265 lines
8.1 KiB
Swift
265 lines
8.1 KiB
Swift
//
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// SocketPacket.swift
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// Socket.IO-Client-Swift
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//
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// Created by Erik Little on 1/18/15.
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//
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// Permission is hereby granted, free of charge, to any person obtaining a copy
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// of this software and associated documentation files (the "Software"), to deal
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// in the Software without restriction, including without limitation the rights
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// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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// copies of the Software, and to permit persons to whom the Software is
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// furnished to do so, subject to the following conditions:
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//
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// The above copyright notice and this permission notice shall be included in
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// all copies or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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// THE SOFTWARE.
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//
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import Foundation
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struct SocketPacket {
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private let placeholders: Int
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private static let logType = "SocketPacket"
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let nsp: String
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let id: Int
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let type: PacketType
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enum PacketType: Int {
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case Connect, Disconnect, Event, Ack, Error, BinaryEvent, BinaryAck
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}
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var args: [AnyObject] {
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if type == .Event || type == .BinaryEvent && data.count != 0 {
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return Array(data.dropFirst())
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} else {
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return data
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}
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}
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var binary: [NSData]
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var data: [AnyObject]
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var description: String {
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return "SocketPacket {type: \(String(type.rawValue)); data: " +
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"\(String(data)); id: \(id); placeholders: \(placeholders); nsp: \(nsp)}"
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}
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var event: String {
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return String(data[0])
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}
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var packetString: String {
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return createPacketString()
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}
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init(type: SocketPacket.PacketType, data: [AnyObject] = [AnyObject](), id: Int = -1,
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nsp: String, placeholders: Int = 0, binary: [NSData] = [NSData]()) {
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self.data = data
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self.id = id
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self.nsp = nsp
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self.type = type
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self.placeholders = placeholders
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self.binary = binary
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}
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mutating func addData(data: NSData) -> Bool {
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if placeholders == binary.count {
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return true
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}
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binary.append(data)
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if placeholders == binary.count {
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fillInPlaceholders()
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return true
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} else {
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return false
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}
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}
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private func completeMessage(message: String, ack: Bool) -> String {
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let restOfMessage: String
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if data.count == 0 {
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return message + "[]"
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}
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do {
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let jsonSend = try NSJSONSerialization.dataWithJSONObject(data,
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options: NSJSONWritingOptions(rawValue: 0))
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guard let jsonString = String(data: jsonSend, encoding: NSUTF8StringEncoding) else {
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return "[]"
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}
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restOfMessage = jsonString
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} catch {
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DefaultSocketLogger.Logger.error("Error creating JSON object in SocketPacket.completeMessage",
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type: SocketPacket.logType)
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restOfMessage = "[]"
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}
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return message + restOfMessage
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}
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private func createAck() -> String {
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let message: String
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if type == .Ack {
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if nsp == "/" {
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message = "3\(id)"
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} else {
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message = "3\(nsp),\(id)"
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}
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} else {
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if nsp == "/" {
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message = "6\(binary.count)-\(id)"
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} else {
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message = "6\(binary.count)-\(nsp),\(id)"
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}
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}
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return completeMessage(message, ack: true)
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}
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private func createMessageForEvent() -> String {
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let message: String
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if type == .Event {
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if nsp == "/" {
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if id == -1 {
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message = "2"
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} else {
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message = "2\(id)"
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}
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} else {
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if id == -1 {
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message = "2\(nsp),"
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} else {
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message = "2\(nsp),\(id)"
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}
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}
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} else {
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if nsp == "/" {
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if id == -1 {
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message = "5\(binary.count)-"
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} else {
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message = "5\(binary.count)-\(id)"
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}
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} else {
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if id == -1 {
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message = "5\(binary.count)-\(nsp),"
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} else {
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message = "5\(binary.count)-\(nsp),\(id)"
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}
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}
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}
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return completeMessage(message, ack: false)
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}
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private func createPacketString() -> String {
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let str: String
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if type == .Event || type == .BinaryEvent {
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str = createMessageForEvent()
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} else {
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str = createAck()
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}
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return str
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}
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// Called when we have all the binary data for a packet
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// calls _fillInPlaceholders, which replaces placeholders with the
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// corresponding binary
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private mutating func fillInPlaceholders() {
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data = data.map(_fillInPlaceholders)
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}
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// Helper method that looks for placeholder strings
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// If object is a collection it will recurse
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// Returns the object if it is not a placeholder string or the corresponding
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// binary data
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private func _fillInPlaceholders(object: AnyObject) -> AnyObject {
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switch object {
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case let string as String where string["~~(\\d)"].groups() != nil:
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return binary[Int(string["~~(\\d)"].groups()![1])!]
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case let dict as NSDictionary:
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return dict.reduce(NSMutableDictionary(), combine: {cur, keyValue in
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cur[keyValue.0 as! NSCopying] = _fillInPlaceholders(keyValue.1)
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return cur
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})
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case let arr as [AnyObject]:
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return arr.map(_fillInPlaceholders)
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default:
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return object
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}
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}
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}
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extension SocketPacket {
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private static func findType(binCount: Int, ack: Bool) -> PacketType {
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switch binCount {
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case 0 where !ack:
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return .Event
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case 0 where ack:
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return .Ack
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case _ where !ack:
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return .BinaryEvent
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case _ where ack:
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return .BinaryAck
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default:
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return .Error
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}
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}
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static func packetFromEmit(items: [AnyObject], id: Int, nsp: String, ack: Bool) -> SocketPacket {
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let (parsedData, binary) = deconstructData(items)
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let packet = SocketPacket(type: findType(binary.count, ack: ack), data: parsedData,
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id: id, nsp: nsp, placeholders: -1, binary: binary)
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return packet
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}
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}
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private extension SocketPacket {
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// Recursive function that looks for NSData in collections
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static func shred(data: AnyObject, inout binary: [NSData]) -> AnyObject {
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let placeholder = ["_placeholder": true, "num": binary.count]
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switch data {
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case let bin as NSData:
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binary.append(bin)
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return placeholder
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case let arr as [AnyObject]:
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return arr.map({shred($0, binary: &binary)})
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case let dict as NSDictionary:
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return dict.reduce(NSMutableDictionary(), combine: {cur, keyValue in
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cur[keyValue.0 as! NSCopying] = shred(keyValue.1, binary: &binary)
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return cur
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})
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default:
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return data
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}
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}
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// Removes binary data from emit data
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// Returns a type containing the de-binaryed data and the binary
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static func deconstructData(data: [AnyObject]) -> ([AnyObject], [NSData]) {
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var binary = [NSData]()
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return (data.map({shred($0, binary: &binary)}), binary)
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}
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}
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