Forked from jkereako/ReCAPTCHAViewController.swift
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September 6, 2022 06:43
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ReCAPTCHA v2 in Swift
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| <!DOCTYPE html> | |
| <html> | |
| <head> | |
| <meta charset="utf-8" /> | |
| <meta name="viewport" content="width=device-width, initial-scale=1" /> | |
| <script src="https://www.google.com/recaptcha/api.js?onload=onLoad&render=explicit&hl=en" async defer></script> | |
| <title></title> | |
| <script type="text/javascript"> | |
| const post = function(value) { | |
| window.webkit.messageHandlers.recaptcha.postMessage(value); | |
| }; | |
| console.log = function(message) { | |
| post(message); | |
| }; | |
| var onLoad = function() { | |
| grecaptcha.render( | |
| "recaptcha", | |
| { | |
| sitekey: "${siteKey}", | |
| callback: function(token) { | |
| post(token); | |
| }, | |
| size: "normal" | |
| } | |
| ); | |
| }; | |
| </script> | |
| </head> | |
| <body> | |
| <div id="recaptcha"></div> | |
| </body> | |
| </html> |
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| import UIKit | |
| import WebKit | |
| final class ReCAPTCHAViewController: UIViewController { | |
| private var webView: WKWebView! | |
| private let viewModel: ReCAPTCHAViewModel | |
| init(viewModel: ReCAPTCHAViewModel) { | |
| self.viewModel = viewModel | |
| super.init(nibName: nil, bundle: nil) | |
| } | |
| required init?(coder: NSCoder) { | |
| fatalError("init(coder:) has not been implemented") | |
| } | |
| override func loadView() { | |
| let webConfiguration = WKWebViewConfiguration() | |
| let contentController = WKUserContentController() | |
| contentController.add(viewModel, name: "recaptcha") | |
| webConfiguration.userContentController = contentController | |
| webView = WKWebView(frame: .zero, configuration: webConfiguration) | |
| view = webView | |
| } | |
| override func viewDidLoad() { | |
| super.viewDidLoad() | |
| navigationItem.leftBarButtonItem = UIBarButtonItem( | |
| barButtonSystemItem: .close, | |
| target: self, | |
| action: #selector(didSelectCloseButton) | |
| ) | |
| webView.loadHTMLString(viewModel.html, baseURL: viewModel.url) | |
| } | |
| } | |
| // MARK: - Target-Actions | |
| private extension ReCAPTCHAViewController { | |
| @IBAction func didSelectCloseButton() { | |
| dismiss(animated: true) | |
| } | |
| } |
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| import WebKit | |
| protocol ReCAPTCHAViewModelDelegate: class { | |
| func didSolveCAPTCHA(token: String) | |
| } | |
| final class ReCAPTCHAViewModel: NSObject { | |
| weak var delegate: ReCAPTCHAViewModelDelegate? | |
| var html: String { | |
| guard let filePath = Bundle.main.path( | |
| forResource: "recaptcha", ofType: "html" | |
| ) else { | |
| assertionFailure("Unable to find the file.") | |
| return "" | |
| } | |
| let contents = try! String( | |
| contentsOfFile: filePath, encoding: .utf8 | |
| ) | |
| return parse(contents, with: ["siteKey": siteKey]) | |
| } | |
| let siteKey: String | |
| let url: URL | |
| /// Creates a ReCAPTCHAViewModel | |
| /// - Parameters: | |
| /// - siteKey: ReCAPTCHA's site key | |
| /// - url: The URL for registered with Google | |
| init(siteKey: String, url: URL) { | |
| self.siteKey = siteKey | |
| self.url = url | |
| super.init() | |
| } | |
| } | |
| // MARK: - WKScriptMessageHandler | |
| extension ReCAPTCHAViewModel: WKScriptMessageHandler { | |
| func userContentController(_ userContentController: WKUserContentController, | |
| didReceive message: WKScriptMessage) { | |
| guard let message = message.body as? String else { | |
| assertionFailure("Expected a string") | |
| return | |
| } | |
| delegate?.didSolveCAPTCHA(token: message) | |
| } | |
| } | |
| private extension ReCAPTCHAViewModel { | |
| func parse(_ string: String, with valueMap: [String: String]) -> String { | |
| var parsedString = string | |
| valueMap.forEach { key, value in | |
| parsedString = parsedString.replacingOccurrences( | |
| of: "${\(key)}", with: value | |
| ) | |
| } | |
| return parsedString | |
| } | |
| } |
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