666 lines
20 KiB
JavaScript
666 lines
20 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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const {helper, assert, debugError} = require('./helper');
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const path = require('path');
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const EVALUATION_SCRIPT_URL = '__puppeteer_evaluation_script__';
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const SOURCE_URL_REGEX = /^[\040\t]*\/\/[@#] sourceURL=\s*(\S*?)\s*$/m;
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function createJSHandle(context, remoteObject) {
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const frame = context.frame();
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if (remoteObject.subtype === 'node' && frame) {
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const frameManager = frame._frameManager;
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return new ElementHandle(context, context._client, remoteObject, frameManager.page(), frameManager);
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}
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return new JSHandle(context, context._client, remoteObject);
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}
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class ExecutionContext {
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/**
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* @param {!Puppeteer.CDPSession} client
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* @param {!Protocol.Runtime.ExecutionContextDescription} contextPayload
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* @param {?Puppeteer.Frame} frame
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*/
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constructor(client, contextPayload, frame) {
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this._client = client;
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this._frame = frame;
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this._contextId = contextPayload.id;
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this._isDefault = contextPayload.auxData ? !!contextPayload.auxData['isDefault'] : false;
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}
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/**
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* @return {?Puppeteer.Frame}
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*/
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frame() {
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return this._frame;
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}
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/**
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* @param {Function|string} pageFunction
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* @param {...*} args
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* @return {!Promise<(!Object|undefined)>}
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*/
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async evaluate(pageFunction, ...args) {
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const handle = await this.evaluateHandle(pageFunction, ...args);
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const result = await handle.jsonValue().catch(error => {
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if (error.message.includes('Object reference chain is too long'))
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return;
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if (error.message.includes('Object couldn\'t be returned by value'))
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return;
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throw error;
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});
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await handle.dispose();
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return result;
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}
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/**
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* @param {Function|string} pageFunction
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* @param {...*} args
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* @return {!Promise<!JSHandle>}
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*/
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async evaluateHandle(pageFunction, ...args) {
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const suffix = `//# sourceURL=${EVALUATION_SCRIPT_URL}`;
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if (helper.isString(pageFunction)) {
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const contextId = this._contextId;
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const expression = /** @type {string} */ (pageFunction);
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const expressionWithSourceUrl = SOURCE_URL_REGEX.test(expression) ? expression : expression + '\n' + suffix;
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const {exceptionDetails, result: remoteObject} = await this._client.send('Runtime.evaluate', {
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expression: expressionWithSourceUrl,
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contextId,
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returnByValue: false,
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awaitPromise: true,
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userGesture: true
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}).catch(rewriteError);
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if (exceptionDetails)
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throw new Error('Evaluation failed: ' + helper.getExceptionMessage(exceptionDetails));
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return createJSHandle(this, remoteObject);
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}
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if (typeof pageFunction !== 'function')
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throw new Error('The following is not a function: ' + pageFunction);
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let functionText = pageFunction.toString();
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try {
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new Function('(' + functionText + ')');
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} catch (e1) {
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// This means we might have a function shorthand. Try another
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// time prefixing 'function '.
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if (functionText.startsWith('async '))
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functionText = 'async function ' + functionText.substring('async '.length);
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else
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functionText = 'function ' + functionText;
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try {
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new Function('(' + functionText + ')');
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} catch (e2) {
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// We tried hard to serialize, but there's a weird beast here.
