fix(core): Add sentry_client to auth headers (#5413)

This adds `sentry_client` to the auth headers* we send with every envelope request, as described [in the develop docs](https://develop.sentry.dev/sdk/overview/#authentication).

In order to have access to the SDK metadata, the full `ClientOptions` object is now passed to `getEnvelopeEndpointWithUrlEncodedAuth`. Despite the fact that this is really an internal function, it's exported, so in order to keep everything backwards-compatible, for the moment it will also accept a string as the second argument, as it has in the past. Finally, all of our internal uses of the function have been switched to passing `options`, and there's a `TODO` in place so that we remember to remove the backwards compatibility in v8.

Note that this change doesn't affect anyone using a tunnel, as no auth headers are sent in that case, in order to better cloak store requests from ad blockers.

_\*The "headers" are actually querystring values, so as not to trigger CORS issues, but the effect is the same_

Fixes #5406

packages/browser/src/client.ts

@@ -161,7 +161,7 @@ export class BrowserClient extends BaseClient<BrowserClientOptions> {
 
     __DEBUG_BUILD__ && logger.log('Sending outcomes:', outcomes);
 
-    const url = getEnvelopeEndpointWithUrlEncodedAuth(this._dsn, this._options.tunnel);
+    const url = getEnvelopeEndpointWithUrlEncodedAuth(this._dsn, this._options);
     const envelope = createClientReportEnvelope(outcomes, this._options.tunnel && dsnToString(this._dsn));
 
     try {

packages/core/src/api.ts

@@ -1,4 +1,4 @@
-import { DsnComponents, DsnLike } from '@sentry/types';
+import { ClientOptions, DsnComponents, DsnLike, SdkInfo } from '@sentry/types';
 import { dsnToString, makeDsn, urlEncode } from '@sentry/utils';
 
 const SENTRY_API_VERSION = '7';
@@ -16,12 +16,13 @@ function _getIngestEndpoint(dsn: DsnComponents): string {
 }
 
 /** Returns a URL-encoded string with auth config suitable for a query string. */
-function _encodedAuth(dsn: DsnComponents): string {
+function _encodedAuth(dsn: DsnComponents, sdkInfo: SdkInfo | undefined): string {
   return urlEncode({
     // We send only the minimum set of required information. See
     // https://github.com/getsentry/sentry-javascript/issues/2572.
     sentry_key: dsn.publicKey,
     sentry_version: SENTRY_API_VERSION,
+    ...(sdkInfo && { sentry_client: `${sdkInfo.name}/${sdkInfo.version}` }),
   });
 }
 
@@ -30,8 +31,21 @@ function _encodedAuth(dsn: DsnComponents): string {
  *
  * Sending auth as part of the query string and not as custom HTTP headers avoids CORS preflight requests.
  */
-export function getEnvelopeEndpointWithUrlEncodedAuth(dsn: DsnComponents, tunnel?: string): string {
-  return tunnel ? tunnel : `${_getIngestEndpoint(dsn)}?${_encodedAuth(dsn)}`;
+export function getEnvelopeEndpointWithUrlEncodedAuth(
+  dsn: DsnComponents,
+  // TODO (v8): Remove `tunnelOrOptions` in favor of `options`, and use the substitute code below
+  // options: ClientOptions = {} as ClientOptions,
+  tunnelOrOptions: string | ClientOptions = {} as ClientOptions,
+): string {
+  // TODO (v8): Use this code instead
+  // const { tunnel, _metadata = {} } = options;
+  // return tunnel ? tunnel : `${_getIngestEndpoint(dsn)}?${_encodedAuth(dsn, _metadata.sdk)}`;
+
+  const tunnel = typeof tunnelOrOptions === 'string' ? tunnelOrOptions : tunnelOrOptions.tunnel;
+  const sdkInfo =
+    typeof tunnelOrOptions === 'string' || !tunnelOrOptions._metadata ? undefined : tunnelOrOptions._metadata.sdk;
+
+  return tunnel ? tunnel : `${_getIngestEndpoint(dsn)}?${_encodedAuth(dsn, sdkInfo)}`;
 }
 
 /** Returns the url to the report dialog endpoint. */

packages/core/src/baseclient.ts

@@ -104,7 +104,7 @@ export abstract class BaseClient<O extends ClientOptions> implements Client<O> {
     this._options = options;
     if (options.dsn) {
       this._dsn = makeDsn(options.dsn);
-      const url = getEnvelopeEndpointWithUrlEncodedAuth(this._dsn, options.tunnel);
+      const url = getEnvelopeEndpointWithUrlEncodedAuth(this._dsn, options);
       this._transport = options.transport({
         recordDroppedEvent: this.recordDroppedEvent.bind(this),
         ...options.transportOptions,

packages/core/test/lib/api.test.ts

@@ -1,20 +1,55 @@
 /* eslint-disable deprecation/deprecation */
+import { ClientOptions, DsnComponents } from '@sentry/types';
 import { makeDsn } from '@sentry/utils';
 
 import { getEnvelopeEndpointWithUrlEncodedAuth, getReportDialogEndpoint } from '../../src/api';
 
 const ingestDsn = 'https://abc@xxxx.ingest.sentry.io:1234/subpath/123';
 const dsnPublic = 'https://abc@sentry.io:1234/subpath/123';
 const tunnel = 'https://hello.com/world';
+const _metadata = { sdk: { name: 'sentry.javascript.browser', version: '12.31.12' } } as ClientOptions['_metadata'];
 
 const dsnPublicComponents = makeDsn(dsnPublic);
 
 describe('API', () => {
-  test('getEnvelopeEndpoint', () => {
-    expect(getEnvelopeEndpointWithUrlEncodedAuth(dsnPublicComponents)).toEqual(
-      'https://sentry.io:1234/subpath/api/123/envelope/?sentry_key=abc&sentry_version=7',
+  describe('getEnvelopeEndpointWithUrlEncodedAuth', () => {
+    it.each([
+      [
+        "doesn't include `sentry_client` when called with only DSN",
+        dsnPublicComponents,
+        undefined,
+        'https://sentry.io:1234/subpath/api/123/envelope/?sentry_key=abc&sentry_version=7',
+      ],
+      ['uses `tunnel` value when called with `tunnel` as string', dsnPublicComponents, tunnel, tunnel],
+      [
+        'uses `tunnel` value when called with `tunnel` in options',
+        dsnPublicComponents,
+        { tunnel } as ClientOptions,
+        tunnel,
+      ],
+      [
+        'uses `tunnel` value when called with `tunnel` and `_metadata` in options',
+        dsnPublicComponents,
+        { tunnel, _metadata } as ClientOptions,
+        tunnel,
+      ],
+      [
+        'includes `sentry_client` when called with `_metadata` in options and no tunnel',
+        dsnPublicComponents,
+        { _metadata } as ClientOptions,
+        'https://sentry.io:1234/subpath/api/123/envelope/?sentry_key=abc&sentry_version=7&sentry_client=sentry.javascript.browser%2F12.31.12',
+      ],
+    ])(
+      '%s',
+      (
+        _testName: string,
+        dsnComponents: DsnComponents,
+        tunnelOrOptions: string | ClientOptions | undefined,
+        expected: string,
+      ) => {
+        expect(getEnvelopeEndpointWithUrlEncodedAuth(dsnComponents, tunnelOrOptions)).toBe(expected);
+      },
     );
-    expect(getEnvelopeEndpointWithUrlEncodedAuth(dsnPublicComponents, tunnel)).toEqual(tunnel);
   });
 
   describe('getReportDialogEndpoint', () => {