Add support for Composer in purl2url

src/packageurl/contrib/purl2url.py

@@ -225,6 +225,23 @@ def build_pypi_repo_url(purl):
         return f"https://pypi.org/project/{name}/"
 
 
+@repo_router.route("pkg:composer/.*")
+def build_composer_repo_url(purl):
+    """
+    Return a composer repo URL from the `purl` string.
+    """
+    purl_data = PackageURL.from_string(purl)
+
+    name = purl_data.name
+    version = purl_data.version
+    namespace = purl_data.namespace
+
+    if name and version:
+        return f"https://packagist.org/packages/{namespace}/{name}#{version}"
+    elif name:
+        return f"https://packagist.org/packages/{namespace}/{name}"
+
+
 @repo_router.route("pkg:nuget/.*")
 def build_nuget_repo_url(purl):
     """

src/packageurl/contrib/url2purl.py

@@ -326,6 +326,21 @@ def build_pypi_purl(uri):
     return purl_from_pattern("pypi", pypi_pattern, last_segment)
 
 
+# https://packagist.org/packages/webmozart/assert#1.9.1
+@purl_router.route("https?://packagist.org/packages/.*")
+def build_composer_purl(uri):
+    # We use a more general route pattern instead of using `composer_pattern`
+    # below by itself because we want to capture all packagist download URLs,
+    # even the ones that are not completely formed. This helps prevent url2purl
+    # from attempting to create a generic PackageURL from an invalid packagist
+    # download URL.
+
+    # https://packagist.org/packages/ralouphie/getallheaders
+    # https://packagist.org/packages/symfony/process#v7.0.0-BETA3
+    composer_pattern = r"^https?://packagist\.org/packages/(?P<namespace>[^/]+)/(?P<name>[^\#]+?)(\#(?P<version>.+))?$"
+    return purl_from_pattern("composer", composer_pattern, uri)
+
+
 # http://nuget.org/packages/EntityFramework/4.2.0.0
 # https://www.nuget.org/api/v2/package/Newtonsoft.Json/11.0.1
 nuget_www_pattern = r"^https?://.*nuget.org/(api/v2/)?packages?/(?P<name>.+)/(?P<version>.+)$"

tests/contrib/data/url2purl.json

@@ -121,6 +121,9 @@
   "https://rubygems.org/downloads/unf-0.1.3.gem": "pkg:gem/[email protected]",
   "https://rubygems.org/downloads/yajl-ruby-1.2.0.gem": "pkg:gem/[email protected]",
   "https://rubygems.org/gems/i18n-js-3.0.11.gem": "pkg:gem/[email protected]",
+  "https://packagist.org/packages/webmozart/assert":"pkg:composer/webmozart/assert",
+  "https://packagist.org/packages/guzzlehttp/psr7#2.6.1":"pkg:composer/guzzlehttp/[email protected]",
+  "https://packagist.org/packages/symfony/process#v7.0.0-BETA3":"pkg:composer/symfony/[email protected]",
   "https://pypi.org/packages/source/z/zc.recipe.egg/zc.recipe.egg-2.0.0.tar.gz": "pkg:pypi/[email protected]",
   "https://pypi.org/project/widgetsnbextension": "pkg:pypi/widgetsnbextension",
   "https://pypi.org/project/widgetsnbextension/3.0.7/": "pkg:pypi/[email protected]",

tests/contrib/test_purl2url.py

@@ -53,6 +53,8 @@ def test_purl2url_get_repo_url():
         "pkg:pypi/sortedcontainers": "https://pypi.org/project/sortedcontainers/",
         "pkg:pypi/[email protected]": "https://pypi.org/project/sortedcontainers/2.4.0/",
         "pkg:pypi/packageurl_python": "https://pypi.org/project/packageurl-python/",
+        "pkg:composer/psr/log": "https://packagist.org/packages/psr/log",
+        "pkg:composer/psr/[email protected]": "https://packagist.org/packages/psr/log#1.1.3",
         "pkg:npm/is-npm": "https://www.npmjs.com/package/is-npm",
         "pkg:npm/[email protected]": "https://www.npmjs.com/package/is-npm/v/1.0.0",
         "pkg:nuget/System.Text.Json": "https://www.nuget.org/packages/System.Text.Json",
@@ -95,6 +97,7 @@ def test_purl2url_get_download_url():
         "pkg:rubygems/package-name": None,
         "pkg:bitbucket/birkenfeld": None,
         "pkg:pypi/[email protected]": None,
+        "pkg:composer/psr/[email protected]": None,
         "pkg:golang/xorm.io/[email protected]": None,
         "pkg:golang/gopkg.in/[email protected]": None,
     }
@@ -132,6 +135,7 @@ def test_purl2url_get_inferred_urls():
             "https://gitlab.com/tg1999/firebase/-/archive/1a122122/firebase-1a122122.tar.gz",
         ],
         "pkg:pypi/[email protected]": ["https://pypi.org/project/sortedcontainers/2.4.0/"],
+        "pkg:composer/psr/[email protected]": ["https://packagist.org/packages/psr/log#1.1.3"],
         "pkg:rubygems/package-name": ["https://rubygems.org/gems/package-name"],
         "pkg:bitbucket/birkenfeld": [],
     }

tests/data/test-suite-data.json

@@ -191,6 +191,18 @@
     "subpath": null,
     "is_invalid": false
   },
+  {
+    "description": "valid packagist purl",
+    "purl": "pkg:composer/guzzlehttp/[email protected]",
+    "canonical_purl": "pkg:composer/guzzlehttp/[email protected]",
+    "type": "composer",
+    "namespace": "guzzlehttp",
+    "name": "promises",
+    "version": "2.0.2",
+    "qualifiers": null,
+    "subpath": null,
+    "is_invalid": false
+  },
   {
     "description": "rpm often use qualifiers",
     "purl": "pkg:Rpm/fedora/[email protected]?Arch=i386&Distro=fedora-25",