130 lines
3.4 KiB
JavaScript
130 lines
3.4 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 utils = module.exports = {
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/**
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* @param {!Page} page
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* @param {string} frameId
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* @param {string} url
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*/
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attachFrame: async function(page, frameId, url) {
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await page.evaluate(attachFrame, frameId, url);
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function attachFrame(frameId, url) {
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const frame = document.createElement('iframe');
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frame.src = url;
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frame.id = frameId;
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document.body.appendChild(frame);
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return new Promise(x => frame.onload = x);
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}
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},
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/**
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* @param {!Page} page
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* @param {string} frameId
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*/
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detachFrame: async function(page, frameId) {
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await page.evaluate(detachFrame, frameId);
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function detachFrame(frameId) {
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const frame = document.getElementById(frameId);
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frame.remove();
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}
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},
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/**
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* @param {!Page} page
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* @param {string} frameId
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* @param {string} url
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*/
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navigateFrame: async function(page, frameId, url) {
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await page.evaluate(navigateFrame, frameId, url);
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function navigateFrame(frameId, url) {
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const frame = document.getElementById(frameId);
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frame.src = url;
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return new Promise(x => frame.onload = x);
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}
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},
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/**
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* @param {!Frame} frame
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* @param {string=} indentation
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* @return {string}
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*/
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dumpFrames: function(frame, indentation) {
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indentation = indentation || '';
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let result = indentation + frame.url().replace(/:\d{4}\//, ':<PORT>/');
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for (const child of frame.childFrames())
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result += '\n' + utils.dumpFrames(child, ' ' + indentation);
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return result;
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},
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/**
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* @param {!EventEmitter} emitter
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* @param {string} eventName
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* @param {number=} eventCount
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* @return {!Promise<!Object>}
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*/
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waitForEvents: function(emitter, eventName, eventCount = 1) {
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let fulfill;
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const promise = new Promise(x => fulfill = x);
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emitter.on(eventName, onEvent);
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return promise;
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function onEvent(event) {
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--eventCount;
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if (eventCount)
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return;
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emitter.removeListener(eventName, onEvent);
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fulfill(event);
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}
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},
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/**
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* @param {!Buffer} pdfBuffer
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* @return {!Promise<!Array<!Object>>}
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*/
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getPDFPages: async function(pdfBuffer) {
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const PDFJS = require('pdfjs-dist');
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PDFJS.disableWorker = true;
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const data = new Uint8Array(pdfBuffer);
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const doc = await PDFJS.getDocument(data);
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const pages = [];
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for (let i = 0; i < doc.numPages; ++i) {
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const page = await doc.getPage(i + 1);
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const viewport = page.getViewport(1);
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// Viewport width and height is in PDF points, which is
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// 1/72 of an inch.
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pages.push({
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width: viewport.width / 72,
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height: viewport.height / 72,
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});
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page.cleanup();
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}
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doc.cleanup();
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return pages;
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},
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/**
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* @param {number} px
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* @return {number}
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*/
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cssPixelsToInches: function(px) {
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return px / 96;
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},
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};
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