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Servers ❤ Kotlin Ryan Harter @rharter

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Ktor

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Ktor Easy to use, fun and asynchronous.

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Ktor Easy to use, fun and asynchronous. Composable, DSL based web services in Kotlin

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Ktor Application

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Ktor Application Jetty Netty Tomcat Servlet

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Ktor Application Feature Feature Feature Feature Servlet

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Ktor Application Feature Feature Feature Feature Routing HTML Templates Serialization Authentication Servlet

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Ktor

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Ktor Verify

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Ktor Verify Admin

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

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

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

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

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

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

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

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Typed Responses

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

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call.respond(Response(status = "OK")) post("/verify") { routing { fun Application.verify() { } } } data class Response(val status: String)

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

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

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call.respond(Response(status = "OK")) post("/verify") { routing { fun Application.verify() { } } } data class Response(val status: String)

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call.respond(Response(status = "OK")) post("/verify") { routing { fun Application.verify() { } } } data class Response(val status: String) install(StatusPages)

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call.respond(Response(status = "OK")) post("/verify") { routing { fun Application.verify() { } } } data class Response(val status: String) install(StatusPages) { } exception { e -> }

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call.respond(Response(status = "OK")) post("/verify") { routing { fun Application.verify() { } } } data class Response(val status: String) install(StatusPages) { } exception { e -> call.respondText(e.localizedMessage, ContentType.Text.Plain, HttpStatusCode.InternalServerError) }

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call.respond(Response(status = "OK")) post("/verify") { routing { fun Application.verify() { } } } data class Response(val status: String) install(StatusPages) { } exception { e -> call.respondText(e.localizedMessage, ContentType.Text.Plain, HttpStatusCode.InternalServerError) }

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

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→ curl -X POST -d '' http://localhost:8080/verify Cannot transform this request's content to class com.ryanharter.example.Response

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call.respond(Response(status = "OK")) post("/verify") { routing { fun Application.verify() { } } } data class Response(val status: String) install(StatusPages) { } exception { e -> call.respondText(e.localizedMessage, ContentType.Text.Plain, HttpStatusCode.InternalServerError) }

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install(StatusPages) { }1 call.respond(Response(status = "OK")) post("/verify") { routing { fun Application.verify() { } } } data class Response(val status: String) ...

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call.respond(Response(status = "OK")) post("/verify") { routing { fun Application.verify() { } } } data class Response(val status: String) install(ContentNegotiation) ≈ install(StatusPages) { }1 ... ≈

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call.respond(Response(status = "OK")) post("/verify") { routing { fun Application.verify() { } } } data class Response(val status: String) install(ContentNegotiation) ≈ install(StatusPages) { }1 ... ≈ { }2

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call.respond(Response(status = "OK")) post("/verify") { routing { fun Application.verify() { } } } data class Response(val status: String) install(ContentNegotiation) ≈ install(StatusPages) { }1 ... ≈ { }2 moshi() ≈ ≈

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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)

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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)

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

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

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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)

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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) ...

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Typed Requests

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No content

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No content

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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) ...

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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

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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

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@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

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@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() ≈ ≈ bird

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@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() ≈ ≈ call.respond(request) bird

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@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() call.respond(request)

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→

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→ cat << EOF >> /tmp/request.json

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→ cat << EOF >> /tmp/request.json > { > "userId": "rharter", > "packageName": "com.pixite.pigment", > "productId": "com.pixite.pigment.subscription.monthly_t", > "token": “fpljlfogiejllhkebmjkpndm.AO-Oy5r83Kzef5afyMfL0suZM11l76cp_WdnWgOz... > } > EOF →

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→

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→ curl -X POST —H "Content-Type: application/json" -d @/tmp/request.json \ http://localhost:8080/verify

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→ 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..."}

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@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() call.respond(request)

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@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() call.respond(request) ???

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External Components

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@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() call.respond(request) ???

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@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() call.respond(request) // Find valid subscription in db or remotely ≈ ≈

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@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() // Find valid subscription in db or remotely // Save to database ≈ ≈

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// 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() // Find valid subscription in db or remotely // Save to database ≈ ≈

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interface Api { suspend fun findSubscription(userId: String, packageName: String, productId: String, token: String): Subscription? }

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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) } }

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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

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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

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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 }

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// 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() // Find valid subscription in db or remotely // Save to database

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// 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() // Find valid subscription in db or remotely // Save to database ≈ ≈ ≈ val api = TotallyRealApi() ≈ ≈ ≈

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// 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() // Find valid subscription in db or remotely // Save to database ≈ ≈ ≈ val db = InMemoryDatabase() val api = TotallyRealApi() ≈ ≈ ≈

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// 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() // Save to database ≈ ≈ ≈ val db = InMemoryDatabase() val api = TotallyRealApi() ≈ ≈ val subscription = db.subscriptionByUserId(request.userId)

