From 964f011409e824da52510c7de16a1c64ebae1787 Mon Sep 17 00:00:00 2001
From: toasted-nutbread <toasted-nutbread@users.noreply.github.com>
Date: Fri, 10 Jul 2020 22:13:11 -0400
Subject: [PATCH] Various updates to FrameOffsetForwarder (#657)

* Remove bindings

* Fast exit if same window

* Simplify selector

* Rename functions, reuse _getFrameOffsetParent

* Update message style

* Send reply message to a specific frame
---
 ext/fg/js/frame-offset-forwarder.js | 51 +++++++++++++++--------------
 ext/fg/js/frontend.js               |  2 +-
 2 files changed, 28 insertions(+), 25 deletions(-)

diff --git a/ext/fg/js/frame-offset-forwarder.js b/ext/fg/js/frame-offset-forwarder.js
index f692364a..94775105 100644
--- a/ext/fg/js/frame-offset-forwarder.js
+++ b/ext/fg/js/frame-offset-forwarder.js
@@ -20,20 +20,14 @@
  */
 
 class FrameOffsetForwarder {
-    constructor() {
+    constructor(frameId) {
+        this._frameId = frameId;
         this._isPrepared = false;
         this._cacheMaxSize = 1000;
         this._frameCache = new Set();
         this._unreachableContentWindowCache = new Set();
-
-        this._forwardFrameOffset = (
-            window !== window.parent ?
-            this._forwardFrameOffsetParent.bind(this) :
-            this._forwardFrameOffsetOrigin.bind(this)
-        );
-
         this._windowMessageHandlers = new Map([
-            ['getFrameOffset', ({offset, uniqueId}, e) => this._onGetFrameOffset(offset, uniqueId, e)]
+            ['getFrameOffset', this._onMessageGetFrameOffset.bind(this)]
         ]);
     }
 
@@ -44,6 +38,10 @@ class FrameOffsetForwarder {
     }
 
     async getOffset() {
+        if (window === window.parent) {
+            return [0, 0];
+        }
+
         const uniqueId = yomichan.generateId(16);
 
         const frameOffsetPromise = yomichan.getTemporaryListenerResult(
@@ -56,13 +54,7 @@ class FrameOffsetForwarder {
             5000
         );
 
-        window.parent.postMessage({
-            action: 'getFrameOffset',
-            params: {
-                uniqueId,
-                offset: [0, 0]
-            }
-        }, '*');
+        this._getFrameOffsetParent([0, 0], uniqueId, this._frameId);
 
         const {offset} = await frameOffsetPromise;
         return offset;
@@ -84,7 +76,7 @@ class FrameOffsetForwarder {
         }
     }
 
-    _onGetFrameOffset(offset, uniqueId, e) {
+    _onMessageGetFrameOffset({offset, uniqueId, frameId}, e) {
         let sourceFrame = null;
         if (!this._unreachableContentWindowCache.has(e.source)) {
             sourceFrame = this._findFrameWithContentWindow(e.source);
@@ -92,7 +84,7 @@ class FrameOffsetForwarder {
         if (sourceFrame === null) {
             // closed shadow root etc.
             this._addToCache(this._unreachableContentWindowCache, e.source);
-            this._forwardFrameOffsetOrigin(null, uniqueId);
+            this._replyFrameOffset(null, uniqueId, frameId);
             return;
         }
 
@@ -100,7 +92,11 @@ class FrameOffsetForwarder {
         const {x, y} = sourceFrame.getBoundingClientRect();
         offset = [forwardedX + x, forwardedY + y];
 
-        this._forwardFrameOffset(offset, uniqueId);
+        if (window === window.parent) {
+            this._replyFrameOffset(offset, uniqueId, frameId);
+        } else {
+            this._getFrameOffsetParent(offset, uniqueId, frameId);
+        }
     }
 
     _findFrameWithContentWindow(contentWindow) {
@@ -148,7 +144,7 @@ class FrameOffsetForwarder {
         }
         yield frameCache;
         // will contain duplicates, but frame elements are cheap to handle
-        yield [...document.querySelectorAll('frame, iframe:not(.yomichan-float)')];
+        yield [...document.querySelectorAll('frame,iframe')];
         yield [document.documentElement];
     }
 
@@ -164,11 +160,18 @@ class FrameOffsetForwarder {
         cache.add(value);
     }
 
-    _forwardFrameOffsetParent(offset, uniqueId) {
-        window.parent.postMessage({action: 'getFrameOffset', params: {offset, uniqueId}}, '*');
+    _getFrameOffsetParent(offset, uniqueId, frameId) {
+        window.parent.postMessage({
+            action: 'getFrameOffset',
+            params: {
+                offset,
+                uniqueId,
+                frameId
+            }
+        }, '*');
     }
 
-    _forwardFrameOffsetOrigin(offset, uniqueId) {
-        api.broadcastTab('frameOffset', {offset, uniqueId});
+    _replyFrameOffset(offset, uniqueId, frameId) {
+        api.sendMessageToFrame(frameId, 'frameOffset', {offset, uniqueId});
     }
 }
diff --git a/ext/fg/js/frontend.js b/ext/fg/js/frontend.js
index 67dbcf4b..1618fa12 100644
--- a/ext/fg/js/frontend.js
+++ b/ext/fg/js/frontend.js
@@ -56,7 +56,7 @@ class Frontend {
         this._isSearchPage = isSearchPage;
         this._depth = depth;
         this._frameId = frameId;
-        this._frameOffsetForwarder = new FrameOffsetForwarder();
+        this._frameOffsetForwarder = new FrameOffsetForwarder(frameId);
         this._popupFactory = popupFactory;
         this._allowRootFramePopupProxy = allowRootFramePopupProxy;
         this._popupCache = new Map();