Basic Hypermedia API implementation in Swift

hypermedia.swift

import UIKit

let userJSON = [
	"url": "https://example.com/users/123",
	"name": "Jim",
	"profile_url": "https://example.com/users/123/profile",
	"posts_url": "https://example.com/users/123/posts"
]

// API resources, such as User, Profile, Post, etc.

protocol Resource {
	var URI: NSURL { get }
	init(JSON: [String:AnyObject])
}

// For representing "links" to other resources

struct Reference<T : Resource> {
	let resourceURI: NSURL
}

struct CollectionReference<T : Resource> {
	let resourceURI: NSURL
}

// Implemented resources

class User : Resource {
	let URI: NSURL
	let name: String
	let profile: Reference<Profile>
	let posts: CollectionReference<Post>

	required init(JSON: [String:AnyObject]) {
		self.URI = NSURL(string: JSON["url"]! as String)!
		self.name = JSON["name"]! as String
		self.profile = Reference(resourceURI: NSURL(string: JSON["profile_url"]! as String)!)
		self.posts = CollectionReference(resourceURI: NSURL(string: JSON["posts_url"]! as String)!)
	}
}

class Profile : Resource {
	let URI: NSURL

	required init(JSON: [String:AnyObject]) {
		self.URI = NSURL(string: JSON["url"]! as String)!
	}
}

class Post : Resource {
	let URI: NSURL

	required init(JSON: [String:AnyObject]) {
		self.URI = NSURL(string: JSON["url"]! as String)!
	}
}

// Stubbed out client that makes requests against Resources and References

class Client {
	func get<R : Resource>(reference: Reference<R>, completion: (R) -> Void) {
		// Fetch thing
		// R(JSON: resultJSON)
	}

	func getCollection<R : Resource>(reference: CollectionReference<R>, completion: ([R]) -> Void) {
		// Fetch thing
		// R(JSON: resultJSON)
	}

	func put<R : Resource>(resource: R, completion: (R) -> Void) {
		// Update resource on server
	}

	func post<R : Resource>(resource: R, completion: (R) -> Void) {
		// Create resource on server
	}
}

// Usage

let client = Client()

let reference = Reference<User>(resourceURI: NSURL(string: userJSON["url"]! as String)!)

client.get(reference) { (user: User) -> Void in
	client.getCollection(user.posts) { posts in

	}

	client.get(user.profile) { profile in

	}
}