Merge pull request #1 from skoobasteeve/python-package

Convert to Python package

README.md

@@ -1,49 +1,62 @@
-# SuccessFactors + Python
-Authenticate with and use the SAP SuccessFactors API with Python.
+# SuccessFactors Auth
+Authenticate with the SAP SuccessFactors API with OAuth2 and Python.
 
-## Authentcation
-
-### How to use
+## How to use
 
 1. Create an OAuth application in SuccessFactors.
 2. Download the private key and copy the Client ID.
-3. Clone this repo and copy `sf_auth.py` and `sf_saml_template.xml` into your Python project directory.
-4. Import `sf_auth` into your project.
-5. Install all the requirements listed in `requirements.txt` in this repo.
-6. Call the `sf_auth.auth()` function in your Python project. You'll need to pass the following parameters:
+3. Install the Python module:
+   ``` shell
+   pip install successfactors_auth
+   ```
+4. Import `successfactors_auth` into your Python >=3.9 project.
+5. Call the `successfactors_auth.auth()` function in your Python project. You'll need to pass the following parameters:
     - `sf_url`: Base API url of your SuccessFactors instance, e.g. "https://api55.sapsf.eu".
     - `sf_company_id`: SuccessFactors company ID.
     - `sf_oauth_client_id`: The Client ID for the OAuth application you created earlier.
     - `sf_admin_user`: An admin user in SuccessFactors that has access to the OAuth application.
     - `sf_saml_private_key`: Path to the private key file you downloaded when you created the OAuth application.
-    - `template_file`: Path to the template file from this repo.
 
-    Example:
-    ``` python
-    #!/usr/bin/env python
+### Example
 
-    import requests
-    import sf_auth
+``` python
+#!/usr/bin/env python
 
-    sf_url = 'https://your.base.url.com'
-    sf_company_id = 'your-company-id'
-    sf_oauth_client_id = 'OAUTH-CLIENT-ID'
-    sf_admin_user = 'your_admin_user'
-    sf_saml_private_key = 'your_app_private_key.pem'
-    template_file = 'sf_saml_template.xml'
+import requests
+import successfactors_auth
 
-    token = sf_auth.auth(sf_url, sf_company_id, sf_oauth_client_id, sf_admin_user, sf_saml_private_key, sf_saml_template)
+sf_url = 'https://your.base.url.com'
+sf_company_id = 'your-company-id'
+sf_oauth_client_id = 'your_app_client_id'
+sf_admin_user = 'your_admin_user'
+sf_saml_private_key = 'your_app_private_key.pem'
 
-    headers = {
-        "Accept: application/json",
-        f"Authorization: {token}"
-    }
+token = successfactors_auth.auth(
+    sf_url,
+    sf_company_id,
+    sf_oauth_client_id,
+    sf_admin_user,
+    sf_saml_private_key,
+    sf_saml_template
+    )
 
-    request = requests.get(f"{sf_url}/User", headers=headers)
+headers = {
+    "Accept: application/json",
+    f"Authorization: {token}"
+}
 
-    print(request.json())
-    ```
+request = requests.get(f"{sf_url}/User", headers=headers)
+user = request.json()
 
-### Using as an AWS Lambda function w/ API Gateway
+print(user)
+```
 
-Coming soon...
+## Background
+
+I wrote this module because I was forced to deal with the *horrific* SAP SuccessFactors API at my job, and I wanted to make sure other devs/sysadmins wouldn't have to feel the pain that I felt.  
+
+Once you get authenticated, getting the information you want is a whole new level of suffering. I hope to publish some more examples in the form of a blog post or docs in this repo.
+
+## Contributing
+
+All contributions welcome! Feel free to file an [issue](https://github.com/skoobasteeve/successfactors_auth/issues) or open a [pull request](https://github.com/skoobasteeve/successfactors_auth/pulls).

pyproject.toml

@@ -4,13 +4,13 @@ build-backend = "hatchling.build"
 
 [project]
 name = "successfactors_auth"
-version = "0.0.2"
+version = "0.0.5"
 authors = [
   { name="Ray Lyon", email="ray@raylyon.net" },
 ]
 description = "Authenticate to the SuccessFactors API."
 readme = "README.md"
-requires-python = ">=3.8"
+requires-python = ">=3.9"
 classifiers = [
     "Programming Language :: Python :: 3",
     "License :: OSI Approved :: Apache Software License",
@@ -18,5 +18,5 @@ classifiers = [
 ]
 
 [project.urls]
-"Homepage" = "https://github.com/skoobasteeve/successfactors-python"
-"Bug Tracker" = "https://github.com/skoobasteeve/successfactors-python/issues"
+"Homepage" = "https://github.com/skoobasteeve/successfactors_auth"
+"Bug Tracker" = "https://github.com/skoobasteeve/successfactors_auth/issues"

src/successfactors_auth/auth.py

@@ -10,18 +10,20 @@ Bearer token.
 
