Selecting a specific node in JSON using Appcelerator Titanium - json

Question

Hopefully an easy question for you.
I have an API service from Rackspace which I call, recently they changed the order of some of the responses, meaning part of my app would no longer upload images to the correct POST url.
I've put a temp fix in place by hard coding the URL's it should be posting to, but I want to be sure I future proof against any changes in their API ordering or indeed any changes to the URL itself.
So, originally I was using the JSON response and choosing the first node and its children.
var CFtenantID = getRSToken.access.serviceCatalog[0].endpoints[0].tenantId;
var CFregion = getRSToken.access.serviceCatalog[0].endpoints[0].region;
var CFpublicURL = getRSToken.access.serviceCatalog[0].endpoints[0].publicURL;
Now, that node has moved to position 18 in a long list. So, I can manually set the script to retrieve it.
var CFtenantID = getRSToken.access.serviceCatalog[17].endpoints[0].tenantId;
var CFregion = getRSToken.access.serviceCatalog[17].endpoints[0].region;
var CFpublicURL = getRSToken.access.serviceCatalog[17].endpoints[0].publicURL;
What I'd like to be able to do, is scan for the "name" instead and just return the CloudFiles info I need, rather than having to declare an actual number of the array.
Here is a snippet of the JSON response from Rackspace.
{
"name": "cloudFeeds",
"endpoints": [
{
"region": "LON",
"tenantId": "1234",
"publicURL": "https://lon.feeds.api.rackspacecloud.com/1234",
"internalURL": "https://atom.prod.lon3.us.ci.rackspace.net/1234"
}
],
"type": "rax:feeds"
},
{
"name": "cloudFiles",
"endpoints": [
{
"region": "LON",
"tenantId": "MossoCloudFS_xxxxxx",
"publicURL": "https://storage101.lon3.clouddrive.com/v1/MossoCloudFS_xxxxx",
"internalURL": "https://snet-storage101.lon3.clouddrive.com/v1/MossoCloudFS_xxxxx"
}
],
"type": "object-store"
},
{
"name": "cloudFilesCDN",
"endpoints": [
{
"region": "LON",
"tenantId": "MossoCloudFS_xxxxxx",
"publicURL": "https://cdn3.clouddrive.com/v1/MossoCloudFS_xxxxxx"
}
],
"type": "rax:object-cdn"
}
And here is my overall script in Appcelerator.
var authCloudFiles = Ti.Network.createHTTPClient({
onload: function() {
// output
Ti.API.info(this.responseText);
var getRSToken = JSON.parse(this.responseText);
var rsToken = getRSToken.access.token.id;
var rsTenantID = getRSToken.access.token.tenant.id;
var rsTenantName = getRSToken.access.token.tenant.name;
var CFtenantID = getRSToken.access.serviceCatalog[17].endpoints[0].tenantId;
var CFregion = getRSToken.access.serviceCatalog[17].endpoints[0].region;
var CFpublicURL = getRSToken.access.serviceCatalog[17].endpoints[0].publicURL;
var rsUserID = getRSToken.access.user.id;
Ti.App.Properties.setString('rsToken', rsToken);
Ti.App.Properties.setString('rsTenantID', rsTenantID);
Ti.App.Properties.setString('rsTenantName', rsTenantName);
Ti.App.Properties.setString('CFtenantID', CFtenantID);
Ti.App.Properties.setString('CFregion', CFregion);
Ti.App.Properties.setString('CFpublicURL', CFpublicURL);
Ti.App.Properties.setString('rsUserID', rsUserID);
//alert(rsToken);
Ti.API.info('rsToken: ' + rsToken);
Ti.API.info('rsTenantID: ' + rsTenantID);
Ti.API.info('rsTenantName: ' + rsTenantName);
Ti.API.info('CFtenantID: ' + CFtenantID);
Ti.API.info('CFregion: ' + CFregion);
Ti.API.info('CFpublicURL: ' + CFpublicURL);
Ti.API.info('rsUserID: ' + rsUserID);
// then we need to load the next step
rackspaceUpload();
}
});
authCloudFiles.open('POST', 'https://identity.api.rackspacecloud.com/v2.0/tokens');
Can anyone help?
Simon

Answer 1

I have never used Appcelerator Titanium before, but it looks like it is just JavaScript.
You could try replacing the following:
var CFtenantID = getRSToken.access.serviceCatalog[17].endpoints[0].tenantId;
var CFregion = getRSToken.access.serviceCatalog[17].endpoints[0].region;
var CFpublicURL = getRSToken.access.serviceCatalog[17].endpoints[0].publicURL;
with:
var CFtenantID = "";
var CFregion = "";
var CFpublicURL = "";
var catalog = getRSToken.access.serviceCatalog;
for (var i=0; i<catalog.length; i++) {
if (catalog[i].name == "cloudFiles") {
for (var j=0; i<catalog[i].endpoints.length; j++) {
if (catalog[i].endpoints[j].region == "LON") {
CFtenantID = catalog[i].endpoints[j].tenantId;
CFregion = catalog[i].endpoints[j].region;
CFpublicURL = catalog[i].endpoints[j].publicURL;
break;
}
}
}
}
My JavaScript is a little rusty though, you may want to add some additional error handling.