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/* -*- indent-tabs-mode: nil; js-indent-level: 2 -*- */
/* 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/. */
var EXPORTED_SYMBOLS = ["ClickHandlerChild"];
const { Services } = ChromeUtils.import("resource://gre/modules/Services.jsm");
ChromeUtils.defineModuleGetter(
this,
"BrowserUtils",
"resource://gre/modules/BrowserUtils.jsm"
);
ChromeUtils.defineModuleGetter(
this,
"PrivateBrowsingUtils",
"resource://gre/modules/PrivateBrowsingUtils.jsm"
);
ChromeUtils.defineModuleGetter(
this,
"WebNavigationFrames",
"resource://gre/modules/WebNavigationFrames.jsm"
);
ChromeUtils.defineModuleGetter(
this,
"E10SUtils",
"resource://gre/modules/E10SUtils.jsm"
);
class ClickHandlerChild extends JSWindowActorChild {
handleEvent(event) {
if (
!event.isTrusted ||
event.defaultPrevented ||
event.button == 2 ||
(event.type == "click" && event.button == 1)
) {
return;
}
// Don't do anything on editable things, we shouldn't open links in
// contenteditables, and editor needs to possibly handle middlemouse paste
let composedTarget = event.composedTarget;
if (
composedTarget.isContentEditable ||
(composedTarget.ownerDocument &&
composedTarget.ownerDocument.designMode == "on") ||
ChromeUtils.getClassName(composedTarget) == "HTMLInputElement" ||
ChromeUtils.getClassName(composedTarget) == "HTMLTextAreaElement"
) {
return;
}
let originalTarget = event.originalTarget;
let ownerDoc = originalTarget.ownerDocument;
if (!ownerDoc) {
return;
}
// Handle click events from about pages
if (event.button == 0) {
if (ownerDoc.documentURI.startsWith("about:blocked")) {
return;
}
}
let [href, node, principal] = this._hrefAndLinkNodeForClickEvent(event);
let csp = ownerDoc.csp;
if (csp) {
csp = E10SUtils.serializeCSP(csp);
}
let referrerInfo = Cc["@mozilla.org/referrer-info;1"].createInstance(
Ci.nsIReferrerInfo
);
if (node) {
referrerInfo.initWithElement(node);
} else {
referrerInfo.initWithDocument(ownerDoc);
}
referrerInfo = E10SUtils.serializeReferrerInfo(referrerInfo);
let frameID = WebNavigationFrames.getFrameId(ownerDoc.defaultView);
let json = {
button: event.button,
shiftKey: event.shiftKey,
ctrlKey: event.ctrlKey,
metaKey: event.metaKey,
altKey: event.altKey,
href: null,
title: null,
frameID,
triggeringPrincipal: principal,
csp,
referrerInfo,
originAttributes: principal ? principal.originAttributes : {},
isContentWindowPrivate: PrivateBrowsingUtils.isContentWindowPrivate(
ownerDoc.defaultView
),
};
if (href) {
try {
BrowserUtils.urlSecurityCheck(href, principal);
} catch (e) {
return;
}
json.href = href;
if (node) {
json.title = node.getAttribute("title");
}
// Check if the link needs to be opened with mixed content allowed.
// Only when the owner doc has |mixedContentChannel| and the same origin
// should we allow mixed content.
json.allowMixedContent = false;
let docshell = ownerDoc.defaultView.docShell;
if (this.docShell.mixedContentChannel) {
const sm = Services.scriptSecurityManager;
try {
let targetURI = Services.io.newURI(href);
let isPrivateWin =
ownerDoc.nodePrincipal.originAttributes.privateBrowsingId > 0;
sm.checkSameOriginURI(
docshell.mixedContentChannel.URI,
targetURI,
false,
isPrivateWin
);
json.allowMixedContent = true;
} catch (e) {}
}
json.originPrincipal = ownerDoc.nodePrincipal;
json.originStoragePrincipal = ownerDoc.effectiveStoragePrincipal;
json.triggeringPrincipal = ownerDoc.nodePrincipal;
// If a link element is clicked with middle button, user wants to open
// the link somewhere rather than pasting clipboard content. Therefore,
// when it's clicked with middle button, we should prevent multiple
// actions here to avoid leaking clipboard content unexpectedly.
// Note that whether the link will work actually or not does not matter
// because in this case, user does not intent to paste clipboard content.
if (event.button === 1) {
event.preventMultipleActions();
}
this.sendAsyncMessage("Content:Click", json);
return;
}
// This might be middle mouse navigation.
if (event.button == 1) {
this.sendAsyncMessage("Content:Click", json);
}
}
/**
* Extracts linkNode and href for the current click target.
*
* @param event
* The click event.
* @return [href, linkNode, linkPrincipal].
*
* @note linkNode will be null if the click wasn't on an anchor
* element. This includes SVG links, because callers expect |node|
* to behave like an <a> element, which SVG links (XLink) don't.
*/
_hrefAndLinkNodeForClickEvent(event) {
let content = this.contentWindow;
function isHTMLLink(aNode) {
// Be consistent with what nsContextMenu.js does.
return (
(aNode instanceof content.HTMLAnchorElement && aNode.href) ||
(aNode instanceof content.HTMLAreaElement && aNode.href) ||
aNode instanceof content.HTMLLinkElement
);
}
let node = event.composedTarget;
while (node && !isHTMLLink(node)) {
node = node.flattenedTreeParentNode;
}
if (node) {
return [node.href, node, node.ownerDocument.nodePrincipal];
}
// If there is no linkNode, try simple XLink.
let href, baseURI;
node = event.composedTarget;
while (node && !href) {
if (
node.nodeType == content.Node.ELEMENT_NODE &&
(node.localName == "a" ||
node.namespaceURI == "http://www.w3.org/1998/Math/MathML")
) {
href =
node.getAttribute("href") ||
node.getAttributeNS("http://www.w3.org/1999/xlink", "href");
if (href) {
baseURI = node.ownerDocument.baseURIObject;
break;
}
}
node = node.flattenedTreeParentNode;
}
// In case of XLink, we don't return the node we got href from since
// callers expect <a>-like elements.
// Note: makeURI() will throw if aUri is not a valid URI.
return [
href ? Services.io.newURI(href, null, baseURI).spec : null,
null,
node && node.ownerDocument.nodePrincipal,
];
}
}
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