Feature/3616 privacy on login

bwi/Wellknown/Wellknown+Bwi.swift

@@ -67,7 +67,38 @@ public extension MXWellKnown {
         catch {
             return .whenTyping
         }
-        
-        return .whenTyping
+    }
+    
+    // returns true if there is a valid url or no url, only the case "is url" but not valid is wrong
+    @objc func isValidDataPrivacyURL() -> Bool {
+        do {
+            let bwi = try WellknownBWI(dict: self.jsonDictionary()["de.bwi"] as! [String : Any])
+            
+            if let urlString = bwi.dataPrivacyURL {
+                if URL(string: urlString) != nil {
+                    return true
+                } else {
+                    return false
+                }
+            } else {
+                return true
+            }
+        } catch {
+            return true
+        }
+    }
+    
+    @objc func dataPrivacyURL() -> String? {
+        do {
+            guard let bwiDict = self.jsonDictionary()["de.bwi"] as? [String : Any] else {
+                return nil
+            }
+            
+            let bwi = try WellknownBWI(dict: bwiDict)
+            return  bwi.dataPrivacyURL
+        }
+        catch {
+            return nil
+        }
     }
 }

bwi/Wellknown/WellknownBWI.swift

@@ -0,0 +1,34 @@
+//
+/*
+ * Copyright (c) 2022 BWI GmbH
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+import Foundation
+
+struct WellknownBWI {
+    let dataPrivacyURL: String?
+    
+    init(dict: [String: Any]) throws {
+        let jsonData = try JSONSerialization.data(withJSONObject: dict, options: [])
+        let decoder = JSONDecoder()
+        self = try decoder.decode(Self.self, from: jsonData)
+    }
+}
+
+extension WellknownBWI: Decodable {
+    enum CodingKeys: String, CodingKey {
+        case dataPrivacyURL = "data_privacy_url"
+    }
+}