feat(apple): background push through APNs

src/SDK/Language/Apple.php

@@ -55,6 +55,11 @@ public function getFiles(): array
                 'destination'   => '/Tests/{{ spec.info.title | caseUcfirst}}Tests/Tests.swift',
                 'template'      => 'swift/Tests/Tests.swift.twig',
             ],
+            [
+                'scope'         => 'default',
+                'destination'   => '/Tests/{{ spec.info.title | caseUcfirst}}Tests/PushTests.swift',
+                'template'      => 'apple/Tests/PushTests.swift.twig',
+            ],
             [
                 'scope'         => 'default',
                 'destination'   => '/Sources/{{ spec.info.title | caseUcfirst}}/Models/{{ spec.info.title | caseUcfirst}}Error.swift',
@@ -256,6 +261,11 @@ public function getFiles(): array
                 'destination'   => '/Sources/{{ spec.info.title | caseUcfirst}}/Services/Push.swift',
                 'template'      => '/apple/Sources/Services/Push.swift.twig',
             ],
+            [
+                'scope'         => 'default',
+                'destination'   => '/Sources/{{ spec.info.title | caseUcfirst}}/Services/PushServiceExtension.swift',
+                'template'      => '/apple/Sources/Services/PushServiceExtension.swift.twig',
+            ],
             [
                 'scope'         => 'default',
                 'destination'   => '/Sources/{{ spec.info.title | caseUcfirst}}/WebSockets/HTTPHandler.swift',

templates/apple/Sources/Client.swift.twig

@@ -367,6 +367,11 @@ open class Client {
         for (key, value) in self.headers.merging(headers, uniquingKeysWith: { $1 }) {
             request.headers.add(name: key, value: value)
         }
+        // NIO asks for "deflate, gzip" unless told otherwise, and some servers answer deflate with a raw
+        // stream it can't inflate. gzip is decoded the same everywhere.
+        if compression, !request.headers.contains(name: "accept-encoding") {
+            request.headers.add(name: "accept-encoding", value: "gzip")
+        }
 
         request.addDomainCookies()