Add support for relocation

core/shared/src/main/scala/coursier/maven/MavenRepository.scala

@@ -249,7 +249,7 @@ final case class MavenRepository(
       for {
         xml <- \/.fromEither(compatibility.xmlParse(str))
         _ <- if (xml.label == "project") \/-(()) else -\/("Project definition not found")
-        proj <- Pom.project(xml)
+        proj <- Pom.project(xml, relocationAsDependency = true)
       } yield proj
 
     def artifactFor(url: String) =

core/shared/src/main/scala/coursier/maven/Pom.scala

@@ -140,7 +140,13 @@ object Pom {
   def packagingOpt(pom: Node): Option[String] =
     text(pom, "packaging", "").toOption
 
-  def project(pom: Node): String \/ Project = {
+  def project(pom: Node): String \/ Project =
+    project(pom, relocationAsDependency = false)
+
+  def project(
+    pom: Node,
+    relocationAsDependency: Boolean
+  ): String \/ Project = {
     import Scalaz._
 
     for {
@@ -242,10 +248,41 @@ object Pom {
           case \/-(d) => d
         }
 
+      val finalProjModule = projModule.copy(organization = groupId)
+
+      val relocationDependencyOpt =
+        if (relocationAsDependency)
+          pom.children
+            .find(_.label == "distributionManagement")
+            .flatMap(_.children.find(_.label == "relocation"))
+            .map { n =>
+
+              // see https://maven.apache.org/guides/mini/guide-relocation.html
+
+              val relocatedGroupId = text(n, "groupId", "").getOrElse(finalProjModule.organization)
+              val relocatedArtifactId = text(n, "artifactId", "").getOrElse(finalProjModule.name)
+              val relocatedVersion = text(n, "version", "").getOrElse(version)
+
+              "" -> Dependency(
+                finalProjModule.copy(
+                  organization = relocatedGroupId,
+                  name = relocatedArtifactId
+                ),
+                relocatedVersion,
+                "",
+                Set(),
+                Attributes("", ""),
+                optional = false,
+                transitive = true
+              )
+            }
+        else
+          None
+
       Project(
-        projModule.copy(organization = groupId),
+        finalProjModule,
         version,
-        deps.map {
+        (relocationDependencyOpt.toList ::: deps).map {
           case (config, dep0) =>
             val dep = extraAttrsMap.get(dep0.moduleVersion).fold(dep0)(attrs =>
               dep0.copy(module = dep0.module.copy(attributes = attrs))

tests/shared/src/test/resources/resolutions/bouncycastle/bctsp-jdk14/138

@@ -0,0 +1,4 @@
+bouncycastle:bctsp-jdk14:138:compile
+org.bouncycastle:bcmail-jdk14:1.38:compile
+org.bouncycastle:bcprov-jdk14:1.38:compile
+org.bouncycastle:bctsp-jdk14:1.38:compile

tests/shared/src/test/scala/coursier/test/CentralTests.scala

@@ -586,6 +586,13 @@ object CentralTests extends TestSuite {
         "0.9.19"
       )
     }
+
+    'relocation - {
+      resolutionCheck(
+        Module("bouncycastle", "bctsp-jdk14"),
+        "138"
+      )
+    }
   }
 
 }