thespringreststack-130612235338-phpapp01.pdf

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B U I L D I N G R E S T S E RV I C E S W I T H github.com/joshlong/the-spring-rest-stack Spring Josh Long (⻰龙之春) @starbuxman joshlong.com josh@joshlong.com slideshare.net/joshlong github.com/joshlong speakerdeck.com/joshlong

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GITHUB.COM/JOSHLONG/THE-SPRING-REST-STACK ABOUT ME About Josh Long (⻰龙之春) Spring Developer Advocate, Pivotal Jean Claude van Damme! Java mascot Duke some thing’s I’ve authored... @starbuxman josh@joshlong.com slideshare.net/joshlong github.com/joshlong speakerdeck.com/joshlong

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Starting with Spring T H E S P R I N G R E S T S TA C K

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GITHUB.COM/JOSHLONG/THE-SPRING-REST-STACK SPRING IO WEB Controllers, REST,  WebSocket INTEGRATION Channels, Adapters,  Filters, Transformers BATCH Jobs, Steps,  Readers, Writers BIG DATA Ingestion, Export,  Orchestration, Hadoop DATA NON-RELATIONAL RELATIONAL CORE GROOVY FRAMEWORK SECURITY REACTOR GRAILS Full-stack, Web XD Stream, Taps, Jobs BOOT Bootable, Minimal, Ops-Ready

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GITHUB.COM/JOSHLONG/THE-SPRING-REST-STACK A NEW HOME FOR SPRING

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GITHUB.COM/JOSHLONG/THE-SPRING-REST-STACK A NEW HOME FOR SPRING

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GITHUB.COM/JOSHLONG/THE-SPRING-REST-STACK SPRING 4 websockets : supports JSR 356, native APIs ! Async RestTemplate   based on NIO 2 HTTP client in JDK.  Java SE 8 and Java EE 7 extends support   to emerging platforms

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GITHUB.COM/JOSHLONG/THE-SPRING-REST-STACK SPRING 4 @Conditional provides the ability to conditionally   create a bean ! ! ! ! ! And, best of all, @Conditional powers Spring Boot! @Conditional (NasdaqIsUpCondition.class)  @Bean  Mongo extraMongoNode(){ // ... }

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GITHUB.COM/JOSHLONG/THE-SPRING-REST-STACK SPRING BOOT single point of focus, production- ready, easy to customize ! Installation: > Java 1.6 or better > Maven 3.0 or better > optionally install spring CLI   (or gvm or brew)

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Demonstration Take Spring Boot CLI for  a spin around the block !

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Demonstration Take Spring Boot around the track. !

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T H E S P R I N G R E S T S TA C K Testing

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Demonstration how to write unit tests with Spring

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Spring MVC T H E S P R I N G R E S T S TA C K

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GITHUB.COM/JOSHLONG/THE-SPRING-REST-STACK MODEL VIEW CONTROLLER DispatcherServlet controller view template delegate request delegate rendering of response render response return control model model incoming requests return response stop me if you’ve heard this one before     ...

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GITHUB.COM/JOSHLONG/THE-SPRING-REST-STACK INSTALLING SPRING MVC org.springframework.web.context.ContextLoaderListener contextInitializerClasses my.ApplicationContextInitializer contextClass org.springframework.web.context.support.AnnotationConﬁgWebApplicationContext appServlet org.springframework.web.servlet.DispatcherServlet contextConﬁgLocation ` 1 appServlet / web.xml

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GITHUB.COM/JOSHLONG/THE-SPRING-REST-STACK INSTALLING SPRING MVC ! public class SampleWebApplicationInitializer implements WebApplicationInitializer { ! public void onStartup(ServletContext sc) throws ServletException { AnnotationConfigWebApplicationContext ac = new AnnotationConfigWebApplicationContext(); ac.setServletContext(sc); ac.scan( “a.package.full.of.services”, “a.package.full.of.controllers” ); ! sc.addServlet("spring", new DispatcherServlet(ac)); ! // register filters, other servlets, etc., to get Spring and Spring Boot working } } WebApplicationInitializer ~= Java web.xml

