Add 'GitHubUtils' class

scar/utils.py

@@ -12,8 +12,10 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
+from typing import Optional
 from distutils import dir_util
 import scar.logger as logger
+import scar.http.request as request
 import base64
 import json
 import os
@@ -220,3 +222,46 @@ def get_storage_provider_id(storage_provider, env_vars):
  if env_key.startswith("STORAGE_AUTH_{}".format(storage_provider)):
  return "_".join(env_key.split("_")[3:-1])
 
+class GitHubUtils():
+ """Common methods for GitHub API Queries.
+ https://developer.github.com/v3/repos/releases/"""
+
+ @staticmethod
+ def get_latest_release(user: str, project: str) -> Optional[str]:
+ """Get the tag of the latest release in a repository"""
+ url = f'https://api.github.com/repos/{user}/{project}/releases/latest'
+ response = json.loads(request.get_file(url))
+ if is_value_in_dict(response, 'tag_name'):
+ return response['tag_name']
+ return None
+
+ @staticmethod
+ def exists_release_in_repo(user: str, project: str, tag_name: str) -> bool:
+ """Check if a tagged release exists in a repository"""
+ url = f'https://api.github.com/repos/{user}/{project}/releases'
+ response = json.loads(request.get_file(url))
+ if response and response is list:
+ for release in response:
+ if release['tag_name'] == tag_name:
+ return True
+ else:
+ return False
+
+ @staticmethod
+ def get_asset_url(user: str, project: str, asset_name: str, tag_name: str = 'latest') -> Optional[str]:
+ """Get the download asset url from the specified github tagged project"""
+ if tag_name == 'latest':
+ url = f'https://api.github.com/repos/{user}/{project}/releases/latest'
+ else:
+ if GitHubUtils.exists_release_in_repo(user, project, tag_name):
+ url = f'https://api.github.com/repos/{user}/{project}/releases/tags/{tag_name}'
+ else:
+ return None
+ response = json.loads(request.get_file(url))
+ if isinstance(response, dict) and 'assets' in response:
+ for asset in response['assets']:
+ if asset['name'] == asset_name:
+ return asset['browser_download_url']
+ return None
+
+