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<p>This module is used to support the Pulsar client authentication plugin for OAuth 2.0. After communicating with the Oauth 2.0 server, the Pulsar client gets an <code>access token</code> from the Oauth 2.0 server, and passes this <code>access token</code> to the Pulsar broker to do the authentication. The broker can use the <code>org.apache.pulsar.broker.authentication.AuthenticationProviderToken</code>. Or, you can add your own <code>AuthenticationProvider</code> to make it with this module.</p>
<h2><a class="anchor" aria-hidden="true" id="authentication-provider-configuration"></a><a href="#authentication-provider-configuration" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Authentication provider configuration</h2>
<p>This library allows you to authenticate the Pulsar client by using an access token that is obtained from an OAuth 2.0 authorization service, which acts as a <em>token issuer</em>.</p>
<h3><a class="anchor" aria-hidden="true" id="authentication-types"></a><a href="#authentication-types" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Authentication types</h3>
<p>The authentication type determines how to obtain an access token through an OAuth 2.0 authorization flow.</p>
<h4><a class="anchor" aria-hidden="true" id="note"></a><a href="#note" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Note</h4>
<blockquote>
<p>Currently, the Pulsar Java client only supports the <code>client_credentials</code> authentication type .</p>
</blockquote>
<h4><a class="anchor" aria-hidden="true" id="client-credentials"></a><a href="#client-credentials" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Client credentials</h4>
<p>The following table lists parameters supported for the <code>client credentials</code> authentication type.</p>
<table>
<thead>
<tr><th>Parameter</th><th>Description</th><th>Example</th><th>Required or not</th></tr>
</thead>
<tbody>
<tr><td><code>type</code></td><td>Oauth 2.0 authentication type.</td><td><code>client_credentials</code> (default)</td><td>Optional</td></tr>
<tr><td><code>issuerUrl</code></td><td>URL of the authentication provider which allows the Pulsar client to obtain an access token</td><td><code>https://accounts.google.com</code></td><td>Required</td></tr>
<tr><td><code>privateKey</code></td><td>URL to a JSON credentials file</td><td>Support the following pattern formats: <br> <li> <code>file:///path/to/file</code> <li><code>file:/path/to/file</code> <li> <code>data:application/json;base64,&lt;base64-encoded value&gt;</code></td><td>Required</td></tr>
<tr><td><code>audience</code></td><td>An OAuth 2.0 &quot;resource server&quot; identifier for the Pulsar cluster</td><td><code>https://broker.example.com</code></td><td>Required</td></tr>
</tbody>
</table>
<p>The credentials file contains service account credentials used with the client authentication type. The following shows an example of a credentials file <code>credentials_file.json</code>.</p>
<pre><code class="hljs css language-json">{
  <span class="hljs-attr">"type"</span>: <span class="hljs-string">"client_credentials"</span>,
  <span class="hljs-attr">"client_id"</span>: <span class="hljs-string">"d9ZyX97q1ef8Cr81WHVC4hFQ64vSlDK3"</span>,
  <span class="hljs-attr">"client_secret"</span>: <span class="hljs-string">"on1uJ...k6F6R"</span>,
  <span class="hljs-attr">"client_email"</span>: <span class="hljs-string">"1234567890-abcdefghijklmnopqrstuvwxyz@developer.gserviceaccount.com"</span>,
  <span class="hljs-attr">"issuer_url"</span>: <span class="hljs-string">"https://accounts.google.com"</span>
}
</code></pre>
<p>In the above example, the authentication type is set to <code>client_credentials</code> by default. And the fields &quot;client_id&quot; and &quot;client_secret&quot; are required.</p>
<h3><a class="anchor" aria-hidden="true" id="typical-original-oauth2-request-mapping"></a><a href="#typical-original-oauth2-request-mapping" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Typical original Oauth2 request mapping</h3>
<p>The following shows a typical original Oauth2 request, which is used to obtain the access token from the Oauth2 server.</p>
<pre><code class="hljs css language-bash">curl --request POST \
  --url https://dev-kt-aa9ne.us.auth0.com/oauth/token \
  --header <span class="hljs-string">'content-type: application/json'</span> \
  --data <span class="hljs-string">'{
  "client_id":"Xd23RHsUnvUlP7wchjNYOaIfazgeHd9x",
  "client_secret":"rT7ps7WY8uhdVuBTKWZkttwLdQotmdEliaM5rLfmgNibvqziZ-g07ZH52N_poGAb",
  "audience":"https://dev-kt-aa9ne.us.auth0.com/api/v2/",
  "grant_type":"client_credentials"}'</span>
</code></pre>
<p>In the above example, the mapping relationship is shown as below.</p>
<ul>
<li>The <code>issuerUrl</code> parameter in this plugin is mapped to <code>--url https://dev-kt-aa9ne.us.auth0.com/oauth/token</code>.</li>
<li>The <code>privateKey</code> file parameter in this plugin should at least contains the <code>client_id</code> and <code>client_secret</code> fields.</li>
<li>The <code>audience</code> parameter in this plugin is mapped to  <code>&quot;audience&quot;:&quot;https://dev-kt-aa9ne.us.auth0.com/api/v2/&quot;</code>.</li>
</ul>
<h2><a class="anchor" aria-hidden="true" id="client-configuration"></a><a href="#client-configuration" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Client Configuration</h2>
<p>You can use the Oauth2 authentication provider with the following Pulsar clients.</p>
<h3><a class="anchor" aria-hidden="true" id="java"></a><a href="#java" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Java</h3>
<p>You can use the factory method to configure authentication for Pulsar Java client.</p>
<pre><code class="hljs css language-java">String issuerUrl = <span class="hljs-string">"https://dev-kt-aa9ne.us.auth0.com/oauth/token"</span>;
String credentialsUrl = <span class="hljs-string">"file:///path/to/KeyFile.json"</span>;
String audience = <span class="hljs-string">"https://dev-kt-aa9ne.us.auth0.com/api/v2/"</span>;

