01d12b465c
Given that we already include the "Content-Disposition"-header filename, when it exists, it shouldn't hurt to also include the information from the "Content-Length"-header. For PDF documents opened via a URL, which should be a very common way for the PDF.js library to be used, this will[1] thus provide a way of getting the PDF filesize without having to wait for the `getDownloadInfo`-promise to resolve[2]. With these API improvements, we can also simplify the filesize handling in the `PDFDocumentProperties` class. --- [1] Assuming that the server is correctly configured, of course. [2] Since that's not *guaranteed* to happen in general, with e.g. `disableAutoFetch = true` set.
436 lines
13 KiB
JavaScript
436 lines
13 KiB
JavaScript
/* Copyright 2012 Mozilla Foundation
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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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import { createPromiseCapability, PDFDateString } from "pdfjs-lib";
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import {
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getPageSizeInches,
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getPDFFileNameFromURL,
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isPortraitOrientation,
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NullL10n,
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} from "./ui_utils.js";
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const DEFAULT_FIELD_CONTENT = "-";
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// See https://en.wikibooks.org/wiki/Lentis/Conversion_to_the_Metric_Standard_in_the_United_States
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const NON_METRIC_LOCALES = ["en-us", "en-lr", "my"];
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// Should use the format: `width x height`, in portrait orientation.
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// See https://en.wikipedia.org/wiki/Paper_size
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const US_PAGE_NAMES = {
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"8.5x11": "Letter",
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"8.5x14": "Legal",
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};
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const METRIC_PAGE_NAMES = {
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"297x420": "A3",
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"210x297": "A4",
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};
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function getPageName(size, isPortrait, pageNames) {
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const width = isPortrait ? size.width : size.height;
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const height = isPortrait ? size.height : size.width;
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return pageNames[`${width}x${height}`];
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}
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/**
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* @typedef {Object} PDFDocumentPropertiesOptions
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* @property {string} overlayName - Name/identifier for the overlay.
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* @property {Object} fields - Names and elements of the overlay's fields.
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* @property {HTMLDivElement} container - Div container for the overlay.
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* @property {HTMLButtonElement} closeButton - Button for closing the overlay.
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*/
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class PDFDocumentProperties {
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/**
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* @param {PDFDocumentPropertiesOptions} options
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* @param {OverlayManager} overlayManager - Manager for the viewer overlays.
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* @param {EventBus} eventBus - The application event bus.
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* @param {IL10n} l10n - Localization service.
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*/
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constructor(
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{ overlayName, fields, container, closeButton },
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overlayManager,
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eventBus,
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l10n = NullL10n
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) {
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this.overlayName = overlayName;
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this.fields = fields;
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this.container = container;
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this.overlayManager = overlayManager;
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this.l10n = l10n;
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this._reset();
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// Bind the event listener for the Close button.
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closeButton.addEventListener("click", this.close.bind(this));
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this.overlayManager.register(
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this.overlayName,
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this.container,
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this.close.bind(this)
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);
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eventBus._on("pagechanging", evt => {
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this._currentPageNumber = evt.pageNumber;
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});
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eventBus._on("rotationchanging", evt => {
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this._pagesRotation = evt.pagesRotation;
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});
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this._isNonMetricLocale = true; // The default viewer locale is 'en-us'.
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l10n.getLanguage().then(locale => {
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this._isNonMetricLocale = NON_METRIC_LOCALES.includes(locale);
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});
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}
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/**
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* Open the document properties overlay.
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*/
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open() {
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const freezeFieldData = data => {
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Object.defineProperty(this, "fieldData", {
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value: Object.freeze(data),
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writable: false,
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enumerable: true,
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configurable: true,
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});
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};
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Promise.all([
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this.overlayManager.open(this.overlayName),
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this._dataAvailableCapability.promise,
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]).then(() => {
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const currentPageNumber = this._currentPageNumber;
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const pagesRotation = this._pagesRotation;
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// If the document properties were previously fetched (for this PDF file),
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// just update the dialog immediately to avoid redundant lookups.
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if (
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this.fieldData &&
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currentPageNumber === this.fieldData._currentPageNumber &&
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pagesRotation === this.fieldData._pagesRotation
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) {
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this._updateUI();
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return;
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}
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// Get the document properties.
