Rework the Scaladex API

`GET  /api/projects` to get the lists of all project references, except the ones that are moved or deleted on Github.
`GET /api/projects/<org>/<repo>/artifacts` to get the lists of artifact refs of a project.
`GET /api/artifacts/<groupid>/<artifactid>/<version>` to get some info about an artifact (language, platform, licenses, release date etc).

There are no filter anymore. Later we can (re-)introduce the `language` and `platform` filters.
There is no pagination and I don't plan on working on it.

build.sbt

@@ -200,7 +200,6 @@ lazy val core = crossProject(JSPlatform, JVMPlatform)
       "io.github.cquiroz" %%% "scala-java-time" % "2.5.0",
       "com.typesafe.play" %%% "play-json" % V.playJson,
       "org.endpoints4s" %%% "algebra" % "1.11.1",
-      "org.endpoints4s" %% "json-schema-playjson" % "1.11.1" % Test,
       "org.scalatest" %%% "scalatest" % V.scalatest % Test,
       "org.jsoup" % "jsoup" % "1.17.2"
     ) ++ Seq(

modules/core/shared/src/main/scala/scaladex/core/api/ArtifactResponse.scala

@@ -0,0 +1,36 @@
+package scaladex.core.api
+
+import java.time.Instant
+
+import scaladex.core.model.Artifact
+import scaladex.core.model.Language
+import scaladex.core.model.License
+import scaladex.core.model.Platform
+import scaladex.core.model.Project
+import scaladex.core.model.SemanticVersion
+
+final case class ArtifactResponse(
+    groupId: Artifact.GroupId,
+    artifactId: String,
+    version: SemanticVersion,
+    artifactName: Artifact.Name,
+    project: Project.Reference,
+    releaseDate: Instant,
+    licenses: Seq[License],
+    language: Language,
+    platform: Platform
+)
+
+object ArtifactResponse {
+  def apply(artifact: Artifact): ArtifactResponse = ArtifactResponse(
+    artifact.groupId,
+    artifact.artifactId,
+    artifact.version,
+    artifact.artifactName,
+    artifact.projectRef,
+    artifact.releaseDate,
+    artifact.licenses.toSeq,
+    artifact.language,
+    artifact.platform
+  )
+}

modules/core/shared/src/main/scala/scaladex/core/api/AutocompletionParams.scala

@@ -7,11 +7,11 @@ import scaladex.core.model.search.Sorting
 
 case class AutocompletionParams(
     query: String,
-    you: Boolean,
     topics: Seq[String],
     languages: Seq[String],
     platforms: Seq[String],
-    contributingSearch: Boolean
+    contributingSearch: Boolean,
+    you: Boolean
 ) {
   def withUser(user: Option[UserState]): SearchParams = {
     val userRepos = if (you) user.map(_.repos).getOrElse(Set.empty) else Set.empty[Project.Reference]

modules/core/shared/src/main/scala/scaladex/core/api/Endpoints.scala

@@ -0,0 +1,61 @@
+package scaladex.core.api
+
+import scaladex.core.model.Artifact
+import scaladex.core.model.Project
+
+trait Endpoints
+    extends JsonSchemas
+    with endpoints4s.algebra.Endpoints
+    with endpoints4s.algebra.JsonEntitiesFromSchemas {
+
+  private val projectPath: Path[Project.Reference] =
+    (segment[String]("organization") / segment[String]("repository"))
+      .xmap { case (org, repo) => Project.Reference.from(org, repo) }(ref =>
+        (ref.organization.value, ref.repository.value)
+      )
+
+  private val artifactPath: Path[Artifact.MavenReference] =
+    (segment[String]("groupId") / segment[String]("artifactId") / segment[String]("version"))
+      .xmap { case (groupId, artifactId, version) => Artifact.MavenReference(groupId, artifactId, version) }(ref =>
+        (ref.groupId, ref.artifactId, ref.version)
+      )
+
+  private val autocompletionQueryString: QueryString[AutocompletionParams] = (
+    qs[String]("q", docs = Some("Main query (e.g., 'json', 'testing', etc.)")) &
+      qs[Seq[String]]("topics", docs = Some("Filter on Github topics")) &
+      qs[Seq[String]](
+        "languages",
+        docs = Some("Filter on language versions (e.g., '3', '2.13', '2.12', '2.11', 'java')")
+      ) &
+      qs[Seq[String]](
+        "platforms",
+        docs = Some("Filter on runtime platforms (e.g., 'jvm', 'sjs1', 'native0.4', 'sbt1.0')")
+      ) &
+      qs[Option[Boolean]]("contributingSearch").xmap(_.getOrElse(false))(Option.when(_)(true)) &
+      qs[Option[String]]("you", docs = Some("internal usage")).xmap[Boolean](_.contains("✓"))(Option.when(_)("✓"))
+  ).xmap((AutocompletionParams.apply _).tupled)(Function.unlift(AutocompletionParams.unapply))
+
+  val listProjects: Endpoint[Unit, Seq[Project.Reference]] =
+    endpoint(
+      get(path / "api" / "projects"),
+      ok(jsonResponse[Seq[Project.Reference]])
+    )
+
+  val listProjectArtifacts: Endpoint[Project.Reference, Seq[Artifact.MavenReference]] =
+    endpoint(
+      get(path / "api" / "projects" / projectPath / "artifacts"),
+      ok(jsonResponse[Seq[Artifact.MavenReference]])
+    )
+
+  val getArtifact: Endpoint[Artifact.MavenReference, Option[ArtifactResponse]] =
+    endpoint(
+      get(path / "api" / "artifacts" / artifactPath),
+      ok(jsonResponse[ArtifactResponse]).orNotFound()
+    )
+
+  val autocomplete: Endpoint[AutocompletionParams, Seq[AutocompletionResponse]] =
+    endpoint(
+      get(path / "api" / "autocomplete" /? autocompletionQueryString),
+      ok(jsonResponse[Seq[AutocompletionResponse]])
+    )
+}

