Allow authenticating via custom HTTP headers

modules/lm-coursier/src/main/scala/lmcoursier/CoursierConfiguration.scala

@@ -75,6 +75,8 @@ import scala.concurrent.duration.Duration
     withStrict(Some(strict))
   def withTtl(ttl: Duration): CoursierConfiguration =
     withTtl(Some(ttl))
+  def addRepositoryAuthentication(repositoryId: String, authentication: Authentication): CoursierConfiguration =
+    withAuthenticationByRepositoryId(authenticationByRepositoryId :+ (repositoryId, authentication))
 }
 
 object CoursierConfiguration {

modules/lm-coursier/src/main/scala/lmcoursier/definitions/Authentication.scala

@@ -1,15 +1,28 @@
 package lmcoursier.definitions
 
-import dataclass.data
+import dataclass._
 
 @data class Authentication(
   user: String,
   password: String,
   optional: Boolean = false,
-  realmOpt: Option[String] = None
+  realmOpt: Option[String] = None,
+  @since
+  headers: Seq[(String,String)] = Nil
 ) {
   override def toString(): String =
     withPassword("****")
+      .withHeaders(
+        headers.map {
+          case (k, v) => (k, "****")
+        }
+      )
       .productIterator
       .mkString("Authentication(", ", ", ")")
 }
+
+object Authentication {
+
+  def apply(headers: Seq[(String, String)]): Authentication =
+    Authentication("", "", optional = false, None, headers)
+}

modules/lm-coursier/src/main/scala/lmcoursier/definitions/ToCoursier.scala

@@ -27,6 +27,7 @@ object ToCoursier {
     coursier.core.Authentication(authentication.user, authentication.password)
       .withOptional(authentication.optional)
       .withRealmOpt(authentication.realmOpt)
+      .withHttpHeaders(authentication.headers)
 
   def module(module: Module): coursier.core.Module =
     coursier.core.Module(