feat: Add a pipeline to automatically collect and store patch texts from URLs for Patch objects.

Signed-off-by: Dhirenderchoudhary <dhirenderchoudhary0001@gmail.com>

Author: Dhirenderchoudhary

vulnerabilities/pipelines/v2_improvers/collect_patch_texts.py

@@ -0,0 +1,91 @@
+#
+# Copyright (c) nexB Inc. and others. All rights reserved.
+# VulnerableCode is a trademark of nexB Inc.
+# SPDX-License-Identifier: Apache-2.0
+# See http://www.apache.org/licenses/LICENSE-2.0 for the license text.
+# See https://github.com/aboutcode-org/vulnerablecode for support or download.
+# See https://aboutcode.org for more information about nexB OSS projects.
+#
+
+import logging
+
+import requests
+from aboutcode.pipeline import LoopProgress
+from django.db.models import Q
+
+from vulnerabilities.models import Patch
+from vulnerabilities.pipelines import VulnerableCodePipeline
+
+
+class CollectPatchTextsPipeline(VulnerableCodePipeline):
+    """
+    Improver pipeline to collect missing patch texts for Patch objects that have a patch_url.
+    """
+
+    pipeline_id = "collect_patch_texts_v2"
+    license_expression = None
+
+    @classmethod
+    def steps(cls):
+        return (cls.collect_and_store_patch_texts,)
+
+    def collect_and_store_patch_texts(self):
+        patches_without_text = Patch.objects.filter(
+            Q(patch_url__isnull=False) & ~Q(patch_url=""),
+            Q(patch_text__isnull=True) | Q(patch_text=""),
+        )
+
+        self.log(f"Processing {patches_without_text.count():,d} patches to collect text.")
+
+        updated_patch_count = 0
+        progress = LoopProgress(total_iterations=patches_without_text.count(), logger=self.log)
+
+        for patch in progress.iter(patches_without_text.iterator(chunk_size=500)):
+            raw_url = get_raw_patch_url(patch.patch_url)
+            if not raw_url:
+                continue
+
+            try:
+                response = requests.get(raw_url, timeout=10)
+                if response.status_code == 200:
+                    patch.patch_text = response.text
+                    patch.save()
+                    updated_patch_count += 1
+                else:
+                    self.log(
+                        f"Failed to fetch patch from {raw_url}: Status {response.status_code}",
+                        level=logging.WARNING if response.status_code < 500 else logging.ERROR,
+                    )
+            except requests.RequestException as e:
+                self.log(f"Error fetching patch from {raw_url}: {e}", level=logging.ERROR)
+
+        self.log(f"Successfully collected text for {updated_patch_count:,d} Patch entries.")
+
+
+def get_raw_patch_url(url):
+    """
+    Return a fetchable raw patch URL from common VCS hosting URLs,
+    or the URL itself if it already points to a .patch or .diff file.
+    Return None if the URL type is not recognized.
+    """
+    if not url:
+        return None
+
+    url = url.strip()
+
+    if "github.com" in url and "/commit/" in url and not url.endswith(".patch"):
+        return f"{url}.patch"
+
+    if "github.com" in url and "/pull/" in url and not url.endswith(".patch"):
+        return f"{url}.patch"
+
+    if "gitlab.com" in url and "/commit/" in url and not url.endswith(".patch"):
+        return f"{url}.patch"
+
+    if "gitlab.com" in url and "/merge_requests/" in url and not url.endswith(".patch"):
+        return f"{url}.patch"
+
+    if url.endswith(".patch") or url.endswith(".diff"):
+        return url
+
+    return None

