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122
WultraMobileTokenSDK/Operations/Utils/WMTPACUtils.swift
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| // | ||
| // Copyright 2023 Wultra s.r.o. | ||
| // | ||
| // 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. | ||
| // | ||
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| import Foundation | ||
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| /// Utility class used for handling Proximity Antifraud Check | ||
| public class WMTPACUtils { | ||
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| /// Method accepts deeplink URL and returns PAC data | ||
| public static func parseDeeplink(url: URL) -> WMTPACData? { | ||
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| guard let components = URLComponents(string: url.absoluteString) else { | ||
| D.error("Failed to get URLComponents: URLString is malformed \(url)") | ||
| return nil | ||
| } | ||
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| guard let queryItems = components.queryItems else { | ||
| D.error("Failed to get URLComponents queryItems for \(url)") | ||
| return nil | ||
| } | ||
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| // Deeplink can have two query items with operationId & optional totp or single query item with JWT value | ||
| if let operationId = queryItems.first(where: { $0.name == "oid" })?.value?.removingPercentEncoding { | ||
| let totp = queryItems.first(where: { $0.name == "totp" || $0.name == "potp" })?.value?.removingPercentEncoding | ||
| return WMTPACData(operationId: operationId, totp: totp) | ||
| } else if let code = queryItems.first?.value { | ||
| return parseJWT(code: code) | ||
| } else { | ||
| D.error("Failed to get Query Items values for parsing") | ||
| return nil | ||
| } | ||
| } | ||
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| /// Method accepts scanned code as a String and returns PAC data - it can be in deeplink format or JWT | ||
| public static func parseQRCode(code: String) -> WMTPACData? { | ||
| guard let encodedURLString = code.addingPercentEncoding(withAllowedCharacters: .urlQueryAllowed), let url = URL(string: encodedURLString) else { | ||
| return parseJWT(code: code) | ||
| } | ||
| // if the QR code is in the deeplink format parse it the same way as the deeplink | ||
| if url.scheme != nil { | ||
| return parseDeeplink(url: url) | ||
| } else { | ||
| return parseJWT(code: code) | ||
| } | ||
| } | ||
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| private static func parseJWT(code: String) -> WMTPACData? { | ||
| let jwtParts = code.split(separator: ".") | ||
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| // At this moment we dont care about header, we want only payload which is the second part of JWT | ||
| let jwtBase64String = jwtParts.count > 1 ? String(jwtParts[1]) : "" | ||
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| if let dataPayload = Data(base64Encoded: jwtBase64String.addBase64Padding) { | ||
| do { | ||
| return try JSONDecoder().decode(WMTPACData.self, from: dataPayload) | ||
| } catch { | ||
| D.error("Failed to decode JWT from: \(code)") | ||
| D.error("With error: \(error)") | ||
| return nil | ||
| } | ||
| } | ||
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| D.error("Failed to decode QR JWT from: \(jwtBase64String)") | ||
| return nil | ||
| } | ||
| } | ||
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| /// Data which is returned from parsing PAC code | ||
| public struct WMTPACData: Decodable { | ||
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| /// The ID of the operation associated with the PAC | ||
| public let operationId: String | ||
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| /// Time-based one time password used for Proximity antifraud check | ||
| public let totp: String? | ||
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| enum Keys: String, CodingKey { | ||
| case totp = "totp" | ||
| case potp = "potp" // to keep backward compatibility | ||
| case operationId = "oid" | ||
| } | ||
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| public init(operationId: String, totp: String?) { | ||
| self.operationId = operationId | ||
| self.totp = totp | ||
| } | ||
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| public init(from decoder: Decoder) throws { | ||
| let container = try decoder.container(keyedBy: Keys.self) | ||
| operationId = try container.decode(String.self, forKey: .operationId) | ||
| if let t = try container.decodeIfPresent(String.self, forKey: .totp) { | ||
| totp = t | ||
| } else if let p = try container.decodeIfPresent(String.self, forKey: .potp) { | ||
| totp = p | ||
| } else { | ||
| totp = nil | ||
| } | ||
| } | ||
| } | ||
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| private extension String { | ||
| var addBase64Padding: String { | ||
| let offset = count % 4 | ||
| if offset > 0 { | ||
| return padding(toLength: count + 4 - offset, withPad: "=", startingAt: 0) | ||
| } | ||
| return self | ||
| } | ||
| } |
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