import FIREFOX_52_6_0esr_RELEASE from mozilla-esr52 hg repo

browser/modules/ContentLinkHandler.jsm

@@ -0,0 +1,147 @@
+/* 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: function(chromeGlobal) {
+    chromeGlobal.addEventListener("DOMLinkAdded", (event) => {
+      this.onLinkEvent(event, chromeGlobal);
+    }, false);
+    chromeGlobal.addEventListener("DOMLinkChanged", (event) => {
+      this.onLinkEvent(event, chromeGlobal);
+    }, false);
+  },
+
+  onLinkEvent: function(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: engine,
+                                             url: link.ownerDocument.documentURI});
+              searchAdded = true;
+            }
+          }
+          break;
+      }
+    }
+  },
+
+  getLinkIconURI: function(aLink) {
+    let targetDoc = aLink.ownerDocument;
+    var uri = BrowserUtils.makeURI(aLink.href, targetDoc.characterSet);
+    try {
+      uri.userPass = "";
+    } catch (e) {
+      // some URIs are immutable
+    }
+    return uri;
+  },
+};