markvanwijnen

import SwiftUI
import UIKit

struct NavigationSearch: UIViewControllerRepresentable {
    typealias UIViewControllerType = Wrapper
    
    func makeCoordinator() -> Coordinator {
        Coordinator(representable: self)
    }

markvanwijnen

class TwitterAPI: NSObject, ObservableObject {
    struct ClientCredentials {
        static let APIKey = "YOUR_API_KEY"
        static let APIKeySecret = "YOUR_API_KEY_SECRET"
        static let CallbackURLScheme = "YOUR_CALLBACK_URL_SCHEME"
    }
}

markvanwijnen

import SwiftUI

@main
struct TwitterTutorialApp: App {
    @StateObject var twitterAPI = TwitterAPI() //1
    
    var body: some Scene {
        WindowGroup {
            ContentView()
                .environmentObject(twitterAPI) //2

markvanwijnen

import SwiftUI
import Combine // 1

class TwitterAPI: NSObject, ObservableObject {
    struct ClientCredentials { /*(...)*/ }
    
    lazy var onOAuthRedirect = PassthroughSubject<URL, Never>() // 2
}

markvanwijnen

import SwiftUI

@main
struct TwitterTutorialApp: App {
    @StateObject var twitterAPI = TwitterAPI()
    
    var body: some Scene {
        WindowGroup {
            ContentView()
                .environmentObject(twitterAPI)

markvanwijnen

extension CharacterSet {
    static var urlRFC3986Allowed: CharacterSet {
        CharacterSet(charactersIn: "-_.~").union(.alphanumerics)
    }
}

extension String {
    var oAuthURLEncodedString: String {
        self.addingPercentEncoding(withAllowedCharacters: .urlRFC3986Allowed) ?? self
    }

markvanwijnen

extension String {
    var urlQueryItems: [URLQueryItem]? {
        URLComponents(string: "://?\(self)")?.queryItems
    }
}

extension Array where Element == URLQueryItem {
    func value(for name: String) -> String? {
        return self.filter({$0.name == name}).first?.value
    }

markvanwijnen

import CommonCrypto

extension String {
    func hmacSHA1Hash(key: String) -> String {
        var digest = [UInt8](repeating: 0, count: Int(CC_SHA1_DIGEST_LENGTH))
        CCHmac(CCHmacAlgorithm(kCCHmacAlgSHA1),
               key,
               key.count,
               self,
               self.count,

markvanwijnen

private func oAuthSignatureBaseString(httpMethod: String,
                                      baseURLString: String,
                                      parameters: [URLQueryItem]) -> String {
    var parameterComponents: [String] = []
    for parameter in parameters {
        let name = parameter.name.oAuthURLEncodedString
        let value = parameter.value?.oAuthURLEncodedString ?? ""
        parameterComponents.append("\(name)=\(value)")
    }
    let parameterString = parameterComponents.sorted().joined(separator: "&")

markvanwijnen

private func oAuthSigningKey(consumerSecret: String,
                             oAuthTokenSecret: String?) -> String {
    if let oAuthTokenSecret = oAuthTokenSecret {
        return consumerSecret.oAuthURLEncodedString + "&" +
            oAuthTokenSecret.oAuthURLEncodedString
    } else {
        return consumerSecret.oAuthURLEncodedString + "&"
    }
}