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GITHUB.COM/JOSHLONG/THE-SPRING-REST-STACK INSTALLING SPRING MVC public class SimplerDispatcherServletInitializer extends AbstractAnnotationConfigDispatcherServletInitializer { ! @Override protected Class>[] getRootConfigClasses() { return new Class>[]{ ServiceConfiguration.class }; } ! @Override protected Class>[] getServletConfigClasses() { return new Class>[]{ WebMvcConfiguration.class }; } ! @Override protected String[] getServletMappings() { return new String[]{"/*"}; } } or, just fill out the form...

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GITHUB.COM/JOSHLONG/THE-SPRING-REST-STACK INSTALLING SPRING MVC @ComponentScan @EnableAutoConﬁguration public class Application extends SpringBootServletInitializer { ! private static Class< Application> applicationClass = Application.class; ! public static void main(String[] args) { SpringApplication.run(applicationClass); } ! @Override protected SpringApplicationBuilder conﬁgure(SpringApplicationBuilder application) { return application.sources(applicationClass); } } ! or, just use Spring Boot and never worry about it

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GITHUB.COM/JOSHLONG/THE-SPRING-REST-STACK A RICH SERVLET TOOLKIT HttpRequestHandlers supports remoting technologies : Caucho, HTTP Invoker, etc. DelegatingFilterProxy javax.ﬁlter.Filter that delegates to a Spring-managed bean HandlerInterceptor wraps requests to HttpRequestHandlers ServletWrappingController lets you force requests to a servlet through the Spring Handler chain WebApplicationContextUtils look up the current ApplicationContext given a ServletContext HiddenHttpMethodFilter routes HTTP requests to the appropriate endpoint other niceties Spring’s web support provides:

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T H E S P R I N G R E S T S TA C K REST Essentials

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GITHUB.COM/JOSHLONG/THE-SPRING-REST-STACK MOTIVATIONS FOR REST meanwhile, in the enterprise, somebody is using SOAP because it’s “SIMPLE”

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GITHUB.COM/JOSHLONG/THE-SPRING-REST-STACK WHAT IS REST? REST is an architectural constraint based on HTTP 1.1, and created as part of Roy Fielding’s doctoral dissertation in 2000.    It embraces HTTP.   It’s a style, not a standard http://en.wikipedia.org/wiki/Representational_state_transfer 

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GITHUB.COM/JOSHLONG/THE-SPRING-REST-STACK WHAT IS REST? REST has no hard and fast rules. REST is an architectural style, not a standard. REST uses Headers to describe requests & responses REST embraces HTTP verbs. (DRY)

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GITHUB.COM/JOSHLONG/THE-SPRING-REST-STACK HTTP VERBS GET /users/21 GET requests retrieve information. GET can have side-effects (but it’s unexpected) GET can be conditional, or partial:   If-Modiﬁed-Since, Range !

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GITHUB.COM/JOSHLONG/THE-SPRING-REST-STACK HTTP VERBS DELETE requests that a resource be removed, though the deletion doesn’t have to be immediate. DELETE /users/21

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GITHUB.COM/JOSHLONG/THE-SPRING-REST-STACK HTTP VERBS POST requests that the resource do something with the enclosed entity POST can be used to create or update.   ! POST /users { “ﬁrstName”: “Juergen” }

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GITHUB.COM/JOSHLONG/THE-SPRING-REST-STACK HTTP VERBS PUT requests that the entity be stored at a URI PUT can be used to create or update. PUT /users/21 { “ﬁrstName”: “Juergen” }

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GITHUB.COM/JOSHLONG/THE-SPRING-REST-STACK STATUS CODES status codes convey the result of the server’s attempt to satisfy the request.     Categories: 1xx: informational  2xx: success  3xx: redirection  4xx: client error   5xx: server error  

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GITHUB.COM/JOSHLONG/THE-SPRING-REST-STACK STATUS CODES 200 OK - Everything worked ! 201 Created - Returns a Location header for new resource ! 202 Accepted - server has accepted the request, but it is not yet complete. Status URI optionally conveyed in Location header

