add OAuthViewController

Author: Achyut Kumar M

GoInfoGame/GoInfoGame/UI/Login/OAuth/OAuthViewController.swift

@@ -5,4 +5,188 @@
 //  Created by Achyut Kumar M on 21/03/24.
 //
 
-import Foundation
+import SwiftUI
+import SafariServices
+import osmapi
+
+struct OAuthViewController: UIViewControllerRepresentable {
+        
+    private struct OAuthServer {
+        let authURL: String
+        let apiURL: String
+        let client_id: String
+    }
+    
+    private let servers: [OAuthServer] = [
+        OAuthServer(authURL: "https://www.openstreetmap.org/",
+                    apiURL: "https://api.openstreetmap.org/",
+                    client_id: "oR9y-ytJ1O1OnM1hnPXc8WHjBwmephYdu3Az0a4rXNU"),
+        
+        OAuthServer(authURL: "https://master.apis.dev.openstreetmap.org/",
+                    apiURL: "https://api06.dev.openstreetmap.org/",
+                    client_id: "oR9y-ytJ1O1OnM1hnPXc8WHjBwmephYdu3Az0a4rXNU")
+    ]
+
+    private let client_secret = "eRY8q6sI5JDA3FU2iw5awIyXShuGUD6z2hL0YTNjfGg"
+    private var server: OAuthServer { servers.first(where: { $0.apiURL == OSM_API_URL }) ?? servers[1] }
+    var client_id: String { server.client_id }
+    var serverURL: String { server.authURL }
+    var oauthUrl: URL { return URL(string: serverURL)!.appendingPathComponent("oauth2") }
+    
+    private let redirect_uri = "goinfogame://oauth/callback"
+    private let scope = "read_prefs write_prefs write_diary write_api write_notes write_redactions openid"
+    
+    let state = "random"
+        
+    func makeUIViewController(context: Context) ->  SFSafariViewController {
+        let url = url(withPath: "authorize", with: [
+            "client_id": client_id,
+            "redirect_uri": redirect_uri,
+            "response_type": "code",
+            "scope": scope,
+            "state": state
+        ])
+        return SFSafariViewController(url: url)
+    }
+    
+    func updateUIViewController(_ uiViewController: SFSafariViewController, context: Context) {
+        
+    }
+    
+    func getAccessTokenFor(url: URL, completion: @escaping (String)-> Void) {
+        
+        guard let components = URLComponents(url: url, resolvingAgainstBaseURL: true) else {
+           // apiCallback(.failure(OAuthError.badRedirectURL(url.absoluteString)));
+            //TODO: Handle error
+            return
+        }
+        guard
+            let code = components.queryItems?.first(where: { $0.name == "code" })?.value,
+            let state = components.queryItems?.first(where: { $0.name == "state" })?.value
+        else {
+         //   handleError(from: components)
+            return
+        }
+        guard state == self.state else {
+           // apiCallback(.failure(OAuthError.stateMismatch))
+            //TODO: Handle error
+            return
+        }
+        fetchAccessTokenFor(authCode: code, completion: completion)
+    }
+    
+    func fetchAccessTokenFor(authCode:String, completion: @escaping (String)-> Void) {
+        let postingJSON = [
+            "client_id": client_id,
+            "redirect_uri": redirect_uri,
+            "code": "\(authCode)",
+            "grant_type": "authorization_code",
+            "client_secret": client_secret,
+        ]
+        
+        let postingBody  = query(postingJSON).data(using: .utf8, allowLossyConversion: false)
+        
+        let session = URLSession(configuration: URLSessionConfiguration.default, delegate: nil, delegateQueue: nil)
+        let url: String = "https://master.apis.dev.openstreetmap.org/oauth2/token"
+        let request: NSMutableURLRequest = NSMutableURLRequest()
+        request.url = NSURL(string: url) as URL?
+        request.httpMethod = "POST"
+        //add params to request
+        request.httpBody = postingBody
+        let dataTask = session.dataTask(with: request as URLRequest) { (data: Data?, response:URLResponse?, error: Error?) -> Void in
+            if((error) != nil) {
+                print(error!.localizedDescription)
+            } else {
+                print("Succes:")
+                do {
+                    let parsedData = try JSONSerialization.jsonObject(with: data!, options: []) as! [String:Any]
+                    if let theAccessToken = parsedData["access_token"] as? String {
