From 6f3a6e8839e1e9418d82d643120b93184ef7a45b Mon Sep 17 00:00:00 2001
From: Fabian Bull <spam+github@fbull.de>
Date: Mon, 4 Jul 2022 21:34:00 +0200
Subject: [PATCH] Prototype typesafe config

---
 server/build.sbt                                   |  5 +++++
 server/src/main/resources/application.conf         |  1 +
 .../org/openschool/server/BackendServer.scala      | 14 +++++++++++---
 3 files changed, 17 insertions(+), 3 deletions(-)
 create mode 100644 server/src/main/resources/application.conf

diff --git a/server/build.sbt b/server/build.sbt
index 899dfe3..98ca968 100644
--- a/server/build.sbt
+++ b/server/build.sbt
@@ -12,17 +12,22 @@ lazy val server = (project in file("."))
     scalaVersion := "3.1.0",
     assembly / mainClass := Some("org.openschool.server.Main"),
     libraryDependencies ++= Seq(
+      "com.typesafe" % "config" % "1.4.2",
+
       "org.http4s" %% "http4s-ember-server" % Http4sVersion,
       "org.http4s" %% "http4s-ember-client" % Http4sVersion,
       "org.http4s" %% "http4s-circe" % Http4sVersion,
       "io.circe" %% "circe-generic" % "0.14.1",
+
       "org.http4s" %% "http4s-dsl" % Http4sVersion,
       "com.softwaremill.sttp.tapir" %% "tapir-core" % TapirVersion,
       "com.softwaremill.sttp.tapir" %% "tapir-json-circe" % TapirVersion,
       "com.softwaremill.sttp.tapir" %% "tapir-http4s-server" % TapirVersion,
       "com.softwaremill.sttp.tapir" %% "tapir-swagger-ui-bundle" % TapirVersion,
+
       "org.scalameta" %% "munit" % MunitVersion % Test,
       "org.typelevel" %% "munit-cats-effect-3" % MunitCatsEffectVersion % Test,
+
       "ch.qos.logback" % "logback-classic" % LogbackVersion
     ),
     testFrameworks += new TestFramework("munit.Framework")
diff --git a/server/src/main/resources/application.conf b/server/src/main/resources/application.conf
new file mode 100644
index 0000000..2bc054a
--- /dev/null
+++ b/server/src/main/resources/application.conf
@@ -0,0 +1 @@
+port = 8080
diff --git a/server/src/main/scala/org/openschool/server/BackendServer.scala b/server/src/main/scala/org/openschool/server/BackendServer.scala
index ac8eafe..c520fae 100644
--- a/server/src/main/scala/org/openschool/server/BackendServer.scala
+++ b/server/src/main/scala/org/openschool/server/BackendServer.scala
@@ -1,5 +1,8 @@
 package org.openschool.server
 
+import cats.Applicative
+import com.typesafe.config.Config
+import com.typesafe.config.ConfigFactory
 import cats.effect.{Async, Resource}
 import cats.syntax.all._
 import com.comcast.ip4s._
@@ -14,8 +17,13 @@ import org.http4s.Uri
 
 object BackendServer:
 
+  def config[F[_]: Applicative]: Resource[F, Config] = 
+    Resource.pure(ConfigFactory.load())
+
   def stream[F[_]: Async]: Stream[F, Nothing] = {
     for {
+      config <- Stream.resource(config[F])
+      port = config.getInt("port")
       client <- Stream.resource(EmberClientBuilder.default[F].build)
       helloWorldAlg = HelloWorld.impl[F]
       systemInfoAlg = SystemInfo.impl[F]
@@ -25,8 +33,8 @@ object BackendServer:
       corsOriginSettings = CORS.policy
         .withAllowOriginHost(
           Set(
-            Origin.Host(Uri.Scheme.https, Uri.RegName("localhost"), 8000.some),
-            Origin.Host(Uri.Scheme.http, Uri.RegName("localhost"), 8000.some)
+            Origin.Host(Uri.Scheme.https, Uri.RegName("localhost"), port.some),
+            Origin.Host(Uri.Scheme.http, Uri.RegName("localhost"), port.some)
           )
         )
         .withAllowCredentials(false)
@@ -50,7 +58,7 @@ object BackendServer:
         EmberServerBuilder
           .default[F]
           .withHost(ipv4"0.0.0.0")
-          .withPort(port"8080")
+          .withPort(Port.fromInt(port).get)
           .withHttpApp(finalHttpApp)
           .build >>
           Resource.eval(Async[F].never)