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Move the permissions handling into the BaseViewer (PR 11789 follow-up)

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Besides making the permissions-functionality directly available in the viewer-components, these changes are also necessary for the next patch.
This commit is contained in:
Jonas Jenwald 2021-12-11 16:23:29 +01:00
parent d856ed9395
commit b03281de18
4 changed files with 35 additions and 46 deletions
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36
web/base_viewer.js
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@ -16,6 +16,7 @@
import {
AnnotationMode,
createPromiseCapability,
PermissionFlag,
PixelsPerInch,
version,
} from "pdfjs-lib";
@ -53,6 +54,7 @@ import { TextLayerBuilder } from "./text_layer_builder.js";
import { XfaLayerBuilder } from "./xfa_layer_builder.js";
const DEFAULT_CACHE_SIZE = 10;
const ENABLE_PERMISSIONS_CLASS = "enablePermissions";
const PagesCountLimit = {
FORCE_SCROLL_MODE_PAGE: 15000,
@ -95,6 +97,8 @@ const PagesCountLimit = {
* total pixels, i.e. width * height. Use -1 for no limit. The default value
* is 4096 * 4096 (16 mega-pixels).
* @property {IL10n} l10n - Localization service.
* @property {boolean} [enablePermissions] - Enables PDF document permissions,
* when they exist. The default value is `false`.
*/
class PDFPageViewBuffer {
@ -171,6 +175,8 @@ class PDFPageViewBuffer {
class BaseViewer {
#buffer = null;
#enablePermissions = false;
#previousContainerHeight = 0;
#scrollModePageState = null;
@ -227,6 +233,7 @@ class BaseViewer {
this.useOnlyCssZoom = options.useOnlyCssZoom || false;
this.maxCanvasPixels = options.maxCanvasPixels;
this.l10n = options.l10n || NullL10n;
this.#enablePermissions = options.enablePermissions || false;
this.defaultRenderingQueue = !options.renderingQueue;
if (this.defaultRenderingQueue) {
@ -472,10 +479,20 @@ class BaseViewer {
return this.pdfDocument ? this._pagesCapability.promise : null;
}
/**
* @private
*/
_onePageRenderedOrForceFetch() {
#initializePermissions(permissions, pdfDocument) {
if (pdfDocument !== this.pdfDocument) {
return; // The document was closed while the permissions resolved.
}
if (!permissions || !this.#enablePermissions) {
return;
}
// Currently only the "copy"-permission is supported.
if (!permissions.includes(PermissionFlag.COPY)) {
this.viewer.classList.add(ENABLE_PERMISSIONS_CLASS);
}
}
#onePageRenderedOrForceFetch() {
// Unless the viewer *and* its pages are visible, rendering won't start and
// `this._onePageRenderedCapability` thus won't be resolved.
// To ensure that automatic printing, on document load, still works even in
@ -520,6 +537,7 @@ class BaseViewer {
const firstPagePromise = pdfDocument.getPage(1);
// Rendering (potentially) depends on this, hence fetching it immediately.
const optionalContentConfigPromise = pdfDocument.getOptionalContentConfig();
const permissionsPromise = pdfDocument.getPermissions();
// Given that browsers don't handle huge amounts of DOM-elements very well,
// enforce usage of PAGE-scrolling when loading *very* long/large documents.
@ -564,10 +582,11 @@ class BaseViewer {
// Fetch a single page so we can get a viewport that will be the default
// viewport for all pages
firstPagePromise
.then(firstPdfPage => {
Promise.all([firstPagePromise, permissionsPromise])
.then(([firstPdfPage, permissions]) => {
this._firstPageCapability.resolve(firstPdfPage);
this._optionalContentConfigPromise = optionalContentConfigPromise;
this.#initializePermissions(permissions, pdfDocument);
const viewerElement =
this._scrollMode === ScrollMode.PAGE ? null : this.viewer;
@ -626,7 +645,7 @@ class BaseViewer {
// Fetch all the pages since the viewport is needed before printing
// starts to create the correct size canvas. Wait until one page is
// rendered so we don't tie up too many resources early on.
this._onePageRenderedOrForceFetch().then(async () => {
this.#onePageRenderedOrForceFetch().then(async () => {
if (this.findController) {
this.findController.setDocument(pdfDocument); // Enable searching.
}
@ -750,6 +769,9 @@ class BaseViewer {
this.viewer.textContent = "";
// ... and reset the Scroll mode CSS class(es) afterwards.
this._updateScrollMode();
// Reset all PDF document permissions.
this.viewer.classList.remove(ENABLE_PERMISSIONS_CLASS);
}
#ensurePageViewVisible() {