length; i++) {
if(playlistRefs[i]['name'] == newPlaylistName) {
writeError(res, "'"+newPlaylistName + "' already used");
return;
}
if(playlistRefs[i]['_id'].equals(playlistID))
pos = i;
}
if(pos == -1) {
writeError(res, "no reference to "+playlistID +" in user doc");
return;
}
// rename the playlist
playlists.update({'_id': playlistID, 'owner': userID},
{'$set': {'name': newPlaylistName}},
function(err) {
if(err) { writeError(res, err); return; }
playlistRefs[pos]['name'] = newPlaylistName;
// update the user's doc
usersCollection.update({'_id': userID},
{'$set': {'playlists': playlistRefs}},
function (err) {
if(err) { writeError(res, err); return; }
writeSuccess(res);
}
);
}
);
});
}
// returns info about user's favorites an other playlists
function getPlaylists(req, res, next) {
if(!req['user']) {
writeError(res, "req['user'] doesn't exist"); return;
}
var userID = new ObjectID(req['user']);
if(!userID) { writeError(res, "userID creation error"); return;}
usersCollection.findOne({'_id': userID}, function(err, userDoc){
if(err) { writeError(res, err); return; }
if(!userDoc) {
writeError(res, "user doesn't exist in system"); return;
}
if(!userDoc['favId']) {
writeError(res, "favId field under user doc nonexistent"); return;
}
writeSuccess(res, {
'favId': userDoc['favId'],
'playlists': userDoc['playlists']
});
});
}
// returns info about a given playlist, doesn't care if requester is owner
function getPlaylist(req, res, next) {
if(!req['user']) {
writeError(res, "req['user'] doesn't exist"); return;
}
var userID = new ObjectID(req['user']);
if(!userID) { writeError(res, "userID creation error"); return;}
if(!req['query']) {
writeError(res, "req['query'] doesn't exist!"); return;
}
var query = req['query'];
if(!query['playlistID']) {
writeError(res, "no playlistID provided"); return;
}
var playlistID = new ObjectID(query['playlistID']);
playlists.findOne({'_id': playlistID}, function(err, playlist) {
if(err) { writeError(res, err); return; }
else if(!playlist) {
writeError(res, "playlist "+playlistID+" doesn't exist in system");
return;
} else
writeSuccess(res, playlist);
});
}
// adds a video to a given playlist, user needs to own the playlist, for now
function addVideo(req, res, next) {
if(!req['user']) {
writeError(res, "req['user'] doesn't exist"); return;
}
var userID = new ObjectID(req['user']);
if(!userID) { writeError(res, "userID creation error"); return;}
if(!req['query']) {
writeError(res, "req['query'] doesn't exist!"); return;
}
var query = req['query'];
if(!query['playlistID']) {
writeError(res, "query['playlistID'] doesn't exist"); return;
}
var playlistID = new ObjectID(query['playlistID']);
var date = new Date();
// Object that stores video information
var video = new Object();
if(!query['locationID']) {
writeError(res, "query['locationID'] doesn't exist"); return;
}
video['locationID'] = query['locationID'];
if(!query['locTitle']) {
writeError(res, "query['locTitle'] doesn't exist"); return;
}
video['locTitle'] = query['locTitle'];
if(query['RID']) video['RID'] = query['RID'];
if(video['RID']) {
if(!query['itemTitle']) {
writeError(res, "query['itemTitle'] doesn't exist"); return;
} else {
video['itemTitle'] = query['itemTitle'];
}
}
video['date'] = date;
// doing it this way because permission to modify may extend to other users
/* not checking owner until playlist is retrieved, so permission policy
may be modified easily
*/
playlists.findOne({'_id': playlistID}, function(err, playlistDoc) {
if(err) { writeError(res, err); return; }
if(!playlistDoc) {
writeError(res,"playlist "+playlistID+" does not exist"); return;
}
if(playlistDoc['owner'].equals(userID) == false) {
writeError(res,
"user "+userID+" not allowed to modify "+playlistID); return;
}
var videos = playlistDoc['videos'];
if(!videos) videos = new Array();
// check if video already contained in the playlist
for(var i = 0; i < videos.length; i++) {
if(videos[i]['locationID'] == video['locationID']) {
if(video['RID']) {
if(videos[i]['RID'] == video['RID']) {
writeError(res, "video already in playlist"); return;
}
} else {
writeError(res, "video already in playlist"); return;
}
}
}
// add video to playlist
videos.push(video);
playlists.update({'_id': playlistID}, {'$set': {'videos': videos}},
function(err) {
if(err) { writeError(res,err); return; }
writeSuccess(res);
}
);
});
}
// removes video from given playlist, user needs to own playlist, for now
function removeVideo(req, res, next) {
if(!req['user']) {
writeError(res, "req['user'] doesn't exist"); return;
}
var userID = new ObjectID(req['user']);
if(!userID) { writeError(res, "userID creation error"); return;}
if(!req['query']) {
writeError(res, "req['query'] doesn't exist!"); return;
}
var query = req['query'];
if(!query['playlistID']) {
writeError(res, "query['playlistID'] doesn't exist"); return;
}
var playlistID = new ObjectID(query['playlistID']);
if(!query['locationID']) {
writeError(res, "query['locationID'] doesn't exist"); return;
}
var locationID = query['locationID'];
if(query['RID']) var RID = query['RID'];
// doing it this way because permission to modify may extend to other users
/* not checking owner until playlist is retrieved, so permission policy
may be modified easily
*/
playlists.findOne({'_id': playlistID}, function(err, playlistDoc) {
if(err) { writeError(res, err); return; }
if(!playlistDoc) {
writeError(res, "playlist "+playlistID+" does not exist"); return;
}
if(playlistDoc['owner'].equals(userID) == false) {
writeError(res,
"user "+userID+" not allowed to modify "+playlistID); return;
}
var videos = playlistDoc['videos'];
// check for position of video in the playlist
var pos = -1;
for(var i = 0; i < videos.length; i++) {
if(videos[i]['locationID'] == locationID) {
if(videos[i]['RID']) {
if(videos[i]['RID'] == RID) {
pos = i;
}
} else {
pos = i;
}
}
}
if(pos == -1) {
writeError(res, "video is not in the playlist"); return;
}
// remove video from playlist
videos.splice(pos, 1);
playlists.update({'_id': playlistID}, {'$set': {'videos': videos}},
function(err) {
if(err) { writeError(res,err); return; }
writeSuccess(res);
}
);
});
}
//update the streetcredit value
function scUpdate(req, res){
if(req.body.streetCreditCur && req.body._id){
var userID = new ObjectID(req['user']);
var incnum = parseInt(req.body.streetCreditCur);
usersCollection.update(
{_id:userID},
{'$inc': {'streetCredit': incnum}},
function(err, user) {
if(err) {
console.log(err + '\n scupdate');
writeError(res,err);
}
else{
writeSuccess(res);
}
}
);
}
}
//get basic info about a user. confirm they exist.