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this.pdfDocument
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.getMetadata()
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.then(
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({ info, metadata, contentDispositionFilename, contentLength }) => {
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return Promise.all([
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info,
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metadata,
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contentDispositionFilename || getPDFFileNameFromURL(this.url),
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this._parseFileSize(contentLength),
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this._parseDate(info.CreationDate),
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this._parseDate(info.ModDate),
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this.pdfDocument.getPage(currentPageNumber).then(pdfPage => {
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return this._parsePageSize(
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getPageSizeInches(pdfPage),
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pagesRotation
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);
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}),
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this._parseLinearization(info.IsLinearized),
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]);
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}
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)
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.then(
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([
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info,
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metadata,
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fileName,
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fileSize,
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creationDate,
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modDate,
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pageSize,
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isLinearized,
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]) => {
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freezeFieldData({
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fileName,
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fileSize,
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title: info.Title,
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author: info.Author,
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subject: info.Subject,
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keywords: info.Keywords,
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creationDate,
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modificationDate: modDate,
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creator: info.Creator,
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producer: info.Producer,
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version: info.PDFFormatVersion,
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pageCount: this.pdfDocument.numPages,
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pageSize,
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linearized: isLinearized,
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_currentPageNumber: currentPageNumber,
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_pagesRotation: pagesRotation,
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});
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this._updateUI();
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// Get the correct fileSize, since it may not have been available
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// or could potentially be wrong.
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return this.pdfDocument.getDownloadInfo().then(downloadInfo => {
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return this._parseFileSize(downloadInfo.length);
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});
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}
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)
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.then(fileSize => {
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if (fileSize === this.fieldData.fileSize) {
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return; // The fileSize has already been correctly set.
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}
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const data = Object.assign(Object.create(null), this.fieldData);
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data.fileSize = fileSize;
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freezeFieldData(data);
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this._updateUI();
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});
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});
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}
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/**
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* Close the document properties overlay.
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*/
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close() {
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this.overlayManager.close(this.overlayName);
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}
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/**
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* Set a reference to the PDF document and the URL in order
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* to populate the overlay fields with the document properties.
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* Note that the overlay will contain no information if this method
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* is not called.
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*
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* @param {PDFDocumentProxy} pdfDocument - A reference to the PDF document.
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* @param {string} url - The URL of the document.
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*/
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setDocument(pdfDocument, url = null) {
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if (this.pdfDocument) {
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this._reset();
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this._updateUI(true);
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}
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if (!pdfDocument) {
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return;
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}
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this.pdfDocument = pdfDocument;
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this.url = url;
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this._dataAvailableCapability.resolve();
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}
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/**
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* @private
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*/
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_reset() {
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this.pdfDocument = null;
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this.url = null;
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delete this.fieldData;
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this._dataAvailableCapability = createPromiseCapability();
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this._currentPageNumber = 1;
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this._pagesRotation = 0;
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}
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/**
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* Always updates all of the dialog fields, to prevent inconsistent UI state.
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* NOTE: If the contents of a particular field is neither a non-empty string,
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* nor a number, it will fall back to `DEFAULT_FIELD_CONTENT`.
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* @private
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*/
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_updateUI(reset = false) {
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if (reset || !this.fieldData) {
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for (const id in this.fields) {
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this.fields[id].textContent = DEFAULT_FIELD_CONTENT;
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}
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return;
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}
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if (this.overlayManager.active !== this.overlayName) {
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// Don't bother updating the dialog if has already been closed,
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// since it will be updated the next time `this.open` is called.
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return;
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}
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for (const id in this.fields) {
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const content = this.fieldData[id];
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this.fields[id].textContent =
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content || content === 0 ? content : DEFAULT_FIELD_CONTENT;
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}
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}
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/**
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* @private
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*/
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async _parseFileSize(fileSize = 0) {
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const kb = fileSize / 1024;
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if (!kb) {
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return undefined;
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} else if (kb < 1024) {
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return this.l10n.get(
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"document_properties_kb",
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{
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size_kb: (+kb.toPrecision(3)).toLocaleString(),
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size_b: fileSize.toLocaleString(),
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},
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"{{size_kb}} KB ({{size_b}} bytes)"
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);
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}
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return this.l10n.get(
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"document_properties_mb",
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{
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size_mb: (+(kb / 1024).toPrecision(3)).toLocaleString(),
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size_b: fileSize.toLocaleString(),
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},
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"{{size_mb}} MB ({{size_b}} bytes)"
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);
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}
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/**
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* @private
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*/
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async _parsePageSize(pageSizeInches, pagesRotation) {
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if (!pageSizeInches) {
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return undefined;
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}
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// Take the viewer rotation into account as well; compare with Adobe Reader.
