632b90efae
This patch: - renames Page.Events.Exception in Page.Events.Error - dispatches an error which has a page stack as its message
380 lines
10 KiB
JavaScript
380 lines
10 KiB
JavaScript
/**
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* Copyright 2017 Google Inc. All rights reserved.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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var await = require('./utilities').await;
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var EventEmitter = require('events');
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var fs = require('fs');
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var path = require('path');
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var PageEvents = require('../lib/Page').Events;
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var noop = function() { };
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class WebPage {
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/**
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* @param {!Browser} browser
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* @param {string} scriptPath
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* @param {!Object=} options
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*/
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constructor(browser, scriptPath, options) {
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this._page = await(browser.newPage());
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this.settings = new WebPageSettings(this._page);
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options = options || {};
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options.settings = options.settings || {};
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if (options.settings.userAgent)
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this.settings.userAgent = options.settings.userAgent;
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if (options.viewportSize)
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await(this._page.setViewportSize(options.viewportSize));
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await(this._page.setInPageCallback('callPhantom', (...args) => this.onCallback.apply(null, args)));
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this.clipRect = options.clipRect || {left: 0, top: 0, width: 0, height: 0};
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this.onCallback = null;
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this.onConsoleMessage = null;
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this.onLoadFinished = null;
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this.onResourceError = null;
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this.onResourceReceived = null;
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this.onInitialized = null;
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this._deferEvaluate = false;
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this.libraryPath = path.dirname(scriptPath);
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this._onResourceRequestedCallback = undefined;
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this._onConfirmCallback = undefined;
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this._onAlertCallback = undefined;
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this._onError = noop;
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this._pageEvents = new AsyncEmitter(this._page);
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this._pageEvents.on(PageEvents.ResponseReceived, response => this._onResponseReceived(response));
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this._pageEvents.on(PageEvents.ResourceLoadingFailed, event => (this.onResourceError || noop).call(null, event));
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this._pageEvents.on(PageEvents.ConsoleMessage, msg => (this.onConsoleMessage || noop).call(null, msg));
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this._pageEvents.on(PageEvents.Confirm, message => this._onConfirm(message));
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this._pageEvents.on(PageEvents.Alert, message => this._onAlert(message));
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this._pageEvents.on(PageEvents.Dialog, dialog => this._onDialog(dialog));
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this._pageEvents.on(PageEvents.Error, error => (this._onError || noop).call(null, error.message, error.stack));
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}
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/**
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* @return {?function(!Object, !Request)}
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*/
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get onResourceRequested() {
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return this._onResourceRequestedCallback;
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}
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/**
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* @return {?function(!Object, !Request)} callback
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*/
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set onResourceRequested(callback) {
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this._onResourceRequestedCallback = callback;
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this._page.setRequestInterceptor(callback ? resourceInterceptor : null);
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/**
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* @param {!Request} request
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*/
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function resourceInterceptor(request) {
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var requestData = {
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url: request.url(),
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headers: request.headers()
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};
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callback(requestData, request);
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if (!request.handled())
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request.continue();
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}
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}
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_onResponseReceived(response) {
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if (!this.onResourceReceived)
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return;
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var headers = [];
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for (var key in response.headers) {
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headers.push({
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name: key,
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value: response.headers[key]
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});
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}
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response.headers = headers;
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this.onResourceReceived.call(null, response);
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}
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/**
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* @param {string} url
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* @param {function()} callback
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*/
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includeJs(url, callback) {
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this._page.addScriptTag(url).then(callback);
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}
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/**
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* @return {!{width: number, height: number}}
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*/
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get viewportSize() {
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return this._page.viewportSize();
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}
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/**
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* @return {!Object}
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*/
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get customHeaders() {
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return this._page.extraHTTPHeaders();
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}
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/**
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* @param {!Object} value
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*/
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set customHeaders(value) {
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await(this._page.setExtraHTTPHeaders(value));
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}
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/**
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* @param {string} filePath
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*/
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injectJs(filePath) {
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if (!fs.existsSync(filePath))
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filePath = path.resolve(this.libraryPath, filePath);
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if (!fs.existsSync(filePath))
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return false;
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await(this._page.injectFile(filePath));
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return true;
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}
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/**
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* @return {string}
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*/
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get plainText() {
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return await(this._page.plainText());
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}
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/**
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* @return {string}
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*/
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get title() {
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return await(this._page.title());
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}
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/**
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* @return {(function()|undefined)}
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*/
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get onError() {
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return this._onError;
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}
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/**
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* @param {(function()|undefined)} handler
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*/
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set onError(handler) {
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if (typeof handler !== 'function')
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handler = undefined;
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this._onError = handler;
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}
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/**
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* @return {(function()|undefined)}
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*/
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get onConfirm() {
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return this._onConfirmCallback;
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}
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/**
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* @param {function()} handler
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*/
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set onConfirm(handler) {
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if (typeof handler !== 'function')
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handler = undefined;
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this._onConfirmCallback = handler;
