Servers ❤️ Kotlin

Transcript

1. Servers ❤ Kotlin Ryan Harter @rharter

2. Ktor

3. Ktor Easy to use, fun and asynchronous.

4. Ktor Easy to use, fun and asynchronous. Composable, DSL based

   web services in Kotlin

5. Ktor Application

6. Ktor Application Jetty Netty Tomcat Servlet

7. Ktor Application Feature Feature Feature Feature Servlet

8. Ktor Application Feature Feature Feature Feature Routing HTML Templates Serialization

   Authentication Servlet

9. Ktor

10. Ktor Verify

11. Ktor Verify Admin

12. call.respond("Hello World") post("/verify") { routing { fun Application.verify() { }

    } }

13. call.respond("Hello World") post("/verify") { routing { fun Application.verify() { }

    } }

14. call.respond("Hello World") post("/verify") { routing { fun Application.verify() { }

    } }

15. call.respond("Hello World") post("/verify") { routing { fun Application.verify() { }

    } }

16. call.respond("Hello World") post("/verify") { routing { fun Application.verify() { }

    } }

17. → curl -X POST -d '' http://localhost:8080/verify

18. → curl -X POST -d '' http://localhost:8080/verify Hello World

19. Typed Responses

20. call.respond("Hello World") post("/verify") { routing { fun Application.verify() { }

    } }

21. call.respond(Response(status = "OK")) post("/verify") { routing { fun Application.verify() {

    } } } data class Response(val status: String)

22. → curl -X POST -d '' http://localhost:8080/verify

23. → curl -X POST -d '' http://localhost:8080/verify →

24. call.respond(Response(status = "OK")) post("/verify") { routing { fun Application.verify() {

    } } } data class Response(val status: String)

25. call.respond(Response(status = "OK")) post("/verify") { routing { fun Application.verify() {

    } } } data class Response(val status: String) install(StatusPages)

26. call.respond(Response(status = "OK")) post("/verify") { routing { fun Application.verify() {

    } } } data class Response(val status: String) install(StatusPages) { } exception<Throwable> { e -> }

27. call.respond(Response(status = "OK")) post("/verify") { routing { fun Application.verify() {

    } } } data class Response(val status: String) install(StatusPages) { } exception<Throwable> { e -> call.respondText(e.localizedMessage, ContentType.Text.Plain, HttpStatusCode.InternalServerError) }

28. call.respond(Response(status = "OK")) post("/verify") { routing { fun Application.verify() {

    } } } data class Response(val status: String) install(StatusPages) { } exception<Throwable> { e -> call.respondText(e.localizedMessage, ContentType.Text.Plain, HttpStatusCode.InternalServerError) }

29. → curl -X POST -d '' http://localhost:8080/verify

30. → curl -X POST -d '' http://localhost:8080/verify Cannot transform this

    request's content to class com.ryanharter.example.Response

31. call.respond(Response(status = "OK")) post("/verify") { routing { fun Application.verify() {

    } } } data class Response(val status: String) install(StatusPages) { } exception<Throwable> { e -> call.respondText(e.localizedMessage, ContentType.Text.Plain, HttpStatusCode.InternalServerError) }

32. install(StatusPages) { }1 call.respond(Response(status = "OK")) post("/verify") { routing {

    fun Application.verify() { } } } data class Response(val status: String) ...

33. call.respond(Response(status = "OK")) post("/verify") { routing { fun Application.verify() {

    } } } data class Response(val status: String) install(ContentNegotiation) ≈ install(StatusPages) { }1 ... ≈

34. call.respond(Response(status = "OK")) post("/verify") { routing { fun Application.verify() {

    } } } data class Response(val status: String) install(ContentNegotiation) ≈ install(StatusPages) { }1 ... ≈ { }2

35. call.respond(Response(status = "OK")) post("/verify") { routing { fun Application.verify() {

    } } } data class Response(val status: String) install(ContentNegotiation) ≈ install(StatusPages) { }1 ... ≈ { }2 moshi() ≈ ≈

36. call.respond(Response(status = "OK")) post("/verify") { routing { fun Application.verify() {

    } } } data class Response(val status: String) install(ContentNegotiation) ≈ install(StatusPages) { }1 ... ≈ { }2 moshi() ≈ ≈ @JsonClass(generateAdapter = true)

37. call.respond(Response(status = "OK")) post("/verify") { routing { fun Application.verify() {

    } } } data class Response(val status: String) install(ContentNegotiation) install(StatusPages) { }1 ... { }2 moshi() @JsonClass(generateAdapter = true)

38. → curl -X POST -d '' http://localhost:8080/verify

39. → curl -X POST -d '' http://localhost:8080/verify {"status":"OK"}

40. call.respond(Response(status = "OK")) post("/verify") { routing { fun Application.verify() {

    } } } data class Response(val status: String) install(ContentNegotiation) install(StatusPages) { }1 ... { }2 moshi() @JsonClass(generateAdapter = true)

41. call.respond(Response(status = "OK")) post("/verify") { routing { fun Application.verify() {

    } } } data class Response(val status: String) install(ContentNegotiation) install(StatusPages) { }1 ... { }2 @JsonClass(generateAdapter = true) ...

42. Typed Requests

43. None
44. None

45. call.respond(Response(status = "OK")) post("/verify") { routing { fun Application.verify() {

    } } } data class Response(val status: String) install(ContentNegotiation) install(StatusPages) { }1 ... { }2 @JsonClass(generateAdapter = true) ...

