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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/. */
"use strict";
var Cc = Components.classes;
var Ci = Components.interfaces;
var Cu = Components.utils;
this.EXPORTED_SYMBOLS = [ "ContentLinkHandler" ];
Cu.import("resource://gre/modules/XPCOMUtils.jsm");
Cu.import("resource://gre/modules/Services.jsm");
Cu.import("resource://gre/modules/NetUtil.jsm");
XPCOMUtils.defineLazyModuleGetter(this, "Feeds",
"resource:///modules/Feeds.jsm");
XPCOMUtils.defineLazyModuleGetter(this, "BrowserUtils",
"resource://gre/modules/BrowserUtils.jsm");
const SIZES_TELEMETRY_ENUM = {
NO_SIZES: 0,
ANY: 1,
DIMENSION: 2,
INVALID: 3,
};
this.ContentLinkHandler = {
init(chromeGlobal) {
chromeGlobal.addEventListener("DOMLinkAdded", (event) => {
this.onLinkEvent(event, chromeGlobal);
});
chromeGlobal.addEventListener("DOMLinkChanged", (event) => {
this.onLinkEvent(event, chromeGlobal);
});
},
onLinkEvent(event, chromeGlobal) {
var link = event.originalTarget;
var rel = link.rel && link.rel.toLowerCase();
if (!link || !link.ownerDocument || !rel || !link.href)
return;
// Ignore sub-frames (bugs 305472, 479408).
let window = link.ownerGlobal;
if (window != window.top)
return;
var feedAdded = false;
var iconAdded = false;
var searchAdded = false;
var rels = {};
for (let relString of rel.split(/\s+/))
rels[relString] = true;
for (let relVal in rels) {
switch (relVal) {
case "feed":
case "alternate":
if (!feedAdded && event.type == "DOMLinkAdded") {
if (!rels.feed && rels.alternate && rels.stylesheet)
break;
if (Feeds.isValidFeed(link, link.ownerDocument.nodePrincipal, "feed" in rels)) {
chromeGlobal.sendAsyncMessage("Link:AddFeed",
{type: link.type,
href: link.href,
title: link.title});
feedAdded = true;
}
}
break;
case "icon":
if (iconAdded || !Services.prefs.getBoolPref("browser.chrome.site_icons"))
break;
var uri = this.getLinkIconURI(link);
if (!uri)
break;
// Telemetry probes for measuring the sizes attribute
// usage and available dimensions.
let sizeHistogramTypes = Services.telemetry.
getHistogramById("LINK_ICON_SIZES_ATTR_USAGE");
let sizeHistogramDimension = Services.telemetry.
getHistogramById("LINK_ICON_SIZES_ATTR_DIMENSION");
let sizesType;
if (link.sizes.length) {
for (let size of link.sizes) {
if (size.toLowerCase() == "any") {
sizesType = SIZES_TELEMETRY_ENUM.ANY;
break;
} else {
let re = /^([1-9][0-9]*)x[1-9][0-9]*$/i;
let values = re.exec(size);
if (values && values.length > 1) {
sizesType = SIZES_TELEMETRY_ENUM.DIMENSION;
sizeHistogramDimension.add(parseInt(values[1]));
} else {
sizesType = SIZES_TELEMETRY_ENUM.INVALID;
break;
}
}
}
} else {
sizesType = SIZES_TELEMETRY_ENUM.NO_SIZES;
}
sizeHistogramTypes.add(sizesType);
chromeGlobal.sendAsyncMessage(
"Link:SetIcon",
{url: uri.spec, loadingPrincipal: link.ownerDocument.nodePrincipal});
iconAdded = true;
break;
case "search":
if (!searchAdded && event.type == "DOMLinkAdded") {
var type = link.type && link.type.toLowerCase();
type = type.replace(/^\s+|\s*(?:;.*)?$/g, "");
let re = /^(?:https?|ftp):/i;
if (type == "application/opensearchdescription+xml" && link.title &&
re.test(link.href)) {
let engine = { title: link.title, href: link.href };
chromeGlobal.sendAsyncMessage("Link:AddSearch",
{engine,
url: link.ownerDocument.documentURI});
searchAdded = true;
}
}
break;
}
}
},
getLinkIconURI(aLink) {
let targetDoc = aLink.ownerDocument;
var uri = BrowserUtils.makeURI(aLink.href, targetDoc.characterSet);
try {
uri.userPass = "";
} catch (e) {
// some URIs are immutable
}
return uri;
},
};
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