redirect uri causing issues when navigating to an oauth url - swift

Question

I am trying to navigate to the Microsoft Live oauth authentication page so that I can authorize my user and get a token for use by the app. When I use the following NSURL string, I am able to navigate to the site and authorize my app, retrieving the token.
let stringUrl = "https://login.live.com/oauth20_authorize.srf?client_id=\(clientId)&scope=\(scope)&response_type=code"
let url = NSURL(string: stringUrl)!
However, I want to redirect back to my app (using SFSafariViewController). In order to do so, I added a URL Scheme to my app, and passed that in as the redirect_uri in the URL.
let stringUrl = "https://login.live.com/oauth20_authorize.srf?client_id=\(clientId)&scope=\(scope)&response_type=code&redirect_uri=Lifestream://onedrive-oauth-callback"
let url = NSURL(string: stringUrl)!
However the Live login site gives me an error saying something went wrong and it couldn't continue. This error occurs before the oauth login page is displayed. It happens immediately upon navigating to the URL.
Am I creating my URL scheme incorrectly, or passing the scheme in to the redirect uri improperly? I'm confused as to why it works fine without the redirect_uri, but the site can't load when I provide it.
Can someone point me in the right direction on how I am supposed to pass a redirect url for my app, into an oauth redirect?
Update
It seems that Microsoft does not allow you to register a redirect URL that is a App URL scheme. I dont know how to get this info back into my app then, other than just paying for a site I can point MSFT to, which would then do nothing but redirects into the app for me.

Answer 1

I had a similar OAuth problem and didn't want to mess around with a web server so instead what I did was kinda cheeky. Make a UIWebView and put the request on the web view. Then delegate it to yourself and pass the redirect URL to be http://localhost:8000 (it can be anything like that it really doesn't matter). Then inside the delegate do this:
func webView(webView: UIWebView, shouldStartLoadWithRequest request: NSURLRequest, navigationType: UIWebViewNavigationType) -> Bool
{
if let URL = request.URL?.absoluteString
{
// This should be the redirect URL that you pass it can be anything like local host mentioned above.
if URL.hasPrefix(redirectURL)
{
// Now you can simply do some string manipulation to pull out the relevant components.
// I'm not sure what sort of token or how you get it back but assuming the redirect URL is
// YourRedirectURL&code=ACCESS_TOKEN and you want access token heres how you would get it.
var code : String?
if let URLParams = request.URL?.query?.componentsSeparatedByString("&")
{
for param in URLParams
{
let keyValue = param.componentsSeparatedByString("=")
let key = keyValue.first
if key == "code"
{
code = keyValue.last
}
}
}
// Here if code != nil then it has the ACCESS_TOKEN and you are done! If its nil something went wrong.
return false // So that the webview doesnt redirect to the dummy URL you passed.
}
}
return true
}
This is sorta hacky but it works great and you don't need any server nor do you need a redirect URI on your app, its an awesome way to do it in my opinion. You could optimize this for swift 2 to reduce the indentation by using guards but I wrote this before it came out so...
Hope this helps!