feat(api): Add preview endpoint

apps/api/package.json

@@ -50,12 +50,14 @@
     "@sendgrid/mail": "^8.1.0",
     "@sentry/browser": "^8.33.1",
     "@sentry/hub": "^7.114.0",
-    "@sentry/node": "^8.33.1",
     "@sentry/nestjs": "^8.33.1",
+    "@sentry/node": "^8.33.1",
     "@sentry/profiling-node": "^8.33.1",
     "@sentry/tracing": "^7.40.0",
     "@types/newrelic": "^9.14.0",
     "@upstash/ratelimit": "^0.4.4",
+    "zod-to-json-schema": "^3.23.3",
+    "@maily-to/render": "^0.0.12",
     "axios": "^1.6.8",
     "bcrypt": "^5.0.0",
     "body-parser": "^1.20.0",
@@ -91,7 +93,8 @@
     "shortid": "^2.2.16",
     "slugify": "^1.4.6",
     "swagger-ui-express": "^4.4.0",
-    "twilio": "^4.14.1",    
+    "twilio": "^4.14.1",
+    "zod": "^3.23.8",
     "json-schema-to-ts": "^3.0.0",
     "uuid": "^8.3.2"
   },
@@ -105,6 +108,7 @@
     "@types/bull": "^3.15.8",
     "@types/chai": "^4.2.11",
     "@types/express": "4.17.17",
+    "@types/faker": "^6.6.9",
     "@types/mocha": "^10.0.2",
     "@types/node": "^20.15.0",
     "@types/passport-github": "^1.1.5",

apps/api/src/.env.test

@@ -114,3 +114,4 @@ CLERK_PRIVATE_KEY=
 CLERK_PEM_PUBLIC_KEY=
 
 TUNNEL_BASE_ADDRESS=example.com
+API_ROOT_URL=http://localhost:1337

apps/api/src/app/bridge/bridge.controller.ts

@@ -14,7 +14,7 @@ import {
   UseInterceptors,
 } from '@nestjs/common';
 
-import { ControlValuesLevelEnum, UserSessionData, WorkflowTypeEnum } from '@novu/shared';
+import { ControlValuesLevelEnum, UserSessionData, WorkflowOriginEnum, WorkflowTypeEnum } from '@novu/shared';
 import { AnalyticsService, ExternalApiAccessible, UserAuthGuard, UserSession } from '@novu/application-generic';
 import { ControlValuesRepository, EnvironmentRepository, NotificationTemplateRepository } from '@novu/dal';
 
@@ -75,6 +75,7 @@ export class BridgeController {
         environmentId: user.environmentId,
         organizationId: user.organizationId,
         userId: user._id,
+        workflowOrigin: WorkflowOriginEnum.EXTERNAL,
       })
     );
   }

apps/api/src/app/bridge/usecases/preview-step/preview-step.command.ts

@@ -1,8 +1,12 @@
 import { EnvironmentWithUserCommand } from '@novu/application-generic';
+import { Subscriber } from '@novu/framework';
+import { WorkflowOriginEnum } from '@novu/shared';
 
 export class PreviewStepCommand extends EnvironmentWithUserCommand {
   workflowId: string;
   stepId: string;
   controls: Record<string, unknown>;
   payload: Record<string, unknown>;
+  subscriber?: Subscriber;
+  workflowOrigin: WorkflowOriginEnum;
 }

apps/api/src/app/bridge/usecases/preview-step/preview-step.usecase.ts

@@ -1,7 +1,6 @@
 import { Injectable } from '@nestjs/common';
-import { PostActionEnum, HttpQueryKeysEnum, Event, JobStatusEnum, ExecuteOutput } from '@novu/framework';
+import { Event, ExecuteOutput, HttpQueryKeysEnum, JobStatusEnum, PostActionEnum } from '@novu/framework';
 import { ExecuteBridgeRequest, ExecuteBridgeRequestCommand } from '@novu/application-generic';
-import { WorkflowOriginEnum } from '@novu/shared';
 
 import { PreviewStepCommand } from './preview-step.command';
 