46. call.respond(Response(status = "OK")) post("/verify") { routing { fun Application.verify() {

    } } } data class Response(val status: String) install(ContentNegotiation) install(StatusPages) { }1 ... { }2 @JsonClass(generateAdapter = true) ... ≈ ≈ ≈ ≈ @JsonClass(generateAdapter = true) data class Request( val userId: String, val packageName: String, val productId: String, val token: String )b

47. call.respond(Response(status = "OK")) post("/verify") { routing { fun Application.verify() {

    } } } data class Response(val status: String) install(ContentNegotiation) install(StatusPages) { }1 ... { }2 @JsonClass(generateAdapter = true) ... @JsonClass(generateAdapter = true) data class Request( val userId: String, val packageName: String, val productId: String, val token: String )b ≈ ≈ ≈ bird

48. @JsonClass(generateAdapter = true) data class Request( val userId: String, val

    packageName: String, val productId: String, val token: String )b post("/verify") { routing { fun Application.verify() { } } } data class Response(val status: String) install(ContentNegotiation) install(StatusPages) { }1 ... { }2 @JsonClass(generateAdapter = true) ... ≈ ≈ ≈ bird

49. @JsonClass(generateAdapter = true) data class Request( val userId: String, val

    packageName: String, val productId: String, val token: String )b post("/verify") { routing { fun Application.verify() { } } } data class Response(val status: String) install(ContentNegotiation) install(StatusPages) { }1 ... { }2 @JsonClass(generateAdapter = true) ... ≈ ≈ ≈ val request = call.receive<Request>() ≈ ≈ bird

50. @JsonClass(generateAdapter = true) data class Request( val userId: String, val

    packageName: String, val productId: String, val token: String )b post("/verify") { routing { fun Application.verify() { } } } data class Response(val status: String) install(ContentNegotiation) install(StatusPages) { }1 ... { }2 @JsonClass(generateAdapter = true) ... ≈ ≈ ≈ val request = call.receive<Request>() ≈ ≈ call.respond(request) bird

51. @JsonClass(generateAdapter = true) data class Request( val userId: String, val

    packageName: String, val productId: String, val token: String )b post("/verify") { routing { fun Application.verify() { } } } data class Response(val status: String) install(ContentNegotiation) install(StatusPages) { }1 ... { }2 @JsonClass(generateAdapter = true) ... val request = call.receive<Request>() call.respond(request)

52. →

53. → cat << EOF >> /tmp/request.json

54. → cat << EOF >> /tmp/request.json > { > "userId":

    "rharter", > "packageName": "com.pixite.pigment", > "productId": "com.pixite.pigment.subscription.monthly_t", > "token": “fpljlfogiejllhkebmjkpndm.AO-Oy5r83Kzef5afyMfL0suZM11l76cp_WdnWgOz... > } > EOF →

55. →

56. → curl -X POST —H "Content-Type: application/json" -d @/tmp/request.json \

    http://localhost:8080/verify

57. → curl -X POST -H "Content-Type: application/json" -d @/tmp/request.json \

    http://localhost:8080/verify {“userId”:”rharter","packageName":"com.pixite.pigment","productId":"com.pixite.pig ment.subscription.monthly_t","token":"fpljlfogiejllhkebmjkpndm.AO- J1Oy5r83Kzef5afyMfL0suZM11l76cp_WdnWgOz..."}

58. @JsonClass(generateAdapter = true) data class Request( val userId: String, val

    packageName: String, val productId: String, val token: String )b post("/verify") { routing { fun Application.verify() { } } } data class Response(val status: String) install(ContentNegotiation) install(StatusPages) { }1 ... { }2 @JsonClass(generateAdapter = true) ... val request = call.receive<Request>() call.respond(request)

59. @JsonClass(generateAdapter = true) data class Request( val userId: String, val

    packageName: String, val productId: String, val token: String )b post("/verify") { routing { fun Application.verify() { } } } install(ContentNegotiation) install(StatusPages) { }1 ... { }2 ... val request = call.receive<Request>() call.respond(request) ???

60. External Components

61. @JsonClass(generateAdapter = true) data class Request( val userId: String, val

    packageName: String, val productId: String, val token: String )b post("/verify") { routing { fun Application.verify() { } } } install(ContentNegotiation) install(StatusPages) { }1 ... { }2 ... val request = call.receive<Request>() call.respond(request) ???

62. @JsonClass(generateAdapter = true) data class Request( val userId: String, val

    packageName: String, val productId: String, val token: String )b post("/verify") { routing { fun Application.verify() { } } } install(ContentNegotiation) install(StatusPages) { }1 ... { }2 ... val request = call.receive<Request>() call.respond(request) // Find valid subscription in db or remotely ≈ ≈

63. @JsonClass(generateAdapter = true) data class Request( val userId: String, val

    packageName: String, val productId: String, val token: String )b post("/verify") { routing { fun Application.verify() { } } } install(ContentNegotiation) install(StatusPages) { }1 ... { }2 ... val request = call.receive<Request>() // Find valid subscription in db or remotely // Save to database ≈ ≈

64. // Return subscription or 404 @JsonClass(generateAdapter = true) data class

    Request( val userId: String, val packageName: String, val productId: String, val token: String )b post("/verify") { routing { fun Application.verify() { } } } install(ContentNegotiation) install(StatusPages) { }1 ... { }2 ... val request = call.receive<Request>() // Find valid subscription in db or remotely // Save to database ≈ ≈

65. interface Api { suspend fun findSubscription(userId: String, packageName: String, productId:

    String, token: String): Subscription? }

66. class PlayStore(serviceAccountFile: InputStream) : Store { private val publisher: AndroidPublisher

    by lazy {...} suspend fun findSubscription(userId: String, packageName: String, productId: String, token: String): Subscription? = coroutineScope { val response = async { publisher.purchases() .subscriptions() .get(packageName, productId, token) .execute() } response.await().asSubscription(ownerId, token) } }

