unleash-server/dist/lib/middleware/origin-middleware.js

Unleash is an enterprise ready feature flag service. It provides different strategies for handling feature flags.

import { REQUEST_ORIGIN, emitMetricEvent } from '../metric-events.js';
import { determineIntegrationSource, getFilteredOrigin, } from './integration-headers.js';
export const originMiddleware = ({ getLogger, eventBus, flagResolver, }) => {
    const logger = getLogger('/middleware/origin-middleware.ts');
    logger.debug('Enabling origin middleware');
    return (req, _, next) => {
        const isUI = !req.headers.authorization;
        if (isUI) {
            emitMetricEvent(eventBus, REQUEST_ORIGIN, {
                type: 'UI',
                method: req.method,
            });
        }
        else {
            const userAgent = req.headers['user-agent'];
            const uaLabel = userAgent
                ? determineIntegrationSource(userAgent)
                : 'Other';
            if (flagResolver.isEnabled('originMiddlewareRequestLogging')) {
                logger.info('API request', {
                    method: req.method,
                    userAgent: req.headers['user-agent'],
                    origin: getFilteredOrigin(req),
                });
            }
            emitMetricEvent(eventBus, REQUEST_ORIGIN, {
                type: 'API',
                method: req.method,
                source: uaLabel,
            });
        }
        next();
    };
};
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