Swift iOS Networking Service

FooService.swift

import Foundation

struct VOService {
	
	public var baseUrl: String
	
	static let shared = VOService(mode: .production)
	
	init(mode: AppMode) {
		switch (mode) {
			default:
				baseUrl = "https://amg-staging.herokuapp.com"
		}
	}
	
	private func buildRequest(endpoint: String, params: [String: String], method: String, handler: @escaping (Data?, URLResponse?, Error?) -> Void) {
		guard let url = URL(string: "\(baseUrl)\(endpoint)") else {
			print("VOService.buildRequest(): could not build url")
			return
		}
		
		guard var components = URLComponents(url: url, resolvingAgainstBaseURL: false) else {
			print("VOService.buildRequest(): could not build url components")
			return
		}
		
		var queryParams: [URLQueryItem] = []
		
		for (key, value) in params {
			queryParams.append(URLQueryItem(name: key, value: value))
		}
		
		components.queryItems = queryParams
		
		var request = URLRequest(url: url)
		request.httpMethod = method
		request.httpBody = Data(components.url!.query!.utf8)
		
		return URLSession.shared.dataTask(with: request, completionHandler: handler).resume()
	}
	
	public func login(email: String, password: String, handler: @escaping (Data?, URLResponse?, Error?) -> Void) {
		let params = ["email": email, "password": password]
		buildRequest(endpoint: "/auth/sign_in", params: params, method: "POST", handler: handler)
	}
}