fix(node): Remove Cookie header from requestdata.headers if cookies should not be sent to Sentry (#5898)

When using the `Sentry.requestMiddleware` in Node (Express), users have the option to define which properties of the incoming requests should be added to the event that is sent to Sentry. Among other options, they can set

* `headers` to add the request's http headers to `event.request.headers`
* `cookies` to add the request's cookies to `event.request.cookies`

However, there is a problem if `cookies` is not specified but `headers` is: The `Cookie` http header of the incoming request is still added to `event.request.headers` as it is treated like a normal http header. Therefore, cookie data (potentially containing sensitive data) is added to the event although users expect it to not be added.

This patch this behaviour by removing the `Cookie` http header from the collected headers, if `cookies` is not specified in the requestHandler options but `headers` is. Additionally, it adds two tests to check this new behaviour.

fixes #5458

Author: Lms24

packages/node/src/requestdata.ts

@@ -174,6 +174,12 @@ export function extractRequestData(
     switch (key) {
       case 'headers': {
         requestData.headers = headers;
+
+        // Remove the Cookie header in case cookie data should not be included in the event
+        if (!include.includes('cookies')) {
+          delete (requestData.headers as { cookie?: string }).cookie;
+        }
+
         break;
       }
       case 'method': {

packages/node/test/requestdata.test.ts

@@ -298,6 +298,37 @@ describe.each([oldExtractRequestData, newExtractRequestData])(
         });
       });
 
+      describe('headers', () => {
+        it('removes the `Cookie` header from requestdata.headers, if `cookies` is not set in the options', () => {
+          const mockReq = {
+            cookies: { foo: 'bar' },
+            headers: { cookie: 'foo=bar', otherHeader: 'hello' },
+          };
+          const optionsWithCookies = ['headers'];
+
+          const [req, options] = formatArgs(fn, mockReq, optionsWithCookies);
+
+          expect(fn(req, options as any)).toStrictEqual({
+            headers: { otherHeader: 'hello' },
+          });
+        });
+
+        it('includes the `Cookie` header in requestdata.headers, if `cookies` is not set in the options', () => {
+          const mockReq = {
+            cookies: { foo: 'bar' },
+            headers: { cookie: 'foo=bar', otherHeader: 'hello' },
+          };
+          const optionsWithCookies = ['headers', 'cookies'];
+
+          const [req, options] = formatArgs(fn, mockReq, optionsWithCookies);
+
+          expect(fn(req, options as any)).toStrictEqual({
+            headers: { otherHeader: 'hello', cookie: 'foo=bar' },
+            cookies: { foo: 'bar' },
+          });
+        });
+      });
+
       describe('cookies', () => {
         it('uses `req.cookies` if available', () => {
           const mockReq = {