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throw new Error('Passed function is not well-serializable!');
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}
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}
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const { exceptionDetails, result: remoteObject } = await this._client.send('Runtime.callFunctionOn', {
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functionDeclaration: functionText + '\n' + suffix + '\n',
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executionContextId: this._contextId,
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arguments: args.map(convertArgument.bind(this)),
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returnByValue: false,
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awaitPromise: true,
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userGesture: true
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}).catch(rewriteError);
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if (exceptionDetails)
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throw new Error('Evaluation failed: ' + helper.getExceptionMessage(exceptionDetails));
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return createJSHandle(this, remoteObject);
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/**
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* @param {*} arg
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* @return {*}
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* @this {ExecutionContext}
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*/
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function convertArgument(arg) {
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if (Object.is(arg, -0))
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return { unserializableValue: '-0' };
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if (Object.is(arg, Infinity))
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return { unserializableValue: 'Infinity' };
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if (Object.is(arg, -Infinity))
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return { unserializableValue: '-Infinity' };
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if (Object.is(arg, NaN))
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return { unserializableValue: 'NaN' };
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const objectHandle = arg && (arg instanceof JSHandle) ? arg : null;
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if (objectHandle) {
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if (objectHandle._context !== this)
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throw new Error('JSHandles can be evaluated only in the context they were created!');
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if (objectHandle._disposed)
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throw new Error('JSHandle is disposed!');
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if (objectHandle._remoteObject.unserializableValue)
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return { unserializableValue: objectHandle._remoteObject.unserializableValue };
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if (!objectHandle._remoteObject.objectId)
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return { value: objectHandle._remoteObject.value };
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return { objectId: objectHandle._remoteObject.objectId };
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}
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return { value: arg };
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}
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/**
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* @param {!Error} error
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* @return {!Protocol.Runtime.evaluateReturnValue}
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*/
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function rewriteError(error) {
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if (error.message.endsWith('Cannot find context with specified id'))
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throw new Error('Execution context was destroyed, most likely because of a navigation.');
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throw error;
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}
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}
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/**
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* @param {!JSHandle} prototypeHandle
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* @return {!Promise<!JSHandle>}
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*/
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async queryObjects(prototypeHandle) {
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assert(!prototypeHandle._disposed, 'Prototype JSHandle is disposed!');
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assert(prototypeHandle._remoteObject.objectId, 'Prototype JSHandle must not be referencing primitive value');
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const response = await this._client.send('Runtime.queryObjects', {
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prototypeObjectId: prototypeHandle._remoteObject.objectId
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});
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return createJSHandle(this, response.objects);
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}
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}
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class JSHandle {
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/**
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* @param {!ExecutionContext} context
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* @param {!Puppeteer.CDPSession} client
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* @param {!Protocol.Runtime.RemoteObject} remoteObject
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*/
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constructor(context, client, remoteObject) {
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this._context = context;
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this._client = client;
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this._remoteObject = remoteObject;
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this._disposed = false;
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}
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/**
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* @return {!ExecutionContext}
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*/
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executionContext() {
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return this._context;
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}
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/**
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* @param {string} propertyName
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* @return {!Promise<?JSHandle>}
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*/
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async getProperty(propertyName) {
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const objectHandle = await this._context.evaluateHandle((object, propertyName) => {
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const result = {__proto__: null};
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result[propertyName] = object[propertyName];
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return result;
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}, this, propertyName);
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const properties = await objectHandle.getProperties();
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const result = properties.get(propertyName) || null;
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await objectHandle.dispose();
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return result;
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}
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/**
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* @return {!Promise<!Map<string, !JSHandle>>}
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*/
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async getProperties() {
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const response = await this._client.send('Runtime.getProperties', {
