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feature-handler-service.ts
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feature-handler-service.ts
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import {Getter, extensionPoint, extensions} from '@loopback/core';
import {
FeatureFlagMetadata,
FeatureHandler,
HANDLER_EXTENSION_POINT_NAME,
IAuthUserWithDisabledFeat,
} from '../types';
import {HttpErrors} from '@loopback/rest';
@extensionPoint(HANDLER_EXTENSION_POINT_NAME)
export class FeatureHandlerService {
constructor(
@extensions()
private getHandlers: Getter<FeatureHandler[]>,
) {}
async findHandler(handlerName: string): Promise<FeatureHandler | undefined> {
const handlers = await this.getHandlers();
return handlers.find(h => h.handlerName === handlerName);
}
async handle(
featureMetadata: FeatureFlagMetadata,
currentUser: IAuthUserWithDisabledFeat,
): Promise<boolean> {
if (featureMetadata.options?.handler) {
const handler = await this.findHandler(featureMetadata.options?.handler);
if (handler) {
return handler.handle(featureMetadata, currentUser);
} else {
throw new HttpErrors.InternalServerError('No Handler Found');
}
} else {
return true;
}
}
}