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Report Apple Ad attribution using pixel (#2510)
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,159 @@ | ||
| // | ||
| // AdAttributionFetcher.swift | ||
| // DuckDuckGo | ||
| // | ||
| // Copyright © 2024 DuckDuckGo. All rights reserved. | ||
| // | ||
| // 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 AdServices | ||
| import Common | ||
|
|
||
| protocol AdAttributionFetcher { | ||
| func fetch() async -> AdServicesAttributionResponse? | ||
| } | ||
|
|
||
| /// Fetches ad attribution data for from Apple. | ||
| /// | ||
| /// DuckDuckGo uses the AdServices framework to fetch and monitor anonymous install attribution data from Apple. No personally identifiable data is involved. | ||
| /// DuckDuckGo does not use the App Tracking Transparency framework at any point, and only uses the “standard” attribution payload. | ||
| /// See https://developer.apple.com/documentation/adservices/aaattribution/attributiontoken()#Attribution-payload-descriptions for details. | ||
| struct DefaultAdAttributionFetcher: AdAttributionFetcher { | ||
|
|
||
| typealias TokenGetter = () throws -> String | ||
|
|
||
| private let tokenGetter: TokenGetter | ||
| private let urlSession: URLSession | ||
| private let retryInterval: TimeInterval | ||
|
|
||
| init(tokenGetter: @escaping TokenGetter = Self.fetchAttributionToken, | ||
| urlSession: URLSession = .shared, | ||
| retryInterval: TimeInterval = .seconds(5)) { | ||
| self.tokenGetter = tokenGetter | ||
| self.urlSession = urlSession | ||
| self.retryInterval = retryInterval | ||
| } | ||
|
|
||
| func fetch() async -> AdServicesAttributionResponse? { | ||
| guard #available(iOS 14.3, *) else { | ||
| return nil | ||
| } | ||
|
|
||
| var lastToken: String? | ||
|
|
||
| for _ in 0..<Constant.maxRetries { | ||
| do { | ||
| try Task.checkCancellation() | ||
|
|
||
| let token = try (lastToken ?? tokenGetter()) | ||
| lastToken = token | ||
| return try await fetchAttributionData(using: token) | ||
| } catch let error as AdAttributionFetcherError { | ||
| os_log("AdAttributionFetcher failed to fetch attribution data: %@. Retrying.", log: .adAttributionLog, error.localizedDescription) | ||
|
|
||
| if error == .invalidToken { | ||
| lastToken = nil | ||
| } | ||
|
|
||
| if error.allowsRetry { | ||
| try? await Task.sleep(interval: retryInterval) | ||
| continue | ||
| } else { | ||
| break | ||
| } | ||
| } catch { | ||
| os_log("AdAttributionFetcher failed to fetch attribution data: %@", log: .adAttributionLog, error.localizedDescription) | ||
|
|
||
| // Do not retry | ||
| break | ||
| } | ||
| } | ||
|
|
||
| return nil | ||
| } | ||
|
|
||
| private func fetchAttributionData(using token: String) async throws -> AdServicesAttributionResponse { | ||
| let request = createAttributionDataRequest(with: token) | ||
| let (data, response) = try await urlSession.data(for: request) | ||
|
|
||
| guard let response = response as? HTTPURLResponse else { | ||
| throw AdAttributionFetcherError.invalidResponse | ||
| } | ||
|
|
||
| switch response.statusCode { | ||
| case 200: | ||
| let decoder = JSONDecoder() | ||
| let decoded = try decoder.decode(AdServicesAttributionResponse.self, from: data) | ||
|
|
||
| return decoded | ||
| case 400: | ||
| throw AdAttributionFetcherError.invalidToken | ||
| case 404: | ||
| throw AdAttributionFetcherError.invalidResponse | ||
| default: | ||
| throw AdAttributionFetcherError.unknown | ||
| } | ||
| } | ||
|
|
||
| private func createAttributionDataRequest(with token: String) -> URLRequest { | ||
| var request = URLRequest(url: Constant.attributionServiceURL) | ||
| request.httpMethod = "POST" | ||
| request.setValue("text/plain", forHTTPHeaderField: "Content-Type") | ||
| request.httpBody = token.data(using: .utf8) | ||
|
|
||
| return request | ||
| } | ||
|
|
||
| private struct Constant { | ||
| static let attributionServiceURL = URL(string: "https://api-adservices.apple.com/api/v1/")! | ||
| static let maxRetries = 3 | ||
| } | ||
| } | ||
|
|
||
| extension AdAttributionFetcher { | ||
| static func fetchAttributionToken() throws -> String { | ||
| if #available(iOS 14.3, *) { | ||
| return try AAAttribution.attributionToken() | ||
| } else { | ||
| throw AdAttributionFetcherError.attributionUnsupported | ||
| } | ||
| } | ||
| } | ||
|
|
||
| struct AdServicesAttributionResponse: Decodable { | ||
| let attribution: Bool | ||
| let orgId: Int? | ||
| let campaignId: Int? | ||
| let conversionType: String? | ||
| let adGroupId: Int? | ||
| let countryOrRegion: String? | ||
| let keywordId: Int? | ||
| let adId: Int? | ||
| } | ||
|
|
||
| enum AdAttributionFetcherError: Error { | ||
| case attributionUnsupported | ||
| case invalidResponse | ||
| case invalidToken | ||
| case unknown | ||
|
|
||
| var allowsRetry: Bool { | ||
| switch self { | ||
| case .invalidToken, .invalidResponse: | ||
| return true | ||
| case .unknown, .attributionUnsupported: | ||
| return false | ||
| } | ||
| } | ||
| } |
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