@@ -10,44 +9,46 @@ export class PreviewStep {
   constructor(private executeBridgeRequest: ExecuteBridgeRequest) {}
 
   async execute(command: PreviewStepCommand): Promise<ExecuteOutput> {
-    const event = this.mapEvent(command);
-
-    const response = (await this.executeBridgeRequest.execute(
-      ExecuteBridgeRequestCommand.create({
-        environmentId: command.environmentId,
-        action: PostActionEnum.PREVIEW,
-        event,
-        searchParams: {
-          [HttpQueryKeysEnum.WORKFLOW_ID]: command.workflowId,
-          [HttpQueryKeysEnum.STEP_ID]: command.stepId,
-        },
-        // TODO: pass the origin from the command
-        workflowOrigin: WorkflowOriginEnum.EXTERNAL,
-        retriesLimit: 1,
-      })
-    )) as ExecuteOutput;
+    const event = this.buildBridgeEventPayload(command);
+    const executeCommand = this.createExecuteCommand(command, event);
+
+    const bridgeResult = await this.executeBridgeRequest.execute(executeCommand);
+
+    return bridgeResult as ExecuteOutput;
+  }
 
-    return response;
+  private createExecuteCommand(command: PreviewStepCommand, event: Event) {
+    return ExecuteBridgeRequestCommand.create({
+      environmentId: command.environmentId,
+      action: PostActionEnum.PREVIEW,
+      event,
+      searchParams: {
+        [HttpQueryKeysEnum.WORKFLOW_ID]: command.workflowId,
+        [HttpQueryKeysEnum.STEP_ID]: command.stepId,
+      },
+      workflowOrigin: command.workflowOrigin,
+      retriesLimit: 1,
+    });
   }
 
-  private mapEvent(command: PreviewStepCommand): Omit<Event, 'workflowId' | 'stepId' | 'action' | 'source'> {
-    const payload = {
-      /** @deprecated - use controls instead */
-      inputs: command.controls || {},
+  private buildBridgeEventPayload(command: PreviewStepCommand): Event {
+    return {
+      inputs: {}, // @deprecated - use controls instead
       controls: command.controls || {},
-      /** @deprecated - use payload instead */
-      data: command.payload || {},
+
+      data: {}, // @deprecated - use payload instead
       payload: command.payload || {},
       state: [
         {
           stepId: 'trigger',
-          outputs: command.payload || {},
+          outputs: {},
           state: { status: JobStatusEnum.COMPLETED },
         },
       ],
-      subscriber: {},
+      subscriber: command.subscriber || {},
+      stepId: command.stepId,
+      workflowId: command.workflowId,
+      action: PostActionEnum.PREVIEW,
     };
-
-    return payload;
   }
 }

apps/api/src/app/environments-v1/novu-bridge-client.ts

@@ -1,7 +1,6 @@
-import { Injectable, Inject, Scope } from '@nestjs/common';
+import { Inject, Injectable, Scope } from '@nestjs/common';
 import type { Request, Response } from 'express';
-
-import { Client, PostActionEnum, NovuRequestHandler, Workflow } from '@novu/framework';
+import { Client, NovuRequestHandler, PostActionEnum, Workflow } from '@novu/framework';
 // @ts-expect-error - TODO: bundle CJS with @novu/framework
 import { NovuHandler } from '@novu/framework/nest';
 import { GetDecryptedSecretKey, GetDecryptedSecretKeyCommand } from '@novu/application-generic';
@@ -46,12 +45,12 @@ export class NovuBridgeClient {
         ConstructFrameworkWorkflowCommand.create({
           environmentId: req.params.environmentId,
           workflowId: req.query.workflowId as string,
+          controlValues: req.body.controls,
         })
       );
 
       workflows.push(programmaticallyConstructedWorkflow);
     }
-
     this.novuRequestHandler = new NovuRequestHandler({
       frameworkName,
       workflows,

apps/api/src/app/environments-v1/novu-bridge.module.ts

@@ -7,6 +7,14 @@ import { GetDecryptedSecretKey } from '@novu/application-generic';
 import { NovuBridgeClient } from './novu-bridge-client';
 import { ConstructFrameworkWorkflow } from './usecases/construct-framework-workflow';
 import { NovuBridgeController } from './novu-bridge.controller';
+import {
+  ChatOutputRendererUsecase,
+  EmailOutputRendererUsecase,
+  ExpandEmailEditorSchemaUsecase,
+  InAppOutputRendererUsecase,
+  PushOutputRendererUsecase,
+  SmsOutputRendererUsecase,
+} from './usecases/output-renderers';
 
