| 1 | import { |
| 2 | applyDecorators, |
| 3 | Body, |
| 4 | CanActivate, |
| 5 | Controller, |
| 6 | Get, |
| 7 | Inject, |
| 8 | Logger, |
| 9 | OnModuleInit, |
| 10 | Post, |
| 11 | Req, |
| 12 | Res, |
| 13 | Type, |
| 14 | UseGuards, |
| 15 | VERSION_NEUTRAL, |
| 16 | } from '@nestjs/common' |
| 17 | |
| 18 | import { McpOptions } from '../interfaces' |
| 19 | import { McpSseService } from '../services/mcp-sse.service' |
| 20 | import { normalizeEndpoint } from '../utils/normalize-endpoint' |
| 21 | |
| 22 | /** |
| 23 | * Creates a controller for handling SSE connections and tool executions |
| 24 | */ |
| 25 | export function createSseController( |
| 26 | sseEndpoint: string, |
| 27 | messagesEndpoint: string, |
| 28 | apiPrefix: string, |
| 29 | guards: Type<CanActivate>[] = [], |
| 30 | decorators: ClassDecorator[] = [], |
| 31 | ) { |
| 32 | @Controller({ |
| 33 | version: VERSION_NEUTRAL, |
| 34 | }) |
| 35 | @applyDecorators(...decorators) |
| 36 | class SseController implements OnModuleInit { |
| 37 | readonly logger = new Logger(SseController.name) |
| 38 | |
| 39 | constructor( |
| 40 | @Inject('MCP_OPTIONS') public readonly options: McpOptions, |
| 41 | public readonly mcpSseService: McpSseService, |
| 42 | ) {} |
| 43 | |
| 44 | /** |
| 45 | * Initialize the controller and configure SSE service |
| 46 | */ |
| 47 | onModuleInit() { |
| 48 | this.mcpSseService.initialize() |
| 49 | } |
| 50 | |
| 51 | /** |
| 52 | * SSE connection endpoint |
| 53 | */ |
| 54 | @Get(normalizeEndpoint(`${apiPrefix}/${sseEndpoint}`)) |
| 55 | @UseGuards(...guards) |
| 56 | async sse(@Req() rawReq: any, @Res() rawRes: any) { |
| 57 | return this.mcpSseService.createSseConnection( |
| 58 | rawReq, |
| 59 | rawRes, |
| 60 | messagesEndpoint, |
| 61 | apiPrefix, |
| 62 | ) |
| 63 | } |
| 64 | |
| 65 | /** |
| 66 | * Tool execution endpoint - protected by the provided guards |
| 67 | */ |
| 68 | @Post(normalizeEndpoint(`${apiPrefix}/${messagesEndpoint}`)) |
| 69 | @UseGuards(...guards) |
| 70 | async messages( |
| 71 | @Req() rawReq: any, |
| 72 | @Res() rawRes: any, |
| 73 | @Body() body: unknown, |
| 74 | ): Promise<void> { |
| 75 | await this.mcpSseService.handleMessage(rawReq, rawRes, body) |
| 76 | } |
| 77 | } |
| 78 | |
| 79 | return SseController |
| 80 | } |
| 81 |