1 files changed, 175 insertions, 0 deletions
diff --git a/browser/actors/LinkHandlerChild.sys.mjs b/browser/actors/LinkHandlerChild.sys.mjs
new file mode 100644
index 0000000000..95c86b2d0f
--- /dev/null
+++ b/browser/actors/LinkHandlerChild.sys.mjs
@@ -0,0 +1,175 @@
+/* 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/. */
+
+const lazy = {};
+
+ChromeUtils.defineESModuleGetters(lazy, {
+  FaviconLoader: "resource:///modules/FaviconLoader.sys.mjs",
+});
+
+export class LinkHandlerChild extends JSWindowActorChild {
+  constructor() {
+    super();
+
+    this.seenTabIcon = false;
+    this._iconLoader = null;
+  }
+
+  get iconLoader() {
+    if (!this._iconLoader) {
+      this._iconLoader = new lazy.FaviconLoader(this);
+    }
+    return this._iconLoader;
+  }
+
+  addRootIcon() {
+    if (
+      !this.seenTabIcon &&
+      Services.prefs.getBoolPref("browser.chrome.guess_favicon", true) &&
+      Services.prefs.getBoolPref("browser.chrome.site_icons", true)
+    ) {
+      // Inject the default icon. Use documentURIObject so that we do the right
+      // thing with about:-style error pages. See bug 453442
+      let pageURI = this.document.documentURIObject;
+      if (["http", "https"].includes(pageURI.scheme)) {
+        this.seenTabIcon = true;
+        this.iconLoader.addDefaultIcon(pageURI);
+      }
+    }
+  }
+
+  onHeadParsed(event) {
+    if (event.target.ownerDocument != this.document) {
+      return;
+    }
+
+    // Per spec icons are meant to be in the <head> tag so we should have seen
+    // all the icons now so add the root icon if no other tab icons have been
+    // seen.
+    this.addRootIcon();
+
+    // We're likely done with icon parsing so load the pending icons now.
+    if (this._iconLoader) {
+      this._iconLoader.onPageShow();
+    }
+  }
+
+  onPageShow(event) {
+    if (event.target != this.document) {
+      return;
+    }
+
+    this.addRootIcon();
+
+    if (this._iconLoader) {
+      this._iconLoader.onPageShow();
+    }
+  }
+
+  onPageHide(event) {
+    if (event.target != this.document) {
+      return;
+    }
+
+    if (this._iconLoader) {
+      this._iconLoader.onPageHide();
+    }
+
+    this.seenTabIcon = false;
+  }
+
+  onLinkEvent(event) {
+    let link = event.target;
+    // Ignore sub-frames (bugs 305472, 479408).
+    if (link.ownerGlobal != this.contentWindow) {
+      return;
+    }
+
+    let rel = link.rel && link.rel.toLowerCase();
+    // We also check .getAttribute, since an empty href attribute will give us
+    // a link.href that is the same as the document.
+    if (!rel || !link.href || !link.getAttribute("href")) {
+      return;
+    }
+
+    // Note: following booleans only work for the current link, not for the
+    // whole content
+    let iconAdded = false;
+    let searchAdded = false;
+    let rels = {};
+    for (let relString of rel.split(/\s+/)) {
+      rels[relString] = true;
+    }
+
+    for (let relVal in rels) {
+      let isRichIcon = false;
+
+      switch (relVal) {
+        case "apple-touch-icon":
+        case "apple-touch-icon-precomposed":
+        case "fluid-icon":
+          isRichIcon = true;
+        // fall through
+        case "icon":
+          if (iconAdded || link.hasAttribute("mask")) {
+            // Masked icons are not supported yet.
+            break;
+          }
+
+          if (!Services.prefs.getBoolPref("browser.chrome.site_icons", true)) {
+            return;
+          }
+
+          if (this.iconLoader.addIconFromLink(link, isRichIcon)) {
+            iconAdded = true;
+            if (!isRichIcon) {
+              this.seenTabIcon = true;
+            }
+          }
+          break;
+        case "search":
+          if (
+            Services.policies &&
+            !Services.policies.isAllowed("installSearchEngine")
+          ) {
+            break;
+          }
+
+          if (!searchAdded && event.type == "DOMLinkAdded") {
+            let type = link.type && link.type.toLowerCase();
+            type = type.replace(/^\s+|\s*(?:;.*)?$/g, "");
+
+            // Note: This protocol list should be kept in sync with
+            // the one in OpenSearchEngine's install function.
+            let re = /^https?:/i;
+            if (
+              type == "application/opensearchdescription+xml" &&
+              link.title &&
+              re.test(link.href)
+            ) {
+              let engine = { title: link.title, href: link.href };
+              this.sendAsyncMessage("Link:AddSearch", {
+                engine,
+              });
+              searchAdded = true;
+            }
+          }
+          break;
+      }
+    }
+  }
+
+  handleEvent(event) {
+    switch (event.type) {
+      case "pageshow":
+        return this.onPageShow(event);
+      case "pagehide":
+        return this.onPageHide(event);
+      case "DOMHeadElementParsed":
+        return this.onHeadParsed(event);
+      default:
+        return this.onLinkEvent(event);
+    }
+  }
+}