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objectId: this._remoteObject.objectId,
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ownProperties: true
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});
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const result = new Map();
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for (const property of response.result) {
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if (!property.enumerable)
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continue;
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result.set(property.name, createJSHandle(this._context, property.value));
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}
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return result;
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}
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/**
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* @return {!Promise<?Object>}
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*/
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async jsonValue() {
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if (this._remoteObject.objectId) {
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const response = await this._client.send('Runtime.callFunctionOn', {
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functionDeclaration: 'function() { return this; }',
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objectId: this._remoteObject.objectId,
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returnByValue: true,
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awaitPromise: true,
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});
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return helper.valueFromRemoteObject(response.result);
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}
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return helper.valueFromRemoteObject(this._remoteObject);
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}
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/**
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* @return {?Puppeteer.ElementHandle}
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*/
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asElement() {
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return null;
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}
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async dispose() {
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if (this._disposed)
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return;
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this._disposed = true;
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await helper.releaseObject(this._client, this._remoteObject);
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}
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/**
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* @override
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* @return {string}
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*/
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toString() {
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if (this._remoteObject.objectId) {
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const type = this._remoteObject.subtype || this._remoteObject.type;
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return 'JSHandle@' + type;
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}
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return 'JSHandle:' + helper.valueFromRemoteObject(this._remoteObject);
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}
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}
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class ElementHandle extends JSHandle {
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/**
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* @param {!Puppeteer.ExecutionContext} context
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* @param {!Puppeteer.CDPSession} client
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* @param {!Protocol.Runtime.RemoteObject} remoteObject
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* @param {!Puppeteer.Page} page
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* @param {!Puppeteer.FrameManager} frameManager
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*/
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constructor(context, client, remoteObject, page, frameManager) {
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super(context, client, remoteObject);
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this._client = client;
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this._remoteObject = remoteObject;
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this._page = page;
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this._frameManager = frameManager;
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this._disposed = false;
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}
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/**
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* @override
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* @return {?ElementHandle}
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*/
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asElement() {
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return this;
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}
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/**
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* @return {!Promise<?Puppeteer.Frame>}
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*/
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async contentFrame() {
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const nodeInfo = await this._client.send('DOM.describeNode', {
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objectId: this._remoteObject.objectId
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});
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if (typeof nodeInfo.node.frameId !== 'string')
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return null;
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return this._frameManager.frame(nodeInfo.node.frameId);
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}
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async _scrollIntoViewIfNeeded() {
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const error = await this.executionContext().evaluate(async(element, pageJavascriptEnabled) => {
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if (!element.isConnected)
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return 'Node is detached from document';
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if (element.nodeType !== Node.ELEMENT_NODE)
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return 'Node is not of type HTMLElement';
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// force-scroll if page's javascript is disabled.
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if (!pageJavascriptEnabled) {
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element.scrollIntoView({block: 'center', inline: 'center', behavior: 'instant'});
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return false;
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}
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const visibleRatio = await new Promise(resolve => {
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const observer = new IntersectionObserver(entries => {
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resolve(entries[0].intersectionRatio);
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observer.disconnect();
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});
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observer.observe(element);
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});
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if (visibleRatio !== 1.0)
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element.scrollIntoView({block: 'center', inline: 'center', behavior: 'instant'});
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return false;
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}, this, this._page._javascriptEnabled);
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if (error)
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throw new Error(error);
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}
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/**
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* @return {!Promise<!{x: number, y: number}>}