PulsarClient client = PulsarClient.builder()
    .serviceUrl(<span class="hljs-string">"pulsar://broker.example.com:6650/"</span>)
    .authentication(
        AuthenticationFactoryOAuth2.clientCredentials(issuerUrl, credentialsUrl, audience))
    .build();
</code></pre>
<p>In addition, you can also use the encoded parameters to configure authentication for Pulsar Java client.</p>
<pre><code class="hljs css language-java">Authentication auth = AuthenticationFactory
    .create(AuthenticationOAuth2.class.getName(), "{"type":"client_credentials","privateKey":"./key/path/..","issuerUrl":"...","audience":"..."}");
PulsarClient client = PulsarClient.builder()
    .serviceUrl("pulsar://broker.example.com:6650/")
    .authentication(auth)
    .build();
</code></pre>
<h3><a class="anchor" aria-hidden="true" id="c-client"></a><a href="#c-client" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>C++ client</h3>
<p>The C++ client is similar to the Java client. You need to provide parameters of <code>issuerUrl</code>, <code>private_key</code> (the credentials file path), and the audience.</p>
<pre><code class="hljs css language-c++"><span class="hljs-meta">#<span class="hljs-meta-keyword">include</span> <span class="hljs-meta-string">&lt;pulsar/Client.h&gt;</span></span>

pulsar::ClientConfiguration <span class="hljs-built_in">config</span>;
<span class="hljs-built_in">std</span>::<span class="hljs-built_in">string</span> params = <span class="hljs-string">R"({
    "issuer_url": "https://dev-kt-aa9ne.us.auth0.com/oauth/token",
    "private_key": "../../pulsar-broker/src/test/resources/authentication/token/cpp_credentials_file.json",
    "audience": "https://dev-kt-aa9ne.us.auth0.com/api/v2/"})"</span>;
    