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if (pagesRotation % 180 !== 0) {
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pageSizeInches = {
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width: pageSizeInches.height,
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height: pageSizeInches.width,
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};
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}
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const isPortrait = isPortraitOrientation(pageSizeInches);
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let sizeInches = {
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width: Math.round(pageSizeInches.width * 100) / 100,
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height: Math.round(pageSizeInches.height * 100) / 100,
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};
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// 1in == 25.4mm; no need to round to 2 decimals for millimeters.
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let sizeMillimeters = {
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width: Math.round(pageSizeInches.width * 25.4 * 10) / 10,
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height: Math.round(pageSizeInches.height * 25.4 * 10) / 10,
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};
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let pageName = null;
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let rawName =
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getPageName(sizeInches, isPortrait, US_PAGE_NAMES) ||
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getPageName(sizeMillimeters, isPortrait, METRIC_PAGE_NAMES);
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if (
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!rawName &&
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!(
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Number.isInteger(sizeMillimeters.width) &&
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Number.isInteger(sizeMillimeters.height)
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)
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) {
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// Attempt to improve the page name detection by falling back to fuzzy
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// matching of the metric dimensions, to account for e.g. rounding errors
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// and/or PDF files that define the page sizes in an imprecise manner.
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const exactMillimeters = {
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width: pageSizeInches.width * 25.4,
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height: pageSizeInches.height * 25.4,
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};
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const intMillimeters = {
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width: Math.round(sizeMillimeters.width),
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height: Math.round(sizeMillimeters.height),
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};
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// Try to avoid false positives, by only considering "small" differences.
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if (
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Math.abs(exactMillimeters.width - intMillimeters.width) < 0.1 &&
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Math.abs(exactMillimeters.height - intMillimeters.height) < 0.1
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) {
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rawName = getPageName(intMillimeters, isPortrait, METRIC_PAGE_NAMES);
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if (rawName) {
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// Update *both* sizes, computed above, to ensure that the displayed
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// dimensions always correspond to the detected page name.
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sizeInches = {
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width: Math.round((intMillimeters.width / 25.4) * 100) / 100,
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height: Math.round((intMillimeters.height / 25.4) * 100) / 100,
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};
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sizeMillimeters = intMillimeters;
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}
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}
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}
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if (rawName) {
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pageName = this.l10n.get(
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"document_properties_page_size_name_" + rawName.toLowerCase(),
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null,
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rawName
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);
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}
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return Promise.all([
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this._isNonMetricLocale ? sizeInches : sizeMillimeters,
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this.l10n.get(
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"document_properties_page_size_unit_" +
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(this._isNonMetricLocale ? "inches" : "millimeters"),
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null,
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this._isNonMetricLocale ? "in" : "mm"
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),
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pageName,
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this.l10n.get(
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"document_properties_page_size_orientation_" +
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(isPortrait ? "portrait" : "landscape"),
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null,
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isPortrait ? "portrait" : "landscape"
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),
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]).then(([{ width, height }, unit, name, orientation]) => {
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return this.l10n.get(
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"document_properties_page_size_dimension_" +
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(name ? "name_" : "") +
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"string",
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{
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width: width.toLocaleString(),
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height: height.toLocaleString(),
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unit,
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name,
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orientation,
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},
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"{{width}} × {{height}} {{unit}} (" +
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(name ? "{{name}}, " : "") +
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"{{orientation}})"
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);
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});
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}
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/**
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* @private
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*/
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async _parseDate(inputDate) {
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const dateObject = PDFDateString.toDateObject(inputDate);
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if (!dateObject) {
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return undefined;
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}
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return this.l10n.get(
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"document_properties_date_string",
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{
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date: dateObject.toLocaleDateString(),
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time: dateObject.toLocaleTimeString(),
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},
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"{{date}}, {{time}}"
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);
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}
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/**
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* @private
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*/
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_parseLinearization(isLinearized) {
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return this.l10n.get(
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"document_properties_linearized_" + (isLinearized ? "yes" : "no"),
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null,
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isLinearized ? "Yes" : "No"
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);
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}
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}
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export { PDFDocumentProperties };
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