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Support disabling of form editing when pdfjs.enablePermissions is set (issue 14356)

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For encrypted PDF documents without the required permissions set, this patch adds support for disabling of form editing. However, please note that it also requires that the `pdfjs.enablePermissions` preference is set to `true`[1] (since PDF document permissions could be seen as user hostile).

Based on https://www.adobe.com/content/dam/acom/en/devnet/pdf/pdfs/PDF32000_2008.pdf#G6.1942134, this condition hopefully makes sense.

---
[1] Either manually with `about:config`, or using e.g. a [Group Policy](https://github.com/mozilla/policy-templates).
This commit is contained in:
Jonas Jenwald 2021-12-11 16:53:59 +01:00
parent b03281de18
commit b1d3e7f121
2 changed files with 34 additions and 10 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

32
web/base_viewer.js
View File

@ -175,6 +175,10 @@ class PDFPageViewBuffer {
class BaseViewer {
#buffer = null;
#annotationMode = AnnotationMode.ENABLE_FORMS;
#previousAnnotationMode = null;
#enablePermissions = false;
#previousContainerHeight = 0;
@ -225,7 +229,7 @@ class BaseViewer {
this._scriptingManager = options.scriptingManager || null;
this.removePageBorders = options.removePageBorders || false;
this.textLayerMode = options.textLayerMode ?? TextLayerMode.ENABLE;
this._annotationMode =
this.#annotationMode =
options.annotationMode ?? AnnotationMode.ENABLE_FORMS;
this.imageResourcesPath = options.imageResourcesPath || "";
this.enablePrintAutoRotate = options.enablePrintAutoRotate || false;
@ -286,7 +290,7 @@ class BaseViewer {
* @type {boolean}
*/
get renderForms() {
return this._annotationMode === AnnotationMode.ENABLE_FORMS;
return this.#annotationMode === AnnotationMode.ENABLE_FORMS;
}
/**
@ -479,6 +483,9 @@ class BaseViewer {
return this.pdfDocument ? this._pagesCapability.promise : null;
}
/**
* Currently only *some* permissions are supported.
*/
#initializePermissions(permissions, pdfDocument) {
if (pdfDocument !== this.pdfDocument) {
return; // The document was closed while the permissions resolved.
@ -486,10 +493,20 @@ class BaseViewer {
if (!permissions || !this.#enablePermissions) {
return;
}
// Currently only the "copy"-permission is supported.
if (!permissions.includes(PermissionFlag.COPY)) {
this.viewer.classList.add(ENABLE_PERMISSIONS_CLASS);
}
if (
!permissions.includes(PermissionFlag.MODIFY_ANNOTATIONS) &&
!permissions.includes(PermissionFlag.FILL_INTERACTIVE_FORMS)
) {
if (this.#annotationMode === AnnotationMode.ENABLE_FORMS) {
this.#previousAnnotationMode = this.#annotationMode; // Allow resetting.
this.#annotationMode = AnnotationMode.ENABLE;
}
}
}
#onePageRenderedOrForceFetch() {
@ -599,7 +616,7 @@ class BaseViewer {
? this
: null;
const annotationLayerFactory =
this._annotationMode !== AnnotationMode.DISABLE ? this : null;
this.#annotationMode !== AnnotationMode.DISABLE ? this : null;
const xfaLayerFactory = isPureXfa ? this : null;
for (let pageNum = 1; pageNum <= pagesCount; ++pageNum) {
@ -614,7 +631,7 @@ class BaseViewer {
textLayerFactory,
textLayerMode: this.textLayerMode,
annotationLayerFactory,
annotationMode: this._annotationMode,
annotationMode: this.#annotationMode,
xfaLayerFactory,
textHighlighterFactory: this,
structTreeLayerFactory: this,
@ -772,6 +789,11 @@ class BaseViewer {
// Reset all PDF document permissions.
this.viewer.classList.remove(ENABLE_PERMISSIONS_CLASS);
if (this.#previousAnnotationMode !== null) {
this.#annotationMode = this.#previousAnnotationMode;
this.#previousAnnotationMode = null;
}
}
#ensurePageViewVisible() {

12
web/pdf_page_view.js
View File

@ -76,6 +76,8 @@ const MAX_CANVAS_PIXELS = compatibilityParams.maxCanvasPixels || 16777216;
* @implements {IRenderableView}
*/
class PDFPageView {
#annotationMode = AnnotationMode.ENABLE_FORMS;
/**
* @param {PDFPageViewOptions} options
*/
@ -96,7 +98,7 @@ class PDFPageView {
options.optionalContentConfigPromise || null;
this.hasRestrictedScaling = false;
this.textLayerMode = options.textLayerMode ?? TextLayerMode.ENABLE;
this._annotationMode =
this.#annotationMode =
options.annotationMode ?? AnnotationMode.ENABLE_FORMS;
this.imageResourcesPath = options.imageResourcesPath || "";
this.useOnlyCssZoom = options.useOnlyCssZoom || false;
@ -597,7 +599,7 @@ class PDFPageView {
this.textLayer = textLayer;
if (
this._annotationMode !== AnnotationMode.DISABLE &&
this.#annotationMode !== AnnotationMode.DISABLE &&
this.annotationLayerFactory
) {
this._annotationCanvasMap ||= new Map();
@ -607,7 +609,7 @@ class PDFPageView {
pdfPage,
/* annotationStorage = */ null,
this.imageResourcesPath,
this._annotationMode === AnnotationMode.ENABLE_FORMS,
this.#annotationMode === AnnotationMode.ENABLE_FORMS,
this.l10n,
/* enableScripting = */ null,
/* hasJSActionsPromise = */ null,
@ -835,7 +837,7 @@ class PDFPageView {
canvasContext: ctx,
transform,
viewport: this.viewport,
annotationMode: this._annotationMode,
annotationMode: this.#annotationMode,
optionalContentConfigPromise: this._optionalContentConfigPromise,
annotationCanvasMap: this._annotationCanvasMap,
};
@ -892,7 +894,7 @@ class PDFPageView {
});
const promise = pdfPage
.getOperatorList({
annotationMode: this._annotationMode,
annotationMode: this.#annotationMode,
})
.then(opList => {
ensureNotCancelled();