 Derived from: https://github.com/mtrdesign/python-saml-example
 
-This script requires the following additional files:
+This module requires the following additional files:
 -Private key file for a previously created SuccessFactors OAuth2 application
 
 Required packages:
-pip install requests lxml xmlsec
+requests
+lxml
+xmlsec
 
 Example:
 #!/usr/bin/env python3
 
-import sf_auth
+import successfactors_auth
 
-token = sf_auth.auth(
+token = successfactors_auth.auth(
             SF_URL,
             SF_COMPANY_ID,
             SF_OAUTH_CLIENT_ID,
@@ -31,17 +33,21 @@ token = sf_auth.auth(
 '''
 
 import base64
+from datetime import datetime, timedelta
+from importlib import resources as impresources
 import requests
 import xmlsec
-import importlib.resources
 from lxml import etree
-from datetime import datetime, timedelta
+
+from . import templates
 
 
-# Send POST request to SuccessFactors containing the generated
-# SAML assertion and other details, then receive a token in response
-def get_access_token(sf_url, company_id, client_id, assertion):
-
+def get_access_token(sf_url: str, company_id: str, client_id: str,
+                     assertion: str) -> str:
+    """
+    Send POST request to SuccessFactors containing the generated
+    SAML assertion and other details, then receive a token in response
+    """
     # Request body
     token_request = dict(
         client_id=client_id,
@@ -49,13 +55,17 @@ def get_access_token(sf_url, company_id, client_id, assertion):
         grant_type='urn:ietf:params:oauth:grant-type:saml2-bearer',
         assertion=assertion
     )
-    response = requests.post(f"{sf_url}/oauth/token", data=token_request)
+    response = requests.post(f"{sf_url}/oauth/token", data=token_request,
+                             timeout=15)
     token_data = response.json()
     return token_data['access_token']
 
 
-# Generate SAML assertion from the template XML
-def generate_assertion(sf_root_url, user_id, client_id, template_file):
+def generate_assertion(sf_root_url: str, user_id: str, client_id: str,
+                       template_file: str) -> str:
+    """
+    Generate SAML assertion from the template XML
+    """
     # Calculate valid time values for the assertion's validity
     issue_instant = datetime.utcnow()
     auth_instant = issue_instant
@@ -77,14 +87,16 @@ def generate_assertion(sf_root_url, user_id, client_id, template_file):
         session_id='mock_session_index',
     )
     # Open the template file
-    saml_template = open(template_file).read()
+    saml_template = open(template_file, encoding="utf-8").read()
 
     # Fill the values into the template and return in
     return saml_template.format(**context)
 
 
-# Sign the SAML assertion using a private key file
-def sign_assertion(xml_string, private_key):
+def sign_assertion(xml_string: str, private_key: str) -> str:
+    """
+    Sign the SAML assertion using a private key file
+    """
     # Import key file
     key = xmlsec.Key.from_file(private_key, xmlsec.KeyFormat.PEM)
 
@@ -101,10 +113,14 @@ def sign_assertion(xml_string, private_key):
     return etree.tostring(root)
 
 
-def auth(sf_url, sf_company_id, sf_oauth_client_id,
-         sf_admin_user, sf_saml_private_key):
+def auth(sf_url: str, sf_company_id: str, sf_oauth_client_id: str,
+         sf_admin_user: str, sf_saml_private_key: str) -> str:
+    """
+    Request an API access token by generating a signed SAML assertion
+    and using it to authenticate with SuccessFactors.
+    """
 
-    template_file = "sf_saml_template.xml"
+    template_file = impresources.files(templates) / 'sf_saml_template.xml'
 
     # Generate SAML assertion XML from template file
     unsigned_assertion = generate_assertion(sf_url,