fix(attachments): raise SW360Error on failed downloads

Fixes #20

Author: gernot-h

ChangeLog.md

@@ -7,6 +7,8 @@
 
 ## NEXT
 
+* fix: download_xxx_attachment now raises an SW360Error for failed downloads
+  instead of silently creating a file containing the JSON answer
 * dependency updates to fix requests CVE-2023-32681.
 * be REUSE compliant.
 * get rid of json_params_matcher deprecation warning.

sw360/attachments.py

@@ -169,7 +169,10 @@ def download_attachment(self, filename, download_url):
         hdr = self.api_headers.copy()
         hdr["Accept"] = "application/*"
         req = requests.get(download_url, allow_redirects=True, headers=hdr)
-        open(filename, "wb").write(req.content)
+        if req.ok:
+            open(filename, "wb").write(req.content)
+        else:
+            raise SW360Error(req, download_url)
 
     def _upload_resource_attachment(self, resource_type, resource_id, upload_file,
                                     upload_type="SOURCE", upload_comment=""):

tests/test_sw360_attachments.py

@@ -216,6 +216,37 @@ def test_download_release_attachment(self):
         os.remove(filename)
         os.removedirs(tmpdir)
 
+    @responses.activate
+    def test_download_release_attachment_404(self):
+        lib = SW360(self.MYURL, self.MYTOKEN, False)
+        lib.force_no_session = True
+        self._add_login_response()
+        actual = lib.login_api()
+        self.assertTrue(actual)
+
+        url = self.MYURL + "resource/api/releases/1234/attachments/5678"
+        responses.add(
+            method=responses.GET,
+            url=url,
+            body='xxxx',
+            status=404,
+            content_type="application/text",
+            adding_headers={"Authorization": "Token " + self.MYTOKEN},
+        )
+
+        tmpdir = tempfile.mkdtemp()
+        filename = os.path.join(tmpdir, "test_attachment.txt")
+        if os.path.exists(filename):
+            os.remove(filename)
+
+        self.assertFalse(os.path.exists(filename))
+        with self.assertRaises(SW360Error) as context:
+            lib.download_release_attachment(filename, "1234", "5678")
+        self.assertFalse(os.path.exists(filename))
+        self.assertEqual(context.exception.url, url)
+        self.assertEqual(context.exception.response.status_code, 404)
+        os.removedirs(tmpdir)
+
     @responses.activate
     def test_download_project_attachment(self):
         lib = SW360(self.MYURL, self.MYTOKEN, False)