function getInfo(req, res){
if(req.user){
var userID = new ObjectID(req['user']);
usersCollection.findOne({_id:userID},function(err,user){
if(err){
writeError(res,'no such user!');
}
else if(user){
res.writeHead(200, {'Content-Type': 'application/json'});
var sc = user.streetCredit;
if(!sc) sc = 0;
var returned = {'success':true,'exists':true,'streetCredit':sc,
lastLocation: user.lastLocation, lastRID:user.lastRID,
noWelcome: user.noWelcome};
res.end(JSON.stringify(returned));
}
});
}
else writeError(res,'no user!');
}
//set lastLocation for next time
function lastLocation(req,res){
var postdata = req.query;
if(!postdata.lastRID) postdata.lastRID = null;
if(req.user){
var userID = new ObjectID(req['user']);
usersCollection.update(
{'_id': userID},
{'$set': postdata},
function(err) {
if(err) writeError(res,err.message);
else writeSuccess(res);
}
);
} else if(req.session){
req.session.lastLocation = postdata.lastLocation;
req.session.lastRID = postdata.lastRID;
writeSuccess(res);
}
else writeError(res,'no session or user');
}
//function to either initialize or pull a user to/from the database
function createUser(fbData, callback, session) {
usersCollection.findOne({'fbid':fbData.fbid}, function(err, user){
if(err){
console.log(err);
callback("error finding user in database");
}
else if(user){
callback(null,user._id)
}
else {
//console.log('FBCREATE:\n\n' + JSON.stringify(fbData));
fbData['streetCredit'] = 0;
if(session){
fbData.lastLocation = session.lastLocation;
fbData.lastRID = session.lastRID;
}
usersCollection.insert(
fbData,
{'safe': true},
function(err, records) {
if(err) { console.log(err); callback("insertion error"); }
//console.log('_id: '+records[0]._id);
var favorites = {
'name': "Favorites",
'owner': records[0]['_id'],
'videos': new Array(),
'date': new Date()
};
playlists.insert(favorites, function(err, result) {
if(err) { callback("insertion error playlists"); }
// update with reference to favorites in user doc
usersCollection.update(
{'_id': records[0]['_id']},
{'$set': {'favId': result[0]['_id']}},
function(err, count) {
if(err) {
callback("update error usersCollection");
}
callback(null,records[0]._id);
}
);
});
}
);
}
});
}
//recommend the current video on wall
function fbRecommend(req, res){
if(req.user && req.body){
var userID = new ObjectID(req['user']);
usersCollection.findOne({_id:userID},function(err,user){
if(err){
writeError(res,'no such user!');
}
else if(user){
var postdata = {};
var posturl = 'http://localhost:8888/l/'+req._id;
if(req.RID) posturl += "/" + req.RID;
if(req.type == 'artist') postdata['song'] = posturl;
else postdata['video'] = posturl;
//send request to facebook
graph.setAccessToken(user.accessToken)
.post("/me/samihost:recommend", postdata,function(err,data){
if(err) console.log(err)
else console.log(data)
});
}
});
}
}
//disables welcome message
function noWelcome(req,res){
var userID = new ObjectID(req['user']);
usersCollection.update(
{'_id': userID},
{'$set': {noWelcome:true}},
function(err) {
if(err) writeError(res,err.message);
else writeSuccess(res);
}
);
}
exports.noWelcome = noWelcome;
exports.lastLocation = lastLocation;
exports.fbRecommend = fbRecommend;
exports.scUpdate = scUpdate;
exports.getInfo = getInfo;
exports.addPlaylist = addPlaylist;
exports.removePlaylist = removePlaylist;
exports.renamePlaylist = renamePlaylist;
exports.getPlaylist = getPlaylist;
exports.getPlaylists = getPlaylists;
exports.addVideo = addVideo;
exports.removeVideo = removeVideo;
exports.createUser = createUser;