Repository endpoint tags pagination (#3238)

* endpoint/api/repository: limit the number of tags returned

- Limit the number of tags returned by /api/v1/repository/<ns:repo> to 500.
- Uses the tag history endpoint instead, with an active tag filte.
- Update UI to use tag history endpoint instead.

endpoints/api/tag.py

@@ -7,7 +7,8 @@ from auth.auth_context import get_authenticated_user
 from data.registry_model import registry_model
 from endpoints.api import (resource, nickname, require_repo_read, require_repo_write,
                            RepositoryParamResource, log_action, validate_json_request, path_param,
-                           parse_args, query_param, truthy_bool, disallow_for_app_repositories)
+                           parse_args, query_param, truthy_bool, disallow_for_app_repositories,
+                           format_date)
 from endpoints.api.image import image_dict
 from endpoints.exception import NotFound, InvalidRequest
 from util.names import TAG_ERROR, TAG_REGEX
@@ -30,6 +31,16 @@ def _tag_dict(tag):
 
   if tag.legacy_image:
     tag_info['docker_image_id'] = tag.legacy_image.docker_image_id
+    tag_info['image_id'] = tag.legacy_image.docker_image_id
+    tag_info['size'] = tag.legacy_image.aggregate_size
+
+  if tag.lifetime_start_ts > 0:
+    last_modified = format_date(datetime.fromtimestamp(tag.lifetime_start_ts))
+    tag_info['last_modified'] = last_modified
+
+  if tag.lifetime_end_ts is not None:
+    expiration = format_date(datetime.fromtimestamp(tag.lifetime_end_ts))
+    tag_info['expiration'] = expiration
 
   return tag_info
 
@@ -46,11 +57,13 @@ class ListRepositoryTags(RepositoryParamResource):
   @query_param('limit', 'Limit to the number of results to return per page. Max 100.', type=int,
                default=50)
   @query_param('page', 'Page index for the results. Default 1.', type=int, default=1)
+  @query_param('onlyActiveTags', 'Filter to only active tags.', type=truthy_bool, default=False)
   @nickname('listRepoTags')
   def get(self, namespace, repository, parsed_args):
     specific_tag = parsed_args.get('specificTag') or None
     page = max(1, parsed_args.get('page', 1))
     limit = min(100, max(1, parsed_args.get('limit', 50)))
+    active_tags_only = parsed_args.get('onlyActiveTags')
 
     repo_ref = registry_model.lookup_repository(namespace, repository)
     if repo_ref is None:
@@ -58,7 +71,8 @@ class ListRepositoryTags(RepositoryParamResource):
 
     history, has_more = registry_model.list_repository_tag_history(repo_ref, page=page,
                                                                    size=limit,
-                                                                   specific_tag_name=specific_tag)
+                                                                   specific_tag_name=specific_tag,
+                                                                   active_tags_only=active_tags_only)
     return {
       'tags': [_tag_dict(tag) for tag in history],
       'page': page,