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*/
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async _clickablePoint() {
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const result = await this._client.send('DOM.getContentQuads', {
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objectId: this._remoteObject.objectId
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}).catch(debugError);
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if (!result || !result.quads.length)
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throw new Error('Node is either not visible or not an HTMLElement');
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// Filter out quads that have too small area to click into.
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const quads = result.quads.map(quad => this._fromProtocolQuad(quad)).filter(quad => computeQuadArea(quad) > 1);
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if (!quads.length)
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throw new Error('Node is either not visible or not an HTMLElement');
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// Return the middle point of the first quad.
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const quad = quads[0];
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let x = 0;
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let y = 0;
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for (const point of quad) {
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x += point.x;
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y += point.y;
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}
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return {
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x: x / 4,
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y: y / 4
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};
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}
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/**
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* @return {!Promise<void|Protocol.DOM.getBoxModelReturnValue>}
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*/
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_getBoxModel() {
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return this._client.send('DOM.getBoxModel', {
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objectId: this._remoteObject.objectId
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}).catch(error => debugError(error));
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}
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/**
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* @param {!Array<number>} quad
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* @return {!Array<{x: number, y: number}>}
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*/
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_fromProtocolQuad(quad) {
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return [
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{x: quad[0], y: quad[1]},
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{x: quad[2], y: quad[3]},
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{x: quad[4], y: quad[5]},
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{x: quad[6], y: quad[7]}
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];
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}
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async hover() {
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await this._scrollIntoViewIfNeeded();
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const {x, y} = await this._clickablePoint();
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await this._page.mouse.move(x, y);
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}
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/**
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* @param {!{delay?: number, button?: "left"|"right"|"middle", clickCount?: number}=} options
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*/
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async click(options) {
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await this._scrollIntoViewIfNeeded();
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const {x, y} = await this._clickablePoint();
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await this._page.mouse.click(x, y, options);
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}
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/**
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* @param {!Array<string>} filePaths
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*/
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async uploadFile(...filePaths) {
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const files = filePaths.map(filePath => path.resolve(filePath));
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const objectId = this._remoteObject.objectId;
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await this._client.send('DOM.setFileInputFiles', { objectId, files });
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}
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async tap() {
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await this._scrollIntoViewIfNeeded();
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const {x, y} = await this._clickablePoint();
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await this._page.touchscreen.tap(x, y);
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}
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async focus() {
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await this.executionContext().evaluate(element => element.focus(), this);
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}
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/**
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* @param {string} text
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* @param {{delay: (number|undefined)}=} options
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*/
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async type(text, options) {
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await this.focus();
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await this._page.keyboard.type(text, options);
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}
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/**
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* @param {string} key
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* @param {!{delay?: number, text?: string}=} options
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*/
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async press(key, options) {
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await this.focus();
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await this._page.keyboard.press(key, options);
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}
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/**
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* @return {!Promise<?{x: number, y: number, width: number, height: number}>}
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*/
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async boundingBox() {
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const result = await this._getBoxModel();
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if (!result)
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return null;
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const quad = result.model.border;
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const x = Math.min(quad[0], quad[2], quad[4], quad[6]);
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const y = Math.min(quad[1], quad[3], quad[5], quad[7]);
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const width = Math.max(quad[0], quad[2], quad[4], quad[6]) - x;
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const height = Math.max(quad[1], quad[3], quad[5], quad[7]) - y;
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return {x, y, width, height};
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}
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/**
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* @return {!Promise<?BoxModel>}
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*/
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async boxModel() {
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const result = await this._getBoxModel();