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GITHUB.COM/JOSHLONG/THE-SPRING-REST-STACK STATUS CODES 400 Bad Request - Malformed Syntax. Retry with change. ! 401 Unauthorized - authentication is required   403 Forbidden - server has understood, but refuses request    404 Not Found - server can’t find a resource for URI   406 Incompatible - incompatible Accept headers specified  409 Conﬂict - resource conflicts with client request

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GITHUB.COM/JOSHLONG/THE-SPRING-REST-STACK CONTENT NEGOTIATION Clients and services must agree on a representation media type through content negotiation. ! Client specifies what it wants through Accept header   Server specifies what it produces through Content-Type header !

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GITHUB.COM/JOSHLONG/THE-SPRING-REST-STACK CONTENT NEGOTIATION If no match is made, the client will receive a 406 Not Acceptable

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GITHUB.COM/JOSHLONG/THE-SPRING-REST-STACK CONTENT NEGOTIATION Spring MVC supports multiple types of content negotiation through its ContentNegotiationStrategy: e.g., Accept header, URL extension, request parameters, or a fixed type 

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GITHUB.COM/JOSHLONG/THE-SPRING-REST-STACK SOME REST POWER TOOLS Advanced REST Client

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GITHUB.COM/JOSHLONG/THE-SPRING-REST-STACK SOME REST POWER TOOLS Poster

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GITHUB.COM/JOSHLONG/THE-SPRING-REST-STACK SOME REST POWER TOOLS ➜ ~ curl -X POST -u android-crm:123456 http://localhost:8080/oauth/token \  -H "Accept: application/json" \   -d "password=......" ! {"access_token":"426481ea-c3eb-45a0-8b2d-d1f9cfae0fcc","token_type":"bearer","expires ! ➜ ~ curl

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T H E S P R I N G R E S T S TA C K Towards Hypermedia

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GITHUB.COM/JOSHLONG/THE-SPRING-REST-STACK THE MATURITY MODEL The Richardson Maturity Model is a way to grade your API according to the REST constraints with 4 levels of increasing compliance ! http://martinfowler.com/articles/richardsonMaturityModel.html

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GITHUB.COM/JOSHLONG/THE-SPRING-REST-STACK THE MATURITY MODEL The Richardson Maturity Model     Level 0: swamp of POX  http://martinfowler.com/articles/richardsonMaturityModel.html Uses HTTP mainly as a tunnel through one URI  e.g., SOAP, XML-RPC    Usually features on HTTP verb (POST) 

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GITHUB.COM/JOSHLONG/THE-SPRING-REST-STACK THE MATURITY MODEL The Richardson Maturity Model     Level 1: resources  http://martinfowler.com/articles/richardsonMaturityModel.html Multiple URIs to distinguish related nouns   e.g., /articles/1, /articles/2, vs. just /articles   

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GITHUB.COM/JOSHLONG/THE-SPRING-REST-STACK THE MATURITY MODEL The Richardson Maturity Model     Level 2: HTTP verbs  http://martinfowler.com/articles/richardsonMaturityModel.html leverage transport-native properties to enhance service   e.g., HTTP GET and PUT and DELETE and POST    Uses idiomatic HTTP controls like status codes, headers  

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Demonstration Our first @RestController

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GITHUB.COM/JOSHLONG/THE-SPRING-REST-STACK HATEOAS The Richardson Maturity Model     Level 3: Hypermedia Controls (aka, HATEOAS)  http://martinfowler.com/articles/richardsonMaturityModel.html No a priori knowledge of service required  Navigation options are provided by service and hypermedia controls    Promotes longevity through a uniform interface   

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GITHUB.COM/JOSHLONG/THE-SPRING-REST-STACK HATEOAS Links provide possible navigations from a given resource ! Links are dynamic, based on resource state. ! ! { href: “http://...:8080/users/232/customers”, rel: “customers” }

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Demonstration Working with Hypermedia and   Spring HATEOAS

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GITHUB.COM/JOSHLONG/THE-SPRING-REST-STACK SPRING DATA REST Spring Data REST simplifies the   generic data-centric @Controllers ! Builds on top of Spring Data Repository support: @RestResource (path = "users", rel = "users")   public interface UserRepository extends PagingAndSortingRepository { ! User ﬁndByUsername(@Param ("username") String username); ! ! ! select u from User where u.username = ?

