Add proxy pass route for id resolution

delta/app/src/main/resources/app.conf

@@ -50,6 +50,8 @@ app {
     # Allows to return a redirection when fetching a resource with the `Accept` header
     # set to `text/html`
     enable-redirects = false
+    # base to use to reconstruct resource identifiers in the proxy pass
+    resolve-base = "http://localhost:8081"
   }
 
   # Json-LD Api configuration

delta/plugins/elasticsearch/src/main/scala/ch/epfl/bluebrain/nexus/delta/plugins/elasticsearch/ElasticSearchPluginModule.scala

@@ -271,9 +271,10 @@ class ElasticSearchPluginModule(priority: Int) extends ModuleDef {
         s: Scheduler,
         ordering: JsonKeyOrdering,
         rcr: RemoteContextResolution @Id("aggregate"),
-        fusionConfig: FusionConfig
+        fusionConfig: FusionConfig,
+        baseUri: BaseUri
     ) =>
-      new IdResolutionRoutes(identities, aclCheck, idResolution)(
+      new IdResolutionRoutes(identities, aclCheck, idResolution, baseUri)(
         s,
         ordering,
         rcr,

delta/plugins/elasticsearch/src/main/scala/ch/epfl/bluebrain/nexus/delta/plugins/elasticsearch/routes/IdResolutionRoutes.scala

@@ -1,29 +1,34 @@
 package ch.epfl.bluebrain.nexus.delta.plugins.elasticsearch.routes
 
-import akka.http.scaladsl.model.Uri
+import akka.http.scaladsl.model.{StatusCodes, Uri}
 import akka.http.scaladsl.server.Directives._
 import akka.http.scaladsl.server.Route
 import ch.epfl.bluebrain.nexus.delta.plugins.elasticsearch.IdResolutionResponse.{MultipleResults, SingleResult}
 import ch.epfl.bluebrain.nexus.delta.plugins.elasticsearch.query.ElasticSearchQueryError
 import ch.epfl.bluebrain.nexus.delta.plugins.elasticsearch.{IdResolution, IdResolutionResponse}
 import ch.epfl.bluebrain.nexus.delta.rdf.jsonld.context.RemoteContextResolution
+import ch.epfl.bluebrain.nexus.delta.rdf.syntax.uriSyntax
 import ch.epfl.bluebrain.nexus.delta.rdf.utils.JsonKeyOrdering
 import ch.epfl.bluebrain.nexus.delta.sdk.acls.AclCheck
 import ch.epfl.bluebrain.nexus.delta.sdk.directives.AuthDirectives
 import ch.epfl.bluebrain.nexus.delta.sdk.directives.DeltaDirectives._
 import ch.epfl.bluebrain.nexus.delta.sdk.fusion.FusionConfig
 import ch.epfl.bluebrain.nexus.delta.sdk.identities.Identities
+import ch.epfl.bluebrain.nexus.delta.sdk.model.BaseUri
 import monix.bio.{IO, UIO}
 import monix.execution.Scheduler
 
 class IdResolutionRoutes(
     identities: Identities,
     aclCheck: AclCheck,
-    idResolution: IdResolution
+    idResolution: IdResolution,
+    baseUri: BaseUri
 )(implicit s: Scheduler, jko: JsonKeyOrdering, rcr: RemoteContextResolution, fusionConfig: FusionConfig)
     extends AuthDirectives(identities, aclCheck) {
 
-  def routes: Route =
+  def routes: Route = concat(resolutionRoute, proxyRoute)
+
+  private def resolutionRoute: Route =
     pathPrefix("resolve") {
       extractCaller { implicit caller =>
         (get & iriSegment & pathEndOrSingleSlash) { iri =>
@@ -37,6 +42,19 @@ class IdResolutionRoutes(
       }
     }
 
+  private def proxyRoute: Route =
+    pathPrefix("resolve-proxy-pass") {
+      extractUnmatchedPath { path =>
+        get {
+          val resourceId = fusionConfig.resolveBase / path
+          emitOrFusionRedirect(
+            fusionResolveUri(resourceId),
+            redirect(deltaResolveEndpoint(resourceId), StatusCodes.SeeOther)
+          )
+        }
+      }
+    }
+
   private def fusionUri(
       resolved: IO[ElasticSearchQueryError, IdResolutionResponse.Result]
   ): UIO[Uri] =
@@ -47,4 +65,7 @@ class IdResolutionRoutes(
       }
       .onErrorHandleWith { _ => fusionLoginUri }
 
