inspector: support undici traffic data inspection

Support undici sent and received data inspection in Chrome DevTools.

PR-URL: #58953
Reviewed-By: Ryuhei Shima <shimaryuhei@gmail.com>
Reviewed-By: Moshe Atlow <moshe@atlow.co.il>

Author: legendecas

lib/internal/inspector/network.js

@@ -2,6 +2,7 @@
 
 const {
   NumberMAX_SAFE_INTEGER,
+  StringPrototypeToLowerCase,
   Symbol,
 } = primordials;
 
@@ -52,8 +53,8 @@ function sniffMimeType(contentType) {
   let charset;
   try {
     const mimeTypeObj = new MIMEType(contentType);
-    mimeType = mimeTypeObj.essence || '';
-    charset = mimeTypeObj.params.get('charset') || '';
+    mimeType = StringPrototypeToLowerCase(mimeTypeObj.essence || '');
+    charset = StringPrototypeToLowerCase(mimeTypeObj.params.get('charset') || '');
   } catch {
     mimeType = '';
     charset = '';

lib/internal/inspector/network_undici.js

@@ -2,6 +2,7 @@
 
 const {
   DateNow,
+  StringPrototypeToLowerCase,
 } = primordials;
 
 const {
@@ -13,16 +14,25 @@ const {
 } = require('internal/inspector/network');
 const dc = require('diagnostics_channel');
 const { Network } = require('inspector');
+const { Buffer } = require('buffer');
 
 // Convert an undici request headers array to a plain object (Map<string, string>)
 function requestHeadersArrayToDictionary(headers) {
   const dict = {};
+  let charset;
+  let mimeType;
   for (let idx = 0; idx < headers.length; idx += 2) {
     const key = `${headers[idx]}`;
     const value = `${headers[idx + 1]}`;
     dict[key] = value;
+
+    if (StringPrototypeToLowerCase(key) === 'content-type') {
+      const result = sniffMimeType(value);
+      charset = result.charset;
+      mimeType = result.mimeType;
+    }
   }
-  return dict;
+  return [dict, charset, mimeType];
 };
 
 // Convert an undici response headers array to a plain object (Map<string, string>)
@@ -32,7 +42,7 @@ function responseHeadersArrayToDictionary(headers) {
   let mimeType;
   for (let idx = 0; idx < headers.length; idx += 2) {
     const key = `${headers[idx]}`;
-    const lowerCasedKey = key.toLowerCase();
+    const lowerCasedKey = StringPrototypeToLowerCase(key);
     const value = `${headers[idx + 1]}`;
     const prevValue = dict[key];
 
@@ -63,8 +73,7 @@ function onClientRequestStart({ request }) {
   const url = `${request.origin}${request.path}`;
   request[kInspectorRequestId] = getNextRequestId();
 
-  const headers = requestHeadersArrayToDictionary(request.headers);
-  const { charset } = sniffMimeType(headers);
+  const { 0: headers, 1: charset } = requestHeadersArrayToDictionary(request.headers);
 
   Network.requestWillBeSent({
     requestId: request[kInspectorRequestId],
@@ -74,7 +83,8 @@ function onClientRequestStart({ request }) {
     request: {
       url,
       method: request.method,
-      headers: requestHeadersArrayToDictionary(request.headers),
+      headers: headers,
+      hasPostData: request.body != null,
     },
   });
 }
@@ -97,6 +107,40 @@ function onClientRequestError({ request, error }) {
   });
 }
 
+/**
+ * When a chunk of the request body is being sent, cache it until `getRequestPostData` request.
+ * https://chromedevtools.github.io/devtools-protocol/1-3/Network/#method-getRequestPostData
+ * @param {{ request: undici.Request, chunk: Uint8Array | string }} event
+ */
+function onClientRequestBodyChunkSent({ request, chunk }) {
+  if (typeof request[kInspectorRequestId] !== 'string') {
+    return;
+  }
+
+  const buffer = Buffer.from(chunk);
+  Network.dataSent({
+    requestId: request[kInspectorRequestId],
+    timestamp: getMonotonicTime(),
+    dataLength: buffer.byteLength,
+    data: buffer,
+  });
+}
+
+/**
+ * Mark a request body as fully sent.
+ * @param {{request: undici.Request}} event
+ */
+function onClientRequestBodySent({ request }) {
+  if (typeof request[kInspectorRequestId] !== 'string') {
+    return;
+  }
+
+  Network.dataSent({
+    requestId: request[kInspectorRequestId],
+    finished: true,
+  });
+}
+
 /**
  * When response headers are received, emit Network.responseReceived event.
  * https://chromedevtools.github.io/devtools-protocol/1-3/Network/#event-responseReceived
@@ -126,6 +170,27 @@ function onClientResponseHeaders({ request, response }) {
   });
 }
 
+/**
+ * When a chunk of the response body has been received, cache it until `getResponseBody` request
+ * https://chromedevtools.github.io/devtools-protocol/1-3/Network/#method-getResponseBody or
+ * stream it with `streamResourceContent` request.
+ * https://chromedevtools.github.io/devtools-protocol/tot/Network/#method-streamResourceContent
+ * @param {{ request: undici.Request, chunk: Uint8Array | string }} event
+ */
+function onClientRequestBodyChunkReceived({ request, chunk }) {
+  if (typeof request[kInspectorRequestId] !== 'string') {
+    return;
+  }
+
+  Network.dataReceived({
+    requestId: request[kInspectorRequestId],
+    timestamp: getMonotonicTime(),
+    dataLength: chunk.byteLength,
+    encodedDataLength: chunk.byteLength,
+    data: chunk,
+  });
+}
+
 /**
  * When a response is completed, emit Network.loadingFinished event.
  * https://chromedevtools.github.io/devtools-protocol/1-3/Network/#event-loadingFinished
@@ -146,13 +211,19 @@ function enable() {
   dc.subscribe('undici:request:error', onClientRequestError);
   dc.subscribe('undici:request:headers', onClientResponseHeaders);
   dc.subscribe('undici:request:trailers', onClientResponseFinish);
+  dc.subscribe('undici:request:bodyChunkSent', onClientRequestBodyChunkSent);
+  dc.subscribe('undici:request:bodySent', onClientRequestBodySent);
+  dc.subscribe('undici:request:bodyChunkReceived', onClientRequestBodyChunkReceived);
 }
 
 function disable() {
   dc.unsubscribe('undici:request:create', onClientRequestStart);
   dc.unsubscribe('undici:request:error', onClientRequestError);
   dc.unsubscribe('undici:request:headers', onClientResponseHeaders);
   dc.unsubscribe('undici:request:trailers', onClientResponseFinish);
+  dc.unsubscribe('undici:request:bodyChunkSent', onClientRequestBodyChunkSent);
+  dc.unsubscribe('undici:request:bodySent', onClientRequestBodySent);
+  dc.unsubscribe('undici:request:bodyChunkReceived', onClientRequestBodyChunkReceived);
 }
 
 module.exports = {