67. class PlayStore(serviceAccountFile: InputStream) : Store { private val publisher: AndroidPublisher

    by lazy {...} suspend fun findSubscription(userId: String, packageName: String, productId: String, token: String): Subscription? = coroutineScope { val response = async { publisher.purchases() .subscriptions() .get(packageName, productId, token) .execute() } response.await().asSubscription(ownerId, token) } } class top class bottom

68. class PlayStore(serviceAccountFile: InputStream) : Store { private val publisher: AndroidPublisher

    by lazy {...} suspend fun findSubscription(userId: String, packageName: String, productId: String, token: String): Subscription? = coroutineScope { val response = async { publisher.purchases() .subscriptions() .get(packageName, productId, token) .execute() } response.await().asSubscription(ownerId, token) } } class top class bottom

69. interface Database { suspend fun subscription(subscriptionId: String): Subscription? suspend fun

    subscriptionByToken(token: String): Subscription? suspend fun subscriptionByUserId(userId: String): Subscription? suspend fun createSubscription(subscription: Subscription): Subscription }

70. // Return subscription or 404 @JsonClass(generateAdapter = true) data class

    Request( val userId: String, val packageName: String, val productId: String, val token: String )b post("/verify") { routing { fun Application.verify() { } } } install(ContentNegotiation) install(StatusPages) { }1 ... { }2 ... val request = call.receive<Request>() // Find valid subscription in db or remotely // Save to database

71. // Return subscription or 404 @JsonClass(generateAdapter = true) data class

    Request( val userId: String, val packageName: String, post("/verify") { routing { fun Application.verify() { } } } install(ContentNegotiation) install(StatusPages) { }1 ... { }2 ... val request = call.receive<Request>() // Find valid subscription in db or remotely // Save to database ≈ ≈ ≈ val api = TotallyRealApi() ≈ ≈ ≈

72. // Return subscription or 404 @JsonClass(generateAdapter = true) data class

    Request( val userId: String, post("/verify") { routing { fun Application.verify() { } } } install(ContentNegotiation) install(StatusPages) { }1 ... { }2 ... val request = call.receive<Request>() // Find valid subscription in db or remotely // Save to database ≈ ≈ ≈ val db = InMemoryDatabase() val api = TotallyRealApi() ≈ ≈ ≈

73. // Return subscription or 404 @JsonClass(generateAdapter = true) data class

    Request( val userId: String, post("/verify") { routing { fun Application.verify() { } } } install(ContentNegotiation) install(StatusPages) { }1 ... { }2 ... val request = call.receive<Request>() // Save to database ≈ ≈ ≈ val db = InMemoryDatabase() val api = TotallyRealApi() ≈ ≈ val subscription = db.subscriptionByUserId(request.userId)

74. // Return subscription or 404 @JsonClass(generateAdapter = true) data class

    Request( post("/verify") { routing { fun Application.verify() { } } } install(ContentNegotiation) install(StatusPages) { }1 ... { }2 ... val request = call.receive<Request>() ≈ ≈ val db = InMemoryDatabase() val api = TotallyRealApi() ≈ ?: api.findSubscription(request.userId, request.packageName request.productId, request.token) val subscription = db.subscriptionByUserId(request.userId)

75. ?: api.findSubscription(request.userId, request.packageName request.productId, request.token) // Return subscription or 404

    @JsonClass(generateAdapter = true) data class Request( post("/verify") { routing { fun Application.verify() { } } } install(ContentNegotiation) install(StatusPages) { }1 ... { }2 ... val request = call.receive<Request>() ≈ ≈ val db = InMemoryDatabase() val api = TotallyRealApi() ≈ ?.also { db.createSubscription(it) } val subscription = db.subscriptionByUserId(request.userId)

76. post("/verify") { routing { fun Application.verify() { } } install(ContentNegotiation)

    install(StatusPages) { }1 ... { }2 ... val request = call.receive<Request>() ≈ ≈ val db = InMemoryDatabase() val api = TotallyRealApi() val subscription = db.subscriptionByUserId(request.userId) if (subscription == null) { call.respond(HttpStatusCode.NotFound, "Subscription invalid.") } else { call.respond(subscription) } ?: api.findSubscription(request.userId, request.packageName request.productId, request.token) ?.also { db.createSubscription(it) }

77. → curl -X POST -H "Content-Type: application/json" -d @valid.json http://localhost:8080/verify

78. → curl -X POST -H "Content-Type: application/json" -d @valid.json http://localhost:8080/verify

    {“canceled":false,"expiryDate":"2018-10-12T04:35:21.000Z","id":"668245e4-b673-4258- ba7c-4b0367833e61","ownerId":"rharter","startDate":"2018-09-12T04:35:21.000Z","token":"token3"}

79. → curl -X POST -H "Content-Type: application/json" -d @valid.json http://localhost:8080/verify

    {“canceled":false,"expiryDate":"2018-10-12T04:35:21.000Z","id":"668245e4-b673-4258- ba7c-4b0367833e61","ownerId":"rharter","startDate":"2018-09-12T04:35:21.000Z","token":"token3"} → → curl -X POST -H "Content-Type: application/json" -d @invalid.json http://localhost:8080/verify

80. → curl -X POST -H "Content-Type: application/json" -d @valid.json http://localhost:8080/verify

    {“canceled":false,"expiryDate":"2018-10-12T04:35:21.000Z","id":"668245e4-b673-4258- ba7c-4b0367833e61","ownerId":"rharter","startDate":"2018-09-12T04:35:21.000Z","token":"token3"} → → curl -X POST -H "Content-Type: application/json" -d @invalid.json http://localhost:8080/verify Subscription invalid. →

81. Templates

82. post("/verify") { routing { fun Application.verify() { } } install(ContentNegotiation)

    install(StatusPages) { }1 ... { }2 ... val request = call.receive<Request>() val db = InMemoryDatabase() val api = TotallyRealApi() val subscription = db.subscriptionByUserId(request.userId) if (subscription == null) { call.respond(HttpStatusCode.NotFound, "Subscription invalid.") } else { call.respond(subscription) } ?: api.findSubscription(request.userId, request.packageName request.productId, request.token) ?.also { db.createSubscription(it) }

83. post("/verify") { routing { fun Application.verify() { } } install(ContentNegotiation)

    install(StatusPages) { }1 ... { }2 ... ... }3 ...

