js-sdk/packages/nest/test/test-app.ts

import { Controller, ForbiddenException, Get, Injectable, UseInterceptors } from '@nestjs/common';
import type { Observable } from 'rxjs';
import { map } from 'rxjs';
import {
  BooleanFeatureFlag,
  ObjectFeatureFlag,
  NumberFeatureFlag,
  OpenFeatureClient,
  StringFeatureFlag,
  RequireFlagsEnabled,
} from '../src';
import type { Client, EvaluationDetails, FlagValue } from '@openfeature/server-sdk';
import { EvaluationContextInterceptor } from '../src';

@Injectable()
export class OpenFeatureTestService {
  constructor(
    @OpenFeatureClient() public defaultClient: Client,
    @OpenFeatureClient({ domain: 'domainScopedClient' }) public domainScopedClient: Client,
  ) {}

  public async serviceMethod(flag: EvaluationDetails<FlagValue>) {
    return flag.value;
  }

  public async serviceMethodWithDynamicContext(flagKey: string): Promise<boolean> {
    return this.defaultClient.getBooleanValue(flagKey, false);
  }
}

@Controller()
export class OpenFeatureController {
  constructor(private testService: OpenFeatureTestService) {}

  @Get('/welcome')
  public async welcome(
    @BooleanFeatureFlag({ flagKey: 'testBooleanFlag', defaultValue: false })
    feature: Observable<EvaluationDetails<boolean>>,
  ) {
    return feature.pipe(
      map((details) =>
        details.value ? 'Welcome to this OpenFeature-enabled Nest.js app!' : 'Welcome to this Nest.js app!',
      ),
    );
  }

  @Get('/boolean')
  public async handleBooleanRequest(
    @BooleanFeatureFlag({ flagKey: 'testBooleanFlag', defaultValue: false })
    feature: Observable<EvaluationDetails<boolean>>,
  ) {
    return feature.pipe(map((details) => this.testService.serviceMethod(details)));
  }

  @Get('/string')
  public async handleStringRequest(
    @StringFeatureFlag({ flagKey: 'testStringFlag', defaultValue: 'default-value' })
    feature: Observable<EvaluationDetails<string>>,
  ) {
    return feature.pipe(map((details) => this.testService.serviceMethod(details)));
  }

  @Get('/number')
  public async handleNumberRequest(
    @NumberFeatureFlag({ flagKey: 'testNumberFlag', defaultValue: 0 })
    feature: Observable<EvaluationDetails<number>>,
  ) {
    return feature.pipe(map((details) => this.testService.serviceMethod(details)));
  }

  @Get('/object')
  public async handleObjectRequest(
    @ObjectFeatureFlag({ flagKey: 'testObjectFlag', defaultValue: {} })
    feature: Observable<EvaluationDetails<number>>,
  ) {
    return feature.pipe(map((details) => this.testService.serviceMethod(details)));
  }

  @Get('/dynamic-context')
  public async handleDynamicContextRequest(
    @BooleanFeatureFlag({
      flagKey: 'testBooleanFlag',
      defaultValue: false,
    })
    feature: Observable<EvaluationDetails<number>>,
  ) {
    return feature.pipe(map((details) => this.testService.serviceMethod(details)));
  }

  @Get('/dynamic-context-in-service')
  public async handleDynamicContextInServiceRequest() {
    return this.testService.serviceMethodWithDynamicContext('testBooleanFlag');
  }

  @RequireFlagsEnabled({
    flags: [{ flagKey: 'testBooleanFlag' }],
  })
  @Get('/flags-enabled')
  public async handleGuardedBooleanRequest() {
    return 'Get Boolean Flag Success!';
  }

  @RequireFlagsEnabled({
    flags: [{ flagKey: 'testBooleanFlag' }],
    exception: new ForbiddenException(),
  })
  @Get('/flags-enabled-custom-exception')
  public async handleBooleanRequestWithCustomException() {
    return 'Get Boolean Flag Success!';
  }

  @RequireFlagsEnabled({
    flags: [{ flagKey: 'testBooleanFlag2' }],
    exception: new ForbiddenException(),
    context: {
      targetingKey: 'user-id',
    },
  })
  @Get('/flags-enabled-custom-exception-with-context')
  public async handleBooleanRequestWithCustomExceptionAndContext() {
    return 'Get Boolean Flag Success!';
  }
}

@Controller()
@UseInterceptors(EvaluationContextInterceptor)
export class OpenFeatureContextScopedController {
  constructor(private testService: OpenFeatureTestService) {}

  @Get('/controller-context')
  public async handleDynamicContextRequest(
    @BooleanFeatureFlag({
      flagKey: 'testBooleanFlag',
      defaultValue: false,
    })
    feature: Observable<EvaluationDetails<number>>,
  ) {
    return feature.pipe(map((details) => this.testService.serviceMethod(details)));
  }

  @RequireFlagsEnabled({
    flags: [{ flagKey: 'testBooleanFlag' }],
    domain: 'domainScopedClient',
  })
  @Get('/controller-context/flags-enabled')
  public async handleBooleanRequest() {
    return 'Get Boolean Flag Success!';
  }
}

@Controller('require-flags-enabled')
@RequireFlagsEnabled({
  flags: [{ flagKey: 'testBooleanFlag', defaultValue: false }, { flagKey: 'testBooleanFlag2' }],
  exception: new ForbiddenException(),
})
export class OpenFeatureRequireFlagsEnabledController {
  constructor() {}

  @Get('/')
  public async handleGetRequest() {
    return 'Hello, world!';
  }
}