Oauth OIDC CCloud producer example (#1769)

Added an example for OAUTH OIDC producer with support for confluent cloud

---------

Co-authored-by: Sarwar Bhuiyan <[email protected]>

Author: pranavrth

CHANGELOG.md

@@ -1,5 +1,16 @@
 # Confluent's Python client for Apache Kafka
 
+## v2.6.1
+
+v2.6.1 is a maintenance release with the following fixes and enhancements:
+
+ - Added an example for OAUTH OIDC producer with support for confluent cloud (#1769, @sarwarbhuiyan)
+
+confluent-kafka-python is based on librdkafka v2.6.1, see the
+[librdkafka release notes](https://github.com/confluentinc/librdkafka/releases/tag/v2.6.1)
+for a complete list of changes, enhancements, fixes and upgrade considerations.
+
+
 ## v2.6.0
 
 v2.6.0 is a feature release with the following features, fixes and enhancements:

examples/oauth_oidc_ccloud_producer.py

@@ -0,0 +1,128 @@
+#!/usr/bin/env python
+# -*- coding: utf-8 -*-
+#
+# Copyright 2020 Confluent Inc.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+# http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+
+# This uses OAuth client credentials grant:
+# https://www.oauth.com/oauth2-servers/access-tokens/client-credentials/
+# where client_id and client_secret are passed as HTTP Authorization header
+# with the OIDC method and doesn't need to set a `oauth_cb` to obtain the token,
+# but, given it's using cURL for http requests, when using bundled librdkafka on non RHEL based distros,
+# currently it needs to provide CA bundle at a specific path, that is `/etc/pki/tls/certs/ca-bundle.crt`.
+
+import logging
+import argparse
+from confluent_kafka import Producer
+from confluent_kafka.serialization import StringSerializer
+
+
+def producer_config(args):
+    logger = logging.getLogger(__name__)
+    logger.setLevel(logging.DEBUG)
+    params = {
+        'bootstrap.servers': args.bootstrap_servers,
+        'security.protocol': 'SASL_SSL',
+        'sasl.mechanisms': 'OAUTHBEARER',
+        'sasl.oauthbearer.method': 'oidc',
+        'sasl.oauthbearer.client.id': args.client_id,
+        'sasl.oauthbearer.client.secret': args.client_secret,
+        'sasl.oauthbearer.token.endpoint.url': args.token_url,
+        'sasl.oauthbearer.scope': ' '.join(args.scopes)
+    }
+    # These two parameters are only applicable when producing to
+    # confluent cloud where some sasl extensions are required.
+    if args.logical_cluster and args.identity_pool_id:
+        params['sasl.oauthbearer.extensions'] = 'logicalCluster=' + args.logical_cluster + \
+                            ',identityPoolId=' + args.identity_pool_id
+
+    return params
+
+
+def delivery_report(err, msg):
+    """
+    Reports the failure or success of a message delivery.
+
+    Args:
+        err (KafkaError): The error that occurred on None on success.
+
+        msg (Message): The message that was produced or failed.
+
+    Note:
+        In the delivery report callback the Message.key() and Message.value()
+        will be the binary format as encoded by any configured Serializers and
+        not the same object that was passed to produce().
+        If you wish to pass the original object(s) for key and value to delivery
+        report callback we recommend a bound callback or lambda where you pass
+        the objects along.
+
+    """
+    if err is not None:
+        print('Delivery failed for User record {}: {}'.format(msg.key(), err))
+        return
+    print('User record {} successfully produced to {} [{}] at offset {}'.format(
+        msg.key(), msg.topic(), msg.partition(), msg.offset()))
+
+
+def main(args):
+    topic = args.topic
+    delimiter = args.delimiter
+    producer_conf = producer_config(args)
+    producer = Producer(producer_conf)
+    serializer = StringSerializer('utf_8')
+
+    print('Producing records to topic {}. ^C to exit.'.format(topic))
+    while True:
+        # Serve on_delivery callbacks from previous calls to produce()
+        producer.poll(0.0)
+        try:
+            msg_data = input(">")
+            msg = msg_data.split(delimiter)
+            if len(msg) == 2:
+                producer.produce(topic=topic,
+                                 key=serializer(msg[0]),
+                                 value=serializer(msg[1]),
+                                 on_delivery=delivery_report)
+            else:
+                producer.produce(topic=topic,
+                                 value=serializer(msg[0]),
+                                 on_delivery=delivery_report)
+        except KeyboardInterrupt:
+            break
+
+    print('\nFlushing {} records...'.format(len(producer)))
+    producer.flush()
+
+
+if __name__ == '__main__':
+    parser = argparse.ArgumentParser(description="OAUTH example with client credentials grant")
+    parser.add_argument('-b', dest="bootstrap_servers", required=True,
+                        help="Bootstrap broker(s) (host[:port])")
+    parser.add_argument('-t', dest="topic", default="example_producer_oauth",
+                        help="Topic name")
+    parser.add_argument('-d', dest="delimiter", default="|",
+                        help="Key-Value delimiter. Defaults to '|'"),
+    parser.add_argument('--client', dest="client_id", required=True,
+                        help="Client ID for client credentials flow")
+    parser.add_argument('--secret', dest="client_secret", required=True,
+                        help="Client secret for client credentials flow.")
+    parser.add_argument('--token-url', dest="token_url", required=True,
+                        help="Token URL.")
+    parser.add_argument('--scopes', dest="scopes", required=True, nargs='+',
+                        help="Scopes requested from OAuth server.")
+    parser.add_argument('--logical-cluster', dest="logical_cluster", required=False, help="Logical Cluster.")
+    parser.add_argument('--identity-pool-id', dest="identity_pool_id", required=False, help="Identity Pool ID.")
+
+    main(parser.parse_args())