Merge pull request #4 from githubofkrishnadhas/feature/instalation-token

finishing github app installtion token

Author: githubofkrishnadhas

.dockerignore

@@ -1,3 +1,4 @@
 LICENSE
 README.md
 .gitignore
+

Pipfile

@@ -4,9 +4,12 @@ verify_ssl = true
 name = "pypi"
 
 [packages]
-jwt = "==1.3.1"
 requests = "==2.32.2"
+jwt = "==1.3.1"
+cryptography = "==42.0.5"
 
+[dev-packages]
+python-dotenv = "==1.0.1"
 
 [requires]
-python_version = "3"
+python_version = "3"

Pipfile.lock

@@ -1,2 +1,7 @@
 # github-access-using-githubapp
 github-access-using-githubapp
+
+
+# Reference
+
+[generating-an-installation-access-token](https://docs.github.com/en/apps/creating-github-apps/authenticating-with-a-github-app/generating-an-installation-access-token-for-a-github-app#generating-an-installation-access-token)

README.md

@@ -2,7 +2,8 @@
 import time
 import argparse
 import os
-
+import requests
+from dotenv import load_dotenv
 
 def create_jwt(private_key, app_id):
     """
@@ -12,7 +13,7 @@ def create_jwt(private_key, app_id):
     :return:
     """
     # Open PEM
-    # with open(pem_path, 'rb') as pem_file:
+    # with open(private_key, 'rb') as pem_file:
     #     signing_key = jwk_from_pem(pem_file.read())
     signing_key = jwk_from_pem(private_key.encode('utf-8'))
 
@@ -30,27 +31,82 @@ def create_jwt(private_key, app_id):
     encoded_jwt = jwt_instance.encode(payload, signing_key, alg='RS256')
 
     # Set JWT as environment variable
-    os.environ["GITHUB_JWT"] = encoded_jwt
+    # os.environ["GITHUB_JWT"] = encoded_jwt
 
-    print(f"JWT set as environment variable: JWT={encoded_jwt}")
+    # print(f"JWT token created successfully")
     return encoded_jwt
 
+def get_app_installation_id(jwt:str, github_account_type:str):
+    """
+    returns github app installation id on user and org accounts
+    :param jwt:
+    :return:
+    """
+    GITHUB_REPOSITORY = os.getenv('GITHUB_REPOSITORY')
+    GITHUB_REPOSITORY_OWNER =  os.getenv('GITHUB_REPOSITORY_OWNER')
+    org_url = f'https://api.github.com/repos/{GITHUB_REPOSITORY}/installation'
+    user_url = f'https://api.github.com/users/{GITHUB_REPOSITORY_OWNER}/installation'
+    if github_account_type == 'user':
+        url = user_url
+    else:
+        url = org_url
+    headers = {
+        "Accept": "application/vnd.github+json",
+        "Authorization": f"Bearer {jwt}",
+        "X-GitHub-Api-Version": "2022-11-28"
+    }
+    response = requests.get(url= url, headers=headers)
+
+    if response.status_code == 200:
+        print(f'Okay. Received proper response.Got installation id')
+        response_json = response.json()
+    elif response.status_code == 301:
+        print(f'Moved permanently. Cant get a response')
+    else:
+        print(f'Resource Not Found!')
+
+    # Installation id of github app
+    installation_id = response_json['id']
+    return installation_id
+
+def generate_token_by_post_call(installation_id:int, jwt:str):
+    """
+    create a app installation token by doing a rest api post call with permissions for application
+    :return:
+    """
+    url = f'https://api.github.com/app/installations/{installation_id}/access_tokens'
+    headers = {
+        "Accept": "application/vnd.github+json",
+        "Authorization": f"Bearer {jwt}",
+        "X-GitHub-Api-Version": "2022-11-28"
+    }
+    response = requests.post(url=url, headers=headers)
+    response_json = response.json()
+    if response.status_code == 201:
+        print(f'Github app installation token generate succcessfully, expires at {response_json["expires_at"]}')
+    os.environ['GH_TOKEN'] = response_json['token']
 
 def main():
     """
     to test the code
     :return:
     """
+    load_dotenv()
     parser = argparse.ArgumentParser(description="Create JWT for GitHub App authentication")
     parser.add_argument("--github_app_private_key",required=True, type=str, help="Github App Private key")
+    parser.add_argument("--github_account_type",required=True, choices=['user','organization'], help="Github account whether user account ot github org")
     parser.add_argument("--github_app_id",required=True, type=str, help="Your GitHub App ID")
     args = parser.parse_args()
 
     private_key = args.github_app_private_key
     app_id = args.github_app_id
+    github_account_type = args.github_account_type
 
     # function call
-    create_jwt(private_key, app_id)
+    jwt = create_jwt(private_key=private_key, app_id=app_id)
+    installation_id = get_app_installation_id(jwt=jwt, github_account_type=github_account_type)
+    generate_token_by_post_call(installation_id=installation_id, jwt=jwt)
+
 
 if __name__ == "__main__":
     main()