kotlinlang #ktor

Hi all, I've been working on a project where I'm using ktor and I'm implementing Oauth. I've implemented my own login system in the back of it and I'm using [ory/hydra](https://github.com/ory/hydra) as an oauth flow manager. My problem is that I've followed the Oauth implementation [tutorials](https://ktor.io/features/authentication/oauth.html) and have read the whole code for the Google Oauth example, but my principal from

call.authentication.principal

is always null and I don't know where to start in debugging it...

kluck

07/31/2018, 8:54 AM

Hello, I'm trying to authenticate via Active Directory using

ldapAuthenticate

, but I don't understand how I can use my "manager" binding along with a user search. In ktor, there seems to be only a

userDNFormat

String to configure the lookup. What am I doing wrong?

📝 1

✅ 1

tipsy

08/01/2018, 12:05 AM

i don't really know ktor, but you could solve it by extracting the lambda to a function?

get("/", ::dualHandler)
post("/", ::dualHandler)

☝️ 1

dave08

08/01/2018, 7:32 AM

Can I use the Ktor client to receive a file with a simple

get

📝 1

✅ 1

08/02/2018, 8:09 AM

📣

0.9.4-alpha-2

has been published with experimental multiplatform (MPP) HTTP client (android + ios) support. See the reply for details. ❗ This is pre-release version

🎉 14

Matt

08/02/2018, 8:56 AM

val UnsupportedMediaType = HttpStatusCode(415, "Unsupported Media Type")
        val RequestedRangeNotSatisfiable = HttpStatusCode(416, "Requested Range Not Satisfiable")
        val ExceptionFailed = HttpStatusCode(417, "Exception Failed")
        val UpgradeRequired = HttpStatusCode(426, "Upgrade Required")
        val TooManyRequests = HttpStatusCode(429, "Too Many Requests")
        val RequestHeaderFieldTooLarge = HttpStatusCode(431, "Request Header Fields Too Large")

I was wanting to use "422 Unprocessable Entity", but there isn't a constant for it in

io.ktor.http.HttpStatusCode

yet. Is it a case of "PRs welcome", or is there a deliberate reason not to include certain codes?

Matt

08/02/2018, 7:01 PM

I guess this might do the job:

get("*") {
            call.respond(HttpStatusCode.NotFound, etc)
        }

Only matches if there is no more specific route, if I understand it correctly?

bdawg.io

08/02/2018, 10:14 PM

Does ktor come with a mechanism for properly building

application/x-www-form-urlencoded

strings from a map?

✅ 1

📝 1

bdawg.io

08/02/2018, 10:15 PM

I see that Parameters can be received from the

request

, but I’m trying to build and write them as a

respond

enleur

08/03/2018, 2:48 PM

Is there any way to catch blocking code on Netty/CommonPool?

bdawg.io

08/03/2018, 9:16 PM

inline fun <T> T.scope(block: T.() -> Unit) {
    block()
}

it’s `T.run`/`T.apply` without a return value Edit: moved examples to thread to clean up channel feed Edit: renamed extension function from
unit
to
scope

👍 1

Hamza

08/04/2018, 12:11 AM

is there anything on the install function and the list of “plugins” available? I want to read up on them

Deactivated User

08/07/2018, 12:27 AM

📣 New Ktor Blog: https://ktor.io/blog

🎉 8

hallvard

08/07/2018, 6:16 AM

Cool, @Deactivated User. But maybe you should change the title? Or is «Blog Template for Bootstrap» meant to be adequate?

vincent.brule

08/07/2018, 11:11 AM

Ok perfect, thank for your answers ! Do you think it’s possible to build my react project in the gradle build in ktor ?

✅ 1

Nikky

08/07/2018, 11:55 PM

actually thats what i ended up doing.. not sure how well this will work..

launch {
        while(true) {
           //do Work
            <http://log.info|log.info>("work complete")
            delay(4, TimeUnit.HOURS)
        }
    }

Hamza

08/08/2018, 2:15 AM

Any stuff on using ktor with native? No idea where to start

dave08

08/08/2018, 6:26 AM

Is there any reason why IDEA expression evaluator doesn't see

call

this

inside a Ktor route? Any workaround?

Albert

08/08/2018, 8:41 AM

I am trying to enable debug logging with Ktor but witout success. It stays on info:

embeddedServer(Netty, 8080) {
        install(CallLogging) {
            level = Level.DEBUG
        }
        routing {
            get("/") {
                println(log.isDebugEnabled)
            }
       }
}.start(wait = true)

log.isDebugEnabled is always returning

false

. Should

install

be invoked somewhere else? can't really find this in the documentation

dave08

08/08/2018, 9:27 AM

Is there an easy way to choose which logback.xml to use depending on Ktor Hocon configs or env. vars?

nbdam

08/08/2018, 4:04 PM

how to load setup from application.conf when using embeddedServer ?

zpearce

08/08/2018, 4:35 PM

hey, ktor noob here. I'm thinking about adding a custom feature that will validate rest api dtos. I've read about pipelines and interceptors, but what I'm unclear on is the fact that this feature would be pretty dependent on coming after the content negotiation feature, since that's when deserialization happens. so two questions: 1) how do I make sure my interceptor happens at the correct time and 2) are there problems with receiving the request body twice (i.e. is there a stream involved somewhere that would need to be reset?)

