Accessing routing path string within request in Ktor

Question

Does the Ktor framework provide a way of accessing a route's path string within a request?

For example, if I set up a route such as:

routing {
    get("/user/{user_id}") {
        // possible to get the string "/user/{user_id}" here?
    } 
}

To clarify, I'm looking for a way to access the unprocessed path string, i.e. "/user/{user_id}" in this case (accessing the path via call.request.path() gives me the path after the {user_id} has been filled in, e.g. "/user/123").

I can of course assign the path to a variable and pass it to both get and use it within the function body, but wondering if there's a way of getting at the route's path without doing that.

Answer 1

I solved it like this

// Application.kt

private object Paths {
    const val LOGIN = "/login"
    ...
}

fun Application.module(testing: Boolean = false) {
    ...
    routing {
       loginGet(Paths.LOGIN)
    }
}

And to structure my extension functions, I put them in other files like this

// Auth.kt

fun Route.loginGet(path: String) = get(path) {
    println("The path is: $path")
}

Answer 2

It is indeed possible and very simple.

when you try to access/[GET] URL: /users/7

you should get the full path -> "users/7"

    routing {
        get("/users/{user_id}") {
                val userPath = call.request.path() // This should be your solution // Note: userPath holds "users/7"
                call.respond(userPath)
              }
            }

Answer 3

fun Route.fullPath(): String {
        val parentPath = parent?.fullPath()?.let { if (it.endsWith("/")) it else "$it/" } ?: "/"

        return when (selector) {
            is TrailingSlashRouteSelector,
            is AuthenticationRouteSelector -> parentPath
            else -> parentPath + selector.toString()
        }
    }

Answer 4

I found a solution for this problem

val uri = "foos/foo"

get("$uri/{foo_id}") {
    val path = call.request.path()
    val firstPart = path.length
    val secondPart = path.slice((firstPart+1) until path.length)
  
    call.respondText("$secondPart")
}

try this code it's simple and robust