vulnerabilities/tests/pipelines/v2_improvers/test_collect_patch_texts.py

@@ -0,0 +1,86 @@
+#
+# Copyright (c) nexB Inc. and others. All rights reserved.
+# VulnerableCode is a trademark of nexB Inc.
+# SPDX-License-Identifier: Apache-2.0
+# See http://www.apache.org/licenses/LICENSE-2.0 for the license text.
+# See https://github.com/aboutcode-org/vulnerablecode for support or download.
+# See https://aboutcode.org for more information about nexB OSS projects.
+#
+
+import unittest
+from unittest.mock import MagicMock
+from unittest.mock import patch as mock_patch
+
+from vulnerabilities.pipelines.v2_improvers.collect_patch_texts import CollectPatchTextsPipeline
+from vulnerabilities.pipelines.v2_improvers.collect_patch_texts import get_raw_patch_url
+
+
+class TestCollectPatchTextsPipeline(unittest.TestCase):
+    def setUp(self):
+        self.pipeline = CollectPatchTextsPipeline()
+
+    def test_get_raw_patch_url(self):
+        url = "https://github.com/user/repo/commit/abc1234567890"
+        expected = "https://github.com/user/repo/commit/abc1234567890.patch"
+        self.assertEqual(get_raw_patch_url(url), expected)
+
+        url = "https://github.com/user/repo/pull/123"
+        expected = "https://github.com/user/repo/pull/123.patch"
+        self.assertEqual(get_raw_patch_url(url), expected)
+
+        url = "https://gitlab.com/user/repo/-/commit/abc1234567890"
+        expected = "https://gitlab.com/user/repo/-/commit/abc1234567890.patch"
+        self.assertEqual(get_raw_patch_url(url), expected)
+
+        url = "https://gitlab.com/user/repo/-/merge_requests/123"
+        expected = "https://gitlab.com/user/repo/-/merge_requests/123.patch"
+        self.assertEqual(get_raw_patch_url(url), expected)
+
+        url = "https://example.com/fix.patch"
+        self.assertEqual(get_raw_patch_url(url), url)
+
+        url = "https://example.com/some/article"
+        self.assertIsNone(get_raw_patch_url(url))
+
+    @mock_patch("vulnerabilities.pipelines.v2_improvers.collect_patch_texts.Patch")
+    @mock_patch("requests.get")
+    def test_collect_and_store_patch_texts(self, mock_get, mock_patch_model):
+        p1 = MagicMock(patch_url="https://github.com/u/r/commit/c1", patch_text=None)
+        p2 = MagicMock(patch_url="https://github.com/u/r/pull/1", patch_text="")
+        p3 = MagicMock(patch_url="https://example.com/no-patch", patch_text=None)
+        p4 = MagicMock(patch_url="https://example.com/fix.patch", patch_text=None)
+
+        mock_qs = MagicMock()
+        mock_qs.count.return_value = 4
+        mock_qs.iterator.return_value = [p1, p2, p3, p4]
+        
+        mock_patch_model.objects.filter.return_value = mock_qs
+
+        def side_effect(url, timeout=10):
+            mock_resp = MagicMock()
+            mock_resp.status_code = 404
+            if url == "https://github.com/u/r/commit/c1.patch":
+                mock_resp.status_code = 200
+                mock_resp.text = "diff --git a/file b/file\n+code"
+            elif url == "https://github.com/u/r/pull/1.patch":
+                mock_resp.status_code = 200
+                mock_resp.text = "diff --git a/pr b/pr\n+pr_code"
+            elif url == "https://example.com/fix.patch":
+                mock_resp.status_code = 200
+                mock_resp.text = "diff --git a/direct b/direct\n+direct_code"
+            return mock_resp
+
+        mock_get.side_effect = side_effect
+
+        self.pipeline.collect_and_store_patch_texts()
+
+        self.assertEqual(p1.patch_text, "diff --git a/file b/file\n+code")
+        p1.save.assert_called_once()
+
+        self.assertEqual(p2.patch_text, "diff --git a/pr b/pr\n+pr_code")
+        p2.save.assert_called_once()
+
+        p3.save.assert_not_called()
+
+        self.assertEqual(p4.patch_text, "diff --git a/direct b/direct\n+direct_code")
+        p4.save.assert_called_once()