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thespringreststack-130612235338-phpapp01.pdf

Josh Long
September 18, 2014
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 thespringreststack-130612235338-phpapp01.pdf

Josh Long

September 18, 2014
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  1. 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 [email protected] slideshare.net/joshlong github.com/joshlong speakerdeck.com/joshlong
  2. 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 [email protected] slideshare.net/joshlong github.com/joshlong speakerdeck.com/joshlong
  3. Starting with Spring T H E S P R I

    N G R E S T S TA C K
  4. 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
  5. 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
  6. 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(){ // ... }
  7. 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)
  8. T H E S P R I N G R

    E S T S TA C K Testing
  9. Spring MVC T H E S P R I N

    G R E S T S TA C K
  10. 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 
 
 ...
  11. GITHUB.COM/JOSHLONG/THE-SPRING-REST-STACK INSTALLING SPRING MVC <?xml version="1.0" encoding="UTF-8"?> <web-app version="2.5" xmlns="http://java.sun.com/xml/ns/javaee"

    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"> <distributable/> <listener> <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class> </listener> <context-param> <param-name>contextInitializerClasses</param-name> <param-value>my.ApplicationContextInitializer</param-value> </context-param> <context-param> <param-name>contextClass</param-name> <param-value>org.springframework.web.context.support.AnnotationConfigWebApplicationContext </param-value> </context-param> <servlet> <servlet-name>appServlet</servlet-name> <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class> <init-param> <param-name>contextConfigLocation</param-name> <param-value></param-value> </init-param> ` <load-on-startup>1</load-on-startup> </servlet> <servlet-mapping> <servlet-name>appServlet</servlet-name> <url-pattern>/</url-pattern> </servlet-mapping> </web-app> web.xml
  12. 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
  13. 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...
  14. 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
  15. 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:
  16. T H E S P R I N G R

    E S T S TA C K REST Essentials
  17. 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

  18. 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)
  19. 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 !
  20. 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
  21. 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” }
  22. 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” }
  23. 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 

  24. 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
  25. 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
  26. 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 !
  27. 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

  28. 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
  29. T H E S P R I N G R

    E S T S TA C K Towards Hypermedia
  30. 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
  31. 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)

  32. 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
 

  33. 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 

  34. 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
 

  35. GITHUB.COM/JOSHLONG/THE-SPRING-REST-STACK HATEOAS Links provide possible navigations from a given resource

    ! Links are dynamic, based on resource state. ! <link href=“http://...:8080/users/232/customers” 
 rel= “customers”/> ! { href: “http://...:8080/users/232/customers”, rel: “customers” }
  36. 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, Long> { ! User findByUsername(@Param ("username") String username); !
  37. 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, Long> { ! User findByUsername(@Param ("username") String username); ! ! ! select u from User where u.username = ?
  38. 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, Long> { ! List<User> findUsersByFirstNameOrLastNameOrUsername(
 @Param ("firstName") String firstName, 
 @Param ("lastName") String lastName, 
 @Param ("username") String username); }
  39. 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, Long> { ! List<User> 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 = ?
  40. T H E S P R I N G R

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

    E S T S TA C K Error Handling
  42. 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
  43. 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
  44. 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” }
  45. 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" } } }
  46. T H E S P R I N G R

    E S T S TA C K API Versioning
  47. 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
  48. T H E S P R I N G R

    E S T S TA C K Security
  49. 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.)
  50. 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
  51. 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! ! !
  52. 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
  53. 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
  54. 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. !
  55. 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(); }
  56. @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(); } }
  57. 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! !
  58. 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 ! !
  59. 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) !
  60. T H E S P R I N G R

    E S T S TA C K The Connected Web of APIs
  61. 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
  62. 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
  63. 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
  64. T H E S P R I N G R

    E S T S TA C K Deployment
  65. 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
  66. 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. ! ! !
  67. 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 !
  68. 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 !