From 6d2751d32632a90346202f581cc761d2d6d204fa Mon Sep 17 00:00:00 2001
From: Sven Weidauer <sven@5sw.de>
Date: Tue, 9 Nov 2021 20:46:04 +0100
Subject: [PATCH] Implement backports

---
 Package.swift                                 |  3 ++-
 Sources/AsyncBackports/Backport.swift         |  1 -
 .../AsyncBackports/URLSession+Backport.swift  | 25 ++++++++++++++++---
 3 files changed, 24 insertions(+), 5 deletions(-)

diff --git a/Package.swift b/Package.swift
index 8afa933..5d3b22d 100644
--- a/Package.swift
+++ b/Package.swift
@@ -5,7 +5,8 @@ import PackageDescription
 
 let package = Package(
     name: "AsyncBackports",
-    platforms: [        
+    platforms: [
+        // TODO: Xcode 13.2 set targets where backport available
         .macOS(.v12),
         .iOS(.v15),
         .watchOS(.v8),
diff --git a/Sources/AsyncBackports/Backport.swift b/Sources/AsyncBackports/Backport.swift
index 65519e4..fe18891 100644
--- a/Sources/AsyncBackports/Backport.swift
+++ b/Sources/AsyncBackports/Backport.swift
@@ -1,4 +1,3 @@
 public struct Backport<Original> {
     let original: Original
 }
-
diff --git a/Sources/AsyncBackports/URLSession+Backport.swift b/Sources/AsyncBackports/URLSession+Backport.swift
index 2b3f464..0c7becd 100644
--- a/Sources/AsyncBackports/URLSession+Backport.swift
+++ b/Sources/AsyncBackports/URLSession+Backport.swift
@@ -5,7 +5,6 @@ public extension URLSession {
 }
 
 public extension Backport where Original: URLSession {
-
     /// Convenience method to load data using an URLRequest, creates and resumes an URLSessionDataTask internally.
     ///
     /// - Parameter request: The URLRequest for which to load data.
@@ -16,7 +15,23 @@ public extension Backport where Original: URLSession {
     @available(tvOS, deprecated: 15.0, message: "No need for .backport any more")
     @available(watchOS, deprecated: 8.0, message: "No need for .backport any more")
     func data(for request: URLRequest, delegate: URLSessionTaskDelegate? = nil) async throws -> (Data, URLResponse) {
-        return try await original.data(for: request, delegate: delegate)
+        if #available(macOS 12.0, iOS 15.0, tvOS 15.0, watchOS 8.0, *) {
+            return try await original.data(for: request, delegate: delegate)
+        } else {
+            return try await withUnsafeThrowingContinuation { continuation in
+                let task = URLSession.shared.dataTask(with: request) { data, response, error in
+                    if let data = data, let response = response {
+                        continuation.resume(returning: (data, response))
+                    } else if let error = error {
+                        continuation.resume(throwing: error)
+                    } else {
+                        fatalError("Neither response nor error")
+                    }
+                }
+                task.delegate = delegate
+                task.resume()
+            }
+        }
     }
 
     /// Convenience method to load data using an URL, creates and resumes an URLSessionDataTask internally.
@@ -29,6 +44,10 @@ public extension Backport where Original: URLSession {
     @available(tvOS, deprecated: 15.0, message: "No need for .backport any more")
     @available(watchOS, deprecated: 8.0, message: "No need for .backport any more")
     func data(from url: URL, delegate: URLSessionTaskDelegate? = nil) async throws -> (Data, URLResponse) {
-        return try await original.data(from: url, delegate: delegate)
+        if #available(macOS 12.0, iOS 15.0, tvOS 15.0, watchOS 8.0, *) {
+            return try await original.data(from: url, delegate: delegate)
+        } else {
+            return try await data(for: URLRequest(url: url), delegate: delegate)
+        }
     }
 }