Hamza

08/09/2018, 5:08 AM

Can someone please give me a more beginner oriented explanation for CORS? I read up on it and watched some stuff but I just don't get it :*

vonox7

08/09/2018, 3:45 PM

Because 1 / 2 = 0, and we need at least one thread

Mohit Gurumukhani

08/09/2018, 6:26 PM

The latest update has android and ios clients for version 0.9.4-alpha-2. However, jvm client is available only in version 0.9.0-alpha-1. Is there a plan to support jvm version in the future?

nbdam

08/10/2018, 11:48 AM

ApplicationCall.respondBytes takes a single ByteArray. Is it possible to do 'vector' write by providing multiple array which should be written. I am trying to avoid buffer copying...

📝 1

✅ 1

Albert

08/10/2018, 1:45 PM

Anyone knows an OpenID (or OAuth2) provider (server) implementation/module for ktor? It seems if I want to use one now I always need a seperate service build in Spring Boot or Vert.X to accomplish this.

Antero Duarte

08/10/2018, 2:03 PM

Hi there, I'm using ktor with the apache async http client, and I'm sending some POST requests to a server that kept failing because they said the body was empty. After enabling debug logging, I can see the http client is sending the request in this format:

DEBUG org.apache.http.wire - http-outgoing-0 >> "POST /the/endpoint HTTP/1.1[\r][\n]"
DEBUG org.apache.http.wire - http-outgoing-0 >> "Content-Type: x-www-form-urlencoded[\r][\n]"
DEBUG org.apache.http.wire - http-outgoing-0 >> "Accept: */*[\r][\n]"
DEBUG org.apache.http.wire - http-outgoing-0 >> "Content-Length: 201[\r][\n]"
DEBUG org.apache.http.wire - http-outgoing-0 >> "Host: localhost:8888[\r][\n]"
DEBUG org.apache.http.wire - http-outgoing-0 >> "Connection: Keep-Alive[\r][\n]"
DEBUG org.apache.http.wire - http-outgoing-0 >> "User-Agent: Apache-HttpAsyncClient/4.1.3 (Java/1.8.0_172)[\r][\n]"
DEBUG org.apache.http.wire - http-outgoing-0 >> "[\r][\n]"
DEBUG org.apache.http.wire - http-outgoing-0 >> "url_encoded=form_params&which_are=fine"

Everything seems fine, but for some reason, the client is prepending a line before the form body, with just

\r\n

, which for some reason is tripping the server on the other end. I don't control the server I'm sending the request to, I don't know if an empty line before the body conforms to the HTTP Spec, but my question is, is there any way to avoid it? For completeness sake, the way I'm creating the request is as follows:

ApacheHttpClient.request<HttpResponse> {
                        method = <http://HttpMethod.Post|HttpMethod.Post>
                        url { takeFrom("<http://some.url/the/endpoint>") }
                        headers.append("Content-Type", ContentType.Application.FormUrlEncoded.contentSubtype)
                        this.body = body.formUrlEncode()
                    }

body is a

List<Pair<String,String>>

and

.formUrlEncode

is the extension method from ktor HttpUrlEncode.kt

08/10/2018, 2:04 PM

Isn't the extra

\r\n

what separates headers from the body?

:yes: 1

Yuri

08/10/2018, 9:05 PM

@orangy yes, thanks. Any plans to add such

ContentConverter

as maven artifact similar to jackson one in the future?

Title

Yuri

08/10/2018, 9:05 PM

@orangy yes, thanks. Any plans to add such

ContentConverter

as maven artifact similar to jackson one in the future?

orangy

08/10/2018, 9:08 PM

Is there any evidence that protobuf is frequently used like this?

Yuri

08/10/2018, 9:24 PM

like serialization format for client-server communication without using grpc?

orangy

08/10/2018, 9:44 PM

Nope, as a content type format for direct web requests. As far as I understand, it’s mostly used for some longer running connections, like Web Sockets or direct TCP connection, but I may be missing some important use case.

Yuri

08/10/2018, 10:18 PM

It is quite common usecase to migrate from Json to Proto in mobile projects in case of large amount of small objects passing to requests/responses. The reasons are simple - improved parsing performance, lower CPU usage than gson/jackson, fixed protocol, api versioning etc.

For example Retrofit (popular Android networking library) supported Proto3 converter more than a year ago

So it would be nice to be able to use (kotlin + retrofit + protobuf) on client side and (ktor + protobuf) on server side out of the box

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