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}
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/**
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* @return {(function()|undefined)}
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*/
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get onAlert() {
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return this._onAlertCallback;
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}
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/**
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* @param {function()} handler
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*/
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set onAlert(handler) {
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if (typeof handler !== 'function')
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handler = undefined;
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this._onAlertCallback = handler;
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}
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/**
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* @param {!Dialog} dialog
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*/
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_onDialog(dialog) {
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if (dialog.type === 'alert' && this._onAlertCallback) {
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this._onAlertCallback.call(null, dialog.message());
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await(dialog.accept());
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} else if (dialog.type === 'confirm' && this._onConfirmCallback) {
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var result = this._onConfirmCallback.call(null, dialog.message());
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await(result ? dialog.accept() : dialog.dismiss());
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}
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}
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/**
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* @return {string}
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*/
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get url() {
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return await(this._page.url());
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}
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/**
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* @param {string} html
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*/
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set content(html) {
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await(this._page.setContent(html));
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}
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/**
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* @param {string} html
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* @param {function()=} callback
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*/
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open(url, callback) {
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console.assert(arguments.length <= 2, 'WebPage.open does not support METHOD and DATA arguments');
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this._deferEvaluate = true;
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if (typeof this.onInitialized === 'function')
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this.onInitialized();
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this._deferEvaluate = false;
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this._page.navigate(url).then(result => {
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var status = result ? 'success' : 'fail';
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if (!result) {
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this.onResourceError.call(null, {
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url,
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errorString: 'SSL handshake failed'
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});
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}
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if (this.onLoadFinished)
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this.onLoadFinished.call(null, status);
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if (callback)
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callback.call(null, status);
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});
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}
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/**
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* @param {!{width: number, height: number}} options
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*/
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set viewportSize(options) {
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await(this._page.setViewportSize(options));
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}
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/**
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* @param {function()} fun
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* @param {!Array<!Object>} args
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*/
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evaluate(fun, ...args) {
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if (this._deferEvaluate)
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return await(this._page.evaluateOnInitialized(fun, ...args));
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return await(this._page.evaluate(fun, ...args));
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}
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/**
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* {string} fileName
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*/
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render(fileName) {
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var clipRect = null;
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if (this.clipRect && (this.clipRect.left || this.clipRect.top || this.clipRect.width || this.clipRect.height)) {
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clipRect = {
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x: this.clipRect.left,
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y: this.clipRect.top,
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width: this.clipRect.width,
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height: this.clipRect.height
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};
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}
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if (fileName.endsWith('pdf')) {
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var options = {};
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var paperSize = this.paperSize || {};
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options.margin = paperSize.margin;
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options.format = paperSize.format;
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options.landscape = paperSize.orientation === 'landscape';
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options.width = paperSize.width;
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options.height = paperSize.height;
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await(this._page.printToPDF(fileName, options));
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} else {
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await(this._page.saveScreenshot(fileName, clipRect));
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}
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}
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release() {
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this._page.close();
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}
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close() {
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this._page.close();
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}
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}
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class WebPageSettings {
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/**
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* @param {!Page} page
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*/
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constructor(page) {
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this._page = page;
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}
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/**
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* @param {string} value
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*/
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set userAgent(value) {
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await(this._page.setUserAgentOverride(value));
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}
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/**
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* @return {string}
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*/
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get userAgent() {
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return this._page.userAgentOverride();
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}
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}
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// To prevent reenterability, eventemitters should emit events
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// only being in a consistent state.
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// This is not the case for 'ws' npm module: https://goo.gl/sy3dJY
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//
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// Since out phantomjs environment uses nested event loops, we
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// exploit this condition in 'ws', which probably never happens
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// in case of regular I/O.
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//
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// This class is a wrapper around EventEmitter which re-emits events asynchronously,
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// helping to overcome the issue.
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class AsyncEmitter extends EventEmitter {
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/**
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* @param {!Page} page
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*/
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constructor(page) {
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super();
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this._page = page;
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this._symbol = Symbol('AsyncEmitter');
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this.on('newListener', this._onListenerAdded);
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this.on('removeListener', this._onListenerRemoved);
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}
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_onListenerAdded(event, listener) {
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// Async listener calls original listener on next tick.
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var asyncListener = (...args) => {
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process.nextTick(() => listener.apply(null, args));
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};
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listener[this._symbol] = asyncListener;
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this._page.on(event, asyncListener);
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}
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_onListenerRemoved(event, listener) {
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this._page.removeListener(event, listener[this._symbol]);
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}
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}
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module.exports = WebPage;
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