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GITHUB.COM/JOSHLONG/THE-SPRING-REST-STACK SPRING DATA REST Spring Data REST simplifies the   generic data-centric @Controllers ! Builds on top of Spring Data Repository support: @RestResource (path = "users", rel = "users")   public interface UserRepository extends PagingAndSortingRepository { ! List findUsersByFirstNameOrLastNameOrUsername(  @Param ("firstName") String firstName,   @Param ("lastName") String lastName,   @Param ("username") String username); }

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GITHUB.COM/JOSHLONG/THE-SPRING-REST-STACK SPRING DATA REST Spring Data REST simplifies the   generic data-centric @Controllers ! Builds on top of Spring Data Repository support: @RestResource (path = "users", rel = "users")   public interface UserRepository extends PagingAndSortingRepository { ! List findUsersByFirstNameOrLastNameOrUsername(  @Param ("firstName") String firstName,   @Param ("lastName") String lastName,   @Param ("username") String username); } select u from User u where u.username = ? or u.firstName = ? or u.lastName = ?

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T H E S P R I N G R E S T S TA C K Testing REST

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Demonstration Testing web services with   Spring MVC Test framework

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T H E S P R I N G R E S T S TA C K Error Handling

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GITHUB.COM/JOSHLONG/THE-SPRING-REST-STACK HANDLING ERRORS IN A REST API Developers learn to use an API through errors Extreme programming and Test-Driven development embrace this truth ! Errors introduce transparency

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GITHUB.COM/JOSHLONG/THE-SPRING-REST-STACK STATUS CODES Status codes map to errors pick a meaningful subset of the 70+ status codes 200 - OK   201 - Created  304 - Created - Not Modified  400 - Bad Request   401 - Unauthorized  403 - Forbidden  404 - Not Found  500 - Internal Server Error  https://blog.apigee.com/detail/restful_api_design_what_about_errors

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GITHUB.COM/JOSHLONG/THE-SPRING-REST-STACK DESCRIPTIVE ERRORS Send meaningful errors along with status codes https://blog.apigee.com/detail/restful_api_design_what_about_errors { "message": "authentication failed", "errors": [ { "resource": "Issue", "ﬁeld": "title", "code": "missing_ﬁeld" } ] } { "type": "authentication", "message": “the username and password provided are invalid” , "status": “401” }

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GITHUB.COM/JOSHLONG/THE-SPRING-REST-STACK DESCRIPTIVE ERRORS application/vnd.error+json & application/vnd.error+xml https://github.com/blongden/vnd.error { "logref": 42, "message": "Validation failed", "_links": { "help": { "href": "http://.../", "title": "Error Information" }, "describes": { "href": "http://.../", "title": "Error Description" } } }

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Demonstration Handling errors with vnd.errors and @ControllerAdvice

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Demonstration Using @ControllerAdvice

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T H E S P R I N G R E S T S TA C K API Versioning

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GITHUB.COM/JOSHLONG/THE-SPRING-REST-STACK VERSIONING YOUR API Build a version into your API ! API versions can be dealt with one of two ways: through API URIs: https://api.foo.com/v1 through media types: application/vnd.company.urapp-v3+json

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T H E S P R I N G R E S T S TA C K Security

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GITHUB.COM/JOSHLONG/THE-SPRING-REST-STACK SPRING SECURITY Security is hard. Don’t reinvent the wheel! ! Things to worry about when developing web applications? EVERYTHING ! (cross-site scripting, session fixation, identification, authorization, and authentication, encryption, and SO much more.)