modules/core/shared/src/main/scala/scaladex/core/api/JsonSchemas.scala

@@ -0,0 +1,62 @@
+package scaladex.core.api
+
+import java.time.Instant
+
+import scaladex.core.model.Artifact
+import scaladex.core.model.Language
+import scaladex.core.model.License
+import scaladex.core.model.Platform
+import scaladex.core.model.Project
+import scaladex.core.model.SemanticVersion
+
+/**
+ * The Json schema of the Scaladex API
+ */
+trait JsonSchemas extends endpoints4s.algebra.JsonSchemas {
+  implicit val projectReferenceSchema: JsonSchema[Project.Reference] =
+    field[String]("organization")
+      .zip(field[String]("repository"))
+      .xmap(Function.tupled(Project.Reference.from(_, _)))(ref => (ref.organization.value, ref.repository.value))
+
+  implicit val mavenReferenceSchema: JsonSchema[Artifact.MavenReference] =
+    field[String]("groupId")
+      .zip(field[String]("artifactId"))
+      .zip(field[String]("version"))
+      .xmap(Function.tupled(Artifact.MavenReference.apply _))(Function.unlift(Artifact.MavenReference.unapply))
+
+  implicit val getArtifactResponseSchema: JsonSchema[ArtifactResponse] =
+    field[String]("groupId")
+      .xmap(Artifact.GroupId.apply)(_.value)
+      .zip(field[String]("artifactId"))
+      .zip(field[String]("version").xmap(SemanticVersion.from)(_.encode))
+      .zip(field[String]("artifactName").xmap(Artifact.Name.apply)(_.value))
+      .zip(field[String]("project").xmap(Project.Reference.from)(_.toString))
+      .zip(field[Long]("releaseDate").xmap(Instant.ofEpochMilli)(_.toEpochMilli))
+      .zip(field[Seq[String]]("licenses").xmap(_.flatMap(License.get))(_.map(_.shortName)))
+      .zip(field[String]("language").xmap(Language.fromLabel(_).get)(_.label))
+      .zip(field[String]("platform").xmap(Platform.fromLabel(_).get)(_.label))
+      .xmap {
+        case (groupId, artifactId, version, artifactName, project, releaseDate, licenses, language, platform) =>
+          ArtifactResponse(
+            groupId,
+            artifactId,
+            version,
+            artifactName,
+            project,
+            releaseDate,
+            licenses,
+            language,
+            platform
+          )
+      }(Function.unlift(ArtifactResponse.unapply))
+
+  implicit val autocompletionResponseSchema: JsonSchema[AutocompletionResponse] =
+    field[String]("organization")
+      .zip(field[String]("repository"))
+      .zip(field[String]("description"))
+      .xmap[AutocompletionResponse] {
+        case (organization, repository, description) => AutocompletionResponse(organization, repository, description)
+      } { autocompletionResponse =>
+        (autocompletionResponse.organization, autocompletionResponse.repository, autocompletionResponse.description)
+      }
+}

modules/core/shared/src/main/scala/scaladex/core/api/ProjectParams.scala

@@ -0,0 +1,3 @@
+package scaladex.core.api
+
+final case class ProjectParams(language: Option[String], platform: Option[String])

modules/core/shared/src/main/scala/scaladex/core/model/Artifact.scala

@@ -7,7 +7,6 @@ import java.time.format.DateTimeFormatter
 import fastparse.P
 import fastparse.Start
 import fastparse._
-import scaladex.core.api.artifact.ArtifactMetadataResponse
 import scaladex.core.model.PatchVersion
 import scaladex.core.util.Parsers._
 
@@ -301,13 +300,4 @@ object Artifact {
     def repoUrl: String =
       s"https://repo1.maven.org/maven2/${groupId.replace('.', '/')}/$artifactId/$version/"
   }
-
-  def toMetadataResponse(artifact: Artifact): ArtifactMetadataResponse =
-    ArtifactMetadataResponse(
-      version = artifact.version.toString,
-      projectReference = Some(artifact.projectRef.toString),
-      releaseDate = artifact.releaseDate.toString,
-      language = artifact.language.toString,
-      platform = artifact.platform.toString
-    )
 }