ZIO learning - http client using synchronous sttp with proxy support / published by https://github.com/dacr/code-examples-manager #6756aa6d-6d0e-4a87-87b1-b69cbc528917/cf06c4da352c911364bae3de17173a4891c0aef5

zio-learning-sttp-client-proxy.sc

// summary : ZIO learning - http client using synchronous sttp with proxy support
// keywords : scala, zio, learning, pure-functional, sttp, http-proxy, proxy, @testable
// publish : gist
// authors : David Crosson
// license : Apache License Version 2.0 (https://www.apache.org/licenses/LICENSE-2.0.txt)
// id : 6756aa6d-6d0e-4a87-87b1-b69cbc528917
// created-on : 2022-01-23T11:36:49+01:00
// managed-by : https://github.com/dacr/code-examples-manager
// run-with : scala-cli $file

// ---------------------
//> using scala "3.4.2"
//> using dep "dev.zio::zio:2.0.13"
//> using dep "com.softwaremill.sttp.client3::async-http-client-backend-zio:3.8.15"
//> using dep "org.slf4j:slf4j-nop:2.0.7"
// ---------------------

import zio.*
import sttp.client3.*
import sttp.client3.SttpBackendOptions.ProxyType
import sttp.client3.asynchttpclient.zio.*

case class HttpProxyConfig(host: String, port: Int, nonProxyHosts: List[String])

object HttpProxyConfig {
  def fromPropOrEnv(): Option[HttpProxyConfig] =
    import scala.util.Properties.{propOrNone, envOrNone}
    val keys = LazyList("http_proxy", "https_proxy")
    keys.flatMap { key =>
      propOrNone(key).orElse(envOrNone(key)).flatMap(fromProvidedString)
    }.headOption

  def fromProvidedString(spec: String): Option[HttpProxyConfig] =
    val nonProxyHosts = scala.util.Properties.envOrElse("no_proxy", "").split(",\\s*").toList.map(_.trim)
    val extractor     = """^https?://([^:/]+)(?::(\d+))?/?$""".r
    extractor.findFirstIn(spec.trim.toLowerCase()).collect {
      case extractor(host, null) => HttpProxyConfig(host, 80, nonProxyHosts)
      case extractor(host, port) => HttpProxyConfig(host, port.toInt, nonProxyHosts)
    }
}

def makeProxyConfig(config: HttpProxyConfig): SttpBackendOptions =
  import scala.concurrent.duration.*
  val proxy = SttpBackendOptions.Proxy(config.host, config.port, proxyType = ProxyType.Http, nonProxyHosts = config.nonProxyHosts)
  SttpBackendOptions(connectionTimeout = 5.seconds, Some(proxy))

// ---------------------------------------------------------------------------

object Encapsulated extends ZIOAppDefault {

  val sttpBackend =
    import scala.concurrent.duration.*
    val options =
      HttpProxyConfig
        .fromPropOrEnv()
        .map(makeProxyConfig)
        .getOrElse(SttpBackendOptions.Default)
        .connectionTimeout(5.seconds)
    AsyncHttpClientZioBackend.scoped(options)

  override def run = for {
      backend <- sttpBackend
      result  <- backend.send(basicRequest.get(uri"https://mapland.fr/clientInfo").response(asStringAlways))
      _       <- Console.printLine(result.body)
    } yield ()

}

Encapsulated.main(Array.empty)