 @Module({
   controllers: [NovuBridgeController],
@@ -20,6 +28,13 @@ import { NovuBridgeController } from './novu-bridge.controller';
     NotificationTemplateRepository,
     ConstructFrameworkWorkflow,
     GetDecryptedSecretKey,
+    InAppOutputRendererUsecase,
+    EmailOutputRendererUsecase,
+    SmsOutputRendererUsecase,
+    ChatOutputRendererUsecase,
+    PushOutputRendererUsecase,
+    EmailOutputRendererUsecase,
+    ExpandEmailEditorSchemaUsecase,
   ],
 })
 export class NovuBridgeModule {}

apps/api/src/app/environments-v1/usecases/construct-framework-workflow/construct-framework-workflow.command.ts

@@ -5,4 +5,8 @@ export class ConstructFrameworkWorkflowCommand extends EnvironmentLevelCommand {
   @IsString()
   @IsDefined()
   workflowId: string;
+
+  @IsObject()
+  @IsDefined()
+  controlValues: Record<string, unknown>;
 }

apps/api/src/app/environments-v1/usecases/construct-framework-workflow/construct-framework-workflow.usecase.ts

@@ -2,41 +2,45 @@ import { Injectable, InternalServerErrorException } from '@nestjs/common';
 import {
   ActionStep,
   ChannelStep,
-  ChatOutput,
   DelayOutput,
   DigestOutput,
-  EmailOutput,
-  InAppOutput,
-  PushOutput,
-  SmsOutput,
   Step,
   StepOptions,
   StepOutput,
   Workflow,
   workflow,
 } from '@novu/framework';
-import { NotificationTemplateRepository, NotificationTemplateEntity, NotificationStepEntity } from '@novu/dal';
+import { NotificationStepEntity, NotificationTemplateEntity, NotificationTemplateRepository } from '@novu/dal';
 import { StepTypeEnum } from '@novu/shared';
 import { ConstructFrameworkWorkflowCommand } from './construct-framework-workflow.command';
+import {
+  ChatOutputRendererUsecase,
+  EmailOutputRendererUsecase,
+  InAppOutputRendererUsecase,
+  PushOutputRendererUsecase,
+  SmsOutputRendererUsecase,
+} from '../output-renderers';
 
 @Injectable()
 export class ConstructFrameworkWorkflow {
-  constructor(private workflowsRepository: NotificationTemplateRepository) {}
+  constructor(
+    private workflowsRepository: NotificationTemplateRepository,
+    private inAppOutputRendererUseCase: InAppOutputRendererUsecase,
+    private emailOutputRendererUseCase: EmailOutputRendererUsecase,
+    private smsOutputRendererUseCase: SmsOutputRendererUsecase,
+    private chatOutputRendererUseCase: ChatOutputRendererUsecase,
+    private pushOutputRendererUseCase: PushOutputRendererUsecase
+  ) {}
 
   async execute(command: ConstructFrameworkWorkflowCommand): Promise<Workflow> {
     const dbWorkflow = await this.getDbWorkflow(command.environmentId, command.workflowId);
-
-    return this.constructFrameworkWorkflow(dbWorkflow);
-  }
-
-  private async getDbWorkflow(environmentId: string, workflowId: string): Promise<NotificationTemplateEntity> {
-    const foundWorkflow = await this.workflowsRepository.findByTriggerIdentifier(environmentId, workflowId);
-
-    if (!foundWorkflow) {
-      throw new InternalServerErrorException(`Workflow ${workflowId} not found`);
+    if (command.controlValues) {
+      for (const step of dbWorkflow.steps) {
+        step.controlVariables = command.controlValues;
+      }
     }
 
