Nestjs MasterClass Slides
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The document outlines a masterclass on NestJS by Nir Kaufman, highlighting its modular architecture and key components such as modules, controllers, providers, and guards. It explains how to implement authentication, exception handling, and input validation using various techniques in NestJS. The masterclass encourages exploration of patterns and community contributions to further develop skills in using NestJS.
Nestjs MasterClass Slides
- 1. MasterClass Enter NestJS Nir Kaufman | 2019
- 2. Nir Kaufman @nirkaufman Principal developer & consultant @ 500Tech Google Developer Expert in Web Technologies
- 5. Enter NestJS The framework we where waiting for
- 8. Modules Package of related classes
- 10. Modules Application Module Feature Module Feature Module Feature Module
- 11. Modules Application Module Feature Module Feature Module Feature Module Shared Module
- 14. Controllers Handling requests & responses
- 18. The structure Clear separation of concerns
- 21. Letâs do it the OOP style Object-relational mapping
- 23. Additional API
- 24. ControllerClient Determine whether a given request will be handled by the controller Guards Guard
- 25. @Injectable() export class AuthGuard implements CanActivate { canActivate(context: ExecutionContext): boolean { const token = context.switchToHttp().getRequest().headers.token; return validateToken(token); } } Auth Guard
- 26. @Injectable() export class AuthGuard implements CanActivate { canActivate(context: ExecutionContext): boolean { const token = context.switchToHttp().getRequest().headers.token; return validateToken(token); } } Auth Guard
- 27. @Injectable() export class AuthGuard implements CanActivate { canActivate(context: ExecutionContext): boolean { const token = context.switchToHttp().getRequest().headers.token; return validateToken(token); } } Auth Guard
- 28. ControllerClient  Implements the generic ExceptionFilter<T> interface Exception ïŹlters Guard Filter Filter
- 29. @Catch(ForbiddenException) export class AuthFilter implements ExceptionFilter { catch(exception: ForbiddenException, host: ArgumentsHost) { const ctx = host.switchToHttp(); const response = ctx.getResponse(); const request = ctx.getRequest(); const status = exception.getStatus(); response.status(status).json({ statusCode: status, timestamp: new Date().toISOString(), path: request.url, message: 'Protected method' Auth Filter
- 30. @Catch(ForbiddenException) export class AuthFilter implements ExceptionFilter { catch(exception: ForbiddenException, host: ArgumentsHost) { const ctx = host.switchToHttp(); const response = ctx.getResponse(); const request = ctx.getRequest(); const status = exception.getStatus(); response.status(status).json({ statusCode: status, timestamp: new Date().toISOString(), path: request.url, message: 'Protected method' Auth Filter
- 31. @Catch(ForbiddenException) export class AuthFilter implements ExceptionFilter { catch(exception: ForbiddenException, host: ArgumentsHost) { const ctx = host.switchToHttp(); const response = ctx.getResponse(); const request = ctx.getRequest(); const status = exception.getStatus(); response.status(status).json({ statusCode: status, timestamp: new Date().toISOString(), path: request.url, message: 'Protected method' Auth Filter
- 32. @Catch(ForbiddenException) export class AuthFilter implements ExceptionFilter { catch(exception: ForbiddenException, host: ArgumentsHost) { const ctx = host.switchToHttp(); const response = ctx.getResponse(); const request = ctx.getRequest(); const status = exception.getStatus(); response.status(status).json({ statusCode: status, timestamp: new Date().toISOString(), path: request.url, message: 'Protected method' Auth Filter
- 33. @Catch(ForbiddenException) export class AuthFilter implements ExceptionFilter { catch(exception: ForbiddenException, host: ArgumentsHost) { const ctx = host.switchToHttp(); const response = ctx.getResponse(); const request = ctx.getRequest(); const status = exception.getStatus(); response.status(status).json({ statusCode: status, timestamp: new Date().toISOString(), path: request.url, message: 'Protected method' Auth Filter
- 34. ControllerClient Transform input into desired output. validate input data Pipes Guard Filter Filter Pipe Pipe
- 35. @Injectable() export class ValidatePipe implements PipeTransform { transform(value: any, metadata: ArgumentMetadata) { return value; } } Basic Pipe
- 36. @Injectable() export class ValidatePipe implements PipeTransform { transform(value: any, metadata: ArgumentMetadata) { return value; } } Basic Pipe
- 37. @Injectable() export class ValidatePipe implements PipeTransform { transform(value: any, metadata: ArgumentMetadata) { return value; } } Basic Pipe
- 38. ControllerClient bind extra logic before / after method execution Interceptors Guard Filter Filter Pipe Pipe Interceptor Interceptor
- 39. @Injectable() export class LogInterceptor implements NestInterceptor { intercept(context: ExecutionContext, next: CallHandler): Observable<any> { const requestInfo = { time: new Date().toLocaleTimeString(), controller: context.getClass().name, method: context.getHandler().name }; console.log(requestInfo); return next.handle(); } } Log Interceptors
- 40. @Injectable() export class LogInterceptor implements NestInterceptor { intercept(context: ExecutionContext, next: CallHandler): Observable<any> { const requestInfo = { time: new Date().toLocaleTimeString(), controller: context.getClass().name, method: context.getHandler().name }; console.log(requestInfo); return next.handle(); } } Log Interceptors
- 41. @Injectable() export class LogInterceptor implements NestInterceptor { intercept(context: ExecutionContext, next: CallHandler): Observable<any> { const requestInfo = { time: new Date().toLocaleTimeString(), controller: context.getClass().name, method: context.getHandler().name }; console.log(requestInfo); return next.handle(); } } Log Interceptors
- 42. Where to go from here
- 43. Freedom within the Frame Choose your patterns
- 44. Freedom within the Frame Choose your database