pdfjs-dist/lib/web/pdf_document_properties.js

/**
 * @licstart The following is the entire license notice for the
 * JavaScript code in this page
 *
 * Copyright 2022 Mozilla Foundation
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 *
 * @licend The above is the entire license notice for the
 * JavaScript code in this page
 */
"use strict";

Object.defineProperty(exports, "__esModule", {
  value: true
});
exports.PDFDocumentProperties = void 0;

var _pdf = require("../pdf");

var _ui_utils = require("./ui_utils.js");

const DEFAULT_FIELD_CONTENT = "-";
const NON_METRIC_LOCALES = ["en-us", "en-lr", "my"];
const US_PAGE_NAMES = {
  "8.5x11": "Letter",
  "8.5x14": "Legal"
};
const METRIC_PAGE_NAMES = {
  "297x420": "A3",
  "210x297": "A4"
};

function getPageName(size, isPortrait, pageNames) {
  const width = isPortrait ? size.width : size.height;
  const height = isPortrait ? size.height : size.width;
  return pageNames[`${width}x${height}`];
}

class PDFDocumentProperties {
  #fieldData = null;

  constructor({
    dialog,
    fields,
    closeButton
  }, overlayManager, eventBus, l10n, fileNameLookup) {
    this.dialog = dialog;
    this.fields = fields;
    this.overlayManager = overlayManager;
    this.l10n = l10n;
    this._fileNameLookup = fileNameLookup;
    this.#reset();
    closeButton.addEventListener("click", this.close.bind(this));
    this.overlayManager.register(this.dialog);

    eventBus._on("pagechanging", evt => {
      this._currentPageNumber = evt.pageNumber;
    });

    eventBus._on("rotationchanging", evt => {
      this._pagesRotation = evt.pagesRotation;
    });

    this._isNonMetricLocale = true;
    l10n.getLanguage().then(locale => {
      this._isNonMetricLocale = NON_METRIC_LOCALES.includes(locale);
    });
  }

  async open() {
    await Promise.all([this.overlayManager.open(this.dialog), this._dataAvailableCapability.promise]);
    const currentPageNumber = this._currentPageNumber;
    const pagesRotation = this._pagesRotation;

    if (this.#fieldData && currentPageNumber === this.#fieldData._currentPageNumber && pagesRotation === this.#fieldData._pagesRotation) {
      this.#updateUI();
      return;
    }

    const {
      info,
      contentLength
    } = await this.pdfDocument.getMetadata();
    const [fileName, fileSize, creationDate, modificationDate, pageSize, isLinearized] = await Promise.all([this._fileNameLookup(), this.#parseFileSize(contentLength), this.#parseDate(info.CreationDate), this.#parseDate(info.ModDate), this.pdfDocument.getPage(currentPageNumber).then(pdfPage => {
      return this.#parsePageSize((0, _ui_utils.getPageSizeInches)(pdfPage), pagesRotation);
    }), this.#parseLinearization(info.IsLinearized)]);
    this.#fieldData = Object.freeze({
      fileName,
      fileSize,
      title: info.Title,
      author: info.Author,
      subject: info.Subject,
      keywords: info.Keywords,
      creationDate,
      modificationDate,
      creator: info.Creator,
      producer: info.Producer,
      version: info.PDFFormatVersion,
      pageCount: this.pdfDocument.numPages,
      pageSize,
      linearized: isLinearized,
      _currentPageNumber: currentPageNumber,
      _pagesRotation: pagesRotation
    });
    this.#updateUI();
    const {
      length
    } = await this.pdfDocument.getDownloadInfo();

    if (contentLength === length) {
      return;
    }

    const data = Object.assign(Object.create(null), this.#fieldData);
    data.fileSize = await this.#parseFileSize(length);
    this.#fieldData = Object.freeze(data);
    this.#updateUI();
  }

  async close() {
    this.overlayManager.close(this.dialog);
  }

  setDocument(pdfDocument) {
    if (this.pdfDocument) {
      this.#reset();
      this.#updateUI(true);
    }

    if (!pdfDocument) {
      return;
    }

    this.pdfDocument = pdfDocument;

    this._dataAvailableCapability.resolve();
  }

  #reset() {
    this.pdfDocument = null;
    this.#fieldData = null;
    this._dataAvailableCapability = (0, _pdf.createPromiseCapability)();
    this._currentPageNumber = 1;
    this._pagesRotation = 0;
  }