-    return foundWorkflow;
+    return this.constructFrameworkWorkflow(dbWorkflow);
   }
 
   private constructFrameworkWorkflow(newWorkflow: NotificationTemplateEntity): Workflow {
@@ -48,6 +52,8 @@ export class ConstructFrameworkWorkflow {
         }
       },
       {
+        payloadSchema: PERMISSIVE_EMPTY_SCHEMA,
+
         /*
          * TODO: Workflow options are not needed currently, given that this endpoint
          * focuses on execution only. However we should reconsider if we decide to
@@ -69,11 +75,9 @@ export class ConstructFrameworkWorkflow {
 
     const stepType = stepTemplate.type;
     const { stepId } = staticStep;
-
     if (!stepId) {
       throw new InternalServerErrorException(`Step id not found for step ${staticStep.stepId}`);
     }
-
     const stepControls = stepTemplate.controls;
 
     if (!stepControls) {
@@ -87,8 +91,7 @@ export class ConstructFrameworkWorkflow {
           stepId,
           // The step callback function. Takes controls and returns the step outputs
           async (controlValues) => {
-            // TODO: insert custom in-app hydration logic here.
-            return controlValues as InAppOutput;
+            return this.inAppOutputRendererUseCase.execute({ controlValues });
           },
           // Step options
           this.constructChannelStepOptions(staticStep)
@@ -97,35 +100,31 @@ export class ConstructFrameworkWorkflow {
         return step.email(
           stepId,
           async (controlValues) => {
-            // TODO: insert custom Maily.to hydration logic here.
-            return controlValues as EmailOutput;
+            return this.emailOutputRendererUseCase.execute({ controlValues });
           },
           this.constructChannelStepOptions(staticStep)
         );
       case StepTypeEnum.SMS:
         return step.inApp(
           stepId,
           async (controlValues) => {
-            // TODO: insert custom SMS hydration logic here.
-            return controlValues as SmsOutput;
+            return this.smsOutputRendererUseCase.execute({ controlValues });
           },
           this.constructChannelStepOptions(staticStep)
         );
       case StepTypeEnum.CHAT:
         return step.inApp(
           stepId,
           async (controlValues) => {
-            // TODO: insert custom chat hydration logic here.
-            return controlValues as ChatOutput;
+            return this.chatOutputRendererUseCase.execute({ controlValues });
           },
           this.constructChannelStepOptions(staticStep)
         );
       case StepTypeEnum.PUSH:
         return step.inApp(
           stepId,
           async (controlValues) => {
-            // TODO: insert custom push hydration logic here.
-            return controlValues as PushOutput;
+            return this.pushOutputRendererUseCase.execute({ controlValues });
           },
           this.constructChannelStepOptions(staticStep)
         );
@@ -178,4 +177,19 @@ export class ConstructFrameworkWorkflow {
       skip: (controlValues) => false,
     };
   }
+  private async getDbWorkflow(environmentId: string, workflowId: string): Promise<NotificationTemplateEntity> {
+    const foundWorkflow = await this.workflowsRepository.findByTriggerIdentifier(environmentId, workflowId);
+
+    if (!foundWorkflow) {
+      throw new InternalServerErrorException(`Workflow ${workflowId} not found`);
+    }
+
+    return foundWorkflow;
+  }
 }
+const PERMISSIVE_EMPTY_SCHEMA = {
+  type: 'object',
+  properties: {},
+  required: [],
+  additionalProperties: true,
+} as const;

apps/api/src/app/environments-v1/usecases/output-renderers/chat-output-renderer.usecase.ts

@@ -0,0 +1,13 @@
+// Concrete Renderer for Chat Preview
+import { ChatRenderOutput } from '@novu/shared';
+import { Injectable } from '@nestjs/common';
+import { RenderCommand } from './render-command';
+
+@Injectable()
+export class ChatOutputRendererUsecase {
+  execute(renderCommand: RenderCommand): ChatRenderOutput {
+    const body = renderCommand.controlValues.body as string;
+
+    return { body };
+  }
+}