Update generate_patch_url function to use purl2url.get_patch_url function

Signed-off-by: ziad hany <ziadhany2016@gmail.com>

Author: ziadhany

vulnerabilities/pipelines/v2_improvers/fetch_patch_url.py

@@ -18,7 +18,6 @@ class FetchPatchURLImproverPipeline(VulnerableCodePipeline):
     """FetchPatchURL Improver Pipeline"""
 
     pipeline_id = "fetch_patch_url"
-    precedence = 200
 
     @classmethod
     def steps(cls):

vulnerabilities/utils.py

@@ -34,7 +34,9 @@
 from cwe2.database import Database
 from cwe2.database import InvalidCWEError
 from packageurl import PackageURL
+from packageurl.contrib import purl2url
 from packageurl.contrib.django.utils import without_empty_values
+from packageurl.contrib.url2purl import url2purl
 from univers.version_range import RANGE_CLASS_BY_SCHEMES
 from univers.version_range import AlpineLinuxVersionRange
 from univers.version_range import NginxVersionRange
@@ -873,17 +875,16 @@ def generate_patch_url(vcs_url, commit_hash):
     """
     Generate patch URL from VCS URL and commit hash.
     """
+
     if not vcs_url or not commit_hash:
-        return None
+        return
+
+    purl = url2purl(vcs_url)
+    if not purl:
+        return
+
+    new_purl = PackageURL(
+        type=purl.type, namespace=purl.namespace, name=purl.name, version=commit_hash
+    )
 
-    vcs_url = vcs_url.rstrip("/")
-
-    if vcs_url.startswith("https://github.com"):
-        return f"{vcs_url}/commit/{commit_hash}.patch"
-    elif vcs_url.startswith("https://gitlab.com"):
-        return f"{vcs_url}/-/commit/{commit_hash}.patch"
-    elif vcs_url.startswith("https://bitbucket.org"):
-        return f"{vcs_url}/-/commit/{commit_hash}/raw"
-    elif vcs_url.startswith("https://git.kernel.org"):
-        return f"{vcs_url}.git/patch/?id={commit_hash}"
-    return
+    return purl2url.get_patch_url(str(new_purl))