Remove Starscream Dependency and bump minimum support platform (#11)

* Remove Starscream

* Bump swift-tools-version to 5.5

Package.swift

@@ -1,23 +1,27 @@
-// swift-tools-version:5.3
+// swift-tools-version:5.5
 // The swift-tools-version declares the minimum version of Swift required to build this package.
 
 import PackageDescription
 
 let package = Package(
   name: "Realtime",
+  platforms: [
+    .iOS(.v13),
+    .macCatalyst(.v13),
+    .macOS(.v10_15),
+    .watchOS(.v6),
+    .tvOS(.v13),
+  ],
   products: [
     .library(
       name: "Realtime",
       targets: ["Realtime"]
     )
   ],
-  dependencies: [
-    .package(url: "https://github.com/daltoniam/Starscream.git", from: "3.0.0")
-  ],
   targets: [
     .target(
       name: "Realtime",
-      dependencies: ["Starscream"]
+      dependencies: []
     ),
     .testTarget(
       name: "RealtimeTests",

Sources/Realtime/RealtimeClient.swift

@@ -163,11 +163,7 @@ public class RealtimeClient: TransportDelegate {
     endPointUrl = RealtimeClient.buildEndpointUrl(
       endpoint: endPoint,
       params: params)
-    if #available(macOS 10.15, iOS 13, watchOS 6, tvOS 13, *) {
-      transport = URLSessionTransport(url: endPointUrl)
-    } else {
-      transport = StarscreamTransport(url: endPointUrl)
-    }
+    transport = URLSessionTransport(url: endPointUrl)
     self.params = params
     self.endPoint = endPoint
 

Sources/Realtime/Transport.swift

@@ -19,7 +19,6 @@
 // THE SOFTWARE.
 
 import Foundation
-import Starscream
 
 #if canImport(FoundationNetworking)
   import FoundationNetworking
@@ -279,96 +278,3 @@ public class URLSessionTransport: NSObject, Transport, URLSessionWebSocketDelega
     delegate?.onClose(code: RealtimeClient.CloseCode.abnormal.rawValue)
   }
 }
-
-public class StarscreamTransport: NSObject, Transport, WebSocketDelegate {
-  /// The URL to connect to
-  private let url: URL
-
-  /// The underlying Starscream WebSocket that data is transfered over.
-  private var socket: WebSocket?
-
-  /**
-     Initializes a `Transport` layer built using Starscream's WebSocket, which is available for
-     previous iOS targets back to iOS 10.
-
-     If you are targeting iOS 13 or later, then you do not need to use this transport layer unless
-     you specifically prefer using Starscream as the underlying Socket connection.
-
-     Example:
-
-     ```swift
-     let url = URL("wss://example.com/socket")
-     let transport: Transport = StarscreamTransport(url: url)
-     ```
-
-     - parameter url: URL to connect to
-     */
-  public init(url: URL) {
-    self.url = url
-    super.init()
-  }
-
-  // MARK: - Transport
-
-  public var readyState: TransportReadyState = .closed
-  public var delegate: TransportDelegate?
-
-  public func connect() {
-    // Set the trasport state as connecting
-    readyState = .connecting
-
-    let socket = WebSocket(url: url)
-    socket.delegate = self
-    socket.connect()
-
-    self.socket = socket
-  }
-
-  public func disconnect(code: Int, reason _: String?) {
-    /*
-         TODO:
-         1. Provide a "strict" mode that fails if an invalid close code is given
-         2. If strict mode is disabled, default to CloseCode.invalid
-         3. Provide default .normalClosure function
-         */
-    guard
-      let closeCode = CloseCode(rawValue: UInt16(code))
-    else {
-      fatalError("Could not create a CloseCode with invalid code: [\(code)].")
-    }
-
-    readyState = .closing
-    socket?.disconnect(closeCode: closeCode.rawValue)
-  }
-
-  public func send(data: Data) {
-    socket?.write(data: data)
-  }
-
-  // MARK: - WebSocketDelegate
-
-  public func websocketDidConnect(socket _: WebSocketClient) {
-    readyState = .open
-    delegate?.onOpen()
-  }
-
-  public func websocketDidDisconnect(socket _: WebSocketClient, error: Error?) {
-    let closeCode = (error as? WSError)?.code ?? RealtimeClient.CloseCode.abnormal.rawValue
-    // Set the state of the Transport to closed
-    readyState = .closed
-
-    // Inform the Transport's delegate that an error occurred.
-    if let safeError = error { delegate?.onError(error: safeError) }
-
-    // An abnormal error is results in an abnormal closure, such as internet getting dropped
-    // so inform the delegate that the Transport has closed abnormally. This will kick off
-    // the reconnect logic.
-    delegate?.onClose(code: closeCode)
-  }
-
-  public func websocketDidReceiveMessage(socket _: WebSocketClient, text: String) {
-    delegate?.onMessage(message: text)
-  }
-
-  public func websocketDidReceiveData(socket _: WebSocketClient, data _: Data) { /* no-op */  }
-}