;(function() {
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if (window.WebViewJavascriptBridge) { return }
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var messagingIframe
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var sendMessageQueue = []
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var receiveMessageQueue = []
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var messageHandlers = {}
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var MESSAGE_SEPARATOR = '__WVJB_MESSAGE_SEPERATOR__'
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var CUSTOM_PROTOCOL_SCHEME = 'wvjbscheme'
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var QUEUE_HAS_MESSAGE = '__WVJB_QUEUE_MESSAGE__'
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var responseCallbacks = {}
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var uniqueId = 1
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function _createQueueReadyIframe(doc) {
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messagingIframe = doc.createElement('iframe')
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messagingIframe.style.display = 'none'
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doc.documentElement.appendChild(messagingIframe)
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}
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function init(messageHandler) {
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if (WebViewJavascriptBridge._messageHandler) { throw new Error('WebViewJavascriptBridge.init called twice') }
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WebViewJavascriptBridge._messageHandler = messageHandler
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var receivedMessages = receiveMessageQueue
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receiveMessageQueue = null
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for (var i=0; i<receivedMessages.length; i++) {
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_dispatchMessageFromObjC(receivedMessages[i])
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}
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}
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function send(data, responseCallback) {
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_doSend({ data:data }, responseCallback)
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}
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function registerHandler(handlerName, handler) {
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messageHandlers[handlerName] = handler
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}
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function callHandler(handlerName, data, responseCallback) {
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_doSend({ data:data, handlerName:handlerName }, responseCallback)
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}
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function _doSend(message, responseCallback) {
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if (responseCallback) {
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var callbackId = 'js_cb_'+(uniqueId++)
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responseCallbacks[callbackId] = responseCallback
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message['callbackId'] = callbackId
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}
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sendMessageQueue.push(JSON.stringify(message))
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messagingIframe.src = CUSTOM_PROTOCOL_SCHEME + '://' + QUEUE_HAS_MESSAGE
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}
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function _fetchQueue() {
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var messageQueueString = sendMessageQueue.join(MESSAGE_SEPARATOR)
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sendMessageQueue = []
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return messageQueueString
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}
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function _dispatchMessageFromObjC(messageJSON) {
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setTimeout(function _timeoutDispatchMessageFromObjC() {
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var message = JSON.parse(messageJSON)
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var messageHandler
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if (message.responseId) {
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var responseCallback = responseCallbacks[message.responseId]
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responseCallback(message.error, message.responseData)
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delete responseCallbacks[message.responseId]
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} else {
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var response
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if (message.callbackId) {
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var callbackResponseId = message.callbackId
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response = {
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respondWith: function(responseData) {
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_doSend({ responseId:callbackResponseId, responseData:responseData })
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},
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respondWithError: function(error) {
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_doSend({ responseId:callbackResponseId, error:error })
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}
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}
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}
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var handler = WebViewJavascriptBridge._messageHandler
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if (message.handlerName) {
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handler = messageHandlers[message.handlerName]
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}
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try {
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handler(message.data, response)
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} catch(exception) {
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console.log("WebViewJavascriptBridge: WARNING: javascript handler threw.", message, exception)
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}
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}
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})
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}
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function _handleMessageFromObjC(messageJSON) {
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if (receiveMessageQueue) {
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receiveMessageQueue.push(messageJSON)
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} else {
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_dispatchMessageFromObjC(messageJSON)
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}
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}
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window.WebViewJavascriptBridge = {
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init: init,
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send: send,
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registerHandler: registerHandler,
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callHandler: callHandler,
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_fetchQueue: _fetchQueue,
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_handleMessageFromObjC: _handleMessageFromObjC
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}
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var doc = document
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_createQueueReadyIframe(doc)
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var readyEvent = doc.createEvent('Events')
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readyEvent.initEvent('WebViewJavascriptBridgeReady')
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readyEvent.bridge = WebViewJavascriptBridge
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doc.dispatchEvent(readyEvent)
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})();
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