  #updateUI(reset = false) {
    if (reset || !this.#fieldData) {
      for (const id in this.fields) {
        this.fields[id].textContent = DEFAULT_FIELD_CONTENT;
      }

      return;
    }

    if (this.overlayManager.active !== this.dialog) {
      return;
    }

    for (const id in this.fields) {
      const content = this.#fieldData[id];
      this.fields[id].textContent = content || content === 0 ? content : DEFAULT_FIELD_CONTENT;
    }
  }

  async #parseFileSize(fileSize = 0) {
    const kb = fileSize / 1024,
          mb = kb / 1024;

    if (!kb) {
      return undefined;
    }

    return this.l10n.get(`document_properties_${mb >= 1 ? "mb" : "kb"}`, {
      size_mb: mb >= 1 && (+mb.toPrecision(3)).toLocaleString(),
      size_kb: mb < 1 && (+kb.toPrecision(3)).toLocaleString(),
      size_b: fileSize.toLocaleString()
    });
  }

  async #parsePageSize(pageSizeInches, pagesRotation) {
    if (!pageSizeInches) {
      return undefined;
    }

    if (pagesRotation % 180 !== 0) {
      pageSizeInches = {
        width: pageSizeInches.height,
        height: pageSizeInches.width
      };
    }

    const isPortrait = (0, _ui_utils.isPortraitOrientation)(pageSizeInches);
    let sizeInches = {
      width: Math.round(pageSizeInches.width * 100) / 100,
      height: Math.round(pageSizeInches.height * 100) / 100
    };
    let sizeMillimeters = {
      width: Math.round(pageSizeInches.width * 25.4 * 10) / 10,
      height: Math.round(pageSizeInches.height * 25.4 * 10) / 10
    };
    let rawName = getPageName(sizeInches, isPortrait, US_PAGE_NAMES) || getPageName(sizeMillimeters, isPortrait, METRIC_PAGE_NAMES);

    if (!rawName && !(Number.isInteger(sizeMillimeters.width) && Number.isInteger(sizeMillimeters.height))) {
      const exactMillimeters = {
        width: pageSizeInches.width * 25.4,
        height: pageSizeInches.height * 25.4
      };
      const intMillimeters = {
        width: Math.round(sizeMillimeters.width),
        height: Math.round(sizeMillimeters.height)
      };

      if (Math.abs(exactMillimeters.width - intMillimeters.width) < 0.1 && Math.abs(exactMillimeters.height - intMillimeters.height) < 0.1) {
        rawName = getPageName(intMillimeters, isPortrait, METRIC_PAGE_NAMES);

        if (rawName) {
          sizeInches = {
            width: Math.round(intMillimeters.width / 25.4 * 100) / 100,
            height: Math.round(intMillimeters.height / 25.4 * 100) / 100
          };
          sizeMillimeters = intMillimeters;
        }
      }
    }

    const [{
      width,
      height
    }, unit, name, orientation] = await Promise.all([this._isNonMetricLocale ? sizeInches : sizeMillimeters, this.l10n.get(`document_properties_page_size_unit_${this._isNonMetricLocale ? "inches" : "millimeters"}`), rawName && this.l10n.get(`document_properties_page_size_name_${rawName.toLowerCase()}`), this.l10n.get(`document_properties_page_size_orientation_${isPortrait ? "portrait" : "landscape"}`)]);
    return this.l10n.get(`document_properties_page_size_dimension_${name ? "name_" : ""}string`, {
      width: width.toLocaleString(),
      height: height.toLocaleString(),
      unit,
      name,
      orientation
    });
  }

  async #parseDate(inputDate) {
    const dateObject = _pdf.PDFDateString.toDateObject(inputDate);

    if (!dateObject) {
      return undefined;
    }

    return this.l10n.get("document_properties_date_string", {
      date: dateObject.toLocaleDateString(),
      time: dateObject.toLocaleTimeString()
    });
  }

  #parseLinearization(isLinearized) {
    return this.l10n.get(`document_properties_linearized_${isLinearized ? "yes" : "no"}`);
  }

}

exports.PDFDocumentProperties = PDFDocumentProperties;