override fun install()

in ktor-server/ktor-server-core/jvm/src/io/ktor/features/OriginConnectionPoint.kt [90:138]
43 lines of code
3 McCabe index (conditional complexity)

    override fun install(pipeline: ApplicationCallPipeline, configure: Config.() -> Unit): Config {
        val config = Config()
        configure(config)

        pipeline.intercept(ApplicationCallPipeline.Features) {
            call.forEachHeader(config.protoHeaders) { value ->
                call.mutableOriginConnectionPoint.let { route ->
                    route.scheme = value
                    URLProtocol.byName[value]?.let {
                        route.port = it.defaultPort
                    }
                }
            }

            call.forEachHeader(config.httpsFlagHeaders) { value ->
                if (value.toBoolean()) {
                    call.mutableOriginConnectionPoint.let { route ->
                        route.scheme = "https"
                        URLProtocol.byName[route.scheme]?.let {
                            route.port = it.defaultPort
                        }
                    }
                }
            }

            call.forEachHeader(config.hostHeaders) { value ->
                val host = value.substringBefore(':')
                val port = value.substringAfter(':', "")

                call.mutableOriginConnectionPoint.let { route ->
                    route.host = host
                    port.tryParseInt()?.let {
                        route.port = it
                    } ?: URLProtocol.byName[route.scheme]?.let {
                        route.port = it.defaultPort
                    }
                }
            }

            call.forEachHeader(config.forHeaders) { xForwardedFor ->
                val remoteHost = xForwardedFor.split(",").first().trim()
                if (remoteHost.isNotBlank()) {
                    call.mutableOriginConnectionPoint.remoteHost = remoteHost
                }
            }
        }

        return config
    }