84. get(“/subscriptions") { routing { fun Application.verify() { } } install(ContentNegotiation)

    install(StatusPages) { }1 ... { }2 ... }4 ... post("/verify") {... }3

85. get(“/subscriptions") { routing { fun Application.verify() { } } install(ContentNegotiation)

    install(StatusPages) { }1 ... { }2 ... }4 ... post("/verify") {... }3 val subscriptions = db.subscriptions() call.respond(subscriptions)

86. http://localhost:8080/subscriptions [ { "id": "sub-1", "ownerId": "Bandalls", "token": "asdf98hn", "startDate":

    "Sep 11, 2018 11:35:21 PM", "expiryDate": "Oct 11, 2018 11:35:21 PM", "canceled": true }, { "id": "sub-2", "ownerId": "Editussion", "token": "asdf092s", "startDate": "Sep 11, 2018 11:35:21 PM", "expiryDate": "Oct 11, 2018 11:35:21 PM", "canceled": false }, { "id": "sub-3", "ownerId": "Liveltekah", "token": "gju0u0fe", "startDate": "Sep 11, 2018 11:35:21 PM", "expiryDate": "Oct 11, 2018 11:35:21 PM", "canceled": false }, { "id": "sub-4", "ownerId": "Ortspoon", "token": "diiefh48", "startDate": "Sep 11, 2018 11:35:21 PM", "expiryDate": "Oct 11, 2018 11:35:21 PM", "canceled": true }, { "id": "sub-5", "ownerId": "Reakefit", "token": "dg09uui2", http://localhost:8080/subs…

87. get(“/subscriptions") { routing { fun Application.verify() { } } install(ContentNegotiation)

    install(StatusPages) { }1 ... { }2 ... }4 ... post("/verify") {... }3 val subscriptions = db.subscriptions() call.respond(subscriptions)

88. install(FreeMarker) { get(“/subscriptions") { routing { fun Application.verify() { }

    } install(ContentNegotiation) install(StatusPages) { }1 ... { }2 ... }4 ... post("/verify") {... }3 val subscriptions = db.subscriptions() call.respond(subscriptions) }freemarker

89. install(FreeMarker) { get(“/subscriptions") { routing { fun Application.verify() { }

    } install(ContentNegotiation) install(StatusPages) { }1 ... { }2 ... }4 ... post("/verify") {... }3 val subscriptions = db.subscriptions() call.respond(subscriptions) }freemarker templateLoader = ClassTemplateLoader( this@module.javaClass.classLoader, "templates" )

90. install(FreeMarker) { get(“/subscriptions") { routing { fun Application.verify() { }

    } install(ContentNegotiation) install(StatusPages) { }1 ... { }2 ... }4 ... post("/verify") {... }3 val subscriptions = db.subscriptions() call.respond(subscriptions) }freemarker ...

91. install(FreeMarker) { get(“/subscriptions") { routing { fun Application.verify() { }

    } install(ContentNegotiation) install(StatusPages) { }1 ... { }2 ... }4 ... post("/verify") {... }3 val subscriptions = db.subscriptions() call.respond( }freemarker ... subscriptions)respond

92. install(FreeMarker) { get(“/subscriptions") { routing { fun Application.verify() { }

    } install(ContentNegotiation) install(StatusPages) { }1 ... { }2 ... }4 ... post("/verify") {... }3 val subscriptions = db.subscriptions() call.respond( }freemarker ... )respond FreeMarkerContent("subscriptions.ftl", mapOf("subscriptions" to )) subscriptions

93. install(FreeMarker) { get(“/subscriptions") { routing { fun Application.verify() { install(ContentNegotiation)

    install(StatusPages) { }1 ... { }2 ... ... val subscriptions = db.subscriptions() call.respond( }freemarker ... FreeMarkerContent("subscriptions.ftl", mapOf("subscriptions" to )) subscriptions } } }4 post("/verify") {... }3 )respond

94. install(FreeMarker) { get(“/subscriptions") { routing { fun Application.verify() { install(ContentNegotiation)

    install(StatusPages) { }1 ... { }2 ... ... val subscriptions = db.subscriptions() call.respond( }freemarker ... FreeMarkerContent("subscriptions.ftl", mapOf("subscriptions" to )) subscriptions } } }4 post("/verify") {... }3 )respond

95. <head> <link rel="stylesheet" href="https://fonts.googleapis.com/icon?family=Material+Icons"> <link rel="stylesheet" href="https://code.getmdl.io/1.3.0/material.indigo-pink.min.css"> <script defer src="https://code.getmdl.io/1.3.0/material.min.js"></script>