+  private def deltaResolveEndpoint(id: Uri): Uri =
+    baseUri.endpoint / "resolve" / id.toString
+
 }

delta/plugins/elasticsearch/src/test/scala/ch/epfl/bluebrain/nexus/delta/plugins/elasticsearch/routes/IdResolutionRoutesSuite.scala

@@ -1,6 +1,7 @@
 package ch.epfl.bluebrain.nexus.delta.plugins.elasticsearch.routes
 
-import akka.http.scaladsl.model.StatusCodes
+import akka.http.scaladsl.model.headers.Location
+import akka.http.scaladsl.model.{HttpResponse, StatusCodes}
 import akka.http.scaladsl.server.Route
 import ch.epfl.bluebrain.nexus.delta.kernel.utils.UrlUtils
 import ch.epfl.bluebrain.nexus.delta.plugins.elasticsearch.IdResolution
@@ -43,7 +44,8 @@ class IdResolutionRoutesSuite extends ElasticSearchViewsRoutesFixtures {
     }
 
   private val idResolution = new IdResolution(dummyDefaultViewsQuery, fetchResource)
-  private val route        = Route.seal(new IdResolutionRoutes(identities, aclCheck, idResolution).routes)
+  private val route        =
+    Route.seal(new IdResolutionRoutes(identities, aclCheck, idResolution, baseUri).routes)
 
   "The IdResolution route" should {
 
@@ -54,6 +56,21 @@ class IdResolutionRoutesSuite extends ElasticSearchViewsRoutesFixtures {
       }
     }
 
+    "redirect the proxy call to the resolve endpoint" in {
+      val segment             = s"neurosciencegraph/data/$uuid"
+      val fullId              = s"https://bbp.epfl.ch/$segment"
+      val expectedRedirection = s"$baseUri/resolve/${UrlUtils.encode(fullId)}".replace("%3A", ":")
+
+      Get(s"/resolve-proxy-pass/$segment") ~> route ~> check {
+        response.status shouldEqual StatusCodes.SeeOther
+        response.locationHeader shouldEqual expectedRedirection
+      }
+    }
+
+  }
+
+  implicit class HeaderOps(response: HttpResponse) {
+    def locationHeader: String = response.header[Location].value.uri.toString()
   }
 
 }

delta/sdk/src/main/scala/ch/epfl/bluebrain/nexus/delta/sdk/directives/DeltaDirectives.scala

@@ -180,6 +180,10 @@ trait DeltaDirectives extends UriDirectives {
   def fusionLoginUri(implicit config: FusionConfig): UIO[Uri] =
     UIO.pure { config.base / "login" }
 
+  /** The URI of fusion's id resolution endpoint */
+  def fusionResolveUri(id: Uri)(implicit config: FusionConfig): UIO[Uri] =
+    UIO.pure { config.base / "resolve" / id.toString }
+
   /** Injects a `Vary: Accept,Accept-Encoding` into the response */
   def varyAcceptHeaders: Directive0 =
     vary(Set(Accept.name, `Accept-Encoding`.name))

delta/sdk/src/main/scala/ch/epfl/bluebrain/nexus/delta/sdk/fusion/FusionConfig.scala

@@ -11,8 +11,10 @@ import pureconfig.generic.semiauto.deriveReader
   *   the base url of fusion
   * @param enableRedirects
   *   enables redirections to Fusion if the `Accept` header is set to `text/html`
+  * @param resolveBase
+  *   base to use to reconstruct resource identifiers in the resolve proxy pass
   */
-final case class FusionConfig(base: Uri, enableRedirects: Boolean)
+final case class FusionConfig(base: Uri, enableRedirects: Boolean, resolveBase: Uri)
 
 object FusionConfig {
   implicit final val fusionConfigReader: ConfigReader[FusionConfig] =

delta/sdk/src/test/scala/ch/epfl/bluebrain/nexus/delta/sdk/ConfigFixtures.scala

@@ -33,7 +33,8 @@ trait ConfigFixtures {
   def httpClientConfig: HttpClientConfig =
     HttpClientConfig(RetryStrategyConfig.AlwaysGiveUp, HttpClientWorthRetry.never, false)
 