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GITHUB.COM/JOSHLONG/THE-SPRING-REST-STACK SPRING SECURITY Spring Security is a modern security framework for a modern age ! Authentication is valid? Authentication Mechanism collects the details client submits authentication credentials Store Authentication in SecurityContextHolder No - retry! Yes process original request Authentication Mechanism collects the details! ! AuthenticationRequest is sent to AuthenticationManager! ! (passes it through a chain of AuthenticationProviders)! ! AuthenticationProvider asks a UserDetailsService for a UserDetails! ! The UserDetails object is used to build an Authentication object! ! !

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Demonstration adding a Spring Security sign in form to a regular application ! !

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GITHUB.COM/JOSHLONG/THE-SPRING-REST-STACK SECURING REST SERVICES Usernames and Passwords ! If you can trust the client to keep a secret like a password, then it can send the password using:   ...HTTP Basic - passwords are sent plaintext! ... HTTP Digest - hashed passwords, but still plaintext.   SSL/TLS encryption helps prevent man-in-the-middle attacks

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GITHUB.COM/JOSHLONG/THE-SPRING-REST-STACK SSL AND TLS So, SSL/TLS is...? ! an implementation of public key cryptography: ! ! ! public key cryptography only works because we all agree to trust well known root CAs so trust! wow

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GITHUB.COM/JOSHLONG/THE-SPRING-REST-STACK SSL AND TLS SSL/TLS is used routinely to verify the identify of servers. ! Normally, the client confirms the server, but the server rarely requires the client to transmit a certificate. ! It’s easy enough to setup SSL/TLS on your web server. !

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Demonstration Setting up SSL/TLS with embedded Apache Tomcat 7 and Spring Boot ! !

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GITHUB.COM/JOSHLONG/THE-SPRING-REST-STACK SSL AND TLS SSL/TLS can be used to identify the client to the server, through mutual authentication. ! ! browser/client must send their certificate, as well. @Override protected void conﬁgure(HttpSecurity http) throws Exception { http .authorizeRequests() .anyRequest().authenticated() .and() .x509(); }

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@Configuration @EnableWebMvcSecurity public class SecurityConfig extends WebSecurityConfigurerAdapter { ! @Autowired public void configureGlobal(AuthenticationManagerBuilder auth) throws Exception { auth. inMemoryAuthentication() .withUser("mia").password("password").roles("USER").and() .withUser("mario").password("password").roles("USER","ADMIN"); } ! @Override protected void configure(HttpSecurity http) throws Exception { http .authorizeRequests() .anyRequest().authenticated() .and() .x509(); } }

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Demonstration X509 Java configuration demo ! !

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GITHUB.COM/JOSHLONG/THE-SPRING-REST-STACK THE TROUBLE WITH PASSWORDS Tim Bray says: Passwords don’t scale ! Too easy to compromise. ! Updating all your clients whenever you change your password would be a nightmare! !

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GITHUB.COM/JOSHLONG/THE-SPRING-REST-STACK THE TROUBLE WITH PASSWORDS

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GITHUB.COM/JOSHLONG/THE-SPRING-REST-STACK X-AUTH Most people just want their own clients to be able to talk securely to their own services. ! x-auth offers one way of achieving this based on tokens ! !

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Demonstration A custom x-auth example

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GITHUB.COM/JOSHLONG/THE-SPRING-REST-STACK OAUTH OAuth is a way for one (automated) process to securely identify itself to another ! Assumes a user context: ! “I authorize $CLIENTX to act on $USER_Y’s behalf” ! OAuth is a way of authorizing a client with particular access (scopes) !