    </head> <body> <div class="demo-layout mdl-layout mdl-js-layout mdl-layout--fixed-header"> <header class="demo-header mdl-layout__header mdl-color--grey-100 mdl-color-text--grey-600"> <div class="mdl-layout__header-row"> <span class="mdl-layout-title">Home</span> <div class="mdl-layout-spacer"></div> <div class="mdl-textfield mdl-js-textfield mdl-textfield--expandable"> <label class="mdl-button mdl-js-button mdl-button--icon" for="search"> <i class="material-icons">search</i> </label> <div class="mdl-textfield__expandable-holder"> <input class="mdl-textfield__input" type="text" id="search"> <label class="mdl-textfield__label" for="search">Enter your query...</label> </div> </div> <button class="mdl-button mdl-js-button mdl-js-ripple-effect mdl-button--icon" id="hdrbtn"> <i class="material-icons">more_vert</i> </button> <ul class="mdl-menu mdl-js-menu mdl-js-ripple-effect mdl-menu--bottom-right" for="hdrbtn"> <li class="mdl-menu__item">About</li> <li class="mdl-menu__item">Contact</li> <li class="mdl-menu__item">Legal information</li> </ul> </div> </header> <main class="mdl-layout__content mdl-color--grey-100"> <div class="mdl-grid"> <table class="mdl-data-table mdl-js-data-table mdl-data-table--selectable mdl-color--white mdl-shadow--2dp mdl-cell mdl-cell--12-col"> <thead> <tr> <th class="mdl-data-table__cell--non-numeric">Owner ID</th> <th class="mdl-data-table__cell--non-numeric">Start Date</th> <th class="mdl-data-table__cell--non-numeric">Expiry Date</th> <th class="mdl-data-table__cell--non-numeric">Cancelled</th> </tr> </thead> <tbody> <#list subscriptions as subscription> <tr> <td class="mdl-data-table__cell--non-numeric">${subscription.ownerId}</td> <td class="mdl-data-table__cell--non-numeric">${subscription.startDate?date}</td> <td class="mdl-data-table__cell--non-numeric">${subscription.expiryDate?date}</td> <td class="mdl-data-table__cell--non-numeric"> ${subscription.canceled?string('yes', 'no')} </td> </tr> </#list> </tbody> </table> </div> </main> </div>

96. <th class="mdl-data-table__cell--non-numeric">Start Date</th> <th class="mdl-data-table__cell--non-numeric">Expiry Date</th> <th class="mdl-data-table__cell--non-numeric">Cancelled</th> </tr> </thead>

    <tbody> <#list subscriptions as subscription> <tr> <td class="mdl-data-table__cell--non-numeric">${subscription.ownerId}</td> <td class="mdl-data-table__cell--non-numeric">${subscription.startDate?date}</td> <td class="mdl-data-table__cell--non-numeric">${subscription.expiryDate?date}</td> <td class="mdl-data-table__cell--non-numeric"> ${subscription.canceled?string('yes', 'no')} </td> </tr> </#list> </tbody> /table> >

97. [ { "id": "sub-1", "ownerId": "Bandalls", "token": "asdf98hn", "startDate": "Sep

    11, 2018 11:35:21 PM", "expiryDate": "Oct 11, 2018 11:35:21 PM", "canceled": true }, { "id": "sub-2", "ownerId": "Editussion", "token": "asdf092s", "startDate": "Sep 11, 2018 11:35:21 PM", "expiryDate": "Oct 11, 2018 11:35:21 PM", "canceled": false }, { "id": "sub-3", "ownerId": "Liveltekah", "token": "gju0u0fe", "startDate": "Sep 11, 2018 11:35:21 PM", "expiryDate": "Oct 11, 2018 11:35:21 PM", "canceled": false }, { "id": "sub-4", "ownerId": "Ortspoon", "token": "diiefh48", "startDate": "Sep 11, 2018 11:35:21 PM", "expiryDate": "Oct 11, 2018 11:35:21 PM", "canceled": true }, { "id": "sub-5", "ownerId": "Reakefit", "token": "dg09uui2", http://localhost:8080/subscriptions http://localhost:8080/subs…

98. [ { "id": "sub-1", "ownerId": "Bandalls", "token": "asdf98hn", "startDate": "Sep

    11, 2018 11:35:21 PM", "expiryDate": "Oct 11, 2018 11:35:21 PM", "canceled": true }, { "id": "sub-2", "ownerId": "Editussion", "token": "asdf092s", "startDate": "Sep 11, 2018 11:35:21 PM", "expiryDate": "Oct 11, 2018 11:35:21 PM", "canceled": false }, { "id": "sub-3", "ownerId": "Liveltekah", "token": "gju0u0fe", "startDate": "Sep 11, 2018 11:35:21 PM", "expiryDate": "Oct 11, 2018 11:35:21 PM", "canceled": false }, { "id": "sub-4", "ownerId": "Ortspoon", "token": "diiefh48", "startDate": "Sep 11, 2018 11:35:21 PM", "expiryDate": "Oct 11, 2018 11:35:21 PM", "canceled": true }, { "id": "sub-5", "ownerId": "Reakefit", "token": "dg09uui2", http://localhost:8080/subscriptions http://localhost:8080/subs…

99. http://localhost:8080/subscriptions http://localhost:8080/subs…

100. Authentication

101. }routing install(FreeMarker) { get("/subscriptions") { routing { fun Application.verify() {

     install(ContentNegotiation) install(StatusPages) { }1 ... { }2 ... ... val subscriptions = db.subscriptions() call.respond( }freemarker ... FreeMarkerContent("subscriptions.ftl", mapOf("subscriptions" to )) subscriptions } }4 post("/verify") {... }3 )respond

102. }routing install(FreeMarker) { get("/subscriptions") { routing { fun Application.verify() {

     install(ContentNegotiation) install(StatusPages) { }1 ... { }2 ... }freemarker ... } }4 post("/verify") {... }3 ...

