browser(firefox): do not send post data > 10Mb to the client (#12969)

browser_patches/firefox-beta/BUILD_NUMBER

@@ -1,2 +1,2 @@
-1319
-Changed: yurys@chromium.org Fri 18 Mar 2022 05:39:20 PM PDT
+1320
+Changed: yurys@chromium.org Tue 22 Mar 2022 05:26:17 PM PDT

browser_patches/firefox-beta/juggler/NetworkObserver.js

@@ -754,10 +754,14 @@ function readRequestPostData(httpChannel) {
   }
 
   // Read data from the stream.
-  let result = '';
+  let result = undefined;
   try {
-    const buffer = NetUtil.readInputStreamToString(iStream, iStream.available());
-    result = btoa(buffer);
+    const maxLen = iStream.available();
+    // Cap at 10Mb.
+    if (maxLen <= 10 * 1024 * 1024) {
+      const buffer = NetUtil.readInputStreamToString(iStream, maxLen);
+      result = btoa(buffer);
+    }
   } catch (err) {
   }
 

browser_patches/firefox/BUILD_NUMBER

@@ -1,2 +1,2 @@
-1320
-Changed: yurys@chromium.org Fri 18 Mar 2022 05:34:13 PM PDT
+1321
+Changed: yurys@chromium.org Tue 22 Mar 2022 05:24:48 PM PDT

browser_patches/firefox/juggler/NetworkObserver.js

@@ -754,10 +754,14 @@ function readRequestPostData(httpChannel) {
   }
 
   // Read data from the stream.
-  let result = '';
+  let result = undefined;
   try {
-    const buffer = NetUtil.readInputStreamToString(iStream, iStream.available());
-    result = btoa(buffer);
+    const maxLen = iStream.available();
+    // Cap at 10Mb.
+    if (maxLen <= 10 * 1024 * 1024) {
+      const buffer = NetUtil.readInputStreamToString(iStream, maxLen);
+      result = btoa(buffer);
+    }
   } catch (err) {
   }