helix-engage-server/src/graphql-proxy/graphql-proxy.controller.ts

import { Controller, Post, Req, Res, Logger, HttpException } from '@nestjs/common';
import { ConfigService } from '@nestjs/config';
import type { Request, Response } from 'express';
import axios from 'axios';

@Controller('graphql')
export class GraphqlProxyController {
    private readonly logger = new Logger(GraphqlProxyController.name);
    private readonly graphqlUrl: string;

    constructor(private config: ConfigService) {
        this.graphqlUrl = config.get<string>('platform.graphqlUrl')!;
    }

    @Post()
    async proxy(@Req() req: Request, @Res() res: Response) {
        const authHeader = req.headers.authorization;

        if (!authHeader) {
            throw new HttpException('Authorization header required', 401);
        }

        try {
            const response = await axios.post(
                this.graphqlUrl,
                req.body,
                {
                    headers: {
                        'Content-Type': 'application/json',
                        'Authorization': authHeader,
                    },
                },
            );

            res.status(response.status).json(response.data);
        } catch (error: any) {
            if (error.response) {
                res.status(error.response.status).json(error.response.data);
            } else {
                this.logger.error(`GraphQL proxy error: ${error.message}`);
                throw new HttpException('Platform unreachable', 503);
            }
        }
    }
}