ActivityObject.ensureObject = function(obj, callback) {
var type = obj.objectType,
Cls,
id = obj.id,
url = obj.url,
tryDiscover = function(obj, cb) {
Step(
function() {
ActivityObject.discover(obj, this);
},
function(err, remote) {
if (err) {
tryCreate(obj, cb);
} else {
tryCreate(remote, cb);
}
}
);
},
tryCreate = function(obj, cb) {
Step(
function() {
Cls.create(obj, this);
},
function(err, result) {
if (err && err.name == "AlreadyExistsError") {
ActivityObject.ensureObject(obj, cb);
} else if (err) {
cb(err, null);
} else {
cb(null, result);
}
}
);
},
softGet = function(Cls, id, cb) {
Step(
function() {
Cls.get(id, this);
},
function(err, result) {
if (err && err.name == "NoSuchThingError") {
cb(null, null);
} else if (!err) {
cb(null, result);
} else {
cb(err, null);
}
}
);
},
findOne = function(Cls, criteria, cb) {
Step(
function() {
Cls.search(criteria, this);
},
function(err, results) {
if (err) throw err;
if (!results || results.length === 0) {
cb(null, null);
} else {
cb(null, results[0]);
}
}
);
};
// Since this is a major entry point, check our arguments
if (!_.isString(id) && !_.isUndefined(id)) {
callback(new TypeError("ID is not a string: " + id), null);
return;
}
if (!_.isString(url) && !_.isUndefined(url)) {
callback(new TypeError("URL is not a string: " + url), null);
return;
}
if (!_.isString(type)) {
callback(new TypeError("Type is not a string: " + type), null);
return;
}
Cls = ActivityObject.toClass(type);
Step(
function() {
if (_.isString(id)) {
softGet(Cls, id, this);
} else if (_.isString(url)) {
// XXX: we could use other fields here to guide search
findOne(Cls, {url: url}, this);
} else {
// XXX: without a unique identifier, just punt
this(null, null);
}
},
function(err, result) {
var delta;
if (err) throw err;
if (!result) {
if (!ActivityObject.isLocal(obj)) {
tryDiscover(obj, callback);
} else {
// XXX: Log this; it's unusual
tryCreate(obj, callback);
}
} else if (!ActivityObject.isLocal(obj) &&
!ActivityObject.isReference(obj) &&
(ActivityObject.isReference(result) || obj.updated > result.updated)) {
delta = ActivityObject.delta(result, obj);
result.update(delta, function(err) {
if (err) {
callback(err, null);
} else {
callback(null, result);
}
});
} else {
callback(null, result);
}
}
);
};
ActivityObject.ensureObject = function(obj, callback) {
var type = obj.objectType,
Cls,
id = obj.id,
url = obj.url,
getRemoteObject = function(url, cb) {
var Host = require("./host").Host;
Step(
function() {
var hostname = urlparse(url).hostname;
Host.ensureHost(hostname, this);
},
function(err, host) {
if (err) throw err;
host.getOAuth(this);
},
function(err, oa) {
if (err) throw err;
oa.get(url, null, null, this);
},
function(err, body, resp) {
var parsed;
if (err) throw err;
if (resp.statusCode != 200) {
throw new Error("Bad status code: " + resp.statusCode);
}
if (!resp.headers["content-type"] || resp.headers["content-type"].substr(0, 16) != "application/json") {
throw new Error("Bad content type: " + resp.headers["content-type"]);
}
parsed = JSON.parse(body);
this(null, parsed);
},
cb
);
},
mergeLinks = function(jrd, obj) {
var feeds = ["followers", "following", "links", "favorites", "likes", "replies", "shares"];
_.each(jrd.links, function(link) {
var rel = link.rel;
if (_.contains(feeds, rel)) {
obj[rel] = {url: link.href};
} else {
if (!obj.links) {
obj.links = {};
}
obj.links[rel] = {href: link.href};
}
});
},
tryDiscover = function(obj, cb) {
var proto = ActivityObject.protocolOf(obj.id),
wf;
if (!_.contains(["http", "https", "acct"], proto) ||
ActivityObject.isDomainToSkip(ActivityObject.domainOf(obj.id))) {
tryCreate(obj, cb);
return;
}
wf = require("webfinger");
Step(
function() {
wf.webfinger(obj.id, this);
},
function(err, jrd) {
var selfies;
if (err) throw err;
mergeLinks(jrd, obj);
selfies = _.filter(jrd.links, function(link) { return link.rel == "self"; });
if (selfies.length > 0) {
getRemoteObject(selfies[0].href, this);
} else {
this(null, obj);
}
},
function(err, remote) {
if (err) {
tryCreate(obj, cb);
} else {
tryCreate(remote, cb);
}
}
);
},
tryCreate = function(obj, cb) {
Step(
function() {
Cls.create(obj, this);
},
function(err, result) {
if (err && err.name == "AlreadyExistsError") {
ActivityObject.ensureObject(obj, cb);
} else if (err) {
cb(err, null);
} else {
cb(null, result);
}
}
);
},
softGet = function(Cls, id, cb) {
Step(
function() {
Cls.get(id, this);
},
function(err, result) {
if (err && err.name == "NoSuchThingError") {
cb(null, null);
} else if (!err) {
cb(null, result);
} else {
cb(err, null);
}
}
);
},
findOne = function(Cls, criteria, cb) {
Step(
function() {
Cls.search(criteria, this);
},
function(err, results) {
if (err) throw err;
if (!results || results.length == 0) {
cb(null, null);
} else {
cb(null, results[0]);
}
}
);
};
// Since this is a major entry point, check our arguments
if (!_.isString(id) && !_.isUndefined(id)) {
callback(new TypeError("ID is not a string: " + id), null);
return;
}
if (!_.isString(url) && !_.isUndefined(url)) {
callback(new TypeError("URL is not a string: " + url), null);
return;
}
if (!_.isString(type)) {
callback(new TypeError("Type is not a string: " + type), null);
return;
}
Cls = ActivityObject.toClass(type);
Step(
function() {
if (_.isString(id)) {
softGet(Cls, id, this);
} else if (_.isString(url)) {
// XXX: we could use other fields here to guide search
findOne(Cls, {url: url}, this);
} else {
// XXX: without a unique identifier, just punt
this(null, null);
}
},
function(err, result) {
var delta;
if (err) throw err;
if (!result) {
if (!ActivityObject.isLocal(obj)) {
tryDiscover(obj, callback);
} else {
// XXX: Log this; it's unusual
tryCreate(obj, callback);
}
} else if (!ActivityObject.isLocal(obj) &&
!ActivityObject.isReference(obj) &&
(ActivityObject.isReference(result) || obj.updated > result.updated)) {
delta = ActivityObject.delta(result, obj);
result.update(delta, function(err) {
if (err) {
callback(err, null);
} else {
callback(null, result);
}
});
} else {
callback(null, result);
}
}
);
};