From 2f42997be1f19f8383d2932cc39b995a6d16e32b Mon Sep 17 00:00:00 2001
From: Denver Coneybeare <dconeybe@google.com>
Date: Wed, 12 Apr 2023 19:51:48 +0000
Subject: [PATCH 1/2] Md5 class added to webchannel-wrapper

---
 packages/webchannel-wrapper/src/index.d.ts | 9 +++++++++
 packages/webchannel-wrapper/src/index.js   | 6 ++++++
 2 files changed, 15 insertions(+)

diff --git a/packages/webchannel-wrapper/src/index.d.ts b/packages/webchannel-wrapper/src/index.d.ts
index 4a1f45f1d70..93debc4aa6e 100644
--- a/packages/webchannel-wrapper/src/index.d.ts
+++ b/packages/webchannel-wrapper/src/index.d.ts
@@ -136,3 +136,12 @@ export function getStatEventTarget(): EventTarget;
 export class FetchXmlHttpFactory {
   constructor(options: {});
 }
+
+// See https://google.github.io/closure-library/api/goog.crypt.Md5.html
+// Unit test are written in
+// packages/firestore/test/unit/core/webchannel_wrapper.test.ts
+export class Md5 {
+  reset(): void;
+  digest(): Array<number>;
+  update(bytes: Array<number> | Uint8Array | string, opt_length?: number): void;
+}
diff --git a/packages/webchannel-wrapper/src/index.js b/packages/webchannel-wrapper/src/index.js
index c51f7d68ba3..9b6b0a026ed 100644
--- a/packages/webchannel-wrapper/src/index.js
+++ b/packages/webchannel-wrapper/src/index.js
@@ -78,6 +78,11 @@ goog.net.XhrIo.prototype['send'] = goog.net.XhrIo.prototype.send;
 goog.net.XhrIo.prototype['setWithCredentials'] =
   goog.net.XhrIo.prototype.setWithCredentials;
 
+goog.require('goog.crypt.Md5');
+goog.crypt.Md5.prototype['digest'] = goog.crypt.Md5.prototype.digest;
+goog.crypt.Md5.prototype['reset'] = goog.crypt.Md5.prototype.reset;
+goog.crypt.Md5.prototype['update'] = goog.crypt.Md5.prototype.update;
+
 module['exports']['createWebChannelTransport'] =
   goog.net.createWebChannelTransport;
 module['exports']['getStatEventTarget'] =
@@ -89,3 +94,4 @@ module['exports']['Stat'] = goog.labs.net.webChannel.requestStats.Stat;
 module['exports']['FetchXmlHttpFactory'] = goog.net.FetchXmlHttpFactory;
 module['exports']['WebChannel'] = goog.net.WebChannel;
 module['exports']['XhrIo'] = goog.net.XhrIo;
+module['exports']['Md5'] = goog.crypt.Md5;

From 71d2af5e6cbdd6922d84c5b9af97ac1ec9abc0fd Mon Sep 17 00:00:00 2001
From: Denver Coneybeare <dconeybe@google.com>
Date: Wed, 12 Apr 2023 16:09:22 -0400
Subject: [PATCH 2/2] webchannel_connection.ts: add a usage of the Md5 class so
 it doesn't get tree-shaken away

---
 .../src/platform/browser/webchannel_connection.ts     | 11 ++++++++++-
 1 file changed, 10 insertions(+), 1 deletion(-)

diff --git a/packages/firestore/src/platform/browser/webchannel_connection.ts b/packages/firestore/src/platform/browser/webchannel_connection.ts
index c7eeec0f7f1..2e915a2ee6b 100644
--- a/packages/firestore/src/platform/browser/webchannel_connection.ts
+++ b/packages/firestore/src/platform/browser/webchannel_connection.ts
@@ -23,6 +23,7 @@ import {
   WebChannelError,
   WebChannelOptions,
   FetchXmlHttpFactory,
+  Md5,
   XhrIo,
   getStatEventTarget,
   EventTarget,
@@ -95,12 +96,20 @@ export class WebChannelConnection extends RestConnection {
               break;
             case ErrorCode.HTTP_ERROR:
               const status = xhr.getStatus();
+
+              const md5 = new Md5();
+              md5.update([1, 2, 3, 4]);
+              md5.reset();
+              md5.update([4, 3, 2, 1]);
+              const value = md5.digest();
+
               logDebug(
                 LOG_TAG,
                 `RPC '${rpcName}' ${streamId} failed with status:`,
                 status,
                 'response text:',
-                xhr.getResponseText()
+                xhr.getResponseText(),
+                `${value}`
               );
               if (status > 0) {
                 let response = xhr.getResponseJson();