/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at
http://mozilla.org/MPL/2.0/. */
import { Domain } from "chrome://remote/content/cdp/domains/Domain.sys.mjs";
const lazy = {};
ChromeUtils.defineESModuleGetters(lazy, {
SessionStore: "resource:///modules/sessionstore/SessionStore.sys.mjs",
DialogHandler:
"chrome://remote/content/cdp/domains/parent/page/DialogHandler.sys.mjs",
generateUUID: "chrome://remote/content/shared/UUID.sys.mjs",
PollPromise: "chrome://remote/content/shared/Sync.sys.mjs",
print: "chrome://remote/content/shared/PDF.sys.mjs",
streamRegistry: "chrome://remote/content/cdp/domains/parent/IO.sys.mjs",
Stream: "chrome://remote/content/cdp/StreamRegistry.sys.mjs",
TabManager: "chrome://remote/content/shared/TabManager.sys.mjs",
UnsupportedError: "chrome://remote/content/cdp/Error.sys.mjs",
windowManager: "chrome://remote/content/shared/WindowManager.sys.mjs",
});
const MAX_CANVAS_DIMENSION = 32767;
const MAX_CANVAS_AREA = 472907776;
const PRINT_MAX_SCALE_VALUE = 2.0;
const PRINT_MIN_SCALE_VALUE = 0.1;
const PDF_TRANSFER_MODES = {
base64: "ReturnAsBase64",
stream: "ReturnAsStream",
};
const TIMEOUT_SET_HISTORY_INDEX = 1000;
export class Page extends Domain {
constructor(session) {
super(session);
this._onDialogLoaded = this._onDialogLoaded.bind(this);
this._onRequest = this._onRequest.bind(this);
this.enabled = false;
this.session.networkObserver.startTrackingBrowserNetwork(
this.session.target.browser
);
this.session.networkObserver.on("request", this._onRequest);
}
destructor() {
// Flip a flag to avoid to disable the content domain from this.disable()
this._isDestroyed = false;
this.disable();
this.session.networkObserver.off("request", this._onRequest);
this.session.networkObserver.stopTrackingBrowserNetwork(
this.session.target.browser
);
super.destructor();
}
// commands
/**
* Navigates current page to given URL.
*
* @param {object} options
* @param {string} options.url
* destination URL
* @param {string=} options.frameId
* frame id to navigate (not supported),
* if not specified navigate top frame
* @param {string=} options.referrer
* referred URL (optional)
* @param {string=} options.transitionType
* intended transition type
* @returns {object}
* - frameId {string} frame id that has navigated (or failed to)
* - errorText {string=} error message if navigation has failed
* - loaderId {string} (not supported)
*/
async navigate(options = {}) {
const { url, frameId, referrer, transitionType } = options;
if (typeof url != "string") {
throw new TypeError("url: string value expected");
}
let validURL;
try {
validURL = Services.io.newURI(url);
} catch (e) {
throw new Error("Error: Cannot navigate to invalid URL");
}
const topFrameId = this.session.browsingContext.id.toString();
if (frameId && frameId != topFrameId) {
throw new lazy.UnsupportedError("frameId not supported");
}
const hitsNetwork = ["https", "http"].includes(validURL.scheme);
let networkLessLoaderId;
if (!hitsNetwork) {
// This navigation will not hit the network, use a randomly generated id.
networkLessLoaderId = lazy.generateUUID();
// Update the content process map of loader ids.
await this.executeInChild("_updateLoaderId", {
frameId: this.session.browsingContext.id,
loaderId: networkLessLoaderId,
});
}
const currentURI = this.session.browsingContext.currentURI;
const isSameDocumentNavigation =
// The "host", "query" and "ref" getters can throw if the URLs are not
// http/https, so verify first that both currentURI and validURL are
// using http/https.
hitsNetwork &&
["https", "http"].includes(currentURI.scheme) &&
currentURI.host === validURL.host &&
currentURI.query === validURL.query &&
!!validURL.ref;
const requestDone = new Promise(resolve => {
if (isSameDocumentNavigation) {
// Per CDP documentation, same-document navigations should not emit any
// loader id (
https://chromedevtools.github.io/devtools-protocol/tot/Page/#method-navigate)
resolve({});
return;
}
if (!hitsNetwork) {
// This navigation will not hit the network, use a randomly generated id.
