From af515d325b7fb2bb25ecc26155554d1915d6939a Mon Sep 17 00:00:00 2001
From: Sebastian Schuberth <sschuberth@gmail.com>
Date: Mon, 7 Nov 2022 21:41:50 +0100
Subject: [PATCH] NuGetSupport: Properly split the (technology) namespace from
 the name

Use up to two namespace nodes from the name as defined at [1] as the
package namespace.

[1]: https://learn.microsoft.com/en-us/dotnet/standard/design-guidelines/names-of-namespaces

Signed-off-by: Sebastian Schuberth <sschuberth@gmail.com>
---
 .../kotlin/managers/utils/NuGetSupport.kt     | 32 +++++++++++++------
 .../kotlin/managers/utils/NuGetSupportTest.kt | 21 +++++++++++-
 2 files changed, 43 insertions(+), 10 deletions(-)

diff --git a/analyzer/src/main/kotlin/managers/utils/NuGetSupport.kt b/analyzer/src/main/kotlin/managers/utils/NuGetSupport.kt
index 4e08734e11542..6a2b5c2230b9c 100644
--- a/analyzer/src/main/kotlin/managers/utils/NuGetSupport.kt
+++ b/analyzer/src/main/kotlin/managers/utils/NuGetSupport.kt
@@ -148,8 +148,12 @@ class NuGetSupport(serviceIndexUrls: List<String> = listOf(DEFAULT_SERVICE_INDEX
     }
 
     private fun getAllPackageData(id: Identifier): NuGetAllPackageData {
-        // Note: The package name in the URL is case-sensitive and must be lower-case!
-        val lowerId = id.name.lowercase()
+        // Note: The id in the URL is case-sensitive and must be lower-case!
+        val lowerId = if (id.namespace.isNotEmpty()) {
+            "${id.namespace}.${id.name}"
+        } else {
+            id.name
+        }.lowercase()
 
         val data = registrationsBaseUrls.firstNotNullOfOrNull { baseUrl ->
             runCatching {
@@ -289,8 +293,12 @@ private fun parseAuthors(spec: PackageSpec?): SortedSet<String> =
 private fun resolveLocalSpec(definitionFile: File): File? =
     definitionFile.parentFile?.resolve(".nuspec")?.takeIf { it.isFile }
 
-private fun getIdentifier(name: String, version: String) =
-    Identifier(type = "NuGet", namespace = "", name = name, version = version)
+internal fun getIdentifier(name: String, version: String): Identifier {
+    val namespace = name.split('.', limit = 3).toMutableList()
+    val nameWithoutNamespace = namespace.removeLast()
+    val namespaceWithoutName = namespace.joinToString(".")
+    return Identifier(type = "NuGet", namespace = namespaceWithoutName, name = nameWithoutNamespace, version = version)
+}
 
 data class NuGetDependency(
     val name: String,
@@ -357,13 +365,19 @@ private fun PackageManager.getProject(
 ): Project {
     val spec = resolveLocalSpec(definitionFile)?.let { NuGetSupport.XML_MAPPER.readValue<PackageSpec>(it) }
 
-    return Project(
-        id = Identifier(
+    val id = if (spec != null) {
+        getIdentifier(spec.metadata.id, spec.metadata.version)
+    } else {
+        Identifier(
             type = managerName,
             namespace = "",
-            name = spec?.metadata?.id ?: definitionFile.relativeTo(analysisRoot).invariantSeparatorsPath,
-            version = spec?.metadata?.version.orEmpty()
-        ),
+            name = definitionFile.relativeTo(analysisRoot).invariantSeparatorsPath,
+            version = ""
+        )
+    }
+
+    return Project(
+        id = id,
         definitionFilePath = VersionControlSystem.getPathInfo(definitionFile).path,
         authors = parseAuthors(spec),
         declaredLicenses = parseLicenses(spec),
diff --git a/analyzer/src/test/kotlin/managers/utils/NuGetSupportTest.kt b/analyzer/src/test/kotlin/managers/utils/NuGetSupportTest.kt
index 391950843fd10..0232bbf6a85eb 100644
--- a/analyzer/src/test/kotlin/managers/utils/NuGetSupportTest.kt
+++ b/analyzer/src/test/kotlin/managers/utils/NuGetSupportTest.kt
@@ -19,14 +19,33 @@
 
 package org.ossreviewtoolkit.analyzer.managers.utils
 
+import io.kotest.assertions.assertSoftly
 import io.kotest.core.spec.style.WordSpec
 import io.kotest.matchers.collections.containExactly
 import io.kotest.matchers.should
+import io.kotest.matchers.shouldBe
 
 import java.io.File
 
+import org.ossreviewtoolkit.model.Identifier
+
 class NuGetSupportTest : WordSpec({
-    "getRegistrationsBaseUrls" should {
+    "getIdentifier()" should {
+        "split the namespace from the name" {
+            assertSoftly {
+                getIdentifier( "SharpCompress", "0.23.0") shouldBe
+                        Identifier("NuGet::SharpCompress:0.23.0")
+                getIdentifier( "System.IO", "4.1.0") shouldBe
+                        Identifier("NuGet:System:IO:4.1.0")
+                getIdentifier( "System.IO.Compression", "4.3.0") shouldBe
+                        Identifier("NuGet:System.IO:Compression:4.3.0")
+                getIdentifier(  "System.IO.Compression.ZipFile", "4.0.1") shouldBe
+                        Identifier("NuGet:System.IO:Compression.ZipFile:4.0.1")
+            }
+        }
+    }
+
+    "getRegistrationsBaseUrls()" should {
         "parse index urls" {
             val reader = NuGetConfigFileReader()
             val configFile = File("src/funTest/assets/projects/synthetic/nuget/nuget.config")