<span class="hljs-built_in">config</span>.setAuth(pulsar::AuthOauth2::create(params));

<span class="hljs-function">pulsar::<span class="hljs-built_in">Client</span> <span class="hljs-title">client</span><span class="hljs-params">(<span class="hljs-string">"pulsar://broker.example.com:6650/"</span>, <span class="hljs-built_in">config</span>)</span></span>;
</code></pre>
<h3><a class="anchor" aria-hidden="true" id="go-client"></a><a href="#go-client" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Go client</h3>
<p>To enable OAuth2 authentication in Go client, you need to configure OAuth2 authentication.
This example shows how to configure OAuth2 authentication in Go client.</p>
<pre><code class="hljs css language-go">oauth := pulsar.NewAuthenticationOAuth2(<span class="hljs-keyword">map</span>[<span class="hljs-keyword">string</span>]<span class="hljs-keyword">string</span>{
        <span class="hljs-string">"type"</span>:       <span class="hljs-string">"client_credentials"</span>,
        <span class="hljs-string">"issuerUrl"</span>:  <span class="hljs-string">"https://dev-kt-aa9ne.us.auth0.com/oauth/token"</span>,
        <span class="hljs-string">"audience"</span>:   <span class="hljs-string">"https://dev-kt-aa9ne.us.auth0.com/api/v2/"</span>,
        <span class="hljs-string">"privateKey"</span>: <span class="hljs-string">"/path/to/privateKey"</span>,
        <span class="hljs-string">"clientId"</span>:   <span class="hljs-string">"0Xx...Yyxeny"</span>,
    })
client, err := pulsar.NewClient(pulsar.ClientOptions{
        URL:              <span class="hljs-string">"puslar://my-cluster:6650"</span>,
        Authentication:   oauth,
})
</code></pre>
<h3><a class="anchor" aria-hidden="true" id="python-client"></a><a href="#python-client" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Python client</h3>
<p>To enable OAuth2 authentication in Python client, you need to configure OAuth2 authentication.
This example shows how to configure OAuth2 authentication in Python client.</p>
<pre><code class="hljs css language-python"><span class="hljs-keyword">from</span> pulsar <span class="hljs-keyword">import</span> Client, AuthenticationOauth2

params = <span class="hljs-string">'''
{
    "issuer_url": "https://dev-kt-aa9ne.us.auth0.com",
    "private_key": "/path/to/privateKey",
    "audience": "https://dev-kt-aa9ne.us.auth0.com/api/v2/"
}
'''</span>

client = Client(<span class="hljs-string">"puslar://my-cluster:6650"</span>, authentication=AuthenticationOauth2(params))
</code></pre>
</span></div></article></div><div class="docs-prevnext"><a class="docs-prev button" href="/docs/en/2.6.4/security-kerberos"><span class="arrow-prev">← </span><span>Authentication using Kerberos</span></a><a class="docs-next button" href="/docs/en/2.6.4/security-authorization"><span>Authorization and ACLs</span><span class="arrow-next"> →</span></a></div></div></div><nav class="onPageNav"><ul class="toc-headings"><li><a href="#authentication-provider-configuration">Authentication provider configuration</a><ul class="toc-headings"><li><a href="#authentication-types">Authentication types</a></li><li><a href="#typical-original-oauth2-request-mapping">Typical original Oauth2 request mapping</a></li></ul></li><li><a href="#client-configuration">Client Configuration</a><ul class="toc-headings"><li><a href="#java">Java</a></li><li><a href="#c-client">C++ client</a></li><li><a href="#go-client">Go client</a></li><li><a href="#python-client">Python client</a></li></ul></li></ul></nav></div><footer class="nav-footer" id="footer"><section class="copyright">Copyright © 2022 The Apache Software Foundation. All Rights Reserved. Apache, Apache Pulsar and the Apache feather logo are trademarks of The Apache Software Foundation.</section><span><script>
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