Fixing support for package download API.

Adding "application/octet-stream" to default_accept_types
in order to allow calling the package download api with
the header "accept"="application/octet-stream".
Adding test for the fix, including negative test with
bad accept type.

Change-Id: I682e312b24183354b62fe10f45c412bf65e4f71e
Closes-Bug: #1485480

murano/common/wsgi.py

@@ -291,7 +291,9 @@ class Request(webob.Request):
                                      'application/xml',
                                      'application/murano-packages-json-patch',
                                      'multipart/form-data')
-    default_accept_types = ('application/json', 'application/xml')
+    default_accept_types = ('application/json',
+                            'application/xml',
+                            'application/octet-stream')
 
     def best_match_content_type(self, supported_content_types=None):
         """Determine the requested response content-type.

murano/tests/unit/api/base.py

@@ -173,6 +173,14 @@ class ControllerTest(object):
         return self._simple_request(path, params=params, user=user,
                                     tenant=tenant)
 
+    def _get_with_accept(self, path, params=None, user=DEFAULT_USER,
+                         tenant=DEFAULT_TENANT,
+                         accept='application/octet-stream'):
+        req = self._simple_request(path, params=params, user=user,
+                                   tenant=tenant)
+        req.accept = accept
+        return req
+
     def _delete(self, path, params=None, user=DEFAULT_USER,
                 tenant=DEFAULT_TENANT):
         params = params or {}

murano/tests/unit/api/v1/test_catalog.py

@@ -257,6 +257,39 @@ class TestCatalogApi(test_base.ControllerTest, test_base.MuranoApiTestCase):
 
         self.assertEqual(imghdr.what('', result), 'png')
 
+    def test_download_package(self):
+        self._set_policy_rules(
+            {'download_package': '@'}
+        )
+        package_from_dir, package = self._test_package()
+
+        saved_package = db_catalog_api.package_upload(package, '')
+
+        self.expect_policy_check('download_package',
+                                 {'package_id': saved_package.id})
+
+        req = self._get_with_accept('/catalog/packages/%s/download'
+                                    % saved_package.id,
+                                    accept='application/octet-stream')
+
+        result = req.get_response(self.api)
+
+        self.assertEqual(200, result.status_code)
+
+    def test_download_package_negative(self):
+
+        package_from_dir, package = self._test_package()
+
+        saved_package = db_catalog_api.package_upload(package, '')
+
+        req = self._get_with_accept('/catalog/packages/%s/download'
+                                    % saved_package.id,
+                                    accept='application/foo')
+
+        result = req.get_response(self.api)
+
+        self.assertEqual(415, result.status_code)
+
     def test_add_public_unauthorized(self):
         self._set_policy_rules({
             'upload_package': '@',