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if (!result)
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return null;
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const {content, padding, border, margin, width, height} = result.model;
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return {
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content: this._fromProtocolQuad(content),
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padding: this._fromProtocolQuad(padding),
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border: this._fromProtocolQuad(border),
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margin: this._fromProtocolQuad(margin),
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width,
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height
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};
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}
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/**
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*
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* @param {!Object=} options
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* @returns {!Promise<string|!Buffer>}
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*/
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async screenshot(options = {}) {
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let needsViewportReset = false;
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let boundingBox = await this.boundingBox();
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assert(boundingBox, 'Node is either not visible or not an HTMLElement');
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const viewport = this._page.viewport();
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if (viewport && (boundingBox.width > viewport.width || boundingBox.height > viewport.height)) {
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const newViewport = {
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width: Math.max(viewport.width, Math.ceil(boundingBox.width)),
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height: Math.max(viewport.height, Math.ceil(boundingBox.height)),
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};
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await this._page.setViewport(Object.assign({}, viewport, newViewport));
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needsViewportReset = true;
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}
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await this._scrollIntoViewIfNeeded();
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boundingBox = await this.boundingBox();
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assert(boundingBox, 'Node is either not visible or not an HTMLElement');
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assert(boundingBox.width !== 0, 'Node has 0 width.');
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assert(boundingBox.height !== 0, 'Node has 0 height.');
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const { layoutViewport: { pageX, pageY } } = await this._client.send('Page.getLayoutMetrics');
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const clip = Object.assign({}, boundingBox);
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clip.x += pageX;
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clip.y += pageY;
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const imageData = await this._page.screenshot(Object.assign({}, {
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clip
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}, options));
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if (needsViewportReset)
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await this._page.setViewport(viewport);
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return imageData;
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}
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/**
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* @param {string} selector
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* @return {!Promise<?ElementHandle>}
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*/
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async $(selector) {
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const handle = await this.executionContext().evaluateHandle(
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(element, selector) => element.querySelector(selector),
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this, selector
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);
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|
const element = handle.asElement();
|
|
if (element)
|
|
return element;
|
|
await handle.dispose();
|
|
return null;
|
|
}
|
|
|
|
/**
|
|
* @param {string} selector
|
|
* @return {!Promise<!Array<!ElementHandle>>}
|
|
*/
|
|
async $$(selector) {
|
|
const arrayHandle = await this.executionContext().evaluateHandle(
|
|
(element, selector) => element.querySelectorAll(selector),
|
|
this, selector
|
|
);
|
|
const properties = await arrayHandle.getProperties();
|
|
await arrayHandle.dispose();
|
|
const result = [];
|
|
for (const property of properties.values()) {
|
|
const elementHandle = property.asElement();
|
|
if (elementHandle)
|
|
result.push(elementHandle);
|
|
}
|
|
return result;
|
|
}
|
|
|
|
/**
|
|
* @param {string} selector
|
|
* @param {Function|String} pageFunction
|
|
* @param {!Array<*>} args
|
|
* @return {!Promise<(!Object|undefined)>}
|
|
*/
|
|
async $eval(selector, pageFunction, ...args) {
|
|
const elementHandle = await this.$(selector);
|
|
if (!elementHandle)
|
|
throw new Error(`Error: failed to find element matching selector "${selector}"`);
|
|
const result = await this.executionContext().evaluate(pageFunction, elementHandle, ...args);
|
|
await elementHandle.dispose();
|
|
return result;
|
|
}
|
|
|
|
/**
|
|
* @param {string} selector
|
|
* @param {Function|String} pageFunction
|
|
* @param {!Array<*>} args
|
|
* @return {!Promise<(!Object|undefined)>}
|
|
*/
|
|
async $$eval(selector, pageFunction, ...args) {
|
|
const arrayHandle = await this.executionContext().evaluateHandle(
|
|
(element, selector) => Array.from(element.querySelectorAll(selector)),
|
|
this, selector
|
|
);
|
|
|
|
const result = await this.executionContext().evaluate(pageFunction, arrayHandle, ...args);
|
|
await arrayHandle.dispose();
|
|
return result;
|
|
}
|
|
|
|
/**
|
|
* @param {string} expression
|
|
* @return {!Promise<!Array<!ElementHandle>>}
|
|
*/
|
|
async $x(expression) {
|
|
const arrayHandle = await this.executionContext().evaluateHandle(
|
|
(element, expression) => {
|
|
const document = element.ownerDocument || element;
|
|
const iterator = document.evaluate(expression, element, null, XPathResult.ORDERED_NODE_ITERATOR_TYPE);
|
|
const array = [];
|
|
let item;
|
|
while ((item = iterator.iterateNext()))
|
|
array.push(item);
|
|
return array;
|
|
},
|
|
this, expression
|
|
);
|
|
const properties = await arrayHandle.getProperties();
|
|
await arrayHandle.dispose();
|
|
const result = [];
|
|
for (const property of properties.values()) {
|
|
const elementHandle = property.asElement();
|
|
if (elementHandle)
|
|
result.push(elementHandle);
|
|
}
|
|
return result;
|
|
}
|
|
|
|
/**
|
|
* @returns {!Promise<boolean>}
|
|
*/
|
|
isIntersectingViewport() {
|
|
return this.executionContext().evaluate(async element => {
|
|
const visibleRatio = await new Promise(resolve => {
|
|
const observer = new IntersectionObserver(entries => {
|
|
resolve(entries[0].intersectionRatio);
|
|
observer.disconnect();
|
|
});
|
|
observer.observe(element);
|
|
});
|
|
return visibleRatio > 0;
|
|
}, this);
|
|
}
|
|
}
|
|
|
|
function computeQuadArea(quad) {
|
|
// Compute sum of all directed areas of adjacent triangles
|
|
// https://en.wikipedia.org/wiki/Polygon#Simple_polygons
|
|
let area = 0;
|
|
for (let i = 0; i < quad.length; ++i) {
|
|
const p1 = quad[i];
|
|
const p2 = quad[(i + 1) % quad.length];
|
|
area += (p1.x * p2.y - p2.x * p1.y) / 2;
|
|
}
|
|
return Math.abs(area);
|
|
}
|
|
|
|
/**
|
|
* @typedef {Object} BoxModel
|
|
* @property {!Array<!{x: number, y: number}>} content
|
|
* @property {!Array<!{x: number, y: number}>} padding
|
|
* @property {!Array<!{x: number, y: number}>} border
|
|
* @property {!Array<!{x: number, y: number}>} margin
|
|
* @property {number} width
|
|
* @property {number} height
|
|
*/
|
|
|
|
helper.tracePublicAPI(ElementHandle);
|
|
helper.tracePublicAPI(JSHandle);
|
|
helper.tracePublicAPI(ExecutionContext);
|
|
|
|
module.exports = {ExecutionContext, JSHandle, ElementHandle, createJSHandle, EVALUATION_SCRIPT_URL};
|