feat(api): internal agent config endpoint (MS22-P1c) (#609)

Co-authored-by: Jason Woltje <jason@diversecanvas.com>
Co-committed-by: Jason Woltje <jason@diversecanvas.com>

apps/api/src/agent-config/agent-config.guard.ts

@@ -0,0 +1,43 @@
+import { CanActivate, ExecutionContext, Injectable, UnauthorizedException } from "@nestjs/common";
+import type { Request } from "express";
+import { AgentConfigService, type ContainerTokenValidation } from "./agent-config.service";
+
+export interface AgentConfigRequest extends Request {
+  containerAuth?: ContainerTokenValidation;
+}
+
+@Injectable()
+export class AgentConfigGuard implements CanActivate {
+  constructor(private readonly agentConfigService: AgentConfigService) {}
+
+  async canActivate(context: ExecutionContext): Promise<boolean> {
+    const request = context.switchToHttp().getRequest<AgentConfigRequest>();
+    const token = this.extractBearerToken(request.headers.authorization);
+
+    if (!token) {
+      throw new UnauthorizedException("Missing Bearer token");
+    }
+
+    const containerAuth = await this.agentConfigService.validateContainerToken(token);
+    if (!containerAuth) {
+      throw new UnauthorizedException("Invalid container token");
+    }
+
+    request.containerAuth = containerAuth;
+    return true;
+  }
+
+  private extractBearerToken(headerValue: string | string[] | undefined): string | null {
+    const normalizedHeader = Array.isArray(headerValue) ? headerValue[0] : headerValue;
+    if (!normalizedHeader) {
+      return null;
+    }
+
+    const [scheme, token] = normalizedHeader.split(" ");
+    if (!scheme || !token || scheme.toLowerCase() !== "bearer") {
+      return null;
+    }
+
+    return token;
+  }
+}