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/*
Copyright 2015 XWebView
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/
import Foundation
import WebKit
public class XWVChannel : NSObject, WKScriptMessageHandler {
public let name: String
public let thread: NSThread!
public let queue: dispatch_queue_t!
private(set) public weak var webView: WKWebView?
var typeInfo: XWVMetaObject!
private var instances = [Int: XWVBindingObject]()
private var userScript: XWVUserScript?
private class var sequenceNumber: UInt {
struct sequence{
static var number: UInt = 0
}
return ++sequence.number
}
public convenience init(name: String?, webView: WKWebView) {
let queue = dispatch_queue_create(nil, DISPATCH_QUEUE_SERIAL)
self.init(name: name, webView:webView, queue: queue)
}
public init(name: String?, webView: WKWebView, queue: dispatch_queue_t) {
self.name = name ?? "\(XWVChannel.sequenceNumber)"
self.webView = webView
self.queue = queue
thread = nil
webView.prepareForPlugin()
}
public init(name: String?, webView: WKWebView, thread: NSThread) {
self.name = name ?? "\(XWVChannel.sequenceNumber)"
self.webView = webView
self.thread = thread
queue = nil
webView.prepareForPlugin()
}
public func bindPlugin(object: AnyObject, toNamespace namespace: String) -> XWVScriptObject? {
assert(typeInfo == nil, "<XWV> This channel already has a bound object")
guard let webView = webView else { return nil }
webView.configuration.userContentController.addScriptMessageHandler(self, name: name)
typeInfo = XWVMetaObject(plugin: object.dynamicType)
let plugin = XWVBindingObject(namespace: namespace, channel: self, object: object)
let stub = generateStub(plugin)
let script = WKUserScript(source: (object as? XWVScripting)?.javascriptStub?(stub) ?? stub,
injectionTime: WKUserScriptInjectionTime.AtDocumentStart,
forMainFrameOnly: true)
userScript = XWVUserScript(webView: webView, script: script)
instances[0] = plugin
return plugin as XWVScriptObject
}
public func unbind() {
assert(typeInfo != nil, "<XWV> Error: can't unbind inexistent plugin.")
instances.removeAll(keepCapacity: false)
webView?.configuration.userContentController.removeScriptMessageHandlerForName(name)
}
public func userContentController(userContentController: WKUserContentController, didReceiveScriptMessage message: WKScriptMessage) {
if let body = message.body as? [String: AnyObject], let opcode = body["$opcode"] as? String {
let target = (body["$target"] as? NSNumber)?.integerValue ?? 0
if let object = instances[target] {
if opcode == "-" {
if target == 0 {
// Dispose plugin
unbind()
print("<XWV> Plugin was disposed")
} else {
// Dispose instance
let object = instances.removeValueForKey(target)
assert(object != nil, "<XWV> Warning: bad instance id was received")
}
} else if let member = typeInfo[opcode] where member.isProperty {
// Update property
object.updateNativeProperty(opcode, withValue: body["$operand"])
} else if let member = typeInfo[opcode] where member.isMethod {
// Invoke method
let args = body["$operand"] as? [AnyObject]
object.invokeNativeMethod(opcode, withArguments: args)
} // else Unknown opcode
} else if opcode == "+" {
// Create instance
let args = body["$operand"] as? [AnyObject]
let namespace = "\(instances[0]!.namespace)[\(target)]"
instances[target] = XWVBindingObject(namespace: namespace, channel: self, arguments: args)
} // else Unknown opcode
} else if let obj = instances[0]!.object as? WKScriptMessageHandler {
// Plugin claims for raw messages
obj.userContentController(userContentController, didReceiveScriptMessage: message)
} else {
// discard unknown message
print("<XWV> WARNING: Unknown message: \(message.body)")
}
}
private func generateStub(object: XWVBindingObject) -> String {
func generateMethod(this: String, name: String, prebind: Bool) -> String {
let stub = "XWVPlugin.invokeNative.bind(\(this), '\(name)')"
return prebind ? "\(stub);" : "function(){return \(stub).apply(null, arguments);}"
}
var base = "null"
var prebind = true
if let member = typeInfo[""] {
if member.isInitializer {
base = "'\(member.type)'"
prebind = false
} else {
base = generateMethod("arguments.callee", name: "\(member.type)", prebind: false)
}
}
var stub = "(function(exports) {\n"
for (name, member) in typeInfo {
if member.isMethod && !name.isEmpty {
let method = generateMethod(prebind ? "exports" : "this", name: "\(name)\(member.type)", prebind: prebind)
stub += "exports.\(name) = \(method)\n"
} else if member.isProperty {
let value = object.serialize(object[name])
stub += "XWVPlugin.defineProperty(exports, '\(name)', \(value), \(member.setter != nil));\n"
}
}
stub += "})(XWVPlugin.createPlugin('\(name)', '\(object.namespace)', \(base)));\n\n"
return stub
}
}