Adding examples and pushing client token manager and cred provider

README.md

@@ -86,6 +86,13 @@ After a brief delay, you will receive the text message on your phone.
 > **Warning**
 > It's okay to hardcode your credentials when testing locally, but you should use environment variables to keep them secret before committing any code or deploying to production. Check out [How to Set Environment Variables](https://www.twilio.com/blog/2017/01/how-to-set-environment-variables.html) for more information.
 
+## OAuth Feature for Twilio APIs
+We are introducing Client Credentials Flow-based OAuth 2.0 authentication. This feature is currently in beta and its implementation is subject to change.
+
+API examples [here](https://github.com/twilio/twilio-python/blob/main/examples/public_oauth.py)
+
+Organisation API examples [here](https://github.com/twilio/twilio-python/blob/main/examples/organization_api_calls.py)
+
 ## Use the helper library
 
 ### API Credentials

examples/organization_api_calls.py

@@ -0,0 +1,28 @@
+import os
+
+from twilio.rest import Client
+from twilio.credential.orgs_credential_provider import OrgsCredentialProvider
+
+API_KEY = os.environ.get("TWILIO_API_KEY")
+API_SECRET = os.environ.get("TWILIO_API_SECRET")
+ACCOUNT_SID = os.environ.get("TWILIO_ACCOUNT_SID")
+CLIENT_ID = os.environ.get("TWILIO_CLIENT_ID")
+CLIENT_SECRET = os.environ.get("TWILIO_CLIENT_SECRET")
+ORGS_SID = os.environ.get("TWILIO_ORGS_SID")
+
+
+def example(self=None):
+    """
+    Some example usage of fetching accounts within an organization
+    """
+    self.client = Client(
+        username=API_KEY,
+        password=API_SECRET,
+        account_sid=ACCOUNT_SID,
+        credential_provider= OrgsCredentialProvider(CLIENT_ID, CLIENT_SECRET)
+    )
+    accounts = self.client.preview_iam.organization(organization_sid=ORGS_SID).accounts.stream()
+    self.assertIsNotNone(accounts)
+
+if __name__ == "__main__":
+    example()

examples/public_oauth.py

@@ -0,0 +1,35 @@
+import os
+
+from twilio.rest import Client
+from twilio.credential.client_credential_provider import ClientCredentialProvider
+
+API_KEY = os.environ.get("TWILIO_API_KEY")
+API_SECRET = os.environ.get("TWILIO_API_SECRET")
+ACCOUNT_SID = os.environ.get("TWILIO_ACCOUNT_SID")
+CLIENT_ID = os.environ.get("TWILIO_CLIENT_ID")
+CLIENT_SECRET = os.environ.get("TWILIO_CLIENT_SECRET")
+ORGS_SID = os.environ.get("TWILIO_ORGS_SID")
+FROM_NUMBER = os.environ.get("TWILIO_FROM_NUMBER")
+TO_NUMBER = os.environ.get("TWILIO_TO_NUMBER")
+
+
+def example(self=None):
+    """
+    Some example usage of fetching accounts within an organization
+    """
+    self.client = Client(
+        username=API_KEY,
+        password=API_SECRET,
+        account_sid=ACCOUNT_SID,
+        credential_provider= ClientCredentialProvider(CLIENT_ID, CLIENT_SECRET)
+    )
+    msg = self.client.messages.create(
+        to=self.to_number, from_=self.from_number, body="hello world"
+    )
+    self.assertEqual(msg.to, self.to_number)
+    self.assertEqual(msg.from_, self.from_number)
+    self.assertEqual(msg.body, "hello world")
+    self.assertIsNotNone(msg.sid)
+
+if __name__ == "__main__":
+    example()

twilio/credential/client_credential_provider.py

@@ -0,0 +1,28 @@
+from twilio.http.orgs_token_manager import OrgTokenManager
+from twilio.base.exceptions import TwilioException
+from twilio.credential.credential_provider import CredentialProvider
+from twilio.auth_strategy.auth_type import AuthType
+from twilio.auth_strategy.token_auth_strategy import TokenAuthStrategy
+
+
+class ClientCredentialProvider(CredentialProvider):
+    def __init__(self, client_id: str, client_secret: str, token_manager=None):
+        super().__init__(AuthType.CLIENT_CREDENTIALS)
+
+        if client_id is None or client_secret is None:
+            raise TwilioException("Client id and Client secret are mandatory")
+
+        self.grant_type = "client_credentials"
+        self.client_id = client_id
+        self.client_secret = client_secret
+        self.token_manager = token_manager
+        self.auth_strategy = None
+
+    def to_auth_strategy(self):
+        if self.token_manager is None:
+            self.token_manager = OrgTokenManager(
+                self.grant_type, self.client_id, self.client_secret
+            )
+        if self.auth_strategy is None:
+            self.auth_strategy = TokenAuthStrategy(self.token_manager)
+        return self.auth_strategy

twilio/http/client_token_manager.py

@@ -0,0 +1,41 @@
+from twilio.http.token_manager import TokenManager
+from twilio.rest import Client
+
+
+class ClientTokenManager(TokenManager):
+    """
+    Client Token Manager
+    """
+
+    def __init__(
+        self,
+        grant_type: str,
+        client_id: str,
+        client_secret: str,
+        code: str = None,
+        redirect_uri: str = None,
+        audience: str = None,
+        refreshToken: str = None,
+        scope: str = None,
+    ):
+        self.grant_type = grant_type
+        self.client_id = client_id
+        self.client_secret = client_secret
+        self.code = code
+        self.redirect_uri = redirect_uri
+        self.audience = audience
+        self.refreshToken = refreshToken
+        self.scope = scope
+        self.client = Client()
+
+    def fetch_access_token(self):
+        token_instance = self.client.preview_iam.v1.token.create(
+            grant_type=self.grant_type,
+            client_id=self.client_id,
+            client_secret=self.client_secret,
+            code=self.code,
+            redirect_uri=self.redirect_uri,
+            audience=self.audience,
+            scope=self.scope,
+        )
+        return token_instance.access_token