kotlin-ktor

name	kotlin-ktor
description	Ktor framework - routing, authentication, WebSockets
version	1.0.0
sasmp_version	1.3.0
bonded_agent	05-kotlin-backend
bond_type	PRIMARY_BOND
execution	{"timeout_ms":30000,"retry":{"max_attempts":3,"backoff":"exponential","initial_delay_ms":1000}}
parameters	{"required":[{"name":"topic","type":"string","validation":"^(routing|plugins|auth|websocket|testing)$"}],"optional":[{"name":"ktor_version","type":"string","default":"2.3.8"}]}
logging	{"level":"info","events":["skill_invoked","topic_loaded","error_occurred"]}

Kotlin Ktor Skill

Build production-ready backends with Ktor.

Topics Covered

Routing

fun Application.module() {
    install(ContentNegotiation) { json() }
    routing {
        route("/api/v1") {
            get("/users") { call.respond(userService.findAll()) }
            get("/users/{id}") {
                val id = call.parameters["id"]?.toLongOrNull()
                    ?: throw BadRequestException("Invalid ID")
                call.respond(userService.findById(id) ?: throw NotFoundException())
            }
        }
    }
}

JWT Authentication

install(Authentication) {
    jwt("auth") {
        verifier(JWT.require(Algorithm.HMAC256(secret)).build())
        validate { credential ->
            if (credential.payload.getClaim("userId").asString().isNotEmpty())
                UserPrincipal(credential.payload)
            else null
        }
    }
}

authenticate("auth") { userRoutes() }

Testing

@Test
fun `GET users returns list`() = testApplication {
    application { module() }
    client.get("/api/v1/users").apply {
        assertThat(status).isEqualTo(HttpStatusCode.OK)
    }
}

Troubleshooting

Issue	Resolution
404 for valid route	Order specific routes before wildcards
JSON not parsed	Install ContentNegotiation plugin

Usage

Skill("kotlin-ktor")