resolve({ navigationRequestId: networkLessLoaderId });
return;
}
let navigationRequestId, redirectedRequestId;
const _onNavigationRequest = function (_type, _ch, data) {
const {
url: requestURL,
requestId,
redirectedFrom = null,
isNavigationRequest,
} = data;
if (!isNavigationRequest) {
return;
}
if (validURL.spec === requestURL) {
navigationRequestId = redirectedRequestId = requestId;
} else if (redirectedFrom === redirectedRequestId) {
redirectedRequestId = requestId;
}
};
const _onRequestFinished = function (_type, _ch, data) {
const { requestId, errorCode } = data;
if (
redirectedRequestId !== requestId ||
errorCode == "NS_BINDING_REDIRECTED"
) {
// handle next request in redirection chain
return;
}
this.session.networkObserver.off("request", _onNavigationRequest);
this.session.networkObserver.off("requestfinished", _onRequestFinished);
resolve({ errorCode, navigationRequestId });
}.bind(this);
this.session.networkObserver.on("request", _onNavigationRequest);
this.session.networkObserver.on("requestfinished", _onRequestFinished);
});
const opts = {
loadFlags: transitionToLoadFlag(transitionType),
referrerURI: referrer,
triggeringPrincipal: Services.scriptSecurityManager.getSystemPrincipal(),
};
this.session.browsingContext.loadURI(validURL, opts);
// clients expect loaderId == requestId for a document navigation request
const { navigationRequestId: loaderId, errorCode } = await requestDone;
const result = {
frameId: topFrameId,
loaderId,
};
if (errorCode) {
result.errorText = errorCode;
}
return result;
}
/**
* Capture page screenshot.
*
* @param {object} options
* @param {Viewport=} options.clip
* Capture the screenshot of a given region only.
* @param {string=} options.format
* Image compression format. Defaults to "png".
* @param {number=} options.quality
* Compression quality from range [0..100] (jpeg only). Defaults to 80.
*
* @returns {string}
* Base64-encoded image data.
*/
async captureScreenshot(options = {}) {
const { clip, format = "png", quality = 80 } = options;
if (options.fromSurface) {
throw new lazy.UnsupportedError("fromSurface not supported");
}
let rect;
let scale = await this.executeInChild("_devicePixelRatio");
if (clip) {
for (const prop of ["x", "y", "width", "height", "scale"]) {
if (clip[prop] == undefined) {
throw new TypeError(`clip.${prop}: double value expected`);
}
}
const contentRect = await this.executeInChild("_contentRect");
// For invalid scale values default to full page
if (clip.scale <= 0) {
Object.assign(clip, {
x: 0,
y: 0,
width: contentRect.width,
height: contentRect.height,
scale: 1,
});
} else {
if (clip.x < 0 || clip.x > contentRect.width - 1) {
clip.x = 0;
}
if (clip.y < 0 || clip.y > contentRect.height - 1) {
clip.y = 0;
}
if (clip.width <= 0) {
clip.width = contentRect.width;
}
if (clip.height <= 0) {
clip.height = contentRect.height;
}
}
rect = new DOMRect(clip.x, clip.y, clip.width, clip.height);
scale *= clip.scale;
} else {
// If no specific clipping region has been specified,
// fallback to the layout (fixed) viewport, and the
// default pixel ratio.
const { pageX, pageY, clientWidth, clientHeight } =
await this.executeInChild("_layoutViewport");
rect = new DOMRect(pageX, pageY, clientWidth, clientHeight);
}
let canvasWidth = rect.width * scale;
let canvasHeight = rect.height * scale;
// Cap the screenshot size based on maximum allowed canvas sizes.
// Using higher dimensions would trigger exceptions in Gecko.
//
// See:
https://developer.mozilla.org/en-US/docs/Web/HTML/Element/canvas#Maximum_canvas_size
if (canvasWidth > MAX_CANVAS_DIMENSION) {
rect.width = Math.floor(MAX_CANVAS_DIMENSION / scale);
canvasWidth = rect.width * scale;
}
if (canvasHeight > MAX_CANVAS_DIMENSION) {
rect.height = Math.floor(MAX_CANVAS_DIMENSION / scale);
canvasHeight = rect.height * scale;
}
// If the area is larger, reduce the height to keep the full width.
if (canvasWidth * canvasHeight > MAX_CANVAS_AREA) {
rect.height = Math.floor(MAX_CANVAS_AREA / (canvasWidth * scale));
canvasHeight = rect.height * scale;
}
const { browsingContext, window } = this.session.target;
const snapshot = await browsingContext.currentWindowGlobal.drawSnapshot(
rect,
scale,
"rgb(255,255,255)"
);
const canvas = window.document.createElementNS(
"
http://www.w3.org/1999/xhtml",
"canvas"
);
canvas.width = canvasWidth;
canvas.height = canvasHeight;
const ctx = canvas.getContext("2d");
ctx.drawImage(snapshot, 0, 0);
// Bug 1574935 - Huge dimensions can trigger an OOM because multiple copies
// of the bitmap will exist in memory. Force the removal of the snapshot
// because it is no longer needed.
