Looking for a swift way to generate OAuth 1 signature

Question

I'm working on a small swift program to work with Yelp API over OAuth-1. I am looking to generate a HMAC-SHA1 signature.

I have the customer key, secret key , token and token secret.

From what I know, to make an API request with OAuth 1, we need the following attributes :

1. oauth_consumer_key
2. oauth_token
3. oauth_signature_method = (HMAC-SHA1)
4. oauth_signature
5. oauth_timestamp
6. oauth_nonce

How do I generate #4,5,6

I looked other this, but didn't help.

TIA!

Answer 1

Quite late response but I maintain a very lightweight Swift 3 easy to use extension that adds OAuth 1.0a capabilities to URLRequest.

It's called OhhAuth. Can be easy installed with Cocoa Pods or the Swift package manager.

pod 'OhhAuth'

I will add an usage example on how to interact with the Twitter API:

let cc = (key: "<YOUR APP CONSUMER KEY>", secret: "<YOUR APP CONSUMER SECRET>")
let uc = (key: "<YOUR USER KEY>", secret: "<YOUR USER SECRET>")

var req = URLRequest(url: URL(string: "https://api.twitter.com/1.1/statuses/update.json")!)

let paras = ["status": "Hey Twitter! \u{1F6A7} Take a look at this sweet UUID: \(UUID())"]

req.oAuthSign(method: "POST", urlFormParameters: paras, consumerCredentials: cc, userCredentials: uc)

let task = URLSession(configuration: .ephemeral).dataTask(with: req) { (data, response, error) in

    if let error = error {
        print(error)
    }
    else if let data = data {
        print(String(data: data, encoding: .utf8) ?? "Does not look like a utf8 response :(")
    }
}
task.resume()

If you are only interested in the signature, you can use:

OhhAuth.calculateSignature(url: URL, method: String, parameter: [String: String],
consumerCredentials cc: Credentials, userCredentials uc: Credentials?) -> String