103. }routing install(FreeMarker) { get("/subscriptions") { routing { fun Application.verify() {

     install(ContentNegotiation) install(StatusPages) { }1 ... { }2 ... }freemarker ... } }4 post("/verify") {... }3 ... install(Authentication) s

104. install(FreeMarker) { get("/subscriptions") { routing { fun Application.verify() { install(ContentNegotiation)

     install(StatusPages) { }1 ... { }2 ... }freemarker ... } }4 post("/verify") {... }3 ... install(Authentication) {auth }auth }basic basic(name = "userAuth") {basic }routing s

105. install(FreeMarker) { get("/subscriptions") { routing { fun Application.verify() { install(ContentNegotiation)

     install(StatusPages) { }1 ... { }2 ... }freemarker ... } }4 post("/verify") {... }3 ... install(Authentication) {auth }auth }basic realm = "Verifier" basic(name = "userAuth") {basic }routing s

106. }routing install(FreeMarker) { get("/subscriptions") { routing { fun Application.verify() {

     install(ContentNegotiation) install(StatusPages) { }1 ... { }2 ... }freemarker ... } }4 post("/verify") {... }3 ... install(Authentication) s {auth }auth }validate }basic validate { credentials -> realm = "Verifier" basic(name = "userAuth") {basic

107. }routing install(FreeMarker) { get("/subscriptions") { routing { fun Application.verify() {

     install(ContentNegotiation) install(StatusPages) { }1 ... { }2 ... }freemarker ... } }4 post("/verify") {... }3 ... install(Authentication) s {auth }auth authService.authenticate(credentials.name, credentials.password) }validate }basic validate { credentials -> realm = "Verifier" basic(name = "userAuth") {basic

108. }routing install(FreeMarker) { get("/subscriptions") { routing { fun Application.verify() {

     install(ContentNegotiation) install(StatusPages) { }1 ... { }2 ... }freemarker ... } }4 post("/verify") {... }3 ... install(Authentication) s {auth }auth ...

109. }routing install(FreeMarker) { get("/subscriptions") { routing { fun Application.verify() {

     install(ContentNegotiation) install(StatusPages) { }1 ... { }2 ... }freemarker ... } }4 post("/verify") {... }3 ... install(Authentication) {auth }auth ...

110. get("/subscriptions") { fun Application.verify() { } } }4 post("/verify") {...

     }3 ... authenticate("userAuth") { } install(FreeMarker) { routing { install(ContentNegotiation) install(StatusPages) { }1 ... { }2 ... }freemarker ... install(Authentication) {auth }auth ...

111. fun Application.verify() { get("/subscriptions") { } } }4 post("/verify") {...

     }3 ... authenticate("userAuth") { } install(FreeMarker) { routing { install(ContentNegotiation) install(StatusPages) { }1 ... { }2 ... }freemarker ... install(Authentication) {auth }auth ...

112. fun Application.verify() { } } post("/verify") {... }3 authenticate("userAuth") {

     } get("/subscriptions") { val subscriptions = db.subscriptions() call.respond( FreeMarkerContent("subscriptions.ftl", mapOf("subscriptions" to subscriptions }4 )respond )) install(FreeMarker) { routing { install(ContentNegotiation) install(StatusPages) { }1 ... { }2 ... }freemarker ... install(Authentication) {auth }auth ...

113. fun Application.verify() { } } post("/verify") {... }3 authenticate("userAuth") {

     } get("/subscriptions") { val subscriptions = db.subscriptions() call.respond( FreeMarkerContent("subscriptions.ftl", mapOf( subscriptions }4 )respond val user = call.authentication.principal d "subscriptions" to )) install(FreeMarker) { routing { install(ContentNegotiation) install(StatusPages) { }1 ... { }2 ... }freemarker ... install(Authentication) {auth }auth ...

114. } val subscriptions = db.subscriptions() call.respond( FreeMarkerContent("subscriptions.ftl", mapOf( subscriptions }4

     )respond val user = call.authentication.principal d ) "subscriptions" to ) , "user" to user fun Application.verify() { authenticate("userAuth") { get("/subscriptions") { install(FreeMarker) { routing { install(ContentNegotiation) install(StatusPages) { }1 ... { }2 ... }freemarker ... install(Authentication) {auth }auth ...

115. [ { "id": "sub-1", "ownerId": "Bandalls", "token": "asdf98hn", "startDate": "Sep

     11, 2018 11:35:21 PM", "expiryDate": "Oct 11, 2018 11:35:21 PM", "canceled": true }, { "id": "sub-2", "ownerId": "Editussion", "token": "asdf092s", "startDate": "Sep 11, 2018 11:35:21 PM", "expiryDate": "Oct 11, 2018 11:35:21 PM", "canceled": false }, { "id": "sub-3", "ownerId": "Liveltekah", "token": "gju0u0fe", "startDate": "Sep 11, 2018 11:35:21 PM", "expiryDate": "Oct 11, 2018 11:35:21 PM", "canceled": false }, { "id": "sub-4", "ownerId": "Ortspoon", "token": "diiefh48", "startDate": "Sep 11, 2018 11:35:21 PM", "expiryDate": "Oct 11, 2018 11:35:21 PM", "canceled": true }, { "id": "sub-5", "ownerId": "Reakefit", "token": "dg09uui2", http://localhost:8080/subscriptions http://localhost:8080/subs…

116. http://localhost:8080/subscriptions http://localhost:8080/subs… Sign in http://localhost:8080 Username Password Sign in Cancel

117. http://localhost:8080/subscriptions http://localhost:8080/subs… Sign in http://localhost:8080 Username Password Sign in Cancel

     admin •••••••••••

118. http://localhost:8080/subscriptions http://localhost:8080/subs… Ryan

119. Forms

120. http://localhost:8080/subscriptions http://localhost:8080/subs… Ryan

121. http://localhost:8080/subscriptions http://localhost:8080/subs… Ryan

122. Ryan

123. } } post("/verify") {... }3 } }4 d fun Application.verify()

     { authenticate("userAuth") { get("/subscriptions") { install(FreeMarker) { routing { install(ContentNegotiation) install(StatusPages) { }1 ... { }2 ... }freemarker ... install(Authentication) {auth }auth ... ...

