feat: offer no-key MyMemory translation provider

2026-10-15 10:48:20 +02:00
parent fa3fc762ec
commit d0a66c29a8
4 changed files with 125 additions and 15 deletions
@@ -0,0 +1,47 @@
+import Foundation
+
+public enum MyMemoryAPI {
+    public static func translate(_ text: String) async throws -> String {
+        try await translate(text) { try await URLSession.shared.data(for: $0) }
+    }
+
+    static func translate(
+        _ text: String, load: @Sendable (URLRequest) async throws -> (Data, URLResponse)
+    ) async throws -> String {
+        guard !text.trimmingCharacters(in: .whitespacesAndNewlines).isEmpty else {
+            throw Failure(message: "Enter English text to translate.")
+        }
+        guard text.utf8.count <= 500 else {
+            throw Failure(message: "MyMemory allows at most 500 UTF-8 bytes per translation. Shorten the text or choose OpenAI.")
+        }
+        var url = URLComponents(string: "https://api.mymemory.translated.net/get")!
+        url.queryItems = [URLQueryItem(name: "q", value: text), URLQueryItem(name: "langpair", value: "en|ja")]
+        let request = URLRequest(url: url.url!, cachePolicy: .reloadIgnoringLocalCacheData, timeoutInterval: 30)
+        let (data, response) = try await load(request)
+        try Task.checkCancellation()
+        guard let response = response as? HTTPURLResponse, (200...299).contains(response.statusCode) else {
+            throw Failure(message: "MyMemory request failed. Try again later or choose OpenAI.")
+        }
+        let result = try JSONDecoder().decode(Response.self, from: data)
+        guard result.quotaFinished != true, result.responseStatus != 429 else {
+            throw Failure(message: "MyMemory's anonymous daily quota is exhausted. Try later or choose OpenAI.")
+        }
+        guard result.responseStatus == 200,
+              let translation = result.responseData?.translatedText,
+              !translation.trimmingCharacters(in: .whitespacesAndNewlines).isEmpty else {
+            throw Failure(message: "MyMemory returned no successful translation. Try again later or choose OpenAI.")
+        }
+        return translation
+    }
+
+    private struct Response: Decodable {
+        let responseStatus: Int
+        let quotaFinished: Bool?
+        let responseData: Translation?
+        struct Translation: Decodable { let translatedText: String? }
+    }
+    private struct Failure: LocalizedError {
+        let message: String
+        var errorDescription: String? { message }
+    }
+}