Add Maven support for purl2url: Add support of type as artifact type

Author: fafanoulele

src/packageurl/contrib/purl2url.py

@@ -402,9 +402,13 @@ def build_maven_download_url(purl):
     if purl_data.qualifiers and "repository_url" in purl_data.qualifiers:
        base_url = purl_data.qualifiers["repository_url"]
 
+    maven_type = "jar" # default to jar
+    if purl_data.qualifiers and "type" in purl_data.qualifiers:
+       maven_type = purl_data.qualifiers["type"]
+
     if namespace and name and version:
         maven_namespace = namespace.replace(".", "/")
-        return f"{base_url}/{maven_namespace}/{name}/{version}/{name}-{version}.jar"
+        return f"{base_url}/{maven_namespace}/{name}/{version}/{name}-{version}.{maven_type}"
 
 
 @download_router.route("pkg:hackage/.*")

tests/contrib/test_purl2url.py

@@ -95,6 +95,7 @@ def test_purl2url_get_download_url():
         "pkg:gitlab/hoppr/[email protected]": "https://gitlab.com/hoppr/hoppr/-/archive/v1.11.1-dev.2/hoppr-v1.11.1-dev.2.tar.gz",
         "pkg:maven/org.apache.commons/[email protected]": "https://repo.maven.apache.org/maven2/org/apache/commons/commons-io/1.3.2/commons-io-1.3.2.jar",
         "pkg:maven/org.apache.commons/[email protected]?repository_url=https://repo1.maven.org/maven2": "https://repo1.maven.org/maven2/org/apache/commons/commons-io/1.3.2/commons-io-1.3.2.jar",
+        "pkg:maven/org.apache.commons/[email protected]?type=pom": "https://repo.maven.apache.org/maven2/org/apache/commons/commons-io/1.3.2/commons-io-1.3.2.pom",
         # From `download_url` qualifier
         "pkg:github/yarnpkg/[email protected]?download_url=https://github.com/yarnpkg/yarn/releases/download/v1.3.2/yarn-v1.3.2.tar.gz&version_prefix=v": "https://github.com/yarnpkg/yarn/releases/download/v1.3.2/yarn-v1.3.2.tar.gz",
         "pkg:generic/lxc-master.tar.gz?download_url=https://salsa.debian.org/lxc-team/lxc/-/archive/master/lxc-master.tar.gz": "https://salsa.debian.org/lxc-team/lxc/-/archive/master/lxc-master.tar.gz",