-  def fusionConfig: FusionConfig = FusionConfig(Uri("https://bbp.epfl.ch/nexus/web/"), enableRedirects = true)
+  def fusionConfig: FusionConfig =
+    FusionConfig(Uri("https://bbp.epfl.ch/nexus/web/"), enableRedirects = true, Uri("https://bbp.epfl.ch"))
 
   def deletionConfig: ProjectsConfig.DeletionConfig = ProjectsConfig.DeletionConfig(
     enabled = true,

delta/sdk/src/test/scala/ch/epfl/bluebrain/nexus/delta/sdk/directives/DeltaDirectivesSpec.scala

@@ -57,7 +57,8 @@ class DeltaDirectivesSpec
       List("@context", "@id", "@type", "reason", "details", "sourceId", "projectionId", "_total", "_results")
     )
 
-  implicit private val f: FusionConfig = FusionConfig(Uri("https://bbp.epfl.ch/nexus/web/"), enableRedirects = true)
+  implicit private val f: FusionConfig =
+    FusionConfig(Uri("https://bbp.epfl.ch/nexus/web/"), enableRedirects = true, Uri("https://bbp.epfl.ch"))
 
   implicit val baseUri: BaseUri = BaseUri("http://localhost", Label.unsafe("v1"))
 

delta/sdk/src/test/scala/ch/epfl/bluebrain/nexus/delta/sdk/utils/RouteFixtures.scala

@@ -56,7 +56,8 @@ trait RouteFixtures {
 
   implicit val baseUri: BaseUri                   = BaseUri("http://localhost", Label.unsafe("v1"))
   implicit val paginationConfig: PaginationConfig = PaginationConfig(5, 10, 5)
-  implicit val f: FusionConfig                    = FusionConfig(Uri("https://bbp.epfl.ch/nexus/web/"), enableRedirects = true)
+  implicit val f: FusionConfig                    =
+    FusionConfig(Uri("https://bbp.epfl.ch/nexus/web/"), enableRedirects = true, Uri("https://bbp.epfl.ch"))
   implicit val s: Scheduler                       = Scheduler.global
   implicit val rejectionHandler: RejectionHandler = RdfRejectionHandler.apply
   implicit val exceptionHandler: ExceptionHandler = RdfExceptionHandler.apply

docs/src/main/paradox/docs/delta/api/assets/id-resolution/proxy-request.sh

@@ -0,0 +1 @@
+curl "http://localhost:8080/v1/resolve-proxy-pass/nexus/data/identifier"

docs/src/main/paradox/docs/delta/api/assets/id-resolution/proxy-response-delta.html

@@ -0,0 +1,3 @@
+303 See Other
+The response to the request can be found under <a href="https://localhost:8080/v1/resolve/https:%2F%2Fexample.com%2Fnexus%2Fdata%2Fidentifier">this URI</a> using a
+GET method.

docs/src/main/paradox/docs/delta/api/assets/id-resolution/proxy-response-fusion.html

@@ -0,0 +1,3 @@
+303 See Other
+The response to the request can be found under <a href="http://localhost:8080/fusion/resolve/https:%2F%2Fexample.com%2Fnexus%2Fdata%2Fidentifier">this URI</a> using a
+GET method.

docs/src/main/paradox/docs/delta/api/id-resolution.md

@@ -37,3 +37,66 @@ Response (single resource)
 Response (multiple choices)
 :   @@snip [response.json](assets/id-resolution/multiple-resolution-response.json)
 