snapshot.close();
const url = canvas.toDataURL(`image/${format}`, quality / 100);
if (!url.startsWith(`data:image/${format}`)) {
throw new lazy.UnsupportedError(`Unsupported MIME type: image/${format}`);
}
// only return the base64 encoded data without the data URL prefix
const data = url.substring(url.indexOf(",") + 1);
return { data };
}
async enable() {
if (this.enabled) {
return;
}
this.enabled = true;
const { browser } = this.session.target;
this._dialogHandler = new lazy.DialogHandler(browser);
this._dialogHandler.on("dialog-loaded", this._onDialogLoaded);
await this.executeInChild("enable");
}
async disable() {
if (!this.enabled) {
return;
}
this._dialogHandler.destructor();
this._dialogHandler = null;
this.enabled = false;
if (!this._isDestroyed) {
// Only call disable in the content domain if we are not destroying the domain.
// If we are destroying the domain, the content domains will be destroyed
// independently after firing the remote:destroy event.
await this.executeInChild("disable");
}
}
async bringToFront() {
const { tab, window } = this.session.target;
// Focus the window, and select the corresponding tab
await lazy.windowManager.focusWindow(window);
await lazy.TabManager.selectTab(tab);
}
/**
* Return metrics relating to the layouting of the page.
*
* The returned object contains the following entries:
*
* layoutViewport:
* {number} pageX
* Horizontal offset relative to the document (CSS pixels)
* {number} pageY
* Vertical offset relative to the document (CSS pixels)
* {number} clientWidth
* Width (CSS pixels), excludes scrollbar if present
* {number} clientHeight
* Height (CSS pixels), excludes scrollbar if present
*
* visualViewport:
* {number} offsetX
* Horizontal offset relative to the layout viewport (CSS pixels)
* {number} offsetY
* Vertical offset relative to the layout viewport (CSS pixels)
* {number} pageX
* Horizontal offset relative to the document (CSS pixels)
* {number} pageY
* Vertical offset relative to the document (CSS pixels)
* {number} clientWidth
* Width (CSS pixels), excludes scrollbar if present
* {number} clientHeight
* Height (CSS pixels), excludes scrollbar if present
* {number} scale
* Scale relative to the ideal viewport (size at width=device-width)
* {number} zoom
* Page zoom factor (CSS to device independent pixels ratio)
*
* contentSize:
* {number} x
* X coordinate
* {number} y
* Y coordinate
* {number} width
* Width of scrollable area
* {number} height
* Height of scrollable area
*
* @returns {Promise<object>}
* Promise which resolves with an object with the following properties
* layoutViewport and contentSize
*/
async getLayoutMetrics() {
return {
layoutViewport: await this.executeInChild("_layoutViewport"),
contentSize: await this.executeInChild("_contentRect"),
};
}
/**
* Returns navigation history for the current page.
*
* @returns {Promise<object>}
* Promise which resolves with an object with the following properties
* currentIndex (number) and entries (Array<NavigationEntry>).
*/
async getNavigationHistory() {
const { window } = this.session.target;
return new Promise(resolve => {
function updateSessionHistory(sessionHistory) {
const entries = sessionHistory.entries.map(entry => {
return {
id: entry.ID,
url: entry.url,
userTypedURL: entry.originalURI || entry.url,
title: entry.title,
// TODO: Bug 1609514
transitionType: null,
};
});
resolve({
currentIndex: sessionHistory.index,
entries,
});
}
lazy.SessionStore.getSessionHistory(
window.gBrowser.selectedTab,
updateSessionHistory
);
});
}
/**
* Interact with the currently opened JavaScript dialog (alert, confirm,
* prompt) for this page. This will always close the dialog, either accepting
* or rejecting it, with the optional prompt filled.
*
* @param {object} options
* @param {boolean=} options.accept
* for "confirm", "prompt", "beforeunload" dialogs true will accept
* the dialog, false will cancel it. For "alert" dialogs, true or
* false closes the dialog in the same way.
* @param {string=} options.promptText
* for "prompt" dialogs, used to fill the prompt input.
*/
async handleJavaScriptDialog(options = {}) {
const { accept, promptText } = options;
if (!this.enabled) {
throw new Error("Page domain is not enabled");
}
await this._dialogHandler.handleJavaScriptDialog({ accept, promptText });
}
/**
* Navigates current page to the given history entry.
