From 4197a81f1e81ceb57e6cbab566e82727c7554ab8 Mon Sep 17 00:00:00 2001
From: hackademix <giorgio@maone.net>
Date: Tue, 31 Jul 2018 00:49:30 +0200
Subject: Stateful response processing support.

---
 bg/ResponseProcessor.js | 12 ++++--------
 1 file changed, 4 insertions(+), 8 deletions(-)

diff --git a/bg/ResponseProcessor.js b/bg/ResponseProcessor.js
index 400cb42..0d6e36f 100644
--- a/bg/ResponseProcessor.js
+++ b/bg/ResponseProcessor.js
@@ -73,8 +73,9 @@ class ResponseTextFilter {
   process(handler) {
     if (!this.canProcess) return ResponseProcessor.ACCEPT;
     let {metaData, request} = this;
+    let response = {request, metaData}; // we keep it around allowing callbacks to store state
     if (typeof handler.pre === "function") {
-      let res = handler.pre({request, metaData});
+      let res = handler.pre(response);
       if (res) return res;
       if (handler.post) handler = handler.post;
       if (typeof handler !== "function") ResponseProcessor.ACCEPT;
@@ -91,22 +92,17 @@ class ResponseTextFilter {
     filter.onstop = async event => {
       let decoder = metaData.createDecoder();
       let params = {stream: true};
-      let text = this.text = buffer.map(
+      response.text = buffer.map(
         chunk => decoder.decode(chunk, params))
         .join('');
       let editedText = null;
       try {
-        let response = {
-          request,
-          metaData,
-          text,
-        };
         editedText = await handler(response);
       } catch(e) {
         console.error(e);
       }
       if (metaData.forcedUTF8 ||
-        editedText !== null && text !== editedText) {
+        editedText !== null && response.text !== editedText) {
         // if we changed the charset, the text or both, let's re-encode
         filter.write(new TextEncoder().encode(editedText));
       } else {
-- 
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