+### Fusion Redirection
+
+When querying the resolve endpoint, it is possible to add the `Accept: text/html` header in order for Nexus Delta to
+redirect to the appropriate Nexus Fusion page.
+
+## Resolve (Proxy Pass)
+
+@@@ note { .warning }
+
+This endpoint is designed for the Nexus deployment at the Blue Brain Project and as such might not suit the needs of
+other deployments.
+
+@@@
+
+The @ref:[resolve](#resolve) endpoint offers resource resolution on the resources the caller has access to. As such, if
+the client is a browser and does not have the ability to include an authorization header in the request, it is possible
+to use the proxy pass version of the resolve endpoint which will lead the client to a Nexus Fusion authentication page.
+This will allow to "inject" the user's token in a subsequent @ref:[resolve](#resolve) request made by Nexus Fusion.
+
+### Configuration
+
+* `app.fusion.base`: String - base URL for Nexus Fusion
+* `app.fusion.enable-redirects`: Boolean - needs to be `true` in order for redirects to work (defaults to `false`)
+* `app.fusion.resolve-base`: String - base URL to use when reconstructing the resource identifier in the
+  proxy pass endpoint
+
+### Redirection
+
+1. The client calls `/v1/resolve-proxy-pass/{segment}`
+2. Nexus Delta reconstructs the resource identifier
+    * `{resourceId}` = `{resolveBase}/{segment}`
+3. Nexus Delta redirects the client to...
+    * the `{fusionBaseUrl}/resolve/{resourceId}` Fusion endpoint if the `Accept: text/html` header is present
+    * the `/v1/resolve/{resourceId}` Delta endpoint otherwise
+
+The Nexus Fusion resolve page allows the user to authenticate (if they are not already authenticated) and will perform a
+call to the Nexus Delta `/v1/resolve/{resourceId}` with the user's authentication token.
+
+All calls to the `/v1/resolve-proxy-pass` endpoint lead to
+@link:[303 See Other responses](https://developer.mozilla.org/en-US/docs/Web/HTTP/Status/303).
+
+### Example
+
+The example below assumes that:
+
+* `{fusionBaseUrl}` = `http://localhost:8080/fusion`
+* `{segment}` = `nexus/data/identifier`
+* `{resolveBase}` = `https://example.com`
+
+Request
+:   @@snip [request.sh](assets/id-resolution/proxy-request.sh)
+
+Redirect (when `Acccept:text/html` is provided)
+:   @@snip [response.json](assets/id-resolution/proxy-response-fusion.html)
+
+Redirect (no `Accept:text/html` provided)
+:   @@snip [response.json](assets/id-resolution/proxy-response-delta.html)
+
+#### Remark
+
+In your networking setup, if a proxy pass is enabled to map `https://example.com/nexus/data/*`
+to `https://localhost:8080/v1/resolve-proxy-pass/nexus/data/*`, the proxy pass allows to de facto resolve resource with
+identifier of the type `https://example.com/nexus/data/*` by simply querying their `@id`.

tests/src/test/scala/ch/epfl/bluebrain/nexus/tests/kg/IdResolutionSpec.scala

@@ -36,6 +36,11 @@ class IdResolutionSpec extends BaseSpec {
   private val uniqueResourcePayload = resource(uniqueId)
   private val reusedResourcePayload = resource(reusedId)
 
+  private val neurosciencegraphSegment   = "neurosciencegraph/data/segment"
+  private val proxyIdBase                = "http://localhost:8081"
+  private val neurosciencegraphId        = s"$proxyIdBase/$neurosciencegraphSegment"
+  private val encodedNeurosciencegraphId = UrlUtils.encode(neurosciencegraphId)
+
   private val unauthorizedAccessErrorPayload =
     jsonContentOf("iam/errors/unauthorized-access.json")
 
@@ -110,6 +115,20 @@ class IdResolutionSpec extends BaseSpec {
 
     "redirect to fusion resource selection page if text/html accept header is present (multiple result)" in { pending }
 
+    "redirect to delta resolve if the request comes to the proxy endpoint" in {
+      deltaClient.get[String](s"/resolve-proxy-pass/$neurosciencegraphSegment", Bob) { (_, response) =>
+        response.status shouldEqual StatusCodes.SeeOther
+        locationHeaderOf(response) shouldEqual deltaResolveEndpoint(encodedNeurosciencegraphId)
+      }(PredefinedFromEntityUnmarshallers.stringUnmarshaller)
+    }
+
+    "redirect to fusion resolve if the request comes to the proxy endpoint with text/html accept header is present" in {
+      deltaClient.get[String](s"/resolve-proxy-pass/$neurosciencegraphSegment", Bob, acceptTextHtml) { (_, response) =>
+        response.status shouldEqual StatusCodes.SeeOther
+        locationHeaderOf(response) shouldEqual fusionResolveEndpoint(encodedNeurosciencegraphId)
+      }(PredefinedFromEntityUnmarshallers.stringUnmarshaller)
+    }
+
   }
 
   private def locationHeaderOf(response: HttpResponse) =
@@ -118,5 +137,9 @@ class IdResolutionSpec extends BaseSpec {
     List(Accept(MediaRange.One(`text/html`, 1f)))
   private def fusionResourcePageFor(encodedId: String) =
     s"https://bbp.epfl.ch/nexus/web/$ref11/resources/$encodedId".replace("%3A", ":")
+  private def fusionResolveEndpoint(encodedId: String) =
+    s"https://bbp.epfl.ch/nexus/web/resolve/$encodedId".replace("%3A", ":")
+  private def deltaResolveEndpoint(encodedId: String)  =
+    s"http://delta:8080/v1/resolve/$encodedId".replace("%3A", ":")
 
 }