*
* @param {object} options
* @param {number} options.entryId
* Unique id of the entry to navigate to.
*/
async navigateToHistoryEntry(options = {}) {
const { entryId } = options;
const index = await this._getIndexForHistoryEntryId(entryId);
if (index == null) {
throw new Error("No entry with passed id");
}
const { window } = this.session.target;
window.gBrowser.gotoIndex(index);
// On some platforms the requested index isn't set immediately.
await lazy.PollPromise(
async (resolve, reject) => {
const currentIndex = await this._getCurrentHistoryIndex();
if (currentIndex == index) {
resolve();
} else {
reject();
}
},
{ timeout: TIMEOUT_SET_HISTORY_INDEX }
);
}
/**
* Print page as PDF.
*
* @param {object} options
* @param {boolean=} options.displayHeaderFooter
* Display header and footer. Defaults to false.
* @param {string=} options.footerTemplate (not supported)
* HTML template for the print footer.
* @param {string=} options.headerTemplate (not supported)
* HTML template for the print header. Should use the same format
* as the footerTemplate.
* @param {boolean=} options.ignoreInvalidPageRanges
* Whether to silently ignore invalid but successfully parsed page ranges,
* such as '3-2'. Defaults to false.
* @param {boolean=} options.landscape
* Paper orientation. Defaults to false.
* @param {number=} options.marginBottom
* Bottom margin in inches. Defaults to 1cm (~0.4 inches).
* @param {number=} options.marginLeft
* Left margin in inches. Defaults to 1cm (~0.4 inches).
* @param {number=} options.marginRight
* Right margin in inches. Defaults to 1cm (~0.4 inches).
* @param {number=} options.marginTop
* Top margin in inches. Defaults to 1cm (~0.4 inches).
* @param {string=} options.pageRanges (not supported)
* Paper ranges to print, e.g., '1-5, 8, 11-13'.
* Defaults to the empty string, which means print all pages.
* @param {number=} options.paperHeight
* Paper height in inches. Defaults to 11 inches.
* @param {number=} options.paperWidth
* Paper width in inches. Defaults to 8.5 inches.
* @param {boolean=} options.preferCSSPageSize
* Whether or not to prefer page size as defined by CSS.
* Defaults to false, in which case the content will be scaled
* to fit the paper size.
* @param {boolean=} options.printBackground
* Print background graphics. Defaults to false.
* @param {number=} options.scale
* Scale of the webpage rendering. Defaults to 1.
* @param {string=} options.transferMode
* Return as base64-encoded string (ReturnAsBase64),
* or stream (ReturnAsStream). Defaults to ReturnAsBase64.
*
* @returns {Promise<{data:string, stream:Stream}>}
* Based on the transferMode setting data is a base64-encoded string,
* or stream is a Stream.
*/
async printToPDF(options = {}) {
const {
displayHeaderFooter = false,
// Bug 1601570 - Implement templates for header and footer
// headerTemplate = "",
// footerTemplate = "",
landscape = false,
marginBottom = 0.39,
marginLeft = 0.39,
marginRight = 0.39,
marginTop = 0.39,
// Bug 1601571 - Implement handling of page ranges
// TODO: pageRanges = "",
// TODO: ignoreInvalidPageRanges = false,
paperHeight = 11.0,
paperWidth = 8.5,
preferCSSPageSize = false,
printBackground = false,
scale = 1.0,
transferMode = PDF_TRANSFER_MODES.base64,
} = options;
if (marginBottom < 0) {
throw new TypeError("marginBottom is negative");
}
if (marginLeft < 0) {
throw new TypeError("marginLeft is negative");
}
if (marginRight < 0) {
throw new TypeError("marginRight is negative");
}
if (marginTop < 0) {
throw new TypeError("marginTop is negative");
}
if (scale < PRINT_MIN_SCALE_VALUE || scale > PRINT_MAX_SCALE_VALUE) {
throw new TypeError("scale is outside [0.1 - 2] range");
}
if (paperHeight <= 0) {
throw new TypeError("paperHeight is zero or negative");
}
if (paperWidth <= 0) {
throw new TypeError("paperWidth is zero or negative");
}
const psService = Cc["@mozilla.org/gfx/printsettings-service;1"].getService(
Ci.nsIPrintSettingsService
);
const printSettings = psService.createNewPrintSettings();
printSettings.isInitializedFromPrinter = true;
printSettings.isInitializedFromPrefs = true;
printSettings.outputFormat = Ci.nsIPrintSettings.kOutputFormatPDF;
printSettings.printerName = "";
