fix(web): auth gate Ask APIs for Public SaaS

CHANGELOG.md

@@ -12,6 +12,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ### Fixed
 - Removed suggested example queries from the Ask landing page. [#1674](https://github.com/sourcebot-dev/sourcebot/pull/1674)
+- Require authentication for the streaming and blocking Ask APIs in Public SaaS deployments. [#1679](https://github.com/sourcebot-dev/sourcebot/pull/1679)
 
 ## [5.1.14] - 2026-09-17
 

packages/web/src/app/api/(server)/ee/chat/route.ts

@@ -15,7 +15,7 @@ import { getAskSkillAvailabilityAnalytics, getAskSkillTurnCompletedAnalytics } f
 import { apiHandler } from "@/lib/apiHandler";
 import { ErrorCode } from "@/lib/errorCodes";
 import { captureEvent } from "@/lib/posthog";
-import { notFound, requestBodySchemaValidationError, ServiceError, serviceErrorResponse } from "@/lib/serviceError";
+import { notAuthenticated, notFound, requestBodySchemaValidationError, ServiceError, serviceErrorResponse } from "@/lib/serviceError";
 import { isServiceError } from "@/lib/utils";
 import { withOptionalAuth } from "@/middleware/withAuth";
 import * as Sentry from "@sentry/nextjs";
@@ -50,6 +50,10 @@ export const POST = apiHandler(async (req: NextRequest) => {
 
     const response = await sew(() =>
         withOptionalAuth(async ({ org, user, prisma }) => {
+            if (env.EXPERIMENT_ASK_GH_ENABLED === 'true' && !user) {
+                return notAuthenticated();
+            }
+
             // Gate the generative path behind the `ask` entitlement. The client
             // also gates this, but server-side enforcement can't be bypassed.
             const askError = await checkAskEntitlement();

packages/web/src/ee/features/mcp/askCodebase.ts

@@ -7,7 +7,7 @@ import { LanguageModelInfo, SBChatMessage, SearchScope } from "@/features/chat/t
 import { convertLLMOutputToPortableMarkdown, getAnswerPartFromAssistantMessage, getLanguageModelKey } from "@/features/chat/utils";
 import { resolveModelCapabilities } from "@/features/chat/modelCapabilities.server";
 import { ErrorCode } from "@/lib/errorCodes";
-import { ServiceError, ServiceErrorException } from "@/lib/serviceError";
+import { notAuthenticated, ServiceError, ServiceErrorException } from "@/lib/serviceError";
 import { withOptionalAuth } from "@/middleware/withAuth";
 import { ChatVisibility, Prisma } from "@sourcebot/db";
 import { createLogger, env } from "@sourcebot/shared";
@@ -49,6 +49,10 @@ const blockStreamUntilFinish = async <T extends UIMessage<unknown, UIDataTypes,
 export const askCodebase = (params: AskCodebaseParams): Promise<AskCodebaseResult | ServiceError> =>
     sew(() =>
         withOptionalAuth(async ({ org, user, prisma }) => {
+            if (env.EXPERIMENT_ASK_GH_ENABLED === 'true' && !user) {
+                return notAuthenticated();
+            }
+
             // Ask Sourcebot is a paid feature. askCodebase() is the single choke point
             // for the programmatic ask path (the MCP `ask_codebase` tool and the
             // /api/chat/blocking route both wrap it), so gating here covers both without