feat: remove bearer token middleware flag (#6934)

## About the changes
Removes the bearer token middleware flag for GA

src/lib/__snapshots__/create-config.test.ts.snap

@@ -78,7 +78,6 @@ exports[`should create default config 1`] = `
       "anonymiseEventLog": false,
       "applicationOverviewNewQuery": false,
       "automatedActions": false,
-      "bearerTokenMiddleware": false,
       "caseInsensitiveInOperators": false,
       "celebrateUnleash": false,
       "collectTrafficDataUsage": false,

src/lib/middleware/bearer-token-middleware.test.ts

@@ -16,11 +16,6 @@ describe('bearerTokenMiddleware', () => {
     beforeEach(() => {
         config = createTestConfig({
             getLogger,
-            experimental: {
-                flags: {
-                    bearerTokenMiddleware: true,
-                },
-            },
         });
     });
 
@@ -64,14 +59,9 @@ describe('bearerTokenMiddleware', () => {
         expect(req.headers.authorization).toBe(exampleSignalToken);
     });
 
-    it('should always run for signal endpoint, regardless of the flag', () => {
+    it('should always run for signal endpoint, without base path', () => {
         const configWithBearerTokenMiddlewareFlagDisabled = createTestConfig({
             getLogger,
-            experimental: {
-                flags: {
-                    bearerTokenMiddleware: false,
-                },
-            },
         });
 
         const middleware = bearerTokenMiddleware(
@@ -88,17 +78,12 @@ describe('bearerTokenMiddleware', () => {
         expect(req.headers.authorization).toBe(exampleSignalToken);
     });
 
-    it('should always run for signal endpoint, regardless of the flag, supporting instance path', () => {
+    it('should always run for signal endpoint, regardless of the flag, with base path', () => {
         const configWithBearerTokenMiddlewareFlagDisabled = createTestConfig({
             getLogger,
             server: {
                 baseUriPath: '/some-test-instance',
             },
-            experimental: {
-                flags: {
-                    bearerTokenMiddleware: false,
-                },
-            },
         });
 
         const middleware = bearerTokenMiddleware(

src/lib/middleware/bearer-token-middleware.ts

@@ -2,27 +2,15 @@ import type { Request, Response, NextFunction } from 'express';
 import type { IUnleashConfig } from '../types';
 
 export const bearerTokenMiddleware = ({
-    server,
     getLogger,
-    flagResolver,
+}: Pick<IUnleashConfig, 'getLogger'>) => {
-}: Pick<IUnleashConfig, 'server' | 'getLogger' | 'flagResolver'>) => {
     const logger = getLogger('/middleware/bearer-token-middleware.ts');
     logger.debug('Enabling bearer token middleware');
-    const baseUriPath = server.baseUriPath || '';
-
     return (req: Request, _: Response, next: NextFunction) => {
-        if (
-            req.path.startsWith(`${baseUriPath}/api/signal-endpoint/`) ||
-            flagResolver.isEnabled('bearerTokenMiddleware')
-        ) {
         const authHeader = req.headers.authorization;
 
         if (authHeader) {
-                req.headers.authorization = authHeader.replace(
+            req.headers.authorization = authHeader.replace(/^Bearer\s+/i, '');
-                    /^Bearer\s+/i,
-                    '',
-                );
-            }
         }
         next();
     };

src/lib/types/experimental.ts

@@ -53,7 +53,6 @@ export type IFlagKey =
     | 'displayEdgeBanner'
     | 'projectOverviewRefactor'
     | 'disableShowContextFieldSelectionValues'
-    | 'bearerTokenMiddleware'
     | 'projectOverviewRefactorFeedback'
     | 'featureLifecycle'
     | 'projectListFilterMyProjects'
@@ -261,10 +260,6 @@ const flags: IFlags = {
             .UNLEASH_EXPERIMENTAL_DISABLE_SHOW_CONTEXT_FIELD_SELECTION_VALUES,
         false,
     ),
-    bearerTokenMiddleware: parseEnvVarBoolean(
-        process.env.UNLEASH_EXPERIMENTAL_BEARER_TOKEN_MIDDLEWARE,
-        false,
-    ),
     projectOverviewRefactorFeedback: parseEnvVarBoolean(
         process.env.UNLEASH_EXPERIMENTAL_PROJECT_OVERVIEW_REFACTOR_FEEDBACK,
         false,