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/* 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 { XPCOMUtils } from "resource://gre/modules/XPCOMUtils.sys.mjs";
import { Domain } from "chrome://remote/content/cdp/domains/Domain.sys.mjs";
const lazy = {};
XPCOMUtils.defineLazyModuleGetters(lazy, {
NetUtil: "resource://gre/modules/NetUtil.jsm",
});
const MAX_WINDOW_SIZE = 10000000;
export class Emulation extends Domain {
destructor() {
this.setUserAgentOverride({ userAgent: "", platform: "" });
super.destructor();
}
/**
* Overrides the values of device screen dimensions.
*
* Values as modified are:
* - window.screen.width
* - window.screen.height
* - window.innerWidth
* - window.innerHeight
* - "device-width"/"device-height"-related CSS media query results
*
* @param {Object} options
* @param {number} options.width
* Overriding width value in pixels. 0 disables the override.
* @param {number} options.height
* Overriding height value in pixels. 0 disables the override.
* @param {number} options.deviceScaleFactor
* Overriding device scale factor value. 0 disables the override.
* @param {number} options.mobile [not supported]
* Whether to emulate a mobile device. This includes viewport meta tag,
* overlay scrollbars, text autosizing and more.
* @param {number} options.screenOrientation
* Screen orientation override [not supported]
*/
async setDeviceMetricsOverride(options = {}) {
const { width, height, deviceScaleFactor } = options;
if (
width < 0 ||
width > MAX_WINDOW_SIZE ||
height < 0 ||
height > MAX_WINDOW_SIZE
) {
throw new TypeError(
`Width and height values must be positive, not greater than ${MAX_WINDOW_SIZE}`
);
}
if (typeof deviceScaleFactor != "number") {
throw new TypeError("deviceScaleFactor: number expected");
}
if (deviceScaleFactor < 0) {
throw new TypeError("deviceScaleFactor: must be positive");
}
const { tab } = this.session.target;
const { linkedBrowser: browser } = tab;
const { browsingContext } = this.session.target;
browsingContext.overrideDPPX = deviceScaleFactor;
// With a value of 0 the current size is used
const { layoutViewport } = await this.session.execute(
this.session.id,
"Page",
"getLayoutMetrics"
);
const targetWidth = width > 0 ? width : layoutViewport.clientWidth;
const targetHeight = height > 0 ? height : layoutViewport.clientHeight;
browser.style.setProperty("min-width", targetWidth + "px");
browser.style.setProperty("max-width", targetWidth + "px");
browser.style.setProperty("min-height", targetHeight + "px");
browser.style.setProperty("max-height", targetHeight + "px");
// Wait until the viewport has been resized
await this.executeInChild("_awaitViewportDimensions", {
width: targetWidth,
height: targetHeight,
});
}
/**
* Enables touch on platforms which do not support them.
*
* @param {Object} options
* @param {boolean} options.enabled
* Whether the touch event emulation should be enabled.
* @param {number=} options.maxTouchPoints [not yet supported]
* Maximum touch points supported. Defaults to one.
*/
async setTouchEmulationEnabled(options = {}) {
const { enabled } = options;
if (typeof enabled != "boolean") {
throw new TypeError(
"Invalid parameters (enabled: boolean value expected)"
);
}
const { browsingContext } = this.session.target;
if (enabled) {
browsingContext.touchEventsOverride = "enabled";
} else {
browsingContext.touchEventsOverride = "none";
}
}
/**
* Allows overriding user agent with the given string.
*
* @param {Object} options
* @param {string} options.userAgent
* User agent to use.
* @param {string=} options.acceptLanguage [not yet supported]
* Browser langugage to emulate.
* @param {string=} options.platform
* The platform navigator.platform should return.
*/
async setUserAgentOverride(options = {}) {
const { userAgent, platform } = options;
if (typeof userAgent != "string") {
throw new TypeError(
"Invalid parameters (userAgent: string value expected)"
);
}
if (!["undefined", "string"].includes(typeof platform)) {
throw new TypeError("platform: string value expected");
}
const { browsingContext } = this.session.target;
if (!userAgent.length) {
browsingContext.customUserAgent = null;
} else if (this._isValidHTTPRequestHeaderValue(userAgent)) {
browsingContext.customUserAgent = userAgent;
} else {
throw new TypeError("Invalid characters found in userAgent");
}
if (platform?.length > 0) {
browsingContext.customPlatform = platform;
} else {
browsingContext.customPlatform = null;
}
}
_isValidHTTPRequestHeaderValue(value) {
try {
const channel = lazy.NetUtil.newChannel({
uri: "http://localhost",
loadUsingSystemPrincipal: true,
});
channel.QueryInterface(Ci.nsIHttpChannel);
channel.setRequestHeader("X-check", value, false);
return true;
} catch (e) {
return false;
}
}
}
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