124. post("/verify") {... }3 } }4 authenticate("userAuth") { get("/subscriptions") { install(FreeMarker)

     { routing { }freemarker ... install(Authentication) {auth }auth ... ... post("/subscriptions") { }post get("/subscriptions") {

125. post("/verify") {... }3 } }4 authenticate("userAuth") { get("/subscriptions") { install(FreeMarker)

     { routing { }freemarker ... install(Authentication) {auth }auth ... ... post("/subscriptions") { }post get("/subscriptions") { val parameters = call.receiveParameters()

126. post("/verify") {... }3 } }4 authenticate("userAuth") { get("/subscriptions") { install(FreeMarker)

     { routing { }freemarker ... install(Authentication) {auth }auth ... ... post("/subscriptions") { }post get("/subscriptions") { val parameters = call.receiveParameters() val id = parameters[“id"] post("/subscriptions") { end post

127. post("/verify") {... }3 } }4 authenticate("userAuth") { get("/subscriptions") { install(FreeMarker)

     { routing { }freemarker ... install(Authentication) {auth }auth ... ... post("/subscriptions") { }post get("/subscriptions") { val parameters = call.receiveParameters() val id = parameters[“id"] ?: throw IllegalArgumentException("Missing parameter: id") post("/subscriptions") { end post

128. post("/verify") {... }3 } }4 authenticate("userAuth") { get("/subscriptions") { install(FreeMarker)

     { routing { }freemarker ... install(Authentication) {auth }auth ... ... post("/subscriptions") { }post get("/subscriptions") { val parameters = call.receiveParameters() val id = parameters[“id"] ?: throw IllegalArgumentException("Missing parameter: id") val action = parameters[“action"] ?: throw IllegalArgumentException("Missing parameter: action") post("/subscriptions") { end post

129. post("/verify") {... }3 } }4 authenticate("userAuth") { get("/subscriptions") { install(FreeMarker)

     { routing { }freemarker ... install(Authentication) {auth }auth ... ... post("/subscriptions") { }post get("/subscriptions") { val parameters = call.receiveParameters() val id = parameters[“id"] ?: throw IllegalArgumentException("Missing parameter: id") val action = parameters[“action"] ?: throw IllegalArgumentException("Missing parameter: action") when (action) { }when post("/subscriptions") { val parameters = call.receiveParameters() ids and such end post

130. post("/verify") {... }3 } }4 authenticate("userAuth") { get("/subscriptions") { install(FreeMarker)

     { routing { }freemarker ... install(Authentication) {auth }auth ... ... post("/subscriptions") { }post get("/subscriptions") { val parameters = call.receiveParameters() val id = parameters[“id"] ?: throw IllegalArgumentException("Missing parameter: id") val action = parameters[“action"] ?: throw IllegalArgumentException("Missing parameter: action") when (action) { }when "delete" -> db.deleteSubscription(id) post("/subscriptions") { val parameters = call.receiveParameters() ids and such end post when (action) { end when

131. post("/verify") {... }3 } }4 authenticate("userAuth") { get("/subscriptions") { install(FreeMarker)

     { routing { }freemarker ... install(Authentication) {auth }auth ... ... post("/subscriptions") { }post get("/subscriptions") { val parameters = call.receiveParameters() val id = parameters[“id"] ?: throw IllegalArgumentException("Missing parameter: id") val action = parameters[“action"] ?: throw IllegalArgumentException("Missing parameter: action") when (action) { }when "delete" -> db.deleteSubscription(id) "cancel" -> { } -> cancel post("/subscriptions") { val parameters = call.receiveParameters() ids and such end post when (action) { “delete” -> db.deleteSubscription(id) end when

132. post("/verify") {... }3 } }4 authenticate("userAuth") { get("/subscriptions") { install(FreeMarker)

     { routing { }freemarker ... install(Authentication) {auth }auth ... ... post("/subscriptions") { }post get("/subscriptions") { val parameters = call.receiveParameters() val id = parameters[“id"] ?: throw IllegalArgumentException("Missing parameter: id") val action = parameters[“action"] ?: throw IllegalArgumentException("Missing parameter: action") when (action) { }when "delete" -> db.deleteSubscription(id) "cancel" -> { db.subscription(id) } -> cancel post("/subscriptions") { val parameters = call.receiveParameters() ids and such end post when (action) { “delete” -> db.deleteSubscription(id) end when

133. post("/verify") {... }3 } }4 authenticate("userAuth") { get("/subscriptions") { install(FreeMarker)

     { routing { }freemarker ... install(Authentication) {auth }auth ... ... post("/subscriptions") { }post get("/subscriptions") { val parameters = call.receiveParameters() val id = parameters[“id"] ?: throw IllegalArgumentException("Missing parameter: id") val action = parameters[“action"] ?: throw IllegalArgumentException("Missing parameter: action") when (action) { }when "delete" -> db.deleteSubscription(id) "cancel" -> { db.subscription(id) db.putSubscription(it.copy(canceled = true)) }db.subscription(id)?.also } -> cancel ?.also { post("/subscriptions") { val parameters = call.receiveParameters() ids and such end post when (action) { “delete” -> db.deleteSubscription(id) end when

134. post("/verify") {... }3 } }4 authenticate("userAuth") { get("/subscriptions") { install(FreeMarker)