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// 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() ≈ ≈ val db = InMemoryDatabase() val api = TotallyRealApi() ≈ ?: api.findSubscription(request.userId, request.packageName request.productId, request.token) val subscription = db.subscriptionByUserId(request.userId)

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?: 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() ≈ ≈ val db = InMemoryDatabase() val api = TotallyRealApi() ≈ ?.also { db.createSubscription(it) } val subscription = db.subscriptionByUserId(request.userId)

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post("/verify") { routing { fun Application.verify() { } } install(ContentNegotiation) install(StatusPages) { }1 ... { }2 ... val request = call.receive() ≈ ≈ 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) }

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

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→ 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"}

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→ 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

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→ 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. →

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Templates

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post("/verify") { routing { fun Application.verify() { } } install(ContentNegotiation) install(StatusPages) { }1 ... { }2 ... val request = call.receive() 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) }

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post("/verify") { routing { fun Application.verify() { } } install(ContentNegotiation) install(StatusPages) { }1 ... { }2 ... ... }3 ...

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get(“/subscriptions") { routing { fun Application.verify() { } } install(ContentNegotiation) install(StatusPages) { }1 ... { }2 ... }4 ... post("/verify") {... }3

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get(“/subscriptions") { routing { fun Application.verify() { } } install(ContentNegotiation) install(StatusPages) { }1 ... { }2 ... }4 ... post("/verify") {... }3 val subscriptions = db.subscriptions() call.respond(subscriptions)

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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…

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get(“/subscriptions") { routing { fun Application.verify() { } } install(ContentNegotiation) install(StatusPages) { }1 ... { }2 ... }4 ... post("/verify") {... }3 val subscriptions = db.subscriptions() call.respond(subscriptions)

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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

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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( [email protected], "templates" )

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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 ...

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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

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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

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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

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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

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<#list subscriptions as subscription> Owner ID Start Date Expiry Date Cancelled ${subscription.ownerId} ${subscription.startDate?date} ${subscription.expiryDate?date} ${subscription.canceled?string('yes', 'no')}

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Start Date Expiry Date Cancelled <#list subscriptions as subscription> ${subscription.ownerId} ${subscription.startDate?date} ${subscription.expiryDate?date} ${subscription.canceled?string('yes', 'no')} /table> >

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[ { "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…

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[ { "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…

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

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Authentication

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}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

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}routing install(FreeMarker) { get("/subscriptions") { routing { fun Application.verify() { install(ContentNegotiation) install(StatusPages) { }1 ... { }2 ... }freemarker ... } }4 post("/verify") {... }3 ...

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}routing install(FreeMarker) { get("/subscriptions") { routing { fun Application.verify() { install(ContentNegotiation) install(StatusPages) { }1 ... { }2 ... }freemarker ... } }4 post("/verify") {... }3 ... install(Authentication) s

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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

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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

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}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

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}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

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}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 ...

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}routing install(FreeMarker) { get("/subscriptions") { routing { fun Application.verify() { install(ContentNegotiation) install(StatusPages) { }1 ... { }2 ... }freemarker ... } }4 post("/verify") {... }3 ... install(Authentication) {auth }auth ...

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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 ...

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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 ...

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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 ...

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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 ...

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} 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 ...

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[ { "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…

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

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http://localhost:8080/subscriptions http://localhost:8080/subs… Sign in http://localhost:8080 Username Password Sign in Cancel admin •••••••••••

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

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Forms

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

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

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Ryan

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} } 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 ... ...

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post("/verify") {... }3 } }4 authenticate("userAuth") { get("/subscriptions") { install(FreeMarker) { routing { }freemarker ... install(Authentication) {auth }auth ... ... post("/subscriptions") { }post get("/subscriptions") {

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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()

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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

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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

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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

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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

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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

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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

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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

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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

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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

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Expiry Date Cancelled <#list subscriptions as subscription> ${subscription.ownerId} ${subscription.startDate?date} ${subscription.expiryDate?date} ${subscription.canceled?string('yes', 'no')} /table> >

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${subscription.canceled?string('yes', 'no')} disabled> block delete td /td

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${subscription.canceled?string('yes', 'no')} disabled> block delete td /td start td End td

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${subscription.canceled?string('yes', 'no')} disabled> block delete td /td start td End td form content

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${subscription.canceled?string('yes', 'no')} disabled> block delete td /td start td End td formstart td /form td button

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${subscription.canceled?string('yes', 'no')} disabled> block delete td /td start td End td formstart td /form td inputs

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

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

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

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Ryan

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Ryan

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

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Ktor • Web • Github • Slack • Me http://ktor.io ktorio / ktor kotlinlang #ktor @rharter

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Servers ❤ Kotlin Ryan Harter @rharter