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GITHUB.COM/JOSHLONG/THE-SPRING-REST-STACK OAUTH

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GITHUB.COM/JOSHLONG/THE-SPRING-REST-STACK OAUTH

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GITHUB.COM/JOSHLONG/THE-SPRING-REST-STACK OAUTH

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Demonstration Spring Security OAuth in the oauth module

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Demonstration Writing a unit test for an OAuth service using the Spring MVC test framework

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T H E S P R I N G R E S T S TA C K The Connected Web of APIs

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GITHUB.COM/JOSHLONG/THE-SPRING-REST-STACK A CONNECTED WORLD IN 60 SECONDS 3125 photos uploaded 7630 messages sent 7610 searches 2MM videos viewed 2000 checkins 175k tweets 1090 visitors 700k messages sent * source: visual.ly/60-seconds-social-media A Connected World in 00:60 seconds

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GITHUB.COM/JOSHLONG/THE-SPRING-REST-STACK SPRING SOCIAL Spring Social provides an authentication and   authorization client for OAuth (1.0, 1.0a, 2.0) ! Provides type-safe API bindings for various services

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GITHUB.COM/JOSHLONG/THE-SPRING-REST-STACK • Body Level One Body Level Two Body Level Three Body Level Four Body Level Five BINDINGS... SPRING SOCIAL BINDINGS

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GITHUB.COM/JOSHLONG/THE-SPRING-REST-STACK SPRING SOCIAL BINDINGS

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Demonstration Using Spring Social in an Application

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Demonstration Building Your own Spring Social binding

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T H E S P R I N G R E S T S TA C K Deployment

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GITHUB.COM/JOSHLONG/THE-SPRING-REST-STACK MICRO SERVICE ARCHITECTURE Micro Services ... ! Promote single responsibility principle ! Promote loosely coupled, focused services. (SOLID at the architecture level) ! Don’t like it? Throw it away! In object-oriented programming, the single responsibility principle states that every class should have a single responsibility, and that responsibility should be entirely encapsulated by the class. All its services should be narrowly aligned with that responsibility.! * * http://en.wikipedia.org/wiki/Single_responsibility_principle

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GITHUB.COM/JOSHLONG/THE-SPRING-REST-STACK EMBEDDED WEB SERVERS Spring Boot supports Apache Tomcat 7 by default. ! Easy to switch to Jetty, or Tomcat 8

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Demonstration Switching embedded web servers

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GITHUB.COM/JOSHLONG/THE-SPRING-REST-STACK TRADITIONAL/CLASSIC SERVERS

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Demonstration From fat .jar to .war

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GITHUB.COM/JOSHLONG/THE-SPRING-REST-STACK REST DESIGN WITH SPRING SPRING WORKS WELL IN THE CLOUD CLOUD

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Demonstration To the cloud!

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GITHUB.COM/JOSHLONG/THE-SPRING-REST-STACK PRODUCTION READY REST Spring Boot is production-ready, by default ! Comes out of the box with smart monitoring and management tools, the CrashD server, etc. ! ! !

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Demonstration production ready REST services with Boot

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GITHUB.COM/JOSHLONG/THE-SPRING-REST-STACK NEXT STEPS Spring IO Guides http://spring.io/guides ! Roy Fielding’s Dissertation introduces REST http://www.ics.uci.edu/~fielding/pubs/dissertation/evaluation.htm#sec_6_1%7C ! The Spring REST Shell http://github.com/jbrisbin/rest-shell ! Spring Security, Security OAuth, Spring Data REST, HATEOAS, Social http://github.com/spring-projects ! Spring MVC Test Framework http://docs.spring.io/spring/docs/4.0.x/spring-framework-reference/html/testing.html !

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GITHUB.COM/JOSHLONG/THE-SPRING-REST-STACK NEXT STEPS Oliver Gierke’s talk on Hypermedia from Øredev   @ http://vimeo.com/53214577   Lez Hazelwood’s talk on designing a beautiful JSON+REST API   Ben Hale’s talk on REST API design with Spring from SpringOne2GX 2012   @ http://www.youtube.com/watch?v=wylViAqNiRA   My links: github.com/joshlong/the-spring-rest-stack slideshare.net/joshlong/rest-apis-with-spring @starbuxman !

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GITHUB.COM/JOSHLONG/THE-SPRING-REST-STACK REST DESIGN WITH SPRING github.com/joshlong/the-spring-rest-stack @starbuxman josh@joshlong.com slideshare.net/joshlong github.com/joshlong speakerdeck.com/joshlong