+                        let accessToken = theAccessToken
+                      _ = KeychainManager.save(key: "accessToken", data: accessToken)
+                        completion(accessToken)
+                    }
+                } catch let error as NSError {
+                    print(error)
+                }
+            }
+        }
+        dataTask.resume()
+        
+    }
+    
+    public func query(_ parameters: [String: String]) -> String {
+        var components: [(String, String)] = []
+        
+        for key in parameters.keys.sorted(by: <) {
+            let value = parameters[key]!
+            components += [(key, escape(value))]//queryComponents(fromKey: key, value: value)
+        }
+
+            return components.map { "\($0)=\($1)" }.joined(separator: "&")
+        }
+    
+    /// Function that uri encodes strings
+    ///
+    /// - Parameter string: un encoded uri query parameter
+    /// - Returns: encoded parameter
+    public func escape(_ string: String) -> String {
+        let generalDelimitersToEncode = ":#[]@" // does not include "?" or "/" due to RFC 3986 - Section 3.4
+        let subDelimitersToEncode = "!$&'()*+,;="
+
+        var allowedCharacterSet = CharacterSet.urlQueryAllowed
+        allowedCharacterSet.remove(charactersIn: "\(generalDelimitersToEncode)\(subDelimitersToEncode)")
+
+        var escaped = ""
+
+        //==========================================================================================================
+        //
+        //  Batching is required for escaping due to an internal bug in iOS 8.1 and 8.2. Encoding more than a few
+        //  hundred Chinese characters causes various malloc error crashes. To avoid this issue until iOS 8 is no
+        //  longer supported, batching MUST be used for encoding. This introduces roughly a 20% overhead. For more
+        //  info, please refer to:
+        //
+        //      - https://github.com/Alamofire/Alamofire/issues/206
+        //
+        //==========================================================================================================
+
+        if #available(iOS 8.3, *) {
+            escaped = string.addingPercentEncoding(withAllowedCharacters: allowedCharacterSet) ?? string
+        } else {
+            let batchSize = 50
+            var index = string.startIndex
+
+            while index != string.endIndex {
+                let startIndex = index
+                let endIndex = string.index(index, offsetBy: batchSize, limitedBy: string.endIndex) ?? string.endIndex
+                let range = startIndex..<endIndex
+
+                let substring = string.substring(with: range)
+
+                escaped += substring.addingPercentEncoding(withAllowedCharacters: allowedCharacterSet) ?? substring
+
+                index = endIndex
+            }
+        }
+
+        return escaped
+    }
+    
+    private func url(withPath path: String, with dict: [String: String]) -> URL {
+        var components = URLComponents(string: oauthUrl.appendingPathComponent(path).absoluteString)!
+        components.queryItems = dict.map({ k, v in URLQueryItem(name: k, value: v) })
+        return components.url!
+    }
+}
+
+extension URL {
+    var queryParameters: [String: String]? {
+        guard let components = URLComponents(url: self, resolvingAgainstBaseURL: true),
+              let queryItems = components.queryItems else {
+            return nil
+        }
+        
+        var parameters = [String: String]()
+        queryItems.forEach { parameters[$0.name] = $0.value }
+        return parameters
+    }
+}

GoInfoGame/GoInfoGame/UI/MapViewController.swift

@@ -12,6 +12,7 @@ class MapViewController: UIHostingController<MapView> {
 
     override func viewDidLoad() {
         super.viewDidLoad()
+        self.title = ""
 
         // Do any additional setup after loading the view.
 
@@ -37,7 +38,7 @@ class MapViewController: UIHostingController<MapView> {
     @objc func profileButtonTapped() {
          let profileView = ProfileView()
          let hostingController = UIHostingController(rootView: profileView)
-         present(hostingController, animated: true, completion: nil)
+        navigationController?.pushViewController(hostingController, animated: true)
      }
 
     @objc func widthDemoButtonTapped() {