1 files changed, 177 insertions, 0 deletions
diff --git a/browser/actors/ClickHandlerChild.sys.mjs b/browser/actors/ClickHandlerChild.sys.mjs
new file mode 100644
index 0000000000..c08b599856
--- /dev/null
+++ b/browser/actors/ClickHandlerChild.sys.mjs
@@ -0,0 +1,177 @@
+/* -*- 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/. */
+
+import { XPCOMUtils } from "resource://gre/modules/XPCOMUtils.sys.mjs";
+
+const lazy = {};
+
+ChromeUtils.defineESModuleGetters(lazy, {
+  BrowserUtils: "resource://gre/modules/BrowserUtils.sys.mjs",
+  E10SUtils: "resource://gre/modules/E10SUtils.sys.mjs",
+});
+
+export class MiddleMousePasteHandlerChild extends JSWindowActorChild {
+  handleEvent(clickEvent) {
+    if (
+      clickEvent.defaultPrevented ||
+      clickEvent.button != 1 ||
+      MiddleMousePasteHandlerChild.autoscrollEnabled
+    ) {
+      return;
+    }
+    this.manager
+      .getActor("ClickHandler")
+      .handleClickEvent(
+        clickEvent,
+        /* is from middle mouse paste handler */ true
+      );
+  }
+
+  onProcessedClick(data) {
+    this.sendAsyncMessage("MiddleClickPaste", data);
+  }
+}
+
+XPCOMUtils.defineLazyPreferenceGetter(
+  MiddleMousePasteHandlerChild,
+  "autoscrollEnabled",
+  "general.autoScroll",
+  true
+);
+
+export class ClickHandlerChild extends JSWindowActorChild {
+  handleEvent(wrapperEvent) {
+    this.handleClickEvent(wrapperEvent.sourceEvent);
+  }
+
+  handleClickEvent(event, isFromMiddleMousePasteHandler = false) {
+    if (event.defaultPrevented || event.button == 2) {
+      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;
+      }
+    }
+
+    // For untrusted events, require a valid transient user gesture activation.
+    if (!event.isTrusted && !ownerDoc.hasValidTransientUserGestureActivation) {
+      return;
+    }
+
+    let [
+      href,
+      node,
+      principal,
+    ] = lazy.BrowserUtils.hrefAndLinkNodeForClickEvent(event);
+
+    let csp = ownerDoc.csp;
+    if (csp) {
+      csp = lazy.E10SUtils.serializeCSP(csp);
+    }
+
+    let referrerInfo = Cc["@mozilla.org/referrer-info;1"].createInstance(
+      Ci.nsIReferrerInfo
+    );
+    if (node) {
+      referrerInfo.initWithElement(node);
+    } else {
+      referrerInfo.initWithDocument(ownerDoc);
+    }
+    referrerInfo = lazy.E10SUtils.serializeReferrerInfo(referrerInfo);
+
+    let json = {
+      button: event.button,
+      shiftKey: event.shiftKey,
+      ctrlKey: event.ctrlKey,
+      metaKey: event.metaKey,
+      altKey: event.altKey,
+      href: null,
+      title: null,
+      csp,
+      referrerInfo,
+    };
+
+    if (href && !isFromMiddleMousePasteHandler) {
+      try {
+        Services.scriptSecurityManager.checkLoadURIStrWithPrincipal(
+          principal,
+          href
+        );
+      } catch (e) {
+        return;
+      }
+
+      if (
+        !event.isTrusted &&
+        lazy.BrowserUtils.whereToOpenLink(event) != "current"
+      ) {
+        // If we'll open the link, we want to consume the user gesture
+        // activation to ensure that we don't allow multiple links to open
+        // from one user gesture.
+        // Avoid doing so for links opened in the current tab, which get
+        // handled later, by gecko, as otherwise its popup blocker will stop
+        // the link from opening.
+        // We will do the same check (whereToOpenLink) again in the parent and
+        // avoid handling the click for such links... but we still need the
+        // click information in the parent because otherwise places link
+        // tracking breaks. (bug 1742894 tracks improving this.)
+        ownerDoc.consumeTransientUserGestureActivation();
+        // We don't care about the return value because we already checked that
+        // hasValidTransientUserGestureActivation was true earlier in this
+        // function.
+      }
+
+      json.href = href;
+      if (node) {
+        json.title = node.getAttribute("title");
+      }
+
+      if (
+        (ownerDoc.URL === "about:newtab" || ownerDoc.URL === "about:home") &&
+        node.dataset.isSponsoredLink === "true"
+      ) {
+        json.globalHistoryOptions = { triggeringSponsoredURL: href };
+      }
+
+      // 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.
+      // We also need to do this to prevent multiple tabs opening if there are
+      // nested link elements.
+      event.preventMultipleActions();
+
+      this.sendAsyncMessage("Content:Click", json);
+    }
+
+    // This might be middle mouse navigation, in which case pass this back:
+    if (!href && event.button == 1 && isFromMiddleMousePasteHandler) {
+      this.manager.getActor("MiddleMousePasteHandler").onProcessedClick(json);
+    }
+  }
+}