     { routing { }freemarker ... install(Authentication) {auth }auth ... ... post("/subscriptions") { val parameters = call.receiveParameters() val id = parameters[“id"] ?: throw IllegalArgumentException("Missing parameter: id") val action = parameters[“action"] ?: throw IllegalArgumentException("Missing parameter: action") when (action) { "delete" -> db.deleteSubscription(id) "cancel" -> { db.subscription(id)?.also { db.putSubscription(it.copy(canceled = true)) }db.subscription(id)?.also } -> cancel }when }post call.respondRedirect("/subscriptions") get("/subscriptions") { post("/subscriptions") { val parameters = call.receiveParameters() ids and such end post when (action) { “delete” -> db.deleteSubscription(id) end when cancel stuff

135. <th class="mdl-data-table__cell--non-numeric">Expiry Date</th> <th class="mdl-data-table__cell--non-numeric">Cancelled</th> </tr> </thead> <tbody> <#list subscriptions

     as subscription> <tr> <td class="mdl-data-table__cell--non-numeric">${subscription.ownerId}</td> <td class="mdl-data-table__cell--non-numeric">${subscription.startDate?date}</td> <td class="mdl-data-table__cell--non-numeric">${subscription.expiryDate?date}</td> <td class="mdl-data-table__cell--non-numeric"> ${subscription.canceled?string('yes', 'no')} </td> </tr> </#list> </tbody> /table> >

136. <td class="mdl-data-table__cell--non-numeric"> ${subscription.canceled?string('yes', 'no')} </td> </tr> </#list> </tbody> <td class="mdl-data-table__cell--non-numeric">

     <form method="post" action="subscriptions"> <input type="hidden" name="id" value="${subscription.id}"/> <input type="hidden" name="action" value="cancel"/> <button type="submit" title="Cancel" class=“…” <#if subscription.canceled>disabled</#if>> <i class="material-icons">block</i> </button> </form> <form method="post" action="subscriptions"> <input type="hidden" name="id" value="${subscription.id}"/> <input type="hidden" name="action" value="delete"/> <button type="submit" title="Delete" class=“…”> <i class="material-icons">delete</i> </button> </form> </td> td /td

137. <td class="mdl-data-table__cell--non-numeric"> ${subscription.canceled?string('yes', 'no')} </td> </tr> </#list> </tbody> <td class="mdl-data-table__cell--non-numeric">

     <form method="post" action="subscriptions"> <input type="hidden" name="id" value="${subscription.id}"/> <input type="hidden" name="action" value="cancel"/> <button type="submit" title="Cancel" class=“…” <#if subscription.canceled>disabled</#if>> <i class="material-icons">block</i> </button> </form> <form method="post" action="subscriptions"> <input type="hidden" name="id" value="${subscription.id}"/> <input type="hidden" name="action" value="delete"/> <button type="submit" title="Delete" class=“…”> <i class="material-icons">delete</i> </button> </form> </td> td /td start td End td

138. <td class="mdl-data-table__cell--non-numeric"> ${subscription.canceled?string('yes', 'no')} </td> </tr> </#list> </tbody> <td class="mdl-data-table__cell--non-numeric">

     <form method="post" action="subscriptions"> <input type="hidden" name="id" value="${subscription.id}"/> <input type="hidden" name="action" value="cancel"/> <button type="submit" title="Cancel" class=“…” <#if subscription.canceled>disabled</#if>> <i class="material-icons">block</i> </button> </form> <form method="post" action="subscriptions"> <input type="hidden" name="id" value="${subscription.id}"/> <input type="hidden" name="action" value="delete"/> <button type="submit" title="Delete" class=“…”> <i class="material-icons">delete</i> </button> </form> </td> td /td start td End td form content

139. <td class="mdl-data-table__cell--non-numeric"> ${subscription.canceled?string('yes', 'no')} </td> </tr> </#list> </tbody> <td class="mdl-data-table__cell--non-numeric">

     <form method="post" action="subscriptions"> <input type="hidden" name="id" value="${subscription.id}"/> <input type="hidden" name="action" value="cancel"/> <button type="submit" title="Cancel" class=“…” <#if subscription.canceled>disabled</#if>> <i class="material-icons">block</i> </button> </form> <form method="post" action="subscriptions"> <input type="hidden" name="id" value="${subscription.id}"/> <input type="hidden" name="action" value="delete"/> <button type="submit" title="Delete" class=“…”> <i class="material-icons">delete</i> </button> </form> </td> td /td start td End td formstart td /form td button

140. <td class="mdl-data-table__cell--non-numeric"> ${subscription.canceled?string('yes', 'no')} </td> </tr> </#list> </tbody> <td class="mdl-data-table__cell--non-numeric">

     <form method="post" action="subscriptions"> <input type="hidden" name="id" value="${subscription.id}"/> <input type="hidden" name="action" value="cancel"/> <button type="submit" title="Cancel" class=“…” <#if subscription.canceled>disabled</#if>> <i class="material-icons">block</i> </button> </form> <form method="post" action="subscriptions"> <input type="hidden" name="id" value="${subscription.id}"/> <input type="hidden" name="action" value="delete"/> <button type="submit" title="Delete" class=“…”> <i class="material-icons">delete</i> </button> </form> </td> td /td start td End td formstart td /form td inputs

141. http://localhost:8080/subscriptions http://localhost:8080/subs… Ryan

142. http://localhost:8080/subscriptions http://localhost:8080/subs… Ryan Cancel

143. http://localhost:8080/subscriptions http://localhost:8080/subs… Ryan

144. Ryan

145. Ryan

146. Ktor • Web • Github • Slack http://ktor.io ktorio /

     ktor kotlinlang #ktor

147. Ktor • Web • Github • Slack • Me http://ktor.io

     ktorio / ktor kotlinlang #ktor @rharter

148. Servers ❤ Kotlin Ryan Harter @rharter