printSettings.printSilent = true;
printSettings.paperSizeUnit = Ci.nsIPrintSettings.kPaperSizeInches;
printSettings.paperWidth = paperWidth;
printSettings.paperHeight = paperHeight;
// Override any os-specific unwriteable margins
printSettings.unwriteableMarginTop = 0;
printSettings.unwriteableMarginLeft = 0;
printSettings.unwriteableMarginBottom = 0;
printSettings.unwriteableMarginRight = 0;
printSettings.marginBottom = marginBottom;
printSettings.marginLeft = marginLeft;
printSettings.marginRight = marginRight;
printSettings.marginTop = marginTop;
printSettings.printBGColors = printBackground;
printSettings.printBGImages = printBackground;
printSettings.scaling = scale;
printSettings.shrinkToFit = preferCSSPageSize;
if (!displayHeaderFooter) {
printSettings.headerStrCenter = "";
printSettings.headerStrLeft = "";
printSettings.headerStrRight = "";
printSettings.footerStrCenter = "";
printSettings.footerStrLeft = "";
printSettings.footerStrRight = "";
}
if (landscape) {
printSettings.orientation = Ci.nsIPrintSettings.kLandscapeOrientation;
}
const retval = { data: null, stream: null };
const { linkedBrowser } = this.session.target.tab;
if (transferMode === PDF_TRANSFER_MODES.stream) {
// If we are returning a stream, we write the PDF to disk so that we don't
// keep (potentially very large) PDFs in memory. We can then stream them
// to the client via the returned Stream.
//
// NOTE: This is a potentially premature optimization -- it might be fine
// to keep these PDFs in memory, but we don't have specifics on how CDP is
// used in the field so it is possible that leaving the PDFs in memory
// could cause a regression.
const path = await IOUtils.createUniqueFile(
PathUtils.tempDir,
"remote-agent.pdf"
);
printSettings.outputDestination =
Ci.nsIPrintSettings.kOutputDestinationFile;
printSettings.toFileName = path;
await linkedBrowser.browsingContext.print(printSettings);
retval.stream = lazy.streamRegistry.add(new lazy.Stream(path));
} else {
const binaryString = await lazy.print.printToBinaryString(
linkedBrowser.browsingContext,
printSettings
);
retval.data = btoa(binaryString);
}
return retval;
}
/**
* Intercept file chooser requests and transfer control to protocol clients.
*
* When file chooser interception is enabled,
* the native file chooser dialog is not shown.
* Instead, a protocol event Page.fileChooserOpened is emitted.
*/
setInterceptFileChooserDialog() {}
_getCurrentHistoryIndex() {
const { window } = this.session.target;
return new Promise(resolve => {
lazy.SessionStore.getSessionHistory(
window.gBrowser.selectedTab,
history => {
resolve(history.index);
}
);
});
}
_getIndexForHistoryEntryId(id) {
const { window } = this.session.target;
return new Promise(resolve => {
function updateSessionHistory(sessionHistory) {
sessionHistory.entries.forEach((entry, index) => {
if (entry.ID == id) {
resolve(index);
}
});
resolve(null);
}
lazy.SessionStore.getSessionHistory(
window.gBrowser.selectedTab,
updateSessionHistory
);
});
}
/**
* Emit the proper CDP event javascriptDialogOpening when a javascript dialog
* opens for the current target.
*/
_onDialogLoaded(e, data) {
const { message, type } = data;
// XXX: We rely on the common-dialog-loaded event (see DialogHandler.sys.mjs)
// which is inconsistent with the name "javascriptDialogOpening".
// For correctness we should rely on an event fired _before_ the prompt is
// visible, such as DOMWillOpenModalDialog. However the payload of this
// event does not contain enough data to populate javascriptDialogOpening.
//
// Since the event is fired asynchronously, this should not have an impact
// on the actual tests relying on this API.
this.emit("Page.javascriptDialogOpening", { message, type });
}
/**
* Handles HTTP request to propagate loaderId to events emitted from
* content process
*/
_onRequest(_type, _ch, data) {
if (!data.loaderId) {
return;
}
this.executeInChild("_updateLoaderId", {
loaderId: data.loaderId,
frameId: data.frameId,
});
}
}
function transitionToLoadFlag(transitionType) {
switch (transitionType) {
case "reload":
return Ci.nsIWebNavigation.LOAD_FLAGS_IS_REFRESH;
case "link":
default:
return Ci.nsIWebNavigation.LOAD_FLAGS_IS_LINK;
}
}
